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 | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 4 | * libpng 1.0.5h - December 10, 1999 |
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 |
| 6 | * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
| 7 | * Copyright (c) 1996, 1997 Andreas Dilger |
Glenn Randers-Pehrson | c944229 | 1999-01-06 21:50:16 -0600 | [diff] [blame] | 8 | * Copyright (c) 1998, 1999 Glenn Randers-Pehrson |
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 | #define PNG_INTERNAL |
| 12 | #include "png.h" |
| 13 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 14 | /* Place a 32-bit number into a buffer in PNG byte order. We work |
| 15 | * with unsigned numbers for convenience, although one supported |
| 16 | * ancillary chunk uses signed (two's complement) numbers. |
| 17 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 18 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 19 | png_save_uint_32(png_bytep buf, png_uint_32 i) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 20 | { |
| 21 | buf[0] = (png_byte)((i >> 24) & 0xff); |
| 22 | buf[1] = (png_byte)((i >> 16) & 0xff); |
| 23 | buf[2] = (png_byte)((i >> 8) & 0xff); |
| 24 | buf[3] = (png_byte)(i & 0xff); |
| 25 | } |
| 26 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 27 | #if defined(PNG_WRITE_pCAL_SUPPORTED) |
| 28 | /* 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] | 29 | * complement format. If this isn't the case, then this routine needs to |
| 30 | * be modified to write data in two's complement format. |
| 31 | */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 32 | void |
| 33 | png_save_int_32(png_bytep buf, png_int_32 i) |
| 34 | { |
| 35 | buf[0] = (png_byte)((i >> 24) & 0xff); |
| 36 | buf[1] = (png_byte)((i >> 16) & 0xff); |
| 37 | buf[2] = (png_byte)((i >> 8) & 0xff); |
| 38 | buf[3] = (png_byte)(i & 0xff); |
| 39 | } |
| 40 | #endif |
| 41 | |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 42 | /* Place a 16-bit number into a buffer in PNG byte order. |
| 43 | * The parameter is declared unsigned int, not png_uint_16, |
| 44 | * just to avoid potential problems on pre-ANSI C compilers. |
| 45 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 46 | void |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 47 | png_save_uint_16(png_bytep buf, unsigned int i) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 48 | { |
| 49 | buf[0] = (png_byte)((i >> 8) & 0xff); |
| 50 | buf[1] = (png_byte)(i & 0xff); |
| 51 | } |
| 52 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 53 | /* 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] | 54 | * representing the chunk name. The array must be at least 4 bytes in |
| 55 | * length, and does not need to be null terminated. To be safe, pass the |
| 56 | * pre-defined chunk names here, and if you need a new one, define it |
| 57 | * where the others are defined. The length is the length of the data. |
| 58 | * All the data must be present. If that is not possible, use the |
| 59 | * png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end() |
| 60 | * functions instead. |
| 61 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 62 | void |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 63 | png_write_chunk(png_structp png_ptr, png_bytep chunk_name, |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 64 | png_bytep data, png_size_t length) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 65 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 66 | png_write_chunk_start(png_ptr, chunk_name, (png_uint_32)length); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 67 | png_write_chunk_data(png_ptr, data, length); |
| 68 | png_write_chunk_end(png_ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 69 | } |
| 70 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 71 | /* 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] | 72 | * The total_length is the sum of the lengths of all the data you will be |
| 73 | * passing in png_write_chunk_data(). |
| 74 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 75 | void |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 76 | png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name, |
| 77 | png_uint_32 length) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 78 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 79 | png_byte buf[4]; |
| 80 | png_debug2(0, "Writing %s chunk (%d bytes)\n", chunk_name, length); |
| 81 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 82 | /* write the length */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 83 | png_save_uint_32(buf, length); |
| 84 | png_write_data(png_ptr, buf, (png_size_t)4); |
| 85 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 86 | /* write the chunk name */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 87 | png_write_data(png_ptr, chunk_name, (png_size_t)4); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 88 | /* reset the crc and run it over the chunk name */ |
| 89 | png_reset_crc(png_ptr); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 90 | png_calculate_crc(png_ptr, chunk_name, (png_size_t)4); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 91 | } |
| 92 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 93 | /* 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] | 94 | * Note that multiple calls to this function are allowed, and that the |
| 95 | * sum of the lengths from these calls *must* add up to the total_length |
| 96 | * given to png_write_chunk_start(). |
| 97 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 98 | void |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 99 | 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] | 100 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 101 | /* write the data, and run the CRC over it */ |
| 102 | if (data != NULL && length > 0) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 103 | { |
| 104 | png_calculate_crc(png_ptr, data, length); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 105 | png_write_data(png_ptr, data, length); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 106 | } |
| 107 | } |
| 108 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 109 | /* Finish a chunk started with png_write_chunk_start(). */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 110 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 111 | png_write_chunk_end(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 112 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 113 | png_byte buf[4]; |
| 114 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 115 | /* write the crc */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 116 | png_save_uint_32(buf, png_ptr->crc); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 117 | |
| 118 | png_write_data(png_ptr, buf, (png_size_t)4); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 119 | } |
| 120 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 121 | /* Simple function to write the signature. If we have already written |
| 122 | * the magic bytes of the signature, or more likely, the PNG stream is |
| 123 | * being embedded into another stream and doesn't need its own signature, |
| 124 | * we should call png_set_sig_bytes() to tell libpng how many of the |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 125 | * bytes have already been written. |
| 126 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 127 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 128 | png_write_sig(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 129 | { |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 130 | png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10}; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 131 | /* write the rest of the 8 byte signature */ |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 132 | png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes], |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 133 | (png_size_t)8 - png_ptr->sig_bytes); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 134 | } |
| 135 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 136 | #if defined(PNG_WRITE_TEXT_SUPPORTED) |
| 137 | /* |
| 138 | * This pair of functions encapsulates the operation of (a) compressing a |
| 139 | * text string, and (b) issuing it later as a series of chunk data writes. |
| 140 | * The compression_state structure is shared context for these functions |
| 141 | * set up by the caller in order to make the whole mess thread-safe. |
| 142 | */ |
| 143 | |
| 144 | typedef struct |
| 145 | { |
| 146 | char *input; /* the uncompressed input data */ |
| 147 | int input_len; /* its length */ |
| 148 | int num_output_ptr; /* number of output pointers used */ |
| 149 | int max_output_ptr; /* size of output_ptr */ |
| 150 | png_charpp output_ptr; /* array of pointers to output */ |
| 151 | } compression_state; |
| 152 | |
| 153 | /* compress given text into storage in the png_ptr structure */ |
| 154 | static int |
| 155 | png_text_compress(png_structp png_ptr, |
| 156 | png_charp text, png_size_t text_len, int compression, |
| 157 | compression_state *comp) |
| 158 | { |
| 159 | int ret; |
| 160 | |
| 161 | comp->num_output_ptr = comp->max_output_ptr = 0; |
| 162 | comp->output_ptr = NULL; |
| 163 | comp->input = NULL; |
| 164 | |
| 165 | /* we may just want to pass the text right through */ |
| 166 | if (compression == PNG_TEXT_COMPRESSION_NONE) |
| 167 | { |
| 168 | comp->input = text; |
| 169 | comp->input_len = text_len; |
| 170 | return(text_len); |
| 171 | } |
| 172 | |
| 173 | if (compression >= PNG_TEXT_COMPRESSION_LAST) |
| 174 | { |
| 175 | #if !defined(PNG_NO_STDIO) |
| 176 | char msg[50]; |
| 177 | sprintf(msg, "Unknown compression type %d", compression); |
| 178 | png_warning(png_ptr, msg); |
| 179 | #else |
| 180 | png_warning(png_ptr, "Unknown compression type"); |
| 181 | #endif |
| 182 | compression = PNG_TEXT_COMPRESSION_zTXt; |
| 183 | } |
| 184 | |
| 185 | /* We can't write the chunk until we find out how much data we have, |
| 186 | * which means we need to run the compressor first and save the |
| 187 | * output. This shouldn't be a problem, as the vast majority of |
| 188 | * comments should be reasonable, but we will set up an array of |
| 189 | * malloc'd pointers to be sure. |
| 190 | * |
| 191 | * If we knew the application was well behaved, we could simplify this |
| 192 | * greatly by assuming we can always malloc an output buffer large |
| 193 | * enough to hold the compressed text ((1001 * text_len / 1000) + 12) |
| 194 | * and malloc this directly. The only time this would be a bad idea is |
| 195 | * if we can't malloc more than 64K and we have 64K of random input |
| 196 | * data, or if the input string is incredibly large (although this |
| 197 | * wouldn't cause a failure, just a slowdown due to swapping). |
| 198 | */ |
| 199 | |
| 200 | /* set up the compression buffers */ |
| 201 | png_ptr->zstream.avail_in = (uInt)text_len; |
| 202 | png_ptr->zstream.next_in = (Bytef *)text; |
| 203 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 204 | png_ptr->zstream.next_out = (Bytef *)png_ptr->zbuf; |
| 205 | |
| 206 | /* this is the same compression loop as in png_write_row() */ |
| 207 | do |
| 208 | { |
| 209 | /* compress the data */ |
| 210 | ret = deflate(&png_ptr->zstream, Z_NO_FLUSH); |
| 211 | if (ret != Z_OK) |
| 212 | { |
| 213 | /* error */ |
| 214 | if (png_ptr->zstream.msg != NULL) |
| 215 | png_error(png_ptr, png_ptr->zstream.msg); |
| 216 | else |
| 217 | png_error(png_ptr, "zlib error"); |
| 218 | } |
| 219 | /* check to see if we need more room */ |
| 220 | if (!png_ptr->zstream.avail_out && png_ptr->zstream.avail_in) |
| 221 | { |
| 222 | /* make sure the output array has room */ |
| 223 | if (comp->num_output_ptr >= comp->max_output_ptr) |
| 224 | { |
| 225 | int old_max; |
| 226 | |
| 227 | old_max = comp->max_output_ptr; |
| 228 | comp->max_output_ptr = comp->num_output_ptr + 4; |
| 229 | if (comp->output_ptr != NULL) |
| 230 | { |
| 231 | png_charpp old_ptr; |
| 232 | |
| 233 | old_ptr = comp->output_ptr; |
| 234 | comp->output_ptr = (png_charpp)png_malloc(png_ptr, |
| 235 | (png_uint_32)(comp->max_output_ptr * sizeof (png_charpp))); |
| 236 | png_memcpy(comp->output_ptr, old_ptr, |
| 237 | old_max * sizeof (png_charp)); |
| 238 | png_free(png_ptr, old_ptr); |
| 239 | } |
| 240 | else |
| 241 | comp->output_ptr = (png_charpp)png_malloc(png_ptr, |
| 242 | (png_uint_32)(comp->max_output_ptr * sizeof (png_charp))); |
| 243 | } |
| 244 | |
| 245 | /* save the data */ |
| 246 | comp->output_ptr[comp->num_output_ptr] = (png_charp)png_malloc(png_ptr, |
| 247 | (png_uint_32)png_ptr->zbuf_size); |
| 248 | png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf, |
| 249 | png_ptr->zbuf_size); |
| 250 | comp->num_output_ptr++; |
| 251 | |
| 252 | /* and reset the buffer */ |
| 253 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 254 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 255 | } |
| 256 | /* continue until we don't have any more to compress */ |
| 257 | } while (png_ptr->zstream.avail_in); |
| 258 | |
| 259 | /* finish the compression */ |
| 260 | do |
| 261 | { |
| 262 | /* tell zlib we are finished */ |
| 263 | ret = deflate(&png_ptr->zstream, Z_FINISH); |
| 264 | if (ret != Z_OK && ret != Z_STREAM_END) |
| 265 | { |
| 266 | /* we got an error */ |
| 267 | if (png_ptr->zstream.msg != NULL) |
| 268 | png_error(png_ptr, png_ptr->zstream.msg); |
| 269 | else |
| 270 | png_error(png_ptr, "zlib error"); |
| 271 | } |
| 272 | |
| 273 | /* check to see if we need more room */ |
| 274 | if (!(png_ptr->zstream.avail_out) && ret == Z_OK) |
| 275 | { |
| 276 | /* check to make sure our output array has room */ |
| 277 | if (comp->num_output_ptr >= comp->max_output_ptr) |
| 278 | { |
| 279 | int old_max; |
| 280 | |
| 281 | old_max = comp->max_output_ptr; |
| 282 | comp->max_output_ptr = comp->num_output_ptr + 4; |
| 283 | if (comp->output_ptr != NULL) |
| 284 | { |
| 285 | png_charpp old_ptr; |
| 286 | |
| 287 | old_ptr = comp->output_ptr; |
| 288 | /* This could be optimized to realloc() */ |
| 289 | comp->output_ptr = (png_charpp)png_malloc(png_ptr, |
| 290 | (png_uint_32)(comp->max_output_ptr * sizeof (png_charpp))); |
| 291 | png_memcpy(comp->output_ptr, old_ptr, |
| 292 | old_max * sizeof (png_charp)); |
| 293 | png_free(png_ptr, old_ptr); |
| 294 | } |
| 295 | else |
| 296 | comp->output_ptr = (png_charpp)png_malloc(png_ptr, |
| 297 | (png_uint_32)(comp->max_output_ptr * sizeof (png_charp))); |
| 298 | } |
| 299 | |
| 300 | /* save off the data */ |
| 301 | comp->output_ptr[comp->num_output_ptr] = (png_charp)png_malloc(png_ptr, |
| 302 | (png_uint_32)png_ptr->zbuf_size); |
| 303 | png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf, |
| 304 | png_ptr->zbuf_size); |
| 305 | comp->num_output_ptr++; |
| 306 | |
| 307 | /* and reset the buffer pointers */ |
| 308 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 309 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 310 | } |
| 311 | } while (ret != Z_STREAM_END); |
| 312 | |
| 313 | /* text length is number of buffers plus last buffer */ |
| 314 | text_len = png_ptr->zbuf_size * comp->num_output_ptr; |
| 315 | if (png_ptr->zstream.avail_out < png_ptr->zbuf_size) |
| 316 | text_len += png_ptr->zbuf_size - (png_size_t)png_ptr->zstream.avail_out; |
| 317 | |
| 318 | return(text_len); |
| 319 | } |
| 320 | |
| 321 | /* ship the compressed text out via chunk writes */ |
| 322 | static void |
| 323 | png_write_compressed_data_out(png_structp png_ptr, compression_state *comp) |
| 324 | { |
| 325 | int i; |
| 326 | |
| 327 | /* handle the no-compression case */ |
| 328 | if (comp->input) |
| 329 | { |
| 330 | png_write_chunk_data(png_ptr, (png_bytep)comp->input, comp->input_len); |
| 331 | return; |
| 332 | } |
| 333 | |
| 334 | /* write saved output buffers, if any */ |
| 335 | for (i = 0; i < comp->num_output_ptr; i++) |
| 336 | { |
| 337 | png_write_chunk_data(png_ptr,(png_bytep)comp->output_ptr[i],png_ptr->zbuf_size); |
| 338 | png_free(png_ptr, comp->output_ptr[i]); |
| 339 | } |
| 340 | if (comp->max_output_ptr != 0) |
| 341 | png_free(png_ptr, comp->output_ptr); |
| 342 | /* write anything left in zbuf */ |
