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 | 71a3c1f | 2008-11-26 12:00:38 -0600 | [diff] [blame^] | 4 | * Last changed in libpng 1.4.0 [November 26, 2008] |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 5 | * For conditions of distribution and use, see copyright notice in png.h |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 6 | * Copyright (c) 1998-2008 Glenn Randers-Pehrson |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 7 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 8 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 9 | */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 10 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 11 | #include "png.h" |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 12 | #ifdef PNG_WRITE_SUPPORTED |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 13 | #include "pngpriv.h" |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 14 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 15 | /* Place a 32-bit number into a buffer in PNG byte order. We work |
| 16 | * with unsigned numbers for convenience, although one supported |
| 17 | * ancillary chunk uses signed (two's complement) numbers. |
| 18 | */ |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 19 | void PNGAPI |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 20 | png_save_uint_32(png_bytep buf, png_uint_32 i) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 21 | { |
| 22 | buf[0] = (png_byte)((i >> 24) & 0xff); |
| 23 | buf[1] = (png_byte)((i >> 16) & 0xff); |
| 24 | buf[2] = (png_byte)((i >> 8) & 0xff); |
| 25 | buf[3] = (png_byte)(i & 0xff); |
| 26 | } |
| 27 | |
Glenn Randers-Pehrson | 86dc981 | 2006-05-10 07:27:44 -0500 | [diff] [blame] | 28 | #if defined(PNG_SAVE_INT_32_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 29 | /* The png_save_int_32 function assumes integers are stored in two's |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 30 | * complement format. If this isn't the case, then this routine needs to |
| 31 | * be modified to write data in two's complement format. |
| 32 | */ |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 33 | void PNGAPI |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 34 | png_save_int_32(png_bytep buf, png_int_32 i) |
| 35 | { |
| 36 | buf[0] = (png_byte)((i >> 24) & 0xff); |
| 37 | buf[1] = (png_byte)((i >> 16) & 0xff); |
| 38 | buf[2] = (png_byte)((i >> 8) & 0xff); |
| 39 | buf[3] = (png_byte)(i & 0xff); |
| 40 | } |
Glenn Randers-Pehrson | 86dc981 | 2006-05-10 07:27:44 -0500 | [diff] [blame] | 41 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 42 | |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 43 | /* Place a 16-bit number into a buffer in PNG byte order. |
| 44 | * The parameter is declared unsigned int, not png_uint_16, |
| 45 | * just to avoid potential problems on pre-ANSI C compilers. |
| 46 | */ |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 47 | void PNGAPI |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 48 | png_save_uint_16(png_bytep buf, unsigned int i) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 49 | { |
| 50 | buf[0] = (png_byte)((i >> 8) & 0xff); |
| 51 | buf[1] = (png_byte)(i & 0xff); |
| 52 | } |
| 53 | |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 54 | /* Simple function to write the signature. If we have already written |
| 55 | * the magic bytes of the signature, or more likely, the PNG stream is |
| 56 | * being embedded into another stream and doesn't need its own signature, |
| 57 | * we should call png_set_sig_bytes() to tell libpng how many of the |
| 58 | * bytes have already been written. |
| 59 | */ |
| 60 | void PNGAPI |
| 61 | png_write_sig(png_structp png_ptr) |
| 62 | { |
| 63 | 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] | 64 | |
| 65 | #ifdef PNG_IO_STATE_SUPPORTED |
| 66 | /* inform the I/O callback that the signature is being written */ |
| 67 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_SIGNATURE; |
| 68 | #endif |
| 69 | |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 70 | /* write the rest of the 8 byte signature */ |
| 71 | png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes], |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 72 | (png_size_t)(8 - png_ptr->sig_bytes)); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 73 | if (png_ptr->sig_bytes < 3) |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 74 | png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; |
| 75 | } |
| 76 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 77 | /* Write a PNG chunk all at once. The type is an array of ASCII characters |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 78 | * representing the chunk name. The array must be at least 4 bytes in |
| 79 | * length, and does not need to be null terminated. To be safe, pass the |
| 80 | * pre-defined chunk names here, and if you need a new one, define it |
| 81 | * where the others are defined. The length is the length of the data. |
| 82 | * All the data must be present. If that is not possible, use the |
| 83 | * png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end() |
| 84 | * functions instead. |
| 85 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 86 | void PNGAPI |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 87 | png_write_chunk(png_structp png_ptr, png_bytep chunk_name, |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 88 | png_bytep data, png_size_t length) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 89 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 90 | if (png_ptr == NULL) return; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 91 | png_write_chunk_start(png_ptr, chunk_name, (png_uint_32)length); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 92 | png_write_chunk_data(png_ptr, data, (png_size_t)length); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 93 | png_write_chunk_end(png_ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 94 | } |
| 95 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 96 | /* 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] | 97 | * The total_length is the sum of the lengths of all the data you will be |
| 98 | * passing in png_write_chunk_data(). |
| 99 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 100 | void PNGAPI |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 101 | png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name, |
| 102 | png_uint_32 length) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 103 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 104 | png_byte buf[8]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 105 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 106 | #ifdef PNG_IO_STATE_SUPPORTED |
| 107 | /* Inform the I/O callback that the chunk header is being written. |
| 108 | * PNG_IO_CHUNK_HDR requires a single I/O call. |
| 109 | */ |
| 110 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_HDR; |
| 111 | #endif |
| 112 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 113 | png_debug2(0, "Writing %s chunk, length = %lu", chunk_name, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 114 | (unsigned long)length); |
| 115 | if (png_ptr == NULL) return; |
| 116 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 117 | /* write the length and the chunk name */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 118 | png_save_uint_32(buf, length); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 119 | png_memcpy(buf + 4, chunk_name, 4); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 120 | png_write_data(png_ptr, buf, (png_size_t)8); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 121 | /* put the chunk name into png_ptr->chunk_name */ |
| 122 | png_memcpy(png_ptr->chunk_name, chunk_name, 4); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 123 | /* reset the crc and run it over the chunk name */ |
| 124 | png_reset_crc(png_ptr); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 125 | png_calculate_crc(png_ptr, chunk_name, 4); |
| 126 | |
| 127 | #ifdef PNG_IO_STATE_SUPPORTED |
| 128 | /* Inform the I/O callback that chunk data will (possibly) be written. |
| 129 | * PNG_IO_CHUNK_DATA does NOT require a specific number of I/O calls. |
| 130 | */ |
| 131 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_DATA; |
| 132 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 133 | } |
| 134 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 135 | /* Write the data of a PNG chunk started with png_write_chunk_start(). |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 136 | * Note that multiple calls to this function are allowed, and that the |
| 137 | * sum of the lengths from these calls *must* add up to the total_length |
| 138 | * given to png_write_chunk_start(). |
| 139 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 140 | void PNGAPI |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 141 | png_write_chunk_data(png_structp png_ptr, png_bytep data, png_size_t length) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 142 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 143 | /* write the data, and run the CRC over it */ |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 144 | if (png_ptr == NULL) return; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 145 | if (data != NULL && length > 0) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 146 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 147 | png_write_data(png_ptr, data, length); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 148 | /* update the CRC after writing the data, |
| 149 | * in case that the user I/O routine alters it. |
| 150 | */ |
| 151 | png_calculate_crc(png_ptr, data, length); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 152 | } |
| 153 | } |
| 154 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 155 | /* Finish a chunk started with png_write_chunk_start(). */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 156 | void PNGAPI |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 157 | png_write_chunk_end(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 158 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 159 | png_byte buf[4]; |
| 160 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 161 | if (png_ptr == NULL) return; |
| 162 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 163 | #ifdef PNG_IO_STATE_SUPPORTED |
| 164 | /* Inform the I/O callback that the chunk CRC is being written. |
| 165 | * PNG_IO_CHUNK_CRC requires a single I/O function call. |
| 166 | */ |
| 167 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_CRC; |
| 168 | #endif |
| 169 | |
| 170 | /* write the crc in a single operation */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 171 | png_save_uint_32(buf, png_ptr->crc); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 172 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 173 | png_write_data(png_ptr, buf, (png_size_t)4); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 174 | } |
| 175 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 176 | #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 177 | /* |
| 178 | * This pair of functions encapsulates the operation of (a) compressing a |
| 179 | * text string, and (b) issuing it later as a series of chunk data writes. |
| 180 | * The compression_state structure is shared context for these functions |
| 181 | * set up by the caller in order to make the whole mess thread-safe. |
| 182 | */ |
| 183 | |
| 184 | typedef struct |
| 185 | { |
| 186 | char *input; /* the uncompressed input data */ |
| 187 | int input_len; /* its length */ |
| 188 | int num_output_ptr; /* number of output pointers used */ |
| 189 | int max_output_ptr; /* size of output_ptr */ |
| 190 | png_charpp output_ptr; /* array of pointers to output */ |
| 191 | } compression_state; |
| 192 | |
| 193 | /* compress given text into storage in the png_ptr structure */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 194 | static int /* PRIVATE */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 195 | png_text_compress(png_structp png_ptr, |
| 196 | png_charp text, png_size_t text_len, int compression, |
| 197 | compression_state *comp) |
| 198 | { |
| 199 | int ret; |
| 200 | |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 201 | comp->num_output_ptr = 0; |
| 202 | comp->max_output_ptr = 0; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 203 | comp->output_ptr = NULL; |
| 204 | comp->input = NULL; |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 205 | comp->input_len = 0; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 206 | |
| 207 | /* we may just want to pass the text right through */ |
| 208 | if (compression == PNG_TEXT_COMPRESSION_NONE) |
| 209 | { |
| 210 | comp->input = text; |
| 211 | comp->input_len = text_len; |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 212 | return((int)text_len); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 213 | } |
| 214 | |
| 215 | if (compression >= PNG_TEXT_COMPRESSION_LAST) |
| 216 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 217 | #if !defined(PNG_NO_STDIO) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 218 | char msg[50]; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 219 | png_snprintf(msg, 50, "Unknown compression type %d", compression); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 220 | png_warning(png_ptr, msg); |
| 221 | #else |
| 222 | png_warning(png_ptr, "Unknown compression type"); |
| 223 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 224 | } |
| 225 | |
| 226 | /* We can't write the chunk until we find out how much data we have, |
| 227 | * which means we need to run the compressor first and save the |
| 228 | * output. This shouldn't be a problem, as the vast majority of |
| 229 | * comments should be reasonable, but we will set up an array of |
| 230 | * malloc'd pointers to be sure. |
| 231 | * |
| 232 | * If we knew the application was well behaved, we could simplify this |
| 233 | * greatly by assuming we can always malloc an output buffer large |
| 234 | * enough to hold the compressed text ((1001 * text_len / 1000) + 12) |
| 235 | * and malloc this directly. The only time this would be a bad idea is |
| 236 | * if we can't malloc more than 64K and we have 64K of random input |
| 237 | * data, or if the input string is incredibly large (although this |
| 238 | * wouldn't cause a failure, just a slowdown due to swapping). |
| 239 | */ |
| 240 | |
| 241 | /* set up the compression buffers */ |
| 242 | png_ptr->zstream.avail_in = (uInt)text_len; |
| 243 | png_ptr->zstream.next_in = (Bytef *)text; |
| 244 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 245 | png_ptr->zstream.next_out = (Bytef *)png_ptr->zbuf; |
| 246 | |
| 247 | /* this is the same compression loop as in png_write_row() */ |
| 248 | do |
| 249 | { |
| 250 | /* compress the data */ |
| 251 | ret = deflate(&png_ptr->zstream, Z_NO_FLUSH); |
| 252 | if (ret != Z_OK) |
| 253 | { |
| 254 | /* error */ |
| 255 | if (png_ptr->zstream.msg != NULL) |
| 256 | png_error(png_ptr, png_ptr->zstream.msg); |
| 257 | else |
| 258 | png_error(png_ptr, "zlib error"); |
| 259 | } |
| 260 | /* check to see if we need more room */ |
Glenn Randers-Pehrson | 16e1166 | 2004-11-01 14:13:40 -0600 | [diff] [blame] | 261 | if (!(png_ptr->zstream.avail_out)) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 262 | { |
| 263 | /* make sure the output array has room */ |
| 264 | if (comp->num_output_ptr >= comp->max_output_ptr) |
| 265 | { |
| 266 | int old_max; |
| 267 | |
| 268 | old_max = comp->max_output_ptr; |
| 269 | comp->max_output_ptr = comp->num_output_ptr + 4; |
| 270 | if (comp->output_ptr != NULL) |
| 271 | { |
| 272 | png_charpp old_ptr; |
| 273 | |
| 274 | old_ptr = comp->output_ptr; |
| 275 | comp->output_ptr = (png_charpp)png_malloc(png_ptr, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 276 | (png_size_t) |
| 277 | (comp->max_output_ptr * png_sizeof(png_charpp))); |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 278 | png_memcpy(comp->output_ptr, old_ptr, old_max |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 279 | * png_sizeof(png_charp)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 280 | png_free(png_ptr, old_ptr); |
| 281 | } |
| 282 | else |
| 283 | comp->output_ptr = (png_charpp)png_malloc(png_ptr, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 284 | (png_size_t) |
| 285 | (comp->max_output_ptr * png_sizeof(png_charp))); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 286 | } |
| 287 | |
| 288 | /* save the data */ |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 289 | comp->output_ptr[comp->num_output_ptr] = |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 290 | (png_charp)png_malloc(png_ptr, |
| 291 | png_ptr->zbuf_size); |
Glenn Randers-Pehrson | 82ae383 | 2001-04-20 10:32:10 -0500 | [diff] [blame] | 292 | png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf, |
| 293 | png_ptr->zbuf_size); |
| 294 | comp->num_output_ptr++; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 295 | |
| 296 | /* and reset the buffer */ |
| 297 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 298 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 299 | } |
| 300 | /* continue until we don't have any more to compress */ |
| 301 | } while (png_ptr->zstream.avail_in); |
| 302 | |
| 303 | /* finish the compression */ |
| 304 | do |
| 305 | { |
| 306 | /* tell zlib we are finished */ |
| 307 | ret = deflate(&png_ptr->zstream, Z_FINISH); |
Glenn Randers-Pehrson | 104622b | 2000-05-29 08:58:03 -0500 | [diff] [blame] | 308 | |
| 309 | if (ret == Z_OK) |
| 310 | { |
| 311 | /* check to see if we need more room */ |
| 312 | if (!(png_ptr->zstream.avail_out)) |
| 313 | { |
| 314 | /* check to make sure our output array has room */ |
| 315 | if (comp->num_output_ptr >= comp->max_output_ptr) |
| 316 | { |
| 317 | int old_max; |
| 318 | |
| 319 | old_max = comp->max_output_ptr; |
| 320 | comp->max_output_ptr = comp->num_output_ptr + 4; |
| 321 | if (comp->output_ptr != NULL) |
| 322 | { |
| 323 | png_charpp old_ptr; |
| 324 | |
| 325 | old_ptr = comp->output_ptr; |
| 326 | /* This could be optimized to realloc() */ |
| 327 | comp->output_ptr = (png_charpp)png_malloc(png_ptr, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 328 | (png_size_t)(comp->max_output_ptr * |
| 329 | png_sizeof(png_charp))); |
Glenn Randers-Pehrson | 82ae383 | 2001-04-20 10:32:10 -0500 | [diff] [blame] | 330 | png_memcpy(comp->output_ptr, old_ptr, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 331 | old_max * png_sizeof(png_charp)); |
Glenn Randers-Pehrson | 104622b | 2000-05-29 08:58:03 -0500 | [diff] [blame] | 332 | png_free(png_ptr, old_ptr); |
| 333 | } |
| 334 | else |
| 335 | comp->output_ptr = (png_charpp)png_malloc(png_ptr, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 336 | (png_size_t)(comp->max_output_ptr * |
| 337 | png_sizeof(png_charp))); |
Glenn Randers-Pehrson | 104622b | 2000-05-29 08:58:03 -0500 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | /* save off the data */ |
| 341 | comp->output_ptr[comp->num_output_ptr] = |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 342 | (png_charp)png_malloc(png_ptr, |
| 343 | (png_size_t)png_ptr->zbuf_size); |
Glenn Randers-Pehrson | 82ae383 | 2001-04-20 10:32:10 -0500 | [diff] [blame] | 344 | png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf, |
| 345 | png_ptr->zbuf_size); |
| 346 | comp->num_output_ptr++; |
Glenn Randers-Pehrson | 104622b | 2000-05-29 08:58:03 -0500 | [diff] [blame] | 347 | |
| 348 | /* and reset the buffer pointers */ |
| 349 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 350 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 351 | } |
| 352 | } |
| 353 | else if (ret != Z_STREAM_END) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 354 | { |
| 355 | /* we got an error */ |
| 356 | if (png_ptr->zstream.msg != NULL) |
| 357 | png_error(png_ptr, png_ptr->zstream.msg); |
