2 /* pngpriv.h - private declarations for use inside libpng
4 * libpng version 1.4.4 - September 23, 2010
5 * For conditions of distribution and use, see copyright notice in png.h
6 * Copyright (c) 1998-2010 Glenn Randers-Pehrson
7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
10 * This code is released under the libpng license.
11 * For conditions of distribution and use, see the disclaimer
12 * and license in png.h
15 /* The symbols declared in this file (including the functions declared
16 * as PNG_EXTERN) are PRIVATE. They are not part of the libpng public
17 * interface, and are not recommended for use by regular applications.
18 * Some of them may become public in the future; others may stay private,
19 * change in an incompatible way, or even disappear.
20 * Although the libpng users are not forbidden to include this header,
21 * they should be well aware of the issues that may arise from doing so.
27 #ifndef PNG_VERSION_INFO_ONLY
32 /* The functions exported by PNG_EXTERN are internal functions, which
33 * aren't usually used outside the library (as far as I know), so it is
34 * debatable if they should be exported at all. In the future, when it
35 * is possible to have run-time registry of chunk-handling functions,
36 * some of these will be made available again.
37 # define PNG_EXTERN extern
42 /* Other defines specific to compilers can go here. Try to keep
43 * them inside an appropriate ifdef/endif pair for portability.
46 #ifdef PNG_FLOATING_POINT_SUPPORTED
48 /* We need to check that <math.h> hasn't already been included earlier
49 * as it seems it doesn't agree with <fp.h>, yet we should really use
52 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
58 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
59 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
66 /* Codewarrior on NT has linking problems without this. */
67 #if (defined(__MWERKS__) && defined(WIN32)) || defined(__STDC__)
68 # define PNG_ALWAYS_EXTERN
71 /* This provides the non-ANSI (far) memory allocation routines. */
72 #if defined(__TURBOC__) && defined(__MSDOS__)
77 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
78 defined(_WIN32) || defined(__WIN32__)
79 # include <windows.h> /* defines _WINDOWS_ macro */
82 /* Various modes of operation. Note that after an init, mode is set to
83 * zero automatically when the structure is created.
85 #define PNG_HAVE_IHDR 0x01
86 #define PNG_HAVE_PLTE 0x02
87 #define PNG_HAVE_IDAT 0x04
88 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
89 #define PNG_HAVE_IEND 0x10
90 #define PNG_HAVE_gAMA 0x20
91 #define PNG_HAVE_cHRM 0x40
92 #define PNG_HAVE_sRGB 0x80
93 #define PNG_HAVE_CHUNK_HEADER 0x100
94 #define PNG_WROTE_tIME 0x200
95 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
96 #define PNG_BACKGROUND_IS_GRAY 0x800
97 #define PNG_HAVE_PNG_SIGNATURE 0x1000
98 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
100 /* Flags for the transformations the PNG library does on the image data */
101 #define PNG_BGR 0x0001
102 #define PNG_INTERLACE 0x0002
103 #define PNG_PACK 0x0004
104 #define PNG_SHIFT 0x0008
105 #define PNG_SWAP_BYTES 0x0010
106 #define PNG_INVERT_MONO 0x0020
107 #define PNG_QUANTIZE 0x0040 /* formerly PNG_DITHER */
108 #define PNG_BACKGROUND 0x0080
109 #define PNG_BACKGROUND_EXPAND 0x0100
111 #define PNG_16_TO_8 0x0400
112 #define PNG_RGBA 0x0800
113 #define PNG_EXPAND 0x1000
114 #define PNG_GAMMA 0x2000
115 #define PNG_GRAY_TO_RGB 0x4000
116 #define PNG_FILLER 0x8000L
117 #define PNG_PACKSWAP 0x10000L
118 #define PNG_SWAP_ALPHA 0x20000L
119 #define PNG_STRIP_ALPHA 0x40000L
120 #define PNG_INVERT_ALPHA 0x80000L
121 #define PNG_USER_TRANSFORM 0x100000L
122 #define PNG_RGB_TO_GRAY_ERR 0x200000L
123 #define PNG_RGB_TO_GRAY_WARN 0x400000L
124 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
125 /* 0x800000L Unused */
126 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
127 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
128 /* 0x4000000L unused */
129 /* 0x8000000L unused */
130 /* 0x10000000L unused */
131 /* 0x20000000L unused */
132 /* 0x40000000L unused */
134 /* Flags for png_create_struct */
135 #define PNG_STRUCT_PNG 0x0001
136 #define PNG_STRUCT_INFO 0x0002
138 /* Scaling factor for filter heuristic weighting calculations */
139 #define PNG_WEIGHT_SHIFT 8
140 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
141 #define PNG_COST_SHIFT 3
142 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
144 /* Flags for the png_ptr->flags rather than declaring a byte for each one */
145 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
146 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
147 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
148 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
149 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
150 #define PNG_FLAG_ZLIB_FINISHED 0x0020
151 #define PNG_FLAG_ROW_INIT 0x0040
152 #define PNG_FLAG_FILLER_AFTER 0x0080
153 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
154 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
155 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400
156 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
160 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
161 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
162 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
163 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
164 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
165 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
166 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
167 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
168 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000L /* Added to libpng-1.4.0 */
169 /* 0x1000000L unused */
170 /* 0x2000000L unused */
171 /* 0x4000000L unused */
172 /* 0x8000000L unused */
173 /* 0x10000000L unused */
174 /* 0x20000000L unused */
175 /* 0x40000000L unused */
177 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
178 PNG_FLAG_CRC_ANCILLARY_NOWARN)
180 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
181 PNG_FLAG_CRC_CRITICAL_IGNORE)