| 343 | if (png_ptr->zstream.avail_out < (png_uint_32)png_ptr->zbuf_size) |
| 344 | png_write_chunk_data(png_ptr, png_ptr->zbuf, |
| 345 | png_ptr->zbuf_size - png_ptr->zstream.avail_out); |
| 346 | |
| 347 | /* reset zlib for another zTXt/iTXt or the image data */ |
| 348 | deflateReset(&png_ptr->zstream); |
| 349 | |
| 350 | } |
| 351 | #endif |
| 352 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 353 | /* 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] | 354 | * information. Note that the rest of this code depends upon this |
| 355 | * information being correct. |
| 356 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 357 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 358 | 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] | 359 | int bit_depth, int color_type, int compression_type, int filter_type, |
| 360 | int interlace_type) |
| 361 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 362 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 363 | PNG_IHDR; |
| 364 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 365 | png_byte buf[13]; /* buffer to store the IHDR info */ |
| 366 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 367 | png_debug(1, "in png_write_IHDR\n"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 368 | /* Check that we have valid input data from the application info */ |
| 369 | switch (color_type) |
| 370 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 371 | case PNG_COLOR_TYPE_GRAY: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 372 | switch (bit_depth) |
| 373 | { |
| 374 | case 1: |
| 375 | case 2: |
| 376 | case 4: |
| 377 | case 8: |
| 378 | case 16: png_ptr->channels = 1; break; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 379 | default: png_error(png_ptr,"Invalid bit depth for grayscale image"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 380 | } |
| 381 | break; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 382 | case PNG_COLOR_TYPE_RGB: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 383 | if (bit_depth != 8 && bit_depth != 16) |
| 384 | png_error(png_ptr, "Invalid bit depth for RGB image"); |
| 385 | png_ptr->channels = 3; |
| 386 | break; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 387 | case PNG_COLOR_TYPE_PALETTE: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 388 | switch (bit_depth) |
| 389 | { |
| 390 | case 1: |
| 391 | case 2: |
| 392 | case 4: |
| 393 | case 8: png_ptr->channels = 1; break; |
| 394 | default: png_error(png_ptr, "Invalid bit depth for paletted image"); |
| 395 | } |
| 396 | break; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 397 | case PNG_COLOR_TYPE_GRAY_ALPHA: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 398 | if (bit_depth != 8 && bit_depth != 16) |
| 399 | png_error(png_ptr, "Invalid bit depth for grayscale+alpha image"); |
| 400 | png_ptr->channels = 2; |
| 401 | break; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 402 | case PNG_COLOR_TYPE_RGB_ALPHA: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 403 | if (bit_depth != 8 && bit_depth != 16) |
| 404 | png_error(png_ptr, "Invalid bit depth for RGBA image"); |
| 405 | png_ptr->channels = 4; |
| 406 | break; |
| 407 | default: |
| 408 | png_error(png_ptr, "Invalid image color type specified"); |
| 409 | } |
| 410 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 411 | if (compression_type != PNG_COMPRESSION_TYPE_BASE) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 412 | { |
| 413 | png_warning(png_ptr, "Invalid compression type specified"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 414 | compression_type = PNG_COMPRESSION_TYPE_BASE; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 415 | } |
| 416 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 417 | if (filter_type != PNG_FILTER_TYPE_BASE) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 418 | { |
| 419 | png_warning(png_ptr, "Invalid filter type specified"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 420 | filter_type = PNG_FILTER_TYPE_BASE; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 421 | } |
| 422 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 423 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 424 | if (interlace_type != PNG_INTERLACE_NONE && |
| 425 | interlace_type != PNG_INTERLACE_ADAM7) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 426 | { |
| 427 | png_warning(png_ptr, "Invalid interlace type specified"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 428 | interlace_type = PNG_INTERLACE_ADAM7; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 429 | } |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 430 | #else |
| 431 | interlace_type=PNG_INTERLACE_NONE; |
| 432 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 433 | |
| 434 | /* save off the relevent information */ |
| 435 | png_ptr->bit_depth = (png_byte)bit_depth; |
| 436 | png_ptr->color_type = (png_byte)color_type; |
| 437 | png_ptr->interlaced = (png_byte)interlace_type; |
| 438 | png_ptr->width = width; |
| 439 | png_ptr->height = height; |
| 440 | |
| 441 | png_ptr->pixel_depth = (png_byte)(bit_depth * png_ptr->channels); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 442 | png_ptr->rowbytes = ((width * (png_size_t)png_ptr->pixel_depth + 7) >> 3); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 443 | /* set the usr info, so any transformations can modify it */ |
| 444 | png_ptr->usr_width = png_ptr->width; |
| 445 | png_ptr->usr_bit_depth = png_ptr->bit_depth; |
| 446 | png_ptr->usr_channels = png_ptr->channels; |
| 447 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 448 | /* pack the header information into the buffer */ |
| 449 | png_save_uint_32(buf, width); |
| 450 | png_save_uint_32(buf + 4, height); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 451 | buf[8] = (png_byte)bit_depth; |
| 452 | buf[9] = (png_byte)color_type; |
| 453 | buf[10] = (png_byte)compression_type; |
| 454 | buf[11] = (png_byte)filter_type; |
| 455 | buf[12] = (png_byte)interlace_type; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 456 | |
| 457 | /* write the chunk */ |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 458 | 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] | 459 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 460 | /* initialize zlib with PNG info */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 461 | png_ptr->zstream.zalloc = png_zalloc; |
| 462 | png_ptr->zstream.zfree = png_zfree; |
| 463 | png_ptr->zstream.opaque = (voidpf)png_ptr; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 464 | if (!(png_ptr->do_filter)) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 465 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 466 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE || |
| 467 | png_ptr->bit_depth < 8) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 468 | png_ptr->do_filter = PNG_FILTER_NONE; |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 469 | else |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 470 | png_ptr->do_filter = PNG_ALL_FILTERS; |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 471 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 472 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY)) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 473 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 474 | if (png_ptr->do_filter != PNG_FILTER_NONE) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 475 | png_ptr->zlib_strategy = Z_FILTERED; |
| 476 | else |
| 477 | png_ptr->zlib_strategy = Z_DEFAULT_STRATEGY; |
| 478 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 479 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_LEVEL)) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 480 | png_ptr->zlib_level = Z_DEFAULT_COMPRESSION; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 481 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL)) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 482 | png_ptr->zlib_mem_level = 8; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 483 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS)) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 484 | png_ptr->zlib_window_bits = 15; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 485 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_METHOD)) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 486 | png_ptr->zlib_method = 8; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 487 | deflateInit2(&png_ptr->zstream, png_ptr->zlib_level, |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 488 | png_ptr->zlib_method, png_ptr->zlib_window_bits, |
| 489 | png_ptr->zlib_mem_level, png_ptr->zlib_strategy); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 490 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 491 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 492 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 493 | png_ptr->mode = PNG_HAVE_IHDR; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 494 | } |
| 495 | |
| 496 | /* 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] | 497 | * 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] | 498 | * structure. |
| 499 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 500 | void |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 501 | 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] | 502 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 503 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 504 | PNG_PLTE; |
| 505 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 506 | png_uint_32 i; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 507 | png_colorp pal_ptr; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 508 | png_byte buf[3]; |
| 509 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 510 | png_debug(1, "in png_write_PLTE\n"); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 511 | if (( |
| 512 | #ifdef PNG_WRITE_EMPTY_PLTE_SUPPORTED |
| 513 | !png_ptr->empty_plte_permitted && |
| 514 | #endif |
| 515 | num_pal == 0) || num_pal > 256) |
| 516 | { |
| 517 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 518 | { |
| 519 | png_error(png_ptr, "Invalid number of colors in palette"); |
| 520 | } |
| 521 | else |
| 522 | { |
| 523 | png_warning(png_ptr, "Invalid number of colors in palette"); |
| 524 | return; |
| 525 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 526 | } |
| 527 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 528 | png_ptr->num_palette = (png_uint_16)num_pal; |
| 529 | png_debug1(3, "num_palette = %d\n", png_ptr->num_palette); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 530 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 531 | png_write_chunk_start(png_ptr, (png_bytep)png_PLTE, num_pal * 3); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 532 | for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 533 | { |
| 534 | buf[0] = pal_ptr->red; |
| 535 | buf[1] = pal_ptr->green; |
| 536 | buf[2] = pal_ptr->blue; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 537 | png_write_chunk_data(png_ptr, buf, (png_size_t)3); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 538 | } |
| 539 | png_write_chunk_end(png_ptr); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 540 | png_ptr->mode |= PNG_HAVE_PLTE; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 541 | } |
| 542 | |
| 543 | /* write an IDAT chunk */ |
| 544 | void |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 545 | 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] | 546 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 547 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 548 | PNG_IDAT; |
| 549 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 550 | png_debug(1, "in png_write_IDAT\n"); |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 551 | png_write_chunk(png_ptr, (png_bytep)png_IDAT, data, length); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 552 | png_ptr->mode |= PNG_HAVE_IDAT; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 553 | } |
| 554 | |
| 555 | /* write an IEND chunk */ |
| 556 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 557 | png_write_IEND(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 558 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 559 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 560 | PNG_IEND; |
| 561 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 562 | png_debug(1, "in png_write_IEND\n"); |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 563 | png_write_chunk(png_ptr, (png_bytep)png_IEND, NULL, (png_size_t)0); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 564 | png_ptr->mode |= PNG_HAVE_IEND; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 565 | } |
| 566 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 567 | #if defined(PNG_WRITE_gAMA_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 568 | /* write a gAMA chunk */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 569 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 570 | void |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 571 | png_write_gAMA(png_structp png_ptr, double file_gamma) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 572 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 573 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 574 | PNG_gAMA; |
| 575 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 576 | png_uint_32 igamma; |
| 577 | png_byte buf[4]; |
| 578 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 579 | png_debug(1, "in png_write_gAMA\n"); |
Glenn Randers-Pehrson | 8f8fb6a | 1998-03-09 23:02:06 -0600 | [diff] [blame] | 580 | /* file_gamma is saved in 1/1000000ths */ |
Glenn Randers-Pehrson | 397100e | 1998-03-07 19:45:37 -0600 | [diff] [blame] | 581 | igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 582 | png_save_uint_32(buf, igamma); |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 583 | 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] | 584 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 585 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 586 | void |
| 587 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 588 | png_write_gAMA_fixed(png_structp png_ptr, png_uint_32 file_gamma) |
| 589 | { |
| 590 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 591 | PNG_gAMA; |
| 592 | #endif |
| 593 | png_byte buf[4]; |
| 594 | |
| 595 | png_debug(1, "in png_write_gAMA\n"); |
| 596 | /* file_gamma is saved in 1/1000000ths */ |
| 597 | png_save_uint_32(buf, file_gamma); |
| 598 | png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4); |
| 599 | } |
| 600 | #endif |
| 601 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 602 | |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 603 | #if defined(PNG_WRITE_sRGB_SUPPORTED) |
| 604 | /* write a sRGB chunk */ |
| 605 | void |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 606 | png_write_sRGB(png_structp png_ptr, int srgb_intent) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 607 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 608 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 609 | PNG_sRGB; |
| 610 | #endif |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 611 | png_byte buf[1]; |
| 612 | |
| 613 | png_debug(1, "in png_write_sRGB\n"); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 614 | if(srgb_intent >= PNG_sRGB_INTENT_LAST) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 615 | png_warning(png_ptr, |
| 616 | "Invalid sRGB rendering intent specified"); |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 617 | buf[0]=(png_byte)srgb_intent; |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 618 | 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] | 619 | } |
| 620 | #endif |
| 621 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 622 | #if defined(PNG_WRITE_iCCP_SUPPORTED) |
| 623 | /* write an iCCP chunk */ |
| 624 | void |
| 625 | png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type, |
| 626 | png_charp profile, int profile_len) |
| 627 | { |
| 628 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 629 | PNG_iCCP; |
| 630 | #endif |
| 631 | png_size_t name_len; |
| 632 | png_charp new_name; |
| 633 | compression_state comp; |
| 634 | |
| 635 | png_debug(1, "in png_write_iCCP\n"); |
