| |
| /* pngpriv.h - private declarations for use inside libpng |
| * |
| * For conditions of distribution and use, see copyright notice in png.h |
| * Copyright (c) 1998-2011 Glenn Randers-Pehrson |
| * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
| * |
| * Last changed in libpng 1.5.0 [January 6, 2011] |
| * |
| * This code is released under the libpng license. |
| * For conditions of distribution and use, see the disclaimer |
| * and license in png.h |
| */ |
| |
| /* The symbols declared in this file (including the functions declared |
| * as PNG_EXTERN) are PRIVATE. They are not part of the libpng public |
| * interface, and are not recommended for use by regular applications. |
| * Some of them may become public in the future; others may stay private, |
| * change in an incompatible way, or even disappear. |
| * Although the libpng users are not forbidden to include this header, |
| * they should be well aware of the issues that may arise from doing so. |
| */ |
| |
| #ifndef PNGPRIV_H |
| #define PNGPRIV_H |
| |
| /* This is required for the definition of abort(), used as a last ditch |
| * error handler when all else fails. |
| */ |
| #include <stdlib.h> |
| |
| #define PNGLIB_BUILD |
| #ifdef PNG_USER_CONFIG |
| # include "pngusr.h" |
| /* These should have been defined in pngusr.h */ |
| # ifndef PNG_USER_PRIVATEBUILD |
| # define PNG_USER_PRIVATEBUILD "Custom libpng build" |
| # endif |
| # ifndef PNG_USER_DLLFNAME_POSTFIX |
| # define PNG_USER_DLLFNAME_POSTFIX "Cb" |
| # endif |
| #endif |
| #include "png.h" |
| #include "pnginfo.h" |
| #include "pngstruct.h" |
| |
| /* This is used for 16 bit gamma tables - only the top level pointers are const, |
| * this could be changed: |
| */ |
| typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp; |
| |
| /* Added at libpng-1.2.9 */ |
| /* Moved to pngpriv.h at libpng-1.5.0 */ |
| |
| /* config.h is created by and PNG_CONFIGURE_LIBPNG is set by the "configure" |
| * script. We may need it here to get the correct configuration on things |
| * like limits. |
| */ |
| #ifdef PNG_CONFIGURE_LIBPNG |
| # ifdef HAVE_CONFIG_H |
| # include "config.h" |
| # endif |
| #endif |
| |
| /* Moved to pngpriv.h at libpng-1.5.0 */ |
| /* NOTE: some of these may have been used in external applications as |
| * these definitions were exposed in pngconf.h prior to 1.5. |
| */ |
| |
| /* If you are running on a machine where you cannot allocate more |
| * than 64K of memory at once, uncomment this. While libpng will not |
| * normally need that much memory in a chunk (unless you load up a very |
| * large file), zlib needs to know how big of a chunk it can use, and |
| * libpng thus makes sure to check any memory allocation to verify it |
| * will fit into memory. |
| * |
| * zlib provides 'MAXSEG_64K' which, if defined, indicates the |
| * same limit and pngconf.h (already included) sets the limit |
| * if certain operating systems are detected. |
| */ |
| #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) |
| # define PNG_MAX_MALLOC_64K |
| #endif |
| |
| /* Unused formal parameter errors are removed using the following macro |
| * which is expected to have no bad effects on performance. Note that |
| * if you replace it with something other than whitespace, you must include |
| * the terminating semicolon. Also note that some of these might not |
| * work when "param" is a structure, but that is never the case in libpng. |
| */ |
| #define PNG_UNUSED(param) {if(param){}} |
| |
| #if 0 /* Possibilities discussed on png-mng-implement, starting 27 Jan 2011 */ |
| #ifndef PNG_UNUSED /* "best" but complex */ |
| #if defined(__GNUC__) || defined(_MSC_VER) |
| # define PNG_UNUSED(param) (void)param; |
| #else |
| # define PNG_UNUSED(param) |
| #endif |
| #define PNG_UNUSED(param) param = param; /* What we used before */ |
| #define PNG_UNUSED(param) {(void)param;} /* Visual C complains */ |
| #define PNG_UNUSED(param) if(param); /* gcc-4.2 complains */ |
| #define PNG_UNUSED(param) if(param){} /* more brackets nicer */ |
| #define PNG_UNUSED(param) ((void)(param ? 0 : 0)); /* 0:0 might be seen */ |
| #define PNG_UNUSED(param) {if(¶m){}} /* gcc-4 complains */ |
| #define PNG_UNUSED(param) {if(¶m-¶m){}} /* No comment. */ |
| #define PNG_UNUSED(param) /* generates smallest (no) code but emits warning */ |
| #endif /* 0 */ |
| #endif /* PNG_UNUSED */ |
| |
| /* Just a little check that someone hasn't tried to define something |
| * contradictory. |
| */ |
| #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) |
| # undef PNG_ZBUF_SIZE |
| # define PNG_ZBUF_SIZE 65536L |
| #endif |
| |
| /* If warnings or errors are turned off the code is disabled |
| * or redirected here. |
| */ |
| #ifndef PNG_WARNINGS_SUPPORTED |
| # define png_warning(s1,s2) ((void)0) |
| # define png_chunk_warning(s1,s2) ((void)0) |
| #endif |
| #ifndef PNG_ERROR_TEXT_SUPPORTED |
| # define png_error(s1,s2) png_err(s1) |
| # define png_chunk_error(s1,s2) png_err(s1) |
| # define png_fixed_error(s1,s2) png_err(s1) |
| #endif |
| |
| #ifndef PNG_EXTERN |
| /* The functions exported by PNG_EXTERN are internal functions, which |
| * aren't usually used outside the library (as far as I know), so it is |
| * debatable if they should be exported at all. In the future, when it |
| * is possible to have run-time registry of chunk-handling functions, |
| * some of these might be made available again. |
| # define PNG_EXTERN extern |
| */ |
| # define PNG_EXTERN |
| #endif |
| |
| /* Some fixed point APIs are still required even if not exported because |
| * they get used by the corresponding floating point APIs. This magic |
| * deals with this: |
| */ |
| #ifdef PNG_FIXED_POINT_SUPPORTED |
| # define PNGFAPI PNGAPI |
| #else |
| # define PNGFAPI /* PRIVATE */ |
| #endif |
| |