183 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
184 PNG_FLAG_CRC_CRITICAL_MASK)
186 /* Save typing and make code easier to understand */
188 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
189 abs((int)((c1).green) - (int)((c2).green)) + \
190 abs((int)((c1).blue) - (int)((c2).blue)))
192 /* Added to libpng-1.2.6 JB */
193 #define PNG_ROWBYTES(pixel_bits, width) \
194 ((pixel_bits) >= 8 ? \
195 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
196 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
198 /* PNG_OUT_OF_RANGE returns true if value is outside the range
199 * ideal-delta..ideal+delta. Each argument is evaluated twice.
200 * "ideal" and "delta" should be constants, normally simple
201 * integers, "value" a variable. Added to libpng-1.2.6 JB
203 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
204 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
206 /* Constant strings for known chunk types. If you need to add a chunk,
207 * define the name here, and add an invocation of the macro wherever it's
210 #define PNG_IHDR PNG_CONST png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
211 #define PNG_IDAT PNG_CONST png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
212 #define PNG_IEND PNG_CONST png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
213 #define PNG_PLTE PNG_CONST png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
214 #define PNG_bKGD PNG_CONST png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
215 #define PNG_cHRM PNG_CONST png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
216 #define PNG_gAMA PNG_CONST png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
217 #define PNG_hIST PNG_CONST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
218 #define PNG_iCCP PNG_CONST png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
219 #define PNG_iTXt PNG_CONST png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
220 #define PNG_oFFs PNG_CONST png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
221 #define PNG_pCAL PNG_CONST png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
222 #define PNG_sCAL PNG_CONST png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
223 #define PNG_pHYs PNG_CONST png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
224 #define PNG_sBIT PNG_CONST png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
225 #define PNG_sPLT PNG_CONST png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
226 #define PNG_sRGB PNG_CONST png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
227 #define PNG_sTER PNG_CONST png_byte png_sTER[5] = {115, 84, 69, 82, '\0'}
228 #define PNG_tEXt PNG_CONST png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
229 #define PNG_tIME PNG_CONST png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
230 #define PNG_tRNS PNG_CONST png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
231 #define PNG_zTXt PNG_CONST png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
234 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
237 #endif /* __cplusplus */
239 /* These functions are used internally in the code. They generally
240 * shouldn't be used unless you are writing code to add or replace some
241 * functionality in libpng. More information about most functions can
242 * be found in the files where the functions are located.
245 /* Allocate memory for an internal libpng struct */
246 PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
248 /* Free memory from internal libpng struct */
249 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
251 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
252 malloc_fn, png_voidp mem_ptr));
253 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
254 png_free_ptr free_fn, png_voidp mem_ptr));
256 /* Free any memory that info_ptr points to and reset struct. */
257 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
258 png_infop info_ptr));
260 /* Function to allocate memory for zlib. PNGAPI is disallowed. */
261 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
263 /* Function to free memory for zlib. PNGAPI is disallowed. */
264 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
266 /* Next four functions are used internally as callbacks. PNGAPI is required
267 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
269 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
270 png_bytep data, png_size_t length));
272 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
273 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
274 png_bytep buffer, png_size_t length));
277 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
278 png_bytep data, png_size_t length));
280 #ifdef PNG_WRITE_FLUSH_SUPPORTED
281 #ifdef PNG_STDIO_SUPPORTED
282 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
286 /* Reset the CRC variable */
287 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
289 /* Write the "data" buffer to whatever output you are using */
290 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
293 /* Read the chunk header (length + type name) */
294 PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
296 /* Read data from whatever input you are using into the "data" buffer */
297 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
300 /* Read bytes into buf, and update png_ptr->crc */
301 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
304 /* Decompress data in a chunk that uses compression */
305 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
306 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
307 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
308 int comp_type, png_size_t chunklength, png_size_t prefix_length,
309 png_size_t *data_length));
312 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
313 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
315 /* Read the CRC from the file and compare it to the libpng calculated CRC */
316 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
318 /* Calculate the CRC over a section of data. Note that we are only
319 * passing a maximum of 64K on systems that have this as a memory limit,
320 * since this is the maximum buffer size we can specify.