| 636 | if (name == NULL || (name_len = png_check_keyword(png_ptr, name, |
| 637 | &new_name)) == 0) |
| 638 | { |
| 639 | png_warning(png_ptr, "Empty keyword in iCCP chunk"); |
| 640 | return; |
| 641 | } |
| 642 | |
| 643 | if (compression_type) |
| 644 | /* ignore */ ; |
| 645 | |
| 646 | if (profile == NULL || *profile == '\0') |
| 647 | profile_len = 0; |
| 648 | |
| 649 | if (profile_len) |
| 650 | profile_len = png_text_compress(png_ptr, profile, profile_len, |
| 651 | PNG_TEXT_COMPRESSION_zTXt, &comp); |
| 652 | |
| 653 | /* make sure we include the NULL after the name and the compression type */ |
| 654 | png_write_chunk_start(png_ptr, (png_bytep)png_iCCP, |
| 655 | (png_uint_32)name_len+profile_len+2); |
| 656 | png_write_chunk_data(png_ptr, (png_bytep)new_name, name_len + 2); |
| 657 | |
| 658 | if (profile_len) |
| 659 | png_write_compressed_data_out(png_ptr, &comp); |
| 660 | |
| 661 | png_write_chunk_end(png_ptr); |
| 662 | png_free(png_ptr, new_name); |
| 663 | } |
| 664 | #endif |
| 665 | |
| 666 | #if defined(PNG_WRITE_sPLT_SUPPORTED) |
| 667 | /* write a sPLT chunk */ |
| 668 | void |
| 669 | png_write_sPLT(png_structp png_ptr, png_spalette_p spalette) |
| 670 | { |
| 671 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 672 | PNG_sPLT; |
| 673 | #endif |
| 674 | png_size_t name_len; |
| 675 | png_charp new_name; |
| 676 | png_byte entrybuf[10]; |
| 677 | int entry_size = (spalette->depth == 8 ? 6 : 10); |
| 678 | int palette_size = entry_size * spalette->nentries; |
| 679 | png_spalette_entryp ep; |
| 680 | |
| 681 | png_debug(1, "in png_write_sPLT\n"); |
| 682 | if (spalette->name == NULL || (name_len = png_check_keyword(png_ptr, spalette->name, &new_name))==0) |
| 683 | { |
| 684 | png_warning(png_ptr, "Empty keyword in sPLT chunk"); |
| 685 | return; |
| 686 | } |
| 687 | |
| 688 | /* make sure we include the NULL after the name */ |
| 689 | png_write_chunk_start(png_ptr, (png_bytep) png_sPLT, |
| 690 | (png_uint_32)(name_len + 1 + palette_size)); |
| 691 | png_write_chunk_data(png_ptr, (png_bytep)new_name, name_len + 1); |
| 692 | |
| 693 | /* loop through each palette entry, writing appropriately */ |
| 694 | for (ep = spalette->entries; ep<spalette->entries+spalette->nentries; ep++) |
| 695 | { |
| 696 | if (spalette->depth == 8) |
| 697 | { |
| 698 | entrybuf[0] = (png_byte)ep->red; |
| 699 | entrybuf[1] = (png_byte)ep->green; |
| 700 | entrybuf[2] = (png_byte)ep->blue; |
| 701 | entrybuf[3] = (png_byte)ep->alpha; |
| 702 | png_save_uint_16(entrybuf + 4, ep->frequency); |
| 703 | } |
| 704 | else |
| 705 | { |
| 706 | png_save_uint_16(entrybuf + 0, ep->red); |
| 707 | png_save_uint_16(entrybuf + 2, ep->green); |
| 708 | png_save_uint_16(entrybuf + 4, ep->blue); |
| 709 | png_save_uint_16(entrybuf + 6, ep->alpha); |
| 710 | png_save_uint_16(entrybuf + 8, ep->frequency); |
| 711 | } |
| 712 | png_write_chunk_data(png_ptr, entrybuf, entry_size); |
| 713 | } |
| 714 | |
| 715 | png_write_chunk_end(png_ptr); |
| 716 | png_free(png_ptr, new_name); |
| 717 | } |
| 718 | #endif |
| 719 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 720 | #if defined(PNG_WRITE_sBIT_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 721 | /* write the sBIT chunk */ |
| 722 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 723 | 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] | 724 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 725 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 726 | PNG_sBIT; |
| 727 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 728 | png_byte buf[4]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 729 | png_size_t size; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 730 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 731 | png_debug(1, "in png_write_sBIT\n"); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 732 | /* 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] | 733 | if (color_type & PNG_COLOR_MASK_COLOR) |
| 734 | { |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 735 | png_byte maxbits; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 736 | |
Glenn Randers-Pehrson | 860ab2b | 1999-10-14 07:43:10 -0500 | [diff] [blame] | 737 | maxbits = (png_byte)(color_type==PNG_COLOR_TYPE_PALETTE ? 8 : |
| 738 | png_ptr->usr_bit_depth); |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 739 | if (sbit->red == 0 || sbit->red > maxbits || |
| 740 | sbit->green == 0 || sbit->green > maxbits || |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 741 | sbit->blue == 0 || sbit->blue > maxbits) |
| 742 | { |
| 743 | png_warning(png_ptr, "Invalid sBIT depth specified"); |
| 744 | return; |
| 745 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 746 | buf[0] = sbit->red; |
| 747 | buf[1] = sbit->green; |
| 748 | buf[2] = sbit->blue; |
| 749 | size = 3; |
| 750 | } |
| 751 | else |
| 752 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 753 | if (sbit->gray == 0 || sbit->gray > png_ptr->usr_bit_depth) |
| 754 | { |
| 755 | png_warning(png_ptr, "Invalid sBIT depth specified"); |
| 756 | return; |
| 757 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 758 | buf[0] = sbit->gray; |
| 759 | size = 1; |
| 760 | } |
| 761 | |
| 762 | if (color_type & PNG_COLOR_MASK_ALPHA) |
| 763 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 764 | if (sbit->alpha == 0 || sbit->alpha > png_ptr->usr_bit_depth) |
| 765 | { |
| 766 | png_warning(png_ptr, "Invalid sBIT depth specified"); |
| 767 | return; |
| 768 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 769 | buf[size++] = sbit->alpha; |
| 770 | } |
| 771 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 772 | png_write_chunk(png_ptr, (png_bytep)png_sBIT, buf, size); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 773 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 774 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 775 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 776 | #if defined(PNG_WRITE_cHRM_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 777 | /* write the cHRM chunk */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 778 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 779 | void |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 780 | 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] | 781 | double red_x, double red_y, double green_x, double green_y, |
| 782 | double blue_x, double blue_y) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 783 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 784 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 785 | PNG_cHRM; |
| 786 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 787 | png_uint_32 itemp; |
| 788 | png_byte buf[32]; |
| 789 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 790 | png_debug(1, "in png_write_cHRM\n"); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 791 | /* each value is saved in 1/1000000ths */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 792 | if (white_x < 0 || white_x > 0.8 || white_y < 0 || white_y > 0.8 || |
| 793 | white_x + white_y > 1.0) |
| 794 | { |
| 795 | png_warning(png_ptr, "Invalid cHRM white point specified"); |
| 796 | return; |
| 797 | } |
Glenn Randers-Pehrson | 397100e | 1998-03-07 19:45:37 -0600 | [diff] [blame] | 798 | itemp = (png_uint_32)(white_x * 100000.0 + 0.5); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 799 | png_save_uint_32(buf, itemp); |
Glenn Randers-Pehrson | 397100e | 1998-03-07 19:45:37 -0600 | [diff] [blame] | 800 | itemp = (png_uint_32)(white_y * 100000.0 + 0.5); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 801 | png_save_uint_32(buf + 4, itemp); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 802 | |
| 803 | if (red_x < 0 || red_x > 0.8 || red_y < 0 || red_y > 0.8 || |
| 804 | red_x + red_y > 1.0) |
| 805 | { |
| 806 | png_warning(png_ptr, "Invalid cHRM red point specified"); |
| 807 | return; |
| 808 | } |
Glenn Randers-Pehrson | 397100e | 1998-03-07 19:45:37 -0600 | [diff] [blame] | 809 | itemp = (png_uint_32)(red_x * 100000.0 + 0.5); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 810 | png_save_uint_32(buf + 8, itemp); |
Glenn Randers-Pehrson | 397100e | 1998-03-07 19:45:37 -0600 | [diff] [blame] | 811 | itemp = (png_uint_32)(red_y * 100000.0 + 0.5); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 812 | png_save_uint_32(buf + 12, itemp); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 813 | |
| 814 | if (green_x < 0 || green_x > 0.8 || green_y < 0 || green_y > 0.8 || |
| 815 | green_x + green_y > 1.0) |
| 816 | { |
| 817 | png_warning(png_ptr, "Invalid cHRM green point specified"); |
| 818 | return; |
| 819 | } |
Glenn Randers-Pehrson | 397100e | 1998-03-07 19:45:37 -0600 | [diff] [blame] | 820 | itemp = (png_uint_32)(green_x * 100000.0 + 0.5); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 821 | png_save_uint_32(buf + 16, itemp); |
Glenn Randers-Pehrson | 397100e | 1998-03-07 19:45:37 -0600 | [diff] [blame] | 822 | itemp = (png_uint_32)(green_y * 100000.0 + 0.5); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 823 | png_save_uint_32(buf + 20, itemp); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 824 | |
| 825 | if (blue_x < 0 || blue_x > 0.8 || blue_y < 0 || blue_y > 0.8 || |
| 826 | blue_x + blue_y > 1.0) |
| 827 | { |
| 828 | png_warning(png_ptr, "Invalid cHRM blue point specified"); |
| 829 | return; |
| 830 | } |
Glenn Randers-Pehrson | 397100e | 1998-03-07 19:45:37 -0600 | [diff] [blame] | 831 | itemp = (png_uint_32)(blue_x * 100000.0 + 0.5); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 832 | png_save_uint_32(buf + 24, itemp); |
Glenn Randers-Pehrson | 397100e | 1998-03-07 19:45:37 -0600 | [diff] [blame] | 833 | itemp = (png_uint_32)(blue_y * 100000.0 + 0.5); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 834 | png_save_uint_32(buf + 28, itemp); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 835 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 836 | png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 837 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 838 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 839 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 840 | void |
| 841 | png_write_cHRM_fixed(png_structp png_ptr, png_uint_32 white_x, |
| 842 | png_uint_32 white_y, png_uint_32 red_x, png_uint_32 red_y, |
| 843 | png_uint_32 green_x, png_uint_32 green_y, png_uint_32 blue_x, |
| 844 | png_uint_32 blue_y) |
| 845 | { |
| 846 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 847 | PNG_cHRM; |
| 848 | #endif |
| 849 | png_uint_32 itemp; |
| 850 | png_byte buf[32]; |
| 851 | |
| 852 | png_debug(1, "in png_write_cHRM\n"); |
| 853 | /* each value is saved int 1/1000000ths */ |
| 854 | if (white_x > 80000L || white_y > 80000L || white_x + white_y > 100000L) |
| 855 | { |
| 856 | png_warning(png_ptr, "Invalid cHRM white point specified"); |
| 857 | return; |
| 858 | } |
| 859 | png_save_uint_32(buf, white_x); |
| 860 | png_save_uint_32(buf + 4, white_y); |
| 861 | |
| 862 | if (red_x > 80000L || red_y > 80000L || red_x + red_y > 100000L) |
| 863 | { |
| 864 | png_warning(png_ptr, "Invalid cHRM red point specified"); |
| 865 | return; |
| 866 | } |
| 867 | png_save_uint_32(buf + 8, red_x); |
| 868 | png_save_uint_32(buf + 12, red_y); |
| 869 | |
| 870 | if (green_x > 80000L || green_y > 80000L || green_x + green_y > 100000L) |
| 871 | { |
| 872 | png_warning(png_ptr, "Invalid cHRM green point specified"); |
| 873 | return; |
| 874 | } |
| 875 | png_save_uint_32(buf + 16, green_x); |
| 876 | png_save_uint_32(buf + 20, green_y); |
| 877 | |
| 878 | if (blue_x > 80000L || blue_y > 80000L || blue_x + blue_y > 100000L) |
| 879 | { |
| 880 | png_warning(png_ptr, "Invalid cHRM blue point specified"); |
| 881 | return; |
| 882 | } |
| 883 | png_save_uint_32(buf + 24, blue_x); |
| 884 | png_save_uint_32(buf + 28, blue_y); |
| 885 | |
| 886 | png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32); |
| 887 | } |
| 888 | #endif |
| 889 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 890 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 891 | #if defined(PNG_WRITE_tRNS_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 892 | /* write the tRNS chunk */ |
| 893 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 894 | 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] | 895 | int num_trans, int color_type) |
| 896 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 897 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 898 | PNG_tRNS; |
| 899 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 900 | png_byte buf[6]; |
| 901 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 902 | png_debug(1, "in png_write_tRNS\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 903 | if (color_type == PNG_COLOR_TYPE_PALETTE) |
| 904 | { |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 905 | if (num_trans <= 0 || num_trans > (int)png_ptr->num_palette) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 906 | { |
| 907 | png_warning(png_ptr,"Invalid number of transparent colors specified"); |
| 908 | return; |
| 909 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 910 | /* write the chunk out as it is */ |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 911 | png_write_chunk(png_ptr, (png_bytep)png_tRNS, trans, (png_size_t)num_trans); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 912 | } |
| 913 | else if (color_type == PNG_COLOR_TYPE_GRAY) |
| 914 | { |
| 915 | /* one 16 bit value */ |
| 916 | png_save_uint_16(buf, tran->gray); |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 917 | 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] | 918 | } |
| 919 | else if (color_type == PNG_COLOR_TYPE_RGB) |
| 920 | { |
| 921 | /* three 16 bit values */ |
| 922 | png_save_uint_16(buf, tran->red); |
| 923 | png_save_uint_16(buf + 2, tran->green); |
| 924 | png_save_uint_16(buf + 4, tran->blue); |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 925 | 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] | 926 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 927 | else |
| 928 | { |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 929 | png_warning(png_ptr, "Can't write tRNS with an alpha channel"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 930 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 931 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 932 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 933 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 934 | #if defined(PNG_WRITE_bKGD_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 935 | /* write the background chunk */ |
| 936 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 937 | 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] | 938 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 939 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 940 | PNG_bKGD; |
| 941 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 942 | png_byte buf[6]; |
| 943 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 944 | png_debug(1, "in png_write_bKGD\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 945 | if (color_type == PNG_COLOR_TYPE_PALETTE) |
| 946 | { |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 947 | if ( |
| 948 | #ifdef PNG_WRITE_EMPTY_PLTE_SUPPORTED |
| 949 | (!png_ptr->empty_plte_permitted || |
| 950 | (png_ptr->empty_plte_permitted && png_ptr->num_palette)) && |
| 951 | #endif |
| 952 | back->index > png_ptr->num_palette) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 953 | { |
| 954 | png_warning(png_ptr, "Invalid background palette index"); |
| 955 | return; |
| 956 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 957 | buf[0] = back->index; |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 958 | 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] | 959 | } |
| 960 | else if (color_type & PNG_COLOR_MASK_COLOR) |
| 961 | { |
| 962 | png_save_uint_16(buf, back->red); |
| 963 | png_save_uint_16(buf + 2, back->green); |
| 964 | png_save_uint_16(buf + 4, back->blue); |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 965 | 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] | 966 | } |
