Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2 | /* pngwutil.c - utilities to write a PNG file |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 3 | * |
Glenn Randers-Pehrson | 212fd57 | 2014-06-11 21:10:16 -0500 | [diff] [blame] | 4 | * Last changed in libpng 1.6.11 [June 5, 2014] |
Glenn Randers-Pehrson | 0567015 | 2014-03-08 12:39:52 -0600 | [diff] [blame] | 5 | * Copyright (c) 1998-2014 Glenn Randers-Pehrson |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
Glenn Randers-Pehrson | 3e61d79 | 2009-06-24 09:31:28 -0500 | [diff] [blame] | 8 | * |
Glenn Randers-Pehrson | bfbf865 | 2009-06-26 21:46:52 -0500 | [diff] [blame] | 9 | * This code is released under the libpng license. |
Glenn Randers-Pehrson | c332bbc | 2009-06-25 13:43:50 -0500 | [diff] [blame] | 10 | * For conditions of distribution and use, see the disclaimer |
Glenn Randers-Pehrson | 037023b | 2009-06-24 10:27:36 -0500 | [diff] [blame] | 11 | * and license in png.h |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 12 | */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 13 | |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 14 | #include "pngpriv.h" |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 15 | |
Glenn Randers-Pehrson | c3cd22b | 2010-03-08 21:10:25 -0600 | [diff] [blame] | 16 | #ifdef PNG_WRITE_SUPPORTED |
| 17 | |
Glenn Randers-Pehrson | 34713ce | 2010-04-28 07:49:28 -0500 | [diff] [blame] | 18 | #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 19 | /* Place a 32-bit number into a buffer in PNG byte order. We work |
| 20 | * with unsigned numbers for convenience, although one supported |
| 21 | * ancillary chunk uses signed (two's complement) numbers. |
| 22 | */ |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 23 | void PNGAPI |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 24 | png_save_uint_32(png_bytep buf, png_uint_32 i) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 25 | { |
| 26 | buf[0] = (png_byte)((i >> 24) & 0xff); |
| 27 | buf[1] = (png_byte)((i >> 16) & 0xff); |
| 28 | buf[2] = (png_byte)((i >> 8) & 0xff); |
| 29 | buf[3] = (png_byte)(i & 0xff); |
| 30 | } |
| 31 | |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 32 | /* Place a 16-bit number into a buffer in PNG byte order. |
| 33 | * The parameter is declared unsigned int, not png_uint_16, |
| 34 | * just to avoid potential problems on pre-ANSI C compilers. |
| 35 | */ |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 36 | void PNGAPI |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 37 | png_save_uint_16(png_bytep buf, unsigned int i) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 38 | { |
| 39 | buf[0] = (png_byte)((i >> 8) & 0xff); |
| 40 | buf[1] = (png_byte)(i & 0xff); |
| 41 | } |
Glenn Randers-Pehrson | 34713ce | 2010-04-28 07:49:28 -0500 | [diff] [blame] | 42 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 43 | |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 44 | /* Simple function to write the signature. If we have already written |
| 45 | * the magic bytes of the signature, or more likely, the PNG stream is |
| 46 | * being embedded into another stream and doesn't need its own signature, |
| 47 | * we should call png_set_sig_bytes() to tell libpng how many of the |
| 48 | * bytes have already been written. |
| 49 | */ |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 50 | void PNGAPI |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 51 | png_write_sig(png_structrp png_ptr) |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 52 | { |
| 53 | png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10}; |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 54 | |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 55 | #ifdef PNG_IO_STATE_SUPPORTED |
| 56 | /* Inform the I/O callback that the signature is being written */ |
| 57 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_SIGNATURE; |
| 58 | #endif |
| 59 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 60 | /* Write the rest of the 8 byte signature */ |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 61 | png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes], |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 62 | (png_size_t)(8 - png_ptr->sig_bytes)); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 63 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 64 | if (png_ptr->sig_bytes < 3) |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 65 | png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; |
| 66 | } |
| 67 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 68 | /* Write the start of a PNG chunk. The type is the chunk type. |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 69 | * The total_length is the sum of the lengths of all the data you will be |
| 70 | * passing in png_write_chunk_data(). |
| 71 | */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 72 | static void |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 73 | png_write_chunk_header(png_structrp png_ptr, png_uint_32 chunk_name, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 74 | png_uint_32 length) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 75 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 76 | png_byte buf[8]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 77 | |
Glenn Randers-Pehrson | 5b3b54e | 2011-10-12 06:36:56 -0500 | [diff] [blame] | 78 | #if defined(PNG_DEBUG) && (PNG_DEBUG > 0) |
Glenn Randers-Pehrson | ba55c07 | 2011-10-11 21:21:37 -0500 | [diff] [blame] | 79 | PNG_CSTRING_FROM_CHUNK(buf, chunk_name); |
| 80 | png_debug2(0, "Writing %s chunk, length = %lu", buf, (unsigned long)length); |
| 81 | #endif |
Glenn Randers-Pehrson | da00980 | 2009-08-15 13:25:47 -0500 | [diff] [blame] | 82 | |
| 83 | if (png_ptr == NULL) |
| 84 | return; |
| 85 | |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 86 | #ifdef PNG_IO_STATE_SUPPORTED |
| 87 | /* Inform the I/O callback that the chunk header is being written. |
| 88 | * PNG_IO_CHUNK_HDR requires a single I/O call. |
| 89 | */ |
| 90 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_HDR; |
| 91 | #endif |
| 92 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 93 | /* Write the length and the chunk name */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 94 | png_save_uint_32(buf, length); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 95 | png_save_uint_32(buf + 4, chunk_name); |
| 96 | png_write_data(png_ptr, buf, 8); |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 97 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 98 | /* Put the chunk name into png_ptr->chunk_name */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 99 | png_ptr->chunk_name = chunk_name; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 100 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 101 | /* Reset the crc and run it over the chunk name */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 102 | png_reset_crc(png_ptr); |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 103 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 104 | png_calculate_crc(png_ptr, buf + 4, 4); |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 105 | |
| 106 | #ifdef PNG_IO_STATE_SUPPORTED |
| 107 | /* Inform the I/O callback that chunk data will (possibly) be written. |
| 108 | * PNG_IO_CHUNK_DATA does NOT require a specific number of I/O calls. |
| 109 | */ |
| 110 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_DATA; |
| 111 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 112 | } |
| 113 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 114 | void PNGAPI |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 115 | png_write_chunk_start(png_structrp png_ptr, png_const_bytep chunk_string, |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 116 | png_uint_32 length) |
| 117 | { |
| 118 | png_write_chunk_header(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), length); |
| 119 | } |
| 120 | |
| 121 | /* Write the data of a PNG chunk started with png_write_chunk_header(). |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 122 | * Note that multiple calls to this function are allowed, and that the |
| 123 | * sum of the lengths from these calls *must* add up to the total_length |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 124 | * given to png_write_chunk_header(). |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 125 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 126 | void PNGAPI |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 127 | png_write_chunk_data(png_structrp png_ptr, png_const_bytep data, |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 128 | png_size_t length) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 129 | { |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 130 | /* Write the data, and run the CRC over it */ |
| 131 | if (png_ptr == NULL) |
| 132 | return; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 133 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 134 | if (data != NULL && length > 0) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 135 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 136 | png_write_data(png_ptr, data, length); |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 137 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 138 | /* Update the CRC after writing the data, |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 139 | * in case that the user I/O routine alters it. |
| 140 | */ |
| 141 | png_calculate_crc(png_ptr, data, length); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 142 | } |
| 143 | } |
| 144 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 145 | /* Finish a chunk started with png_write_chunk_header(). */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 146 | void PNGAPI |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 147 | png_write_chunk_end(png_structrp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 148 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 149 | png_byte buf[4]; |
| 150 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 151 | if (png_ptr == NULL) return; |
| 152 | |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 153 | #ifdef PNG_IO_STATE_SUPPORTED |
| 154 | /* Inform the I/O callback that the chunk CRC is being written. |
| 155 | * PNG_IO_CHUNK_CRC requires a single I/O function call. |
| 156 | */ |
| 157 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_CRC; |
| 158 | #endif |
| 159 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 160 | /* Write the crc in a single operation */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 161 | png_save_uint_32(buf, png_ptr->crc); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 162 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 163 | png_write_data(png_ptr, buf, (png_size_t)4); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 164 | } |
| 165 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 166 | /* Write a PNG chunk all at once. The type is an array of ASCII characters |
| 167 | * representing the chunk name. The array must be at least 4 bytes in |
| 168 | * length, and does not need to be null terminated. To be safe, pass the |
| 169 | * pre-defined chunk names here, and if you need a new one, define it |
| 170 | * where the others are defined. The length is the length of the data. |
| 171 | * All the data must be present. If that is not possible, use the |
| 172 | * png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end() |
| 173 | * functions instead. |
| 174 | */ |
| 175 | static void |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 176 | png_write_complete_chunk(png_structrp png_ptr, png_uint_32 chunk_name, |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 177 | png_const_bytep data, png_size_t length) |
| 178 | { |
| 179 | if (png_ptr == NULL) |
| 180 | return; |
| 181 | |
| 182 | /* On 64 bit architectures 'length' may not fit in a png_uint_32. */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 183 | if (length > PNG_UINT_31_MAX) |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 184 | png_error(png_ptr, "length exceeds PNG maxima"); |
| 185 | |
| 186 | png_write_chunk_header(png_ptr, chunk_name, (png_uint_32)length); |
| 187 | png_write_chunk_data(png_ptr, data, length); |
| 188 | png_write_chunk_end(png_ptr); |
| 189 | } |
| 190 | |
| 191 | /* This is the API that calls the internal function above. */ |
| 192 | void PNGAPI |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 193 | png_write_chunk(png_structrp png_ptr, png_const_bytep chunk_string, |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 194 | png_const_bytep data, png_size_t length) |
| 195 | { |
| 196 | png_write_complete_chunk(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), data, |
| 197 | length); |
| 198 | } |
| 199 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 200 | /* This is used below to find the size of an image to pass to png_deflate_claim, |
| 201 | * so it only needs to be accurate if the size is less than 16384 bytes (the |
| 202 | * point at which a lower LZ window size can be used.) |
| 203 | */ |
| 204 | static png_alloc_size_t |
| 205 | png_image_size(png_structrp png_ptr) |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 206 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 207 | /* Only return sizes up to the maximum of a png_uint_32, do this by limiting |
| 208 | * the width and height used to 15 bits. |
| 209 | */ |
| 210 | png_uint_32 h = png_ptr->height; |
| 211 | |
| 212 | if (png_ptr->rowbytes < 32768 && h < 32768) |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 213 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 214 | if (png_ptr->interlaced) |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 215 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 216 | /* Interlacing makes the image larger because of the replication of |
| 217 | * both the filter byte and the padding to a byte boundary. |
| 218 | */ |
| 219 | png_uint_32 w = png_ptr->width; |
| 220 | unsigned int pd = png_ptr->pixel_depth; |
| 221 | png_alloc_size_t cb_base; |
| 222 | int pass; |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 223 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 224 | for (cb_base=0, pass=0; pass<=6; ++pass) |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 225 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 226 | png_uint_32 pw = PNG_PASS_COLS(w, pass); |
| 227 | |
| 228 | if (pw > 0) |
| 229 | cb_base += (PNG_ROWBYTES(pd, pw)+1) * PNG_PASS_ROWS(h, pass); |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 230 | } |
| 231 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 232 | return cb_base; |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 233 | } |
| 234 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 235 | else |
| 236 | return (png_ptr->rowbytes+1) * h; |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 237 | } |
| 238 | |
| 239 | else |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 240 | return 0xffffffffU; |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 241 | } |
| 242 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 243 | #ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED |
| 244 | /* This is the code to hack the first two bytes of the deflate stream (the |
| 245 | * deflate header) to correct the windowBits value to match the actual data |
| 246 | * size. Note that the second argument is the *uncompressed* size but the |
| 247 | * first argument is the *compressed* data (and it must be deflate |
| 248 | * compressed.) |
| 249 | */ |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 250 | static void |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 251 | optimize_cmf(png_bytep data, png_alloc_size_t data_size) |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 252 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 253 | /* Optimize the CMF field in the zlib stream. The resultant zlib stream is |
| 254 | * still compliant to the stream specification. |
| 255 | */ |
| 256 | if (data_size <= 16384) /* else windowBits must be 15 */ |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 257 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 258 | unsigned int z_cmf = data[0]; /* zlib compression method and flags */ |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 259 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 260 | if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70) |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 261 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 262 | unsigned int z_cinfo; |
| 263 | unsigned int half_z_window_size; |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 264 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 265 | z_cinfo = z_cmf >> 4; |
| 266 | half_z_window_size = 1U << (z_cinfo + 7); |
| 267 | |
| 268 | if (data_size <= half_z_window_size) /* else no change */ |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 269 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 270 | unsigned int tmp; |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 271 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 272 | do |
| 273 | { |
| 274 | half_z_window_size >>= 1; |
| 275 | --z_cinfo; |
| 276 | } |
| 277 | while (z_cinfo > 0 && data_size <= half_z_window_size); |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 278 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 279 | z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4); |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 280 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 281 | data[0] = (png_byte)z_cmf; |
| 282 | tmp = data[1] & 0xe0; |
| 283 | tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f; |
| 284 | data[1] = (png_byte)tmp; |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 285 | } |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 286 | } |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 287 | } |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 288 | } |
| 289 | #else |
| 290 | # define optimize_cmf(dp,dl) ((void)0) |
| 291 | #endif /* PNG_WRITE_OPTIMIZE_CMF_SUPPORTED */ |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 292 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 293 | /* Initialize the compressor for the appropriate type of compression. */ |
| 294 | static int |
| 295 | png_deflate_claim(png_structrp png_ptr, png_uint_32 owner, |
| 296 | png_alloc_size_t data_size) |
| 297 | { |
| 298 | if (png_ptr->zowner != 0) |
| 299 | { |
| 300 | char msg[64]; |
| 301 | |
| 302 | PNG_STRING_FROM_CHUNK(msg, owner); |
| 303 | msg[4] = ':'; |
| 304 | msg[5] = ' '; |
| 305 | PNG_STRING_FROM_CHUNK(msg+6, png_ptr->zowner); |
| 306 | /* So the message that results is "<chunk> using zstream"; this is an |
| 307 | * internal error, but is very useful for debugging. i18n requirements |
| 308 | * are minimal. |
| 309 | */ |
| 310 | (void)png_safecat(msg, (sizeof msg), 10, " using zstream"); |
| 311 | # if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC |
| 312 | png_warning(png_ptr, msg); |
| 313 | |
| 314 | /* Attempt sane error recovery */ |
| 315 | if (png_ptr->zowner == png_IDAT) /* don't steal from IDAT */ |
| 316 | { |
| 317 | png_ptr->zstream.msg = PNGZ_MSG_CAST("in use by IDAT"); |
| 318 | return Z_STREAM_ERROR; |
| 319 | } |
| 320 | |
| 321 | png_ptr->zowner = 0; |
| 322 | # else |
| 323 | png_error(png_ptr, msg); |
| 324 | # endif |
| 325 | } |
| 326 | |
| 327 | { |
| 328 | int level = png_ptr->zlib_level; |
| 329 | int method = png_ptr->zlib_method; |
| 330 | int windowBits = png_ptr->zlib_window_bits; |
| 331 | int memLevel = png_ptr->zlib_mem_level; |
| 332 | int strategy; /* set below */ |
| 333 | int ret; /* zlib return code */ |
| 334 | |
| 335 | if (owner == png_IDAT) |
| 336 | { |
| 337 | if (png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY) |
| 338 | strategy = png_ptr->zlib_strategy; |
| 339 | |
| 340 | else if (png_ptr->do_filter != PNG_FILTER_NONE) |
| 341 | strategy = PNG_Z_DEFAULT_STRATEGY; |
| 342 | |
| 343 | else |
| 344 | strategy = PNG_Z_DEFAULT_NOFILTER_STRATEGY; |
| 345 | } |
| 346 | |
| 347 | else |
| 348 | { |
| 349 | # ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED |
| 350 | level = png_ptr->zlib_text_level; |
| 351 | method = png_ptr->zlib_text_method; |
| 352 | windowBits = png_ptr->zlib_text_window_bits; |
| 353 | memLevel = png_ptr->zlib_text_mem_level; |
| 354 | strategy = png_ptr->zlib_text_strategy; |
| 355 | # else |
| 356 | /* If customization is not supported the values all come from the |
| 357 | * IDAT values except for the strategy, which is fixed to the |
| 358 | * default. (This is the pre-1.6.0 behavior too, although it was |
| 359 | * implemented in a very different way.) |
| 360 | */ |
| 361 | strategy = Z_DEFAULT_STRATEGY; |
| 362 | # endif |
| 363 | } |
| 364 | |
| 365 | /* Adjust 'windowBits' down if larger than 'data_size'; to stop this |
| 366 | * happening just pass 32768 as the data_size parameter. Notice that zlib |
| 367 | * requires an extra 262 bytes in the window in addition to the data to be |
| 368 | * able to see the whole of the data, so if data_size+262 takes us to the |
| 369 | * next windowBits size we need to fix up the value later. (Because even |
| 370 | * though deflate needs the extra window, inflate does not!) |
| 371 | */ |
| 372 | if (data_size <= 16384) |
| 373 | { |
| 374 | /* IMPLEMENTATION NOTE: this 'half_window_size' stuff is only here to |
| 375 | * work round a Microsoft Visual C misbehavior which, contrary to C-90, |
| 376 | * widens the result of the following shift to 64-bits if (and, |
| 377 | * apparently, only if) it is used in a test. |
| 378 | */ |
| 379 | unsigned int half_window_size = 1U << (windowBits-1); |
| 380 | |
| 381 | while (data_size + 262 <= half_window_size) |
| 382 | { |
| 383 | half_window_size >>= 1; |
| 384 | --windowBits; |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | /* Check against the previous initialized values, if any. */ |
| 389 | if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) && |
| 390 | (png_ptr->zlib_set_level != level || |
| 391 | png_ptr->zlib_set_method != method || |
| 392 | png_ptr->zlib_set_window_bits != windowBits || |
| 393 | png_ptr->zlib_set_mem_level != memLevel || |
| 394 | png_ptr->zlib_set_strategy != strategy)) |
| 395 | { |