322 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
325 #ifdef PNG_WRITE_FLUSH_SUPPORTED
326 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
329 /* Write various chunks */
331 /* Write the IHDR chunk, and update the png_struct with the necessary
334 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
336 int bit_depth, int color_type, int compression_method, int filter_method,
337 int interlace_method));
339 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
340 png_uint_32 num_pal));
342 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
345 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
347 #ifdef PNG_WRITE_gAMA_SUPPORTED
348 #ifdef PNG_FLOATING_POINT_SUPPORTED
349 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
351 #ifdef PNG_FIXED_POINT_SUPPORTED
352 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr,
353 png_fixed_point file_gamma));
357 #ifdef PNG_WRITE_sBIT_SUPPORTED
358 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
362 #ifdef PNG_WRITE_cHRM_SUPPORTED
363 #ifdef PNG_FLOATING_POINT_SUPPORTED
364 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
365 double white_x, double white_y,
366 double red_x, double red_y, double green_x, double green_y,
367 double blue_x, double blue_y));
369 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
370 png_fixed_point int_white_x, png_fixed_point int_white_y,
371 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
372 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
373 png_fixed_point int_blue_y));
376 #ifdef PNG_WRITE_sRGB_SUPPORTED
377 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
381 #ifdef PNG_WRITE_iCCP_SUPPORTED
382 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
383 png_charp name, int compression_type,
384 png_charp profile, int proflen));
385 /* Note to maintainer: profile should be png_bytep */
388 #ifdef PNG_WRITE_sPLT_SUPPORTED
389 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
390 png_sPLT_tp palette));
393 #ifdef PNG_WRITE_tRNS_SUPPORTED
394 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
395 png_color_16p values, int number, int color_type));
398 #ifdef PNG_WRITE_bKGD_SUPPORTED
399 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
400 png_color_16p values, int color_type));
403 #ifdef PNG_WRITE_hIST_SUPPORTED
404 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
408 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
409 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
410 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
411 png_charp key, png_charpp new_key));
414 #ifdef PNG_WRITE_tEXt_SUPPORTED
415 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
416 png_charp text, png_size_t text_len));
419 #ifdef PNG_WRITE_zTXt_SUPPORTED
420 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
421 png_charp text, png_size_t text_len, int compression));
424 #ifdef PNG_WRITE_iTXt_SUPPORTED
425 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
426 int compression, png_charp key, png_charp lang, png_charp lang_key,
430 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
431 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
432 png_infop info_ptr, png_textp text_ptr, int num_text));
435 #ifdef PNG_WRITE_oFFs_SUPPORTED
436 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
437 png_int_32 x_offset, png_int_32 y_offset, int unit_type));
440 #ifdef PNG_WRITE_pCAL_SUPPORTED
441 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
442 png_int_32 X0, png_int_32 X1, int type, int nparams,
443 png_charp units, png_charpp params));
446 #ifdef PNG_WRITE_pHYs_SUPPORTED
447 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
448 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
452 #ifdef PNG_WRITE_tIME_SUPPORTED
453 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
454 png_timep mod_time));
457 #ifdef PNG_WRITE_sCAL_SUPPORTED
458 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
459 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
460 int unit, double width, double height));
462 #ifdef PNG_FIXED_POINT_SUPPORTED
463 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
464 int unit, png_charp width, png_charp height));
469 /* Called when finished processing a row of data */
470 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
472 /* Internal use only. Called before first row of data */
473 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
475 #ifdef PNG_READ_GAMMA_SUPPORTED
476 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,
477 png_byte bit_depth));
480 /* Combine a row of data, dealing with alpha, etc. if requested */
481 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
484 #ifdef PNG_READ_INTERLACING_SUPPORTED
485 /* Expand an interlaced row */
486 /* OLD pre-1.0.9 interface:
487 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
488 png_bytep row, int pass, png_uint_32 transformations));
490 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
493 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
495 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
496 /* Grab pixels out of a row for an interlaced pass */
497 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
498 png_bytep row, int pass));
502 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
503 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
505 /* Choose the best filter to use and filter the row data */
506 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
507 png_row_infop row_info));
509 /* Write out the filtered row. */
510 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
511 png_bytep filtered_row));
512 /* Finish a row while reading, dealing with interlacing passes, etc. */
513 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
515 /* Initialize the row buffers, etc. */
516 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
517 /* Optional call to update the users info structure */
518 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
519 png_infop info_ptr));
521 /* These are the functions that do the transformations */