| 967 | else |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 968 | { |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 969 | png_save_uint_16(buf, back->gray); |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 970 | 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] | 971 | } |
| 972 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 973 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 974 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 975 | #if defined(PNG_WRITE_hIST_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 976 | /* write the histogram */ |
| 977 | void |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 978 | 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] | 979 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 980 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 981 | PNG_hIST; |
| 982 | #endif |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 983 | int i; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 984 | png_byte buf[3]; |
| 985 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 986 | png_debug(1, "in png_write_hIST\n"); |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 987 | if (num_hist > (int)png_ptr->num_palette) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 988 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 989 | png_debug2(3, "num_hist = %d, num_palette = %d\n", num_hist, |
| 990 | png_ptr->num_palette); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 991 | png_warning(png_ptr, "Invalid number of histogram entries specified"); |
| 992 | return; |
| 993 | } |
| 994 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 995 | png_write_chunk_start(png_ptr, (png_bytep)png_hIST, (png_uint_32)(num_hist * 2)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 996 | for (i = 0; i < num_hist; i++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 997 | { |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 998 | png_save_uint_16(buf, hist[i]); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 999 | png_write_chunk_data(png_ptr, buf, (png_size_t)2); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1000 | } |
| 1001 | png_write_chunk_end(png_ptr); |
| 1002 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1003 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1004 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 1005 | #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ |
| 1006 | defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1007 | /* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification, |
| 1008 | * and if invalid, correct the keyword rather than discarding the entire |
| 1009 | * chunk. The PNG 1.0 specification requires keywords 1-79 characters in |
| 1010 | * length, forbids leading or trailing whitespace, multiple internal spaces, |
| 1011 | * 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] | 1012 | * |
| 1013 | * The new_key is allocated to hold the corrected keyword and must be freed |
| 1014 | * by the calling routine. This avoids problems with trying to write to |
| 1015 | * static keywords without having to have duplicate copies of the strings. |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1016 | */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1017 | png_size_t |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1018 | 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] | 1019 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1020 | png_size_t key_len; |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1021 | png_charp kp, dp; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1022 | int kflag; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1023 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1024 | png_debug(1, "in png_check_keyword\n"); |
| 1025 | *new_key = NULL; |
| 1026 | |
| 1027 | if (key == NULL || (key_len = png_strlen(key)) == 0) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1028 | { |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1029 | png_chunk_warning(png_ptr, "zero length keyword"); |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 1030 | return ((png_size_t)0); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1031 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1032 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1033 | png_debug1(2, "Keyword to be checked is '%s'\n", key); |
| 1034 | |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1035 | *new_key = (png_charp)png_malloc(png_ptr, (png_uint_32)(key_len + 1)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1036 | |
| 1037 | /* Replace non-printing characters with a blank and print a warning */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1038 | for (kp = key, dp = *new_key; *kp != '\0'; kp++, dp++) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1039 | { |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1040 | if (*kp < 0x20 || (*kp > 0x7E && (png_byte)*kp < 0xA1)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1041 | { |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1042 | #if !defined(PNG_NO_STDIO) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1043 | char msg[40]; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1044 | |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1045 | sprintf(msg, "invalid keyword character 0x%02X", *kp); |
| 1046 | png_chunk_warning(png_ptr, msg); |
| 1047 | #else |
| 1048 | png_chunk_warning(png_ptr, "invalid character in keyword"); |
| 1049 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1050 | *dp = ' '; |
| 1051 | } |
| 1052 | else |
| 1053 | { |
| 1054 | *dp = *kp; |
| 1055 | } |
| 1056 | } |
| 1057 | *dp = '\0'; |
| 1058 | |
| 1059 | /* Remove any trailing white space. */ |
| 1060 | kp = *new_key + key_len - 1; |
| 1061 | if (*kp == ' ') |
| 1062 | { |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1063 | png_chunk_warning(png_ptr, "trailing spaces removed from keyword"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1064 | |
| 1065 | while (*kp == ' ') |
| 1066 | { |
| 1067 | *(kp--) = '\0'; |
| 1068 | key_len--; |
| 1069 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1070 | } |
| 1071 | |
| 1072 | /* Remove any leading white space. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1073 | kp = *new_key; |
| 1074 | if (*kp == ' ') |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1075 | { |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1076 | png_chunk_warning(png_ptr, "leading spaces removed from keyword"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1077 | |
| 1078 | while (*kp == ' ') |
| 1079 | { |
| 1080 | kp++; |
| 1081 | key_len--; |
| 1082 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1083 | } |
| 1084 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1085 | png_debug1(2, "Checking for multiple internal spaces in '%s'\n", kp); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1086 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1087 | /* Remove multiple internal spaces. */ |
| 1088 | for (kflag = 0, dp = *new_key; *kp != '\0'; kp++) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1089 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1090 | if (*kp == ' ' && kflag == 0) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1091 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1092 | *(dp++) = *kp; |
| 1093 | kflag = 1; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1094 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1095 | else if (*kp == ' ') |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1096 | { |
| 1097 | key_len--; |
| 1098 | } |
| 1099 | else |
| 1100 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1101 | *(dp++) = *kp; |
| 1102 | kflag = 0; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1103 | } |
| 1104 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1105 | *dp = '\0'; |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1106 | |
| 1107 | if (key_len == 0) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1108 | { |
Glenn Randers-Pehrson | 6d8f3b0 | 1999-10-23 08:39:18 -0500 | [diff] [blame] | 1109 | png_free(png_ptr, *new_key); |
| 1110 | *new_key=NULL; |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1111 | png_chunk_warning(png_ptr, "zero length keyword"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1112 | } |
| 1113 | |
| 1114 | if (key_len > 79) |
| 1115 | { |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1116 | png_chunk_warning(png_ptr, "keyword length must be 1 - 79 characters"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1117 | new_key[79] = '\0'; |
| 1118 | key_len = 79; |
| 1119 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1120 | |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 1121 | return (key_len); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1122 | } |
| 1123 | #endif |
| 1124 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1125 | #if defined(PNG_WRITE_tEXt_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1126 | /* write a tEXt chunk */ |
| 1127 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1128 | 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] | 1129 | png_size_t text_len) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1130 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1131 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1132 | PNG_tEXt; |
| 1133 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1134 | png_size_t key_len; |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1135 | png_charp new_key; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1136 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1137 | png_debug(1, "in png_write_tEXt\n"); |
| 1138 | if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0) |
| 1139 | { |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1140 | png_warning(png_ptr, "Empty keyword in tEXt chunk"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1141 | return; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1142 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1143 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1144 | if (text == NULL || *text == '\0') |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1145 | text_len = 0; |
| 1146 | |
| 1147 | /* make sure we include the 0 after the key */ |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1148 | png_write_chunk_start(png_ptr, (png_bytep)png_tEXt, (png_uint_32)key_len+text_len+1); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1149 | /* |
| 1150 | * We leave it to the application to meet PNG-1.0 requirements on the |
| 1151 | * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of |
| 1152 | * 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^] | 1153 | * 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] | 1154 | */ |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1155 | png_write_chunk_data(png_ptr, (png_bytep)new_key, key_len + 1); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1156 | if (text_len) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1157 | png_write_chunk_data(png_ptr, (png_bytep)text, text_len); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1158 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1159 | png_write_chunk_end(png_ptr); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1160 | png_free(png_ptr, new_key); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1161 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1162 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1163 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1164 | #if defined(PNG_WRITE_zTXt_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1165 | /* write a compressed text chunk */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1166 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1167 | 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] | 1168 | png_size_t text_len, int compression) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1169 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1170 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1171 | PNG_zTXt; |
| 1172 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1173 | png_size_t key_len; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1174 | char buf[1]; |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1175 | png_charp new_key; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 1176 | compression_state comp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1177 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1178 | png_debug(1, "in png_write_zTXt\n"); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1179 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1180 | 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] | 1181 | { |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1182 | png_warning(png_ptr, "Empty keyword in zTXt chunk"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1183 | return; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1184 | } |
| 1185 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1186 | if (text == NULL || *text == '\0' || compression==PNG_TEXT_COMPRESSION_NONE) |
| 1187 | { |
| 1188 | png_write_tEXt(png_ptr, new_key, text, (png_size_t)0); |
| 1189 | png_free(png_ptr, new_key); |
| 1190 | return; |
| 1191 | } |
| 1192 | |
| 1193 | png_free(png_ptr, new_key); |
| 1194 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 1195 | /* compute the compressed data; do it now for the length */ |
| 1196 | text_len = png_text_compress(png_ptr, text, text_len, compression, &comp); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1197 | |
| 1198 | /* write start of chunk */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 1199 | png_write_chunk_start(png_ptr, (png_bytep)png_zTXt, (png_uint_32) |
| 1200 | (key_len+text_len+2)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1201 | /* write key */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1202 | png_write_chunk_data(png_ptr, (png_bytep)key, key_len + 1); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1203 | buf[0] = (png_byte)compression; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1204 | /* write compression */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1205 | 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^] | 1206 | /* write the compressed data */ |
| 1207 | png_write_compressed_data_out(png_ptr, &comp); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1208 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1209 | /* close the chunk */ |
| 1210 | png_write_chunk_end(png_ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1211 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1212 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1213 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 1214 | #if defined(PNG_WRITE_iTXt_SUPPORTED) |
| 1215 | /* write an iTXt chunk */ |
| 1216 | void |
| 1217 | png_write_iTXt(png_structp png_ptr, int compression, png_charp key, |
| 1218 | png_charp lang, png_charp translated_key, png_charp text) |
| 1219 | { |
| 1220 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1221 | PNG_iTXt; |
| 1222 | #endif |
| 1223 | png_size_t lang_len, key_len, translated_key_len, text_len; |
| 1224 | png_charp new_lang, new_key; |
| 1225 | png_byte cbuf[2]; |
| 1226 | compression_state comp; |
| 1227 | |
| 1228 | png_debug(1, "in png_write_iTXt\n"); |
| 1229 | |
| 1230 | translated_key_len = png_strlen(translated_key); |
| 1231 | text_len = png_strlen(text); |
| 1232 | |
| 1233 | if (lang == NULL || (lang_len = png_check_keyword(png_ptr, lang, |
| 1234 | &new_lang))==0) |
| 1235 | { |
| 1236 | png_warning(png_ptr, "Empty language field in iTXt chunk"); |
| 1237 | return; |
| 1238 | } |
| 1239 | if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0) |
| 1240 | { |
| 1241 | png_warning(png_ptr, "Empty keyword in iTXt chunk"); |
| 1242 | return; |
| 1243 | } |
| 1244 | |
| 1245 | if (text == NULL || *text == '\0') |
| 1246 | text_len = 0; |
| 1247 | |
| 1248 | /* compute the compressed data; do it now for the length */ |
| 1249 | text_len = png_text_compress(png_ptr, text, text_len, compression, &comp); |
| 1250 | |
| 1251 | /* make sure we include the compression flag, the compression byte, |
| 1252 | * and the NULs after the key, lang, and translated_key parts */ |
| 1253 | png_write_chunk_start(png_ptr, (png_bytep)png_iTXt, |