| /* Other defines specific to compilers can go here. Try to keep |
| * them inside an appropriate ifdef/endif pair for portability. |
| */ |
| #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ |
| defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) |
| /* png.c requires the following ANSI-C constants if the conversion of |
| * floating point to ASCII is implemented therein: |
| * |
| * DBL_DIG Maximum number of decimal digits (can be set to any constant) |
| * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) |
| * DBL_MAX Maximum floating point number (can be set to an arbitrary value) |
| */ |
| # include <float.h> |
| |
| # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ |
| defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) |
| /* We need to check that <math.h> hasn't already been included earlier |
| * as it seems it doesn't agree with <fp.h>, yet we should really use |
| * <fp.h> if possible. |
| */ |
| # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) |
| # include <fp.h> |
| # endif |
| # else |
| # include <math.h> |
| # endif |
| # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) |
| /* Amiga SAS/C: We must include builtin FPU functions when compiling using |
| * MATH=68881 |
| */ |
| # include <m68881.h> |
| # endif |
| #endif |
| |
| /* This provides the non-ANSI (far) memory allocation routines. */ |
| #if defined(__TURBOC__) && defined(__MSDOS__) |
| # include <mem.h> |
| # include <alloc.h> |
| #endif |
| |
| #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ |
| defined(_WIN32) || defined(__WIN32__) |
| # include <windows.h> /* defines _WINDOWS_ macro */ |
| #endif |
| |
| /* Moved here around 1.5.0beta36 from pngconf.h */ |
| /* Users may want to use these so they are not private. Any library |
| * functions that are passed far data must be model-independent. |
| */ |
| |
| /* Memory model/platform independent fns */ |
| #ifndef PNG_ABORT |
| # ifdef _WINDOWS_ |
| # define PNG_ABORT() ExitProcess(0) |
| # else |
| # define PNG_ABORT() abort() |
| # endif |
| #endif |
| |
| #ifdef USE_FAR_KEYWORD |
| /* Use this to make far-to-near assignments */ |
| # define CHECK 1 |
| # define NOCHECK 0 |
| # define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK)) |
| # define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK)) |
| # define png_strcpy _fstrcpy |
| # define png_strncpy _fstrncpy /* Added to v 1.2.6 */ |
| # define png_strlen _fstrlen |
| # define png_memcmp _fmemcmp /* SJT: added */ |
| # define png_memcpy _fmemcpy |
| # define png_memset _fmemset |
| # define png_sprintf sprintf |
| #else |
| # ifdef _WINDOWS_ /* Favor Windows over C runtime fns */ |
| # define CVT_PTR(ptr) (ptr) |
| # define CVT_PTR_NOCHECK(ptr) (ptr) |
| # define png_strcpy lstrcpyA |
| # define png_strncpy lstrcpynA |
| # define png_strlen lstrlenA |
| # define png_memcmp memcmp |
| # define png_memcpy CopyMemory |
| # define png_memset memset |
| # define png_sprintf wsprintfA |
| # else |
| # define CVT_PTR(ptr) (ptr) |
| # define CVT_PTR_NOCHECK(ptr) (ptr) |
| # define png_strcpy strcpy |
| # define png_strncpy strncpy /* Added to v 1.2.6 */ |
| # define png_strlen strlen |
| # define png_memcmp memcmp /* SJT: added */ |
| # define png_memcpy memcpy |
| # define png_memset memset |
| # define png_sprintf sprintf |
| # endif |
| #endif |
| /* End of memory model/platform independent support */ |
| |
| #ifndef PNG_NO_SNPRINTF |
| # ifdef _MSC_VER |
| # define png_snprintf _snprintf /* Added to v 1.2.19 */ |
| # define png_snprintf2 _snprintf |
| # define png_snprintf6 _snprintf |
| # else |
| # define png_snprintf snprintf /* Added to v 1.2.19 */ |
| # define png_snprintf2 snprintf |
| # define png_snprintf6 snprintf |
| # endif |
| #else |
| /* You don't have or don't want to use snprintf(). Caution: Using |
| * sprintf instead of snprintf exposes your application to accidental |
| * or malevolent buffer overflows. If you don't have snprintf() |
| * as a general rule you should provide one (you can get one from |
| * Portable OpenSSH). |
| */ |
| # define png_snprintf(s1,n,fmt,x1) png_sprintf(s1,fmt,x1) |
| # define png_snprintf2(s1,n,fmt,x1,x2) png_sprintf(s1,fmt,x1,x2) |
| # define png_snprintf6(s1,n,fmt,x1,x2,x3,x4,x5,x6) \ |
| png_sprintf(s1,fmt,x1,x2,x3,x4,x5,x6) |
| #endif |
| /* End of 1.5.0beta36 move from pngconf.h */ |
| |
| /* CONSTANTS and UTILITY MACROS |
| * These are used internally by libpng and not exposed in the API |
| */ |
| |
| /* Various modes of operation. Note that after an init, mode is set to |
| * zero automatically when the structure is created. |
| */ |
| #define PNG_HAVE_IHDR 0x01 |
| #define PNG_HAVE_PLTE 0x02 |
| #define PNG_HAVE_IDAT 0x04 |
| #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ |
| #define PNG_HAVE_IEND 0x10 |
| #define PNG_HAVE_gAMA 0x20 |
| #define PNG_HAVE_cHRM 0x40 |
| #define PNG_HAVE_sRGB 0x80 |
| #define PNG_HAVE_CHUNK_HEADER 0x100 |
| #define PNG_WROTE_tIME 0x200 |
| #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 |
| #define PNG_BACKGROUND_IS_GRAY 0x800 |
| #define PNG_HAVE_PNG_SIGNATURE 0x1000 |
| #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ |
| |
| /* Flags for the transformations the PNG library does on the image data */ |
| #define PNG_BGR 0x0001 |
| #define PNG_INTERLACE 0x0002 |
| #define PNG_PACK 0x0004 |
| #define PNG_SHIFT 0x0008 |
| #define PNG_SWAP_BYTES 0x0010 |
| #define PNG_INVERT_MONO 0x0020 |
| #define PNG_QUANTIZE 0x0040 |
| #define PNG_BACKGROUND 0x0080 |
| #define PNG_BACKGROUND_EXPAND 0x0100 |
| /* 0x0200 unused */ |
| #define PNG_16_TO_8 0x0400 |
| #define PNG_RGBA 0x0800 |
| #define PNG_EXPAND 0x1000 |
| #define PNG_GAMMA 0x2000 |
| #define PNG_GRAY_TO_RGB 0x4000 |
| #define PNG_FILLER 0x8000L |
| #define PNG_PACKSWAP 0x10000L |
| #define PNG_SWAP_ALPHA 0x20000L |
