| 1 | |
| 2 | /* png.h - header file for PNG reference library |
| 3 | * |
| 4 | * libpng version 1.0.3 - January 14, 1999 |
| 5 | * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
| 6 | * Copyright (c) 1996, 1997 Andreas Dilger |
| 7 | * Copyright (c) 1998, 1999 Glenn Randers-Pehrson |
| 8 | * |
| 9 | * Y2K compliance in libpng: |
| 10 | * ========================= |
| 11 | * |
| 12 | * January 13, 1999 |
| 13 | * |
| 14 | * Since the PNG Development group is an ad-hoc body, we can't make |
| 15 | * an official declaration. |
| 16 | * |
| 17 | * This is your unofficial assurance that libpng from version 0.81 and |
| 18 | * upward are Y2K compliant. It is my belief that earlier versions were |
| 19 | * also Y2K compliant. |
| 20 | * |
| 21 | * Libpng only has three year fields. One is a 2-byte unsigned integer |
| 22 | * that will hold years up to 65535. The other two hold the date in text |
| 23 | * format, and will hold years up to 9999. |
| 24 | * |
| 25 | * The integer is |
| 26 | * "png_uint_16 year" in png_time_struct. |
| 27 | * |
| 28 | * The strings are |
| 29 | * "png_charp time_buffer" in png_struct and |
| 30 | * "near_time_buffer", which is a local character string in png.c. |
| 31 | * |
| 32 | * There are seven time-related functions: |
| 33 | * png.c: png_convert_to_rfc_1123() in png.c |
| 34 | * (formerly png_convert_to_rfc_1152() in error) |
| 35 | * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c |
| 36 | * png_convert_from_time_t() in pngwrite.c |
| 37 | * png_get_tIME() in pngget.c |
| 38 | * png_handle_tIME() in pngrutil.c, called in pngread.c |
| 39 | * png_set_tIME() in pngset.c |
| 40 | * png_write_tIME() in pngwutil.c, called in pngwrite.c |
| 41 | * |
| 42 | * All handle dates properly in a Y2K environment. The |
| 43 | * png_convert_from_time_t() function calls gmtime() to convert from system |
| 44 | * clock time, which returns (year - 1900), which we properly convert to |
| 45 | * the full 4-digit year. There is a possibility that applications using |
| 46 | * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() |
| 47 | * function, or incorrectly passing only a 2-digit year instead of |
| 48 | * "year - 1900" into the png_convert_from_struct_tm() function, but this |
| 49 | * is not under our control. The libpng documentation has always stated |
| 50 | * that it works with 4-digit years, and the APIs have been documented as |
| 51 | * such. |
| 52 | * |
| 53 | * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned |
| 54 | * integer to hold the year, and can hold years as large as 65535. |
| 55 | * |
| 56 | * |
| 57 | * Glenn Randers-Pehrson |
| 58 | * libpng maintainer |
| 59 | * PNG Development Group |
| 60 | * |
| 61 | * Note about libpng version numbers: |
| 62 | * |
| 63 | * Due to various miscommunications, unforeseen code incompatibilities |
| 64 | * and occasional factors outside the authors' control, version numbering |
| 65 | * on the library has not always been consistent and straightforward. |
| 66 | * The following table summarizes matters since version 0.89c, which was |
| 67 | * the first widely used release: |
| 68 | * |
| 69 | * source png.h png.h shared-lib |
| 70 | * version string int version |
| 71 | * ------- ------ ----- ---------- |
| 72 | * 0.89c ("1.0 beta 3") 0.89 89 1.0.89 |
| 73 | * 0.90 ("1.0 beta 4") 0.90 90 0.90 [should have been 2.0.90] |
| 74 | * 0.95 ("1.0 beta 5") 0.95 95 0.95 [should have been 2.0.95] |
| 75 | * 0.96 ("1.0 beta 6") 0.96 96 0.96 [should have been 2.0.96] |
| 76 | * 0.97b ("1.00.97 beta 7") 1.00.97 97 1.0.1 [should have been 2.0.97] |
| 77 | * 0.97c 0.97 97 2.0.97 |
| 78 | * 0.98 0.98 98 2.0.98 |
| 79 | * 0.99 0.99 98 2.0.99 |
| 80 | * 0.99a-m 0.99 99 2.0.99 |
| 81 | * 1.00 1.00 100 2.1.0 [int should be 10000] |
| 82 | * 1.0.0 1.0.0 100 2.1.0 [int should be 10000] |
| 83 | * 1.0.1 1.0.1 10001 2.1.0 |
| 84 | * 1.0.1a-e 1.0.1a-e 10002 2.1.0.1a-e |
| 85 | * 1.0.2 1.0.2 10002 2.1.0.2 |
| 86 | * 1.0.2a-c 1.0.2a 10003 2.1.0.2a-c |
| 87 | * 1.0.3 1.0.3 10003 2.1.0.3 |
| 88 | * |
| 89 | * Henceforth the source version will match the shared-library minor |
| 90 | * and patch numbers; the shared-library major version number will be |
| 91 | * used for changes in backward compatibility, as it is intended. The |
| 92 | * PNG_PNGLIB_VER macro, which is not used within libpng but is available |
| 93 | * for applications, is an unsigned integer of the form xyyzz corresponding |
| 94 | * to the source version x.y.z (leading zeros in y and z). |
| 95 | * |
| 96 | * See libpng.txt or libpng.3 for more information. The PNG specification |
| 97 | * is available as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/> |
| 98 | * and as a W3C Recommendation <http://www.w3.org/TR/REC.png.html> |
| 99 | * |
| 100 | * Contributing Authors: |
| 101 | * John Bowler |
| 102 | * Kevin Bracey |
| 103 | * Sam Bushell |
| 104 | * Andreas Dilger |
| 105 | * Magnus Holmgren |
| 106 | * Tom Lane |
| 107 | * Dave Martindale |
| 108 | * Glenn Randers-Pehrson |
| 109 | * Greg Roelofs |
| 110 | * Guy Eric Schalnat |
| 111 | * Paul Schmidt |
| 112 | * Tom Tanner |
| 113 | * Willem van Schaik |
| 114 | * Tim Wegner |
| 115 | * |
| 116 | * The contributing authors would like to thank all those who helped |
| 117 | * with testing, bug fixes, and patience. This wouldn't have been |
| 118 | * possible without all of you. |
| 119 | * |
| 120 | * Thanks to Frank J. T. Wojcik for helping with the documentation. |
| 121 | * |
| 122 | * COPYRIGHT NOTICE: |
| 123 | * |
| 124 | * The PNG Reference Library is supplied "AS IS". The Contributing Authors |
| 125 | * and Group 42, Inc. disclaim all warranties, expressed or implied, |
| 126 | * including, without limitation, the warranties of merchantability and of |
| 127 | * fitness for any purpose. The Contributing Authors and Group 42, Inc. |
| 128 | * assume no liability for direct, indirect, incidental, special, exemplary, |
| 129 | * or consequential damages, which may result from the use of the PNG |
| 130 | * Reference Library, even if advised of the possibility of such damage. |
| 131 | * |
| 132 | * Permission is hereby granted to use, copy, modify, and distribute this |
| 133 | * source code, or portions hereof, for any purpose, without fee, subject |
| 134 | * to the following restrictions: |
| 135 | * 1. The origin of this source code must not be misrepresented. |
| 136 | * 2. Altered versions must be plainly marked as such and must not be |
| 137 | * misrepresented as being the original source. |
| 138 | * 3. This Copyright notice may not be removed or altered from any source or |
| 139 | * altered source distribution. |
| 140 | * |
| 141 | * The Contributing Authors and Group 42, Inc. specifically permit, without |
| 142 | * fee, and encourage the use of this source code as a component to |
| 143 | * supporting the PNG file format in commercial products. If you use this |
| 144 | * source code in a product, acknowledgment is not required but would be |
| 145 | * appreciated. |
| 146 | */ |
| 147 | |
| 148 | |
| 149 | #ifndef _PNG_H |
| 150 | #define _PNG_H |
| 151 | |
| 152 | #ifdef __cplusplus |
| 153 | extern "C" { |
| 154 | #endif /* __cplusplus */ |
| 155 | |
| 156 | /* This is not the place to learn how to use libpng. The file libpng.txt |
| 157 | * describes how to use libpng, and the file example.c summarizes it |
| 158 | * with some code on which to build. This file is useful for looking |
| 159 | * at the actual function definitions and structure components. |
| 160 | */ |
| 161 | |
| 162 | /* include the compression library's header */ |
| 163 | #include "zlib.h" |
| 164 | |
| 165 | /* include all user configurable info */ |
| 166 | #include "pngconf.h" |
| 167 | |
| 168 | /* This file is arranged in several sections. The first section contains |
| 169 | * structure and type definitions. The second section contains the external |
| 170 | * library functions, while the third has the internal library functions, |
| 171 | * which applications aren't expected to use directly. |
| 172 | */ |
| 173 | |
| 174 | /* Version information for png.h - this should match the version in png.c */ |
| 175 | #define PNG_LIBPNG_VER_STRING "1.0.3" |
| 176 | |
| 177 | /* Careful here. At one time, Guy wanted to use 082, but that would be octal. |
| 178 | * We must not include leading zeros. |
| 179 | * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only |
| 180 | * version 1.0.0 was mis-numbered 100 instead of 10000). From |
| 181 | * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=bugfix */ |
| 182 | #define PNG_LIBPNG_VER 10003 /* 1.0.3 */ |
| 183 | |
| 184 | /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ |
| 185 | #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) |
| 186 | /* Version information for C files, stored in png.c. This had better match |
| 187 | * the version above. |
| 188 | */ |
| 189 | extern char png_libpng_ver[12]; /* need room for 99.99.99aa */ |
| 190 | |
| 191 | /* Structures to facilitate easy interlacing. See png.c for more details */ |
| 192 | extern int FARDATA png_pass_start[7]; |
| 193 | extern int FARDATA png_pass_inc[7]; |
| 194 | extern int FARDATA png_pass_ystart[7]; |
| 195 | extern int FARDATA png_pass_yinc[7]; |
| 196 | extern int FARDATA png_pass_mask[7]; |
| 197 | extern int FARDATA png_pass_dsp_mask[7]; |
| 198 | /* These aren't currently used. If you need them, see png.c for more details |
| 199 | extern int FARDATA png_pass_width[7]; |
| 200 | extern int FARDATA png_pass_height[7]; |
| 201 | */ |
| 202 | |
| 203 | #endif /* PNG_NO_EXTERN */ |
| 204 | |
| 205 | /* Three color definitions. The order of the red, green, and blue, (and the |
| 206 | * exact size) is not important, although the size of the fields need to |
| 207 | * be png_byte or png_uint_16 (as defined below). |
| 208 | */ |
| 209 | typedef struct png_color_struct |
| 210 | { |
| 211 | png_byte red; |
| 212 | png_byte green; |
| 213 | png_byte blue; |
| 214 | } png_color; |
| 215 | typedef png_color FAR * png_colorp; |
| 216 | typedef png_color FAR * FAR * png_colorpp; |
| 217 | |
| 218 | typedef struct png_color_16_struct |
| 219 | { |
| 220 | png_byte index; /* used for palette files */ |
| 221 | png_uint_16 red; /* for use in red green blue files */ |
| 222 | png_uint_16 green; |
| 223 | png_uint_16 blue; |
| 224 | png_uint_16 gray; /* for use in grayscale files */ |
| 225 | } png_color_16; |
| 226 | typedef png_color_16 FAR * png_color_16p; |
| 227 | typedef png_color_16 FAR * FAR * png_color_16pp; |
| 228 | |
| 229 | typedef struct png_color_8_struct |
| 230 | { |
| 231 | png_byte red; /* for use in red green blue files */ |
| 232 | png_byte green; |
| 233 | png_byte blue; |
| 234 | png_byte gray; /* for use in grayscale files */ |
| 235 | png_byte alpha; /* for alpha channel files */ |
| 236 | } png_color_8; |
| 237 | typedef png_color_8 FAR * png_color_8p; |
| 238 | typedef png_color_8 FAR * FAR * png_color_8pp; |
| 239 | |
| 240 | /* png_text holds the text in a PNG file, and whether they are compressed |
| 241 | in the PNG file or not. The "text" field points to a regular C string. */ |
| 242 | typedef struct png_text_struct |
| 243 | { |
| 244 | int compression; /* compression value, see PNG_TEXT_COMPRESSION_ */ |
| 245 | png_charp key; /* keyword, 1-79 character description of "text" */ |
| 246 | png_charp text; /* comment, may be an empty string (ie "") */ |
| 247 | png_size_t text_length; /* length of "text" field */ |
| 248 | } png_text; |
| 249 | typedef png_text FAR * png_textp; |
| 250 | typedef png_text FAR * FAR * png_textpp; |
| 251 | |
| 252 | /* Supported compression types for text in PNG files (tEXt, and zTXt). |
| 253 | * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ |
| 254 | #define PNG_TEXT_COMPRESSION_NONE_WR -3 |
| 255 | #define PNG_TEXT_COMPRESSION_zTXt_WR -2 |
| 256 | #define PNG_TEXT_COMPRESSION_NONE -1 |
| 257 | #define PNG_TEXT_COMPRESSION_zTXt 0 |
| 258 | #define PNG_TEXT_COMPRESSION_LAST 1 /* Not a valid value */ |
| 259 | |
| 260 | /* png_time is a way to hold the time in an machine independent way. |
| 261 | * Two conversions are provided, both from time_t and struct tm. There |
| 262 | * is no portable way to convert to either of these structures, as far |
| 263 | * as I know. If you know of a portable way, send it to me. As a side |
| 264 | * note - PNG is Year 2000 compliant! |
| 265 | */ |
| 266 | typedef struct png_time_struct |
| 267 | { |
| 268 | png_uint_16 year; /* full year, as in, 1995 */ |
| 269 | png_byte month; /* month of year, 1 - 12 */ |
| 270 | png_byte day; /* day of month, 1 - 31 */ |
| 271 | png_byte hour; /* hour of day, 0 - 23 */ |
| 272 | png_byte minute; /* minute of hour, 0 - 59 */ |
| 273 | png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ |
| 274 | } png_time; |
| 275 | typedef png_time FAR * png_timep; |
| 276 | typedef png_time FAR * FAR * png_timepp; |
| 277 | |
| 278 | /* png_info is a structure that holds the information in a PNG file so |
| 279 | * that the application can find out the characteristics of the image. |
| 280 | * If you are reading the file, this structure will tell you what is |
| 281 | * in the PNG file. If you are writing the file, fill in the information |
| 282 | * you want to put into the PNG file, then call png_write_info(). |
| 283 | * The names chosen should be very close to the PNG specification, so |
| 284 | * consult that document for information about the meaning of each field. |
| 285 | * |
| 286 | * With libpng < 0.95, it was only possible to directly set and read the |
| 287 | * the values in the png_info_struct, which meant that the contents and |
| 288 | * order of the values had to remain fixed. With libpng 0.95 and later, |
| 289 | * however, there are now functions that abstract the contents of |
| 290 | * png_info_struct from the application, so this makes it easier to use |
| 291 | * libpng with dynamic libraries, and even makes it possible to use |