| 358 | else |
| 359 | png_error(png_ptr, "zlib error"); |
| 360 | } |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 361 | } while (ret != Z_STREAM_END); |
| 362 | |
| 363 | /* text length is number of buffers plus last buffer */ |
| 364 | text_len = png_ptr->zbuf_size * comp->num_output_ptr; |
| 365 | if (png_ptr->zstream.avail_out < png_ptr->zbuf_size) |
| 366 | text_len += png_ptr->zbuf_size - (png_size_t)png_ptr->zstream.avail_out; |
| 367 | |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 368 | return((int)text_len); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 369 | } |
| 370 | |
| 371 | /* ship the compressed text out via chunk writes */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 372 | static void /* PRIVATE */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 373 | png_write_compressed_data_out(png_structp png_ptr, compression_state *comp) |
| 374 | { |
| 375 | int i; |
| 376 | |
| 377 | /* handle the no-compression case */ |
| 378 | if (comp->input) |
| 379 | { |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 380 | png_write_chunk_data(png_ptr, (png_bytep)comp->input, |
| 381 | (png_size_t)comp->input_len); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 382 | return; |
| 383 | } |
| 384 | |
| 385 | /* write saved output buffers, if any */ |
| 386 | for (i = 0; i < comp->num_output_ptr; i++) |
| 387 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 388 | png_write_chunk_data(png_ptr, (png_bytep)comp->output_ptr[i], |
| 389 | (png_size_t)png_ptr->zbuf_size); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 390 | png_free(png_ptr, comp->output_ptr[i]); |
| 391 | } |
| 392 | if (comp->max_output_ptr != 0) |
| 393 | png_free(png_ptr, comp->output_ptr); |
| 394 | /* write anything left in zbuf */ |
| 395 | if (png_ptr->zstream.avail_out < (png_uint_32)png_ptr->zbuf_size) |
| 396 | png_write_chunk_data(png_ptr, png_ptr->zbuf, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 397 | (png_size_t)(png_ptr->zbuf_size - png_ptr->zstream.avail_out)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 398 | |
Glenn Randers-Pehrson | 878b31e | 2004-11-12 22:04:56 -0600 | [diff] [blame] | 399 | /* reset zlib for another zTXt/iTXt or image data */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 400 | deflateReset(&png_ptr->zstream); |
Glenn Randers-Pehrson | 878b31e | 2004-11-12 22:04:56 -0600 | [diff] [blame] | 401 | png_ptr->zstream.data_type = Z_BINARY; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 402 | } |
| 403 | #endif |
| 404 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 405 | /* 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] | 406 | * information. Note that the rest of this code depends upon this |
| 407 | * information being correct. |
| 408 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 409 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 410 | png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height, |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 411 | int bit_depth, int color_type, int compression_type, int filter_type, |
| 412 | int interlace_type) |
| 413 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 414 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 415 | PNG_IHDR; |
| 416 | #endif |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 417 | int ret; |
| 418 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 419 | png_byte buf[13]; /* buffer to store the IHDR info */ |
| 420 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 421 | png_debug(1, "in png_write_IHDR"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 422 | /* Check that we have valid input data from the application info */ |
| 423 | switch (color_type) |
| 424 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 425 | case PNG_COLOR_TYPE_GRAY: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 426 | switch (bit_depth) |
| 427 | { |
| 428 | case 1: |
| 429 | case 2: |
| 430 | case 4: |
| 431 | case 8: |
| 432 | case 16: png_ptr->channels = 1; break; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 433 | default: png_error(png_ptr, "Invalid bit depth for grayscale image"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 434 | } |
| 435 | break; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 436 | case PNG_COLOR_TYPE_RGB: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 437 | if (bit_depth != 8 && bit_depth != 16) |
| 438 | png_error(png_ptr, "Invalid bit depth for RGB image"); |
| 439 | png_ptr->channels = 3; |
| 440 | break; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 441 | case PNG_COLOR_TYPE_PALETTE: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 442 | switch (bit_depth) |
| 443 | { |
| 444 | case 1: |
| 445 | case 2: |
| 446 | case 4: |
| 447 | case 8: png_ptr->channels = 1; break; |
| 448 | default: png_error(png_ptr, "Invalid bit depth for paletted image"); |
| 449 | } |
| 450 | break; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 451 | case PNG_COLOR_TYPE_GRAY_ALPHA: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 452 | if (bit_depth != 8 && bit_depth != 16) |
| 453 | png_error(png_ptr, "Invalid bit depth for grayscale+alpha image"); |
| 454 | png_ptr->channels = 2; |
| 455 | break; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 456 | case PNG_COLOR_TYPE_RGB_ALPHA: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 457 | if (bit_depth != 8 && bit_depth != 16) |
| 458 | png_error(png_ptr, "Invalid bit depth for RGBA image"); |
| 459 | png_ptr->channels = 4; |
| 460 | break; |
| 461 | default: |
| 462 | png_error(png_ptr, "Invalid image color type specified"); |
| 463 | } |
| 464 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 465 | if (compression_type != PNG_COMPRESSION_TYPE_BASE) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 466 | { |
| 467 | png_warning(png_ptr, "Invalid compression type specified"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 468 | compression_type = PNG_COMPRESSION_TYPE_BASE; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 469 | } |
| 470 | |
Glenn Randers-Pehrson | 408b421 | 2000-12-18 09:33:57 -0600 | [diff] [blame] | 471 | /* Write filter_method 64 (intrapixel differencing) only if |
| 472 | * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and |
| 473 | * 2. Libpng did not write a PNG signature (this filter_method is only |
| 474 | * used in PNG datastreams that are embedded in MNG datastreams) and |
| 475 | * 3. The application called png_permit_mng_features with a mask that |
| 476 | * included PNG_FLAG_MNG_FILTER_64 and |
| 477 | * 4. The filter_method is 64 and |
| 478 | * 5. The color_type is RGB or RGBA |
| 479 | */ |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 480 | if ( |
| 481 | #if defined(PNG_MNG_FEATURES_SUPPORTED) |
| 482 | !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && |
Glenn Randers-Pehrson | 408b421 | 2000-12-18 09:33:57 -0600 | [diff] [blame] | 483 | ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) && |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 484 | (color_type == PNG_COLOR_TYPE_RGB || |
Glenn Randers-Pehrson | 408b421 | 2000-12-18 09:33:57 -0600 | [diff] [blame] | 485 | color_type == PNG_COLOR_TYPE_RGB_ALPHA) && |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 486 | (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) && |
| 487 | #endif |
| 488 | filter_type != PNG_FILTER_TYPE_BASE) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 489 | { |
| 490 | png_warning(png_ptr, "Invalid filter type specified"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 491 | filter_type = PNG_FILTER_TYPE_BASE; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 492 | } |
| 493 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 494 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 495 | if (interlace_type != PNG_INTERLACE_NONE && |
| 496 | interlace_type != PNG_INTERLACE_ADAM7) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 497 | { |
| 498 | png_warning(png_ptr, "Invalid interlace type specified"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 499 | interlace_type = PNG_INTERLACE_ADAM7; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 500 | } |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 501 | #else |
| 502 | interlace_type=PNG_INTERLACE_NONE; |
| 503 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 504 | |
| 505 | /* save off the relevent information */ |
| 506 | png_ptr->bit_depth = (png_byte)bit_depth; |
| 507 | png_ptr->color_type = (png_byte)color_type; |
| 508 | png_ptr->interlaced = (png_byte)interlace_type; |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 509 | #if defined(PNG_MNG_FEATURES_SUPPORTED) |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 510 | png_ptr->filter_type = (png_byte)filter_type; |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 511 | #endif |
Glenn Randers-Pehrson | 5b5dcf8 | 2004-07-17 22:45:44 -0500 | [diff] [blame] | 512 | png_ptr->compression_type = (png_byte)compression_type; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 513 | png_ptr->width = width; |
| 514 | png_ptr->height = height; |
| 515 | |
| 516 | png_ptr->pixel_depth = (png_byte)(bit_depth * png_ptr->channels); |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 517 | png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, width); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 518 | /* set the usr info, so any transformations can modify it */ |
| 519 | png_ptr->usr_width = png_ptr->width; |
| 520 | png_ptr->usr_bit_depth = png_ptr->bit_depth; |
| 521 | png_ptr->usr_channels = png_ptr->channels; |
| 522 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 523 | /* pack the header information into the buffer */ |
| 524 | png_save_uint_32(buf, width); |
| 525 | png_save_uint_32(buf + 4, height); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 526 | buf[8] = (png_byte)bit_depth; |
| 527 | buf[9] = (png_byte)color_type; |
| 528 | buf[10] = (png_byte)compression_type; |
| 529 | buf[11] = (png_byte)filter_type; |
| 530 | buf[12] = (png_byte)interlace_type; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 531 | |
| 532 | /* write the chunk */ |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 533 | png_write_chunk(png_ptr, (png_bytep)png_IHDR, buf, (png_size_t)13); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 534 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 535 | /* initialize zlib with PNG info */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 536 | png_ptr->zstream.zalloc = png_zalloc; |
| 537 | png_ptr->zstream.zfree = png_zfree; |
| 538 | png_ptr->zstream.opaque = (voidpf)png_ptr; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 539 | if (!(png_ptr->do_filter)) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 540 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 541 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE || |
| 542 | png_ptr->bit_depth < 8) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 543 | png_ptr->do_filter = PNG_FILTER_NONE; |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 544 | else |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 545 | png_ptr->do_filter = PNG_ALL_FILTERS; |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 546 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 547 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY)) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 548 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 549 | if (png_ptr->do_filter != PNG_FILTER_NONE) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 550 | png_ptr->zlib_strategy = Z_FILTERED; |
| 551 | else |
| 552 | png_ptr->zlib_strategy = Z_DEFAULT_STRATEGY; |
| 553 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 554 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_LEVEL)) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 555 | png_ptr->zlib_level = Z_DEFAULT_COMPRESSION; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 556 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL)) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 557 | png_ptr->zlib_mem_level = 8; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 558 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS)) |
Glenn Randers-Pehrson | 5b77916 | 2004-09-04 13:25:08 -0500 | [diff] [blame] | 559 | png_ptr->zlib_window_bits = 15; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 560 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_METHOD)) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 561 | png_ptr->zlib_method = 8; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 562 | ret = deflateInit2(&png_ptr->zstream, png_ptr->zlib_level, |
| 563 | png_ptr->zlib_method, png_ptr->zlib_window_bits, |
| 564 | png_ptr->zlib_mem_level, png_ptr->zlib_strategy); |
| 565 | if (ret != Z_OK) |
| 566 | { |
| 567 | if (ret == Z_VERSION_ERROR) png_error(png_ptr, |
| 568 | "zlib failed to initialize compressor -- version error"); |
| 569 | if (ret == Z_STREAM_ERROR) png_error(png_ptr, |
| 570 | "zlib failed to initialize compressor -- stream error"); |
| 571 | if (ret == Z_MEM_ERROR) png_error(png_ptr, |
| 572 | "zlib failed to initialize compressor -- mem error"); |
| 573 | png_error(png_ptr, "zlib failed to initialize compressor"); |
| 574 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 575 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 576 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
Glenn Randers-Pehrson | 878b31e | 2004-11-12 22:04:56 -0600 | [diff] [blame] | 577 | /* libpng is not interested in zstream.data_type */ |
| 578 | /* set it to a predefined value, to avoid its evaluation inside zlib */ |
| 579 | png_ptr->zstream.data_type = Z_BINARY; |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 580 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 581 | png_ptr->mode = PNG_HAVE_IHDR; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 582 | } |
| 583 | |
| 584 | /* 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] | 585 | * 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] | 586 | * structure. |
| 587 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 588 | void /* PRIVATE */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 589 | png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 590 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 591 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 592 | PNG_PLTE; |
| 593 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 594 | png_uint_32 i; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 595 | png_colorp pal_ptr; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 596 | png_byte buf[3]; |
| 597 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 598 | png_debug(1, "in png_write_PLTE"); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 599 | if (( |
Glenn Randers-Pehrson | 1fd5fb3 | 2001-05-06 05:34:26 -0500 | [diff] [blame] | 600 | #if defined(PNG_MNG_FEATURES_SUPPORTED) |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 601 | !(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) && |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 602 | #endif |
| 603 | num_pal == 0) || num_pal > 256) |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 604 | { |
| 605 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 606 | { |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 607 | png_error(png_ptr, "Invalid number of colors in palette"); |
| 608 | } |
| 609 | else |
| 610 | { |
| 611 | png_warning(png_ptr, "Invalid number of colors in palette"); |
| 612 | return; |
| 613 | } |
| 614 | } |
| 615 | |
| 616 | if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR)) |
| 617 | { |
| 618 | png_warning(png_ptr, |
| 619 | "Ignoring request to write a PLTE chunk in grayscale PNG"); |
| 620 | return; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 621 | } |
| 622 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 623 | png_ptr->num_palette = (png_uint_16)num_pal; |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 624 | png_debug1(3, "num_palette = %d", png_ptr->num_palette); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 625 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 626 | png_write_chunk_start(png_ptr, (png_bytep)png_PLTE, |
| 627 | (png_uint_32)(num_pal * 3)); |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 628 | #ifndef PNG_NO_POINTER_INDEXING |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 629 | for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 630 | { |
| 631 | buf[0] = pal_ptr->red; |
| 632 | buf[1] = pal_ptr->green; |
| 633 | buf[2] = pal_ptr->blue; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 634 | png_write_chunk_data(png_ptr, buf, (png_size_t)3); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 635 | } |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 636 | #else |
| 637 | /* This is a little slower but some buggy compilers need to do this instead */ |
| 638 | pal_ptr=palette; |
| 639 | for (i = 0; i < num_pal; i++) |
| 640 | { |
| 641 | buf[0] = pal_ptr[i].red; |
| 642 | buf[1] = pal_ptr[i].green; |
| 643 | buf[2] = pal_ptr[i].blue; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 644 | png_write_chunk_data(png_ptr, buf, (png_size_t)3); |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 645 | } |
| 646 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 647 | png_write_chunk_end(png_ptr); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 648 | png_ptr->mode |= PNG_HAVE_PLTE; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 649 | } |
| 650 | |
| 651 | /* write an IDAT chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 652 | void /* PRIVATE */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 653 | png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 654 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 655 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 656 | PNG_IDAT; |
| 657 | #endif |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 658 | png_debug(1, "in png_write_IDAT"); |
Glenn Randers-Pehrson | 5b5dcf8 | 2004-07-17 22:45:44 -0500 | [diff] [blame] | 659 | |
Glenn Randers-Pehrson | 5b77916 | 2004-09-04 13:25:08 -0500 | [diff] [blame] | 660 | /* Optimize the CMF field in the zlib stream. */ |
| 661 | /* This hack of the zlib stream is compliant to the stream specification. */ |
| 662 | if (!(png_ptr->mode & PNG_HAVE_IDAT) && |
| 663 | png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE) |
| 664 | { |
| 665 | unsigned int z_cmf = data[0]; /* zlib compression method and flags */ |
| 666 | if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70) |
| 667 | { |
| 668 | /* Avoid memory underflows and multiplication overflows. */ |
| 669 | /* The conditions below are practically always satisfied; |
| 670 | however, they still must be checked. */ |
| 671 | if (length >= 2 && |
| 672 | png_ptr->height < 16384 && png_ptr->width < 16384) |
| 673 | { |
| 674 | png_uint_32 uncompressed_idat_size = png_ptr->height * |
| 675 | ((png_ptr->width * |
| 676 | png_ptr->channels * png_ptr->bit_depth + 15) >> 3); |
| 677 | unsigned int z_cinfo = z_cmf >> 4; |
| 678 | unsigned int half_z_window_size = 1 << (z_cinfo + 7); |
| 679 | while (uncompressed_idat_size <= half_z_window_size && |
| 680 | half_z_window_size >= 256) |
| 681 | { |
| 682 | z_cinfo--; |
| 683 | half_z_window_size >>= 1; |
| 684 | } |
| 685 | z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4); |
| 686 | if (data[0] != (png_byte)z_cmf) |
| 687 | { |
| 688 | data[0] = (png_byte)z_cmf; |
| 689 | data[1] &= 0xe0; |
| 690 | data[1] += (png_byte)(0x1f - ((z_cmf << 8) + data[1]) % 0x1f); |
| 691 | } |
| 692 | } |
| 693 | } |
| 694 | else |
| 695 | png_error(png_ptr, |
| 696 | "Invalid zlib compression method or flags in IDAT"); |
| 697 | } |
| 698 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 699 | png_write_chunk(png_ptr, (png_bytep)png_IDAT, data, length); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 700 | png_ptr->mode |= PNG_HAVE_IDAT; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 701 | } |