| 1254 | (png_uint_32)(2 + lang_len+1 + key_len+1 + translated_key_len + |
| 1255 | text_len)); |
| 1256 | |
| 1257 | /* set the compression bits */ |
| 1258 | if (compression == PNG_TEXT_COMPRESSION_NONE) |
| 1259 | { |
| 1260 | cbuf[0] = 0; |
| 1261 | cbuf[1] = 0; |
| 1262 | } |
| 1263 | else /* compression == PNG_TEXT_COMPRESSION_zTXt */ |
| 1264 | { |
| 1265 | cbuf[0] = 1; |
| 1266 | cbuf[1] = 0; |
| 1267 | } |
| 1268 | png_write_chunk_data(png_ptr, cbuf, 2); |
| 1269 | |
| 1270 | /* |
| 1271 | * We leave it to the application to meet PNG-1.0 requirements on the |
| 1272 | * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of |
| 1273 | * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them. |
| 1274 | * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG. |
| 1275 | */ |
| 1276 | png_write_chunk_data(png_ptr, (png_bytep)new_key, key_len + 1); |
| 1277 | png_write_chunk_data(png_ptr, (png_bytep)new_lang, lang_len + 1); |
| 1278 | png_write_chunk_data(png_ptr, (png_bytep)translated_key, |
| 1279 | translated_key_len); |
| 1280 | png_write_chunk_data(png_ptr, '\0', 1); |
| 1281 | |
| 1282 | png_write_compressed_data_out(png_ptr, &comp); |
| 1283 | |
| 1284 | png_write_chunk_end(png_ptr); |
| 1285 | png_free(png_ptr, new_key); |
| 1286 | png_free(png_ptr, new_lang); |
| 1287 | } |
| 1288 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1289 | |
| 1290 | #if defined(PNG_WRITE_oFFs_SUPPORTED) |
| 1291 | /* write the oFFs chunk */ |
| 1292 | void |
| 1293 | png_write_oFFs(png_structp png_ptr, png_uint_32 x_offset, |
| 1294 | png_uint_32 y_offset, |
| 1295 | int unit_type) |
| 1296 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1297 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1298 | PNG_oFFs; |
| 1299 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1300 | png_byte buf[9]; |
| 1301 | |
| 1302 | png_debug(1, "in png_write_oFFs\n"); |
| 1303 | if (unit_type >= PNG_OFFSET_LAST) |
| 1304 | png_warning(png_ptr, "Unrecognized unit type for oFFs chunk"); |
| 1305 | |
| 1306 | png_save_uint_32(buf, x_offset); |
| 1307 | png_save_uint_32(buf + 4, y_offset); |
| 1308 | buf[8] = (png_byte)unit_type; |
| 1309 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1310 | 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] | 1311 | } |
| 1312 | #endif |
| 1313 | |
| 1314 | #if defined(PNG_WRITE_pCAL_SUPPORTED) |
| 1315 | /* write the pCAL chunk (png-scivis-19970203) */ |
| 1316 | void |
| 1317 | png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0, |
| 1318 | png_int_32 X1, int type, int nparams, png_charp units, png_charpp params) |
| 1319 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1320 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1321 | PNG_pCAL; |
| 1322 | #endif |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1323 | png_size_t purpose_len, units_len, total_len; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1324 | png_uint_32p params_len; |
| 1325 | png_byte buf[10]; |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1326 | png_charp new_purpose; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1327 | int i; |
| 1328 | |
| 1329 | png_debug1(1, "in png_write_pCAL (%d parameters)\n", nparams); |
| 1330 | if (type >= PNG_EQUATION_LAST) |
| 1331 | png_warning(png_ptr, "Unrecognized equation type for pCAL chunk"); |
| 1332 | |
| 1333 | purpose_len = png_check_keyword(png_ptr, purpose, &new_purpose) + 1; |
| 1334 | png_debug1(3, "pCAL purpose length = %d\n", purpose_len); |
| 1335 | units_len = png_strlen(units) + (nparams == 0 ? 0 : 1); |
| 1336 | png_debug1(3, "pCAL units length = %d\n", units_len); |
| 1337 | total_len = purpose_len + units_len + 10; |
| 1338 | |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1339 | params_len = (png_uint_32p)png_malloc(png_ptr, (png_uint_32)(nparams |
| 1340 | *sizeof(png_uint_32))); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1341 | |
| 1342 | /* Find the length of each parameter, making sure we don't count the |
| 1343 | null terminator for the last parameter. */ |
| 1344 | for (i = 0; i < nparams; i++) |
| 1345 | { |
| 1346 | params_len[i] = png_strlen(params[i]) + (i == nparams - 1 ? 0 : 1); |
| 1347 | png_debug2(3, "pCAL parameter %d length = %d\n", i, params_len[i]); |
| 1348 | total_len += (png_size_t)params_len[i]; |
| 1349 | } |
| 1350 | |
| 1351 | png_debug1(3, "pCAL total length = %d\n", total_len); |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1352 | png_write_chunk_start(png_ptr, (png_bytep)png_pCAL, (png_uint_32)total_len); |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1353 | png_write_chunk_data(png_ptr, (png_bytep)new_purpose, purpose_len); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1354 | png_save_int_32(buf, X0); |
| 1355 | png_save_int_32(buf + 4, X1); |
| 1356 | buf[8] = (png_byte)type; |
| 1357 | buf[9] = (png_byte)nparams; |
| 1358 | png_write_chunk_data(png_ptr, buf, (png_size_t)10); |
| 1359 | png_write_chunk_data(png_ptr, (png_bytep)units, (png_size_t)units_len); |
| 1360 | |
| 1361 | png_free(png_ptr, new_purpose); |
| 1362 | |
| 1363 | for (i = 0; i < nparams; i++) |
| 1364 | { |
| 1365 | png_write_chunk_data(png_ptr, (png_bytep)params[i], |
| 1366 | (png_size_t)params_len[i]); |
| 1367 | } |
| 1368 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1369 | png_free(png_ptr, params_len); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1370 | png_write_chunk_end(png_ptr); |
| 1371 | } |
| 1372 | #endif |
| 1373 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 1374 | #if defined(PNG_WRITE_sCAL_SUPPORTED) |
| 1375 | /* write the sCAL chunk */ |
| 1376 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1377 | void |
| 1378 | png_write_sCAL(png_structp png_ptr, png_charp unit, double width,double height) |
| 1379 | { |
| 1380 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1381 | PNG_sCAL; |
| 1382 | #endif |
| 1383 | png_size_t total_len; |
| 1384 | char wbuf[32], hbuf[32]; |
| 1385 | |
| 1386 | png_debug(1, "in png_write_sCAL\n"); |
| 1387 | |
| 1388 | sprintf(wbuf, "%12.12e", width); |
| 1389 | sprintf(hbuf, "%12.12e", height); |
| 1390 | total_len = png_strlen(unit)+1 + png_strlen(wbuf)+1 + png_strlen(hbuf); |
| 1391 | |
| 1392 | png_debug1(3, "sCAL total length = %d\n", total_len); |
| 1393 | png_write_chunk_start(png_ptr, (png_bytep)png_sCAL, (png_uint_32)total_len); |
| 1394 | png_write_chunk_data(png_ptr, (png_bytep)unit, png_strlen(unit)+1); |
| 1395 | png_write_chunk_data(png_ptr, (png_bytep)wbuf, strlen(wbuf)+1); |
| 1396 | png_write_chunk_data(png_ptr, (png_bytep)hbuf, strlen(hbuf)); |
| 1397 | |
| 1398 | png_write_chunk_end(png_ptr); |
| 1399 | } |
| 1400 | #endif |
| 1401 | void |
| 1402 | png_write_sCAL_s(png_structp png_ptr, png_charp unit, png_charp width, |
| 1403 | png_charp height) |
| 1404 | { |
| 1405 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1406 | PNG_sCAL; |
| 1407 | #endif |
| 1408 | png_size_t total_len; |
| 1409 | char wbuf[32], hbuf[32]; |
| 1410 | |
| 1411 | png_debug(1, "in png_write_sCAL\n"); |
| 1412 | |
| 1413 | sprintf(wbuf, "%s", width); |
| 1414 | sprintf(hbuf, "%s", height); |
| 1415 | total_len = png_strlen(unit)+1 + png_strlen(wbuf)+1 + png_strlen(hbuf); |
| 1416 | |
| 1417 | png_debug1(3, "sCAL total length = %d\n", total_len); |
| 1418 | png_write_chunk_start(png_ptr, (png_bytep)png_sCAL, (png_uint_32)total_len); |
| 1419 | png_write_chunk_data(png_ptr, (png_bytep)unit, png_strlen(unit)+1); |
| 1420 | png_write_chunk_data(png_ptr, (png_bytep)wbuf, strlen(wbuf)+1); |
| 1421 | png_write_chunk_data(png_ptr, (png_bytep)hbuf, strlen(hbuf)); |
| 1422 | |
| 1423 | png_write_chunk_end(png_ptr); |
| 1424 | } |
| 1425 | #endif |
| 1426 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1427 | #if defined(PNG_WRITE_pHYs_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1428 | /* write the pHYs chunk */ |
| 1429 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1430 | 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] | 1431 | png_uint_32 y_pixels_per_unit, |
| 1432 | int unit_type) |
| 1433 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1434 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1435 | PNG_pHYs; |
| 1436 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1437 | png_byte buf[9]; |
| 1438 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1439 | png_debug(1, "in png_write_pHYs\n"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1440 | if (unit_type >= PNG_RESOLUTION_LAST) |
| 1441 | png_warning(png_ptr, "Unrecognized unit type for pHYs chunk"); |
| 1442 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1443 | png_save_uint_32(buf, x_pixels_per_unit); |
| 1444 | png_save_uint_32(buf + 4, y_pixels_per_unit); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1445 | buf[8] = (png_byte)unit_type; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1446 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1447 | 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] | 1448 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1449 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1450 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1451 | #if defined(PNG_WRITE_tIME_SUPPORTED) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1452 | /* Write the tIME chunk. Use either png_convert_from_struct_tm() |
| 1453 | * or png_convert_from_time_t(), or fill in the structure yourself. |
| 1454 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1455 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1456 | png_write_tIME(png_structp png_ptr, png_timep mod_time) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1457 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1458 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1459 | PNG_tIME; |
| 1460 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1461 | png_byte buf[7]; |
| 1462 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1463 | png_debug(1, "in png_write_tIME\n"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1464 | if (mod_time->month > 12 || mod_time->month < 1 || |
| 1465 | mod_time->day > 31 || mod_time->day < 1 || |
| 1466 | mod_time->hour > 23 || mod_time->second > 60) |
| 1467 | { |
| 1468 | png_warning(png_ptr, "Invalid time specified for tIME chunk"); |
| 1469 | return; |
| 1470 | } |
| 1471 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1472 | png_save_uint_16(buf, mod_time->year); |
| 1473 | buf[2] = mod_time->month; |
| 1474 | buf[3] = mod_time->day; |
| 1475 | buf[4] = mod_time->hour; |
| 1476 | buf[5] = mod_time->minute; |
| 1477 | buf[6] = mod_time->second; |
| 1478 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1479 | 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] | 1480 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1481 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1482 | |
| 1483 | /* initializes the row writing capability of libpng */ |
| 1484 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1485 | png_write_start_row(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1486 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1487 | #ifdef PNG_USE_LOCAL_ARRAYS |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1488 | /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 1489 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1490 | /* start of interlace block */ |
| 1491 | 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^] | 1492 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1493 | /* offset to next interlace block */ |
| 1494 | 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^] | 1495 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1496 | /* start of interlace block in the y direction */ |
| 1497 | 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^] | 1498 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1499 | /* offset to next interlace block in the y direction */ |
| 1500 | 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] | 1501 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 1502 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1503 | png_size_t buf_size; |
| 1504 | |
| 1505 | png_debug(1, "in png_write_start_row\n"); |
| 1506 | buf_size = (png_size_t)(((png_ptr->width * png_ptr->usr_channels * |
| 1507 | png_ptr->usr_bit_depth + 7) >> 3) + 1); |
| 1508 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1509 | /* set up row buffer */ |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1510 | png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, (png_uint_32)buf_size); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1511 | png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1512 | |
| 1513 | /* set up filtering buffer, if using this filter */ |
| 1514 | if (png_ptr->do_filter & PNG_FILTER_SUB) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1515 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1516 | png_ptr->sub_row = (png_bytep)png_malloc(png_ptr, |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1517 | (png_ptr->rowbytes + 1)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1518 | png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1519 | } |
| 1520 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1521 | /* 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] | 1522 | if (png_ptr->do_filter & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH)) |
| 1523 | { |
| 1524 | /* set up previous row buffer */ |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1525 | png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)buf_size); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1526 | png_memset(png_ptr->prev_row, 0, buf_size); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1527 | |
| 1528 | if (png_ptr->do_filter & PNG_FILTER_UP) |
| 1529 | { |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1530 | png_ptr->up_row = (png_bytep )png_malloc(png_ptr, |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1531 | (png_ptr->rowbytes + 1)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1532 | png_ptr->up_row[0] = PNG_FILTER_VALUE_UP; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1533 | } |
| 1534 | |
| 1535 | if (png_ptr->do_filter & PNG_FILTER_AVG) |
| 1536 | { |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1537 | png_ptr->avg_row = (png_bytep)png_malloc(png_ptr, |
| 1538 | (png_ptr->rowbytes + 1)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1539 | png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1540 | } |
| 1541 | |
| 1542 | if (png_ptr->do_filter & PNG_FILTER_PAETH) |
| 1543 | { |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1544 | png_ptr->paeth_row = (png_bytep )png_malloc(png_ptr, |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1545 | (png_ptr->rowbytes + 1)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1546 | png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1547 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1548 | } |
| 1549 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1550 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1551 | /* if interlaced, we need to set up width and height of pass */ |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1552 | if (png_ptr->interlaced) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1553 | { |
| 1554 | if (!(png_ptr->transformations & PNG_INTERLACE)) |
| 1555 | { |
| 1556 | png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 - |
| 1557 | png_pass_ystart[0]) / png_pass_yinc[0]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1558 | png_ptr->usr_width = (png_ptr->width + png_pass_inc[0] - 1 - |
| 1559 | png_pass_start[0]) / png_pass_inc[0]; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1560 | } |
| 1561 | else |
| 1562 | { |
| 1563 | png_ptr->num_rows = png_ptr->height; |
| 1564 | png_ptr->usr_width = png_ptr->width; |
| 1565 | } |
| 1566 | } |
| 1567 | else |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1568 | #endif |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1569 | { |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1570 | png_ptr->num_rows = png_ptr->height; |
| 1571 | png_ptr->usr_width = png_ptr->width; |
| 1572 | } |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1573 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 1574 | png_ptr->zstream.next_out = png_ptr->zbuf; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1575 | } |