| 396 | if (deflateEnd(&png_ptr->zstream) != Z_OK) |
| 397 | png_warning(png_ptr, "deflateEnd failed (ignored)"); |
| 398 | |
| 399 | png_ptr->flags &= ~PNG_FLAG_ZSTREAM_INITIALIZED; |
| 400 | } |
| 401 | |
| 402 | /* For safety clear out the input and output pointers (currently zlib |
| 403 | * doesn't use them on Init, but it might in the future). |
| 404 | */ |
| 405 | png_ptr->zstream.next_in = NULL; |
| 406 | png_ptr->zstream.avail_in = 0; |
| 407 | png_ptr->zstream.next_out = NULL; |
| 408 | png_ptr->zstream.avail_out = 0; |
| 409 | |
| 410 | /* Now initialize if required, setting the new parameters, otherwise just |
| 411 | * to a simple reset to the previous parameters. |
| 412 | */ |
| 413 | if (png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) |
| 414 | ret = deflateReset(&png_ptr->zstream); |
| 415 | |
| 416 | else |
| 417 | { |
| 418 | ret = deflateInit2(&png_ptr->zstream, level, method, windowBits, |
| 419 | memLevel, strategy); |
| 420 | |
| 421 | if (ret == Z_OK) |
| 422 | png_ptr->flags |= PNG_FLAG_ZSTREAM_INITIALIZED; |
| 423 | } |
| 424 | |
| 425 | /* The return code is from either deflateReset or deflateInit2; they have |
| 426 | * pretty much the same set of error codes. |
| 427 | */ |
| 428 | if (ret == Z_OK) |
| 429 | png_ptr->zowner = owner; |
| 430 | |
| 431 | else |
| 432 | png_zstream_error(png_ptr, ret); |
| 433 | |
| 434 | return ret; |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | /* Clean up (or trim) a linked list of compression buffers. */ |
| 439 | void /* PRIVATE */ |
| 440 | png_free_buffer_list(png_structrp png_ptr, png_compression_bufferp *listp) |
| 441 | { |
| 442 | png_compression_bufferp list = *listp; |
| 443 | |
| 444 | if (list != NULL) |
| 445 | { |
| 446 | *listp = NULL; |
| 447 | |
| 448 | do |
| 449 | { |
| 450 | png_compression_bufferp next = list->next; |
| 451 | |
| 452 | png_free(png_ptr, list); |
| 453 | list = next; |
| 454 | } |
| 455 | while (list != NULL); |
| 456 | } |
John Bowler | 134c576 | 2012-08-10 10:46:45 -0500 | [diff] [blame] | 457 | } |
| 458 | |
Glenn Randers-Pehrson | 205483d | 2011-04-01 12:33:42 -0500 | [diff] [blame] | 459 | #ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 460 | /* This pair of functions encapsulates the operation of (a) compressing a |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 461 | * text string, and (b) issuing it later as a series of chunk data writes. |
| 462 | * The compression_state structure is shared context for these functions |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 463 | * set up by the caller to allow access to the relevant local variables. |
| 464 | * |
| 465 | * compression_buffer (new in 1.6.0) is just a linked list of zbuffer_size |
| 466 | * temporary buffers. From 1.6.0 it is retained in png_struct so that it will |
| 467 | * be correctly freed in the event of a write error (previous implementations |
| 468 | * just leaked memory.) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 469 | */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 470 | typedef struct |
| 471 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 472 | png_const_bytep input; /* The uncompressed input data */ |
| 473 | png_alloc_size_t input_len; /* Its length */ |
| 474 | png_uint_32 output_len; /* Final compressed length */ |
| 475 | png_byte output[1024]; /* First block of output */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 476 | } compression_state; |
| 477 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 478 | static void |
| 479 | png_text_compress_init(compression_state *comp, png_const_bytep input, |
| 480 | png_alloc_size_t input_len) |
| 481 | { |
| 482 | comp->input = input; |
| 483 | comp->input_len = input_len; |
| 484 | comp->output_len = 0; |
| 485 | } |
| 486 | |
| 487 | /* Compress the data in the compression state input */ |
| 488 | static int |
| 489 | png_text_compress(png_structrp png_ptr, png_uint_32 chunk_name, |
| 490 | compression_state *comp, png_uint_32 prefix_len) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 491 | { |
| 492 | int ret; |
| 493 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 494 | /* To find the length of the output it is necessary to first compress the |
| 495 | * input, the result is buffered rather than using the two-pass algorithm |
| 496 | * that is used on the inflate side; deflate is assumed to be slower and a |
| 497 | * PNG writer is assumed to have more memory available than a PNG reader. |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 498 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 499 | * IMPLEMENTATION NOTE: the zlib API deflateBound() can be used to find an |
| 500 | * upper limit on the output size, but it is always bigger than the input |
| 501 | * size so it is likely to be more efficient to use this linked-list |
| 502 | * approach. |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 503 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 504 | ret = png_deflate_claim(png_ptr, chunk_name, comp->input_len); |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 505 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 506 | if (ret != Z_OK) |
| 507 | return ret; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 508 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 509 | /* Set up the compression buffers, we need a loop here to avoid overflowing a |
| 510 | * uInt. Use ZLIB_IO_MAX to limit the input. The output is always limited |
| 511 | * by the output buffer size, so there is no need to check that. Since this |
| 512 | * is ANSI-C we know that an 'int', hence a uInt, is always at least 16 bits |
| 513 | * in size. |
| 514 | */ |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 515 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 516 | png_compression_bufferp *end = &png_ptr->zbuffer_list; |
| 517 | png_alloc_size_t input_len = comp->input_len; /* may be zero! */ |
| 518 | png_uint_32 output_len; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 519 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 520 | /* zlib updates these for us: */ |
| 521 | png_ptr->zstream.next_in = PNGZ_INPUT_CAST(comp->input); |
| 522 | png_ptr->zstream.avail_in = 0; /* Set below */ |
| 523 | png_ptr->zstream.next_out = comp->output; |
| 524 | png_ptr->zstream.avail_out = (sizeof comp->output); |
| 525 | |
| 526 | output_len = png_ptr->zstream.avail_out; |
| 527 | |
| 528 | do |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 529 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 530 | uInt avail_in = ZLIB_IO_MAX; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 531 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 532 | if (avail_in > input_len) |
| 533 | avail_in = (uInt)input_len; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 534 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 535 | input_len -= avail_in; |
| 536 | |
| 537 | png_ptr->zstream.avail_in = avail_in; |
| 538 | |
| 539 | if (png_ptr->zstream.avail_out == 0) |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 540 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 541 | png_compression_buffer *next; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 542 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 543 | /* Chunk data is limited to 2^31 bytes in length, so the prefix |
| 544 | * length must be counted here. |
| 545 | */ |
| 546 | if (output_len + prefix_len > PNG_UINT_31_MAX) |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 547 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 548 | ret = Z_MEM_ERROR; |
| 549 | break; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 550 | } |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 551 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 552 | /* Need a new (malloc'ed) buffer, but there may be one present |
| 553 | * already. |
| 554 | */ |
| 555 | next = *end; |
| 556 | if (next == NULL) |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 557 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 558 | next = png_voidcast(png_compression_bufferp, png_malloc_base |
| 559 | (png_ptr, PNG_COMPRESSION_BUFFER_SIZE(png_ptr))); |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 560 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 561 | if (next == NULL) |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 562 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 563 | ret = Z_MEM_ERROR; |
| 564 | break; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 565 | } |
| 566 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 567 | /* Link in this buffer (so that it will be freed later) */ |
| 568 | next->next = NULL; |
| 569 | *end = next; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 570 | } |
| 571 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 572 | png_ptr->zstream.next_out = next->output; |
| 573 | png_ptr->zstream.avail_out = png_ptr->zbuffer_size; |
| 574 | output_len += png_ptr->zstream.avail_out; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 575 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 576 | /* Move 'end' to the next buffer pointer. */ |
| 577 | end = &next->next; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 578 | } |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 579 | |
| 580 | /* Compress the data */ |
| 581 | ret = deflate(&png_ptr->zstream, |
| 582 | input_len > 0 ? Z_NO_FLUSH : Z_FINISH); |
| 583 | |
| 584 | /* Claw back input data that was not consumed (because avail_in is |
| 585 | * reset above every time round the loop). |
| 586 | */ |
| 587 | input_len += png_ptr->zstream.avail_in; |
| 588 | png_ptr->zstream.avail_in = 0; /* safety */ |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 589 | } |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 590 | while (ret == Z_OK); |
| 591 | |
| 592 | /* There may be some space left in the last output buffer, this needs to |
| 593 | * be subtracted from output_len. |
| 594 | */ |
| 595 | output_len -= png_ptr->zstream.avail_out; |
| 596 | png_ptr->zstream.avail_out = 0; /* safety */ |
| 597 | comp->output_len = output_len; |
| 598 | |
| 599 | /* Now double check the output length, put in a custom message if it is |
| 600 | * too long. Otherwise ensure the z_stream::msg pointer is set to |
| 601 | * something. |
| 602 | */ |
| 603 | if (output_len + prefix_len >= PNG_UINT_31_MAX) |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 604 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 605 | png_ptr->zstream.msg = PNGZ_MSG_CAST("compressed data too long"); |
| 606 | ret = Z_MEM_ERROR; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 607 | } |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 608 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 609 | else |
| 610 | png_zstream_error(png_ptr, ret); |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 611 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 612 | /* Reset zlib for another zTXt/iTXt or image data */ |
| 613 | png_ptr->zowner = 0; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 614 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 615 | /* The only success case is Z_STREAM_END, input_len must be 0, if not this |
| 616 | * is an internal error. |
| 617 | */ |
| 618 | if (ret == Z_STREAM_END && input_len == 0) |
| 619 | { |
| 620 | /* Fix up the deflate header, if required */ |
| 621 | optimize_cmf(comp->output, comp->input_len); |
| 622 | |
| 623 | /* But Z_OK is returned, not Z_STREAM_END; this allows the claim |
| 624 | * function above to return Z_STREAM_END on an error (though it never |
| 625 | * does in the current versions of zlib.) |
| 626 | */ |
| 627 | return Z_OK; |
| 628 | } |
| 629 | |
| 630 | else |
| 631 | return ret; |
| 632 | } |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 633 | } |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 634 | |
| 635 | /* Ship the compressed text out via chunk writes */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 636 | static void |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 637 | png_write_compressed_data_out(png_structrp png_ptr, compression_state *comp) |
| 638 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 639 | png_uint_32 output_len = comp->output_len; |
| 640 | png_const_bytep output = comp->output; |
| 641 | png_uint_32 avail = (sizeof comp->output); |
| 642 | png_compression_buffer *next = png_ptr->zbuffer_list; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 643 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 644 | for (;;) |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 645 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 646 | if (avail > output_len) |
| 647 | avail = output_len; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 648 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 649 | png_write_chunk_data(png_ptr, output, avail); |
| 650 | |
| 651 | output_len -= avail; |
| 652 | |
| 653 | if (output_len == 0 || next == NULL) |
| 654 | break; |
| 655 | |
| 656 | avail = png_ptr->zbuffer_size; |
| 657 | output = next->output; |
| 658 | next = next->next; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 659 | } |
| 660 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 661 | /* This is an internal error; 'next' must have been NULL! */ |
| 662 | if (output_len > 0) |
| 663 | png_error(png_ptr, "error writing ancillary chunked compressed data"); |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 664 | } |
| 665 | #endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */ |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 666 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 667 | #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ |
| 668 | defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) |
| 669 | /* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification, |
| 670 | * and if invalid, correct the keyword rather than discarding the entire |
| 671 | * chunk. The PNG 1.0 specification requires keywords 1-79 characters in |
| 672 | * length, forbids leading or trailing whitespace, multiple internal spaces, |
| 673 | * and the non-break space (0x80) from ISO 8859-1. Returns keyword length. |
| 674 | * |
| 675 | * The 'new_key' buffer must be 80 characters in size (for the keyword plus a |
| 676 | * trailing '\0'). If this routine returns 0 then there was no keyword, or a |
| 677 | * valid one could not be generated, and the caller must png_error. |
| 678 | */ |
| 679 | static png_uint_32 |
| 680 | png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key) |
| 681 | { |
| 682 | png_const_charp orig_key = key; |
| 683 | png_uint_32 key_len = 0; |
| 684 | int bad_character = 0; |
| 685 | int space = 1; |
| 686 | |
| 687 | png_debug(1, "in png_check_keyword"); |
| 688 | |
| 689 | if (key == NULL) |
| 690 | { |
| 691 | *new_key = 0; |
| 692 | return 0; |
| 693 | } |
| 694 | |
| 695 | while (*key && key_len < 79) |
| 696 | { |
| 697 | png_byte ch = (png_byte)(0xff & *key++); |
| 698 | |
| 699 | if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/)) |
| 700 | *new_key++ = ch, ++key_len, space = 0; |
| 701 | |
Glenn Randers-Pehrson | 0567015 | 2014-03-08 12:39:52 -0600 | [diff] [blame] | 702 | else if (space == 0) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 703 | { |
| 704 | /* A space or an invalid character when one wasn't seen immediately |
| 705 | * before; output just a space. |
| 706 | */ |
| 707 | *new_key++ = 32, ++key_len, space = 1; |
| 708 | |
| 709 | /* If the character was not a space then it is invalid. */ |
| 710 | if (ch != 32) |
| 711 | bad_character = ch; |
| 712 | } |
| 713 | |
Glenn Randers-Pehrson | 0567015 | 2014-03-08 12:39:52 -0600 | [diff] [blame] | 714 | else if (bad_character == 0) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 715 | bad_character = ch; /* just skip it, record the first error */ |
| 716 | } |
| 717 | |
| 718 | if (key_len > 0 && space) /* trailing space */ |
| 719 | { |
| 720 | --key_len, --new_key; |
Glenn Randers-Pehrson | 0567015 | 2014-03-08 12:39:52 -0600 | [diff] [blame] | 721 | if (bad_character == 0) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 722 | bad_character = 32; |
| 723 | } |
| 724 | |
| 725 | /* Terminate the keyword */ |
| 726 | *new_key = 0; |
| 727 | |
| 728 | if (key_len == 0) |
| 729 | return 0; |
| 730 | |
| 731 | /* Try to only output one warning per keyword: */ |
| 732 | if (*key) /* keyword too long */ |
| 733 | png_warning(png_ptr, "keyword truncated"); |
| 734 | |
Glenn Randers-Pehrson | 0567015 | 2014-03-08 12:39:52 -0600 | [diff] [blame] | 735 | else if (bad_character != 0) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 736 | { |
| 737 | PNG_WARNING_PARAMETERS(p) |
| 738 | |
| 739 | png_warning_parameter(p, 1, orig_key); |
| 740 | png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character); |
| 741 | |
| 742 | png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'"); |
| 743 | } |
| 744 | |
| 745 | return key_len; |
| 746 | } |
| 747 | #endif |
| 748 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 749 | /* Write the IHDR chunk, and update the png_struct with the necessary |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 750 | * information. Note that the rest of this code depends upon this |
| 751 | * information being correct. |
| 752 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 753 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 754 | png_write_IHDR(png_structrp png_ptr, png_uint_32 width, png_uint_32 height, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 755 | int bit_depth, int color_type, int compression_type, int filter_type, |
| 756 | int interlace_type) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 757 | { |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 758 | png_byte buf[13]; /* Buffer to store the IHDR info */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 759 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 760 | png_debug(1, "in png_write_IHDR"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 761 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 762 | /* Check that we have valid input data from the application info */ |
| 763 | switch (color_type) |
| 764 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 765 | case PNG_COLOR_TYPE_GRAY: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 766 | switch (bit_depth) |
| 767 | { |
| 768 | case 1: |
| 769 | case 2: |
| 770 | case 4: |
| 771 | case 8: |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 772 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 773 | case 16: |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 774 | #endif |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 775 | png_ptr->channels = 1; break; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 776 | |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 777 | default: |
| 778 | png_error(png_ptr, |
| 779 | "Invalid bit depth for grayscale image"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 780 | } |
| 781 | break; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 782 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 783 | case PNG_COLOR_TYPE_RGB: |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 784 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 785 | if (bit_depth != 8 && bit_depth != 16) |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 786 | #else |
| 787 | if (bit_depth != 8) |
| 788 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 789 | png_error(png_ptr, "Invalid bit depth for RGB image"); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 790 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 791 | png_ptr->channels = 3; |
| 792 | break; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 793 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 794 | case PNG_COLOR_TYPE_PALETTE: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 795 | switch (bit_depth) |
| 796 | { |
| 797 | case 1: |
| 798 | case 2: |
| 799 | case 4: |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 800 | case 8: |
| 801 | png_ptr->channels = 1; |
| 802 | break; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 803 | |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 804 | default: |
| 805 | png_error(png_ptr, "Invalid bit depth for paletted image"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 806 | } |
| 807 | break; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 808 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 809 | case PNG_COLOR_TYPE_GRAY_ALPHA: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 810 | if (bit_depth != 8 && bit_depth != 16) |
| 811 | png_error(png_ptr, "Invalid bit depth for grayscale+alpha image"); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 812 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 813 | png_ptr->channels = 2; |
| 814 | break; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 815 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 816 | case PNG_COLOR_TYPE_RGB_ALPHA: |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 817 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 818 | if (bit_depth != 8 && bit_depth != 16) |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 819 | #else |
| 820 | if (bit_depth != 8) |
| 821 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 822 | png_error(png_ptr, "Invalid bit depth for RGBA image"); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 823 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 824 | png_ptr->channels = 4; |
| 825 | break; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 826 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 827 | default: |
| 828 | png_error(png_ptr, "Invalid image color type specified"); |
| 829 | } |
| 830 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 831 | if (compression_type != PNG_COMPRESSION_TYPE_BASE) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 832 | { |
| 833 | png_warning(png_ptr, "Invalid compression type specified"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 834 | compression_type = PNG_COMPRESSION_TYPE_BASE; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 835 | } |
| 836 | |
Glenn Randers-Pehrson | 408b421 | 2000-12-18 09:33:57 -0600 | [diff] [blame] | 837 | /* Write filter_method 64 (intrapixel differencing) only if |
| 838 | * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and |