| 702 | |
| 703 | /* write an IEND chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 704 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 705 | png_write_IEND(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 706 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 707 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 708 | PNG_IEND; |
| 709 | #endif |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 710 | png_debug(1, "in png_write_IEND"); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 711 | png_write_chunk(png_ptr, (png_bytep)png_IEND, NULL, |
| 712 | (png_size_t)0); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 713 | png_ptr->mode |= PNG_HAVE_IEND; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 714 | } |
| 715 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 716 | #if defined(PNG_WRITE_gAMA_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 717 | /* write a gAMA chunk */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 718 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 719 | void /* PRIVATE */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 720 | png_write_gAMA(png_structp png_ptr, double file_gamma) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 721 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 722 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 723 | PNG_gAMA; |
| 724 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 725 | png_uint_32 igamma; |
| 726 | png_byte buf[4]; |
| 727 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 728 | png_debug(1, "in png_write_gAMA"); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 729 | /* file_gamma is saved in 1/100,000ths */ |
Glenn Randers-Pehrson | 397100e | 1998-03-07 19:45:37 -0600 | [diff] [blame] | 730 | igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 731 | png_save_uint_32(buf, igamma); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 732 | png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 733 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 734 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 735 | #ifdef PNG_FIXED_POINT_SUPPORTED |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 736 | void /* PRIVATE */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 737 | png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 738 | { |
| 739 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 740 | PNG_gAMA; |
| 741 | #endif |
| 742 | png_byte buf[4]; |
| 743 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 744 | png_debug(1, "in png_write_gAMA"); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 745 | /* file_gamma is saved in 1/100,000ths */ |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 746 | png_save_uint_32(buf, (png_uint_32)file_gamma); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 747 | png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 748 | } |
| 749 | #endif |
| 750 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 751 | |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 752 | #if defined(PNG_WRITE_sRGB_SUPPORTED) |
| 753 | /* write a sRGB chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 754 | void /* PRIVATE */ |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 755 | png_write_sRGB(png_structp png_ptr, int srgb_intent) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 756 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 757 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 758 | PNG_sRGB; |
| 759 | #endif |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 760 | png_byte buf[1]; |
| 761 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 762 | png_debug(1, "in png_write_sRGB"); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 763 | if (srgb_intent >= PNG_sRGB_INTENT_LAST) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 764 | png_warning(png_ptr, |
| 765 | "Invalid sRGB rendering intent specified"); |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 766 | buf[0]=(png_byte)srgb_intent; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 767 | png_write_chunk(png_ptr, (png_bytep)png_sRGB, buf, (png_size_t)1); |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 768 | } |
| 769 | #endif |
| 770 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 771 | #if defined(PNG_WRITE_iCCP_SUPPORTED) |
| 772 | /* write an iCCP chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 773 | void /* PRIVATE */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 774 | png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type, |
| 775 | png_charp profile, int profile_len) |
| 776 | { |
| 777 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 778 | PNG_iCCP; |
| 779 | #endif |
| 780 | png_size_t name_len; |
| 781 | png_charp new_name; |
| 782 | compression_state comp; |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 783 | int embedded_profile_len = 0; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 784 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 785 | png_debug(1, "in png_write_iCCP"); |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 786 | |
| 787 | comp.num_output_ptr = 0; |
| 788 | comp.max_output_ptr = 0; |
| 789 | comp.output_ptr = NULL; |
| 790 | comp.input = NULL; |
| 791 | comp.input_len = 0; |
| 792 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 793 | if (name == NULL || (name_len = png_check_keyword(png_ptr, name, |
| 794 | &new_name)) == 0) |
| 795 | { |
| 796 | png_warning(png_ptr, "Empty keyword in iCCP chunk"); |
| 797 | return; |
| 798 | } |
| 799 | |
Glenn Randers-Pehrson | 76e5fd6 | 2000-12-28 07:50:05 -0600 | [diff] [blame] | 800 | if (compression_type != PNG_COMPRESSION_TYPE_BASE) |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 801 | png_warning(png_ptr, "Unknown compression type in iCCP chunk"); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 802 | |
Glenn Randers-Pehrson | 1394480 | 2000-06-24 07:42:42 -0500 | [diff] [blame] | 803 | if (profile == NULL) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 804 | profile_len = 0; |
| 805 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 806 | if (profile_len > 3) |
Glenn Randers-Pehrson | 7edd458 | 2006-12-07 19:16:44 -0600 | [diff] [blame] | 807 | embedded_profile_len = |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 808 | ((*( (png_bytep)profile ))<<24) | |
| 809 | ((*( (png_bytep)profile + 1))<<16) | |
| 810 | ((*( (png_bytep)profile + 2))<< 8) | |
| 811 | ((*( (png_bytep)profile + 3)) ); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 812 | |
| 813 | if (profile_len < embedded_profile_len) |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 814 | { |
| 815 | png_warning(png_ptr, |
| 816 | "Embedded profile length too large in iCCP chunk"); |
| 817 | return; |
| 818 | } |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 819 | |
| 820 | if (profile_len > embedded_profile_len) |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 821 | { |
| 822 | png_warning(png_ptr, |
| 823 | "Truncating profile to actual length in iCCP chunk"); |
| 824 | profile_len = embedded_profile_len; |
| 825 | } |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 826 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 827 | if (profile_len) |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 828 | profile_len = png_text_compress(png_ptr, profile, |
| 829 | (png_size_t)profile_len, PNG_COMPRESSION_TYPE_BASE, &comp); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 830 | |
| 831 | /* make sure we include the NULL after the name and the compression type */ |
| 832 | png_write_chunk_start(png_ptr, (png_bytep)png_iCCP, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 833 | (png_uint_32)(name_len + profile_len + 2)); |
| 834 | new_name[name_len + 1] = 0x00; |
| 835 | png_write_chunk_data(png_ptr, (png_bytep)new_name, |
| 836 | (png_size_t)(name_len + 2)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 837 | |
| 838 | if (profile_len) |
| 839 | png_write_compressed_data_out(png_ptr, &comp); |
| 840 | |
| 841 | png_write_chunk_end(png_ptr); |
| 842 | png_free(png_ptr, new_name); |
| 843 | } |
| 844 | #endif |
| 845 | |
| 846 | #if defined(PNG_WRITE_sPLT_SUPPORTED) |
| 847 | /* write a sPLT chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 848 | void /* PRIVATE */ |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 849 | png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 850 | { |
| 851 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 852 | PNG_sPLT; |
| 853 | #endif |
| 854 | png_size_t name_len; |
| 855 | png_charp new_name; |
| 856 | png_byte entrybuf[10]; |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 857 | png_size_t entry_size = (spalette->depth == 8 ? 6 : 10); |
| 858 | png_size_t palette_size = entry_size * spalette->nentries; |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 859 | png_sPLT_entryp ep; |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 860 | #ifdef PNG_NO_POINTER_INDEXING |
| 861 | int i; |
| 862 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 863 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 864 | png_debug(1, "in png_write_sPLT"); |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 865 | if (spalette->name == NULL || (name_len = png_check_keyword(png_ptr, |
| 866 | spalette->name, &new_name))==0) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 867 | { |
| 868 | png_warning(png_ptr, "Empty keyword in sPLT chunk"); |
| 869 | return; |
| 870 | } |
| 871 | |
| 872 | /* make sure we include the NULL after the name */ |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 873 | png_write_chunk_start(png_ptr, (png_bytep)png_sPLT, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 874 | (png_uint_32)(name_len + 2 + palette_size)); |
| 875 | png_write_chunk_data(png_ptr, (png_bytep)new_name, |
| 876 | (png_size_t)(name_len + 1)); |
| 877 | png_write_chunk_data(png_ptr, (png_bytep)&spalette->depth, (png_size_t)1); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 878 | |
| 879 | /* loop through each palette entry, writing appropriately */ |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 880 | #ifndef PNG_NO_POINTER_INDEXING |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 881 | for (ep = spalette->entries; ep<spalette->entries + spalette->nentries; ep++) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 882 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 883 | if (spalette->depth == 8) |
| 884 | { |
| 885 | entrybuf[0] = (png_byte)ep->red; |
| 886 | entrybuf[1] = (png_byte)ep->green; |
| 887 | entrybuf[2] = (png_byte)ep->blue; |
| 888 | entrybuf[3] = (png_byte)ep->alpha; |
| 889 | png_save_uint_16(entrybuf + 4, ep->frequency); |
| 890 | } |
| 891 | else |
| 892 | { |
| 893 | png_save_uint_16(entrybuf + 0, ep->red); |
| 894 | png_save_uint_16(entrybuf + 2, ep->green); |
| 895 | png_save_uint_16(entrybuf + 4, ep->blue); |
| 896 | png_save_uint_16(entrybuf + 6, ep->alpha); |
| 897 | png_save_uint_16(entrybuf + 8, ep->frequency); |
| 898 | } |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 899 | png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 900 | } |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 901 | #else |
| 902 | ep=spalette->entries; |
| 903 | for (i=0; i>spalette->nentries; i++) |
| 904 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 905 | if (spalette->depth == 8) |
| 906 | { |
| 907 | entrybuf[0] = (png_byte)ep[i].red; |
| 908 | entrybuf[1] = (png_byte)ep[i].green; |
| 909 | entrybuf[2] = (png_byte)ep[i].blue; |
| 910 | entrybuf[3] = (png_byte)ep[i].alpha; |
| 911 | png_save_uint_16(entrybuf + 4, ep[i].frequency); |
| 912 | } |
| 913 | else |
| 914 | { |
| 915 | png_save_uint_16(entrybuf + 0, ep[i].red); |
| 916 | png_save_uint_16(entrybuf + 2, ep[i].green); |
| 917 | png_save_uint_16(entrybuf + 4, ep[i].blue); |
| 918 | png_save_uint_16(entrybuf + 6, ep[i].alpha); |
| 919 | png_save_uint_16(entrybuf + 8, ep[i].frequency); |
| 920 | } |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 921 | png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size); |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 922 | } |
| 923 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 924 | |
| 925 | png_write_chunk_end(png_ptr); |
| 926 | png_free(png_ptr, new_name); |
| 927 | } |
| 928 | #endif |
| 929 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 930 | #if defined(PNG_WRITE_sBIT_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 931 | /* write the sBIT chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 932 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 933 | png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 934 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 935 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 936 | PNG_sBIT; |
| 937 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 938 | png_byte buf[4]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 939 | png_size_t size; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 940 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 941 | png_debug(1, "in png_write_sBIT"); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 942 | /* 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] | 943 | if (color_type & PNG_COLOR_MASK_COLOR) |
| 944 | { |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 945 | png_byte maxbits; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 946 | |
Glenn Randers-Pehrson | 860ab2b | 1999-10-14 07:43:10 -0500 | [diff] [blame] | 947 | maxbits = (png_byte)(color_type==PNG_COLOR_TYPE_PALETTE ? 8 : |
| 948 | png_ptr->usr_bit_depth); |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 949 | if (sbit->red == 0 || sbit->red > maxbits || |
| 950 | sbit->green == 0 || sbit->green > maxbits || |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 951 | sbit->blue == 0 || sbit->blue > maxbits) |
| 952 | { |
| 953 | png_warning(png_ptr, "Invalid sBIT depth specified"); |
| 954 | return; |
| 955 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 956 | buf[0] = sbit->red; |
| 957 | buf[1] = sbit->green; |
| 958 | buf[2] = sbit->blue; |
| 959 | size = 3; |
| 960 | } |
| 961 | else |
| 962 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 963 | if (sbit->gray == 0 || sbit->gray > png_ptr->usr_bit_depth) |
| 964 | { |
| 965 | png_warning(png_ptr, "Invalid sBIT depth specified"); |
| 966 | return; |
| 967 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 968 | buf[0] = sbit->gray; |
| 969 | size = 1; |
| 970 | } |
| 971 | |
| 972 | if (color_type & PNG_COLOR_MASK_ALPHA) |
| 973 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 974 | if (sbit->alpha == 0 || sbit->alpha > png_ptr->usr_bit_depth) |
| 975 | { |
| 976 | png_warning(png_ptr, "Invalid sBIT depth specified"); |
| 977 | return; |
| 978 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 979 | buf[size++] = sbit->alpha; |
| 980 | } |
| 981 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 982 | png_write_chunk(png_ptr, (png_bytep)png_sBIT, buf, size); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 983 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 984 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 985 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 986 | #if defined(PNG_WRITE_cHRM_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 987 | /* write the cHRM chunk */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 988 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 989 | void /* PRIVATE */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 990 | png_write_cHRM(png_structp png_ptr, double white_x, double white_y, |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 991 | double red_x, double red_y, double green_x, double green_y, |
| 992 | double blue_x, double blue_y) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 993 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 994 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 995 | PNG_cHRM; |
| 996 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 997 | png_byte buf[32]; |
Glenn Randers-Pehrson | 02a5e33 | 2008-11-24 22:10:23 -0600 | [diff] [blame] | 998 | |
| 999 | png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, |
| 1000 | int_green_x, int_green_y, int_blue_x, int_blue_y; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1001 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1002 | png_debug(1, "in png_write_cHRM"); |
Glenn Randers-Pehrson | 02a5e33 | 2008-11-24 22:10:23 -0600 | [diff] [blame] | 1003 | |
| 1004 | int_white_x = (png_uint_32)(white_x * 100000.0 + 0.5); |
| 1005 | int_white_y = (png_uint_32)(white_y * 100000.0 + 0.5); |
| 1006 | int_red_x = (png_uint_32)(red_x * 100000.0 + 0.5); |
| 1007 | int_red_y = (png_uint_32)(red_y * 100000.0 + 0.5); |
| 1008 | int_green_x = (png_uint_32)(green_x * 100000.0 + 0.5); |
| 1009 | int_green_y = (png_uint_32)(green_y * 100000.0 + 0.5); |
| 1010 | int_blue_x = (png_uint_32)(blue_x * 100000.0 + 0.5); |
| 1011 | int_blue_y = (png_uint_32)(blue_y * 100000.0 + 0.5); |
| 1012 | |
Glenn Randers-Pehrson | 71a3c1f | 2008-11-26 12:00:38 -0600 | [diff] [blame^] | 1013 | #if !defined(PNG_NO_CHECK_cHRM) |
Glenn Randers-Pehrson | 02a5e33 | 2008-11-24 22:10:23 -0600 | [diff] [blame] | 1014 | if (png_check_cHRM_fixed(png_ptr, int_white_x, int_white_y, |
| 1015 | int_red_x, int_red_y, int_green_x, int_green_y, int_blue_x, int_blue_y)) |
Glenn Randers-Pehrson | 71a3c1f | 2008-11-26 12:00:38 -0600 | [diff] [blame^] | 1016 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1017 | { |
Glenn Randers-Pehrson | 02a5e33 | 2008-11-24 22:10:23 -0600 | [diff] [blame] | 1018 | /* each value is saved in 1/100,000ths */ |
| 1019 | |
| 1020 | png_save_uint_32(buf, int_white_x); |
| 1021 | png_save_uint_32(buf + 4, int_white_y); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1022 | |
Glenn Randers-Pehrson | 02a5e33 | 2008-11-24 22:10:23 -0600 | [diff] [blame] | 1023 | png_save_uint_32(buf + 8, int_red_x); |
| 1024 | png_save_uint_32(buf + 12, int_red_y); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1025 | |
Glenn Randers-Pehrson | 02a5e33 | 2008-11-24 22:10:23 -0600 | [diff] [blame] | 1026 | png_save_uint_32(buf + 16, int_green_x); |
| 1027 | png_save_uint_32(buf + 20, int_green_y); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1028 | |
Glenn Randers-Pehrson | 02a5e33 | 2008-11-24 22:10:23 -0600 | [diff] [blame] | 1029 | png_save_uint_32(buf + 24, int_blue_x); |
| 1030 | png_save_uint_32(buf + 28, int_blue_y); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1031 | |
Glenn Randers-Pehrson | 02a5e33 | 2008-11-24 22:10:23 -0600 | [diff] [blame] | 1032 | png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32); |
Glenn Randers-Pehrson | f783101 | 2008-11-13 06:05:13 -0600 | [diff] [blame] | 1033 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1034 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1035 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1036 | #ifdef PNG_FIXED_POINT_SUPPORTED |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1037 | void /* PRIVATE */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1038 | png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x, |
| 1039 | png_fixed_point white_y, png_fixed_point red_x, png_fixed_point red_y, |
| 1040 | png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x, |
| 1041 | png_fixed_point blue_y) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1042 | { |
| 1043 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1044 | PNG_cHRM; |
| 1045 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1046 | png_byte buf[32]; |
| 1047 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1048 | png_debug(1, "in png_write_cHRM"); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1049 | /* each value is saved in 1/100,000ths */ |
Glenn Randers-Pehrson | 71a3c1f | 2008-11-26 12:00:38 -0600 | [diff] [blame^] | 1050 | #if !defined(PNG_NO_CHECK_cHRM) |
Glenn Randers-Pehrson | f783101 | 2008-11-13 06:05:13 -0600 | [diff] [blame] | 1051 | if (png_check_cHRM_fixed(png_ptr, white_x, white_y, red_x, red_y, |