| 292 | * libraries that don't have all of the libpng ancillary chunk-handing |
| 293 | * functionality. |
| 294 | * |
| 295 | * In any case, the order of the parameters in png_info_struct should NOT |
| 296 | * be changed for as long as possible to keep compatibility with applications |
| 297 | * that use the old direct-access method with png_info_struct. |
| 298 | */ |
| 299 | typedef struct png_info_struct |
| 300 | { |
| 301 | /* the following are necessary for every PNG file */ |
| 302 | png_uint_32 width; /* width of image in pixels (from IHDR) */ |
| 303 | png_uint_32 height; /* height of image in pixels (from IHDR) */ |
| 304 | png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ |
| 305 | png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */ |
| 306 | png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */ |
| 307 | png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */ |
| 308 | png_uint_16 num_trans; /* number of transparent palette color (tRNS) */ |
| 309 | png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ |
| 310 | png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */ |
| 311 | png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ |
| 312 | png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ |
| 313 | png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ |
| 314 | |
| 315 | /* The following is informational only on read, and not used on writes. */ |
| 316 | png_byte channels; /* number of data channels per pixel (1, 3, 4)*/ |
| 317 | png_byte pixel_depth; /* number of bits per pixel */ |
| 318 | png_byte spare_byte; /* to align the data, and for future use */ |
| 319 | png_byte signature[8]; /* magic bytes read by libpng from start of file */ |
| 320 | |
| 321 | /* The rest of the data is optional. If you are reading, check the |
| 322 | * valid field to see if the information in these are valid. If you |
| 323 | * are writing, set the valid field to those chunks you want written, |
| 324 | * and initialize the appropriate fields below. |
| 325 | */ |
| 326 | |
| 327 | #if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED) || \ |
| 328 | defined(PNG_READ_GAMMA_SUPPORTED) |
| 329 | /* The gAMA chunk describes the gamma characteristics of the system |
| 330 | * on which the image was created, normally in the range [1.0, 2.5]. |
| 331 | * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. |
| 332 | */ |
| 333 | float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ |
| 334 | #endif /* PNG_READ_gAMA_SUPPORTED || PNG_WRITE_gAMA_SUPPORTED */ |
| 335 | |
| 336 | #if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED) |
| 337 | /* GR-P, 0.96a */ |
| 338 | /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ |
| 339 | png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */ |
| 340 | #endif /* PNG_READ_sRGB_SUPPORTED || PNG_WRITE_sRGB_SUPPORTED */ |
| 341 | |
| 342 | #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \ |
| 343 | defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) |
| 344 | /* The tEXt and zTXt chunks contain human-readable textual data in |
| 345 | * uncompressed and compressed forms, respectively. The data in "text" |
| 346 | * is an array of pointers to uncompressed, null-terminated C strings. |
| 347 | * Each chunk has a keyword that describes the textual data contained |
| 348 | * in that chunk. Keywords are not required to be unique, and the text |
| 349 | * string may be empty. Any number of text chunks may be in an image. |
| 350 | */ |
| 351 | int num_text; /* number of comments read/to write */ |
| 352 | int max_text; /* current size of text array */ |
| 353 | png_textp text; /* array of comments read/to write */ |
| 354 | #endif /* PNG_READ_OR_WRITE_tEXt_OR_zTXt_SUPPORTED */ |
| 355 | #if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED) |
| 356 | /* The tIME chunk holds the last time the displayed image data was |
| 357 | * modified. See the png_time struct for the contents of this struct. |
| 358 | */ |
| 359 | png_time mod_time; |
| 360 | #endif /* PNG_READ_tIME_SUPPORTED || PNG_WRITE_tIME_SUPPORTED */ |
| 361 | #if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED) |
| 362 | /* The sBIT chunk specifies the number of significant high-order bits |
| 363 | * in the pixel data. Values are in the range [1, bit_depth], and are |
| 364 | * only specified for the channels in the pixel data. The contents of |
| 365 | * the low-order bits is not specified. Data is valid if |
| 366 | * (valid & PNG_INFO_sBIT) is non-zero. |
| 367 | */ |
| 368 | png_color_8 sig_bit; /* significant bits in color channels */ |
| 369 | #endif /* PNG_READ_sBIT_SUPPORTED || PNG_WRITE_sBIT_SUPPORTED */ |
| 370 | #if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED) || \ |
| 371 | defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 372 | /* The tRNS chunk supplies transparency data for paletted images and |
| 373 | * other image types that don't need a full alpha channel. There are |
| 374 | * "num_trans" transparency values for a paletted image, stored in the |
| 375 | * same order as the palette colors, starting from index 0. Values |
| 376 | * for the data are in the range [0, 255], ranging from fully transparent |
| 377 | * to fully opaque, respectively. For non-paletted images, there is a |
| 378 | * single color specified that should be treated as fully transparent. |
| 379 | * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. |
| 380 | */ |
| 381 | png_bytep trans; /* transparent values for paletted image */ |
| 382 | png_color_16 trans_values; /* transparent color for non-palette image */ |
| 383 | #endif /* PNG_READ_tRNS_SUPPORTED || PNG_WRITE_tRNS_SUPPORTED */ |
| 384 | #if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED) || \ |
| 385 | defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 386 | /* The bKGD chunk gives the suggested image background color if the |
| 387 | * display program does not have its own background color and the image |
| 388 | * is needs to composited onto a background before display. The colors |
| 389 | * in "background" are normally in the same color space/depth as the |
| 390 | * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. |
| 391 | */ |
| 392 | png_color_16 background; |
| 393 | #endif /* PNG_READ_bKGD_SUPPORTED || PNG_WRITE_bKGD_SUPPORTED */ |
| 394 | #if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED) |
| 395 | /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards |
| 396 | * and downwards from the top-left corner of the display, page, or other |
| 397 | * application-specific co-ordinate space. See the PNG_OFFSET_ defines |
| 398 | * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. |
| 399 | */ |
| 400 | png_uint_32 x_offset; /* x offset on page */ |
| 401 | png_uint_32 y_offset; /* y offset on page */ |
| 402 | png_byte offset_unit_type; /* offset units type */ |
| 403 | #endif /* PNG_READ_oFFs_SUPPORTED || PNG_WRITE_oFFs_SUPPORTED */ |
| 404 | #if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED) |
| 405 | /* The pHYs chunk gives the physical pixel density of the image for |
| 406 | * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ |
| 407 | * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. |
| 408 | */ |
| 409 | png_uint_32 x_pixels_per_unit; /* horizontal pixel density */ |
| 410 | png_uint_32 y_pixels_per_unit; /* vertical pixel density */ |
| 411 | png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */ |
| 412 | #endif /* PNG_READ_pHYs_SUPPORTED || PNG_WRITE_pHYs_SUPPORTED */ |
| 413 | #if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED) |
| 414 | /* The hIST chunk contains the relative frequency or importance of the |
| 415 | * various palette entries, so that a viewer can intelligently select a |
| 416 | * reduced-color palette, if required. Data is an array of "num_palette" |
| 417 | * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) |
| 418 | * is non-zero. |
| 419 | */ |
| 420 | png_uint_16p hist; |
| 421 | #endif /* PNG_READ_hIST_SUPPORTED || PNG_WRITE_hIST_SUPPORTED */ |
| 422 | #if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED) |
| 423 | /* The cHRM chunk describes the CIE color characteristics of the monitor |
| 424 | * on which the PNG was created. This data allows the viewer to do gamut |
| 425 | * mapping of the input image to ensure that the viewer sees the same |
| 426 | * colors in the image as the creator. Values are in the range |
| 427 | * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. |
| 428 | */ |
| 429 | float x_white; |
| 430 | float y_white; |
| 431 | float x_red; |
| 432 | float y_red; |
| 433 | float x_green; |
| 434 | float y_green; |
| 435 | float x_blue; |
| 436 | float y_blue; |
| 437 | #endif /* PNG_READ_cHRM_SUPPORTED || PNG_WRITE_cHRM_SUPPORTED */ |
| 438 | #if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) |
| 439 | /* The pCAL chunk describes a transformation between the stored pixel |
| 440 | * values and original physcical data values used to create the image. |
| 441 | * The integer range [0, 2^bit_depth - 1] maps to the floating-point |
| 442 | * range given by [pcal_X0, pcal_X1], and are further transformed by a |
| 443 | * (possibly non-linear) transformation function given by "pcal_type" |
| 444 | * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ |
| 445 | * defines below, and the PNG-Group's Scientific Visualization extension |
| 446 | * chunks document png-scivis-19970203 for a complete description of the |
| 447 | * transformations and how they should be implemented, as well as the |
| 448 | * png-extensions document for a description of the ASCII parameter |
| 449 | * strings. Data values are valid if (valid & PNG_INFO_pCAL) non-zero. |
| 450 | */ |
| 451 | png_charp pcal_purpose; /* pCAL chunk description string */ |
| 452 | png_int_32 pcal_X0; /* minimum value */ |
| 453 | png_int_32 pcal_X1; /* maximum value */ |
| 454 | png_charp pcal_units; /* Latin-1 string giving physical units */ |
| 455 | png_charpp pcal_params; /* ASCII strings containing parameter values */ |
| 456 | png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */ |
| 457 | png_byte pcal_nparams; /* number of parameters given in pcal_params */ |
| 458 | #endif /* PNG_READ_pCAL_SUPPORTED || PNG_WRITE_pCAL_SUPPORTED */ |
| 459 | } png_info; |
| 460 | typedef png_info FAR * png_infop; |
| 461 | typedef png_info FAR * FAR * png_infopp; |
| 462 | |
| 463 | /* These describe the color_type field in png_info. */ |
| 464 | /* color type masks */ |
| 465 | #define PNG_COLOR_MASK_PALETTE 1 |
| 466 | #define PNG_COLOR_MASK_COLOR 2 |
| 467 | #define PNG_COLOR_MASK_ALPHA 4 |
| 468 | |
| 469 | /* color types. Note that not all combinations are legal */ |
| 470 | #define PNG_COLOR_TYPE_GRAY 0 |
| 471 | #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) |
| 472 | #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) |
| 473 | #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) |
| 474 | #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) |
| 475 | |
| 476 | /* This is for compression type. PNG 1.0 only defines the single type. */ |
| 477 | #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ |
| 478 | #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE |
| 479 | |
| 480 | /* This is for filter type. PNG 1.0 only defines the single type. */ |
| 481 | #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ |
| 482 | #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE |
| 483 | |
| 484 | /* These are for the interlacing type. These values should NOT be changed. */ |
| 485 | #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ |
| 486 | #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ |
| 487 | #define PNG_INTERLACE_LAST 2 /* Not a valid value */ |
| 488 | |
| 489 | /* These are for the oFFs chunk. These values should NOT be changed. */ |
| 490 | #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ |
| 491 | #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ |
| 492 | #define PNG_OFFSET_LAST 2 /* Not a valid value */ |
| 493 | |
| 494 | /* These are for the pCAL chunk. These values should NOT be changed. */ |
| 495 | #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ |
| 496 | #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ |
| 497 | #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ |
| 498 | #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ |
| 499 | #define PNG_EQUATION_LAST 4 /* Not a valid value */ |
| 500 | |
| 501 | /* These are for the pHYs chunk. These values should NOT be changed. */ |
| 502 | #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ |
| 503 | #define PNG_RESOLUTION_METER 1 /* pixels/meter */ |
| 504 | #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ |
| 505 | |
| 506 | /* These are for the sRGB chunk. These values should NOT be changed. */ |
| 507 | #define PNG_sRGB_INTENT_SATURATION 0 |
| 508 | #define PNG_sRGB_INTENT_PERCEPTUAL 1 |
| 509 | #define PNG_sRGB_INTENT_ABSOLUTE 2 |
| 510 | #define PNG_sRGB_INTENT_RELATIVE 3 |
| 511 | #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ |
| 512 | |
| 513 | |
| 514 | |
| 515 | /* These determine if an ancillary chunk's data has been successfully read |
| 516 | * from the PNG header, or if the application has filled in the corresponding |
| 517 | * data in the info_struct to be written into the output file. The values |
| 518 | * of the PNG_INFO_<chunk> defines should NOT be changed. |
| 519 | */ |
| 520 | #define PNG_INFO_gAMA 0x0001 |
| 521 | #define PNG_INFO_sBIT 0x0002 |
| 522 | #define PNG_INFO_cHRM 0x0004 |
| 523 | #define PNG_INFO_PLTE 0x0008 |
| 524 | #define PNG_INFO_tRNS 0x0010 |
| 525 | #define PNG_INFO_bKGD 0x0020 |
| 526 | #define PNG_INFO_hIST 0x0040 |
| 527 | #define PNG_INFO_pHYs 0x0080 |
| 528 | #define PNG_INFO_oFFs 0x0100 |
| 529 | #define PNG_INFO_tIME 0x0200 |
| 530 | #define PNG_INFO_pCAL 0x0400 |
| 531 | #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ |
| 532 | |
| 533 | /* This is used for the transformation routines, as some of them |