| 839 | * 2. Libpng did not write a PNG signature (this filter_method is only |
| 840 | * used in PNG datastreams that are embedded in MNG datastreams) and |
| 841 | * 3. The application called png_permit_mng_features with a mask that |
| 842 | * included PNG_FLAG_MNG_FILTER_64 and |
| 843 | * 4. The filter_method is 64 and |
| 844 | * 5. The color_type is RGB or RGBA |
| 845 | */ |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 846 | if ( |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 847 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 848 | !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && |
| 849 | ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) && |
| 850 | (color_type == PNG_COLOR_TYPE_RGB || |
| 851 | color_type == PNG_COLOR_TYPE_RGB_ALPHA) && |
| 852 | (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) && |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 853 | #endif |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 854 | filter_type != PNG_FILTER_TYPE_BASE) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 855 | { |
| 856 | png_warning(png_ptr, "Invalid filter type specified"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 857 | filter_type = PNG_FILTER_TYPE_BASE; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 858 | } |
| 859 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 860 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 861 | if (interlace_type != PNG_INTERLACE_NONE && |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 862 | interlace_type != PNG_INTERLACE_ADAM7) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 863 | { |
| 864 | png_warning(png_ptr, "Invalid interlace type specified"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 865 | interlace_type = PNG_INTERLACE_ADAM7; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 866 | } |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 867 | #else |
| 868 | interlace_type=PNG_INTERLACE_NONE; |
| 869 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 870 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 871 | /* Save the relevent information */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 872 | png_ptr->bit_depth = (png_byte)bit_depth; |
| 873 | png_ptr->color_type = (png_byte)color_type; |
| 874 | png_ptr->interlaced = (png_byte)interlace_type; |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 875 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 876 | png_ptr->filter_type = (png_byte)filter_type; |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 877 | #endif |
Glenn Randers-Pehrson | 5b5dcf8 | 2004-07-17 22:45:44 -0500 | [diff] [blame] | 878 | png_ptr->compression_type = (png_byte)compression_type; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 879 | png_ptr->width = width; |
| 880 | png_ptr->height = height; |
| 881 | |
| 882 | png_ptr->pixel_depth = (png_byte)(bit_depth * png_ptr->channels); |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 883 | png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, width); |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 884 | /* Set the usr info, so any transformations can modify it */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 885 | png_ptr->usr_width = png_ptr->width; |
| 886 | png_ptr->usr_bit_depth = png_ptr->bit_depth; |
| 887 | png_ptr->usr_channels = png_ptr->channels; |
| 888 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 889 | /* Pack the header information into the buffer */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 890 | png_save_uint_32(buf, width); |
| 891 | png_save_uint_32(buf + 4, height); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 892 | buf[8] = (png_byte)bit_depth; |
| 893 | buf[9] = (png_byte)color_type; |
| 894 | buf[10] = (png_byte)compression_type; |
| 895 | buf[11] = (png_byte)filter_type; |
| 896 | buf[12] = (png_byte)interlace_type; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 897 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 898 | /* Write the chunk */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 899 | png_write_complete_chunk(png_ptr, png_IHDR, buf, (png_size_t)13); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 900 | |
Glenn Randers-Pehrson | 0567015 | 2014-03-08 12:39:52 -0600 | [diff] [blame] | 901 | if ((png_ptr->do_filter) == PNG_NO_FILTERS) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 902 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 903 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE || |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 904 | png_ptr->bit_depth < 8) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 905 | png_ptr->do_filter = PNG_FILTER_NONE; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 906 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 907 | else |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 908 | png_ptr->do_filter = PNG_ALL_FILTERS; |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 909 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 910 | |
Glenn Randers-Pehrson | f837831 | 2011-03-31 22:06:04 -0500 | [diff] [blame] | 911 | png_ptr->mode = PNG_HAVE_IHDR; /* not READY_FOR_ZTXT */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 912 | } |
| 913 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 914 | /* Write the palette. We are careful not to trust png_color to be in the |
Glenn Randers-Pehrson | 345bc27 | 1998-06-14 14:43:31 -0500 | [diff] [blame] | 915 | * correct order for PNG, so people can redefine it to any convenient |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 916 | * structure. |
| 917 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 918 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 919 | png_write_PLTE(png_structrp png_ptr, png_const_colorp palette, |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 920 | png_uint_32 num_pal) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 921 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 922 | png_uint_32 i; |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 923 | png_const_colorp pal_ptr; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 924 | png_byte buf[3]; |
| 925 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 926 | png_debug(1, "in png_write_PLTE"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 927 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 928 | if (( |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 929 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 930 | !(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) && |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 931 | #endif |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 932 | num_pal == 0) || num_pal > 256) |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 933 | { |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 934 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 935 | { |
| 936 | png_error(png_ptr, "Invalid number of colors in palette"); |
| 937 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 938 | |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 939 | else |
| 940 | { |
| 941 | png_warning(png_ptr, "Invalid number of colors in palette"); |
| 942 | return; |
| 943 | } |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 944 | } |
| 945 | |
| 946 | if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR)) |
| 947 | { |
| 948 | png_warning(png_ptr, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 949 | "Ignoring request to write a PLTE chunk in grayscale PNG"); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 950 | |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 951 | return; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 952 | } |
| 953 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 954 | png_ptr->num_palette = (png_uint_16)num_pal; |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 955 | png_debug1(3, "num_palette = %d", png_ptr->num_palette); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 956 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 957 | png_write_chunk_header(png_ptr, png_PLTE, (png_uint_32)(num_pal * 3)); |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 958 | #ifdef PNG_POINTER_INDEXING_SUPPORTED |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 959 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 960 | for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 961 | { |
| 962 | buf[0] = pal_ptr->red; |
| 963 | buf[1] = pal_ptr->green; |
| 964 | buf[2] = pal_ptr->blue; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 965 | png_write_chunk_data(png_ptr, buf, (png_size_t)3); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 966 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 967 | |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 968 | #else |
Glenn Randers-Pehrson | e3f3c4e | 2010-02-07 18:08:50 -0600 | [diff] [blame] | 969 | /* This is a little slower but some buggy compilers need to do this |
| 970 | * instead |
| 971 | */ |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 972 | pal_ptr=palette; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 973 | |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 974 | for (i = 0; i < num_pal; i++) |
| 975 | { |
| 976 | buf[0] = pal_ptr[i].red; |
| 977 | buf[1] = pal_ptr[i].green; |
| 978 | buf[2] = pal_ptr[i].blue; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 979 | png_write_chunk_data(png_ptr, buf, (png_size_t)3); |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 980 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 981 | |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 982 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 983 | png_write_chunk_end(png_ptr); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 984 | png_ptr->mode |= PNG_HAVE_PLTE; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 985 | } |
| 986 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 987 | /* This is similar to png_text_compress, above, except that it does not require |
| 988 | * all of the data at once and, instead of buffering the compressed result, |
| 989 | * writes it as IDAT chunks. Unlike png_text_compress it *can* png_error out |
| 990 | * because it calls the write interface. As a result it does its own error |
| 991 | * reporting and does not return an error code. In the event of error it will |
| 992 | * just call png_error. The input data length may exceed 32-bits. The 'flush' |
| 993 | * parameter is exactly the same as that to deflate, with the following |
| 994 | * meanings: |
| 995 | * |
| 996 | * Z_NO_FLUSH: normal incremental output of compressed data |
| 997 | * Z_SYNC_FLUSH: do a SYNC_FLUSH, used by png_write_flush |
| 998 | * Z_FINISH: this is the end of the input, do a Z_FINISH and clean up |
| 999 | * |
| 1000 | * The routine manages the acquire and release of the png_ptr->zstream by |
| 1001 | * checking and (at the end) clearing png_ptr->zowner, it does some sanity |
| 1002 | * checks on the 'mode' flags while doing this. |
| 1003 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1004 | void /* PRIVATE */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1005 | png_compress_IDAT(png_structrp png_ptr, png_const_bytep input, |
| 1006 | png_alloc_size_t input_len, int flush) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1007 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1008 | if (png_ptr->zowner != png_IDAT) |
Glenn Randers-Pehrson | 5b77916 | 2004-09-04 13:25:08 -0500 | [diff] [blame] | 1009 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1010 | /* First time. Ensure we have a temporary buffer for compression and |
| 1011 | * trim the buffer list if it has more than one entry to free memory. |
| 1012 | * If 'WRITE_COMPRESSED_TEXT' is not set the list will never have been |
| 1013 | * created at this point, but the check here is quick and safe. |
Glenn Randers-Pehrson | ec8296a | 2011-04-01 15:09:05 -0500 | [diff] [blame] | 1014 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1015 | if (png_ptr->zbuffer_list == NULL) |
Glenn Randers-Pehrson | 5b77916 | 2004-09-04 13:25:08 -0500 | [diff] [blame] | 1016 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1017 | png_ptr->zbuffer_list = png_voidcast(png_compression_bufferp, |
| 1018 | png_malloc(png_ptr, PNG_COMPRESSION_BUFFER_SIZE(png_ptr))); |
| 1019 | png_ptr->zbuffer_list->next = NULL; |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 1020 | } |
| 1021 | |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 1022 | else |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1023 | png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list->next); |
| 1024 | |
| 1025 | /* It is a terminal error if we can't claim the zstream. */ |
| 1026 | if (png_deflate_claim(png_ptr, png_IDAT, png_image_size(png_ptr)) != Z_OK) |
| 1027 | png_error(png_ptr, png_ptr->zstream.msg); |
| 1028 | |
| 1029 | /* The output state is maintained in png_ptr->zstream, so it must be |
| 1030 | * initialized here after the claim. |
| 1031 | */ |
| 1032 | png_ptr->zstream.next_out = png_ptr->zbuffer_list->output; |
| 1033 | png_ptr->zstream.avail_out = png_ptr->zbuffer_size; |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 1034 | } |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 1035 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1036 | /* Now loop reading and writing until all the input is consumed or an error |
| 1037 | * terminates the operation. The _out values are maintained across calls to |
| 1038 | * this function, but the input must be reset each time. |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 1039 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1040 | png_ptr->zstream.next_in = PNGZ_INPUT_CAST(input); |
| 1041 | png_ptr->zstream.avail_in = 0; /* set below */ |
| 1042 | for (;;) |
| 1043 | { |
| 1044 | int ret; |
| 1045 | |
| 1046 | /* INPUT: from the row data */ |
| 1047 | uInt avail = ZLIB_IO_MAX; |
| 1048 | |
| 1049 | if (avail > input_len) |
| 1050 | avail = (uInt)input_len; /* safe because of the check */ |
| 1051 | |
| 1052 | png_ptr->zstream.avail_in = avail; |
| 1053 | input_len -= avail; |
| 1054 | |
| 1055 | ret = deflate(&png_ptr->zstream, input_len > 0 ? Z_NO_FLUSH : flush); |
| 1056 | |
| 1057 | /* Include as-yet unconsumed input */ |
| 1058 | input_len += png_ptr->zstream.avail_in; |
| 1059 | png_ptr->zstream.avail_in = 0; |
| 1060 | |
| 1061 | /* OUTPUT: write complete IDAT chunks when avail_out drops to zero, note |
| 1062 | * that these two zstream fields are preserved across the calls, therefore |
| 1063 | * there is no need to set these up on entry to the loop. |
| 1064 | */ |
| 1065 | if (png_ptr->zstream.avail_out == 0) |
| 1066 | { |
| 1067 | png_bytep data = png_ptr->zbuffer_list->output; |
| 1068 | uInt size = png_ptr->zbuffer_size; |
| 1069 | |
| 1070 | /* Write an IDAT containing the data then reset the buffer. The |
| 1071 | * first IDAT may need deflate header optimization. |
| 1072 | */ |
| 1073 | # ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED |
| 1074 | if (!(png_ptr->mode & PNG_HAVE_IDAT) && |
| 1075 | png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE) |
| 1076 | optimize_cmf(data, png_image_size(png_ptr)); |
| 1077 | # endif |
| 1078 | |
| 1079 | png_write_complete_chunk(png_ptr, png_IDAT, data, size); |
| 1080 | png_ptr->mode |= PNG_HAVE_IDAT; |
| 1081 | |
| 1082 | png_ptr->zstream.next_out = data; |
| 1083 | png_ptr->zstream.avail_out = size; |
| 1084 | |
| 1085 | /* For SYNC_FLUSH or FINISH it is essential to keep calling zlib with |
| 1086 | * the same flush parameter until it has finished output, for NO_FLUSH |
| 1087 | * it doesn't matter. |
| 1088 | */ |
| 1089 | if (ret == Z_OK && flush != Z_NO_FLUSH) |
| 1090 | continue; |
| 1091 | } |
| 1092 | |
| 1093 | /* The order of these checks doesn't matter much; it just effect which |
| 1094 | * possible error might be detected if multiple things go wrong at once. |
| 1095 | */ |
| 1096 | if (ret == Z_OK) /* most likely return code! */ |
| 1097 | { |
| 1098 | /* If all the input has been consumed then just return. If Z_FINISH |
| 1099 | * was used as the flush parameter something has gone wrong if we get |
| 1100 | * here. |
| 1101 | */ |
| 1102 | if (input_len == 0) |
| 1103 | { |
| 1104 | if (flush == Z_FINISH) |
| 1105 | png_error(png_ptr, "Z_OK on Z_FINISH with output space"); |
| 1106 | |
| 1107 | return; |
| 1108 | } |
| 1109 | } |
| 1110 | |
| 1111 | else if (ret == Z_STREAM_END && flush == Z_FINISH) |
| 1112 | { |
| 1113 | /* This is the end of the IDAT data; any pending output must be |
| 1114 | * flushed. For small PNG files we may still be at the beginning. |
| 1115 | */ |
| 1116 | png_bytep data = png_ptr->zbuffer_list->output; |
| 1117 | uInt size = png_ptr->zbuffer_size - png_ptr->zstream.avail_out; |
| 1118 | |
| 1119 | # ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED |
| 1120 | if (!(png_ptr->mode & PNG_HAVE_IDAT) && |
| 1121 | png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE) |
| 1122 | optimize_cmf(data, png_image_size(png_ptr)); |
| 1123 | # endif |
| 1124 | |
| 1125 | png_write_complete_chunk(png_ptr, png_IDAT, data, size); |
| 1126 | png_ptr->zstream.avail_out = 0; |
| 1127 | png_ptr->zstream.next_out = NULL; |
| 1128 | png_ptr->mode |= PNG_HAVE_IDAT | PNG_AFTER_IDAT; |
| 1129 | |
| 1130 | png_ptr->zowner = 0; /* Release the stream */ |
| 1131 | return; |
| 1132 | } |
| 1133 | |
| 1134 | else |
| 1135 | { |
| 1136 | /* This is an error condition. */ |
| 1137 | png_zstream_error(png_ptr, ret); |
| 1138 | png_error(png_ptr, png_ptr->zstream.msg); |
| 1139 | } |
| 1140 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1141 | } |
| 1142 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1143 | /* Write an IEND chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1144 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1145 | png_write_IEND(png_structrp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1146 | { |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1147 | png_debug(1, "in png_write_IEND"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1148 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1149 | png_write_complete_chunk(png_ptr, png_IEND, NULL, (png_size_t)0); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1150 | png_ptr->mode |= PNG_HAVE_IEND; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1151 | } |
| 1152 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1153 | #ifdef PNG_WRITE_gAMA_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1154 | /* Write a gAMA chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1155 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1156 | png_write_gAMA_fixed(png_structrp png_ptr, png_fixed_point file_gamma) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1157 | { |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1158 | png_byte buf[4]; |
| 1159 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1160 | png_debug(1, "in png_write_gAMA"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1161 | |
Glenn Randers-Pehrson | 626afd6 | 2009-08-20 22:52:51 -0500 | [diff] [blame] | 1162 | /* file_gamma is saved in 1/100,000ths */ |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 1163 | png_save_uint_32(buf, (png_uint_32)file_gamma); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1164 | png_write_complete_chunk(png_ptr, png_gAMA, buf, (png_size_t)4); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1165 | } |
| 1166 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1167 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1168 | #ifdef PNG_WRITE_sRGB_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1169 | /* Write a sRGB chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1170 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1171 | png_write_sRGB(png_structrp png_ptr, int srgb_intent) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1172 | { |
| 1173 | png_byte buf[1]; |
| 1174 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1175 | png_debug(1, "in png_write_sRGB"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1176 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1177 | if (srgb_intent >= PNG_sRGB_INTENT_LAST) |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1178 | png_warning(png_ptr, |
| 1179 | "Invalid sRGB rendering intent specified"); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1180 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1181 | buf[0]=(png_byte)srgb_intent; |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1182 | png_write_complete_chunk(png_ptr, png_sRGB, buf, (png_size_t)1); |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1183 | } |
| 1184 | #endif |
| 1185 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1186 | #ifdef PNG_WRITE_iCCP_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1187 | /* Write an iCCP chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1188 | void /* PRIVATE */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1189 | png_write_iCCP(png_structrp png_ptr, png_const_charp name, |
| 1190 | png_const_bytep profile) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1191 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1192 | png_uint_32 name_len; |
| 1193 | png_uint_32 profile_len; |
| 1194 | png_byte new_name[81]; /* 1 byte for the compression byte */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1195 | compression_state comp; |
Glenn Randers-Pehrson | ab9736a | 2014-04-25 06:14:50 -0500 | [diff] [blame] | 1196 | png_uint_32 temp; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1197 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1198 | png_debug(1, "in png_write_iCCP"); |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 1199 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1200 | /* These are all internal problems: the profile should have been checked |
| 1201 | * before when it was stored. |
| 1202 | */ |
John Bowler | cf49919 | 2012-03-01 21:54:07 -0600 | [diff] [blame] | 1203 | if (profile == NULL) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1204 | png_error(png_ptr, "No profile for iCCP chunk"); /* internal error */ |
John Bowler | b11b31a | 2012-03-21 07:55:46 -0500 | [diff] [blame] | 1205 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1206 | profile_len = png_get_uint_32(profile); |