522 #ifdef PNG_READ_FILLER_SUPPORTED
523 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
524 png_bytep row, png_uint_32 filler, png_uint_32 flags));
527 #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
528 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
532 #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
533 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
537 #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
538 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
542 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
543 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
547 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
548 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
549 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
550 png_bytep row, png_uint_32 flags));
553 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
554 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
557 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
558 defined(PNG_WRITE_PACKSWAP_SUPPORTED)
559 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
562 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
563 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
564 row_info, png_bytep row));
567 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
568 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
572 #ifdef PNG_READ_PACK_SUPPORTED
573 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
576 #ifdef PNG_READ_SHIFT_SUPPORTED
577 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
578 png_color_8p sig_bits));
581 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
582 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
585 #ifdef PNG_READ_16_TO_8_SUPPORTED
586 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
589 #ifdef PNG_READ_QUANTIZE_SUPPORTED
590 PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info,
591 png_bytep row, png_bytep palette_lookup, png_bytep quantize_lookup));
593 # ifdef PNG_CORRECT_PALETTE_SUPPORTED
594 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
595 png_colorp palette, int num_palette));
599 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
600 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
603 #ifdef PNG_WRITE_PACK_SUPPORTED
604 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
605 png_bytep row, png_uint_32 bit_depth));
608 #ifdef PNG_WRITE_SHIFT_SUPPORTED
609 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
610 png_color_8p bit_depth));
613 #ifdef PNG_READ_BACKGROUND_SUPPORTED
614 #ifdef PNG_READ_GAMMA_SUPPORTED
615 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
616 png_color_16p trans_color, png_color_16p background,
617 png_color_16p background_1,
618 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
619 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
620 png_uint_16pp gamma_16_to_1, int gamma_shift));
622 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
623 png_color_16p trans_color, png_color_16p background));
627 #ifdef PNG_READ_GAMMA_SUPPORTED
628 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
629 png_bytep gamma_table, png_uint_16pp gamma_16_table,
633 #ifdef PNG_READ_EXPAND_SUPPORTED
634 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
635 png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
636 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
637 png_bytep row, png_color_16p trans_value));
640 /* The following decodes the appropriate chunks, and does error correction,
641 * then calls the appropriate callback for the chunk if it is valid.
644 /* Decode the IHDR chunk */
645 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
646 png_uint_32 length));
647 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
648 png_uint_32 length));
649 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
650 png_uint_32 length));
652 #ifdef PNG_READ_bKGD_SUPPORTED
653 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
654 png_uint_32 length));
657 #ifdef PNG_READ_cHRM_SUPPORTED
658 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
659 png_uint_32 length));
662 #ifdef PNG_READ_gAMA_SUPPORTED
663 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
664 png_uint_32 length));
667 #ifdef PNG_READ_hIST_SUPPORTED
668 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
669 png_uint_32 length));
672 #ifdef PNG_READ_iCCP_SUPPORTED
673 PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
674 png_uint_32 length));
675 #endif /* PNG_READ_iCCP_SUPPORTED */
677 #ifdef PNG_READ_iTXt_SUPPORTED
678 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
679 png_uint_32 length));
682 #ifdef PNG_READ_oFFs_SUPPORTED
683 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
684 png_uint_32 length));
687 #ifdef PNG_READ_pCAL_SUPPORTED
688 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
689 png_uint_32 length));
692 #ifdef PNG_READ_pHYs_SUPPORTED
693 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
694 png_uint_32 length));
697 #ifdef PNG_READ_sBIT_SUPPORTED
698 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
699 png_uint_32 length));
702 #ifdef PNG_READ_sCAL_SUPPORTED
703 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
704 png_uint_32 length));
707 #ifdef PNG_READ_sPLT_SUPPORTED
708 PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
709 png_uint_32 length));
710 #endif /* PNG_READ_sPLT_SUPPORTED */
712 #ifdef PNG_READ_sRGB_SUPPORTED
713 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
714 png_uint_32 length));
717 #ifdef PNG_READ_tEXt_SUPPORTED
718 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
719 png_uint_32 length));
722 #ifdef PNG_READ_tIME_SUPPORTED
723 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
724 png_uint_32 length));
727 #ifdef PNG_READ_tRNS_SUPPORTED
728 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
729 png_uint_32 length));
732 #ifdef PNG_READ_zTXt_SUPPORTED
733 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
734 png_uint_32 length));
737 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
738 png_infop info_ptr, png_uint_32 length));