| #define PNG_STRIP_ALPHA 0x40000L |
| #define PNG_INVERT_ALPHA 0x80000L |
| #define PNG_USER_TRANSFORM 0x100000L |
| #define PNG_RGB_TO_GRAY_ERR 0x200000L |
| #define PNG_RGB_TO_GRAY_WARN 0x400000L |
| #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ |
| /* 0x800000L Unused */ |
| #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ |
| #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ |
| /* 0x4000000L unused */ |
| /* 0x8000000L unused */ |
| /* 0x10000000L unused */ |
| /* 0x20000000L unused */ |
| /* 0x40000000L unused */ |
| |
| /* Flags for png_create_struct */ |
| #define PNG_STRUCT_PNG 0x0001 |
| #define PNG_STRUCT_INFO 0x0002 |
| |
| /* Scaling factor for filter heuristic weighting calculations */ |
| #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) |
| #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) |
| |
| /* Flags for the png_ptr->flags rather than declaring a byte for each one */ |
| #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 |
| #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 |
| #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 |
| #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 |
| #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 |
| #define PNG_FLAG_ZLIB_FINISHED 0x0020 |
| #define PNG_FLAG_ROW_INIT 0x0040 |
| #define PNG_FLAG_FILLER_AFTER 0x0080 |
| #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 |
| #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 |
| #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 |
| #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 |
| /* 0x1000 unused */ |
| /* 0x2000 unused */ |
| /* 0x4000 unused */ |
| #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L |
| #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L |
| #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L |
| #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L |
| #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L |
| #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L |
| #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ |
| #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ |
| #define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000L /* Added to libpng-1.4.0 */ |
| /* 0x1000000L unused */ |
| /* 0x2000000L unused */ |
| /* 0x4000000L unused */ |
| /* 0x8000000L unused */ |
| /* 0x10000000L unused */ |
| /* 0x20000000L unused */ |
| /* 0x40000000L unused */ |
| |
| #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ |
| PNG_FLAG_CRC_ANCILLARY_NOWARN) |
| |
| #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ |
| PNG_FLAG_CRC_CRITICAL_IGNORE) |
| |
| #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ |
| PNG_FLAG_CRC_CRITICAL_MASK) |
| |
| /* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib |
| * can handle at once. This type need be no larger than 16 bits (so maximum of |
| * 65535), this define allows us to discover how big it is, but limited by the |
| * maximuum for png_size_t. The value can be overriden in a library build |
| * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably |
| * lower value (e.g. 255 works). A lower value may help memory usage (slightly) |
| * and may even improve performance on some systems (and degrade it on others.) |
| */ |
| #ifndef ZLIB_IO_MAX |
| # define ZLIB_IO_MAX ((uInt)-1) |
| #endif |
| |
| /* Save typing and make code easier to understand */ |
| |
| #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ |
| abs((int)((c1).green) - (int)((c2).green)) + \ |
| abs((int)((c1).blue) - (int)((c2).blue))) |
| |
| /* Added to libpng-1.2.6 JB */ |
| #define PNG_ROWBYTES(pixel_bits, width) \ |
| ((pixel_bits) >= 8 ? \ |
| ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ |
| (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) |
| |
| /* PNG_OUT_OF_RANGE returns true if value is outside the range |
| * ideal-delta..ideal+delta. Each argument is evaluated twice. |
| * "ideal" and "delta" should be constants, normally simple |
| * integers, "value" a variable. Added to libpng-1.2.6 JB |
| */ |
| #define PNG_OUT_OF_RANGE(value, ideal, delta) \ |
| ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) |
| |
| /* Conversions between fixed and floating point, only defined if |
| * required (to make sure the code doesn't accidentally use float |
| * when it is supposedly disabled.) |
| */ |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| /* The floating point conversion can't overflow, though it can and |
| * does lose accuracy relative to the original fixed point value. |
| * In practice this doesn't matter because png_fixed_point only |
| * stores numbers with very low precision. The png_ptr and s |
| * arguments are unused by default but are there in case error |
| * checking becomes a requirement. |
| */ |
| #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) |
| |
| /* The fixed point conversion performs range checking and evaluates |
| * its argument multiple times, so must be used with care. The |
| * range checking uses the PNG specification values for a signed |
| * 32 bit fixed point value except that the values are deliberately |
| * rounded-to-zero to an integral value - 21474 (21474.83 is roughly |
| * (2^31-1) * 100000). 's' is a string that describes the value being |
| * converted. |
| * |
| * NOTE: this macro will raise a png_error if the range check fails, |
| * therefore it is normally only appropriate to use this on values |
| * that come from API calls or other sources where an out of range |
| * error indicates a programming error, not a data error! |
| * |
| * NOTE: by default this is off - the macro is not used - because the |
| * function call saves a lot of code. |
| */ |
| #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED |
| #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ |
| ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) |
| #else |
| PNG_EXTERN png_fixed_point png_fixed PNGARG((png_structp png_ptr, double fp, |
| png_const_charp text)); |
| #endif |
| #endif |
| |
| /* Constant strings for known chunk types. If you need to add a chunk, |
| * define the name here, and add an invocation of the macro wherever it's |
| * needed. |
| */ |
| #define PNG_IHDR PNG_CONST png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} |
| #define PNG_IDAT PNG_CONST png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} |
| #define PNG_IEND PNG_CONST png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} |
| #define PNG_PLTE PNG_CONST png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} |
| #define PNG_bKGD PNG_CONST png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} |
| #define PNG_cHRM PNG_CONST png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} |
| #define PNG_gAMA PNG_CONST png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} |
| #define PNG_hIST PNG_CONST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} |
| #define PNG_iCCP PNG_CONST png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} |
| #define PNG_iTXt PNG_CONST png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} |
| #define PNG_oFFs PNG_CONST png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} |
| #define PNG_pCAL PNG_CONST png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} |
| #define PNG_sCAL PNG_CONST png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} |
| #define PNG_pHYs PNG_CONST png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} |
| #define PNG_sBIT PNG_CONST png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} |
| #define PNG_sPLT PNG_CONST png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} |
| #define PNG_sRGB PNG_CONST png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} |
| #define PNG_sTER PNG_CONST png_byte png_sTER[5] = {115, 84, 69, 82, '\0'} |
| #define PNG_tEXt PNG_CONST png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} |
| #define PNG_tIME PNG_CONST png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} |
| #define PNG_tRNS PNG_CONST png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} |
| #define PNG_zTXt PNG_CONST png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} |
| |
| |
| /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ |
| #ifdef __cplusplus |
| extern "C" { |
| #endif /* __cplusplus */ |
| |
| /* These functions are used internally in the code. They generally |
| * shouldn't be used unless you are writing code to add or replace some |
| * functionality in libpng. More information about most functions can |
| * be found in the files where the functions are located. |
| */ |
| |
| /* Allocate memory for an internal libpng struct */ |
| PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct,PNGARG((int type)), |
| PNG_ALLOCATED); |
| |
| /* Free memory from internal libpng struct */ |
| PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); |
| |
| PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct_2, |
| PNGARG((int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)), |
| PNG_ALLOCATED); |
| PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, |
| png_free_ptr free_fn, png_voidp mem_ptr)); |
| |
| /* Free any memory that info_ptr points to and reset struct. */ |
| PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| |
| /* Function to allocate memory for zlib. PNGAPI is disallowed. */ |
| PNG_EXTERN PNG_FUNCTION(voidpf,png_zalloc,PNGARG((voidpf png_ptr, uInt items, |
| uInt size)),PNG_ALLOCATED); |
| |
| /* Function to free memory for zlib. PNGAPI is disallowed. */ |
| PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); |
| |
| /* Next four functions are used internally as callbacks. PNGCBAPI is required |
| * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to |
| * PNGCBAPI at 1.5.0 |
| */ |
| |
| PNG_EXTERN void PNGCBAPI png_default_read_data PNGARG((png_structp png_ptr, |
| png_bytep data, png_size_t length)); |
| |
| #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| PNG_EXTERN void PNGCBAPI png_push_fill_buffer PNGARG((png_structp png_ptr, |
| png_bytep buffer, png_size_t length)); |
| #endif |
| |
| PNG_EXTERN void PNGCBAPI png_default_write_data PNGARG((png_structp png_ptr, |
| png_bytep data, png_size_t length)); |
| |
| #ifdef PNG_WRITE_FLUSH_SUPPORTED |
| # ifdef PNG_STDIO_SUPPORTED |
| PNG_EXTERN void PNGCBAPI png_default_flush PNGARG((png_structp png_ptr)); |
| # endif |
| #endif |
| |
| /* Reset the CRC variable */ |
| PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); |
| |
| /* Write the "data" buffer to whatever output you are using */ |
| PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, |
| png_const_bytep data, png_size_t length)); |
| |
| /* Read and check the PNG file signature */ |
| PNG_EXTERN void png_read_sig PNGARG((png_structp png_ptr, png_infop info_ptr)); |
| |
| /* Read the chunk header (length + type name) */ |
| PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr)); |
| |
| /* Read data from whatever input you are using into the "data" buffer */ |
| PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, |
| png_size_t length)); |
| |
| /* Read bytes into buf, and update png_ptr->crc */ |
| PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, |
| png_size_t length)); |
| |
| /* Decompress data in a chunk that uses compression */ |
| #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ |
| defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) |
| PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, |
| int comp_type, png_size_t chunklength, png_size_t prefix_length, |
| png_size_t *data_length)); |
| #endif |
| |
| /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ |
| PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); |