John Bowler | cf49919 | 2012-03-01 21:54:07 -0600 | [diff] [blame] | 1207 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1208 | if (profile_len < 132) |
| 1209 | png_error(png_ptr, "ICC profile too short"); |
| 1210 | |
Glenn Randers-Pehrson | ab9736a | 2014-04-25 06:14:50 -0500 | [diff] [blame] | 1211 | temp = (png_uint_32) (*(profile+8)); |
| 1212 | if (temp > 3 && (profile_len & 0x03)) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1213 | png_error(png_ptr, "ICC profile length invalid (not a multiple of 4)"); |
| 1214 | |
John Bowler | cf49919 | 2012-03-01 21:54:07 -0600 | [diff] [blame] | 1215 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1216 | png_uint_32 embedded_profile_len = png_get_uint_32(profile); |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 1217 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1218 | if (profile_len != embedded_profile_len) |
| 1219 | png_error(png_ptr, "Profile length does not match profile"); |
John Bowler | cf49919 | 2012-03-01 21:54:07 -0600 | [diff] [blame] | 1220 | } |
| 1221 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1222 | name_len = png_check_keyword(png_ptr, name, new_name); |
John Bowler | cf49919 | 2012-03-01 21:54:07 -0600 | [diff] [blame] | 1223 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1224 | if (name_len == 0) |
| 1225 | png_error(png_ptr, "iCCP: invalid keyword"); |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 1226 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1227 | new_name[++name_len] = PNG_COMPRESSION_TYPE_BASE; |
Glenn Randers-Pehrson | 3a054e1 | 2009-08-01 08:53:23 -0500 | [diff] [blame] | 1228 | |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 1229 | /* Make sure we include the NULL after the name and the compression type */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1230 | ++name_len; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1231 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1232 | png_text_compress_init(&comp, profile, profile_len); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1233 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1234 | /* Allow for keyword terminator and compression byte */ |
| 1235 | if (png_text_compress(png_ptr, png_iCCP, &comp, name_len) != Z_OK) |
| 1236 | png_error(png_ptr, png_ptr->zstream.msg); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1237 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1238 | png_write_chunk_header(png_ptr, png_iCCP, name_len + comp.output_len); |
| 1239 | |
| 1240 | png_write_chunk_data(png_ptr, new_name, name_len); |
| 1241 | |
| 1242 | png_write_compressed_data_out(png_ptr, &comp); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1243 | |
| 1244 | png_write_chunk_end(png_ptr); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1245 | } |
| 1246 | #endif |
| 1247 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1248 | #ifdef PNG_WRITE_sPLT_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1249 | /* Write a sPLT chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1250 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1251 | png_write_sPLT(png_structrp png_ptr, png_const_sPLT_tp spalette) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1252 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1253 | png_uint_32 name_len; |
| 1254 | png_byte new_name[80]; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1255 | png_byte entrybuf[10]; |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 1256 | png_size_t entry_size = (spalette->depth == 8 ? 6 : 10); |
| 1257 | png_size_t palette_size = entry_size * spalette->nentries; |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 1258 | png_sPLT_entryp ep; |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1259 | #ifndef PNG_POINTER_INDEXING_SUPPORTED |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 1260 | int i; |
| 1261 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1262 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1263 | png_debug(1, "in png_write_sPLT"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1264 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1265 | name_len = png_check_keyword(png_ptr, spalette->name, new_name); |
| 1266 | |
| 1267 | if (name_len == 0) |
| 1268 | png_error(png_ptr, "sPLT: invalid keyword"); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1269 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1270 | /* Make sure we include the NULL after the name */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1271 | png_write_chunk_header(png_ptr, png_sPLT, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1272 | (png_uint_32)(name_len + 2 + palette_size)); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1273 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1274 | png_write_chunk_data(png_ptr, (png_bytep)new_name, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1275 | (png_size_t)(name_len + 1)); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1276 | |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 1277 | png_write_chunk_data(png_ptr, &spalette->depth, (png_size_t)1); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1278 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1279 | /* Loop through each palette entry, writing appropriately */ |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1280 | #ifdef PNG_POINTER_INDEXING_SUPPORTED |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1281 | for (ep = spalette->entries; ep<spalette->entries + spalette->nentries; ep++) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1282 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1283 | if (spalette->depth == 8) |
| 1284 | { |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1285 | entrybuf[0] = (png_byte)ep->red; |
| 1286 | entrybuf[1] = (png_byte)ep->green; |
| 1287 | entrybuf[2] = (png_byte)ep->blue; |
| 1288 | entrybuf[3] = (png_byte)ep->alpha; |
| 1289 | png_save_uint_16(entrybuf + 4, ep->frequency); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1290 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1291 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1292 | else |
| 1293 | { |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1294 | png_save_uint_16(entrybuf + 0, ep->red); |
| 1295 | png_save_uint_16(entrybuf + 2, ep->green); |
| 1296 | png_save_uint_16(entrybuf + 4, ep->blue); |
| 1297 | png_save_uint_16(entrybuf + 6, ep->alpha); |
| 1298 | png_save_uint_16(entrybuf + 8, ep->frequency); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1299 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1300 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1301 | png_write_chunk_data(png_ptr, entrybuf, entry_size); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1302 | } |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 1303 | #else |
| 1304 | ep=spalette->entries; |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1305 | for (i = 0; i>spalette->nentries; i++) |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 1306 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1307 | if (spalette->depth == 8) |
| 1308 | { |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1309 | entrybuf[0] = (png_byte)ep[i].red; |
| 1310 | entrybuf[1] = (png_byte)ep[i].green; |
| 1311 | entrybuf[2] = (png_byte)ep[i].blue; |
| 1312 | entrybuf[3] = (png_byte)ep[i].alpha; |
| 1313 | png_save_uint_16(entrybuf + 4, ep[i].frequency); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1314 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1315 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1316 | else |
| 1317 | { |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1318 | png_save_uint_16(entrybuf + 0, ep[i].red); |
| 1319 | png_save_uint_16(entrybuf + 2, ep[i].green); |
| 1320 | png_save_uint_16(entrybuf + 4, ep[i].blue); |
| 1321 | png_save_uint_16(entrybuf + 6, ep[i].alpha); |
| 1322 | png_save_uint_16(entrybuf + 8, ep[i].frequency); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1323 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1324 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1325 | png_write_chunk_data(png_ptr, entrybuf, entry_size); |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 1326 | } |
| 1327 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1328 | |
| 1329 | png_write_chunk_end(png_ptr); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1330 | } |
| 1331 | #endif |
| 1332 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1333 | #ifdef PNG_WRITE_sBIT_SUPPORTED |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 1334 | /* Write the sBIT chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1335 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1336 | png_write_sBIT(png_structrp png_ptr, png_const_color_8p sbit, int color_type) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1337 | { |
| 1338 | png_byte buf[4]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1339 | png_size_t size; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1340 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1341 | png_debug(1, "in png_write_sBIT"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1342 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1343 | /* Make sure we don't depend upon the order of PNG_COLOR_8 */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1344 | if (color_type & PNG_COLOR_MASK_COLOR) |
| 1345 | { |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1346 | png_byte maxbits; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1347 | |
Glenn Randers-Pehrson | 860ab2b | 1999-10-14 07:43:10 -0500 | [diff] [blame] | 1348 | maxbits = (png_byte)(color_type==PNG_COLOR_TYPE_PALETTE ? 8 : |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1349 | png_ptr->usr_bit_depth); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1350 | |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1351 | if (sbit->red == 0 || sbit->red > maxbits || |
| 1352 | sbit->green == 0 || sbit->green > maxbits || |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1353 | sbit->blue == 0 || sbit->blue > maxbits) |
| 1354 | { |
| 1355 | png_warning(png_ptr, "Invalid sBIT depth specified"); |
| 1356 | return; |
| 1357 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1358 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1359 | buf[0] = sbit->red; |
| 1360 | buf[1] = sbit->green; |
| 1361 | buf[2] = sbit->blue; |
| 1362 | size = 3; |
| 1363 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1364 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1365 | else |
| 1366 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1367 | if (sbit->gray == 0 || sbit->gray > png_ptr->usr_bit_depth) |
| 1368 | { |
| 1369 | png_warning(png_ptr, "Invalid sBIT depth specified"); |
| 1370 | return; |
| 1371 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1372 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1373 | buf[0] = sbit->gray; |
| 1374 | size = 1; |
| 1375 | } |
| 1376 | |
| 1377 | if (color_type & PNG_COLOR_MASK_ALPHA) |
| 1378 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1379 | if (sbit->alpha == 0 || sbit->alpha > png_ptr->usr_bit_depth) |
| 1380 | { |
| 1381 | png_warning(png_ptr, "Invalid sBIT depth specified"); |
| 1382 | return; |
| 1383 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1384 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1385 | buf[size++] = sbit->alpha; |
| 1386 | } |
| 1387 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1388 | png_write_complete_chunk(png_ptr, png_sBIT, buf, size); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1389 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1390 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1391 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1392 | #ifdef PNG_WRITE_cHRM_SUPPORTED |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 1393 | /* Write the cHRM chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1394 | void /* PRIVATE */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1395 | png_write_cHRM_fixed(png_structrp png_ptr, const png_xy *xy) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1396 | { |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1397 | png_byte buf[32]; |
| 1398 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1399 | png_debug(1, "in png_write_cHRM"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1400 | |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 1401 | /* Each value is saved in 1/100,000ths */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1402 | png_save_int_32(buf, xy->whitex); |
| 1403 | png_save_int_32(buf + 4, xy->whitey); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1404 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1405 | png_save_int_32(buf + 8, xy->redx); |
| 1406 | png_save_int_32(buf + 12, xy->redy); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1407 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1408 | png_save_int_32(buf + 16, xy->greenx); |
| 1409 | png_save_int_32(buf + 20, xy->greeny); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1410 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1411 | png_save_int_32(buf + 24, xy->bluex); |
| 1412 | png_save_int_32(buf + 28, xy->bluey); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1413 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1414 | png_write_complete_chunk(png_ptr, png_cHRM, buf, 32); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1415 | } |
| 1416 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1417 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1418 | #ifdef PNG_WRITE_tRNS_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1419 | /* Write the tRNS chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1420 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1421 | png_write_tRNS(png_structrp png_ptr, png_const_bytep trans_alpha, |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 1422 | png_const_color_16p tran, int num_trans, int color_type) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1423 | { |
| 1424 | png_byte buf[6]; |
| 1425 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1426 | png_debug(1, "in png_write_tRNS"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1427 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1428 | if (color_type == PNG_COLOR_TYPE_PALETTE) |
| 1429 | { |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1430 | if (num_trans <= 0 || num_trans > (int)png_ptr->num_palette) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1431 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1432 | png_app_warning(png_ptr, |
| 1433 | "Invalid number of transparent colors specified"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1434 | return; |
| 1435 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1436 | |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 1437 | /* Write the chunk out as it is */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1438 | png_write_complete_chunk(png_ptr, png_tRNS, trans_alpha, |
| 1439 | (png_size_t)num_trans); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1440 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1441 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1442 | else if (color_type == PNG_COLOR_TYPE_GRAY) |
| 1443 | { |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 1444 | /* One 16 bit value */ |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1445 | if (tran->gray >= (1 << png_ptr->bit_depth)) |
Glenn Randers-Pehrson | 1ea0ff3 | 2001-08-07 22:25:59 -0500 | [diff] [blame] | 1446 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1447 | png_app_warning(png_ptr, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1448 | "Ignoring attempt to write tRNS chunk out-of-range for bit_depth"); |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1449 | |
Glenn Randers-Pehrson | 1ea0ff3 | 2001-08-07 22:25:59 -0500 | [diff] [blame] | 1450 | return; |
| 1451 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1452 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1453 | png_save_uint_16(buf, tran->gray); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1454 | png_write_complete_chunk(png_ptr, png_tRNS, buf, (png_size_t)2); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1455 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1456 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1457 | else if (color_type == PNG_COLOR_TYPE_RGB) |
| 1458 | { |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 1459 | /* Three 16 bit values */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1460 | png_save_uint_16(buf, tran->red); |
| 1461 | png_save_uint_16(buf + 2, tran->green); |
| 1462 | png_save_uint_16(buf + 4, tran->blue); |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 1463 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1464 | if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4])) |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 1465 | #else |
| 1466 | if (buf[0] | buf[2] | buf[4]) |
| 1467 | #endif |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1468 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1469 | png_app_warning(png_ptr, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1470 | "Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8"); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1471 | return; |
| 1472 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1473 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1474 | png_write_complete_chunk(png_ptr, png_tRNS, buf, (png_size_t)6); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1475 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1476 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1477 | else |
| 1478 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1479 | png_app_warning(png_ptr, "Can't write tRNS with an alpha channel"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1480 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1481 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1482 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1483 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1484 | #ifdef PNG_WRITE_bKGD_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1485 | /* Write the background chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1486 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1487 | png_write_bKGD(png_structrp png_ptr, png_const_color_16p back, int color_type) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1488 | { |
| 1489 | png_byte buf[6]; |
| 1490 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1491 | png_debug(1, "in png_write_bKGD"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1492 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1493 | if (color_type == PNG_COLOR_TYPE_PALETTE) |
| 1494 | { |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1495 | if ( |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1496 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 1497 | (png_ptr->num_palette || |
| 1498 | (!(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE))) && |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1499 | #endif |
Glenn Randers-Pehrson | d6d8075 | 2008-12-02 09:49:43 -0600 | [diff] [blame] | 1500 | back->index >= png_ptr->num_palette) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1501 | { |
| 1502 | png_warning(png_ptr, "Invalid background palette index"); |
| 1503 | return; |
| 1504 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1505 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1506 | buf[0] = back->index; |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1507 | png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)1); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1508 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1509 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1510 | else if (color_type & PNG_COLOR_MASK_COLOR) |
| 1511 | { |
| 1512 | png_save_uint_16(buf, back->red); |
| 1513 | png_save_uint_16(buf + 2, back->green); |
| 1514 | png_save_uint_16(buf + 4, back->blue); |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 1515 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1516 | if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4])) |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 1517 | #else |
| 1518 | if (buf[0] | buf[2] | buf[4]) |
| 1519 | #endif |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1520 | { |
| 1521 | png_warning(png_ptr, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1522 | "Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8"); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1523 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1524 | return; |
| 1525 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1526 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1527 | png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)6); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1528 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1529 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1530 | else |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1531 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1532 | if (back->gray >= (1 << png_ptr->bit_depth)) |
Glenn Randers-Pehrson | 1ea0ff3 | 2001-08-07 22:25:59 -0500 | [diff] [blame] | 1533 | { |
| 1534 | png_warning(png_ptr, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1535 | "Ignoring attempt to write bKGD chunk out-of-range for bit_depth"); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1536 | |
Glenn Randers-Pehrson | 1ea0ff3 | 2001-08-07 22:25:59 -0500 | [diff] [blame] | 1537 | return; |
| 1538 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1539 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1540 | png_save_uint_16(buf, back->gray); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1541 | png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)2); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1542 | } |
| 1543 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1544 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1545 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1546 | #ifdef PNG_WRITE_hIST_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1547 | /* Write the histogram */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1548 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1549 | png_write_hIST(png_structrp png_ptr, png_const_uint_16p hist, int num_hist) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1550 | { |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1551 | int i; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1552 | png_byte buf[3]; |