| 1052 | green_x, green_y, blue_x, blue_y)) |
Glenn Randers-Pehrson | 71a3c1f | 2008-11-26 12:00:38 -0600 | [diff] [blame^] | 1053 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1054 | { |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 1055 | png_save_uint_32(buf, (png_uint_32)white_x); |
| 1056 | png_save_uint_32(buf + 4, (png_uint_32)white_y); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1057 | |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 1058 | png_save_uint_32(buf + 8, (png_uint_32)red_x); |
| 1059 | png_save_uint_32(buf + 12, (png_uint_32)red_y); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1060 | |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 1061 | png_save_uint_32(buf + 16, (png_uint_32)green_x); |
| 1062 | png_save_uint_32(buf + 20, (png_uint_32)green_y); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1063 | |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 1064 | png_save_uint_32(buf + 24, (png_uint_32)blue_x); |
| 1065 | png_save_uint_32(buf + 28, (png_uint_32)blue_y); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1066 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1067 | png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32); |
Glenn Randers-Pehrson | f783101 | 2008-11-13 06:05:13 -0600 | [diff] [blame] | 1068 | } |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1069 | } |
| 1070 | #endif |
| 1071 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1072 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1073 | #if defined(PNG_WRITE_tRNS_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1074 | /* write the tRNS chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1075 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1076 | png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran, |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1077 | int num_trans, int color_type) |
| 1078 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1079 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1080 | PNG_tRNS; |
| 1081 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1082 | png_byte buf[6]; |
| 1083 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1084 | png_debug(1, "in png_write_tRNS"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1085 | if (color_type == PNG_COLOR_TYPE_PALETTE) |
| 1086 | { |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1087 | if (num_trans <= 0 || num_trans > (int)png_ptr->num_palette) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1088 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1089 | png_warning(png_ptr, "Invalid number of transparent colors specified"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1090 | return; |
| 1091 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1092 | /* write the chunk out as it is */ |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1093 | png_write_chunk(png_ptr, (png_bytep)png_tRNS, trans, |
| 1094 | (png_size_t)num_trans); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1095 | } |
| 1096 | else if (color_type == PNG_COLOR_TYPE_GRAY) |
| 1097 | { |
| 1098 | /* one 16 bit value */ |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1099 | if (tran->gray >= (1 << png_ptr->bit_depth)) |
Glenn Randers-Pehrson | 1ea0ff3 | 2001-08-07 22:25:59 -0500 | [diff] [blame] | 1100 | { |
| 1101 | png_warning(png_ptr, |
| 1102 | "Ignoring attempt to write tRNS chunk out-of-range for bit_depth"); |
| 1103 | return; |
| 1104 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1105 | png_save_uint_16(buf, tran->gray); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1106 | png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)2); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1107 | } |
| 1108 | else if (color_type == PNG_COLOR_TYPE_RGB) |
| 1109 | { |
| 1110 | /* three 16 bit values */ |
| 1111 | png_save_uint_16(buf, tran->red); |
| 1112 | png_save_uint_16(buf + 2, tran->green); |
| 1113 | png_save_uint_16(buf + 4, tran->blue); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1114 | if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4])) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1115 | { |
| 1116 | png_warning(png_ptr, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1117 | "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] | 1118 | return; |
| 1119 | } |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1120 | png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)6); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1121 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1122 | else |
| 1123 | { |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1124 | png_warning(png_ptr, "Can't write tRNS with an alpha channel"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1125 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1126 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1127 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1128 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1129 | #if defined(PNG_WRITE_bKGD_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1130 | /* write the background chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1131 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1132 | png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1133 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1134 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1135 | PNG_bKGD; |
| 1136 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1137 | png_byte buf[6]; |
| 1138 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1139 | png_debug(1, "in png_write_bKGD"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1140 | if (color_type == PNG_COLOR_TYPE_PALETTE) |
| 1141 | { |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1142 | if ( |
Glenn Randers-Pehrson | 1fd5fb3 | 2001-05-06 05:34:26 -0500 | [diff] [blame] | 1143 | #if defined(PNG_MNG_FEATURES_SUPPORTED) |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 1144 | (png_ptr->num_palette || |
| 1145 | (!(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE))) && |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1146 | #endif |
| 1147 | back->index > png_ptr->num_palette) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1148 | { |
| 1149 | png_warning(png_ptr, "Invalid background palette index"); |
| 1150 | return; |
| 1151 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1152 | buf[0] = back->index; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1153 | png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)1); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1154 | } |
| 1155 | else if (color_type & PNG_COLOR_MASK_COLOR) |
| 1156 | { |
| 1157 | png_save_uint_16(buf, back->red); |
| 1158 | png_save_uint_16(buf + 2, back->green); |
| 1159 | png_save_uint_16(buf + 4, back->blue); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1160 | if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4])) |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1161 | { |
| 1162 | png_warning(png_ptr, |
| 1163 | "Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8"); |
| 1164 | return; |
| 1165 | } |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1166 | png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)6); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1167 | } |
| 1168 | else |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1169 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1170 | if (back->gray >= (1 << png_ptr->bit_depth)) |
Glenn Randers-Pehrson | 1ea0ff3 | 2001-08-07 22:25:59 -0500 | [diff] [blame] | 1171 | { |
| 1172 | png_warning(png_ptr, |
| 1173 | "Ignoring attempt to write bKGD chunk out-of-range for bit_depth"); |
| 1174 | return; |
| 1175 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1176 | png_save_uint_16(buf, back->gray); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1177 | png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)2); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1178 | } |
| 1179 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1180 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1181 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1182 | #if defined(PNG_WRITE_hIST_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1183 | /* write the histogram */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1184 | void /* PRIVATE */ |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1185 | png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1186 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1187 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1188 | PNG_hIST; |
| 1189 | #endif |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1190 | int i; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1191 | png_byte buf[3]; |
| 1192 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1193 | png_debug(1, "in png_write_hIST"); |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1194 | if (num_hist > (int)png_ptr->num_palette) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1195 | { |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1196 | png_debug2(3, "num_hist = %d, num_palette = %d", num_hist, |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1197 | png_ptr->num_palette); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1198 | png_warning(png_ptr, "Invalid number of histogram entries specified"); |
| 1199 | return; |
| 1200 | } |
| 1201 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1202 | png_write_chunk_start(png_ptr, (png_bytep)png_hIST, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1203 | (png_uint_32)(num_hist * 2)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1204 | for (i = 0; i < num_hist; i++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1205 | { |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1206 | png_save_uint_16(buf, hist[i]); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1207 | png_write_chunk_data(png_ptr, buf, (png_size_t)2); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1208 | } |
| 1209 | png_write_chunk_end(png_ptr); |
| 1210 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1211 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1212 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1213 | #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ |
| 1214 | defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1215 | /* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification, |
| 1216 | * and if invalid, correct the keyword rather than discarding the entire |
| 1217 | * chunk. The PNG 1.0 specification requires keywords 1-79 characters in |
| 1218 | * length, forbids leading or trailing whitespace, multiple internal spaces, |
| 1219 | * and the non-break space (0x80) from ISO 8859-1. Returns keyword length. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1220 | * |
| 1221 | * The new_key is allocated to hold the corrected keyword and must be freed |
| 1222 | * by the calling routine. This avoids problems with trying to write to |
| 1223 | * static keywords without having to have duplicate copies of the strings. |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1224 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1225 | png_size_t /* PRIVATE */ |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1226 | png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1227 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1228 | png_size_t key_len; |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1229 | png_charp kp, dp; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1230 | int kflag; |
Glenn Randers-Pehrson | f6b4f45 | 2000-12-01 09:23:06 -0600 | [diff] [blame] | 1231 | int kwarn=0; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1232 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1233 | png_debug(1, "in png_check_keyword"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1234 | *new_key = NULL; |
| 1235 | |
| 1236 | if (key == NULL || (key_len = png_strlen(key)) == 0) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1237 | { |
Glenn Randers-Pehrson | f6b4f45 | 2000-12-01 09:23:06 -0600 | [diff] [blame] | 1238 | png_warning(png_ptr, "zero length keyword"); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1239 | return ((png_size_t)0); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1240 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1241 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1242 | png_debug1(2, "Keyword to be checked is '%s'", key); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1243 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1244 | *new_key = (png_charp)png_malloc_warn(png_ptr, (png_uint_32)(key_len + 2)); |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 1245 | if (*new_key == NULL) |
| 1246 | { |
| 1247 | png_warning(png_ptr, "Out of memory while procesing keyword"); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1248 | return ((png_size_t)0); |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 1249 | } |
Glenn Randers-Pehrson | e68f5a3 | 2001-05-14 09:20:53 -0500 | [diff] [blame] | 1250 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1251 | /* Replace non-printing characters with a blank and print a warning */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1252 | for (kp = key, dp = *new_key; *kp != '\0'; kp++, dp++) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1253 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1254 | if ((png_byte)*kp < 0x20 || |
| 1255 | ((png_byte)*kp > 0x7E && (png_byte)*kp < 0xA1)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1256 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1257 | #if !defined(PNG_NO_STDIO) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1258 | char msg[40]; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1259 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1260 | png_snprintf(msg, 40, |
| 1261 | "invalid keyword character 0x%02X", (png_byte)*kp); |
Glenn Randers-Pehrson | f6b4f45 | 2000-12-01 09:23:06 -0600 | [diff] [blame] | 1262 | png_warning(png_ptr, msg); |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1263 | #else |
Glenn Randers-Pehrson | f6b4f45 | 2000-12-01 09:23:06 -0600 | [diff] [blame] | 1264 | png_warning(png_ptr, "invalid character in keyword"); |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1265 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1266 | *dp = ' '; |
| 1267 | } |
| 1268 | else |
| 1269 | { |
| 1270 | *dp = *kp; |
| 1271 | } |
| 1272 | } |
| 1273 | *dp = '\0'; |
| 1274 | |
| 1275 | /* Remove any trailing white space. */ |
| 1276 | kp = *new_key + key_len - 1; |
| 1277 | if (*kp == ' ') |
| 1278 | { |
Glenn Randers-Pehrson | f6b4f45 | 2000-12-01 09:23:06 -0600 | [diff] [blame] | 1279 | png_warning(png_ptr, "trailing spaces removed from keyword"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1280 | |
| 1281 | while (*kp == ' ') |
| 1282 | { |
| 1283 | *(kp--) = '\0'; |
| 1284 | key_len--; |
| 1285 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1286 | } |
| 1287 | |
| 1288 | /* Remove any leading white space. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1289 | kp = *new_key; |
| 1290 | if (*kp == ' ') |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1291 | { |
Glenn Randers-Pehrson | f6b4f45 | 2000-12-01 09:23:06 -0600 | [diff] [blame] | 1292 | png_warning(png_ptr, "leading spaces removed from keyword"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1293 | |
| 1294 | while (*kp == ' ') |
| 1295 | { |
| 1296 | kp++; |
| 1297 | key_len--; |
| 1298 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1299 | } |
| 1300 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1301 | png_debug1(2, "Checking for multiple internal spaces in '%s'", kp); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1302 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1303 | /* Remove multiple internal spaces. */ |
| 1304 | for (kflag = 0, dp = *new_key; *kp != '\0'; kp++) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1305 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1306 | if (*kp == ' ' && kflag == 0) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1307 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1308 | *(dp++) = *kp; |
| 1309 | kflag = 1; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1310 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1311 | else if (*kp == ' ') |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1312 | { |
| 1313 | key_len--; |
Glenn Randers-Pehrson | f6b4f45 | 2000-12-01 09:23:06 -0600 | [diff] [blame] | 1314 | kwarn=1; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1315 | } |
| 1316 | else |
| 1317 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1318 | *(dp++) = *kp; |
| 1319 | kflag = 0; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1320 | } |
| 1321 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1322 | *dp = '\0'; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1323 | if (kwarn) |
Glenn Randers-Pehrson | f6b4f45 | 2000-12-01 09:23:06 -0600 | [diff] [blame] | 1324 | png_warning(png_ptr, "extra interior spaces removed from keyword"); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1325 | |
| 1326 | if (key_len == 0) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1327 | { |
Glenn Randers-Pehrson | 6d8f3b0 | 1999-10-23 08:39:18 -0500 | [diff] [blame] | 1328 | png_free(png_ptr, *new_key); |
Glenn Randers-Pehrson | f6b4f45 | 2000-12-01 09:23:06 -0600 | [diff] [blame] | 1329 | png_warning(png_ptr, "Zero length keyword"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1330 | } |
| 1331 | |
| 1332 | if (key_len > 79) |
| 1333 | { |
Glenn Randers-Pehrson | f6b4f45 | 2000-12-01 09:23:06 -0600 | [diff] [blame] | 1334 | png_warning(png_ptr, "keyword length must be 1 - 79 characters"); |
Glenn Randers-Pehrson | 71a3c1f | 2008-11-26 12:00:38 -0600 | [diff] [blame^] | 1335 | (*new_key)[79] = '\0'; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1336 | key_len = 79; |
| 1337 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1338 | |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 1339 | return (key_len); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1340 | } |
| 1341 | #endif |
| 1342 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1343 | #if defined(PNG_WRITE_tEXt_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1344 | /* write a tEXt chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1345 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1346 | png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text, |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1347 | png_size_t text_len) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1348 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1349 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1350 | PNG_tEXt; |
| 1351 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1352 | png_size_t key_len; |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1353 | png_charp new_key; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1354 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1355 | png_debug(1, "in png_write_tEXt"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1356 | if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0) |
| 1357 | { |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1358 | png_warning(png_ptr, "Empty keyword in tEXt chunk"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1359 | return; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1360 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1361 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1362 | if (text == NULL || *text == '\0') |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1363 | text_len = 0; |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1364 | else |
| 1365 | text_len = png_strlen(text); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1366 | |