740 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
741 png_bytep chunk_name));
743 /* Handle the transformations for reading and writing */
744 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
745 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
747 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
749 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
750 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
751 png_infop info_ptr));
752 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
753 png_infop info_ptr));
754 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
755 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
756 png_uint_32 length));
757 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
758 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
759 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
760 png_bytep buffer, png_size_t buffer_length));
761 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
762 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
763 png_bytep buffer, png_size_t buffer_length));
764 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
765 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
766 png_infop info_ptr, png_uint_32 length));
767 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
768 png_infop info_ptr));
769 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
770 png_infop info_ptr));
771 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
772 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
773 png_infop info_ptr));
774 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
775 png_infop info_ptr));
776 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
777 #ifdef PNG_READ_tEXt_SUPPORTED
778 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
779 png_infop info_ptr, png_uint_32 length));
780 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
781 png_infop info_ptr));
783 #ifdef PNG_READ_zTXt_SUPPORTED
784 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
785 png_infop info_ptr, png_uint_32 length));
786 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
787 png_infop info_ptr));
789 #ifdef PNG_READ_iTXt_SUPPORTED
790 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
791 png_infop info_ptr, png_uint_32 length));
792 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
793 png_infop info_ptr));
796 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
798 #ifdef PNG_MNG_FEATURES_SUPPORTED
799 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
801 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
805 /* Added at libpng version 1.4.0 */
806 #ifdef PNG_cHRM_SUPPORTED
807 PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
808 png_fixed_point int_white_x, png_fixed_point int_white_y,
809 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
810 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
811 png_fixed_point int_blue_y));
814 #ifdef PNG_cHRM_SUPPORTED
815 #ifdef PNG_CHECK_cHRM_SUPPORTED
816 /* Added at libpng version 1.2.34 and 1.4.0 */
817 PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2,
818 unsigned long *hi_product, unsigned long *lo_product));
822 /* Added at libpng version 1.4.0 */
823 PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,
824 png_uint_32 width, png_uint_32 height, int bit_depth,
825 int color_type, int interlace_type, int compression_type,
828 /* Free all memory used by the read (old method - NOT DLL EXPORTED) */
829 PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
830 png_infop end_info_ptr));
832 /* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
833 PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr));
835 #ifdef USE_FAR_KEYWORD /* memory model conversion function */
836 PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
838 #endif /* USE_FAR_KEYWORD */
840 /* Define PNG_DEBUG at compile time for debugging information. Higher
841 * numbers for PNG_DEBUG mean more debugging information. This has
842 * only been added since version 0.95 so it is not implemented throughout
843 * libpng yet, but more support will be added as needed.
847 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
854 #define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
857 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
860 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
863 #else /* PNG_DEBUG_FILE || !_MSC_VER */
864 #ifndef PNG_DEBUG_FILE
865 #define PNG_DEBUG_FILE stderr
866 #endif /* PNG_DEBUG_FILE */
869 /* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on
874 # define png_debug(l,m) \
877 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
878 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
882 # define png_debug1(l,m,p1) \
885 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
886 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
890 # define png_debug2(l,m,p1,p2) \
893 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
894 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
897 # else /* __STDC __ */
899 # define png_debug(l,m) \
903 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
904 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
905 m,PNG_STRING_NEWLINE); \
906 fprintf(PNG_DEBUG_FILE,format); \
910 # define png_debug1(l,m,p1) \
914 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
915 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
916 m,PNG_STRING_NEWLINE); \
917 fprintf(PNG_DEBUG_FILE,format,p1); \
921 # define png_debug2(l,m,p1,p2) \
925 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
926 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
927 m,PNG_STRING_NEWLINE); \
928 fprintf(PNG_DEBUG_FILE,format,p1,p2); \
931 # endif /* __STDC __ */
932 #endif /* (PNG_DEBUG > 1) */
934 #endif /* _MSC_VER */
935 #endif /* (PNG_DEBUG > 0) */
936 #endif /* PNG_DEBUG */
938 #define png_debug(l, m)
941 #define png_debug1(l, m, p1)
944 #define png_debug2(l, m, p1, p2)
947 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
953 #endif /* PNG_VERSION_INFO_ONLY */
954 #endif /* PNGPRIV_H */