| 1553 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1554 | png_debug(1, "in png_write_hIST"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1555 | |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1556 | if (num_hist > (int)png_ptr->num_palette) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1557 | { |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1558 | png_debug2(3, "num_hist = %d, num_palette = %d", num_hist, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1559 | png_ptr->num_palette); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1560 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1561 | png_warning(png_ptr, "Invalid number of histogram entries specified"); |
| 1562 | return; |
| 1563 | } |
| 1564 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1565 | png_write_chunk_header(png_ptr, png_hIST, (png_uint_32)(num_hist * 2)); |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1566 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1567 | for (i = 0; i < num_hist; i++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1568 | { |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1569 | png_save_uint_16(buf, hist[i]); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1570 | png_write_chunk_data(png_ptr, buf, (png_size_t)2); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1571 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1572 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1573 | png_write_chunk_end(png_ptr); |
| 1574 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1575 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1576 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1577 | #ifdef PNG_WRITE_tEXt_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1578 | /* Write a tEXt chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1579 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1580 | png_write_tEXt(png_structrp png_ptr, png_const_charp key, png_const_charp text, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1581 | png_size_t text_len) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1582 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1583 | png_uint_32 key_len; |
| 1584 | png_byte new_key[80]; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1585 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1586 | png_debug(1, "in png_write_tEXt"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1587 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1588 | key_len = png_check_keyword(png_ptr, key, new_key); |
| 1589 | |
| 1590 | if (key_len == 0) |
| 1591 | png_error(png_ptr, "tEXt: invalid keyword"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1592 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1593 | if (text == NULL || *text == '\0') |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1594 | text_len = 0; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1595 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1596 | else |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1597 | text_len = strlen(text); |
| 1598 | |
| 1599 | if (text_len > PNG_UINT_31_MAX - (key_len+1)) |
| 1600 | png_error(png_ptr, "tEXt: text too long"); |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 1601 | |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 1602 | /* Make sure we include the 0 after the key */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1603 | png_write_chunk_header(png_ptr, png_tEXt, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1604 | (png_uint_32)/*checked above*/(key_len + text_len + 1)); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1605 | /* |
| 1606 | * We leave it to the application to meet PNG-1.0 requirements on the |
| 1607 | * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of |
| 1608 | * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1609 | * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG. |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1610 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1611 | png_write_chunk_data(png_ptr, new_key, key_len + 1); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1612 | |
Glenn Randers-Pehrson | 0567015 | 2014-03-08 12:39:52 -0600 | [diff] [blame] | 1613 | if (text_len != 0) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1614 | png_write_chunk_data(png_ptr, (png_const_bytep)text, text_len); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1615 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1616 | png_write_chunk_end(png_ptr); |
| 1617 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1618 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1619 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1620 | #ifdef PNG_WRITE_zTXt_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1621 | /* Write a compressed text chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1622 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1623 | png_write_zTXt(png_structrp png_ptr, png_const_charp key, png_const_charp text, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1624 | png_size_t text_len, int compression) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1625 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1626 | png_uint_32 key_len; |
| 1627 | png_byte new_key[81]; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1628 | compression_state comp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1629 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1630 | png_debug(1, "in png_write_zTXt"); |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1631 | PNG_UNUSED(text_len) /* Always use strlen */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1632 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1633 | if (compression == PNG_TEXT_COMPRESSION_NONE) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1634 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1635 | png_write_tEXt(png_ptr, key, text, 0); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1636 | return; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1637 | } |
| 1638 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1639 | if (compression != PNG_TEXT_COMPRESSION_zTXt) |
| 1640 | png_error(png_ptr, "zTXt: invalid compression type"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1641 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1642 | key_len = png_check_keyword(png_ptr, key, new_key); |
| 1643 | |
| 1644 | if (key_len == 0) |
| 1645 | png_error(png_ptr, "zTXt: invalid keyword"); |
| 1646 | |
| 1647 | /* Add the compression method and 1 for the keyword separator. */ |
| 1648 | new_key[++key_len] = PNG_COMPRESSION_TYPE_BASE; |
| 1649 | ++key_len; |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1650 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1651 | /* Compute the compressed data; do it now for the length */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1652 | png_text_compress_init(&comp, (png_const_bytep)text, |
| 1653 | text == NULL ? 0 : strlen(text)); |
| 1654 | |
| 1655 | if (png_text_compress(png_ptr, png_zTXt, &comp, key_len) != Z_OK) |
| 1656 | png_error(png_ptr, png_ptr->zstream.msg); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1657 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1658 | /* Write start of chunk */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1659 | png_write_chunk_header(png_ptr, png_zTXt, key_len + comp.output_len); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1660 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1661 | /* Write key */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1662 | png_write_chunk_data(png_ptr, new_key, key_len); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1663 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1664 | /* Write the compressed data */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1665 | png_write_compressed_data_out(png_ptr, &comp); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1666 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1667 | /* Close the chunk */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1668 | png_write_chunk_end(png_ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1669 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1670 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1671 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1672 | #ifdef PNG_WRITE_iTXt_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1673 | /* Write an iTXt chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1674 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1675 | png_write_iTXt(png_structrp png_ptr, int compression, png_const_charp key, |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 1676 | png_const_charp lang, png_const_charp lang_key, png_const_charp text) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1677 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1678 | png_uint_32 key_len, prefix_len; |
| 1679 | png_size_t lang_len, lang_key_len; |
| 1680 | png_byte new_key[82]; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1681 | compression_state comp; |
| 1682 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1683 | png_debug(1, "in png_write_iTXt"); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1684 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1685 | key_len = png_check_keyword(png_ptr, key, new_key); |
Glenn Randers-Pehrson | 3744f94 | 2012-08-10 19:22:53 -0500 | [diff] [blame] | 1686 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1687 | if (key_len == 0) |
| 1688 | png_error(png_ptr, "iTXt: invalid keyword"); |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 1689 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1690 | /* Set the compression flag */ |
| 1691 | switch (compression) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1692 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1693 | case PNG_ITXT_COMPRESSION_NONE: |
| 1694 | case PNG_TEXT_COMPRESSION_NONE: |
| 1695 | compression = new_key[++key_len] = 0; /* no compression */ |
| 1696 | break; |
| 1697 | |
| 1698 | case PNG_TEXT_COMPRESSION_zTXt: |
| 1699 | case PNG_ITXT_COMPRESSION_zTXt: |
| 1700 | compression = new_key[++key_len] = 1; /* compressed */ |
| 1701 | break; |
| 1702 | |
| 1703 | default: |
| 1704 | png_error(png_ptr, "iTXt: invalid compression"); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1705 | } |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1706 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1707 | new_key[++key_len] = PNG_COMPRESSION_TYPE_BASE; |
| 1708 | ++key_len; /* for the keywod separator */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1709 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1710 | /* We leave it to the application to meet PNG-1.0 requirements on the |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1711 | * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1712 | * any non-Latin-1 characters except for NEWLINE. ISO PNG, however, |
| 1713 | * specifies that the text is UTF-8 and this really doesn't require any |
| 1714 | * checking. |
| 1715 | * |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1716 | * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG. |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1717 | * |
| 1718 | * TODO: validate the language tag correctly (see the spec.) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1719 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1720 | if (lang == NULL) lang = ""; /* empty language is valid */ |
| 1721 | lang_len = strlen(lang)+1; |
| 1722 | if (lang_key == NULL) lang_key = ""; /* may be empty */ |
| 1723 | lang_key_len = strlen(lang_key)+1; |
| 1724 | if (text == NULL) text = ""; /* may be empty */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1725 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1726 | prefix_len = key_len; |
| 1727 | if (lang_len > PNG_UINT_31_MAX-prefix_len) |
| 1728 | prefix_len = PNG_UINT_31_MAX; |
| 1729 | else |
| 1730 | prefix_len = (png_uint_32)(prefix_len + lang_len); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1731 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1732 | if (lang_key_len > PNG_UINT_31_MAX-prefix_len) |
| 1733 | prefix_len = PNG_UINT_31_MAX; |
| 1734 | else |
| 1735 | prefix_len = (png_uint_32)(prefix_len + lang_key_len); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1736 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1737 | png_text_compress_init(&comp, (png_const_bytep)text, strlen(text)); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1738 | |
Glenn Randers-Pehrson | 0567015 | 2014-03-08 12:39:52 -0600 | [diff] [blame] | 1739 | if (compression != 0) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1740 | { |
| 1741 | if (png_text_compress(png_ptr, png_iTXt, &comp, prefix_len) != Z_OK) |
| 1742 | png_error(png_ptr, png_ptr->zstream.msg); |
| 1743 | } |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1744 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1745 | else |
| 1746 | { |
| 1747 | if (comp.input_len > PNG_UINT_31_MAX-prefix_len) |
| 1748 | png_error(png_ptr, "iTXt: uncompressed text too long"); |
John Bowler | 70eb072 | 2013-04-13 16:52:09 -0500 | [diff] [blame] | 1749 | |
| 1750 | /* So the string will fit in a chunk: */ |
| 1751 | comp.output_len = (png_uint_32)/*SAFE*/comp.input_len; |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1752 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1753 | |
John Bowler | 70eb072 | 2013-04-13 16:52:09 -0500 | [diff] [blame] | 1754 | png_write_chunk_header(png_ptr, png_iTXt, comp.output_len + prefix_len); |
| 1755 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1756 | png_write_chunk_data(png_ptr, new_key, key_len); |
| 1757 | |
| 1758 | png_write_chunk_data(png_ptr, (png_const_bytep)lang, lang_len); |
| 1759 | |
| 1760 | png_write_chunk_data(png_ptr, (png_const_bytep)lang_key, lang_key_len); |
| 1761 | |
Glenn Randers-Pehrson | 0567015 | 2014-03-08 12:39:52 -0600 | [diff] [blame] | 1762 | if (compression != 0) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1763 | png_write_compressed_data_out(png_ptr, &comp); |
| 1764 | |
| 1765 | else |
| 1766 | png_write_chunk_data(png_ptr, (png_const_bytep)text, comp.input_len); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1767 | |
| 1768 | png_write_chunk_end(png_ptr); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1769 | } |
| 1770 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1771 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1772 | #ifdef PNG_WRITE_oFFs_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1773 | /* Write the oFFs chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1774 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1775 | png_write_oFFs(png_structrp png_ptr, png_int_32 x_offset, png_int_32 y_offset, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1776 | int unit_type) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1777 | { |
| 1778 | png_byte buf[9]; |
| 1779 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1780 | png_debug(1, "in png_write_oFFs"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1781 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1782 | if (unit_type >= PNG_OFFSET_LAST) |
| 1783 | png_warning(png_ptr, "Unrecognized unit type for oFFs chunk"); |
| 1784 | |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 1785 | png_save_int_32(buf, x_offset); |
| 1786 | png_save_int_32(buf + 4, y_offset); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1787 | buf[8] = (png_byte)unit_type; |
| 1788 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1789 | png_write_complete_chunk(png_ptr, png_oFFs, buf, (png_size_t)9); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1790 | } |
| 1791 | #endif |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1792 | #ifdef PNG_WRITE_pCAL_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1793 | /* Write the pCAL chunk (described in the PNG extensions document) */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1794 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1795 | png_write_pCAL(png_structrp png_ptr, png_charp purpose, png_int_32 X0, |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1796 | png_int_32 X1, int type, int nparams, png_const_charp units, |
| 1797 | png_charpp params) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1798 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1799 | png_uint_32 purpose_len; |
| 1800 | png_size_t units_len, total_len; |
John Bowler | f3f7e14 | 2011-09-09 07:32:37 -0500 | [diff] [blame] | 1801 | png_size_tp params_len; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1802 | png_byte buf[10]; |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1803 | png_byte new_purpose[80]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1804 | int i; |
| 1805 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1806 | png_debug1(1, "in png_write_pCAL (%d parameters)", nparams); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1807 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1808 | if (type >= PNG_EQUATION_LAST) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1809 | png_error(png_ptr, "Unrecognized equation type for pCAL chunk"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1810 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1811 | purpose_len = png_check_keyword(png_ptr, purpose, new_purpose); |
| 1812 | |
| 1813 | if (purpose_len == 0) |
| 1814 | png_error(png_ptr, "pCAL: invalid keyword"); |
| 1815 | |
| 1816 | ++purpose_len; /* terminator */ |
| 1817 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1818 | png_debug1(3, "pCAL purpose length = %d", (int)purpose_len); |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1819 | units_len = strlen(units) + (nparams == 0 ? 0 : 1); |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1820 | png_debug1(3, "pCAL units length = %d", (int)units_len); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1821 | total_len = purpose_len + units_len + 10; |
| 1822 | |
John Bowler | f3f7e14 | 2011-09-09 07:32:37 -0500 | [diff] [blame] | 1823 | params_len = (png_size_tp)png_malloc(png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1824 | (png_alloc_size_t)(nparams * (sizeof (png_size_t)))); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1825 | |
| 1826 | /* Find the length of each parameter, making sure we don't count the |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1827 | * null terminator for the last parameter. |
| 1828 | */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1829 | for (i = 0; i < nparams; i++) |
| 1830 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1831 | params_len[i] = strlen(params[i]) + (i == nparams - 1 ? 0 : 1); |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1832 | png_debug2(3, "pCAL parameter %d length = %lu", i, |
Glenn Randers-Pehrson | d233287 | 2010-10-12 19:19:28 -0500 | [diff] [blame] | 1833 | (unsigned long)params_len[i]); |
John Bowler | f3f7e14 | 2011-09-09 07:32:37 -0500 | [diff] [blame] | 1834 | total_len += params_len[i]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1835 | } |
| 1836 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1837 | png_debug1(3, "pCAL total length = %d", (int)total_len); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1838 | png_write_chunk_header(png_ptr, png_pCAL, (png_uint_32)total_len); |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1839 | png_write_chunk_data(png_ptr, new_purpose, purpose_len); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1840 | png_save_int_32(buf, X0); |
| 1841 | png_save_int_32(buf + 4, X1); |
| 1842 | buf[8] = (png_byte)type; |
| 1843 | buf[9] = (png_byte)nparams; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1844 | png_write_chunk_data(png_ptr, buf, (png_size_t)10); |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 1845 | png_write_chunk_data(png_ptr, (png_const_bytep)units, (png_size_t)units_len); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1846 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1847 | for (i = 0; i < nparams; i++) |
| 1848 | { |
John Bowler | f3f7e14 | 2011-09-09 07:32:37 -0500 | [diff] [blame] | 1849 | png_write_chunk_data(png_ptr, (png_const_bytep)params[i], params_len[i]); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1850 | } |
| 1851 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1852 | png_free(png_ptr, params_len); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1853 | png_write_chunk_end(png_ptr); |
| 1854 | } |
| 1855 | #endif |
| 1856 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1857 | #ifdef PNG_WRITE_sCAL_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1858 | /* Write the sCAL chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1859 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1860 | png_write_sCAL_s(png_structrp png_ptr, int unit, png_const_charp width, |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 1861 | png_const_charp height) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1862 | { |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1863 | png_byte buf[64]; |
| 1864 | png_size_t wlen, hlen, total_len; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1865 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1866 | png_debug(1, "in png_write_sCAL_s"); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1867 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1868 | wlen = strlen(width); |
| 1869 | hlen = strlen(height); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1870 | total_len = wlen + hlen + 2; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1871 | |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1872 | if (total_len > 64) |
| 1873 | { |
| 1874 | png_warning(png_ptr, "Can't write sCAL (buffer too small)"); |
| 1875 | return; |
| 1876 | } |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1877 | |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1878 | buf[0] = (png_byte)unit; |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1879 | memcpy(buf + 1, width, wlen + 1); /* Append the '\0' here */ |
