diff options
Diffstat (limited to 'src/3rdparty/libpng/pngpriv.h')
| -rw-r--r-- | src/3rdparty/libpng/pngpriv.h | 303 |
1 files changed, 211 insertions, 92 deletions
diff --git a/src/3rdparty/libpng/pngpriv.h b/src/3rdparty/libpng/pngpriv.h index 9b90f26..ca2fb8c 100644 --- a/src/3rdparty/libpng/pngpriv.h +++ b/src/3rdparty/libpng/pngpriv.h @@ -6,7 +6,7 @@ * (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] + * Last changed in libpng 1.5.4 [July 7, 2011] * * This code is released under the libpng license. * For conditions of distribution and use, see the disclaimer @@ -29,6 +29,20 @@ # define _CRT_SECURE_NO_DEPRECATE #endif +/* Feature Test Macros. The following are defined here to ensure that correctly + * implemented libraries reveal the APIs libpng needs to build and hide those + * that are not needed and potentially damaging to the compilation. + * + * Feature Test Macros must be defined before any system header is included (see + * POSIX 1003.1 2.8.2 "POSIX Symbols." + * + * These macros only have an effect if the operating system supports either + * POSIX 1003.1 or C99, or both. On other operating systems (particularly + * Windows/Visual Studio) there is no effect; the OS specific tests below are + * still required (as of 2011-05-02.) + */ +#define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ + /* This is required for the definition of abort(), used as a last ditch * error handler when all else fails. */ @@ -87,13 +101,15 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp; # define PNG_MAX_MALLOC_64K #endif +#ifndef PNG_UNUSED /* Unused formal parameter warnings are silenced using the following macro * which is expected to have no bad effects on performance (optimizing * compilers will probably remove it entirely). Note that if you replace * it with something other than whitespace, you must include the terminating * semicolon. */ -#define PNG_UNUSED(param) (void)param; +# define PNG_UNUSED(param) (void)param; +#endif /* Just a little check that someone hasn't tried to define something * contradictory. @@ -103,12 +119,27 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp; # define PNG_ZBUF_SIZE 65536L #endif -/* If warnings or errors are turned off the code is disabled - * or redirected here. +/* PNG_STATIC is used to mark internal file scope functions if they need to be + * accessed for implementation tests (see the code in tests/?*). */ -#ifndef PNG_WARNINGS_SUPPORTED -# define png_warning(s1,s2) ((void)0) -# define png_chunk_warning(s1,s2) ((void)0) +#ifndef PNG_STATIC +# define PNG_STATIC static +#endif + +/* If warnings or errors are turned off the code is disabled or redirected here. + * From 1.5.4 functions have been added to allow very limited formatting of + * error and warning messages - this code will also be disabled here. + */ +#ifdef PNG_WARNINGS_SUPPORTED +# define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; +#else +# define png_warning(s1,s2) ((void)(s1)) +# define png_chunk_warning(s1,s2) ((void)(s1)) +# define png_warning_parameter(p,number,string) ((void)0) +# define png_warning_parameter_unsigned(p,number,format,value) ((void)0) +# define png_warning_parameter_signed(p,number,format,value) ((void)0) +# define png_formatted_warning(pp,p,message) ((void)(pp)) +# define PNG_WARNING_PARAMETERS(p) #endif #ifndef PNG_ERROR_TEXT_SUPPORTED # define png_error(s1,s2) png_err(s1) @@ -204,60 +235,28 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp; # 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 @@ -265,12 +264,14 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp; */ /* Various modes of operation. Note that after an init, mode is set to - * zero automatically when the structure is created. + * zero automatically when the structure is created. Three of these + * are defined in png.h because they need to be visible to applications + * that call png_set_unknown_chunk(). */ -#define PNG_HAVE_IHDR 0x01 -#define PNG_HAVE_PLTE 0x02 +/* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ +/* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ #define PNG_HAVE_IDAT 0x04 -#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ +/* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ #define PNG_HAVE_IEND 0x10 #define PNG_HAVE_gAMA 0x20 #define PNG_HAVE_cHRM 0x40 @@ -290,10 +291,10 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp; #define PNG_SWAP_BYTES 0x0010 #define PNG_INVERT_MONO 0x0020 #define PNG_QUANTIZE 0x0040 -#define PNG_BACKGROUND 0x0080 +#define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ #define PNG_BACKGROUND_EXPAND 0x0100 - /* 0x0200 unused */ -#define PNG_16_TO_8 0x0400 +#define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ +#define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ #define PNG_RGBA 0x0800 #define PNG_EXPAND 0x1000 #define PNG_GAMMA 0x2000 @@ -307,10 +308,10 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp; #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_ENCODE_ALPHA 0x800000L /* Added to libpng-1.5.4 */ #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ - /* 0x4000000L unused */ +#define PNG_SCALE_16_TO_8 0x4000000L /* Added to libpng-1.5.4 */ /* 0x8000000L unused */ /* 0x10000000L unused */ /* 0x20000000L unused */ @@ -337,25 +338,25 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp; #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_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ +#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ +#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ #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 */ + /* 0x200000L unused */ + /* 0x400000L unused */ #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_ZTXT_CUSTOM_STRATEGY 0x1000000L /* 5 lines added */ +#define PNG_FLAG_ZTXT_CUSTOM_LEVEL 0x2000000L /* to libpng-1.5.4 */ +#define PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL 0x4000000L +#define PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS 0x8000000L +#define PNG_FLAG_ZTXT_CUSTOM_METHOD 0x10000000L + /* 0x20000000L unused */ + /* 0x40000000L unused */ #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ PNG_FLAG_CRC_ANCILLARY_NOWARN) @@ -464,6 +465,11 @@ PNG_EXTERN png_fixed_point png_fixed PNGARG((png_structp png_ptr, double fp, #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'} +/* Gamma values (new at libpng-1.5.4): */ +#define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ +#define PNG_GAMMA_MAC_INVERSE 65909 +#define PNG_GAMMA_sRGB_INVERSE 45455 + /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ #ifdef __cplusplus @@ -476,6 +482,12 @@ extern "C" { * be found in the files where the functions are located. */ +/* Check the user version string for compatibility, returns false if the version + * numbers aren't compatible. + */ +PNG_EXTERN int png_user_version_check(png_structp png_ptr, + png_const_charp user_png_ver); + /* Allocate memory for an internal libpng struct */ PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct,PNGARG((int type)), PNG_ALLOCATED); @@ -544,8 +556,7 @@ 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) +#if defined(PNG_READ_COMPRESSED_TEXT_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)); @@ -648,6 +659,7 @@ PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_const_uint_16p hist, int num_hist)); #endif +/* Chunks that have keywords */ #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, @@ -738,17 +750,17 @@ PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 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)); + +#ifdef PNG_READ_TRANSFORMS_SUPPORTED /* Optional call to update the users info structure */ PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, png_infop info_ptr)); +#endif /* These are the functions that do the transformations */ #ifdef PNG_READ_FILLER_SUPPORTED @@ -778,8 +790,8 @@ PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, #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)); +PNG_EXTERN void png_do_strip_channel PNGARG((png_row_infop row_info, + png_bytep row, int at_start)); #endif #ifdef PNG_16BIT_SUPPORTED @@ -820,7 +832,12 @@ PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); #endif -#ifdef PNG_READ_16_TO_8_SUPPORTED +#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED +PNG_EXTERN void png_do_scale_16_to_8 PNGARG((png_row_infop row_info, + png_bytep row)); +#endif + +#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); #endif @@ -851,26 +868,20 @@ 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 +#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ + defined(PNG_READ_ALPHA_MODE_SUPPORTED) +PNG_EXTERN void png_do_compose PNGARG((png_row_infop row_info, + png_bytep row, png_structp png_ptr)); #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)); + png_bytep row, png_structp png_ptr)); +#endif + +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED +PNG_EXTERN void png_do_encode_alpha PNGARG((png_row_infop row_info, + png_bytep row, png_structp png_ptr)); #endif #ifdef PNG_READ_EXPAND_SUPPORTED @@ -881,6 +892,11 @@ PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, png_bytep row, png_const_color_16p trans_color)); #endif +#ifdef PNG_READ_EXPAND_16_SUPPORTED +PNG_EXTERN void png_do_expand_16 PNGARG((png_row_infop row_info, + png_bytep row)); +#endif + /* The following decodes the appropriate chunks, and does error correction, * then calls the appropriate callback for the chunk if it is valid. */ @@ -985,10 +1001,16 @@ PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, png_const_bytep chunk_name)); /* Handle the transformations for reading and writing */ +#ifdef PNG_READ_TRANSFORMS_SUPPORTED PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); +#endif +#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); +#endif +#ifdef PNG_READ_TRANSFORMS_SUPPORTED PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); +#endif #ifdef PNG_PROGRESSIVE_READ_SUPPORTED PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, @@ -1085,6 +1107,76 @@ PNG_EXTERN PNG_FUNCTION(void, png_fixed_error, (png_structp png_ptr, png_const_charp name),PNG_NORETURN); #endif +/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite + * the end. Always leaves the buffer nul terminated. Never errors out (and + * there is no error code.) + */ +PNG_EXTERN size_t png_safecat(png_charp buffer, size_t bufsize, size_t pos, + png_const_charp string); + +/* Various internal functions to handle formatted warning messages, currently + * only implemented for warnings. + */ +#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) +/* Utility to dump an unsigned value into a buffer, given a start pointer and + * and end pointer (which should point just *beyond* the end of the buffer!) + * Returns the pointer to the start of the formatted string. This utility only + * does unsigned values. + */ +PNG_EXTERN png_charp