| 1367 | /* make sure we include the 0 after the key */ |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1368 | png_write_chunk_start(png_ptr, (png_bytep)png_tEXt, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1369 | (png_uint_32)(key_len + text_len + 1)); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1370 | /* |
| 1371 | * We leave it to the application to meet PNG-1.0 requirements on the |
| 1372 | * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of |
| 1373 | * 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] | 1374 | * 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] | 1375 | */ |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1376 | png_write_chunk_data(png_ptr, (png_bytep)new_key, |
| 1377 | (png_size_t)(key_len + 1)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1378 | if (text_len) |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1379 | png_write_chunk_data(png_ptr, (png_bytep)text, (png_size_t)text_len); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1380 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1381 | png_write_chunk_end(png_ptr); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1382 | png_free(png_ptr, new_key); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1383 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1384 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1385 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1386 | #if defined(PNG_WRITE_zTXt_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1387 | /* write a compressed text chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1388 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1389 | png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text, |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1390 | png_size_t text_len, int compression) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1391 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1392 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1393 | PNG_zTXt; |
| 1394 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1395 | png_size_t key_len; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1396 | char buf[1]; |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1397 | png_charp new_key; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1398 | compression_state comp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1399 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1400 | png_debug(1, "in png_write_zTXt"); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1401 | |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 1402 | comp.num_output_ptr = 0; |
| 1403 | comp.max_output_ptr = 0; |
| 1404 | comp.output_ptr = NULL; |
| 1405 | comp.input = NULL; |
| 1406 | comp.input_len = 0; |
| 1407 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1408 | if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1409 | { |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1410 | png_warning(png_ptr, "Empty keyword in zTXt chunk"); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1411 | png_free(png_ptr, new_key); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1412 | return; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1413 | } |
| 1414 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1415 | if (text == NULL || *text == '\0' || compression==PNG_TEXT_COMPRESSION_NONE) |
| 1416 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1417 | png_write_tEXt(png_ptr, new_key, text, (png_size_t)0); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1418 | png_free(png_ptr, new_key); |
| 1419 | return; |
| 1420 | } |
| 1421 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1422 | text_len = png_strlen(text); |
| 1423 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1424 | /* compute the compressed data; do it now for the length */ |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1425 | text_len = png_text_compress(png_ptr, text, text_len, compression, |
| 1426 | &comp); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1427 | |
| 1428 | /* write start of chunk */ |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1429 | png_write_chunk_start(png_ptr, (png_bytep)png_zTXt, |
| 1430 | (png_uint_32)(key_len+text_len + 2)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1431 | /* write key */ |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1432 | png_write_chunk_data(png_ptr, (png_bytep)new_key, |
| 1433 | (png_size_t)(key_len + 1)); |
| 1434 | png_free(png_ptr, new_key); |
| 1435 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1436 | buf[0] = (png_byte)compression; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1437 | /* write compression */ |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1438 | png_write_chunk_data(png_ptr, (png_bytep)buf, (png_size_t)1); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1439 | /* write the compressed data */ |
| 1440 | png_write_compressed_data_out(png_ptr, &comp); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1441 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1442 | /* close the chunk */ |
| 1443 | png_write_chunk_end(png_ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1444 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1445 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1446 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1447 | #if defined(PNG_WRITE_iTXt_SUPPORTED) |
| 1448 | /* write an iTXt chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1449 | void /* PRIVATE */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1450 | png_write_iTXt(png_structp png_ptr, int compression, png_charp key, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1451 | png_charp lang, png_charp lang_key, png_charp text) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1452 | { |
| 1453 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1454 | PNG_iTXt; |
| 1455 | #endif |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1456 | png_size_t lang_len, key_len, lang_key_len, text_len; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1457 | png_charp new_lang, new_key; |
| 1458 | png_byte cbuf[2]; |
| 1459 | compression_state comp; |
| 1460 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1461 | png_debug(1, "in png_write_iTXt"); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1462 | |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 1463 | comp.num_output_ptr = 0; |
| 1464 | comp.max_output_ptr = 0; |
| 1465 | comp.output_ptr = NULL; |
| 1466 | comp.input = NULL; |
| 1467 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1468 | if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0) |
| 1469 | { |
| 1470 | png_warning(png_ptr, "Empty keyword in iTXt chunk"); |
| 1471 | return; |
| 1472 | } |
Glenn Randers-Pehrson | 73d57cb | 2002-03-25 18:49:08 -0600 | [diff] [blame] | 1473 | if (lang == NULL || (lang_len = png_check_keyword(png_ptr, lang, &new_lang))==0) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1474 | { |
| 1475 | png_warning(png_ptr, "Empty language field in iTXt chunk"); |
Glenn Randers-Pehrson | 73d57cb | 2002-03-25 18:49:08 -0600 | [diff] [blame] | 1476 | new_lang = NULL; |
Glenn Randers-Pehrson | 5b5dcf8 | 2004-07-17 22:45:44 -0500 | [diff] [blame] | 1477 | lang_len = 0; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1478 | } |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1479 | |
Glenn Randers-Pehrson | 73d57cb | 2002-03-25 18:49:08 -0600 | [diff] [blame] | 1480 | if (lang_key == NULL) |
| 1481 | lang_key_len = 0; |
| 1482 | else |
| 1483 | lang_key_len = png_strlen(lang_key); |
| 1484 | |
| 1485 | if (text == NULL) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1486 | text_len = 0; |
Glenn Randers-Pehrson | 73d57cb | 2002-03-25 18:49:08 -0600 | [diff] [blame] | 1487 | else |
| 1488 | text_len = png_strlen(text); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1489 | |
| 1490 | /* compute the compressed data; do it now for the length */ |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1491 | text_len = png_text_compress(png_ptr, text, text_len, compression-2, |
| 1492 | &comp); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1493 | |
Glenn Randers-Pehrson | 73d57cb | 2002-03-25 18:49:08 -0600 | [diff] [blame] | 1494 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1495 | /* make sure we include the compression flag, the compression byte, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1496 | * and the NULs after the key, lang, and lang_key parts */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1497 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1498 | png_write_chunk_start(png_ptr, (png_bytep)png_iTXt, |
| 1499 | (png_uint_32)( |
| 1500 | 5 /* comp byte, comp flag, terminators for key, lang and lang_key */ |
| 1501 | + key_len |
| 1502 | + lang_len |
| 1503 | + lang_key_len |
| 1504 | + text_len)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1505 | |
| 1506 | /* |
| 1507 | * We leave it to the application to meet PNG-1.0 requirements on the |
| 1508 | * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of |
| 1509 | * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them. |
| 1510 | * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG. |
| 1511 | */ |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1512 | png_write_chunk_data(png_ptr, (png_bytep)new_key, |
| 1513 | (png_size_t)(key_len + 1)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1514 | |
| 1515 | /* set the compression flag */ |
| 1516 | if (compression == PNG_ITXT_COMPRESSION_NONE || \ |
| 1517 | compression == PNG_TEXT_COMPRESSION_NONE) |
| 1518 | cbuf[0] = 0; |
| 1519 | else /* compression == PNG_ITXT_COMPRESSION_zTXt */ |
| 1520 | cbuf[0] = 1; |
| 1521 | /* set the compression method */ |
| 1522 | cbuf[1] = 0; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1523 | png_write_chunk_data(png_ptr, cbuf, (png_size_t)2); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1524 | |
Glenn Randers-Pehrson | 73d57cb | 2002-03-25 18:49:08 -0600 | [diff] [blame] | 1525 | cbuf[0] = 0; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1526 | png_write_chunk_data(png_ptr, (new_lang ? (png_bytep)new_lang : cbuf), |
| 1527 | (png_size_t)(lang_len + 1)); |
| 1528 | png_write_chunk_data(png_ptr, (lang_key ? (png_bytep)lang_key : cbuf), |
| 1529 | (png_size_t)(lang_key_len + 1)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1530 | png_write_compressed_data_out(png_ptr, &comp); |
| 1531 | |
| 1532 | png_write_chunk_end(png_ptr); |
| 1533 | png_free(png_ptr, new_key); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1534 | png_free(png_ptr, new_lang); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1535 | } |
| 1536 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1537 | |
| 1538 | #if defined(PNG_WRITE_oFFs_SUPPORTED) |
| 1539 | /* write the oFFs chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1540 | void /* PRIVATE */ |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 1541 | png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset, |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1542 | int unit_type) |
| 1543 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1544 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1545 | PNG_oFFs; |
| 1546 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1547 | png_byte buf[9]; |
| 1548 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1549 | png_debug(1, "in png_write_oFFs"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1550 | if (unit_type >= PNG_OFFSET_LAST) |
| 1551 | png_warning(png_ptr, "Unrecognized unit type for oFFs chunk"); |
| 1552 | |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 1553 | png_save_int_32(buf, x_offset); |
| 1554 | png_save_int_32(buf + 4, y_offset); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1555 | buf[8] = (png_byte)unit_type; |
| 1556 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1557 | png_write_chunk(png_ptr, (png_bytep)png_oFFs, buf, (png_size_t)9); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1558 | } |
| 1559 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1560 | #if defined(PNG_WRITE_pCAL_SUPPORTED) |
Glenn Randers-Pehrson | ff9c947 | 2000-07-11 07:12:36 -0500 | [diff] [blame] | 1561 | /* write the pCAL chunk (described in the PNG extensions document) */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1562 | void /* PRIVATE */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1563 | png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0, |
| 1564 | png_int_32 X1, int type, int nparams, png_charp units, png_charpp params) |
| 1565 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1566 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1567 | PNG_pCAL; |
| 1568 | #endif |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1569 | png_size_t purpose_len, units_len, total_len; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1570 | png_uint_32p params_len; |
| 1571 | png_byte buf[10]; |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1572 | png_charp new_purpose; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1573 | int i; |
| 1574 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1575 | png_debug1(1, "in png_write_pCAL (%d parameters)", nparams); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1576 | if (type >= PNG_EQUATION_LAST) |
| 1577 | png_warning(png_ptr, "Unrecognized equation type for pCAL chunk"); |
| 1578 | |
| 1579 | purpose_len = png_check_keyword(png_ptr, purpose, &new_purpose) + 1; |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1580 | png_debug1(3, "pCAL purpose length = %d", (int)purpose_len); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1581 | units_len = png_strlen(units) + (nparams == 0 ? 0 : 1); |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1582 | png_debug1(3, "pCAL units length = %d", (int)units_len); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1583 | total_len = purpose_len + units_len + 10; |
| 1584 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1585 | params_len = (png_uint_32p)png_malloc(png_ptr, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1586 | (png_size_t)(nparams * png_sizeof(png_uint_32))); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1587 | |
| 1588 | /* Find the length of each parameter, making sure we don't count the |
| 1589 | null terminator for the last parameter. */ |
| 1590 | for (i = 0; i < nparams; i++) |
| 1591 | { |
| 1592 | params_len[i] = png_strlen(params[i]) + (i == nparams - 1 ? 0 : 1); |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1593 | png_debug2(3, "pCAL parameter %d length = %lu", i, |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1594 | (unsigned long) params_len[i]); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1595 | total_len += (png_size_t)params_len[i]; |
| 1596 | } |
| 1597 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1598 | png_debug1(3, "pCAL total length = %d", (int)total_len); |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1599 | png_write_chunk_start(png_ptr, (png_bytep)png_pCAL, (png_uint_32)total_len); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1600 | png_write_chunk_data(png_ptr, (png_bytep)new_purpose, |
| 1601 | (png_size_t)purpose_len); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1602 | png_save_int_32(buf, X0); |
| 1603 | png_save_int_32(buf + 4, X1); |
| 1604 | buf[8] = (png_byte)type; |
| 1605 | buf[9] = (png_byte)nparams; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1606 | png_write_chunk_data(png_ptr, buf, (png_size_t)10); |
| 1607 | png_write_chunk_data(png_ptr, (png_bytep)units, (png_size_t)units_len); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1608 | |
| 1609 | png_free(png_ptr, new_purpose); |
| 1610 | |
| 1611 | for (i = 0; i < nparams; i++) |
| 1612 | { |
| 1613 | png_write_chunk_data(png_ptr, (png_bytep)params[i], |
| 1614 | (png_size_t)params_len[i]); |
| 1615 | } |
| 1616 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1617 | png_free(png_ptr, params_len); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1618 | png_write_chunk_end(png_ptr); |
| 1619 | } |
| 1620 | #endif |
| 1621 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1622 | #if defined(PNG_WRITE_sCAL_SUPPORTED) |
| 1623 | /* write the sCAL chunk */ |
Glenn Randers-Pehrson | 68ea243 | 2000-04-01 21:10:05 -0600 | [diff] [blame] | 1624 | #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1625 | void /* PRIVATE */ |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1626 | png_write_sCAL(png_structp png_ptr, int unit, double width, double height) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1627 | { |
| 1628 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1629 | PNG_sCAL; |
| 1630 | #endif |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1631 | char buf[64]; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1632 | png_size_t total_len; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1633 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1634 | png_debug(1, "in png_write_sCAL"); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1635 | |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1636 | buf[0] = (char)unit; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1637 | png_snprintf(buf + 1, 63, "%12.12e", width); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1638 | total_len = 1 + png_strlen(buf + 1) + 1; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1639 | png_snprintf(buf + total_len, 64-total_len, "%12.12e", height); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1640 | total_len += png_strlen(buf + total_len); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1641 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1642 | png_debug1(3, "sCAL total length = %u", (unsigned int)total_len); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1643 | png_write_chunk(png_ptr, (png_bytep)png_sCAL, (png_bytep)buf, total_len); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1644 | } |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1645 | #else |
| 1646 | #ifdef PNG_FIXED_POINT_SUPPORTED |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1647 | void /* PRIVATE */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1648 | png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width, |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1649 | png_charp height) |
| 1650 | { |
| 1651 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1652 | PNG_sCAL; |
| 1653 | #endif |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1654 | png_byte buf[64]; |
| 1655 | png_size_t wlen, hlen, total_len; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1656 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1657 | png_debug(1, "in png_write_sCAL_s"); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1658 | |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1659 | wlen = png_strlen(width); |
| 1660 | hlen = png_strlen(height); |
| 1661 | total_len = wlen + hlen + 2; |
| 1662 | if (total_len > 64) |
| 1663 | { |
| 1664 | png_warning(png_ptr, "Can't write sCAL (buffer too small)"); |
| 1665 | return; |
| 1666 | } |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1667 | |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1668 | buf[0] = (png_byte)unit; |
| 1669 | png_memcpy(buf + 1, width, wlen + 1); /* append the '\0' here */ |
| 1670 | png_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] | 1671 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1672 | png_debug1(3, "sCAL total length = %u", (unsigned int)total_len); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1673 | png_write_chunk(png_ptr, (png_bytep)png_sCAL, buf, total_len); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1674 | } |
| 1675 | #endif |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1676 | #endif |