| 1880 | memcpy(buf + wlen + 2, height, hlen); /* Do NOT append the '\0' here */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1881 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1882 | png_debug1(3, "sCAL total length = %u", (unsigned int)total_len); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1883 | png_write_complete_chunk(png_ptr, png_sCAL, buf, total_len); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1884 | } |
| 1885 | #endif |
| 1886 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1887 | #ifdef PNG_WRITE_pHYs_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1888 | /* Write the pHYs chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1889 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1890 | png_write_pHYs(png_structrp png_ptr, png_uint_32 x_pixels_per_unit, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1891 | png_uint_32 y_pixels_per_unit, |
| 1892 | int unit_type) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1893 | { |
| 1894 | png_byte buf[9]; |
| 1895 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1896 | png_debug(1, "in png_write_pHYs"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1897 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1898 | if (unit_type >= PNG_RESOLUTION_LAST) |
| 1899 | png_warning(png_ptr, "Unrecognized unit type for pHYs chunk"); |
| 1900 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1901 | png_save_uint_32(buf, x_pixels_per_unit); |
| 1902 | png_save_uint_32(buf + 4, y_pixels_per_unit); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1903 | buf[8] = (png_byte)unit_type; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1904 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1905 | png_write_complete_chunk(png_ptr, png_pHYs, buf, (png_size_t)9); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1906 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1907 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1908 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1909 | #ifdef PNG_WRITE_tIME_SUPPORTED |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1910 | /* Write the tIME chunk. Use either png_convert_from_struct_tm() |
| 1911 | * or png_convert_from_time_t(), or fill in the structure yourself. |
| 1912 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1913 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1914 | png_write_tIME(png_structrp png_ptr, png_const_timep mod_time) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1915 | { |
| 1916 | png_byte buf[7]; |
| 1917 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1918 | png_debug(1, "in png_write_tIME"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1919 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1920 | if (mod_time->month > 12 || mod_time->month < 1 || |
| 1921 | mod_time->day > 31 || mod_time->day < 1 || |
| 1922 | mod_time->hour > 23 || mod_time->second > 60) |
| 1923 | { |
| 1924 | png_warning(png_ptr, "Invalid time specified for tIME chunk"); |
| 1925 | return; |
| 1926 | } |
| 1927 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1928 | png_save_uint_16(buf, mod_time->year); |
| 1929 | buf[2] = mod_time->month; |
| 1930 | buf[3] = mod_time->day; |
| 1931 | buf[4] = mod_time->hour; |
| 1932 | buf[5] = mod_time->minute; |
| 1933 | buf[6] = mod_time->second; |
| 1934 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1935 | png_write_complete_chunk(png_ptr, png_tIME, buf, (png_size_t)7); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1936 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1937 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1938 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1939 | /* Initializes the row writing capability of libpng */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1940 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1941 | png_write_start_row(png_structrp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1942 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1943 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1944 | /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1945 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1946 | /* Start of interlace block */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1947 | static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1948 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1949 | /* Offset to next interlace block */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1950 | static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1951 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1952 | /* Start of interlace block in the y direction */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1953 | static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1954 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1955 | /* Offset to next interlace block in the y direction */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1956 | static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1957 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1958 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1959 | png_alloc_size_t buf_size; |
| 1960 | int usr_pixel_depth; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1961 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1962 | png_debug(1, "in png_write_start_row"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1963 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1964 | usr_pixel_depth = png_ptr->usr_channels * png_ptr->usr_bit_depth; |
| 1965 | buf_size = PNG_ROWBYTES(usr_pixel_depth, png_ptr->width) + 1; |
| 1966 | |
| 1967 | /* 1.5.6: added to allow checking in the row write code. */ |
| 1968 | png_ptr->transformed_pixel_depth = png_ptr->pixel_depth; |
| 1969 | png_ptr->maximum_pixel_depth = (png_byte)usr_pixel_depth; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1970 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1971 | /* Set up row buffer */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1972 | png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, buf_size); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1973 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1974 | png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1975 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1976 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1977 | /* Set up filtering buffer, if using this filter */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1978 | if (png_ptr->do_filter & PNG_FILTER_SUB) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1979 | { |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 1980 | png_ptr->sub_row = (png_bytep)png_malloc(png_ptr, png_ptr->rowbytes + 1); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1981 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1982 | png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1983 | } |
| 1984 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1985 | /* We only need to keep the previous row if we are using one of these. */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1986 | if (png_ptr->do_filter & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH)) |
| 1987 | { |
Glenn Randers-Pehrson | dfa99af | 2009-10-29 23:33:46 -0500 | [diff] [blame] | 1988 | /* Set up previous row buffer */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1989 | png_ptr->prev_row = (png_bytep)png_calloc(png_ptr, buf_size); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1990 | |
| 1991 | if (png_ptr->do_filter & PNG_FILTER_UP) |
| 1992 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1993 | png_ptr->up_row = (png_bytep)png_malloc(png_ptr, |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 1994 | png_ptr->rowbytes + 1); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1995 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1996 | png_ptr->up_row[0] = PNG_FILTER_VALUE_UP; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1997 | } |
| 1998 | |
| 1999 | if (png_ptr->do_filter & PNG_FILTER_AVG) |
| 2000 | { |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 2001 | png_ptr->avg_row = (png_bytep)png_malloc(png_ptr, |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 2002 | png_ptr->rowbytes + 1); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2003 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2004 | png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2005 | } |
| 2006 | |
| 2007 | if (png_ptr->do_filter & PNG_FILTER_PAETH) |
| 2008 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 2009 | png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr, |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 2010 | png_ptr->rowbytes + 1); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2011 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2012 | png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2013 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2014 | } |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 2015 | #endif /* PNG_WRITE_FILTER_SUPPORTED */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2016 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2017 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2018 | /* If interlaced, we need to set up width and height of pass */ |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2019 | if (png_ptr->interlaced) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2020 | { |
| 2021 | if (!(png_ptr->transformations & PNG_INTERLACE)) |
| 2022 | { |
| 2023 | png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 - |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2024 | png_pass_ystart[0]) / png_pass_yinc[0]; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2025 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2026 | png_ptr->usr_width = (png_ptr->width + png_pass_inc[0] - 1 - |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2027 | png_pass_start[0]) / png_pass_inc[0]; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2028 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2029 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2030 | else |
| 2031 | { |
| 2032 | png_ptr->num_rows = png_ptr->height; |
| 2033 | png_ptr->usr_width = png_ptr->width; |
| 2034 | } |
| 2035 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2036 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2037 | else |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2038 | #endif |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2039 | { |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2040 | png_ptr->num_rows = png_ptr->height; |
| 2041 | png_ptr->usr_width = png_ptr->width; |
| 2042 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2043 | } |
| 2044 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2045 | /* Internal use only. Called when finished processing a row of data. */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 2046 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2047 | png_write_finish_row(png_structrp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2048 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 2049 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2050 | /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2051 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2052 | /* Start of interlace block */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 2053 | static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2054 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2055 | /* Offset to next interlace block */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 2056 | static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2057 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2058 | /* Start of interlace block in the y direction */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 2059 | static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2060 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2061 | /* Offset to next interlace block in the y direction */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 2062 | static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 2063 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2064 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 2065 | png_debug(1, "in png_write_finish_row"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 2066 | |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 2067 | /* Next row */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2068 | png_ptr->row_number++; |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 2069 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2070 | /* See if we are done */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2071 | if (png_ptr->row_number < png_ptr->num_rows) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2072 | return; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2073 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2074 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2075 | /* If interlaced, go to next pass */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2076 | if (png_ptr->interlaced) |
| 2077 | { |
| 2078 | png_ptr->row_number = 0; |
| 2079 | if (png_ptr->transformations & PNG_INTERLACE) |
| 2080 | { |
| 2081 | png_ptr->pass++; |
| 2082 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2083 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2084 | else |
| 2085 | { |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2086 | /* Loop until we find a non-zero width or height pass */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2087 | do |
| 2088 | { |
| 2089 | png_ptr->pass++; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2090 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2091 | if (png_ptr->pass >= 7) |
| 2092 | break; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2093 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2094 | png_ptr->usr_width = (png_ptr->width + |
Glenn Randers-Pehrson | 67439c4 | 2010-08-19 07:01:09 -0500 | [diff] [blame] | 2095 | png_pass_inc[png_ptr->pass] - 1 - |
| 2096 | png_pass_start[png_ptr->pass]) / |
| 2097 | png_pass_inc[png_ptr->pass]; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2098 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2099 | png_ptr->num_rows = (png_ptr->height + |
Glenn Randers-Pehrson | 67439c4 | 2010-08-19 07:01:09 -0500 | [diff] [blame] | 2100 | png_pass_yinc[png_ptr->pass] - 1 - |
| 2101 | png_pass_ystart[png_ptr->pass]) / |
| 2102 | png_pass_yinc[png_ptr->pass]; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2103 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2104 | if (png_ptr->transformations & PNG_INTERLACE) |
| 2105 | break; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2106 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2107 | } while (png_ptr->usr_width == 0 || png_ptr->num_rows == 0); |
| 2108 | |
| 2109 | } |
| 2110 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2111 | /* Reset the row above the image for the next pass */ |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2112 | if (png_ptr->pass < 7) |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 2113 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2114 | if (png_ptr->prev_row != NULL) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2115 | memset(png_ptr->prev_row, 0, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2116 | (png_size_t)(PNG_ROWBYTES(png_ptr->usr_channels* |
| 2117 | png_ptr->usr_bit_depth, png_ptr->width)) + 1); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2118 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2119 | return; |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 2120 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2121 | } |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2122 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2123 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2124 | /* If we get here, we've just written the last row, so we need |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2125 | to flush the compressor */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2126 | png_compress_IDAT(png_ptr, NULL, 0, Z_FINISH); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2127 | } |
| 2128 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 2129 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2130 | /* Pick out the correct pixels for the interlace pass. |
| 2131 | * The basic idea here is to go through the row with a source |
| 2132 | * pointer and a destination pointer (sp and dp), and copy the |
| 2133 | * correct pixels for the pass. As the row gets compacted, |
| 2134 | * sp will always be >= dp, so we should never overwrite anything. |
| 2135 | * See the default: case for the easiest code to understand. |
| 2136 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 2137 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2138 | png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2139 | { |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2140 | /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2141 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2142 | /* Start of interlace block */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 2143 | static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2144 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2145 | /* Offset to next interlace block */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 2146 | static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2147 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 2148 | png_debug(1, "in png_do_write_interlace"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 2149 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2150 | /* We don't have to do anything on the last pass (6) */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2151 | if (pass < 6) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2152 | { |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2153 | /* Each pixel depth is handled separately */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2154 | switch (row_info->pixel_depth) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2155 | { |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2156 | case 1: |
| 2157 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2158 | png_bytep sp; |
| 2159 | png_bytep dp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2160 | int shift; |
| 2161 | int d; |
| 2162 | int value; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2163 | png_uint_32 i; |
| 2164 | png_uint_32 row_width = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2165 | |
| 2166 | dp = row; |
| 2167 | d = 0; |
| 2168 | shift = 7; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2169 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2170 | for (i = png_pass_start[pass]; i < row_width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2171 | i += png_pass_inc[pass]) |
| 2172 | { |
| 2173 | sp = row + (png_size_t)(i >> 3); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2174 | value = (int)(*sp >> (7 - (int)(i & 0x07))) & 0x01; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2175 | d |= (value << shift); |
| 2176 | |
| 2177 | if (shift == 0) |
| 2178 | { |
| 2179 | shift = 7; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2180 | *dp++ = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2181 | d = 0; |
| 2182 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2183 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2184 | else |
| 2185 | shift--; |
| 2186 | |
| 2187 | } |
| 2188 | if (shift != 7) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2189 | *dp = (png_byte)d; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2190 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2191 | break; |
| 2192 | } |
Glenn Randers-Pehrson | 67439c4 | 2010-08-19 07:01:09 -0500 | [diff] [blame] | 2193 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2194 | case 2: |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2195 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2196 | png_bytep sp; |
| 2197 | png_bytep dp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2198 | int shift; |
| 2199 | int d; |
| 2200 | int value; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2201 | png_uint_32 i; |
| 2202 | png_uint_32 row_width = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2203 | |
| 2204 | dp = row; |
| 2205 | shift = 6; |
| 2206 | d = 0; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2207 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2208 | for (i = png_pass_start[pass]; i < row_width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2209 | i += png_pass_inc[pass]) |
| 2210 | { |
| 2211 | sp = row + (png_size_t)(i >> 2); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2212 | value = (*sp >> ((3 - (int)(i & 0x03)) << 1)) & 0x03; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2213 | d |= (value << shift); |
| 2214 | |
| 2215 | if (shift == 0) |
| 2216 | { |
| 2217 | shift = 6; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2218 | *dp++ = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2219 | d = 0; |
| 2220 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2221 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2222 | else |
| 2223 | shift -= 2; |
| 2224 | } |
| 2225 | if (shift != 6) |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2226 | *dp = (png_byte)d; |
| 2227 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2228 | break; |
| 2229 | } |
Glenn Randers-Pehrson | 67439c4 | 2010-08-19 07:01:09 -0500 | [diff] [blame] | 2230 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2231 | case 4: |
| 2232 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2233 | png_bytep sp; |
| 2234 | png_bytep dp; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2235 | int shift; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2236 | int d; |
| 2237 | int value; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2238 | png_uint_32 i; |
| 2239 | png_uint_32 row_width = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2240 | |
| 2241 | dp = row; |
| 2242 | shift = 4; |