| 1576 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1577 | /* Internal use only. Called when finished processing a row of data. */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1578 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1579 | png_write_finish_row(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1580 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1581 | #ifdef PNG_USE_LOCAL_ARRAYS |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1582 | /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 1583 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1584 | /* start of interlace block */ |
| 1585 | 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^] | 1586 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1587 | /* offset to next interlace block */ |
| 1588 | 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^] | 1589 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1590 | /* start of interlace block in the y direction */ |
| 1591 | 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^] | 1592 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1593 | /* offset to next interlace block in the y direction */ |
| 1594 | 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] | 1595 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 1596 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1597 | int ret; |
| 1598 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1599 | png_debug(1, "in png_write_finish_row\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1600 | /* next row */ |
| 1601 | png_ptr->row_number++; |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 1602 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1603 | /* see if we are done */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1604 | if (png_ptr->row_number < png_ptr->num_rows) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1605 | return; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1606 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1607 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1608 | /* if interlaced, go to next pass */ |
| 1609 | if (png_ptr->interlaced) |
| 1610 | { |
| 1611 | png_ptr->row_number = 0; |
| 1612 | if (png_ptr->transformations & PNG_INTERLACE) |
| 1613 | { |
| 1614 | png_ptr->pass++; |
| 1615 | } |
| 1616 | else |
| 1617 | { |
| 1618 | /* loop until we find a non-zero width or height pass */ |
| 1619 | do |
| 1620 | { |
| 1621 | png_ptr->pass++; |
| 1622 | if (png_ptr->pass >= 7) |
| 1623 | break; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1624 | png_ptr->usr_width = (png_ptr->width + |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1625 | png_pass_inc[png_ptr->pass] - 1 - |
| 1626 | png_pass_start[png_ptr->pass]) / |
| 1627 | png_pass_inc[png_ptr->pass]; |
| 1628 | png_ptr->num_rows = (png_ptr->height + |
| 1629 | png_pass_yinc[png_ptr->pass] - 1 - |
| 1630 | png_pass_ystart[png_ptr->pass]) / |
| 1631 | png_pass_yinc[png_ptr->pass]; |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1632 | if (png_ptr->transformations & PNG_INTERLACE) |
| 1633 | break; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1634 | } while (png_ptr->usr_width == 0 || png_ptr->num_rows == 0); |
| 1635 | |
| 1636 | } |
| 1637 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1638 | /* reset the row above the image for the next pass */ |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1639 | if (png_ptr->pass < 7) |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 1640 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1641 | if (png_ptr->prev_row != NULL) |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1642 | png_memset(png_ptr->prev_row, 0, |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1643 | (png_size_t) (((png_uint_32)png_ptr->usr_channels * |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 1644 | (png_uint_32)png_ptr->usr_bit_depth * |
| 1645 | png_ptr->width + 7) >> 3) + 1); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1646 | return; |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 1647 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1648 | } |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1649 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1650 | |
| 1651 | /* if we get here, we've just written the last row, so we need |
| 1652 | to flush the compressor */ |
| 1653 | do |
| 1654 | { |
| 1655 | /* tell the compressor we are done */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1656 | ret = deflate(&png_ptr->zstream, Z_FINISH); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1657 | /* check for an error */ |
| 1658 | if (ret != Z_OK && ret != Z_STREAM_END) |
| 1659 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1660 | if (png_ptr->zstream.msg != NULL) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1661 | png_error(png_ptr, png_ptr->zstream.msg); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1662 | else |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1663 | png_error(png_ptr, "zlib error"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1664 | } |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1665 | /* check to see if we need more room */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1666 | if (!(png_ptr->zstream.avail_out) && ret == Z_OK) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1667 | { |
| 1668 | png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1669 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 1670 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1671 | } |
| 1672 | } while (ret != Z_STREAM_END); |
| 1673 | |
| 1674 | /* write any extra space */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1675 | if (png_ptr->zstream.avail_out < png_ptr->zbuf_size) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1676 | { |
| 1677 | png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size - |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1678 | png_ptr->zstream.avail_out); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1679 | } |
| 1680 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1681 | deflateReset(&png_ptr->zstream); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1682 | } |
| 1683 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1684 | #if defined(PNG_WRITE_INTERLACING_SUPPORTED) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1685 | /* Pick out the correct pixels for the interlace pass. |
| 1686 | * The basic idea here is to go through the row with a source |
| 1687 | * pointer and a destination pointer (sp and dp), and copy the |
| 1688 | * correct pixels for the pass. As the row gets compacted, |
| 1689 | * sp will always be >= dp, so we should never overwrite anything. |
| 1690 | * See the default: case for the easiest code to understand. |
| 1691 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1692 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1693 | 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] | 1694 | { |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1695 | #ifdef PNG_USE_LOCAL_ARRAYS |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1696 | /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 1697 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1698 | /* start of interlace block */ |
| 1699 | 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^] | 1700 | |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1701 | /* offset to next interlace block */ |
| 1702 | 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] | 1703 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 1704 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1705 | png_debug(1, "in png_do_write_interlace\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1706 | /* we don't have to do anything on the last pass (6) */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1707 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
| 1708 | if (row != NULL && row_info != NULL && pass < 6) |
| 1709 | #else |
| 1710 | if (pass < 6) |
| 1711 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1712 | { |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 1713 | /* each pixel depth is handled separately */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1714 | switch (row_info->pixel_depth) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1715 | { |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1716 | case 1: |
| 1717 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1718 | png_bytep sp; |
| 1719 | png_bytep dp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1720 | int shift; |
| 1721 | int d; |
| 1722 | int value; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1723 | png_uint_32 i; |
| 1724 | png_uint_32 row_width = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1725 | |
| 1726 | dp = row; |
| 1727 | d = 0; |
| 1728 | shift = 7; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1729 | for (i = png_pass_start[pass]; i < row_width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1730 | i += png_pass_inc[pass]) |
| 1731 | { |
| 1732 | sp = row + (png_size_t)(i >> 3); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1733 | value = (int)(*sp >> (7 - (int)(i & 7))) & 0x1; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1734 | d |= (value << shift); |
| 1735 | |
| 1736 | if (shift == 0) |
| 1737 | { |
| 1738 | shift = 7; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1739 | *dp++ = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1740 | d = 0; |
| 1741 | } |
| 1742 | else |
| 1743 | shift--; |
| 1744 | |
| 1745 | } |
| 1746 | if (shift != 7) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1747 | *dp = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1748 | break; |
| 1749 | } |
| 1750 | case 2: |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1751 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1752 | png_bytep sp; |
| 1753 | png_bytep dp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1754 | int shift; |
| 1755 | int d; |
| 1756 | int value; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1757 | png_uint_32 i; |
| 1758 | png_uint_32 row_width = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1759 | |
| 1760 | dp = row; |
| 1761 | shift = 6; |
| 1762 | d = 0; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1763 | for (i = png_pass_start[pass]; i < row_width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1764 | i += png_pass_inc[pass]) |
| 1765 | { |
| 1766 | sp = row + (png_size_t)(i >> 2); |
| 1767 | value = (*sp >> ((3 - (int)(i & 3)) << 1)) & 0x3; |
| 1768 | d |= (value << shift); |
| 1769 | |
| 1770 | if (shift == 0) |
| 1771 | { |
| 1772 | shift = 6; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1773 | *dp++ = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1774 | d = 0; |
| 1775 | } |
| 1776 | else |
| 1777 | shift -= 2; |
| 1778 | } |
| 1779 | if (shift != 6) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1780 | *dp = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1781 | break; |
| 1782 | } |
| 1783 | case 4: |
| 1784 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1785 | png_bytep sp; |
| 1786 | png_bytep dp; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1787 | int shift; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1788 | int d; |
| 1789 | int value; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1790 | png_uint_32 i; |
| 1791 | png_uint_32 row_width = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1792 | |
| 1793 | dp = row; |
| 1794 | shift = 4; |
| 1795 | d = 0; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1796 | for (i = png_pass_start[pass]; i < row_width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1797 | i += png_pass_inc[pass]) |
| 1798 | { |
| 1799 | sp = row + (png_size_t)(i >> 1); |
| 1800 | value = (*sp >> ((1 - (int)(i & 1)) << 2)) & 0xf; |
| 1801 | d |= (value << shift); |
| 1802 | |
| 1803 | if (shift == 0) |
| 1804 | { |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1805 | shift = 4; |
| 1806 | *dp++ = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1807 | d = 0; |
| 1808 | } |
| 1809 | else |
| 1810 | shift -= 4; |
| 1811 | } |
| 1812 | if (shift != 4) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1813 | *dp = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1814 | break; |
| 1815 | } |
| 1816 | default: |
| 1817 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1818 | png_bytep sp; |
| 1819 | png_bytep dp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1820 | png_uint_32 i; |
| 1821 | png_uint_32 row_width = row_info->width; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1822 | png_size_t pixel_bytes; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1823 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1824 | /* start at the beginning */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1825 | dp = row; |
| 1826 | /* find out how many bytes each pixel takes up */ |
| 1827 | pixel_bytes = (row_info->pixel_depth >> 3); |
| 1828 | /* loop through the row, only looking at the pixels that |
| 1829 | matter */ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1830 | for (i = png_pass_start[pass]; i < row_width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1831 | i += png_pass_inc[pass]) |
| 1832 | { |
| 1833 | /* find out where the original pixel is */ |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 1834 | sp = row + (png_size_t)i * pixel_bytes; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1835 | /* move the pixel */ |
| 1836 | if (dp != sp) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1837 | png_memcpy(dp, sp, pixel_bytes); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1838 | /* next pixel */ |
| 1839 | dp += pixel_bytes; |
| 1840 | } |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1841 | break; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1842 | } |
| 1843 | } |
| 1844 | /* set new row width */ |
| 1845 | row_info->width = (row_info->width + |
| 1846 | png_pass_inc[pass] - 1 - |
| 1847 | png_pass_start[pass]) / |
| 1848 | png_pass_inc[pass]; |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1849 | row_info->rowbytes = ((row_info->width * |
| 1850 | row_info->pixel_depth + 7) >> 3); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1851 | } |
| 1852 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1853 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1854 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1855 | /* This filters the row, chooses which filter to use, if it has not already |
| 1856 | * 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] | 1857 | * chosen filter. |
| 1858 | */ |
Glenn Randers-Pehrson | ea3bcd7 | 1998-03-07 14:33:00 -0600 | [diff] [blame] | 1859 | #define PNG_MAXSUM (~((png_uint_32)0) >> 1) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1860 | #define PNG_HISHIFT 10 |
Glenn Randers-Pehrson | ea3bcd7 | 1998-03-07 14:33:00 -0600 | [diff] [blame] | 1861 | #define PNG_LOMASK ((png_uint_32)0xffffL) |
| 1862 | #define PNG_HIMASK ((png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT)) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1863 | void |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1864 | 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] | 1865 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1866 | png_bytep prev_row, best_row, row_buf; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1867 | png_uint_32 mins, bpp; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 1868 | png_byte filter_to_do = png_ptr->do_filter; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1869 | png_uint_32 row_bytes = row_info->rowbytes; |
| 1870 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 1871 | int num_p_filters = (int)png_ptr->num_prev_filters; |
| 1872 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1873 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1874 | png_debug(1, "in png_write_find_filter\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1875 | /* find out how many bytes offset each pixel is */ |
| 1876 | bpp = (row_info->pixel_depth + 7) / 8; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1877 | |
| 1878 | prev_row = png_ptr->prev_row; |