| 534 | * change these values for the row. It also should enable using |
| 535 | * the routines for other purposes. |
| 536 | */ |
| 537 | typedef struct png_row_info_struct |
| 538 | { |
| 539 | png_uint_32 width; /* width of row */ |
| 540 | png_uint_32 rowbytes; /* number of bytes in row */ |
| 541 | png_byte color_type; /* color type of row */ |
| 542 | png_byte bit_depth; /* bit depth of row */ |
| 543 | png_byte channels; /* number of channels (1, 2, 3, or 4) */ |
| 544 | png_byte pixel_depth; /* bits per pixel (depth * channels) */ |
| 545 | } png_row_info; |
| 546 | |
| 547 | typedef png_row_info FAR * png_row_infop; |
| 548 | typedef png_row_info FAR * FAR * png_row_infopp; |
| 549 | |
| 550 | /* These are the function types for the I/O functions and for the functions |
| 551 | * that allow the user to override the default I/O functions with his or her |
| 552 | * own. The png_error_ptr type should match that of user-supplied warning |
| 553 | * and error functions, while the png_rw_ptr type should match that of the |
| 554 | * user read/write data functions. |
| 555 | */ |
| 556 | typedef struct png_struct_def png_struct; |
| 557 | typedef png_struct FAR * png_structp; |
| 558 | |
| 559 | typedef void (*png_error_ptr) PNGARG((png_structp, png_const_charp)); |
| 560 | typedef void (*png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); |
| 561 | typedef void (*png_flush_ptr) PNGARG((png_structp)); |
| 562 | typedef void (*png_read_status_ptr) PNGARG((png_structp, png_uint_32, int)); |
| 563 | typedef void (*png_write_status_ptr) PNGARG((png_structp, png_uint_32, int)); |
| 564 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 565 | typedef void (*png_progressive_info_ptr) PNGARG((png_structp, png_infop)); |
| 566 | typedef void (*png_progressive_end_ptr) PNGARG((png_structp, png_infop)); |
| 567 | typedef void (*png_progressive_row_ptr) PNGARG((png_structp, png_bytep, |
| 568 | png_uint_32, int)); |
| 569 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| 570 | |
| 571 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
| 572 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
| 573 | typedef void (*png_user_transform_ptr) PNGARG((png_structp, |
| 574 | png_row_infop, png_bytep)); |
| 575 | #endif /* PNG_READ|WRITE_USER_TRANSFORM_SUPPORTED */ |
| 576 | |
| 577 | typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); |
| 578 | typedef void (*png_free_ptr) PNGARG((png_structp, png_structp)); |
| 579 | |
| 580 | /* The structure that holds the information to read and write PNG files. |
| 581 | * The only people who need to care about what is inside of this are the |
| 582 | * people who will be modifying the library for their own special needs. |
| 583 | * It should NOT be accessed directly by an application, except to store |
| 584 | * the jmp_buf. |
| 585 | */ |
| 586 | |
| 587 | struct png_struct_def |
| 588 | { |
| 589 | jmp_buf jmpbuf; /* used in png_error */ |
| 590 | |
| 591 | png_error_ptr error_fn; /* function for printing errors and aborting */ |
| 592 | png_error_ptr warning_fn; /* function for printing warnings */ |
| 593 | png_voidp error_ptr; /* user supplied struct for error functions */ |
| 594 | png_rw_ptr write_data_fn; /* function for writing output data */ |
| 595 | png_rw_ptr read_data_fn; /* function for reading input data */ |
| 596 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
| 597 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
| 598 | png_user_transform_ptr read_user_transform_fn; /* user read transform */ |
| 599 | png_user_transform_ptr write_user_transform_fn; /* user write transform */ |
| 600 | #endif |
| 601 | png_voidp io_ptr; /* ptr to application struct for I/O functions*/ |
| 602 | |
| 603 | png_uint_32 mode; /* tells us where we are in the PNG file */ |
| 604 | png_uint_32 flags; /* flags indicating various things to libpng */ |
| 605 | png_uint_32 transformations; /* which transformations to perform */ |
| 606 | |
| 607 | z_stream zstream; /* pointer to decompression structure (below) */ |
| 608 | png_bytep zbuf; /* buffer for zlib */ |
| 609 | png_size_t zbuf_size; /* size of zbuf */ |
| 610 | int zlib_level; /* holds zlib compression level */ |
| 611 | int zlib_method; /* holds zlib compression method */ |
| 612 | int zlib_window_bits; /* holds zlib compression window bits */ |
| 613 | int zlib_mem_level; /* holds zlib compression memory level */ |
| 614 | int zlib_strategy; /* holds zlib compression strategy */ |
| 615 | |
| 616 | png_uint_32 width; /* width of image in pixels */ |
| 617 | png_uint_32 height; /* height of image in pixels */ |
| 618 | png_uint_32 num_rows; /* number of rows in current pass */ |
| 619 | png_uint_32 usr_width; /* width of row at start of write */ |
| 620 | png_uint_32 rowbytes; /* size of row in bytes */ |
| 621 | png_uint_32 irowbytes; /* size of current interlaced row in bytes */ |
| 622 | png_uint_32 iwidth; /* width of current interlaced row in pixels */ |
| 623 | png_uint_32 row_number; /* current row in interlace pass */ |
| 624 | png_bytep prev_row; /* buffer to save previous (unfiltered) row */ |
| 625 | png_bytep row_buf; /* buffer to save current (unfiltered) row */ |
| 626 | png_bytep sub_row; /* buffer to save "sub" row when filtering */ |
| 627 | png_bytep up_row; /* buffer to save "up" row when filtering */ |
| 628 | png_bytep avg_row; /* buffer to save "avg" row when filtering */ |
| 629 | png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ |
| 630 | png_row_info row_info; /* used for transformation routines */ |
| 631 | |
| 632 | png_uint_32 idat_size; /* current IDAT size for read */ |
| 633 | png_uint_32 crc; /* current chunk CRC value */ |
| 634 | png_colorp palette; /* palette from the input file */ |
| 635 | png_uint_16 num_palette; /* number of color entries in palette */ |
| 636 | png_uint_16 num_trans; /* number of transparency values */ |
| 637 | png_byte chunk_name[5]; /* null-terminated name of current chunk */ |
| 638 | png_byte compression; /* file compression type (always 0) */ |
| 639 | png_byte filter; /* file filter type (always 0) */ |
| 640 | png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ |
| 641 | png_byte pass; /* current interlace pass (0 - 6) */ |
| 642 | png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ |
| 643 | png_byte color_type; /* color type of file */ |
| 644 | png_byte bit_depth; /* bit depth of file */ |
| 645 | png_byte usr_bit_depth; /* bit depth of users row */ |
| 646 | png_byte pixel_depth; /* number of bits per pixel */ |
| 647 | png_byte channels; /* number of channels in file */ |
| 648 | png_byte usr_channels; /* channels at start of write */ |
| 649 | png_byte sig_bytes; /* magic bytes read/written from start of file */ |
| 650 | |
| 651 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
| 652 | png_uint_16 filler; /* filler bytes for pixel expansion */ |
| 653 | #endif /* PNG_READ_FILLER_SUPPORTED */ |
| 654 | #if defined(PNG_READ_bKGD_SUPPORTED) |
| 655 | png_byte background_gamma_type; |
| 656 | float background_gamma; |
| 657 | png_color_16 background; /* background color in screen gamma space */ |
| 658 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
| 659 | png_color_16 background_1; /* background normalized to gamma 1.0 */ |
| 660 | #endif /* PNG_READ_GAMMA && PNG_READ_bKGD_SUPPORTED */ |
| 661 | #endif /* PNG_READ_bKGD_SUPPORTED */ |
| 662 | #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
| 663 | png_flush_ptr output_flush_fn;/* Function for flushing output */ |
| 664 | png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ |
| 665 | png_uint_32 flush_rows; /* number of rows written since last flush */ |
| 666 | #endif /* PNG_WRITE_FLUSH_SUPPORTED */ |
| 667 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 668 | int gamma_shift; /* number of "insignificant" bits 16-bit gamma */ |
| 669 | float gamma; /* file gamma value */ |
| 670 | float screen_gamma; /* screen gamma value (display_gamma/viewing_gamma */ |
| 671 | #endif /* PNG_READ_GAMMA_SUPPORTED */ |
| 672 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 673 | png_bytep gamma_table; /* gamma table for 8 bit depth files */ |
| 674 | png_bytep gamma_from_1; /* converts from 1.0 to screen */ |
| 675 | png_bytep gamma_to_1; /* converts from file to 1.0 */ |
| 676 | png_uint_16pp gamma_16_table; /* gamma table for 16 bit depth files */ |
| 677 | png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ |
| 678 | png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ |
| 679 | #endif /* PNG_READ_GAMMA_SUPPORTED || PNG_WRITE_GAMMA_SUPPORTED */ |
| 680 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined (PNG_READ_sBIT_SUPPORTED) |
| 681 | png_color_8 sig_bit; /* significant bits in each available channel */ |
| 682 | #endif /* PNG_READ_GAMMA_SUPPORTED || PNG_READ_sBIT_SUPPORTED */ |
| 683 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
| 684 | png_color_8 shift; /* shift for significant bit tranformation */ |
| 685 | #endif /* PNG_READ_SHIFT_SUPPORTED || PNG_WRITE_SHIFT_SUPPORTED */ |
| 686 | #if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ |
| 687 | || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 688 | png_bytep trans; /* transparency values for paletted files */ |
| 689 | png_color_16 trans_values; /* transparency values for non-paletted files */ |
| 690 | #endif /* PNG_READ|WRITE_tRNS_SUPPORTED||PNG_READ_EXPAND|BACKGROUND_SUPPORTED */ |
| 691 | png_read_status_ptr read_row_fn; /* called after each row is decoded */ |
| 692 | png_write_status_ptr write_row_fn; /* called after each row is encoded */ |
| 693 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 694 | png_progressive_info_ptr info_fn; /* called after header data fully read */ |
| 695 | png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */ |
| 696 | png_progressive_end_ptr end_fn; /* called after image is complete */ |
| 697 | png_bytep save_buffer_ptr; /* current location in save_buffer */ |
| 698 | png_bytep save_buffer; /* buffer for previously read data */ |
| 699 | png_bytep current_buffer_ptr; /* current location in current_buffer */ |
| 700 | png_bytep current_buffer; /* buffer for recently used data */ |
| 701 | png_uint_32 push_length; /* size of current input chunk */ |
| 702 | png_uint_32 skip_length; /* bytes to skip in input data */ |
| 703 | png_size_t save_buffer_size; /* amount of data now in save_buffer */ |
| 704 | png_size_t save_buffer_max; /* total size of save_buffer */ |
| 705 | png_size_t buffer_size; /* total amount of available input data */ |
| 706 | png_size_t current_buffer_size; /* amount of data now in current_buffer */ |
| 707 | int process_mode; /* what push library is currently doing */ |
| 708 | int cur_palette; /* current push library palette index */ |
| 709 | #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED) |
| 710 | png_size_t current_text_size; /* current size of text input data */ |
| 711 | png_size_t current_text_left; /* how much text left to read in input */ |
| 712 | png_charp current_text; /* current text chunk buffer */ |
| 713 | png_charp current_text_ptr; /* current location in current_text */ |
| 714 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_READ_tEXt/zTXt_SUPPORTED */ |
| 715 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| 716 | #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) |
| 717 | /* for the Borland special 64K segment handler */ |
| 718 | png_bytepp offset_table_ptr; |
| 719 | png_bytep offset_table; |
| 720 | png_uint_16 offset_table_number; |
| 721 | png_uint_16 offset_table_count; |
| 722 | png_uint_16 offset_table_count_free; |
| 723 | #endif /* __TURBOC__&&!_Windows&&!__FLAT__ */ |
| 724 | #if defined(PNG_READ_DITHER_SUPPORTED) |
| 725 | png_bytep palette_lookup; /* lookup table for dithering */ |
| 726 | png_bytep dither_index; /* index translation for palette files */ |
| 727 | #endif /* PNG_READ_DITHER_SUPPORTED */ |
| 728 | #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_READ_hIST_SUPPORTED) |
| 729 | png_uint_16p hist; /* histogram */ |
| 730 | #endif |
| 731 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 732 | png_byte heuristic_method; /* heuristic for row filter selection */ |
| 733 | png_byte num_prev_filters; /* number of weights for previous rows */ |
| 734 | png_bytep prev_filters; /* filter type(s) of previous row(s) */ |
| 735 | png_uint_16p filter_weights; /* weight(s) for previous line(s) */ |
| 736 | png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ |
| 737 | png_uint_16p filter_costs; /* relative filter calculation cost */ |
| 738 | png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ |
| 739 | #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
| 740 | #if defined(PNG_TIME_RFC1123_SUPPORTED) |
| 741 | png_charp time_buffer; /* String to hold RFC 1123 time text */ |
| 742 | #endif /* PNG_TIME_RFC1123_SUPPORTED */ |
| 743 | #ifdef PNG_USER_MEM_SUPPORTED |
| 744 | png_voidp mem_ptr; /* user supplied struct for mem functions */ |
| 745 | png_malloc_ptr malloc_fn; /* function for allocating memory */ |
| 746 | png_free_ptr free_fn; /* function for freeing memory */ |
| 747 | #endif /* PNG_USER_MEM_SUPPORTED */ |
| 748 | #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
| 749 | png_byte rgb_to_gray_status; |
| 750 | png_byte rgb_to_gray_red_coeff; |
| 751 | png_byte rgb_to_gray_green_coeff; |
| 752 | png_byte rgb_to_gray_blue_coeff; |
| 753 | #endif |
| 754 | }; |
| 755 | |
| 756 | typedef png_struct FAR * FAR * png_structpp; |
| 757 | |
| 758 | /* Here are the function definitions most commonly used. This is not |
| 759 | * the place to find out how to use libpng. See libpng.txt for the |
| 760 | * full explanation, see example.c for the summary. This just provides |
| 761 | * a simple one line of the use of each function. |
| 762 | */ |
| 763 | |
| 764 | /* Tell lib we have already handled the first <num_bytes> magic bytes. |
| 765 | * Handling more than 8 bytes from the beginning of the file is an error. |