| |
| /* Read the CRC from the file and compare it to the libpng calculated CRC */ |
| PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); |
| |
| /* Calculate the CRC over a section of data. Note that we are only |
| * passing a maximum of 64K on systems that have this as a memory limit, |
| * since this is the maximum buffer size we can specify. |
| */ |
| PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, |
| png_const_bytep ptr, png_size_t length)); |
| |
| #ifdef PNG_WRITE_FLUSH_SUPPORTED |
| PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); |
| #endif |
| |
| /* Write various chunks */ |
| |
| /* Write the IHDR chunk, and update the png_struct with the necessary |
| * information. |
| */ |
| PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, |
| png_uint_32 height, |
| int bit_depth, int color_type, int compression_method, int filter_method, |
| int interlace_method)); |
| |
| PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, |
| png_const_colorp palette, png_uint_32 num_pal)); |
| |
| PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, |
| png_size_t length)); |
| |
| PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); |
| |
| #ifdef PNG_WRITE_gAMA_SUPPORTED |
| # ifdef PNG_FLOATING_POINT_SUPPORTED |
| PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); |
| # endif |
| # ifdef PNG_FIXED_POINT_SUPPORTED |
| PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, |
| png_fixed_point file_gamma)); |
| # endif |
| #endif |
| |
| #ifdef PNG_WRITE_sBIT_SUPPORTED |
| PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, |
| png_const_color_8p sbit, int color_type)); |
| #endif |
| |
| #ifdef PNG_WRITE_cHRM_SUPPORTED |
| # ifdef PNG_FLOATING_POINT_SUPPORTED |
| PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, |
| double white_x, double white_y, |
| double red_x, double red_y, double green_x, double green_y, |
| double blue_x, double blue_y)); |
| # endif |
| PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, |
| png_fixed_point int_white_x, png_fixed_point int_white_y, |
| png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
| int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
| png_fixed_point int_blue_y)); |
| #endif |
| |
| #ifdef PNG_WRITE_sRGB_SUPPORTED |
| PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, |
| int intent)); |
| #endif |
| |
| #ifdef PNG_WRITE_iCCP_SUPPORTED |
| PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, |
| png_const_charp name, int compression_type, |
| png_const_charp profile, int proflen)); |
| /* Note to maintainer: profile should be png_bytep */ |
| #endif |
| |
| #ifdef PNG_WRITE_sPLT_SUPPORTED |
| PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, |
| png_const_sPLT_tp palette)); |
| #endif |
| |
| #ifdef PNG_WRITE_tRNS_SUPPORTED |
| PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, |
| png_const_bytep trans, png_const_color_16p values, int number, |
| int color_type)); |
| #endif |
| |
| #ifdef PNG_WRITE_bKGD_SUPPORTED |
| PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, |
| png_const_color_16p values, int color_type)); |
| #endif |
| |
| #ifdef PNG_WRITE_hIST_SUPPORTED |
| PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, |
| png_const_uint_16p hist, int num_hist)); |
| #endif |
| |
| #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ |
| defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) |
| PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, |
| png_const_charp key, png_charpp new_key)); |
| #endif |
| |
| #ifdef PNG_WRITE_tEXt_SUPPORTED |
| PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_const_charp key, |
| png_const_charp text, png_size_t text_len)); |
| #endif |
| |
| #ifdef PNG_WRITE_zTXt_SUPPORTED |
| PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_const_charp key, |
| png_const_charp text, png_size_t text_len, int compression)); |
| #endif |
| |
| #ifdef PNG_WRITE_iTXt_SUPPORTED |
| PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, |
| int compression, png_const_charp key, png_const_charp lang, |
| png_const_charp lang_key, png_const_charp text)); |
| #endif |
| |
| #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ |
| PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_const_textp text_ptr, int num_text)); |
| #endif |
| |
| #ifdef PNG_WRITE_oFFs_SUPPORTED |
| PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, |
| png_int_32 x_offset, png_int_32 y_offset, int unit_type)); |
| #endif |
| |
| #ifdef PNG_WRITE_pCAL_SUPPORTED |
| PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, |
| png_int_32 X0, png_int_32 X1, int type, int nparams, |
| png_const_charp units, png_charpp params)); |
| #endif |
| |
| #ifdef PNG_WRITE_pHYs_SUPPORTED |
| PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, |
| png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, |
| int unit_type)); |
| #endif |
| |
| #ifdef PNG_WRITE_tIME_SUPPORTED |
| PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, |
| png_const_timep mod_time)); |
| #endif |
| |
| #ifdef PNG_WRITE_sCAL_SUPPORTED |
| PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, |
| int unit, png_const_charp width, png_const_charp height)); |
| #endif |
| |
| /* Called when finished processing a row of data */ |
| PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); |
| |
| /* Internal use only. Called before first row of data */ |
| PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); |
| |
| /* Combine a row of data, dealing with alpha, etc. if requested */ |
| PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, |
| int mask)); |
| |
| #ifdef PNG_READ_INTERLACING_SUPPORTED |
| /* Expand an interlaced row */ |
| /* OLD pre-1.0.9 interface: |
| PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, |