| 1879 | best_row = row_buf = png_ptr->row_buf; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1880 | mins = PNG_MAXSUM; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1881 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1882 | /* The prediction method we use is to find which method provides the |
| 1883 | * smallest value when summing the absolute values of the distances |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 1884 | * from zero, using anything >= 128 as negative numbers. This is known |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1885 | * as the "minimum sum of absolute differences" heuristic. Other |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 1886 | * heuristics are the "weighted minimum sum of absolute differences" |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1887 | * (experimental and can in theory improve compression), and the "zlib |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1888 | * predictive" method (not implemented yet), which does test compressions |
| 1889 | * of lines using different filter methods, and then chooses the |
| 1890 | * (series of) filter(s) that give minimum compressed data size (VERY |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1891 | * computationally expensive). |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1892 | * |
| 1893 | * GRR 980525: consider also |
| 1894 | * (1) minimum sum of absolute differences from running average (i.e., |
| 1895 | * keep running sum of non-absolute differences & count of bytes) |
| 1896 | * [track dispersion, too? restart average if dispersion too large?] |
| 1897 | * (1b) minimum sum of absolute differences from sliding average, probably |
| 1898 | * with window size <= deflate window (usually 32K) |
| 1899 | * (2) minimum sum of squared differences from zero or running average |
| 1900 | * (i.e., ~ root-mean-square approach) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1901 | */ |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1902 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 1903 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1904 | /* 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] | 1905 | * that has been chosen, as it doesn't actually do anything to the data. |
| 1906 | */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 1907 | if (filter_to_do & PNG_FILTER_NONE && |
| 1908 | filter_to_do != PNG_FILTER_NONE) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1909 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1910 | png_bytep rp; |
| 1911 | png_uint_32 sum = 0; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1912 | png_uint_32 i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1913 | int v; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1914 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1915 | for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1916 | { |
| 1917 | v = *rp; |
| 1918 | sum += (v < 128) ? v : 256 - v; |
| 1919 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1920 | |
| 1921 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 1922 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 1923 | { |
| 1924 | png_uint_32 sumhi, sumlo; |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 1925 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1926 | sumlo = sum & PNG_LOMASK; |
| 1927 | sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; /* Gives us some footroom */ |
| 1928 | |
| 1929 | /* Reduce the sum if we match any of the previous rows */ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1930 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1931 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1932 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1933 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1934 | sumlo = (sumlo * png_ptr->filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1935 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1936 | sumhi = (sumhi * png_ptr->filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1937 | PNG_WEIGHT_SHIFT; |
| 1938 | } |
| 1939 | } |
| 1940 | |
| 1941 | /* Factor in the cost of this filter (this is here for completeness, |
| 1942 | * but it makes no sense to have a "cost" for the NONE filter, as |
| 1943 | * it has the minimum possible computational cost - none). |
| 1944 | */ |
| 1945 | sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >> |
| 1946 | PNG_COST_SHIFT; |
| 1947 | sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >> |
| 1948 | PNG_COST_SHIFT; |
| 1949 | |
| 1950 | if (sumhi > PNG_HIMASK) |
| 1951 | sum = PNG_MAXSUM; |
| 1952 | else |
| 1953 | sum = (sumhi << PNG_HISHIFT) + sumlo; |
| 1954 | } |
| 1955 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1956 | mins = sum; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1957 | } |
| 1958 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1959 | /* sub filter */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 1960 | if (filter_to_do == PNG_FILTER_SUB) |
| 1961 | /* it's the only filter so no testing is needed */ |
| 1962 | { |
| 1963 | png_bytep rp, lp, dp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1964 | png_uint_32 i; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 1965 | for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp; |
| 1966 | i++, rp++, dp++) |
| 1967 | { |
| 1968 | *dp = *rp; |
| 1969 | } |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1970 | for (lp = row_buf + 1; i < row_bytes; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 1971 | i++, rp++, lp++, dp++) |
| 1972 | { |
| 1973 | *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff); |
| 1974 | } |
| 1975 | best_row = png_ptr->sub_row; |
| 1976 | } |
| 1977 | |
| 1978 | else if (filter_to_do & PNG_FILTER_SUB) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1979 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1980 | png_bytep rp, dp, lp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1981 | png_uint_32 sum = 0, lmins = mins; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1982 | png_uint_32 i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1983 | int v; |
| 1984 | |
| 1985 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 1986 | /* We temporarily increase the "minimum sum" by the factor we |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1987 | * would reduce the sum of this filter, so that we can do the |
| 1988 | * early exit comparison without scaling the sum each time. |
| 1989 | */ |
| 1990 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 1991 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 1992 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1993 | png_uint_32 lmhi, lmlo; |
| 1994 | lmlo = lmins & PNG_LOMASK; |
| 1995 | lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; |
| 1996 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1997 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1998 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 1999 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2000 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2001 | lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2002 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2003 | lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2004 | PNG_WEIGHT_SHIFT; |
| 2005 | } |
| 2006 | } |
| 2007 | |
| 2008 | lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> |
| 2009 | PNG_COST_SHIFT; |
| 2010 | lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> |
| 2011 | PNG_COST_SHIFT; |
| 2012 | |
| 2013 | if (lmhi > PNG_HIMASK) |
| 2014 | lmins = PNG_MAXSUM; |
| 2015 | else |
| 2016 | lmins = (lmhi << PNG_HISHIFT) + lmlo; |
| 2017 | } |
| 2018 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2019 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2020 | for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp; |
| 2021 | i++, rp++, dp++) |
| 2022 | { |
| 2023 | v = *dp = *rp; |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2024 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2025 | sum += (v < 128) ? v : 256 - v; |
| 2026 | } |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 2027 | for (lp = row_buf + 1; i < row_info->rowbytes; |
| 2028 | i++, rp++, lp++, dp++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2029 | { |
| 2030 | v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2031 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2032 | sum += (v < 128) ? v : 256 - v; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2033 | |
| 2034 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2035 | break; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2036 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2037 | |
| 2038 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2039 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2040 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2041 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2042 | png_uint_32 sumhi, sumlo; |
| 2043 | sumlo = sum & PNG_LOMASK; |
| 2044 | sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; |
| 2045 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2046 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2047 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2048 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2049 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2050 | sumlo = (sumlo * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2051 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2052 | sumhi = (sumhi * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2053 | PNG_WEIGHT_SHIFT; |
| 2054 | } |
| 2055 | } |
| 2056 | |
| 2057 | sumlo = (sumlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> |
| 2058 | PNG_COST_SHIFT; |
| 2059 | sumhi = (sumhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> |
| 2060 | PNG_COST_SHIFT; |
| 2061 | |
| 2062 | if (sumhi > PNG_HIMASK) |
| 2063 | sum = PNG_MAXSUM; |
| 2064 | else |
| 2065 | sum = (sumhi << PNG_HISHIFT) + sumlo; |
| 2066 | } |
| 2067 | #endif |
| 2068 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2069 | if (sum < mins) |
| 2070 | { |
| 2071 | mins = sum; |
| 2072 | best_row = png_ptr->sub_row; |
| 2073 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2074 | } |
| 2075 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2076 | /* up filter */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2077 | if (filter_to_do == PNG_FILTER_UP) |
| 2078 | { |
| 2079 | png_bytep rp, dp, pp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2080 | png_uint_32 i; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2081 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2082 | 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] | 2083 | pp = prev_row + 1; i < row_bytes; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2084 | i++, rp++, pp++, dp++) |
| 2085 | { |
| 2086 | *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff); |
| 2087 | } |
| 2088 | best_row = png_ptr->up_row; |
| 2089 | } |
| 2090 | |
| 2091 | else if (filter_to_do & PNG_FILTER_UP) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2092 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2093 | png_bytep rp, dp, pp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2094 | png_uint_32 sum = 0, lmins = mins; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2095 | png_uint_32 i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2096 | int v; |
| 2097 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2098 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2099 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2100 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2101 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2102 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2103 | png_uint_32 lmhi, lmlo; |
| 2104 | lmlo = lmins & PNG_LOMASK; |
| 2105 | lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; |
| 2106 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2107 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2108 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2109 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2110 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2111 | lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2112 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2113 | lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2114 | PNG_WEIGHT_SHIFT; |
| 2115 | } |
| 2116 | } |
| 2117 | |
| 2118 | lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >> |
| 2119 | PNG_COST_SHIFT; |
| 2120 | lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >> |
| 2121 | PNG_COST_SHIFT; |
| 2122 | |
| 2123 | if (lmhi > PNG_HIMASK) |
| 2124 | lmins = PNG_MAXSUM; |
| 2125 | else |
| 2126 | lmins = (lmhi << PNG_HISHIFT) + lmlo; |
| 2127 | } |
| 2128 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2129 | |
| 2130 | 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] | 2131 | pp = prev_row + 1; i < row_bytes; i++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2132 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2133 | v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2134 | |
| 2135 | sum += (v < 128) ? v : 256 - v; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2136 | |
| 2137 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2138 | break; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2139 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2140 | |
| 2141 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2142 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2143 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2144 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2145 | png_uint_32 sumhi, sumlo; |
| 2146 | sumlo = sum & PNG_LOMASK; |
| 2147 | sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; |
| 2148 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2149 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2150 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2151 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2152 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2153 | sumlo = (sumlo * png_ptr->filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2154 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2155 | sumhi = (sumhi * png_ptr->filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2156 | PNG_WEIGHT_SHIFT; |
| 2157 | } |
| 2158 | } |
| 2159 | |
| 2160 | sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >> |
| 2161 | PNG_COST_SHIFT; |
| 2162 | sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >> |
| 2163 | PNG_COST_SHIFT; |
| 2164 | |
| 2165 | if (sumhi > PNG_HIMASK) |
| 2166 | sum = PNG_MAXSUM; |
| 2167 | else |
| 2168 | sum = (sumhi << PNG_HISHIFT) + sumlo; |
| 2169 | } |
| 2170 | #endif |
| 2171 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2172 | if (sum < mins) |
| 2173 | { |
| 2174 | mins = sum; |
| 2175 | best_row = png_ptr->up_row; |
| 2176 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2177 | } |
| 2178 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2179 | /* avg filter */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2180 | if (filter_to_do == PNG_FILTER_AVG) |
| 2181 | { |
| 2182 | png_bytep rp, dp, pp, lp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2183 | png_uint_32 i; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2184 | 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] | 2185 | pp = prev_row + 1; i < bpp; i++) |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2186 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2187 | *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2188 | } |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2189 | for (lp = row_buf + 1; i < row_bytes; i++) |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2190 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2191 | *dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) |
| 2192 | & 0xff); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2193 | } |
| 2194 | best_row = png_ptr->avg_row; |
| 2195 | } |
| 2196 | |
| 2197 | else if (filter_to_do & PNG_FILTER_AVG) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2198 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2199 | png_bytep rp, dp, pp, lp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2200 | png_uint_32 sum = 0, lmins = mins; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2201 | png_uint_32 i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2202 | int v; |