| 766 | */ |
| 767 | extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, |
| 768 | int num_bytes)); |
| 769 | |
| 770 | /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a |
| 771 | * PNG file. Returns zero if the supplied bytes match the 8-byte PNG |
| 772 | * signature, and non-zero otherwise. Having num_to_check == 0 or |
| 773 | * start > 7 will always fail (ie return non-zero). |
| 774 | */ |
| 775 | extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, |
| 776 | png_size_t num_to_check)); |
| 777 | |
| 778 | /* Simple signature checking function. This is the same as calling |
| 779 | * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). |
| 780 | */ |
| 781 | extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)); |
| 782 | |
| 783 | /* Allocate and initialize png_ptr struct for reading, and any other memory. */ |
| 784 | extern PNG_EXPORT(png_structp,png_create_read_struct) |
| 785 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
| 786 | png_error_ptr error_fn, png_error_ptr warn_fn)); |
| 787 | |
| 788 | /* Allocate and initialize png_ptr struct for writing, and any other memory */ |
| 789 | extern PNG_EXPORT(png_structp,png_create_write_struct) |
| 790 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
| 791 | png_error_ptr error_fn, png_error_ptr warn_fn)); |
| 792 | |
| 793 | #ifdef PNG_USER_MEM_SUPPORTED |
| 794 | extern PNG_EXPORT(png_structp,png_create_read_struct_2) |
| 795 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
| 796 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
| 797 | png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
| 798 | extern PNG_EXPORT(png_structp,png_create_write_struct_2) |
| 799 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
| 800 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
| 801 | png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
| 802 | #endif |
| 803 | |
| 804 | /* Write a PNG chunk - size, type, (optional) data, CRC. */ |
| 805 | extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, |
| 806 | png_bytep chunk_name, png_bytep data, png_size_t length)); |
| 807 | |
| 808 | /* Write the start of a PNG chunk - length and chunk name. */ |
| 809 | extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, |
| 810 | png_bytep chunk_name, png_uint_32 length)); |
| 811 | |
| 812 | /* Write the data of a PNG chunk started with png_write_chunk_start(). */ |
| 813 | extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, |
| 814 | png_bytep data, png_size_t length)); |
| 815 | |
| 816 | /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ |
| 817 | extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); |
| 818 | |
| 819 | /* Allocate and initialize the info structure */ |
| 820 | extern PNG_EXPORT(png_infop,png_create_info_struct) |
| 821 | PNGARG((png_structp png_ptr)); |
| 822 | |
| 823 | /* Initialize the info structure (old interface - NOT DLL EXPORTED) */ |
| 824 | extern void png_info_init PNGARG((png_infop info_ptr)); |
| 825 | |
| 826 | /* Writes all the PNG information before the image. */ |
| 827 | extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, |
| 828 | png_infop info_ptr)); |
| 829 | |
| 830 | /* read the information before the actual image data. */ |
| 831 | extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, |
| 832 | png_infop info_ptr)); |
| 833 | |
| 834 | #if defined(PNG_TIME_RFC1123_SUPPORTED) |
| 835 | extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) |
| 836 | PNGARG((png_structp png_ptr, png_timep ptime)); |
| 837 | #endif /* PNG_TIME_RFC1123_SUPPORTED */ |
| 838 | |
| 839 | #if defined(PNG_WRITE_tIME_SUPPORTED) |
| 840 | /* convert from a struct tm to png_time */ |
| 841 | extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, |
| 842 | struct tm FAR * ttime)); |
| 843 | |
| 844 | /* convert from time_t to png_time. Uses gmtime() */ |
| 845 | extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, |
| 846 | time_t ttime)); |
| 847 | #endif /* PNG_WRITE_tIME_SUPPORTED */ |
| 848 | |
| 849 | #if defined(PNG_READ_EXPAND_SUPPORTED) |
| 850 | /* Expand data to 24 bit RGB, or 8 bit grayscale, with alpha if available. */ |
| 851 | extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); |
| 852 | #endif /* PNG_READ_EXPAND_SUPPORTED */ |
| 853 | |
| 854 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
| 855 | /* Use blue, green, red order for pixels. */ |
| 856 | extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); |
| 857 | #endif /* PNG_READ_BGR_SUPPORTED || PNG_WRITE_BGR_SUPPORTED */ |
| 858 | |
| 859 | #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) |
| 860 | /* Expand the grayscale to 24 bit RGB if necessary. */ |
| 861 | extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); |
| 862 | #endif /* PNG_READ_GRAY_TO_RGB_SUPPORTED */ |
| 863 | |
| 864 | #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
| 865 | /* Reduce RGB to grayscale. */ |
| 866 | extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, |
| 867 | int error_action, float red, float green )); |
| 868 | extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp |
| 869 | png_ptr)); |
| 870 | #endif /* PNG_READ_RGB_TO_GRAY_SUPPORTED */ |
| 871 | |
| 872 | extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, |
| 873 | png_colorp palette)); |
| 874 | |
| 875 | #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
| 876 | extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); |
| 877 | #endif /* PNG_READ_STRIP_ALPHA_SUPPORTED */ |
| 878 | |
| 879 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
| 880 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
| 881 | extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); |
| 882 | #endif /* PNG_READ_SWAP_ALPHA_SUPPORTED || PNG_WRITE_SWAP_ALPHA_SUPPORTED */ |
| 883 | |
| 884 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ |
| 885 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
| 886 | extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); |
| 887 | #endif /* PNG_READ_INVERT_ALPHA_SUPPORTED || PNG_WRITE_INVERT_ALPHA_SUPPORTED */ |
| 888 | |
| 889 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
| 890 | /* Add a filler byte to 24-bit RGB images. */ |
| 891 | extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, |
| 892 | png_uint_32 filler, int flags)); |
| 893 | |
| 894 | /* The values of the PNG_FILLER_ defines should NOT be changed */ |
| 895 | #define PNG_FILLER_BEFORE 0 |
| 896 | #define PNG_FILLER_AFTER 1 |
| 897 | #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ |
| 898 | |
| 899 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
| 900 | /* Swap bytes in 16 bit depth files. */ |
| 901 | extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); |
| 902 | #endif /* PNG_READ_SWAP_SUPPORTED || PNG_WRITE_SWAP_SUPPORTED */ |
| 903 | |
| 904 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
| 905 | /* Use 1 byte per pixel in 1, 2, or 4 bit depth files. */ |
| 906 | extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); |
| 907 | #endif /* PNG_READ_PACK_SUPPORTED || PNG_WRITE_PACK_SUPPORTED */ |
| 908 | |
| 909 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
| 910 | /* Swap packing order of pixels in bytes. */ |
| 911 | extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); |
| 912 | #endif /* PNG_READ_PACKSWAP_SUPPORTED || PNG_WRITE_PACKSWAP_SUPPOR */ |
| 913 | |
| 914 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
| 915 | /* Converts files to legal bit depths. */ |
| 916 | extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, |
| 917 | png_color_8p true_bits)); |
| 918 | #endif /* PNG_READ_SHIFT_SUPPORTED || PNG_WRITE_SHIFT_SUPPORTED */ |
| 919 | |
| 920 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
| 921 | defined(PNG_WRITE_INTERLACING_SUPPORTED) |
| 922 | /* Have the code handle the interlacing. Returns the number of passes. */ |
| 923 | extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); |
| 924 | #endif /* PNG_READ_INTERLACING_SUPPORTED || PNG_WRITE_INTERLACING_SUPPORTED */ |
| 925 | |
| 926 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
| 927 | /* Invert monocrome files */ |
| 928 | extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); |
| 929 | #endif /* PNG_READ_INVERT_SUPPORTED || PNG_WRITE_INVERT_SUPPORTED */ |
| 930 | |
| 931 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 932 | /* Handle alpha and tRNS by replacing with a background color. */ |
| 933 | extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, |
| 934 | png_color_16p background_color, int background_gamma_code, |
| 935 | int need_expand, double background_gamma)); |
| 936 | #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 |
| 937 | #define PNG_BACKGROUND_GAMMA_SCREEN 1 |
| 938 | #define PNG_BACKGROUND_GAMMA_FILE 2 |
| 939 | #define PNG_BACKGROUND_GAMMA_UNIQUE 3 |
| 940 | #endif /* PNG_READ_BACKGROUND_SUPPORTED */ |
| 941 | |
| 942 | #if defined(PNG_READ_16_TO_8_SUPPORTED) |
| 943 | /* strip the second byte of information from a 16 bit depth file. */ |
| 944 | extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); |
| 945 | #endif /* PNG_READ_16_TO_8_SUPPORTED */ |
| 946 | |
| 947 | #if defined(PNG_READ_DITHER_SUPPORTED) |
| 948 | /* Turn on dithering, and reduce the palette to the number of colors available. */ |
| 949 | extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, |
| 950 | png_colorp palette, int num_palette, int maximum_colors, |
| 951 | png_uint_16p histogram, int full_dither)); |
| 952 | #endif /* PNG_READ_DITHER_SUPPORTED */ |
| 953 | |
| 954 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
| 955 | /* Handle gamma correction. Screen_gamma=(display_gamma/viewing_gamma) */ |
| 956 | extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, |
| 957 | double screen_gamma, double default_file_gamma)); |
| 958 | #endif /* PNG_READ_GAMMA_SUPPORTED */ |
| 959 | |
| 960 | #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
| 961 | /* Set how many lines between output flushes - 0 for no flushing */ |
| 962 | extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); |
| 963 | |
| 964 | /* Flush the current PNG output buffer */ |
| 965 | extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); |
| 966 | #endif /* PNG_WRITE_FLUSH_SUPPORTED */ |
| 967 | |
| 968 | /* optional update palette with requested transformations */ |
| 969 | extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); |
| 970 | |
| 971 | /* optional call to update the users info structure */ |
| 972 | extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, |
| 973 | png_infop info_ptr)); |
| 974 | |
| 975 | /* read a one or more rows of image data.*/ |
| 976 | extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, |
| 977 | png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); |
| 978 | |
| 979 | /* read a row of data.*/ |
| 980 | extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, |
| 981 | png_bytep row, |
| 982 | png_bytep display_row)); |
| 983 | |
| 984 | /* read the whole image into memory at once. */ |
| 985 | extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, |
| 986 | png_bytepp image)); |
| 987 | |
| 988 | /* write a row of image data */ |
| 989 | extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, |
| 990 | png_bytep row)); |
| 991 | |
| 992 | /* write a few rows of image data */ |
| 993 | extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, |
| 994 | png_bytepp row, png_uint_32 num_rows)); |
| 995 | |
| 996 | /* write the image data */ |
| 997 | extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, |
| 998 | png_bytepp image)); |
| 999 | |
| 1000 | /* writes the end of the PNG file. */ |
| 1001 | extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, |
| 1002 | png_infop info_ptr)); |
| 1003 | |
| 1004 | /* read the end of the PNG file. */ |
| 1005 | extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, |
| 1006 | png_infop info_ptr)); |
| 1007 | |
| 1008 | /* free any memory associated with the png_info_struct */ |
| 1009 | extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, |
| 1010 | png_infopp info_ptr_ptr)); |
| 1011 | |
| 1012 | /* free any memory associated with the png_struct and the png_info_structs */ |
| 1013 | extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp |
| 1014 | png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); |
| 1015 | |
| 1016 | /* free all memory used by the read (old method - NOT DLL EXPORTED) */ |
| 1017 | extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 1018 | png_infop end_info_ptr)); |
| 1019 | |
| 1020 | /* free any memory associated with the png_struct and the png_info_structs */ |
| 1021 | extern PNG_EXPORT(void,png_destroy_write_struct) |
| 1022 | PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); |
| 1023 | |
| 1024 | /* free any memory used in info_ptr struct (old method - NOT DLL EXPORTED) */ |
| 1025 | extern void png_write_destroy_info PNGARG((png_infop info_ptr)); |
| 1026 | |
| 1027 | /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ |
| 1028 | extern void png_write_destroy PNGARG((png_structp png_ptr)); |
| 1029 | |
| 1030 | /* set the libpng method of handling chunk CRC errors */ |
| 1031 | extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, |
| 1032 | int crit_action, int ancil_action)); |
| 1033 | |
| 1034 | /* Values for png_set_crc_action() to say how to handle CRC errors in |
| 1035 | * ancillary and critical chunks, and whether to use the data contained |
| 1036 | * therein. Note that it is impossible to "discard" data in a critical |
| 1037 | * chunk. For versions prior to 0.90, the action was always error/quit, |
| 1038 | * whereas in version 0.90 and later, the action for CRC errors in ancillary |
| 1039 | * chunks is warn/discard. These values should NOT be changed. |
| 1040 | * |
| 1041 | * value action:critical action:ancillary |
| 1042 | */ |
| 1043 | #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ |
| 1044 | #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ |
| 1045 | #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ |
| 1046 | #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ |
| 1047 | #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ |
| 1048 | #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ |
| 1049 | |
| 1050 | /* These functions give the user control over the scan-line filtering in |
| 1051 | * libpng and the compression methods used by zlib. These functions are |
| 1052 | * mainly useful for testing, as the defaults should work with most users. |
| 1053 | * Those users who are tight on memory or want faster performance at the |
| 1054 | * expense of compression can modify them. See the compression library |
| 1055 | * header file (zlib.h) for an explination of the compression functions. |
| 1056 | */ |
| 1057 | |
| 1058 | /* set the filtering method(s) used by libpng. Currently, the only valid |
| 1059 | * value for "method" is 0. |
| 1060 | */ |
| 1061 | extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, |
| 1062 | int filters)); |
| 1063 | |
| 1064 | /* Flags for png_set_filter() to say which filters to use. The flags |
| 1065 | * are chosen so that they don't conflict with real filter types |
| 1066 | * below, in case they are supplied instead of the #defined constants. |
| 1067 | * These values should NOT be changed. |
| 1068 | */ |
| 1069 | #define PNG_NO_FILTERS 0x00 |
| 1070 | #define PNG_FILTER_NONE 0x08 |
| 1071 | #define PNG_FILTER_SUB 0x10 |
| 1072 | #define PNG_FILTER_UP 0x20 |
| 1073 | #define PNG_FILTER_AVG 0x40 |
| 1074 | #define PNG_FILTER_PAETH 0x80 |
| 1075 | #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ |
| 1076 | PNG_FILTER_AVG | PNG_FILTER_PAETH) |
| 1077 | |
| 1078 | /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. |
| 1079 | * These defines should NOT be changed. |
| 1080 | */ |
| 1081 | #define PNG_FILTER_VALUE_NONE 0 |
| 1082 | #define PNG_FILTER_VALUE_SUB 1 |
| 1083 | #define PNG_FILTER_VALUE_UP 2 |
| 1084 | #define PNG_FILTER_VALUE_AVG 3 |
| 1085 | #define PNG_FILTER_VALUE_PAETH 4 |
| 1086 | #define PNG_FILTER_VALUE_LAST 5 |
| 1087 | |
| 1088 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ |
| 1089 | /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ |
| 1090 | * defines, either the default (minimum-sum-of-absolute-differences), or |
| 1091 | * the experimental method (weighted-minimum-sum-of-absolute-differences). |
| 1092 | * |
| 1093 | * Weights are factors >= 1.0, indicating how important it is to keep the |
| 1094 | * filter type consistent between rows. Larger numbers mean the current |
| 1095 | * filter is that many times as likely to be the same as the "num_weights" |
| 1096 | * previous filters. This is cumulative for each previous row with a weight. |
| 1097 | * There needs to be "num_weights" values in "filter_weights", or it can be |
| 1098 | * NULL if the weights aren't being specified. Weights have no influence on |
| 1099 | * the selection of the first row filter. Well chosen weights can (in theory) |
| 1100 | * improve the compression for a given image. |
| 1101 | * |
| 1102 | * Costs are factors >= 1.0 indicating the relative decoding costs of a |
| 1103 | * filter type. Higher costs indicate more decoding expense, and are |
| 1104 | * therefore less likely to be selected over a filter with lower computational |
| 1105 | * costs. There needs to be a value in "filter_costs" for each valid filter |
| 1106 | * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't |
| 1107 | * setting the costs. Costs try to improve the speed of decompression without |
| 1108 | * unduly increasing the compressed image size. |
| 1109 | * |
| 1110 | * A negative weight or cost indicates the default value is to be used, and |
| 1111 | * values in the range [0.0, 1.0) indicate the value is to remain unchanged. |
| 1112 | * The default values for both weights and costs are currently 1.0, but may |
| 1113 | * change if good general weighting/cost heuristics can be found. If both |
| 1114 | * the weights and costs are set to 1.0, this degenerates the WEIGHTED method |
| 1115 | * to the UNWEIGHTED method, but with added encoding time/computation. |
| 1116 | */ |
| 1117 | extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, |
| 1118 | int heuristic_method, int num_weights, png_doublep filter_weights, |
| 1119 | png_doublep filter_costs)); |
| 1120 | #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
| 1121 | |
| 1122 | /* Heuristic used for row filter selection. These defines should NOT be |
| 1123 | * changed. |
| 1124 | */ |
| 1125 | #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ |
| 1126 | #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ |
| 1127 | #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ |
| 1128 | #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ |
| 1129 | |
| 1130 | /* Set the library compression level. Currently, valid values range from |
| 1131 | * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 |
| 1132 | * (0 - no compression, 9 - "maximal" compression). Note that tests have |
| 1133 | * shown that zlib compression levels 3-6 usually perform as well as level 9 |
| 1134 | * for PNG images, and do considerably fewer caclulations. In the future, |
| 1135 | * these values may not correspond directly to the zlib compression levels. |
| 1136 | */ |
| 1137 | extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, |
| 1138 | int level)); |
| 1139 | |
| 1140 | extern PNG_EXPORT(void,png_set_compression_mem_level) |
| 1141 | PNGARG((png_structp png_ptr, int mem_level)); |
| 1142 | |
| 1143 | extern PNG_EXPORT(void,png_set_compression_strategy) |
| 1144 | PNGARG((png_structp png_ptr, int strategy)); |
| 1145 | |
| 1146 | extern PNG_EXPORT(void,png_set_compression_window_bits) |
| 1147 | PNGARG((png_structp png_ptr, int window_bits)); |
| 1148 | |
| 1149 | extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, |
| 1150 | int method)); |
| 1151 | |
| 1152 | /* These next functions are called for input/output, memory, and error |
| 1153 | * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, |
| 1154 | * and call standard C I/O routines such as fread(), fwrite(), and |
| 1155 | * fprintf(). These functions can be made to use other I/O routines |
| 1156 | * at run time for those applications that need to handle I/O in a |
| 1157 | * different manner by calling png_set_???_fn(). See libpng.txt for |
| 1158 | * more information. |
| 1159 | */ |
| 1160 | |
| 1161 | #if !defined(PNG_NO_STDIO) |
| 1162 | /* Initialize the input/output for the PNG file to the default functions. */ |
| 1163 | extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, FILE *fp)); |
| 1164 | #endif |
| 1165 | |
| 1166 | /* Replace the (error and abort), and warning functions with user |
| 1167 | * supplied functions. If no messages are to be printed you must still |
| 1168 | * write and use replacement functions. The replacement error_fn should |
| 1169 | * still do a longjmp to the last setjmp location if you are using this |
| 1170 | * method of error handling. If error_fn or warning_fn is NULL, the |
| 1171 | * default function will be used. |
| 1172 | */ |
| 1173 | |
| 1174 | extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, |
| 1175 | png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); |
| 1176 | |
| 1177 | /* Return the user pointer associated with the error functions */ |
| 1178 | extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); |
| 1179 | |
| 1180 | /* Replace the default data output functions with a user supplied one(s). |
| 1181 | * If buffered output is not used, then output_flush_fn can be set to NULL. |
| 1182 | * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time |
| 1183 | * output_flush_fn will be ignored (and thus can be NULL). |
| 1184 | */ |
| 1185 | extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, |
| 1186 | png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); |
| 1187 | |
| 1188 | /* Replace the default data input function with a user supplied one. */ |
| 1189 | extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, |
| 1190 | png_voidp io_ptr, png_rw_ptr read_data_fn)); |
| 1191 | |
| 1192 | /* Return the user pointer associated with the I/O functions */ |
| 1193 | extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); |
| 1194 | |
| 1195 | extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, |
| 1196 | png_read_status_ptr read_row_fn)); |
| 1197 | |
| 1198 | extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, |
| 1199 | png_write_status_ptr write_row_fn)); |
| 1200 | |
| 1201 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1202 | /* Replace the default memory allocation functions with user supplied one(s). */ |
| 1203 | extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, |
| 1204 | png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
| 1205 | |
| 1206 | /* Return the user pointer associated with the memory functions */ |
| 1207 | extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); |
| 1208 | #endif /* PNG_USER_MEM_SUPPORTED */ |
| 1209 | |
| 1210 | #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED |
| 1211 | extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp |
| 1212 | png_ptr, png_user_transform_ptr read_user_transform_fn)); |
| 1213 | #endif |
| 1214 | |
| 1215 | #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED |
| 1216 | extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp |
| 1217 | png_ptr, png_user_transform_ptr write_user_transform_fn)); |
| 1218 | #endif |
| 1219 | |
| 1220 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 1221 | /* Sets the function callbacks for the push reader, and a pointer to a |
| 1222 | * user-defined structure available to the callback functions. |
| 1223 | */ |
| 1224 | extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, |
| 1225 | png_voidp progressive_ptr, |
| 1226 | png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, |
| 1227 | png_progressive_end_ptr end_fn)); |
| 1228 | |
| 1229 | /* returns the user pointer associated with the push read functions */ |
| 1230 | extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) |
| 1231 | PNGARG((png_structp png_ptr)); |
| 1232 | |
| 1233 | /* function to be called when data becomes available */ |
| 1234 | extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, |
| 1235 | png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); |
| 1236 | |
| 1237 | /* function that combines rows. Not very much different than the |
| 1238 | * png_combine_row() call. Is this even used????? |
| 1239 | */ |
| 1240 | extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, |
| 1241 | png_bytep old_row, png_bytep new_row)); |
| 1242 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| 1243 | |
| 1244 | extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, |
| 1245 | png_uint_32 size)); |
| 1246 | |
| 1247 | /* frees a pointer allocated by png_malloc() */ |
| 1248 | extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); |
| 1249 | |
| 1250 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1251 | extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, |
| 1252 | png_uint_32 size)); |
| 1253 | extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, |
| 1254 | png_voidp ptr)); |
| 1255 | #endif /* PNG_USER_MEM_SUPPORTED */ |
| 1256 | |
| 1257 | extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, |
| 1258 | png_voidp s1, png_voidp s2, png_uint_32 size)); |
| 1259 | |
| 1260 | extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, |
| 1261 | png_voidp s1, int value, png_uint_32 size)); |
| 1262 | |
| 1263 | #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ |
| 1264 | extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, |
| 1265 | int check)); |
| 1266 | #endif /* USE_FAR_KEYWORD */ |
| 1267 | |
| 1268 | /* Fatal error in PNG image of libpng - can't continue */ |
| 1269 | extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, |
| 1270 | png_const_charp error)); |
| 1271 | |
| 1272 | /* The same, but the chunk name is prepended to the error string. */ |
| 1273 | extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, |
| 1274 | png_const_charp error)); |
| 1275 | |
| 1276 | /* Non-fatal error in libpng. Can continue, but may have a problem. */ |
| 1277 | extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, |
| 1278 | png_const_charp message)); |
| 1279 | |
| 1280 | /* Non-fatal error in libpng, chunk name is prepended to message. */ |
| 1281 | extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, |
| 1282 | png_const_charp message)); |
| 1283 | |
| 1284 | /* The png_set_<chunk> functions are for storing values in the png_info_struct. |
| 1285 | * Similarly, the png_get_<chunk> calls are used to read values from the |
| 1286 | * png_info_struct, either storing the parameters in the passed variables, or |
| 1287 | * setting pointers into the png_info_struct where the data is stored. The |
| 1288 | * png_get_<chunk> functions return a non-zero value if the data was available |
| 1289 | * in info_ptr, or return zero and do not change any of the parameters if the |
| 1290 | * data was not available. |
| 1291 | * |
| 1292 | * These functions should be used instead of directly accessing png_info |
| 1293 | * to avoid problems with future changes in the size and internal layout of |
| 1294 | * png_info_struct. |
| 1295 | */ |
| 1296 | /* Returns "flag" if chunk data is valid in info_ptr. */ |
| 1297 | extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, |
| 1298 | png_infop info_ptr, png_uint_32 flag)); |
| 1299 | |
| 1300 | /* Returns number of bytes needed to hold a transformed row. */ |
| 1301 | extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, |
| 1302 | png_infop info_ptr)); |
| 1303 | |
| 1304 | /* Returns number of color channels in image. */ |
| 1305 | extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, |
| 1306 | png_infop info_ptr)); |
| 1307 | |
| 1308 | #ifdef PNG_EASY_ACCESS_SUPPORTED |
| 1309 | /* Returns image width in pixels. */ |