| 2243 | d = 0; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2244 | for (i = png_pass_start[pass]; i < row_width; |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2245 | i += png_pass_inc[pass]) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2246 | { |
| 2247 | sp = row + (png_size_t)(i >> 1); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2248 | value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2249 | d |= (value << shift); |
| 2250 | |
| 2251 | if (shift == 0) |
| 2252 | { |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2253 | shift = 4; |
| 2254 | *dp++ = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2255 | d = 0; |
| 2256 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2257 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2258 | else |
| 2259 | shift -= 4; |
| 2260 | } |
| 2261 | if (shift != 4) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2262 | *dp = (png_byte)d; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2263 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2264 | break; |
| 2265 | } |
Glenn Randers-Pehrson | 67439c4 | 2010-08-19 07:01:09 -0500 | [diff] [blame] | 2266 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2267 | default: |
| 2268 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2269 | png_bytep sp; |
| 2270 | png_bytep dp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2271 | png_uint_32 i; |
| 2272 | png_uint_32 row_width = row_info->width; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2273 | png_size_t pixel_bytes; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2274 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2275 | /* Start at the beginning */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2276 | dp = row; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2277 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2278 | /* Find out how many bytes each pixel takes up */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2279 | pixel_bytes = (row_info->pixel_depth >> 3); |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2280 | |
| 2281 | /* Loop through the row, only looking at the pixels that matter */ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2282 | for (i = png_pass_start[pass]; i < row_width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2283 | i += png_pass_inc[pass]) |
| 2284 | { |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2285 | /* Find out where the original pixel is */ |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 2286 | sp = row + (png_size_t)i * pixel_bytes; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2287 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2288 | /* Move the pixel */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2289 | if (dp != sp) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2290 | memcpy(dp, sp, pixel_bytes); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2291 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2292 | /* Next pixel */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2293 | dp += pixel_bytes; |
| 2294 | } |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2295 | break; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2296 | } |
| 2297 | } |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2298 | /* Set new row width */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2299 | row_info->width = (row_info->width + |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2300 | png_pass_inc[pass] - 1 - |
| 2301 | png_pass_start[pass]) / |
| 2302 | png_pass_inc[pass]; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2303 | |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2304 | row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, |
| 2305 | row_info->width); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2306 | } |
| 2307 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2308 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2309 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2310 | /* This filters the row, chooses which filter to use, if it has not already |
| 2311 | * been specified by the application, and then writes the row out with the |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2312 | * chosen filter. |
| 2313 | */ |
Glenn Randers-Pehrson | 24afd07 | 2014-03-05 16:55:19 -0600 | [diff] [blame] | 2314 | static void |
| 2315 | png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row, |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 2316 | png_size_t row_bytes); |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 2317 | |
Glenn Randers-Pehrson | 7806777 | 2004-11-02 21:49:39 -0600 | [diff] [blame] | 2318 | #define PNG_MAXSUM (((png_uint_32)(-1)) >> 1) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2319 | #define PNG_HISHIFT 10 |
Glenn Randers-Pehrson | ea3bcd7 | 1998-03-07 14:33:00 -0600 | [diff] [blame] | 2320 | #define PNG_LOMASK ((png_uint_32)0xffffL) |
| 2321 | #define PNG_HIMASK ((png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT)) |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 2322 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2323 | png_write_find_filter(png_structrp png_ptr, png_row_infop row_info) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2324 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 2325 | png_bytep best_row; |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 2326 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 2327 | png_bytep prev_row, row_buf; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2328 | png_uint_32 mins, bpp; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2329 | png_byte filter_to_do = png_ptr->do_filter; |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 2330 | png_size_t row_bytes = row_info->rowbytes; |
Glenn Randers-Pehrson | 9d8b41e | 2009-07-19 14:45:43 -0500 | [diff] [blame] | 2331 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 2332 | int num_p_filters = png_ptr->num_prev_filters; |
Glenn Randers-Pehrson | 821b710 | 2010-06-24 16:16:32 -0500 | [diff] [blame] | 2333 | #endif |
Glenn Randers-Pehrson | 9d8b41e | 2009-07-19 14:45:43 -0500 | [diff] [blame] | 2334 | |
| 2335 | png_debug(1, "in png_write_find_filter"); |
| 2336 | |
| 2337 | #ifndef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
Glenn Randers-Pehrson | 4ace0e1 | 2009-07-19 15:04:35 -0500 | [diff] [blame] | 2338 | if (png_ptr->row_number == 0 && filter_to_do == PNG_ALL_FILTERS) |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 2339 | { |
Glenn Randers-Pehrson | 67439c4 | 2010-08-19 07:01:09 -0500 | [diff] [blame] | 2340 | /* These will never be selected so we need not test them. */ |
| 2341 | filter_to_do &= ~(PNG_FILTER_UP | PNG_FILTER_PAETH); |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 2342 | } |
Glenn Randers-Pehrson | 821b710 | 2010-06-24 16:16:32 -0500 | [diff] [blame] | 2343 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2344 | |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 2345 | /* Find out how many bytes offset each pixel is */ |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 2346 | bpp = (row_info->pixel_depth + 7) >> 3; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2347 | |
| 2348 | prev_row = png_ptr->prev_row; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 2349 | #endif |
| 2350 | best_row = png_ptr->row_buf; |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 2351 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 2352 | row_buf = best_row; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2353 | mins = PNG_MAXSUM; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2354 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2355 | /* The prediction method we use is to find which method provides the |
| 2356 | * smallest value when summing the absolute values of the distances |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 2357 | * from zero, using anything >= 128 as negative numbers. This is known |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2358 | * as the "minimum sum of absolute differences" heuristic. Other |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2359 | * heuristics are the "weighted minimum sum of absolute differences" |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2360 | * (experimental and can in theory improve compression), and the "zlib |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 2361 | * predictive" method (not implemented yet), which does test compressions |
| 2362 | * of lines using different filter methods, and then chooses the |
| 2363 | * (series of) filter(s) that give minimum compressed data size (VERY |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2364 | * computationally expensive). |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 2365 | * |
| 2366 | * GRR 980525: consider also |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2367 | * |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 2368 | * (1) minimum sum of absolute differences from running average (i.e., |
| 2369 | * keep running sum of non-absolute differences & count of bytes) |
| 2370 | * [track dispersion, too? restart average if dispersion too large?] |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2371 | * |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 2372 | * (1b) minimum sum of absolute differences from sliding average, probably |
| 2373 | * with window size <= deflate window (usually 32K) |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2374 | * |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 2375 | * (2) minimum sum of squared differences from zero or running average |
| 2376 | * (i.e., ~ root-mean-square approach) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2377 | */ |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2378 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2379 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2380 | /* We don't need to test the 'no filter' case if this is the only filter |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2381 | * that has been chosen, as it doesn't actually do anything to the data. |
| 2382 | */ |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2383 | if ((filter_to_do & PNG_FILTER_NONE) && filter_to_do != PNG_FILTER_NONE) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2384 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2385 | png_bytep rp; |
| 2386 | png_uint_32 sum = 0; |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 2387 | png_size_t i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2388 | int v; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2389 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2390 | for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2391 | { |
| 2392 | v = *rp; |
| 2393 | sum += (v < 128) ? v : 256 - v; |
| 2394 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2395 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 2396 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2397 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2398 | { |
| 2399 | png_uint_32 sumhi, sumlo; |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2400 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2401 | sumlo = sum & PNG_LOMASK; |
| 2402 | sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; /* Gives us some footroom */ |
| 2403 | |
| 2404 | /* Reduce the sum if we match any of the previous rows */ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2405 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2406 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2407 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2408 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2409 | sumlo = (sumlo * png_ptr->filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2410 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2411 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2412 | sumhi = (sumhi * png_ptr->filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2413 | PNG_WEIGHT_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2414 | } |
| 2415 | } |
| 2416 | |
| 2417 | /* Factor in the cost of this filter (this is here for completeness, |
| 2418 | * but it makes no sense to have a "cost" for the NONE filter, as |
| 2419 | * it has the minimum possible computational cost - none). |
| 2420 | */ |
| 2421 | sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2422 | PNG_COST_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2423 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2424 | sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2425 | PNG_COST_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2426 | |
| 2427 | if (sumhi > PNG_HIMASK) |
| 2428 | sum = PNG_MAXSUM; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2429 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2430 | else |
| 2431 | sum = (sumhi << PNG_HISHIFT) + sumlo; |
| 2432 | } |
| 2433 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2434 | mins = sum; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2435 | } |
| 2436 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2437 | /* Sub filter */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2438 | if (filter_to_do == PNG_FILTER_SUB) |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2439 | /* It's the only filter so no testing is needed */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2440 | { |
| 2441 | png_bytep rp, lp, dp; |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 2442 | png_size_t i; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2443 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2444 | for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp; |
| 2445 | i++, rp++, dp++) |
| 2446 | { |
| 2447 | *dp = *rp; |
| 2448 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2449 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2450 | for (lp = row_buf + 1; i < row_bytes; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2451 | i++, rp++, lp++, dp++) |
| 2452 | { |
| 2453 | *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff); |
| 2454 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2455 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2456 | best_row = png_ptr->sub_row; |
| 2457 | } |
| 2458 | |
| 2459 | else if (filter_to_do & PNG_FILTER_SUB) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2460 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2461 | png_bytep rp, dp, lp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2462 | png_uint_32 sum = 0, lmins = mins; |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 2463 | png_size_t i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2464 | int v; |
| 2465 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 2466 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2467 | /* We temporarily increase the "minimum sum" by the factor we |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2468 | * would reduce the sum of this filter, so that we can do the |
| 2469 | * early exit comparison without scaling the sum each time. |
| 2470 | */ |
| 2471 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2472 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2473 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2474 | png_uint_32 lmhi, lmlo; |
| 2475 | lmlo = lmins & PNG_LOMASK; |
| 2476 | lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; |
| 2477 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2478 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2479 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2480 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2481 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2482 | lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> |
Glenn Randers-Pehrson | 67439c4 | 2010-08-19 07:01:09 -0500 | [diff] [blame] | 2483 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2484 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2485 | lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> |
Glenn Randers-Pehrson | 67439c4 | 2010-08-19 07:01:09 -0500 | [diff] [blame] | 2486 | PNG_WEIGHT_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2487 | } |
| 2488 | } |
| 2489 | |
| 2490 | lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2491 | PNG_COST_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2492 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2493 | lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2494 | PNG_COST_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2495 | |
| 2496 | if (lmhi > PNG_HIMASK) |
| 2497 | lmins = PNG_MAXSUM; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2498 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2499 | else |
| 2500 | lmins = (lmhi << PNG_HISHIFT) + lmlo; |
| 2501 | } |
| 2502 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2503 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2504 | for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp; |
| 2505 | i++, rp++, dp++) |
| 2506 | { |
| 2507 | v = *dp = *rp; |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2508 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2509 | sum += (v < 128) ? v : 256 - v; |
| 2510 | } |
Glenn Randers-Pehrson | 67439c4 | 2010-08-19 07:01:09 -0500 | [diff] [blame] | 2511 | |
Glenn Randers-Pehrson | 5b5dcf8 | 2004-07-17 22:45:44 -0500 | [diff] [blame] | 2512 | for (lp = row_buf + 1; i < row_bytes; |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 2513 | i++, rp++, lp++, dp++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2514 | { |
| 2515 | v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2516 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2517 | sum += (v < 128) ? v : 256 - v; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2518 | |
| 2519 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2520 | break; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2521 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2522 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 2523 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2524 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2525 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2526 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2527 | png_uint_32 sumhi, sumlo; |
| 2528 | sumlo = sum & PNG_LOMASK; |
| 2529 | sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; |
| 2530 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2531 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2532 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2533 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2534 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2535 | sumlo = (sumlo * png_ptr->inv_filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2536 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2537 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2538 | sumhi = (sumhi * png_ptr->inv_filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2539 | PNG_WEIGHT_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2540 | } |
| 2541 | } |
| 2542 | |
| 2543 | sumlo = (sumlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2544 | PNG_COST_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2545 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2546 | sumhi = (sumhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2547 | PNG_COST_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2548 | |
| 2549 | if (sumhi > PNG_HIMASK) |
| 2550 | sum = PNG_MAXSUM; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2551 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2552 | else |
| 2553 | sum = (sumhi << PNG_HISHIFT) + sumlo; |
| 2554 | } |
| 2555 | #endif |
| 2556 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2557 | if (sum < mins) |
| 2558 | { |
| 2559 | mins = sum; |
| 2560 | best_row = png_ptr->sub_row; |
| 2561 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2562 | } |
| 2563 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2564 | /* Up filter */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2565 | if (filter_to_do == PNG_FILTER_UP) |
| 2566 | { |
| 2567 | png_bytep rp, dp, pp; |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 2568 | png_size_t i; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2569 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2570 | for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2571 | pp = prev_row + 1; i < row_bytes; |
| 2572 | i++, rp++, pp++, dp++) |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2573 | { |
| 2574 | *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff); |
| 2575 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2576 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2577 | best_row = png_ptr->up_row; |
| 2578 | } |
| 2579 | |
| 2580 | else if (filter_to_do & PNG_FILTER_UP) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2581 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2582 | png_bytep rp, dp, pp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2583 | png_uint_32 sum = 0, lmins = mins; |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 2584 | png_size_t i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2585 | int v; |
| 2586 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2587 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 2588 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2589 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2590 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2591 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2592 | png_uint_32 lmhi, lmlo; |
| 2593 | lmlo = lmins & PNG_LOMASK; |
| 2594 | lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; |
| 2595 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2596 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2597 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2598 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2599 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2600 | lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2601 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2602 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2603 | lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2604 | PNG_WEIGHT_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2605 | } |
| 2606 | } |
| 2607 | |