| 1677 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1678 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1679 | #if defined(PNG_WRITE_pHYs_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1680 | /* write the pHYs chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1681 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1682 | png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit, |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1683 | png_uint_32 y_pixels_per_unit, |
| 1684 | int unit_type) |
| 1685 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1686 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1687 | PNG_pHYs; |
| 1688 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1689 | png_byte buf[9]; |
| 1690 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1691 | png_debug(1, "in png_write_pHYs"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1692 | if (unit_type >= PNG_RESOLUTION_LAST) |
| 1693 | png_warning(png_ptr, "Unrecognized unit type for pHYs chunk"); |
| 1694 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1695 | png_save_uint_32(buf, x_pixels_per_unit); |
| 1696 | png_save_uint_32(buf + 4, y_pixels_per_unit); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1697 | buf[8] = (png_byte)unit_type; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1698 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1699 | png_write_chunk(png_ptr, (png_bytep)png_pHYs, buf, (png_size_t)9); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1700 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1701 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1702 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1703 | #if defined(PNG_WRITE_tIME_SUPPORTED) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1704 | /* Write the tIME chunk. Use either png_convert_from_struct_tm() |
| 1705 | * or png_convert_from_time_t(), or fill in the structure yourself. |
| 1706 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1707 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1708 | png_write_tIME(png_structp png_ptr, png_timep mod_time) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1709 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1710 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1711 | PNG_tIME; |
| 1712 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1713 | png_byte buf[7]; |
| 1714 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1715 | png_debug(1, "in png_write_tIME"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1716 | if (mod_time->month > 12 || mod_time->month < 1 || |
| 1717 | mod_time->day > 31 || mod_time->day < 1 || |
| 1718 | mod_time->hour > 23 || mod_time->second > 60) |
| 1719 | { |
| 1720 | png_warning(png_ptr, "Invalid time specified for tIME chunk"); |
| 1721 | return; |
| 1722 | } |
| 1723 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1724 | png_save_uint_16(buf, mod_time->year); |
| 1725 | buf[2] = mod_time->month; |
| 1726 | buf[3] = mod_time->day; |
| 1727 | buf[4] = mod_time->hour; |
| 1728 | buf[5] = mod_time->minute; |
| 1729 | buf[6] = mod_time->second; |
| 1730 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1731 | png_write_chunk(png_ptr, (png_bytep)png_tIME, buf, (png_size_t)7); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1732 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1733 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1734 | |
| 1735 | /* initializes the row writing capability of libpng */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1736 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1737 | png_write_start_row(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1738 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1739 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1740 | #ifdef PNG_USE_LOCAL_ARRAYS |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1741 | /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1742 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1743 | /* start of interlace block */ |
| 1744 | int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1745 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1746 | /* offset to next interlace block */ |
| 1747 | int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1748 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1749 | /* start of interlace block in the y direction */ |
| 1750 | int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1751 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1752 | /* offset to next interlace block in the y direction */ |
| 1753 | int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1754 | #endif |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1755 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1756 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1757 | png_size_t buf_size; |
| 1758 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1759 | png_debug(1, "in png_write_start_row"); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1760 | buf_size = (png_size_t)(PNG_ROWBYTES( |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1761 | png_ptr->usr_channels*png_ptr->usr_bit_depth, png_ptr->width) + 1); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1762 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1763 | /* set up row buffer */ |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1764 | png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, |
| 1765 | (png_size_t)buf_size); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1766 | png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1767 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1768 | #ifndef PNG_NO_WRITE_FILTER |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1769 | /* set up filtering buffer, if using this filter */ |
| 1770 | if (png_ptr->do_filter & PNG_FILTER_SUB) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1771 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1772 | png_ptr->sub_row = (png_bytep)png_malloc(png_ptr, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1773 | (png_size_t)(png_ptr->rowbytes + 1)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1774 | png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1775 | } |
| 1776 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1777 | /* 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] | 1778 | if (png_ptr->do_filter & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH)) |
| 1779 | { |
| 1780 | /* set up previous row buffer */ |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1781 | png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, |
| 1782 | (png_size_t)buf_size); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1783 | png_memset(png_ptr->prev_row, 0, buf_size); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1784 | |
| 1785 | if (png_ptr->do_filter & PNG_FILTER_UP) |
| 1786 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1787 | png_ptr->up_row = (png_bytep)png_malloc(png_ptr, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1788 | (png_size_t)(png_ptr->rowbytes + 1)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1789 | png_ptr->up_row[0] = PNG_FILTER_VALUE_UP; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1790 | } |
| 1791 | |
| 1792 | if (png_ptr->do_filter & PNG_FILTER_AVG) |
| 1793 | { |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1794 | png_ptr->avg_row = (png_bytep)png_malloc(png_ptr, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1795 | (png_size_t)(png_ptr->rowbytes + 1)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1796 | png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1797 | } |
| 1798 | |
| 1799 | if (png_ptr->do_filter & PNG_FILTER_PAETH) |
| 1800 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1801 | png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1802 | (png_size_t)(png_ptr->rowbytes + 1)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1803 | png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1804 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1805 | } |
Glenn Randers-Pehrson | eb58091 | 2008-07-30 14:47:09 -0500 | [diff] [blame] | 1806 | #endif /* PNG_NO_WRITE_FILTER */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1807 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1808 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1809 | /* if interlaced, we need to set up width and height of pass */ |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1810 | if (png_ptr->interlaced) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1811 | { |
| 1812 | if (!(png_ptr->transformations & PNG_INTERLACE)) |
| 1813 | { |
| 1814 | png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 - |
| 1815 | png_pass_ystart[0]) / png_pass_yinc[0]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1816 | png_ptr->usr_width = (png_ptr->width + png_pass_inc[0] - 1 - |
| 1817 | png_pass_start[0]) / png_pass_inc[0]; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1818 | } |
| 1819 | else |
| 1820 | { |
| 1821 | png_ptr->num_rows = png_ptr->height; |
| 1822 | png_ptr->usr_width = png_ptr->width; |
| 1823 | } |
| 1824 | } |
| 1825 | else |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1826 | #endif |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1827 | { |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1828 | png_ptr->num_rows = png_ptr->height; |
| 1829 | png_ptr->usr_width = png_ptr->width; |
| 1830 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1831 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 1832 | png_ptr->zstream.next_out = png_ptr->zbuf; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1833 | } |
| 1834 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1835 | /* Internal use only. Called when finished processing a row of data. */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1836 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1837 | png_write_finish_row(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1838 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1839 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1840 | #ifdef PNG_USE_LOCAL_ARRAYS |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1841 | /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1842 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1843 | /* start of interlace block */ |
| 1844 | int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1845 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1846 | /* offset to next interlace block */ |
| 1847 | int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1848 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1849 | /* start of interlace block in the y direction */ |
| 1850 | int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1851 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1852 | /* offset to next interlace block in the y direction */ |
| 1853 | int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1854 | #endif |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1855 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1856 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1857 | int ret; |
| 1858 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1859 | png_debug(1, "in png_write_finish_row"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1860 | /* next row */ |
| 1861 | png_ptr->row_number++; |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 1862 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1863 | /* see if we are done */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1864 | if (png_ptr->row_number < png_ptr->num_rows) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1865 | return; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1866 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1867 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1868 | /* if interlaced, go to next pass */ |
| 1869 | if (png_ptr->interlaced) |
| 1870 | { |
| 1871 | png_ptr->row_number = 0; |
| 1872 | if (png_ptr->transformations & PNG_INTERLACE) |
| 1873 | { |
| 1874 | png_ptr->pass++; |
| 1875 | } |
| 1876 | else |
| 1877 | { |
| 1878 | /* loop until we find a non-zero width or height pass */ |
| 1879 | do |
| 1880 | { |
| 1881 | png_ptr->pass++; |
| 1882 | if (png_ptr->pass >= 7) |
| 1883 | break; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1884 | png_ptr->usr_width = (png_ptr->width + |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1885 | png_pass_inc[png_ptr->pass] - 1 - |
| 1886 | png_pass_start[png_ptr->pass]) / |
| 1887 | png_pass_inc[png_ptr->pass]; |
| 1888 | png_ptr->num_rows = (png_ptr->height + |
| 1889 | png_pass_yinc[png_ptr->pass] - 1 - |
| 1890 | png_pass_ystart[png_ptr->pass]) / |
| 1891 | png_pass_yinc[png_ptr->pass]; |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1892 | if (png_ptr->transformations & PNG_INTERLACE) |
| 1893 | break; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1894 | } while (png_ptr->usr_width == 0 || png_ptr->num_rows == 0); |
| 1895 | |
| 1896 | } |
| 1897 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1898 | /* reset the row above the image for the next pass */ |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1899 | if (png_ptr->pass < 7) |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 1900 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1901 | if (png_ptr->prev_row != NULL) |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1902 | png_memset(png_ptr->prev_row, 0, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1903 | (png_size_t)(PNG_ROWBYTES(png_ptr->usr_channels* |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1904 | png_ptr->usr_bit_depth, png_ptr->width)) + 1); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1905 | return; |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 1906 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1907 | } |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1908 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1909 | |
| 1910 | /* if we get here, we've just written the last row, so we need |
| 1911 | to flush the compressor */ |
| 1912 | do |
| 1913 | { |
| 1914 | /* tell the compressor we are done */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1915 | ret = deflate(&png_ptr->zstream, Z_FINISH); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1916 | /* check for an error */ |
Glenn Randers-Pehrson | 104622b | 2000-05-29 08:58:03 -0500 | [diff] [blame] | 1917 | if (ret == Z_OK) |
| 1918 | { |
| 1919 | /* check to see if we need more room */ |
| 1920 | if (!(png_ptr->zstream.avail_out)) |
| 1921 | { |
| 1922 | png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); |
| 1923 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 1924 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 1925 | } |
| 1926 | } |
| 1927 | else if (ret != Z_STREAM_END) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1928 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1929 | if (png_ptr->zstream.msg != NULL) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1930 | png_error(png_ptr, png_ptr->zstream.msg); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1931 | else |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1932 | png_error(png_ptr, "zlib error"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1933 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1934 | } while (ret != Z_STREAM_END); |
| 1935 | |
| 1936 | /* write any extra space */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1937 | if (png_ptr->zstream.avail_out < png_ptr->zbuf_size) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1938 | { |
| 1939 | png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size - |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1940 | png_ptr->zstream.avail_out); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1941 | } |
| 1942 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1943 | deflateReset(&png_ptr->zstream); |
Glenn Randers-Pehrson | 878b31e | 2004-11-12 22:04:56 -0600 | [diff] [blame] | 1944 | png_ptr->zstream.data_type = Z_BINARY; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1945 | } |
| 1946 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1947 | #if defined(PNG_WRITE_INTERLACING_SUPPORTED) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1948 | /* Pick out the correct pixels for the interlace pass. |
| 1949 | * The basic idea here is to go through the row with a source |
| 1950 | * pointer and a destination pointer (sp and dp), and copy the |
| 1951 | * correct pixels for the pass. As the row gets compacted, |
| 1952 | * sp will always be >= dp, so we should never overwrite anything. |
| 1953 | * See the default: case for the easiest code to understand. |
| 1954 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1955 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1956 | 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] | 1957 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1958 | #ifdef PNG_USE_LOCAL_ARRAYS |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1959 | /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1960 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1961 | /* start of interlace block */ |
| 1962 | int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1963 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1964 | /* offset to next interlace block */ |
| 1965 | int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1966 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1967 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1968 | png_debug(1, "in png_do_write_interlace"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1969 | /* we don't have to do anything on the last pass (6) */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1970 | if (pass < 6) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1971 | { |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 1972 | /* each pixel depth is handled separately */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1973 | switch (row_info->pixel_depth) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1974 | { |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1975 | case 1: |
| 1976 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1977 | png_bytep sp; |
| 1978 | png_bytep dp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1979 | int shift; |
| 1980 | int d; |
| 1981 | int value; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1982 | png_uint_32 i; |
| 1983 | png_uint_32 row_width = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1984 | |
| 1985 | dp = row; |
| 1986 | d = 0; |
| 1987 | shift = 7; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1988 | for (i = png_pass_start[pass]; i < row_width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1989 | i += png_pass_inc[pass]) |
| 1990 | { |
| 1991 | sp = row + (png_size_t)(i >> 3); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1992 | value = (int)(*sp >> (7 - (int)(i & 0x07))) & 0x01; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1993 | d |= (value << shift); |
| 1994 | |
| 1995 | if (shift == 0) |
| 1996 | { |
| 1997 | shift = 7; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1998 | *dp++ = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1999 | d = 0; |
| 2000 | } |
| 2001 | else |
| 2002 | shift--; |
| 2003 | |
| 2004 | } |
| 2005 | if (shift != 7) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2006 | *dp = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2007 | break; |
| 2008 | } |
| 2009 | case 2: |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2010 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2011 | png_bytep sp; |
| 2012 | png_bytep dp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2013 | int shift; |
| 2014 | int d; |
| 2015 | int value; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2016 | png_uint_32 i; |
| 2017 | png_uint_32 row_width = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2018 | |
| 2019 | dp = row; |
| 2020 | shift = 6; |
| 2021 | d = 0; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2022 | for (i = png_pass_start[pass]; i < row_width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2023 | i += png_pass_inc[pass]) |