| 1310 | extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp |
| 1311 | png_ptr, png_infop info_ptr)); |
| 1312 | |
| 1313 | /* Returns image height in pixels. */ |
| 1314 | extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp |
| 1315 | png_ptr, png_infop info_ptr)); |
| 1316 | |
| 1317 | /* Returns image bit_depth. */ |
| 1318 | extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp |
| 1319 | png_ptr, png_infop info_ptr)); |
| 1320 | |
| 1321 | /* Returns image color_type. */ |
| 1322 | extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp |
| 1323 | png_ptr, png_infop info_ptr)); |
| 1324 | |
| 1325 | /* Returns image filter_type. */ |
| 1326 | extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp |
| 1327 | png_ptr, png_infop info_ptr)); |
| 1328 | |
| 1329 | /* Returns image interlace_type. */ |
| 1330 | extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp |
| 1331 | png_ptr, png_infop info_ptr)); |
| 1332 | |
| 1333 | /* Returns image compression_type. */ |
| 1334 | extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp |
| 1335 | png_ptr, png_infop info_ptr)); |
| 1336 | |
| 1337 | /* Returns image resolution in pixels per meter, from pHYs chunk data. */ |
| 1338 | extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp |
| 1339 | png_ptr, png_infop info_ptr)); |
| 1340 | extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp |
| 1341 | png_ptr, png_infop info_ptr)); |
| 1342 | extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp |
| 1343 | png_ptr, png_infop info_ptr)); |
| 1344 | |
| 1345 | /* Returns pixel aspect ratio, computed from pHYs chunk data. */ |
| 1346 | extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp |
| 1347 | png_ptr, png_infop info_ptr)); |
| 1348 | |
| 1349 | /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ |
| 1350 | extern PNG_EXPORT(png_uint_32, png_get_x_offset_pixels) PNGARG((png_structp |
| 1351 | png_ptr, png_infop info_ptr)); |
| 1352 | extern PNG_EXPORT(png_uint_32, png_get_y_offset_pixels) PNGARG((png_structp |
| 1353 | png_ptr, png_infop info_ptr)); |
| 1354 | extern PNG_EXPORT(png_uint_32, png_get_x_offset_microns) PNGARG((png_structp |
| 1355 | png_ptr, png_infop info_ptr)); |
| 1356 | extern PNG_EXPORT(png_uint_32, png_get_y_offset_microns) PNGARG((png_structp |
| 1357 | png_ptr, png_infop info_ptr)); |
| 1358 | |
| 1359 | #endif /* PNG_EASY_ACCESS_SUPPORTED */ |
| 1360 | |
| 1361 | /* Returns pointer to signature string read from PNG header */ |
| 1362 | extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, |
| 1363 | png_infop info_ptr)); |
| 1364 | |
| 1365 | #if defined(PNG_READ_bKGD_SUPPORTED) |
| 1366 | extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, |
| 1367 | png_infop info_ptr, png_color_16p *background)); |
| 1368 | #endif /* PNG_READ_bKGD_SUPPORTED */ |
| 1369 | |
| 1370 | #if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED) |
| 1371 | extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, |
| 1372 | png_infop info_ptr, png_color_16p background)); |
| 1373 | #endif /* PNG_READ_bKGD_SUPPORTED || PNG_WRITE_bKGD_SUPPORTED */ |
| 1374 | |
| 1375 | #if defined(PNG_READ_cHRM_SUPPORTED) |
| 1376 | extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, |
| 1377 | png_infop info_ptr, double *white_x, double *white_y, double *red_x, |
| 1378 | double *red_y, double *green_x, double *green_y, double *blue_x, |
| 1379 | double *blue_y)); |
| 1380 | #endif /* PNG_READ_cHRM_SUPPORTED */ |
| 1381 | |
| 1382 | #if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED) |
| 1383 | extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, |
| 1384 | png_infop info_ptr, double white_x, double white_y, double red_x, |
| 1385 | double red_y, double green_x, double green_y, double blue_x, double blue_y)); |
| 1386 | #endif /* PNG_READ_cHRM_SUPPORTED || PNG_WRITE_cHRM_SUPPORTED */ |
| 1387 | |
| 1388 | #if defined(PNG_READ_gAMA_SUPPORTED) |
| 1389 | extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, |
| 1390 | png_infop info_ptr, double *file_gamma)); |
| 1391 | #endif /* PNG_READ_gAMA_SUPPORTED */ |
| 1392 | |
| 1393 | #if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED) |
| 1394 | extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, |
| 1395 | png_infop info_ptr, double file_gamma)); |
| 1396 | #endif /* PNG_READ_gAMA_SUPPORTED || PNG_WRITE_gAMA_SUPPORTED */ |
| 1397 | |
| 1398 | #if defined(PNG_READ_hIST_SUPPORTED) |
| 1399 | extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, |
| 1400 | png_infop info_ptr, png_uint_16p *hist)); |
| 1401 | #endif /* PNG_READ_hIST_SUPPORTED */ |
| 1402 | |
| 1403 | #if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED) |
| 1404 | extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, |
| 1405 | png_infop info_ptr, png_uint_16p hist)); |
| 1406 | #endif /* PNG_READ_hIST_SUPPORTED || PNG_WRITE_hIST_SUPPORTED */ |
| 1407 | |
| 1408 | extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, |
| 1409 | png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, |
| 1410 | int *bit_depth, int *color_type, int *interlace_type, |
| 1411 | int *compression_type, int *filter_type)); |
| 1412 | |
| 1413 | extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, |
| 1414 | png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, |
| 1415 | int color_type, int interlace_type, int compression_type, int filter_type)); |
| 1416 | |
| 1417 | #if defined(PNG_READ_oFFs_SUPPORTED) |
| 1418 | extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, |
| 1419 | png_infop info_ptr, png_uint_32 *offset_x, png_uint_32 *offset_y, |
| 1420 | int *unit_type)); |
| 1421 | #endif /* PNG_READ_oFFs_SUPPORTED */ |
| 1422 | |
| 1423 | #if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED) |
| 1424 | extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, |
| 1425 | png_infop info_ptr, png_uint_32 offset_x, png_uint_32 offset_y, |
| 1426 | int unit_type)); |
| 1427 | #endif /* PNG_READ_oFFs_SUPPORTED || PNG_WRITE_oFFs_SUPPORTED */ |
| 1428 | |
| 1429 | #if defined(PNG_READ_pCAL_SUPPORTED) |
| 1430 | extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, |
| 1431 | png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, |
| 1432 | int *type, int *nparams, png_charp *units, png_charpp *params)); |
| 1433 | #endif /* PNG_READ_pCAL_SUPPORTED */ |
| 1434 | |
| 1435 | #if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) |
| 1436 | extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, |
| 1437 | png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, |
| 1438 | int type, int nparams, png_charp units, png_charpp params)); |
| 1439 | #endif /* PNG_READ_pCAL_SUPPORTED || PNG_WRITE_pCAL_SUPPORTED */ |
| 1440 | |
| 1441 | #if defined(PNG_READ_pHYs_SUPPORTED) |
| 1442 | extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, |
| 1443 | png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); |
| 1444 | #endif /* PNG_READ_pHYs_SUPPORTED */ |
| 1445 | |
| 1446 | #if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED) |
| 1447 | extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, |
| 1448 | png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); |
| 1449 | #endif /* PNG_READ_pHYs_SUPPORTED || PNG_WRITE_pHYs_SUPPORTED */ |
| 1450 | |
| 1451 | extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, |
| 1452 | png_infop info_ptr, png_colorp *palette, int *num_palette)); |
| 1453 | |
| 1454 | extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, |
| 1455 | png_infop info_ptr, png_colorp palette, int num_palette)); |
| 1456 | |
| 1457 | #if defined(PNG_READ_sBIT_SUPPORTED) |
| 1458 | extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, |
| 1459 | png_infop info_ptr, png_color_8p *sig_bit)); |
| 1460 | #endif /* PNG_READ_sBIT_SUPPORTED */ |
| 1461 | |
| 1462 | #if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED) |
| 1463 | extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, |
| 1464 | png_infop info_ptr, png_color_8p sig_bit)); |
| 1465 | #endif /* PNG_READ_sBIT_SUPPORTED || PNG_WRITE_sBIT_SUPPORTED */ |
| 1466 | |
| 1467 | #if defined(PNG_READ_sRGB_SUPPORTED) |
| 1468 | extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, |
| 1469 | png_infop info_ptr, int *intent)); |
| 1470 | #endif /* PNG_READ_sRGB_SUPPORTED */ |
| 1471 | |
| 1472 | #if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED) |
| 1473 | extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, |
| 1474 | png_infop info_ptr, int intent)); |
| 1475 | extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, |
| 1476 | png_infop info_ptr, int intent)); |
| 1477 | #endif /* PNG_READ_sRGB_SUPPORTED || PNG_WRITE_sRGB_SUPPORTED */ |
| 1478 | |
| 1479 | #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED) |
| 1480 | /* png_get_text also returns the number of text chunks in text_ptr */ |
| 1481 | extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, |
| 1482 | png_infop info_ptr, png_textp *text_ptr, int *num_text)); |
| 1483 | #endif /* PNG_READ_tEXt_SUPPORTED || PNG_READ_zTXt_SUPPORTED */ |
| 1484 | |
| 1485 | #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \ |
| 1486 | defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) |
| 1487 | extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, |
| 1488 | png_infop info_ptr, png_textp text_ptr, int num_text)); |
| 1489 | #endif /* PNG_READ_OR_WRITE_tEXt_OR_zTXt_SUPPORTED */ |
| 1490 | |
| 1491 | #if defined(PNG_READ_tIME_SUPPORTED) |
| 1492 | extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, |
| 1493 | png_infop info_ptr, png_timep *mod_time)); |
| 1494 | #endif /* PNG_READ_tIME_SUPPORTED */ |
| 1495 | |
| 1496 | #if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED) |
| 1497 | extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, |
| 1498 | png_infop info_ptr, png_timep mod_time)); |
| 1499 | #endif /* PNG_READ_tIME_SUPPORTED || PNG_WRITE_tIME_SUPPORTED */ |
| 1500 | |
| 1501 | #if defined(PNG_READ_tRNS_SUPPORTED) |
| 1502 | extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, |
| 1503 | png_infop info_ptr, png_bytep *trans, int *num_trans, |
| 1504 | png_color_16p *trans_values)); |
| 1505 | #endif /* PNG_READ_tRNS_SUPPORTED */ |
| 1506 | |
| 1507 | #if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED) |
| 1508 | extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, |
| 1509 | png_infop info_ptr, png_bytep trans, int num_trans, |
| 1510 | png_color_16p trans_values)); |
| 1511 | #endif /* PNG_READ_tRNS_SUPPORTED || PNG_WRITE_tRNS_SUPPORTED */ |
| 1512 | |
| 1513 | /* Define PNG_DEBUG at compile time for debugging information. Higher |
| 1514 | * numbers for PNG_DEBUG mean more debugging information. This has |
| 1515 | * only been added since version 0.95 so it is not implemented throughout |
| 1516 | * libpng yet, but more support will be added as needed. |
| 1517 | */ |
| 1518 | #ifdef PNG_DEBUG |
| 1519 | #if (PNG_DEBUG > 0) |
| 1520 | #ifndef PNG_DEBUG_FILE |
| 1521 | #define PNG_DEBUG_FILE stderr |
| 1522 | #endif /* PNG_DEBUG_FILE */ |
| 1523 | |
| 1524 | #define png_debug(l,m) if (PNG_DEBUG > l) \ |
| 1525 | fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \ |
| 1526 | (l==2 ? "\t\t":(l>2 ? "\t\t\t":"")))) |
| 1527 | #define png_debug1(l,m,p1) if (PNG_DEBUG > l) \ |
| 1528 | fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \ |
| 1529 | (l==2 ? "\t\t":(l>2 ? "\t\t\t":""))),p1) |
| 1530 | #define png_debug2(l,m,p1,p2) if (PNG_DEBUG > l) \ |
| 1531 | fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \ |
| 1532 | (l==2 ? "\t\t":(l>2 ? "\t\t\t":""))),p1,p2) |
| 1533 | #endif /* (PNG_DEBUG > 0) */ |
| 1534 | #endif /* PNG_DEBUG */ |
| 1535 | #ifndef png_debug |
| 1536 | #define png_debug(l, m) |
| 1537 | #endif |
| 1538 | #ifndef png_debug1 |
| 1539 | #define png_debug1(l, m, p1) |
| 1540 | #endif |
| 1541 | #ifndef png_debug2 |
| 1542 | #define png_debug2(l, m, p1, p2) |
| 1543 | #endif |
| 1544 | |
| 1545 | extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); |
| 1546 | extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); |
| 1547 | |
| 1548 | #ifdef PNG_NO_EXTERN |
| 1549 | /* this only gets included in png.c */ |
| 1550 | png_charp |
| 1551 | png_get_header_version(png_structp png_ptr) |
| 1552 | { |
| 1553 | if(png_ptr == NULL) |
| 1554 | /* silence compiler warning about unused png_ptr */ ; |
| 1555 | return("\n libpng version 1.0.3 - January 14, 1999 (header)\n"); |
| 1556 | } |
| 1557 | #endif |
| 1558 | |
| 1559 | #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED |
| 1560 | /* With these routines we avoid an integer divide, which will be slower on |
| 1561 | * most machines. However, it does take more operations than the corresponding |
| 1562 | * divide method, so it may be slower on a few RISC systems. There are two |
| 1563 | * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. |
| 1564 | * |
| 1565 | * Note that the rounding factors are NOT supposed to be the same! 128 and |
| 1566 | * 32768 are correct for the NODIV code; 127 and 32767 are correct for the |
| 1567 | * standard method. |
| 1568 | * |
| 1569 | * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] |
| 1570 | */ |
| 1571 | |
| 1572 | /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ |
| 1573 | |
| 1574 | # define png_composite(composite, fg, alpha, bg) \ |
| 1575 | { png_uint_16 temp = ((png_uint_16)(fg) * (png_uint_16)(alpha) + \ |
| 1576 | (png_uint_16)(bg)*(png_uint_16)(255 - \ |
| 1577 | (png_uint_16)(alpha)) + (png_uint_16)128); \ |
| 1578 | (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } |
| 1579 | |
| 1580 | # define png_composite_16(composite, fg, alpha, bg) \ |
| 1581 | { png_uint_32 temp = ((png_uint_32)(fg) * (png_uint_32)(alpha) + \ |
| 1582 | (png_uint_32)(bg)*(png_uint_32)(65535L - \ |
| 1583 | (png_uint_32)(alpha)) + (png_uint_32)32768L); \ |
| 1584 | (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } |
| 1585 | |
| 1586 | #else /* standard method using integer division */ |
| 1587 | |