| 2608 | lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2609 | PNG_COST_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2610 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2611 | lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2612 | PNG_COST_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2613 | |
| 2614 | if (lmhi > PNG_HIMASK) |
| 2615 | lmins = PNG_MAXSUM; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2616 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2617 | else |
| 2618 | lmins = (lmhi << PNG_HISHIFT) + lmlo; |
| 2619 | } |
| 2620 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2621 | |
| 2622 | for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2623 | pp = prev_row + 1; i < row_bytes; i++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2624 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2625 | v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2626 | |
| 2627 | sum += (v < 128) ? v : 256 - v; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2628 | |
| 2629 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2630 | break; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2631 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2632 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 2633 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2634 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2635 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2636 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2637 | png_uint_32 sumhi, sumlo; |
| 2638 | sumlo = sum & PNG_LOMASK; |
| 2639 | sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; |
| 2640 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2641 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2642 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2643 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2644 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2645 | sumlo = (sumlo * png_ptr->filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2646 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2647 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2648 | sumhi = (sumhi * png_ptr->filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2649 | PNG_WEIGHT_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2650 | } |
| 2651 | } |
| 2652 | |
| 2653 | sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2654 | PNG_COST_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2655 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2656 | sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2657 | PNG_COST_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2658 | |
| 2659 | if (sumhi > PNG_HIMASK) |
| 2660 | sum = PNG_MAXSUM; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2661 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2662 | else |
| 2663 | sum = (sumhi << PNG_HISHIFT) + sumlo; |
| 2664 | } |
| 2665 | #endif |
| 2666 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2667 | if (sum < mins) |
| 2668 | { |
| 2669 | mins = sum; |
| 2670 | best_row = png_ptr->up_row; |
| 2671 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2672 | } |
| 2673 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2674 | /* Avg filter */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2675 | if (filter_to_do == PNG_FILTER_AVG) |
| 2676 | { |
| 2677 | png_bytep rp, dp, pp, lp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2678 | png_uint_32 i; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2679 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2680 | for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1, |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2681 | pp = prev_row + 1; i < bpp; i++) |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2682 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2683 | *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2684 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2685 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2686 | for (lp = row_buf + 1; i < row_bytes; i++) |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2687 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2688 | *dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) |
| 2689 | & 0xff); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2690 | } |
| 2691 | best_row = png_ptr->avg_row; |
| 2692 | } |
| 2693 | |
| 2694 | else if (filter_to_do & PNG_FILTER_AVG) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2695 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2696 | png_bytep rp, dp, pp, lp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2697 | png_uint_32 sum = 0, lmins = mins; |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 2698 | png_size_t i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2699 | int v; |
| 2700 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 2701 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2702 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2703 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2704 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2705 | png_uint_32 lmhi, lmlo; |
| 2706 | lmlo = lmins & PNG_LOMASK; |
| 2707 | lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; |
| 2708 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2709 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2710 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2711 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_AVG) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2712 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2713 | lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2714 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2715 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2716 | lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2717 | PNG_WEIGHT_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2718 | } |
| 2719 | } |
| 2720 | |
| 2721 | lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2722 | PNG_COST_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2723 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2724 | lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2725 | PNG_COST_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2726 | |
| 2727 | if (lmhi > PNG_HIMASK) |
| 2728 | lmins = PNG_MAXSUM; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2729 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2730 | else |
| 2731 | lmins = (lmhi << PNG_HISHIFT) + lmlo; |
| 2732 | } |
| 2733 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2734 | |
| 2735 | for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1, |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2736 | pp = prev_row + 1; i < bpp; i++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2737 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2738 | v = *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2739 | |
| 2740 | sum += (v < 128) ? v : 256 - v; |
| 2741 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2742 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2743 | for (lp = row_buf + 1; i < row_bytes; i++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2744 | { |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2745 | v = *dp++ = |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2746 | (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) & 0xff); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2747 | |
| 2748 | sum += (v < 128) ? v : 256 - v; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2749 | |
| 2750 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2751 | break; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2752 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2753 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 2754 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2755 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2756 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2757 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2758 | png_uint_32 sumhi, sumlo; |
| 2759 | sumlo = sum & PNG_LOMASK; |
| 2760 | sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; |
| 2761 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2762 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2763 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2764 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2765 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2766 | sumlo = (sumlo * png_ptr->filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2767 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2768 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2769 | sumhi = (sumhi * png_ptr->filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2770 | PNG_WEIGHT_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2771 | } |
| 2772 | } |
| 2773 | |
| 2774 | sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2775 | PNG_COST_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2776 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2777 | sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2778 | PNG_COST_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2779 | |
| 2780 | if (sumhi > PNG_HIMASK) |
| 2781 | sum = PNG_MAXSUM; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2782 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2783 | else |
| 2784 | sum = (sumhi << PNG_HISHIFT) + sumlo; |
| 2785 | } |
| 2786 | #endif |
| 2787 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2788 | if (sum < mins) |
| 2789 | { |
| 2790 | mins = sum; |
| 2791 | best_row = png_ptr->avg_row; |
| 2792 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2793 | } |
| 2794 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2795 | /* Paeth filter */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2796 | if (filter_to_do == PNG_FILTER_PAETH) |
| 2797 | { |
| 2798 | png_bytep rp, dp, pp, cp, lp; |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 2799 | png_size_t i; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2800 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2801 | for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2802 | pp = prev_row + 1; i < bpp; i++) |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2803 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2804 | *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2805 | } |
| 2806 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2807 | for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++) |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2808 | { |
| 2809 | int a, b, c, pa, pb, pc, p; |
| 2810 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2811 | b = *pp++; |
| 2812 | c = *cp++; |
| 2813 | a = *lp++; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2814 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2815 | p = b - c; |
| 2816 | pc = a - c; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2817 | |
| 2818 | #ifdef PNG_USE_ABS |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2819 | pa = abs(p); |
| 2820 | pb = abs(pc); |
| 2821 | pc = abs(p + pc); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2822 | #else |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2823 | pa = p < 0 ? -p : p; |
| 2824 | pb = pc < 0 ? -pc : pc; |
| 2825 | pc = (p + pc) < 0 ? -(p + pc) : p + pc; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2826 | #endif |
| 2827 | |
| 2828 | p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c; |
| 2829 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2830 | *dp++ = (png_byte)(((int)*rp++ - p) & 0xff); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2831 | } |
| 2832 | best_row = png_ptr->paeth_row; |
| 2833 | } |
| 2834 | |
| 2835 | else if (filter_to_do & PNG_FILTER_PAETH) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2836 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2837 | png_bytep rp, dp, pp, cp, lp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2838 | png_uint_32 sum = 0, lmins = mins; |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 2839 | png_size_t i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2840 | int v; |
| 2841 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 2842 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2843 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2844 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2845 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2846 | png_uint_32 lmhi, lmlo; |
| 2847 | lmlo = lmins & PNG_LOMASK; |
| 2848 | lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; |
| 2849 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2850 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2851 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2852 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2853 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2854 | lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2855 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2856 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2857 | lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2858 | PNG_WEIGHT_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2859 | } |
| 2860 | } |
| 2861 | |
| 2862 | lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2863 | PNG_COST_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2864 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2865 | lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2866 | PNG_COST_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2867 | |
| 2868 | if (lmhi > PNG_HIMASK) |
| 2869 | lmins = PNG_MAXSUM; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2870 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2871 | else |
| 2872 | lmins = (lmhi << PNG_HISHIFT) + lmlo; |
| 2873 | } |
| 2874 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2875 | |
| 2876 | for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2877 | pp = prev_row + 1; i < bpp; i++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2878 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2879 | v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2880 | |
| 2881 | sum += (v < 128) ? v : 256 - v; |
| 2882 | } |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2883 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2884 | for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2885 | { |
| 2886 | int a, b, c, pa, pb, pc, p; |
| 2887 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2888 | b = *pp++; |
| 2889 | c = *cp++; |
| 2890 | a = *lp++; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2891 | |
| 2892 | #ifndef PNG_SLOW_PAETH |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2893 | p = b - c; |
| 2894 | pc = a - c; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2895 | #ifdef PNG_USE_ABS |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2896 | pa = abs(p); |
| 2897 | pb = abs(pc); |
| 2898 | pc = abs(p + pc); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2899 | #else |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2900 | pa = p < 0 ? -p : p; |
| 2901 | pb = pc < 0 ? -pc : pc; |
| 2902 | pc = (p + pc) < 0 ? -(p + pc) : p + pc; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2903 | #endif |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2904 | p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c; |
| 2905 | #else /* PNG_SLOW_PAETH */ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2906 | p = a + b - c; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2907 | pa = abs(p - a); |
| 2908 | pb = abs(p - b); |
| 2909 | pc = abs(p - c); |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2910 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2911 | if (pa <= pb && pa <= pc) |
| 2912 | p = a; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2913 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2914 | else if (pb <= pc) |
| 2915 | p = b; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2916 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2917 | else |
| 2918 | p = c; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2919 | #endif /* PNG_SLOW_PAETH */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2920 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2921 | v = *dp++ = (png_byte)(((int)*rp++ - p) & 0xff); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2922 | |
| 2923 | sum += (v < 128) ? v : 256 - v; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2924 | |
| 2925 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2926 | break; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2927 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2928 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 2929 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2930 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2931 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2932 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2933 | png_uint_32 sumhi, sumlo; |
| 2934 | sumlo = sum & PNG_LOMASK; |
| 2935 | sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; |
| 2936 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2937 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2938 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2939 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2940 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2941 | sumlo = (sumlo * png_ptr->filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2942 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2943 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2944 | sumhi = (sumhi * png_ptr->filter_weights[j]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2945 | PNG_WEIGHT_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2946 | } |
| 2947 | } |
| 2948 | |
| 2949 | sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2950 | PNG_COST_SHIFT; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2951 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2952 | sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >> |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2953 | PNG_COST_SHIFT; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2954 | |
| 2955 | if (sumhi > PNG_HIMASK) |
| 2956 | sum = PNG_MAXSUM; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2957 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2958 | else |
| 2959 | sum = (sumhi << PNG_HISHIFT) + sumlo; |
| 2960 | } |
| 2961 | #endif |
| 2962 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2963 | if (sum < mins) |
| 2964 | { |
| 2965 | best_row = png_ptr->paeth_row; |
| 2966 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2967 | } |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 2968 | #endif /* PNG_WRITE_FILTER_SUPPORTED */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2969 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 2970 | /* Do the actual writing of the filtered row data from the chosen filter. */ |
| 2971 | png_write_filtered_row(png_ptr, best_row, row_info->rowbytes+1); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2972 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 2973 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 2974 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2975 | /* Save the type of filter we picked this time for future calculations */ |
| 2976 | if (png_ptr->num_prev_filters > 0) |
| 2977 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2978 | int j; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2979 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2980 | for (j = 1; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2981 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2982 | png_ptr->prev_filters[j] = png_ptr->prev_filters[j - 1]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2983 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2984 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2985 | png_ptr->prev_filters[j] = best_row[0]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2986 | } |
| 2987 | #endif |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 2988 | #endif /* PNG_WRITE_FILTER_SUPPORTED */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2989 | } |
| 2990 | |
| 2991 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2992 | /* Do the actual writing of a previously filtered row. */ |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 2993 | static void |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2994 | png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2995 | png_size_t full_row_length/*includes filter byte*/) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2996 | { |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 2997 | png_debug(1, "in png_write_filtered_row"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 2998 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 2999 | png_debug1(2, "filter = %d", filtered_row[0]); |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 3000 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3001 | png_compress_IDAT(png_ptr, filtered_row, full_row_length, Z_NO_FLUSH); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 3002 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 3003 | /* Swap the current and previous rows */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3004 | if (png_ptr->prev_row != NULL) |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 3005 | { |
| 3006 | png_bytep tptr; |
| 3007 | |
| 3008 | tptr = png_ptr->prev_row; |
| 3009 | png_ptr->prev_row = png_ptr->row_buf; |
| 3010 | png_ptr->row_buf = tptr; |
| 3011 | } |
| 3012 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 3013 | /* Finish row - updates counters and flushes zlib if last row */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 3014 | png_write_finish_row(png_ptr); |
| 3015 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 3016 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 3017 | png_ptr->flush_rows++; |
| 3018 | |
| 3019 | if (png_ptr->flush_dist > 0 && |
| 3020 | png_ptr->flush_rows >= png_ptr->flush_dist) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3021 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 3022 | png_write_flush(png_ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3023 | } |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 3024 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3025 | } |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 3026 | #endif /* PNG_WRITE_SUPPORTED */ |