| png_bytep row, int pass, png_uint_32 transformations)); |
| */ |
| PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)); |
| #endif |
| |
| /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ |
| |
| #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
| /* Grab pixels out of a row for an interlaced pass */ |
| PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, |
| png_bytep row, int pass)); |
| #endif |
| |
| /* Unfilter a row */ |
| PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, |
| png_row_infop row_info, png_bytep row, png_const_bytep prev_row, |
| int filter)); |
| |
| /* Choose the best filter to use and filter the row data */ |
| PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, |
| png_row_infop row_info)); |
| |
| /* Write out the filtered row. */ |
| PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, |
| png_bytep filtered_row)); |
| /* Finish a row while reading, dealing with interlacing passes, etc. */ |
| PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); |
| |
| /* Initialize the row buffers, etc. */ |
| PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); |
| /* Optional call to update the users info structure */ |
| PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| |
| /* These are the functions that do the transformations */ |
| #ifdef PNG_READ_FILLER_SUPPORTED |
| PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, |
| png_bytep row, png_uint_32 filler, png_uint_32 flags)); |
| #endif |
| |
| #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED |
| PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| |
| #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED |
| PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| |
| #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED |
| PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| |
| #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED |
| PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| |
| #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ |
| defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
| PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, |
| png_bytep row, png_uint_32 flags)); |
| #endif |
| |
| #ifdef PNG_16BIT_SUPPORTED |
| #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
| PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| #endif |
| |
| #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ |
| defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
| PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| |
| #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED |
| PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, |
| png_row_infop row_info, png_bytep row)); |
| #endif |
| |
| #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED |
| PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| |
| #ifdef PNG_READ_PACK_SUPPORTED |
| PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| |
| #ifdef PNG_READ_SHIFT_SUPPORTED |
| PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, |
| png_bytep row, png_const_color_8p sig_bits)); |
| #endif |
| |
| #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
| PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| |
| #ifdef PNG_READ_16_TO_8_SUPPORTED |
| PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| |
| #ifdef PNG_READ_QUANTIZE_SUPPORTED |
| PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info, |
| png_bytep row, png_const_bytep palette_lookup, |
| png_const_bytep quantize_lookup)); |
| |
| # ifdef PNG_CORRECT_PALETTE_SUPPORTED |
| PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, |
| png_colorp palette, int num_palette)); |
| # endif |
| #endif |
| |
| #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
| PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| |
| #ifdef PNG_WRITE_PACK_SUPPORTED |
| PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, |
| png_bytep row, png_uint_32 bit_depth)); |
| #endif |
| |
| #ifdef PNG_WRITE_SHIFT_SUPPORTED |
| PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, |
| png_bytep row, png_const_color_8p bit_depth)); |
| #endif |
| |
| #ifdef PNG_READ_BACKGROUND_SUPPORTED |
| # ifdef PNG_READ_GAMMA_SUPPORTED |
| PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, |
| png_bytep row, png_const_color_16p trans_color, |
| png_const_color_16p background, png_const_color_16p background_1, |
| png_const_bytep gamma_table, png_const_bytep gamma_from_1, |
| png_const_bytep gamma_to_1, png_const_uint_16pp gamma_16, |
| png_const_uint_16pp gamma_16_from_1, png_const_uint_16pp gamma_16_to_1, |
| int gamma_shift)); |
| # else |
| PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, |
| png_bytep row, png_const_color_16p trans_color, |
| png_const_color_16p background)); |
| # endif |
| #endif |
| |
| #ifdef PNG_READ_GAMMA_SUPPORTED |
| PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, |
| png_bytep row, png_const_bytep gamma_table, |
| png_const_uint_16pp gamma_16_table, int gamma_shift)); |
| #endif |
| |
| #ifdef PNG_READ_EXPAND_SUPPORTED |
| PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, |
| png_bytep row, png_const_colorp palette, png_const_bytep trans, |
| int num_trans)); |
| PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, |
| png_bytep row, png_const_color_16p trans_color)); |
| #endif |
| |
| /* The following decodes the appropriate chunks, and does error correction, |
| * then calls the appropriate callback for the chunk if it is valid. |
| */ |
| |
| /* Decode the IHDR chunk */ |
| PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| |
| #ifdef PNG_READ_bKGD_SUPPORTED |
| PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #ifdef PNG_READ_cHRM_SUPPORTED |
| PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #ifdef PNG_READ_gAMA_SUPPORTED |
| PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #ifdef PNG_READ_hIST_SUPPORTED |
| PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #ifdef PNG_READ_iCCP_SUPPORTED |
| PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif /* PNG_READ_iCCP_SUPPORTED */ |
| |
| #ifdef PNG_READ_iTXt_SUPPORTED |
| PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #ifdef PNG_READ_oFFs_SUPPORTED |
| PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #ifdef PNG_READ_pCAL_SUPPORTED |
| PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #ifdef PNG_READ_pHYs_SUPPORTED |
| PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #ifdef PNG_READ_sBIT_SUPPORTED |
| PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #ifdef PNG_READ_sCAL_SUPPORTED |
| PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #ifdef PNG_READ_sPLT_SUPPORTED |
| PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif /* PNG_READ_sPLT_SUPPORTED */ |
| |
| #ifdef PNG_READ_sRGB_SUPPORTED |
| PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #ifdef PNG_READ_tEXt_SUPPORTED |
| PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #ifdef PNG_READ_tIME_SUPPORTED |
| PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #ifdef PNG_READ_tRNS_SUPPORTED |
| PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #ifdef PNG_READ_zTXt_SUPPORTED |
| PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 length)); |
| |
| PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, |
| png_const_bytep chunk_name)); |
| |
| /* Handle the transformations for reading and writing */ |
| PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); |
| PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); |
| |
| PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); |
| |
| #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); |
| PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, |
| png_uint_32 length)); |
| PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); |
| PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); |
| PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, |
| png_bytep buffer, png_size_t buffer_length)); |
| PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); |
| PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, |
| png_bytep buffer, png_size_t buffer_length)); |
| PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); |
| PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 length)); |
| PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); |
| PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); |
| # ifdef PNG_READ_tEXt_SUPPORTED |
| PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 length)); |
| PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| # endif |
| # ifdef PNG_READ_zTXt_SUPPORTED |
| PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 length)); |
| PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| # endif |
| # ifdef PNG_READ_iTXt_SUPPORTED |
| PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 length)); |
| PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| # endif |
| |
| #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| |
| #ifdef PNG_MNG_FEATURES_SUPPORTED |
| PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| |
| /* Added at libpng version 1.4.0 */ |
| #ifdef PNG_CHECK_cHRM_SUPPORTED |
| PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, |
| png_fixed_point int_white_x, png_fixed_point int_white_y, |
| png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
| int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
| png_fixed_point int_blue_y)); |
| #endif |
| |
| #ifdef PNG_CHECK_cHRM_SUPPORTED |
| /* Added at libpng version 1.2.34 and 1.4.0 */ |
| /* Currently only used by png_check_cHRM_fixed */ |
| PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2, |
| unsigned long *hi_product, unsigned long *lo_product)); |
| #endif |
| |
| /* Added at libpng version 1.4.0 */ |
| PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr, |
| png_uint_32 width, png_uint_32 height, int bit_depth, |
| int color_type, int interlace_type, int compression_type, |
| int filter_type)); |
| |
| /* Free all memory used by the read (old method - NOT DLL EXPORTED) */ |
| PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_infop end_info_ptr)); |
| |
| /* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ |
| PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr)); |
| |
| #ifdef USE_FAR_KEYWORD /* memory model conversion function */ |
| PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr, png_voidp ptr, |
| int check)); |
| #endif /* USE_FAR_KEYWORD */ |
| |
| #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) |
| PNG_EXTERN PNG_FUNCTION(void, png_fixed_error, (png_structp png_ptr, |
| png_const_charp name),PNG_NORETURN); |
| #endif |
| |
| /* ASCII to FP interfaces, currently only implemented if sCAL |
| * support is required. |
| */ |
| #if defined(PNG_READ_sCAL_SUPPORTED) |
| /* MAX_DIGITS is actually the maximum number of characters in an sCAL |
| * width or height, derived from the precision (number of significant |
| * digits - a build time settable option) and assumpitions about the |
| * maximum ridiculous exponent. |
| */ |
| #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) |
| |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| PNG_EXTERN void png_ascii_from_fp PNGARG((png_structp png_ptr, png_charp ascii, |
| png_size_t size, double fp, unsigned int precision)); |
| #endif /* FLOATING_POINT */ |
| |
| #ifdef PNG_FIXED_POINT_SUPPORTED |
| PNG_EXTERN void png_ascii_from_fixed PNGARG((png_structp png_ptr, |
| png_charp ascii, png_size_t size, png_fixed_point fp)); |
| #endif /* FIXED_POINT */ |
| #endif /* READ_sCAL */ |
| |
| #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) |
| /* An internal API to validate the format of a floating point number. |