| 2203 | |
| 2204 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2205 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2206 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2207 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2208 | png_uint_32 lmhi, lmlo; |
| 2209 | lmlo = lmins & PNG_LOMASK; |
| 2210 | lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; |
| 2211 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2212 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2213 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2214 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_AVG) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2215 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2216 | lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2217 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2218 | lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2219 | PNG_WEIGHT_SHIFT; |
| 2220 | } |
| 2221 | } |
| 2222 | |
| 2223 | lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >> |
| 2224 | PNG_COST_SHIFT; |
| 2225 | lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >> |
| 2226 | PNG_COST_SHIFT; |
| 2227 | |
| 2228 | if (lmhi > PNG_HIMASK) |
| 2229 | lmins = PNG_MAXSUM; |
| 2230 | else |
| 2231 | lmins = (lmhi << PNG_HISHIFT) + lmlo; |
| 2232 | } |
| 2233 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2234 | |
| 2235 | 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] | 2236 | pp = prev_row + 1; i < bpp; i++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2237 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2238 | v = *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2239 | |
| 2240 | sum += (v < 128) ? v : 256 - v; |
| 2241 | } |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2242 | for (lp = row_buf + 1; i < row_bytes; i++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2243 | { |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2244 | v = *dp++ = |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2245 | (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) & 0xff); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2246 | |
| 2247 | sum += (v < 128) ? v : 256 - v; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2248 | |
| 2249 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2250 | break; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2251 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2252 | |
| 2253 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 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 sumhi, sumlo; |
| 2258 | sumlo = sum & PNG_LOMASK; |
| 2259 | sumhi = (sum >> 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_NONE) |
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 | sumlo = (sumlo * png_ptr->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 | sumhi = (sumhi * png_ptr->filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2268 | PNG_WEIGHT_SHIFT; |
| 2269 | } |
| 2270 | } |
| 2271 | |
| 2272 | sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >> |
| 2273 | PNG_COST_SHIFT; |
| 2274 | sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >> |
| 2275 | PNG_COST_SHIFT; |
| 2276 | |
| 2277 | if (sumhi > PNG_HIMASK) |
| 2278 | sum = PNG_MAXSUM; |
| 2279 | else |
| 2280 | sum = (sumhi << PNG_HISHIFT) + sumlo; |
| 2281 | } |
| 2282 | #endif |
| 2283 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2284 | if (sum < mins) |
| 2285 | { |
| 2286 | mins = sum; |
| 2287 | best_row = png_ptr->avg_row; |
| 2288 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2289 | } |
| 2290 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2291 | /* Paeth filter */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2292 | if (filter_to_do == PNG_FILTER_PAETH) |
| 2293 | { |
| 2294 | png_bytep rp, dp, pp, cp, lp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2295 | png_uint_32 i; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2296 | 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] | 2297 | pp = prev_row + 1; i < bpp; i++) |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2298 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2299 | *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2300 | } |
| 2301 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2302 | 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] | 2303 | { |
| 2304 | int a, b, c, pa, pb, pc, p; |
| 2305 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2306 | b = *pp++; |
| 2307 | c = *cp++; |
| 2308 | a = *lp++; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2309 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2310 | p = b - c; |
| 2311 | pc = a - c; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2312 | |
| 2313 | #ifdef PNG_USE_ABS |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2314 | pa = abs(p); |
| 2315 | pb = abs(pc); |
| 2316 | pc = abs(p + pc); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2317 | #else |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2318 | pa = p < 0 ? -p : p; |
| 2319 | pb = pc < 0 ? -pc : pc; |
| 2320 | pc = (p + pc) < 0 ? -(p + pc) : p + pc; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2321 | #endif |
| 2322 | |
| 2323 | p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c; |
| 2324 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2325 | *dp++ = (png_byte)(((int)*rp++ - p) & 0xff); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2326 | } |
| 2327 | best_row = png_ptr->paeth_row; |
| 2328 | } |
| 2329 | |
| 2330 | else if (filter_to_do & PNG_FILTER_PAETH) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2331 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2332 | png_bytep rp, dp, pp, cp, lp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2333 | png_uint_32 sum = 0, lmins = mins; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2334 | png_uint_32 i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2335 | int v; |
| 2336 | |
| 2337 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2338 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2339 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2340 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2341 | png_uint_32 lmhi, lmlo; |
| 2342 | lmlo = lmins & PNG_LOMASK; |
| 2343 | lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; |
| 2344 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2345 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2346 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2347 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2348 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2349 | lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2350 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2351 | lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2352 | PNG_WEIGHT_SHIFT; |
| 2353 | } |
| 2354 | } |
| 2355 | |
| 2356 | lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >> |
| 2357 | PNG_COST_SHIFT; |
| 2358 | lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >> |
| 2359 | PNG_COST_SHIFT; |
| 2360 | |
| 2361 | if (lmhi > PNG_HIMASK) |
| 2362 | lmins = PNG_MAXSUM; |
| 2363 | else |
| 2364 | lmins = (lmhi << PNG_HISHIFT) + lmlo; |
| 2365 | } |
| 2366 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2367 | |
| 2368 | 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] | 2369 | pp = prev_row + 1; i < bpp; i++) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2370 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2371 | v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2372 | |
| 2373 | sum += (v < 128) ? v : 256 - v; |
| 2374 | } |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2375 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2376 | 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] | 2377 | { |
| 2378 | int a, b, c, pa, pb, pc, p; |
| 2379 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2380 | b = *pp++; |
| 2381 | c = *cp++; |
| 2382 | a = *lp++; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2383 | |
| 2384 | #ifndef PNG_SLOW_PAETH |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2385 | p = b - c; |
| 2386 | pc = a - c; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2387 | #ifdef PNG_USE_ABS |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2388 | pa = abs(p); |
| 2389 | pb = abs(pc); |
| 2390 | pc = abs(p + pc); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2391 | #else |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2392 | pa = p < 0 ? -p : p; |
| 2393 | pb = pc < 0 ? -pc : pc; |
| 2394 | pc = (p + pc) < 0 ? -(p + pc) : p + pc; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2395 | #endif |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2396 | p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c; |
| 2397 | #else /* PNG_SLOW_PAETH */ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2398 | p = a + b - c; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2399 | pa = abs(p - a); |
| 2400 | pb = abs(p - b); |
| 2401 | pc = abs(p - c); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2402 | if (pa <= pb && pa <= pc) |
| 2403 | p = a; |
| 2404 | else if (pb <= pc) |
| 2405 | p = b; |
| 2406 | else |
| 2407 | p = c; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2408 | #endif /* PNG_SLOW_PAETH */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2409 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2410 | v = *dp++ = (png_byte)(((int)*rp++ - p) & 0xff); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2411 | |
| 2412 | sum += (v < 128) ? v : 256 - v; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2413 | |
| 2414 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2415 | break; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2416 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2417 | |
| 2418 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2419 | if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 2420 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 2421 | int j; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2422 | png_uint_32 sumhi, sumlo; |
| 2423 | sumlo = sum & PNG_LOMASK; |
| 2424 | sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; |
| 2425 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2426 | for (j = 0; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2427 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2428 | if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2429 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2430 | sumlo = (sumlo * png_ptr->filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2431 | PNG_WEIGHT_SHIFT; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2432 | sumhi = (sumhi * png_ptr->filter_weights[j]) >> |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2433 | PNG_WEIGHT_SHIFT; |
| 2434 | } |
| 2435 | } |
| 2436 | |
| 2437 | sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >> |
| 2438 | PNG_COST_SHIFT; |
| 2439 | sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >> |
| 2440 | PNG_COST_SHIFT; |
| 2441 | |
| 2442 | if (sumhi > PNG_HIMASK) |
| 2443 | sum = PNG_MAXSUM; |
| 2444 | else |
| 2445 | sum = (sumhi << PNG_HISHIFT) + sumlo; |
| 2446 | } |
| 2447 | #endif |
| 2448 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2449 | if (sum < mins) |
| 2450 | { |
| 2451 | best_row = png_ptr->paeth_row; |
| 2452 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2453 | } |
| 2454 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2455 | /* 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] | 2456 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2457 | png_write_filtered_row(png_ptr, best_row); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2458 | |
| 2459 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 2460 | /* Save the type of filter we picked this time for future calculations */ |
| 2461 | if (png_ptr->num_prev_filters > 0) |
| 2462 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2463 | int j; |
| 2464 | for (j = 1; j < num_p_filters; j++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2465 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2466 | png_ptr->prev_filters[j] = png_ptr->prev_filters[j - 1]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2467 | } |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2468 | png_ptr->prev_filters[j] = best_row[0]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2469 | } |
| 2470 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2471 | } |
| 2472 | |
| 2473 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2474 | /* Do the actual writing of a previously filtered row. */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2475 | void |
| 2476 | png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row) |
| 2477 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2478 | png_debug(1, "in png_write_filtered_row\n"); |
| 2479 | png_debug1(2, "filter = %d\n", filtered_row[0]); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2480 | /* set up the zlib input buffer */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2481 | png_ptr->zstream.next_in = filtered_row; |
| 2482 | png_ptr->zstream.avail_in = (uInt)png_ptr->row_info.rowbytes + 1; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2483 | /* repeat until we have compressed all the data */ |
| 2484 | do |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2485 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2486 | int ret; /* return of zlib */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2487 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2488 | /* compress the data */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2489 | ret = deflate(&png_ptr->zstream, Z_NO_FLUSH); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2490 | /* check for compression errors */ |
| 2491 | if (ret != Z_OK) |
| 2492 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2493 | if (png_ptr->zstream.msg != NULL) |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2494 | png_error(png_ptr, png_ptr->zstream.msg); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2495 | else |
| 2496 | png_error(png_ptr, "zlib error"); |
| 2497 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2498 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2499 | /* see if it is time to write another IDAT */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2500 | if (!(png_ptr->zstream.avail_out)) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2501 | { |
| 2502 | /* write the IDAT and reset the zlib output buffer */ |
| 2503 | png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2504 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 2505 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2506 | } |
| 2507 | /* repeat until all data has been compressed */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2508 | } while (png_ptr->zstream.avail_in); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2509 | |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 2510 | /* swap the current and previous rows */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2511 | if (png_ptr->prev_row != NULL) |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 2512 | { |
| 2513 | png_bytep tptr; |
| 2514 | |
| 2515 | tptr = png_ptr->prev_row; |
| 2516 | png_ptr->prev_row = png_ptr->row_buf; |
| 2517 | png_ptr->row_buf = tptr; |
| 2518 | } |
| 2519 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2520 | /* finish row - updates counters and flushes zlib if last row */ |
| 2521 | png_write_finish_row(png_ptr); |
| 2522 | |
| 2523 | #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
| 2524 | png_ptr->flush_rows++; |
| 2525 | |
| 2526 | if (png_ptr->flush_dist > 0 && |
| 2527 | png_ptr->flush_rows >= png_ptr->flush_dist) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2528 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2529 | png_write_flush(png_ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2530 | } |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame^] | 2531 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2532 | } |