| 2024 | { |
| 2025 | sp = row + (png_size_t)(i >> 2); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2026 | value = (*sp >> ((3 - (int)(i & 0x03)) << 1)) & 0x03; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2027 | d |= (value << shift); |
| 2028 | |
| 2029 | if (shift == 0) |
| 2030 | { |
| 2031 | shift = 6; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2032 | *dp++ = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2033 | d = 0; |
| 2034 | } |
| 2035 | else |
| 2036 | shift -= 2; |
| 2037 | } |
| 2038 | if (shift != 6) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2039 | *dp = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2040 | break; |
| 2041 | } |
| 2042 | case 4: |
| 2043 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2044 | png_bytep sp; |
| 2045 | png_bytep dp; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2046 | int shift; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2047 | int d; |
| 2048 | int value; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2049 | png_uint_32 i; |
| 2050 | png_uint_32 row_width = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2051 | |
| 2052 | dp = row; |
| 2053 | shift = 4; |
| 2054 | d = 0; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2055 | for (i = png_pass_start[pass]; i < row_width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2056 | i += png_pass_inc[pass]) |
| 2057 | { |
| 2058 | sp = row + (png_size_t)(i >> 1); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2059 | value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2060 | d |= (value << shift); |
| 2061 | |
| 2062 | if (shift == 0) |
| 2063 | { |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2064 | shift = 4; |
| 2065 | *dp++ = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2066 | d = 0; |
| 2067 | } |
| 2068 | else |
| 2069 | shift -= 4; |
| 2070 | } |
| 2071 | if (shift != 4) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2072 | *dp = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2073 | break; |
| 2074 | } |
| 2075 | default: |
| 2076 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2077 | png_bytep sp; |
| 2078 | png_bytep dp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2079 | png_uint_32 i; |
| 2080 | png_uint_32 row_width = row_info->width; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2081 | png_size_t pixel_bytes; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2082 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2083 | /* start at the beginning */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2084 | dp = row; |
| 2085 | /* find out how many bytes each pixel takes up */ |
| 2086 | pixel_bytes = (row_info->pixel_depth >> 3); |
| 2087 | /* loop through the row, only looking at the pixels that |
| 2088 | matter */ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2089 | for (i = png_pass_start[pass]; i < row_width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2090 | i += png_pass_inc[pass]) |
| 2091 | { |
| 2092 | /* find out where the original pixel is */ |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 2093 | sp = row + (png_size_t)i * pixel_bytes; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2094 | /* move the pixel */ |
| 2095 | if (dp != sp) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2096 | png_memcpy(dp, sp, pixel_bytes); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2097 | /* next pixel */ |
| 2098 | dp += pixel_bytes; |
| 2099 | } |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2100 | break; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2101 | } |
| 2102 | } |
| 2103 | /* set new row width */ |
| 2104 | row_info->width = (row_info->width + |
| 2105 | png_pass_inc[pass] - 1 - |
| 2106 | png_pass_start[pass]) / |
| 2107 | png_pass_inc[pass]; |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 2108 | row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, |
| 2109 | row_info->width); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2110 | } |
| 2111 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2112 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2113 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2114 | /* This filters the row, chooses which filter to use, if it has not already |
| 2115 | * 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] | 2116 | * chosen filter. |
| 2117 | */ |
Glenn Randers-Pehrson | 7806777 | 2004-11-02 21:49:39 -0600 | [diff] [blame] | 2118 | #define PNG_MAXSUM (((png_uint_32)(-1)) >> 1) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2119 | #define PNG_HISHIFT 10 |
Glenn Randers-Pehrson | ea3bcd7 | 1998-03-07 14:33:00 -0600 | [diff] [blame] | 2120 | #define PNG_LOMASK ((png_uint_32)0xffffL) |
| 2121 | #define PNG_HIMASK ((png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT)) |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 2122 | void /* PRIVATE */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2123 | png_write_find_filter(png_structp png_ptr, png_row_infop row_info) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2124 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 2125 | png_bytep best_row; |
| 2126 | #ifndef PNG_NO_WRITE_FILTER |
| 2127 | png_bytep prev_row, row_buf; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2128 | png_uint_32 mins, bpp; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2129 | png_byte filter_to_do = png_ptr->do_filter; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2130 | png_uint_32 row_bytes = row_info->rowbytes; |
| 2131 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2132 | int num_p_filters = (int)png_ptr->num_prev_filters; |
| 2133 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2134 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 2135 | png_debug(1, "in png_write_find_filter"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2136 | /* find out how many bytes offset each pixel is */ |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 2137 | bpp = (row_info->pixel_depth + 7) >> 3; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2138 | |
| 2139 | prev_row = png_ptr->prev_row; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 2140 | #endif |
| 2141 | best_row = png_ptr->row_buf; |
| 2142 | #ifndef PNG_NO_WRITE_FILTER |
| 2143 | row_buf = best_row; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2144 | mins = PNG_MAXSUM; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2145 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2146 | /* The prediction method we use is to find which method provides the |
| 2147 | * smallest value when summing the absolute values of the distances |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 2148 | * from zero, using anything >= 128 as negative numbers. This is known |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2149 | * as the "minimum sum of absolute differences" heuristic. Other |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2150 | * heuristics are the "weighted minimum sum of absolute differences" |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2151 | * (experimental and can in theory improve compression), and the "zlib |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 2152 | * predictive" method (not implemented yet), which does test compressions |
| 2153 | * of lines using different filter methods, and then chooses the |
| 2154 | * (series of) filter(s) that give minimum compressed data size (VERY |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2155 | * computationally expensive). |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 2156 | * |
| 2157 | * GRR 980525: consider also |
| 2158 | * (1) minimum sum of absolute differences from running average (i.e., |
| 2159 | * keep running sum of non-absolute differences & count of bytes) |
| 2160 | * [track dispersion, too? restart average if dispersion too large?] |
| 2161 | * (1b) minimum sum of absolute differences from sliding average, probably |
| 2162 | * with window size <= deflate window (usually 32K) |
| 2163 | * (2) minimum sum of squared differences from zero or running average |
| 2164 | * (i.e., ~ root-mean-square approach) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2165 | */ |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2166 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2167 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2168 | /* 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] | 2169 | * that has been chosen, as it doesn't actually do anything to the data. |
| 2170 | */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2171 | if ((filter_to_do & PNG_FILTER_NONE) && |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2172 | filter_to_do != PNG_FILTER_NONE) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2173 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2174 | png_bytep rp; |
| 2175 | png_uint_32 sum = 0; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2176 | png_uint_32 i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2177 | int v; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2178 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2179 | for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2180 | { |
| 2181 | v = *rp; |
| 2182 | sum += (v < 128) ? v : 256 - v; |
| 2183 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2184 | |
| 2185 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2186 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2187 | { |
| 2188 | png_uint_32 sumhi, sumlo; |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2189 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2190 | sumlo = sum & PNG_LOMASK; |
| 2191 | sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; /* Gives us some footroom */ |
| 2192 | |
| 2193 | /* Reduce the sum if we match any of the previous rows */ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2194 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2195 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2196 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2197 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2198 | sumlo = (sumlo * png_ptr->filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2199 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2200 | sumhi = (sumhi * png_ptr->filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2201 | PNG_WEIGHT_SHIFT; |
| 2202 | } |
| 2203 | } |
| 2204 | |
| 2205 | /* Factor in the cost of this filter (this is here for completeness, |
| 2206 | * but it makes no sense to have a "cost" for the NONE filter, as |
| 2207 | * it has the minimum possible computational cost - none). |
| 2208 | */ |
| 2209 | sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >> |
| 2210 | PNG_COST_SHIFT; |
| 2211 | sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >> |
| 2212 | PNG_COST_SHIFT; |
| 2213 | |
| 2214 | if (sumhi > PNG_HIMASK) |
| 2215 | sum = PNG_MAXSUM; |
| 2216 | else |
| 2217 | sum = (sumhi << PNG_HISHIFT) + sumlo; |
| 2218 | } |
| 2219 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2220 | mins = sum; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2221 | } |
| 2222 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2223 | /* sub filter */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2224 | if (filter_to_do == PNG_FILTER_SUB) |
| 2225 | /* it's the only filter so no testing is needed */ |
| 2226 | { |
| 2227 | png_bytep rp, lp, dp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2228 | png_uint_32 i; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2229 | for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp; |
| 2230 | i++, rp++, dp++) |
| 2231 | { |
| 2232 | *dp = *rp; |
| 2233 | } |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2234 | for (lp = row_buf + 1; i < row_bytes; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2235 | i++, rp++, lp++, dp++) |
| 2236 | { |
| 2237 | *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff); |
| 2238 | } |
| 2239 | best_row = png_ptr->sub_row; |
| 2240 | } |
| 2241 | |
| 2242 | else if (filter_to_do & PNG_FILTER_SUB) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2243 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2244 | png_bytep rp, dp, lp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2245 | png_uint_32 sum = 0, lmins = mins; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2246 | png_uint_32 i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2247 | int v; |
| 2248 | |
| 2249 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2250 | /* We temporarily increase the "minimum sum" by the factor we |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2251 | * would reduce the sum of this filter, so that we can do the |
| 2252 | * early exit comparison without scaling the sum each time. |
| 2253 | */ |
| 2254 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2255 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2256 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2257 | png_uint_32 lmhi, lmlo; |
| 2258 | lmlo = lmins & PNG_LOMASK; |
| 2259 | lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; |
| 2260 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2261 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2262 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2263 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2264 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2265 | lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2266 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2267 | lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2268 | PNG_WEIGHT_SHIFT; |
| 2269 | } |
| 2270 | } |
| 2271 | |
| 2272 | lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> |
| 2273 | PNG_COST_SHIFT; |
| 2274 | lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> |
| 2275 | PNG_COST_SHIFT; |
| 2276 | |
| 2277 | if (lmhi > PNG_HIMASK) |
| 2278 | lmins = PNG_MAXSUM; |
| 2279 | else |
| 2280 | lmins = (lmhi << PNG_HISHIFT) + lmlo; |
| 2281 | } |
| 2282 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2283 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2284 | for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp; |
| 2285 | i++, rp++, dp++) |
| 2286 | { |
| 2287 | v = *dp = *rp; |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2288 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2289 | sum += (v < 128) ? v : 256 - v; |
| 2290 | } |
Glenn Randers-Pehrson | 5b5dcf8 | 2004-07-17 22:45:44 -0500 | [diff] [blame] | 2291 | for (lp = row_buf + 1; i < row_bytes; |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 2292 | i++, rp++, lp++, dp++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2293 | { |
| 2294 | v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2295 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2296 | sum += (v < 128) ? v : 256 - v; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2297 | |
| 2298 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2299 | break; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2300 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2301 | |
| 2302 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2303 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2304 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2305 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2306 | png_uint_32 sumhi, sumlo; |
| 2307 | sumlo = sum & PNG_LOMASK; |
| 2308 | sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; |
| 2309 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2310 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2311 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2312 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2313 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2314 | sumlo = (sumlo * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2315 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2316 | sumhi = (sumhi * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2317 | PNG_WEIGHT_SHIFT; |
| 2318 | } |
| 2319 | } |
| 2320 | |
| 2321 | sumlo = (sumlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> |
| 2322 | PNG_COST_SHIFT; |
| 2323 | sumhi = (sumhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> |
| 2324 | PNG_COST_SHIFT; |
| 2325 | |
| 2326 | if (sumhi > PNG_HIMASK) |
| 2327 | sum = PNG_MAXSUM; |
| 2328 | else |
| 2329 | sum = (sumhi << PNG_HISHIFT) + sumlo; |
| 2330 | } |
| 2331 | #endif |
| 2332 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2333 | if (sum < mins) |
| 2334 | { |
| 2335 | mins = sum; |
| 2336 | best_row = png_ptr->sub_row; |
| 2337 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2338 | } |
| 2339 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2340 | /* up filter */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2341 | if (filter_to_do == PNG_FILTER_UP) |
| 2342 | { |
| 2343 | png_bytep rp, dp, pp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2344 | png_uint_32 i; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2345 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2346 | for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1, |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2347 | pp = prev_row + 1; i < row_bytes; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2348 | i++, rp++, pp++, dp++) |
| 2349 | { |
| 2350 | *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff); |
| 2351 | } |
| 2352 | best_row = png_ptr->up_row; |
| 2353 | } |
| 2354 | |
| 2355 | else if (filter_to_do & PNG_FILTER_UP) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2356 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2357 | png_bytep rp, dp, pp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2358 | png_uint_32 sum = 0, lmins = mins; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2359 | png_uint_32 i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2360 | int v; |
| 2361 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2362 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2363 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2364 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2365 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2366 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2367 | png_uint_32 lmhi, lmlo; |
| 2368 | lmlo = lmins & PNG_LOMASK; |
| 2369 | lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; |
| 2370 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2371 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2372 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2373 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2374 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2375 | lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2376 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2377 | lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2378 | PNG_WEIGHT_SHIFT; |
| 2379 | } |
| 2380 | } |
| 2381 | |
| 2382 | lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >> |
| 2383 | PNG_COST_SHIFT; |
| 2384 | lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >> |
| 2385 | PNG_COST_SHIFT; |
| 2386 | |
| 2387 | if (lmhi > PNG_HIMASK) |
| 2388 | lmins = PNG_MAXSUM; |
| 2389 | else |
| 2390 | lmins = (lmhi << PNG_HISHIFT) + lmlo; |
| 2391 | } |
| 2392 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2393 | |
| 2394 | for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1, |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2395 | pp = prev_row + 1; i < row_bytes; i++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2396 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2397 | v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2398 | |
| 2399 | sum += (v < 128) ? v : 256 - v; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2400 | |
| 2401 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2402 | break; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2403 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2404 | |