| * The result is the index of the next character. If the number is |
| * not valid it will be the index of a character in the supposed number. |
| * |
| * The format of a number is defined in the PNG extensions specification |
| * and this API is strictly conformant to that spec, not anyone elses! |
| * |
| * The format as a regular expression is: |
| * |
| * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? |
| * |
| * or: |
| * |
| * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? |
| * |
| * The complexity is that either integer or fraction must be present and the |
| * fraction is permitted to have no digits only if the integer is present. |
| * |
| * NOTE: The dangling E problem. |
| * There is a PNG valid floating point number in the following: |
| * |
| * PNG floating point numb1.ers are not greedy. |
| * |
| * Working this out requires *TWO* character lookahead (because of the |
| * sign), the parser does not do this - it will fail at the 'r' - this |
| * doesn't matter for PNG sCAL chunk values, but it requires more care |
| * if the value were ever to be embedded in something more complex. Use |
| * ANSI-C strtod if you need the lookahead. |
| */ |
| /* State table for the parser. */ |
| #define PNG_FP_INTEGER 0 /* before or in integer */ |
| #define PNG_FP_FRACTION 1 /* before or in fraction */ |
| #define PNG_FP_EXPONENT 2 /* before or in exponent */ |
| #define PNG_FP_STATE 3 /* mask for the above */ |
| #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ |
| #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ |
| #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ |
| #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ |
| #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ |
| #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ |
| #define PNG_FP_INVALID 128 /* Available for callers as a distinct value */ |
| |
| /* Result codes for the parser (boolean - true meants ok, false means |
| * not ok yet.) |
| */ |
| #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ |
| #define PNG_FP_OK 1 /* The number is valid */ |
| |
| /* The actual parser. This can be called repeatedly, it updates |
| * the index into the string and the state variable (which must |
| * be initialzed to 0). It returns a result code, as above. There |
| * is no point calling the parser any more if it fails to advance to |
| * the end of the string - it is stuck on an invalid character (or |
| * terminated by '\0'). |
| * |
| * Note that the pointer will consume an E or even an E+ then leave |
| * a 'maybe' state even though a preceding integer.fraction is valid. |
| * The PNG_FP_WAS_VALID flag indicates that a preceding substring was |
| * a valid number. It's possible to recover from this by calling |
| * the parser again (from the start, with state 0) but with a string |
| * that omits the last character (i.e. set the size to the index of |
| * the problem character.) This has not been tested within libpng. |
| */ |
| PNG_EXTERN int png_check_fp_number PNGARG((png_const_charp string, |
| png_size_t size, int *statep, png_size_tp whereami)); |
| |
| /* This is the same but it checks a complete string and returns true |
| * only if it just contains a floating point number. |
| */ |
| PNG_EXTERN int png_check_fp_string PNGARG((png_const_charp string, |
| png_size_t size)); |
| #endif /* pCAL || sCAL */ |
| |
| #if defined(PNG_READ_GAMMA_SUPPORTED) ||\ |
| defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) |
| /* Added at libpng version 1.5.0 */ |
| /* This is a utility to provide a*times/div (rounded) and indicate |
| * if there is an overflow. The result is a boolean - false (0) |
| * for overflow, true (1) if no overflow, in which case *res |
| * holds the result. |
| */ |
| PNG_EXTERN int png_muldiv PNGARG((png_fixed_point_p res, png_fixed_point a, |
| png_int_32 times, png_int_32 div)); |
| #endif |
| |
| #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) |
| /* Same deal, but issue a warning on overflow and return 0. */ |
| PNG_EXTERN png_fixed_point png_muldiv_warn PNGARG((png_structp png_ptr, |
| png_fixed_point a, png_int_32 times, png_int_32 div)); |
| #endif |
| |
| #ifdef PNG_READ_GAMMA_SUPPORTED |
| /* Calculate a reciprocal - used for gamma values. This returns |
| * 0 if the argument is 0 in order to maintain an undefined value, |
| * there are no warnings. |
| */ |
| PNG_EXTERN png_fixed_point png_reciprocal PNGARG((png_fixed_point a)); |
| |
| /* The same but gives a reciprocal of the product of two fixed point |
| * values. Accuracy is suitable for gamma calculations but this is |
| * not exact - use png_muldiv for that. |
| */ |
| PNG_EXTERN png_fixed_point png_reciprocal2 PNGARG((png_fixed_point a, |
| png_fixed_point b)); |
| #endif |
| |
| #ifdef PNG_READ_GAMMA_SUPPORTED |
| /* Internal fixed point gamma correction. These APIs are called as |
| * required to convert single values - they don't need to be fast, |
| * they are not used when processing image pixel values. |
| * |
| * While the input is an 'unsigned' value it must actually be the |
| * correct bit value - 0..255 or 0..65535 as required. |
| */ |
| PNG_EXTERN png_uint_16 png_gamma_correct PNGARG((png_structp png_ptr, |
| unsigned int value, png_fixed_point gamma)); |
| PNG_EXTERN int png_gamma_significant PNGARG((png_fixed_point gamma)); |
| PNG_EXTERN png_uint_16 png_gamma_16bit_correct PNGARG((unsigned int value, |
| png_fixed_point gamma)); |
| PNG_EXTERN png_byte png_gamma_8bit_correct PNGARG((unsigned int value, |
| png_fixed_point gamma)); |
| PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr, |
| int bit_depth)); |
| #endif |
| |
| /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ |
| |
| |
| #include "pngdebug.h" |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* PNGPRIV_H */ |