png_format_number(png_const_charp start, png_charp end, + int format, png_alloc_size_t number); + +/* Convenience macro that takes an array: */ +#define PNG_FORMAT_NUMBER(buffer,format,number) \ + png_format_number(buffer, buffer + (sizeof buffer), format, number) + +/* Suggested size for a number buffer (enough for 64 bits and a sign!) */ +#define PNG_NUMBER_BUFFER_SIZE 24 + +/* These are the integer formats currently supported, the name is formed from + * the standard printf(3) format string. + */ +#define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ +#define PNG_NUMBER_FORMAT_02u 2 +#define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ +#define PNG_NUMBER_FORMAT_02d 2 +#define PNG_NUMBER_FORMAT_x 3 +#define PNG_NUMBER_FORMAT_02x 4 +#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ +#endif + +#ifdef PNG_WARNINGS_SUPPORTED +/* New defines and members adding in libpng-1.5.4 */ +# define PNG_WARNING_PARAMETER_SIZE 32 +# define PNG_WARNING_PARAMETER_COUNT 8 + +/* An l-value of this type has to be passed to the APIs below to cache the + * values of the parameters to a formatted warning message. + */ +typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ + PNG_WARNING_PARAMETER_SIZE]; + +PNG_EXTERN void png_warning_parameter(png_warning_parameters p, int number, + png_const_charp string); + /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, + * including the trailing '\0'. + */ +PNG_EXTERN void png_warning_parameter_unsigned(png_warning_parameters p, + int number, int format, png_alloc_size_t value); + /* Use png_alloc_size_t because it is an unsigned type as big as any we + * need to output. Use the following for a signed value. + */ +PNG_EXTERN void png_warning_parameter_signed(png_warning_parameters p, + int number, int format, png_int_32 value); + +PNG_EXTERN void png_formatted_warning(png_structp png_ptr, + png_warning_parameters p, png_const_charp message); + /* 'message' follows the X/Open approach of using @1, @2 to insert + * parameters previously supplied using the above functions. Errors in + * specifying the paramters will simple result in garbage substitutions. + */ +#endif + /* ASCII to FP interfaces, currently only implemented if sCAL * support is required. */ @@ -1147,8 +1239,18 @@ PNG_EXTERN void png_ascii_from_fixed PNGARG((png_structp png_ptr, #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 */ + +/* These three values don't affect the parser. They are set but not used. + */ #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 */ +#define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ +#define PNG_FP_NONZERO 256 /* A non-zero value */ +#define PNG_FP_STICKY 448 /* The above three flags */ + +/* This is available for the caller to store in 'state' if required. Do not + * call the parser after setting it (the parser sometimes clears it.) + */ +#define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ /* Result codes for the parser (boolean - true meants ok, false means * not ok yet.) @@ -1156,6 +1258,20 @@ PNG_EXTERN void png_ascii_from_fixed PNGARG((png_structp png_ptr, #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ #define PNG_FP_OK 1 /* The number is valid */ +/* Tests on the sticky non-zero and negative flags. To pass these checks + * the state must also indicate that the whole number is valid - this is + * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this + * is equivalent to PNG_FP_OK above.) + */ +#define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) + /* NZ_MASK: the string is valid and a non-zero negative value */ +#define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) + /* Z MASK: the string is valid and a non-zero value. */ + /* PNG_FP_SAW_DIGIT: the string is valid. */ +#define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) +#define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) +#define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) + /* 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 @@ -1175,7 +1291,10 @@ 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. + * only if it just contains a floating point number. As of 1.5.4 this + * function also returns the state at the end of parsing the number if + * it was valid (otherwise it returns 0.) This can be used for testing + * for negative or zero values using the sticky flag. */ PNG_EXTERN int png_check_fp_string PNGARG((png_const_charp string, png_size_t size)); @@ -1190,13 +1309,13 @@ PNG_EXTERN int png_check_fp_string PNGARG((png_const_charp string, * 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)); + png_int_32 multiplied_by, png_int_32 divided_by)); #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)); + png_fixed_point a, png_int_32 multiplied_by, png_int_32 divided_by)); #endif #ifdef PNG_READ_GAMMA_SUPPORTED @@ -1223,12 +1342,12 @@ PNG_EXTERN png_fixed_point png_reciprocal2 PNGARG((png_fixed_point a, * 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)); + unsigned int value, png_fixed_point gamma_value)); +PNG_EXTERN int png_gamma_significant PNGARG((png_fixed_point gamma_value)); PNG_EXTERN png_uint_16 png_gamma_16bit_correct PNGARG((unsigned int value, - png_fixed_point gamma)); + png_fixed_point gamma_value)); PNG_EXTERN png_byte png_gamma_8bit_correct PNGARG((unsigned int value, - png_fixed_point gamma)); + png_fixed_point gamma_value)); PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr, int bit_depth)); #endif |