| 2405 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2406 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2407 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2408 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2409 | png_uint_32 sumhi, sumlo; |
| 2410 | sumlo = sum & PNG_LOMASK; |
| 2411 | sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; |
| 2412 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2413 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2414 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2415 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2416 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2417 | sumlo = (sumlo * png_ptr->filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2418 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2419 | sumhi = (sumhi * png_ptr->filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2420 | PNG_WEIGHT_SHIFT; |
| 2421 | } |
| 2422 | } |
| 2423 | |
| 2424 | sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >> |
| 2425 | PNG_COST_SHIFT; |
| 2426 | sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >> |
| 2427 | PNG_COST_SHIFT; |
| 2428 | |
| 2429 | if (sumhi > PNG_HIMASK) |
| 2430 | sum = PNG_MAXSUM; |
| 2431 | else |
| 2432 | sum = (sumhi << PNG_HISHIFT) + sumlo; |
| 2433 | } |
| 2434 | #endif |
| 2435 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2436 | if (sum < mins) |
| 2437 | { |
| 2438 | mins = sum; |
| 2439 | best_row = png_ptr->up_row; |
| 2440 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2441 | } |
| 2442 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2443 | /* avg filter */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2444 | if (filter_to_do == PNG_FILTER_AVG) |
| 2445 | { |
| 2446 | png_bytep rp, dp, pp, lp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2447 | png_uint_32 i; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2448 | 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] | 2449 | pp = prev_row + 1; i < bpp; i++) |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2450 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2451 | *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2452 | } |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2453 | for (lp = row_buf + 1; i < row_bytes; i++) |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2454 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2455 | *dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) |
| 2456 | & 0xff); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2457 | } |
| 2458 | best_row = png_ptr->avg_row; |
| 2459 | } |
| 2460 | |
| 2461 | else if (filter_to_do & PNG_FILTER_AVG) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2462 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2463 | png_bytep rp, dp, pp, lp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2464 | png_uint_32 sum = 0, lmins = mins; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2465 | png_uint_32 i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2466 | int v; |
| 2467 | |
| 2468 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2469 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2470 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2471 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2472 | png_uint_32 lmhi, lmlo; |
| 2473 | lmlo = lmins & PNG_LOMASK; |
| 2474 | lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; |
| 2475 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2476 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2477 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2478 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_AVG) |
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 | lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2481 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2482 | lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2483 | PNG_WEIGHT_SHIFT; |
| 2484 | } |
| 2485 | } |
| 2486 | |
| 2487 | lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >> |
| 2488 | PNG_COST_SHIFT; |
| 2489 | lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >> |
| 2490 | PNG_COST_SHIFT; |
| 2491 | |
| 2492 | if (lmhi > PNG_HIMASK) |
| 2493 | lmins = PNG_MAXSUM; |
| 2494 | else |
| 2495 | lmins = (lmhi << PNG_HISHIFT) + lmlo; |
| 2496 | } |
| 2497 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2498 | |
| 2499 | 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] | 2500 | pp = prev_row + 1; i < bpp; i++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2501 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2502 | v = *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2503 | |
| 2504 | sum += (v < 128) ? v : 256 - v; |
| 2505 | } |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2506 | for (lp = row_buf + 1; i < row_bytes; i++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2507 | { |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2508 | v = *dp++ = |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2509 | (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) & 0xff); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2510 | |
| 2511 | sum += (v < 128) ? v : 256 - v; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2512 | |
| 2513 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2514 | break; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2515 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2516 | |
| 2517 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2518 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2519 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2520 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2521 | png_uint_32 sumhi, sumlo; |
| 2522 | sumlo = sum & PNG_LOMASK; |
| 2523 | sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; |
| 2524 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2525 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2526 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2527 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2528 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2529 | sumlo = (sumlo * png_ptr->filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2530 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2531 | sumhi = (sumhi * png_ptr->filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2532 | PNG_WEIGHT_SHIFT; |
| 2533 | } |
| 2534 | } |
| 2535 | |
| 2536 | sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >> |
| 2537 | PNG_COST_SHIFT; |
| 2538 | sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >> |
| 2539 | PNG_COST_SHIFT; |
| 2540 | |
| 2541 | if (sumhi > PNG_HIMASK) |
| 2542 | sum = PNG_MAXSUM; |
| 2543 | else |
| 2544 | sum = (sumhi << PNG_HISHIFT) + sumlo; |
| 2545 | } |
| 2546 | #endif |
| 2547 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2548 | if (sum < mins) |
| 2549 | { |
| 2550 | mins = sum; |
| 2551 | best_row = png_ptr->avg_row; |
| 2552 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2553 | } |
| 2554 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2555 | /* Paeth filter */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2556 | if (filter_to_do == PNG_FILTER_PAETH) |
| 2557 | { |
| 2558 | png_bytep rp, dp, pp, cp, lp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2559 | png_uint_32 i; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2560 | for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1, |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2561 | pp = prev_row + 1; i < bpp; i++) |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2562 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2563 | *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2564 | } |
| 2565 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2566 | 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] | 2567 | { |
| 2568 | int a, b, c, pa, pb, pc, p; |
| 2569 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2570 | b = *pp++; |
| 2571 | c = *cp++; |
| 2572 | a = *lp++; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2573 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2574 | p = b - c; |
| 2575 | pc = a - c; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2576 | |
| 2577 | #ifdef PNG_USE_ABS |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2578 | pa = abs(p); |
| 2579 | pb = abs(pc); |
| 2580 | pc = abs(p + pc); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2581 | #else |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2582 | pa = p < 0 ? -p : p; |
| 2583 | pb = pc < 0 ? -pc : pc; |
| 2584 | pc = (p + pc) < 0 ? -(p + pc) : p + pc; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2585 | #endif |
| 2586 | |
| 2587 | p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c; |
| 2588 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2589 | *dp++ = (png_byte)(((int)*rp++ - p) & 0xff); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2590 | } |
| 2591 | best_row = png_ptr->paeth_row; |
| 2592 | } |
| 2593 | |
| 2594 | else if (filter_to_do & PNG_FILTER_PAETH) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2595 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2596 | png_bytep rp, dp, pp, cp, lp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2597 | png_uint_32 sum = 0, lmins = mins; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2598 | png_uint_32 i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2599 | int v; |
| 2600 | |
| 2601 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2602 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2603 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2604 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2605 | png_uint_32 lmhi, lmlo; |
| 2606 | lmlo = lmins & PNG_LOMASK; |
| 2607 | lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; |
| 2608 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2609 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2610 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2611 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2612 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2613 | lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2614 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2615 | lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2616 | PNG_WEIGHT_SHIFT; |
| 2617 | } |
| 2618 | } |
| 2619 | |
| 2620 | lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >> |
| 2621 | PNG_COST_SHIFT; |
| 2622 | lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >> |
| 2623 | PNG_COST_SHIFT; |
| 2624 | |
| 2625 | if (lmhi > PNG_HIMASK) |
| 2626 | lmins = PNG_MAXSUM; |
| 2627 | else |
| 2628 | lmins = (lmhi << PNG_HISHIFT) + lmlo; |
| 2629 | } |
| 2630 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2631 | |
| 2632 | for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1, |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2633 | pp = prev_row + 1; i < bpp; i++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2634 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2635 | v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2636 | |
| 2637 | sum += (v < 128) ? v : 256 - v; |
| 2638 | } |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2639 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2640 | 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] | 2641 | { |
| 2642 | int a, b, c, pa, pb, pc, p; |
| 2643 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2644 | b = *pp++; |
| 2645 | c = *cp++; |
| 2646 | a = *lp++; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2647 | |
| 2648 | #ifndef PNG_SLOW_PAETH |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2649 | p = b - c; |
| 2650 | pc = a - c; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2651 | #ifdef PNG_USE_ABS |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2652 | pa = abs(p); |
| 2653 | pb = abs(pc); |
| 2654 | pc = abs(p + pc); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2655 | #else |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2656 | pa = p < 0 ? -p : p; |
| 2657 | pb = pc < 0 ? -pc : pc; |
| 2658 | pc = (p + pc) < 0 ? -(p + pc) : p + pc; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2659 | #endif |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2660 | p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c; |
| 2661 | #else /* PNG_SLOW_PAETH */ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2662 | p = a + b - c; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2663 | pa = abs(p - a); |
| 2664 | pb = abs(p - b); |
| 2665 | pc = abs(p - c); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2666 | if (pa <= pb && pa <= pc) |
| 2667 | p = a; |
| 2668 | else if (pb <= pc) |
| 2669 | p = b; |
| 2670 | else |
| 2671 | p = c; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2672 | #endif /* PNG_SLOW_PAETH */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2673 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2674 | v = *dp++ = (png_byte)(((int)*rp++ - p) & 0xff); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2675 | |
| 2676 | sum += (v < 128) ? v : 256 - v; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2677 | |
| 2678 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2679 | break; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2680 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2681 | |
| 2682 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2683 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2684 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2685 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2686 | png_uint_32 sumhi, sumlo; |
| 2687 | sumlo = sum & PNG_LOMASK; |
| 2688 | sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; |
| 2689 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2690 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2691 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2692 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2693 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2694 | sumlo = (sumlo * png_ptr->filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2695 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2696 | sumhi = (sumhi * png_ptr->filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2697 | PNG_WEIGHT_SHIFT; |
| 2698 | } |
| 2699 | } |
| 2700 | |
| 2701 | sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >> |
| 2702 | PNG_COST_SHIFT; |
| 2703 | sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >> |
| 2704 | PNG_COST_SHIFT; |
| 2705 | |
| 2706 | if (sumhi > PNG_HIMASK) |
| 2707 | sum = PNG_MAXSUM; |
| 2708 | else |
| 2709 | sum = (sumhi << PNG_HISHIFT) + sumlo; |
| 2710 | } |
| 2711 | #endif |
| 2712 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2713 | if (sum < mins) |
| 2714 | { |
| 2715 | best_row = png_ptr->paeth_row; |
| 2716 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2717 | } |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 2718 | #endif /* PNG_NO_WRITE_FILTER */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2719 | /* Do the actual writing of the filtered row data from the chosen filter. */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2720 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2721 | png_write_filtered_row(png_ptr, best_row); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2722 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 2723 | #ifndef PNG_NO_WRITE_FILTER |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2724 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2725 | /* Save the type of filter we picked this time for future calculations */ |
| 2726 | if (png_ptr->num_prev_filters > 0) |
| 2727 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2728 | int j; |
| 2729 | for (j = 1; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2730 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2731 | png_ptr->prev_filters[j] = png_ptr->prev_filters[j - 1]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2732 | } |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2733 | png_ptr->prev_filters[j] = best_row[0]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2734 | } |
| 2735 | #endif |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 2736 | #endif /* PNG_NO_WRITE_FILTER */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2737 | } |
| 2738 | |
| 2739 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2740 | /* Do the actual writing of a previously filtered row. */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 2741 | void /* PRIVATE */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2742 | png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row) |
| 2743 | { |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 2744 | png_debug(1, "in png_write_filtered_row"); |
| 2745 | png_debug1(2, "filter = %d", filtered_row[0]); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2746 | /* set up the zlib input buffer */ |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 2747 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2748 | png_ptr->zstream.next_in = filtered_row; |
| 2749 | png_ptr->zstream.avail_in = (uInt)png_ptr->row_info.rowbytes + 1; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2750 | /* repeat until we have compressed all the data */ |
| 2751 | do |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2752 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2753 | int ret; /* return of zlib */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2754 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2755 | /* compress the data */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2756 | ret = deflate(&png_ptr->zstream, Z_NO_FLUSH); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2757 | /* check for compression errors */ |
| 2758 | if (ret != Z_OK) |
| 2759 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2760 | if (png_ptr->zstream.msg != NULL) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2761 | png_error(png_ptr, png_ptr->zstream.msg); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2762 | else |
| 2763 | png_error(png_ptr, "zlib error"); |
| 2764 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2765 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2766 | /* see if it is time to write another IDAT */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2767 | if (!(png_ptr->zstream.avail_out)) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2768 | { |
| 2769 | /* write the IDAT and reset the zlib output buffer */ |
| 2770 | png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2771 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 2772 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2773 | } |
| 2774 | /* repeat until all data has been compressed */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2775 | } while (png_ptr->zstream.avail_in); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2776 | |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 2777 | /* swap the current and previous rows */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2778 | if (png_ptr->prev_row != NULL) |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 2779 | { |
| 2780 | png_bytep tptr; |
| 2781 | |
| 2782 | tptr = png_ptr->prev_row; |
| 2783 | png_ptr->prev_row = png_ptr->row_buf; |
| 2784 | png_ptr->row_buf = tptr; |
| 2785 | } |
| 2786 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2787 | /* finish row - updates counters and flushes zlib if last row */ |
| 2788 | png_write_finish_row(png_ptr); |
| 2789 | |
| 2790 | #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
| 2791 | png_ptr->flush_rows++; |
| 2792 | |
| 2793 | if (png_ptr->flush_dist > 0 && |
| 2794 | png_ptr->flush_rows >= png_ptr->flush_dist) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2795 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2796 | png_write_flush(png_ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2797 | } |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2798 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2799 | } |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 2800 | #endif /* PNG_WRITE_SUPPORTED */ |