| 1588 | # define png_composite(composite, fg, alpha, bg) \ |
| 1589 | (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ |
| 1590 | (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ |
| 1591 | (png_uint_16)127) / 255) |
| 1592 | |
| 1593 | # define png_composite_16(composite, fg, alpha, bg) \ |
| 1594 | (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ |
| 1595 | (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ |
| 1596 | (png_uint_32)32767) / (png_uint_32)65535L) |
| 1597 | |
| 1598 | #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ |
| 1599 | |
| 1600 | /* These next functions are used internally in the code. They generally |
| 1601 | * shouldn't be used unless you are writing code to add or replace some |
| 1602 | * functionality in libpng. More information about most functions can |
| 1603 | * be found in the files where the functions are located. |
| 1604 | */ |
| 1605 | |
| 1606 | #if defined(PNG_INTERNAL) |
| 1607 | |
| 1608 | /* Various modes of operation. Note that after an init, mode is set to |
| 1609 | * zero automatically when the structure is created. |
| 1610 | */ |
| 1611 | #define PNG_BEFORE_IHDR 0x00 |
| 1612 | #define PNG_HAVE_IHDR 0x01 |
| 1613 | #define PNG_HAVE_PLTE 0x02 |
| 1614 | #define PNG_HAVE_IDAT 0x04 |
| 1615 | #define PNG_AFTER_IDAT 0x08 |
| 1616 | #define PNG_HAVE_IEND 0x10 |
| 1617 | #define PNG_HAVE_gAMA 0x20 |
| 1618 | #define PNG_HAVE_cHRM 0x40 |
| 1619 | #define PNG_HAVE_sRGB 0x80 |
| 1620 | |
| 1621 | /* push model modes */ |
| 1622 | #define PNG_READ_SIG_MODE 0 |
| 1623 | #define PNG_READ_CHUNK_MODE 1 |
| 1624 | #define PNG_READ_IDAT_MODE 2 |
| 1625 | #define PNG_SKIP_MODE 3 |
| 1626 | #define PNG_READ_tEXt_MODE 4 |
| 1627 | #define PNG_READ_zTXt_MODE 5 |
| 1628 | #define PNG_READ_DONE_MODE 6 |
| 1629 | #define PNG_ERROR_MODE 7 |
| 1630 | |
| 1631 | /* flags for the transformations the PNG library does on the image data */ |
| 1632 | #define PNG_BGR 0x0001 |
| 1633 | #define PNG_INTERLACE 0x0002 |
| 1634 | #define PNG_PACK 0x0004 |
| 1635 | #define PNG_SHIFT 0x0008 |
| 1636 | #define PNG_SWAP_BYTES 0x0010 |
| 1637 | #define PNG_INVERT_MONO 0x0020 |
| 1638 | #define PNG_DITHER 0x0040 |
| 1639 | #define PNG_BACKGROUND 0x0080 |
| 1640 | #define PNG_BACKGROUND_EXPAND 0x0100 |
| 1641 | /* 0x0200 unused */ |
| 1642 | #define PNG_16_TO_8 0x0400 |
| 1643 | #define PNG_RGBA 0x0800 |
| 1644 | #define PNG_EXPAND 0x1000 |
| 1645 | #define PNG_GAMMA 0x2000 |
| 1646 | #define PNG_GRAY_TO_RGB 0x4000 |
| 1647 | #define PNG_FILLER 0x8000 |
| 1648 | #define PNG_PACKSWAP 0x10000L |
| 1649 | #define PNG_SWAP_ALPHA 0x20000L |
| 1650 | #define PNG_STRIP_ALPHA 0x40000L |
| 1651 | #define PNG_INVERT_ALPHA 0x80000L |
| 1652 | #define PNG_USER_TRANSFORM 0x100000L |
| 1653 | #define PNG_RGB_TO_GRAY_ERR 0x200000L |
| 1654 | #define PNG_RGB_TO_GRAY_WARN 0x400000L |
| 1655 | #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ |
| 1656 | |
| 1657 | /* flags for png_create_struct */ |
| 1658 | #define PNG_STRUCT_PNG 0x0001 |
| 1659 | #define PNG_STRUCT_INFO 0x0002 |
| 1660 | |
| 1661 | /* Scaling factor for filter heuristic weighting calculations */ |
| 1662 | #define PNG_WEIGHT_SHIFT 8 |
| 1663 | #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) |
| 1664 | #define PNG_COST_SHIFT 3 |
| 1665 | #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) |
| 1666 | |
| 1667 | /* flags for the png_ptr->flags rather than declaring a byte for each one */ |
| 1668 | #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 |
| 1669 | #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 |
| 1670 | #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 |
| 1671 | #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 |
| 1672 | #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 |
| 1673 | #define PNG_FLAG_ZLIB_FINISHED 0x0020 |
| 1674 | #define PNG_FLAG_ROW_INIT 0x0040 |
| 1675 | #define PNG_FLAG_FILLER_AFTER 0x0080 |
| 1676 | #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 |
| 1677 | #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 |
| 1678 | #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 |
| 1679 | #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 |
| 1680 | #define PNG_FLAG_FREE_PALETTE 0x1000 |
| 1681 | #define PNG_FLAG_FREE_TRANS 0x2000 |
| 1682 | #define PNG_FLAG_FREE_HIST 0x4000 |
| 1683 | #define PNG_FLAG_HAVE_CHUNK_HEADER 0x8000L |
| 1684 | #define PNG_FLAG_WROTE_tIME 0x10000L |
| 1685 | #define PNG_FLAG_BACKGROUND_IS_GRAY 0x20000L |
| 1686 | |
| 1687 | #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ |
| 1688 | PNG_FLAG_CRC_ANCILLARY_NOWARN) |
| 1689 | |
| 1690 | #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ |
| 1691 | PNG_FLAG_CRC_CRITICAL_IGNORE) |
| 1692 | |
| 1693 | #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ |
| 1694 | PNG_FLAG_CRC_CRITICAL_MASK) |
| 1695 | |
| 1696 | /* save typing and make code easier to understand */ |
| 1697 | #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ |
| 1698 | abs((int)((c1).green) - (int)((c2).green)) + \ |
| 1699 | abs((int)((c1).blue) - (int)((c2).blue))) |
| 1700 | |
| 1701 | /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ |
| 1702 | #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) |
| 1703 | /* place to hold the signature string for a PNG file. */ |
| 1704 | extern png_byte FARDATA png_sig[8]; |
| 1705 | |
| 1706 | /* Constant strings for known chunk types. If you need to add a chunk, |
| 1707 | * add a string holding the name here. See png.c for more details. We |
| 1708 | * can't selectively include these, since we still check for chunk in the |
| 1709 | * wrong locations with these labels. |
| 1710 | */ |
| 1711 | extern png_byte FARDATA png_IHDR[5]; |
| 1712 | extern png_byte FARDATA png_IDAT[5]; |
| 1713 | extern png_byte FARDATA png_IEND[5]; |
| 1714 | extern png_byte FARDATA png_PLTE[5]; |
| 1715 | extern png_byte FARDATA png_bKGD[5]; |
| 1716 | extern png_byte FARDATA png_cHRM[5]; |
| 1717 | extern png_byte FARDATA png_gAMA[5]; |
| 1718 | extern png_byte FARDATA png_hIST[5]; |
| 1719 | extern png_byte FARDATA png_oFFs[5]; |
| 1720 | extern png_byte FARDATA png_pCAL[5]; |
| 1721 | extern png_byte FARDATA png_pHYs[5]; |
| 1722 | extern png_byte FARDATA png_sBIT[5]; |
| 1723 | extern png_byte FARDATA png_sRGB[5]; |
| 1724 | extern png_byte FARDATA png_tEXt[5]; |
| 1725 | extern png_byte FARDATA png_tIME[5]; |
| 1726 | extern png_byte FARDATA png_tRNS[5]; |
| 1727 | extern png_byte FARDATA png_zTXt[5]; |
| 1728 | |
| 1729 | #endif /* PNG_NO_EXTERN */ |
| 1730 | |
| 1731 | /* Inline macros to do direct reads of bytes from the input buffer. These |
| 1732 | * require that you are using an architecture that uses PNG byte ordering |
| 1733 | * (MSB first) and supports unaligned data storage. I think that PowerPC |
| 1734 | * in big-endian mode and 680x0 are the only ones that will support this. |
| 1735 | * The x86 line of processors definitely do not. The png_get_int_32() |
| 1736 | * routine also assumes we are using two's complement format for negative |
| 1737 | * values, which is almost certainly true. |
| 1738 | */ |
| 1739 | #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED) |
| 1740 | #if defined(PNG_READ_pCAL_SUPPORTED) |
| 1741 | #define png_get_int_32(buf) ( *((png_int_32p) (buf))) |
| 1742 | #endif /* PNG_READ_pCAL_SUPPORTED */ |
| 1743 | #define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) |
| 1744 | #define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) |
| 1745 | #else |
| 1746 | #if defined(PNG_READ_pCAL_SUPPORTED) |
| 1747 | PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf)); |
| 1748 | #endif /* PNG_READ_pCAL_SUPPORTED */ |
| 1749 | PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf)); |
| 1750 | PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf)); |
| 1751 | #endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */ |
| 1752 | |
| 1753 | /* Initialize png_ptr struct for reading, and allocate any other memory. |
| 1754 | * (old interface - NOT DLL EXPORTED). |
| 1755 | */ |
| 1756 | extern void png_read_init PNGARG((png_structp png_ptr)); |
| 1757 | |
| 1758 | /* Initialize png_ptr struct for writing, and allocate any other memory. |
| 1759 | * (old interface - NOT DLL EXPORTED). |
| 1760 | */ |
| 1761 | extern void png_write_init PNGARG((png_structp png_ptr)); |
| 1762 | |
| 1763 | /* allocate memory for an internal libpng struct */ |
| 1764 | PNG_EXTERN png_voidp png_create_struct PNGARG((int type)); |
| 1765 | |
| 1766 | /* free memory from internal libpng struct */ |
| 1767 | PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); |
| 1768 | |
| 1769 | PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr |
| 1770 | malloc_fn)); |
| 1771 | PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, |
| 1772 | png_free_ptr free_fn)); |
| 1773 | |
| 1774 | /* free any memory that info_ptr points to and reset struct. */ |
| 1775 | PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, |
| 1776 | png_infop info_ptr)); |
| 1777 | |
| 1778 | /* Function to allocate memory for zlib. */ |
| 1779 | PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size)); |
| 1780 | |
| 1781 | /* function to free memory for zlib */ |
| 1782 | PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); |
| 1783 | |
| 1784 | /* reset the CRC variable */ |
| 1785 | PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); |
| 1786 | |
| 1787 | /* Write the "data" buffer to whatever output you are using. */ |
| 1788 | PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, |
| 1789 | png_size_t length)); |
| 1790 | |
| 1791 | /* Read data from whatever input you are using into the "data" buffer */ |
| 1792 | PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, |
| 1793 | png_size_t length)); |
| 1794 | |
| 1795 | /* read bytes into buf, and update png_ptr->crc */ |
| 1796 | PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, |
| 1797 | png_size_t length)); |
| 1798 | |
| 1799 | /* read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ |
| 1800 | PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); |
| 1801 | |
| 1802 | /* read the CRC from the file and compare it to the libpng calculated CRC */ |
| 1803 | PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); |
| 1804 | |
| 1805 | /* Calculate the CRC over a section of data. Note that we are only |
| 1806 | * passing a maximum of 64K on systems that have this as a memory limit, |
| 1807 | * since this is the maximum buffer size we can specify. |
| 1808 | */ |
| 1809 | PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, |
| 1810 | png_size_t length)); |
| 1811 | |
| 1812 | #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
| 1813 | PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); |
| 1814 | #endif |
| 1815 | |
| 1816 | /* Place a 32-bit number into a buffer in PNG byte order (big-endian). |
| 1817 | * The only currently known PNG chunks that use signed numbers are |
| 1818 | * the ancillary extension chunks, oFFs and pCAL. |
| 1819 | */ |
| 1820 | PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i)); |
| 1821 | |
| 1822 | #if defined(PNG_WRITE_pCAL_SUPPORTED) |
| 1823 | PNG_EXTERN void png_save_int_32 PNGARG((png_bytep buf, png_int_32 i)); |
| 1824 | #endif |
| 1825 | |
| 1826 | /* Place a 16 bit number into a buffer in PNG byte order. |
| 1827 | * The parameter is declared unsigned int, not png_uint_16, |
| 1828 | * just to avoid potential problems on pre-ANSI C compilers. |
| 1829 | */ |
| 1830 | PNG_EXTERN void png_save_uint_16 PNGARG((png_bytep buf, unsigned int i)); |
| 1831 | |
| 1832 | /* simple function to write the signature */ |
| 1833 | PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)); |
| 1834 | |
| 1835 | /* write various chunks */ |
| 1836 | |
| 1837 | /* Write the IHDR chunk, and update the png_struct with the necessary |
| 1838 | * information. |
| 1839 | */ |
| 1840 | PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, |
| 1841 | png_uint_32 height, |
| 1842 | int bit_depth, int color_type, int compression_type, int filter_type, |
| 1843 | int interlace_type)); |
| 1844 | |
| 1845 | PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, |
| 1846 | png_uint_32 num_pal)); |
| 1847 | |
| 1848 | PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, |
| 1849 | png_size_t length)); |
| 1850 | |
| 1851 | PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); |
| 1852 | |
| 1853 | #if defined(PNG_WRITE_gAMA_SUPPORTED) |
| 1854 | PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); |
| 1855 | #endif |
| 1856 | |
| 1857 | #if defined(PNG_WRITE_sBIT_SUPPORTED) |
| 1858 | PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, |
| 1859 | int color_type)); |
| 1860 | #endif |
| 1861 | |
| 1862 | #if defined(PNG_WRITE_cHRM_SUPPORTED) |
| 1863 | PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, |
| 1864 | double white_x, double white_y, |
| 1865 | double red_x, double red_y, double green_x, double green_y, |
| 1866 | double blue_x, double blue_y)); |
| 1867 | #endif |
| 1868 | |
| 1869 | #if defined(PNG_WRITE_sRGB_SUPPORTED) |
| 1870 | PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, |
| 1871 | int intent)); |
| 1872 | #endif |
| 1873 | |
| 1874 | #if defined(PNG_WRITE_tRNS_SUPPORTED) |
| 1875 | PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, |
| 1876 | png_color_16p values, int number, int color_type)); |
| 1877 | #endif |
| 1878 | |
| 1879 | #if defined(PNG_WRITE_bKGD_SUPPORTED) |
| 1880 | PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, |
| 1881 | png_color_16p values, int color_type)); |
| 1882 | #endif |
| 1883 | |
| 1884 | #if defined(PNG_WRITE_hIST_SUPPORTED) |
| 1885 | PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, |
| 1886 | int num_hist)); |
| 1887 | #endif |
| 1888 | |
| 1889 | #if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) || \ |
| 1890 | defined(PNG_WRITE_pCAL_SUPPORTED) |
| 1891 | PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, |
| 1892 | png_charp key, png_charpp new_key)); |
| 1893 | #endif |
| 1894 | |
| 1895 | #if defined(PNG_WRITE_tEXt_SUPPORTED) |
| 1896 | PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, |
| 1897 | png_charp text, png_size_t text_len)); |
| 1898 | #endif |
| 1899 | |
| 1900 | #if defined(PNG_WRITE_zTXt_SUPPORTED) |
| 1901 | PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, |
| 1902 | png_charp text, png_size_t text_len, int compression)); |
| 1903 | #endif |
| 1904 | |
| 1905 | #if defined(PNG_WRITE_oFFs_SUPPORTED) |
| 1906 | PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, |
| 1907 | png_uint_32 x_offset, png_uint_32 y_offset, int unit_type)); |
| 1908 | #endif |
| 1909 | |
| 1910 | #if defined(PNG_WRITE_pCAL_SUPPORTED) |
| 1911 | PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, |
| 1912 | png_int_32 X0, png_int_32 X1, int type, int nparams, |
| 1913 | png_charp units, png_charpp params)); |
| 1914 | #endif |
| 1915 | |
| 1916 | #if defined(PNG_WRITE_pHYs_SUPPORTED) |
| 1917 | PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, |
| 1918 | png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, |
| 1919 | int unit_type)); |
| 1920 | #endif |
| 1921 | |
| 1922 | #if defined(PNG_WRITE_tIME_SUPPORTED) |
| 1923 | PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, |
| 1924 | png_timep mod_time)); |
| 1925 | #endif |
| 1926 | |
| 1927 | /* Called when finished processing a row of data */ |
| 1928 | PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); |
| 1929 | |
| 1930 | /* Internal use only. Called before first row of data */ |
| 1931 | PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); |
| 1932 | |
| 1933 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
| 1934 | PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)); |
| 1935 | #endif |
| 1936 | |
| 1937 | /* combine a row of data, dealing with alpha, etc. if requested */ |
| 1938 | PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, |
| 1939 | int mask)); |
| 1940 | |
| 1941 | #if defined(PNG_READ_INTERLACING_SUPPORTED) |
| 1942 | /* expand an interlaced row */ |
| 1943 | PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, |
| 1944 | png_bytep row, int pass, png_uint_32 transformations)); |
| 1945 | #endif |
| 1946 | |
| 1947 | #if defined(PNG_WRITE_INTERLACING_SUPPORTED) |
| 1948 | /* grab pixels out of a row for an interlaced pass */ |
| 1949 | PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, |
| 1950 | png_bytep row, int pass)); |
| 1951 | #endif |
| 1952 | |
| 1953 | /* unfilter a row */ |
| 1954 | PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, |
| 1955 | png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter)); |
| 1956 | |
| 1957 | /* Choose the best filter to use and filter the row data */ |
| 1958 | PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, |
| 1959 | png_row_infop row_info)); |
| 1960 | |
| 1961 | /* Write out the filtered row. */ |
| 1962 | PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, |
| 1963 | png_bytep filtered_row)); |
| 1964 | /* finish a row while reading, dealing with interlacing passes, etc. */ |
| 1965 | PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); |
| 1966 | |
| 1967 | /* initialize the row buffers, etc. */ |
| 1968 | PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); |
| 1969 | /* optional call to update the users info structure */ |
| 1970 | PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, |
| 1971 | png_infop info_ptr)); |
| 1972 | |
| 1973 | /* these are the functions that do the transformations */ |
| 1974 | #if defined(PNG_READ_FILLER_SUPPORTED) |
| 1975 | PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, |
| 1976 | png_bytep row, png_uint_32 filler, png_uint_32 flags)); |
| 1977 | #endif |
| 1978 | |
| 1979 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) |
| 1980 | PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, |
| 1981 | png_bytep row)); |
| 1982 | #endif |
| 1983 | |
| 1984 | #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
| 1985 | PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, |
| 1986 | png_bytep row)); |
| 1987 | #endif |
| 1988 | |
| 1989 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) |
| 1990 | PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, |
| 1991 | png_bytep row)); |
| 1992 | #endif |
| 1993 | |
| 1994 | #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
| 1995 | PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, |
| 1996 | png_bytep row)); |
| 1997 | #endif |
| 1998 | |
| 1999 | #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ |
| 2000 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
| 2001 | PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, |
| 2002 | png_bytep row, png_uint_32 flags)); |
| 2003 | #endif |
| 2004 | |
| 2005 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
| 2006 | PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); |
| 2007 | #endif |
| 2008 | |
| 2009 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
| 2010 | PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); |
| 2011 | #endif |
| 2012 | |
| 2013 | #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
| 2014 | PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop |
| 2015 | row_info, png_bytep row)); |
| 2016 | #endif |
| 2017 | |
| 2018 | #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) |
| 2019 | PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, |
| 2020 | png_bytep row)); |
| 2021 | #endif |
| 2022 | |
| 2023 | #if defined(PNG_READ_PACK_SUPPORTED) |
| 2024 | PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row)); |
| 2025 | #endif |
| 2026 | |
| 2027 | #if defined(PNG_READ_SHIFT_SUPPORTED) |
| 2028 | PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, |
| 2029 | png_color_8p sig_bits)); |
| 2030 | #endif |
| 2031 | |
| 2032 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
| 2033 | PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); |
| 2034 | #endif |
| 2035 | |
| 2036 | #if defined(PNG_READ_16_TO_8_SUPPORTED) |
| 2037 | PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); |
| 2038 | #endif |
| 2039 | |
| 2040 | #if defined(PNG_READ_DITHER_SUPPORTED) |
| 2041 | PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, |
| 2042 | png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup)); |
| 2043 | |
| 2044 | # if defined(PNG_CORRECT_PALETTE_SUPPORTED) |
| 2045 | PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, |
| 2046 | png_colorp palette, int num_palette)); |
| 2047 | # endif |
| 2048 | #endif |
| 2049 | |
| 2050 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
| 2051 | PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row)); |
| 2052 | #endif |
| 2053 | |
| 2054 | #if defined(PNG_WRITE_PACK_SUPPORTED) |
| 2055 | PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, |
| 2056 | png_bytep row, png_uint_32 bit_depth)); |
| 2057 | #endif |
| 2058 | |
| 2059 | #if defined(PNG_WRITE_SHIFT_SUPPORTED) |
| 2060 | PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, |
| 2061 | png_color_8p bit_depth)); |
| 2062 | #endif |
| 2063 | |
| 2064 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 2065 | PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, |
| 2066 | png_color_16p trans_values, png_color_16p background, |
| 2067 | png_color_16p background_1, |
| 2068 | png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, |
| 2069 | png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, |
| 2070 | png_uint_16pp gamma_16_to_1, int gamma_shift)); |
| 2071 | #endif |
| 2072 | |
| 2073 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
| 2074 | PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, |
| 2075 | png_bytep gamma_table, png_uint_16pp gamma_16_table, |
| 2076 | int gamma_shift)); |
| 2077 | #endif |
| 2078 | |
| 2079 | #if defined(PNG_READ_EXPAND_SUPPORTED) |
| 2080 | PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, |
| 2081 | png_bytep row, png_colorp palette, png_bytep trans, int num_trans)); |
| 2082 | PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, |
| 2083 | png_bytep row, png_color_16p trans_value)); |
| 2084 | #endif |
| 2085 | |
| 2086 | /* The following decodes the appropriate chunks, and does error correction, |
| 2087 | * then calls the appropriate callback for the chunk if it is valid. |
| 2088 | */ |
| 2089 | |
| 2090 | /* decode the IHDR chunk */ |
| 2091 | PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2092 | png_uint_32 length)); |
| 2093 | PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2094 | png_uint_32 length)); |
| 2095 | PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2096 | png_uint_32 length)); |
| 2097 | |
| 2098 | #if defined(PNG_READ_gAMA_SUPPORTED) |
| 2099 | PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2100 | png_uint_32 length)); |
| 2101 | #endif |
| 2102 | |
| 2103 | #if defined(PNG_READ_sBIT_SUPPORTED) |
| 2104 | PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2105 | png_uint_32 length)); |
| 2106 | #endif |
| 2107 | |
| 2108 | #if defined(PNG_READ_cHRM_SUPPORTED) |
| 2109 | PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2110 | png_uint_32 length)); |
| 2111 | #endif |
| 2112 | |
| 2113 | #if defined(PNG_READ_sRGB_SUPPORTED) |
| 2114 | PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2115 | png_uint_32 length)); |
| 2116 | #endif |
| 2117 | |
| 2118 | #if defined(PNG_READ_tRNS_SUPPORTED) |
| 2119 | PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2120 | png_uint_32 length)); |
| 2121 | #endif |
| 2122 | |
| 2123 | #if defined(PNG_READ_bKGD_SUPPORTED) |
| 2124 | PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2125 | png_uint_32 length)); |
| 2126 | #endif |
| 2127 | |
| 2128 | #if defined(PNG_READ_hIST_SUPPORTED) |
| 2129 | PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2130 | png_uint_32 length)); |
| 2131 | #endif |
| 2132 | |
| 2133 | #if defined(PNG_READ_oFFs_SUPPORTED) |
| 2134 | PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2135 | png_uint_32 length)); |
| 2136 | #endif |
| 2137 | |
| 2138 | #if defined(PNG_READ_pCAL_SUPPORTED) |
| 2139 | PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2140 | png_uint_32 length)); |
| 2141 | #endif |
| 2142 | |
| 2143 | #if defined(PNG_READ_pHYs_SUPPORTED) |
| 2144 | PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2145 | png_uint_32 length)); |
| 2146 | #endif |
| 2147 | |
| 2148 | #if defined(PNG_READ_tIME_SUPPORTED) |
| 2149 | PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2150 | png_uint_32 length)); |
| 2151 | #endif |
| 2152 | |
| 2153 | #if defined(PNG_READ_tEXt_SUPPORTED) |
| 2154 | PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2155 | png_uint_32 length)); |
| 2156 | #endif |
| 2157 | |
| 2158 | #if defined(PNG_READ_zTXt_SUPPORTED) |
| 2159 | PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 2160 | png_uint_32 length)); |
| 2161 | #endif |
| 2162 | |
| 2163 | PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, |
| 2164 | png_infop info_ptr, png_uint_32 length)); |
| 2165 | |
| 2166 | PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, |
| 2167 | png_bytep chunk_name)); |
| 2168 | |
| 2169 | /* handle the transformations for reading and writing */ |
| 2170 | PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); |
| 2171 | PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); |
| 2172 | |
| 2173 | PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); |
| 2174 | |
| 2175 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 2176 | PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, |
| 2177 | png_infop info_ptr)); |
| 2178 | PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, |
| 2179 | png_infop info_ptr)); |
| 2180 | PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); |
| 2181 | PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, |
| 2182 | png_uint_32 length)); |
| 2183 | PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); |
| 2184 | PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, |
| 2185 | png_bytep buffer, png_size_t length)); |
| 2186 | PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); |
| 2187 | PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, |
| 2188 | png_bytep buffer, png_size_t buffer_length)); |
| 2189 | PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); |
| 2190 | PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, |
| 2191 | png_bytep buffer, png_size_t buffer_length)); |
| 2192 | PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); |
| 2193 | PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, |
| 2194 | png_infop info_ptr, png_uint_32 length)); |
| 2195 | PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, |
| 2196 | png_infop info_ptr)); |
| 2197 | PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, |
| 2198 | png_infop info_ptr)); |
| 2199 | PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); |
| 2200 | PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, |
| 2201 | png_infop info_ptr)); |
| 2202 | PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, |
| 2203 | png_infop info_ptr)); |
| 2204 | PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); |
| 2205 | #if defined(PNG_READ_tEXt_SUPPORTED) |
| 2206 | PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, |
| 2207 | png_infop info_ptr, png_uint_32 length)); |
| 2208 | PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, |
| 2209 | png_infop info_ptr)); |
| 2210 | #endif |
| 2211 | #if defined(PNG_READ_zTXt_SUPPORTED) |
| 2212 | PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, |
| 2213 | png_infop info_ptr, png_uint_32 length)); |
| 2214 | PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, |
| 2215 | png_infop info_ptr)); |
| 2216 | #endif |
| 2217 | |
| 2218 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| 2219 | |
| 2220 | #endif /* PNG_INTERNAL */ |
| 2221 | |
| 2222 | #ifdef __cplusplus |
| 2223 | } |
| 2224 | #endif |
| 2225 | |
| 2226 | /* do not put anything past this line */ |
| 2227 | #endif /* _PNG_H */ |