diff options
Diffstat (limited to 'src/3rdparty/libpng/png.h')
| -rw-r--r-- | src/3rdparty/libpng/png.h | 898 |
1 files changed, 642 insertions, 256 deletions
diff --git a/src/3rdparty/libpng/png.h b/src/3rdparty/libpng/png.h index 100f56dba2..4e0dee1793 100644 --- a/src/3rdparty/libpng/png.h +++ b/src/3rdparty/libpng/png.h @@ -1,8 +1,8 @@ /* png.h - header file for PNG reference library * - * libpng version 1.5.1 - February 3, 2011 - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * libpng version 1.5.10 - March 29, 2012 + * Copyright (c) 1998-2012 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.) * @@ -11,7 +11,7 @@ * Authors and maintainers: * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger - * libpng versions 0.97, January 1998, through 1.5.1 - February 3, 2011: Glenn + * libpng versions 0.97, January 1998, through 1.5.10 - March 29, 2012: Glenn * See also "Contributing Authors", below. * * Note about libpng version numbers: @@ -147,6 +147,33 @@ * 1.5.1beta01-11 15 10501 15.so.15.1[.0] * 1.5.1rc01-02 15 10501 15.so.15.1[.0] * 1.5.1 15 10501 15.so.15.1[.0] + * 1.5.2beta01-03 15 10502 15.so.15.2[.0] + * 1.5.2rc01-03 15 10502 15.so.15.2[.0] + * 1.5.2 15 10502 15.so.15.2[.0] + * 1.5.3beta01-10 15 10503 15.so.15.3[.0] + * 1.5.3rc01-02 15 10503 15.so.15.3[.0] + * 1.5.3beta11 15 10503 15.so.15.3[.0] + * 1.5.3 [omitted] + * 1.5.4beta01-08 15 10504 15.so.15.4[.0] + * 1.5.4rc01 15 10504 15.so.15.4[.0] + * 1.5.4 15 10504 15.so.15.4[.0] + * 1.5.5beta01-08 15 10505 15.so.15.5[.0] + * 1.5.5rc01 15 10505 15.so.15.5[.0] + * 1.5.5 15 10505 15.so.15.5[.0] + * 1.5.6beta01-07 15 10506 15.so.15.6[.0] + * 1.5.6rc01-03 15 10506 15.so.15.6[.0] + * 1.5.6 15 10506 15.so.15.6[.0] + * 1.5.7beta01-05 15 10507 15.so.15.7[.0] + * 1.5.7rc01-03 15 10507 15.so.15.7[.0] + * 1.5.7 15 10507 15.so.15.7[.0] + * 1.5.8beta01 15 10508 15.so.15.8[.0] + * 1.5.8rc01 15 10508 15.so.15.8[.0] + * 1.5.8 15 10508 15.so.15.8[.0] + * 1.5.9beta01-02 15 10509 15.so.15.9[.0] + * 1.5.9rc01 15 10509 15.so.15.9[.0] + * 1.5.9 15 10509 15.so.15.9[.0] + * 1.5.10beta01-05 15 10510 15.so.15.10[.0] + * 1.5.10 15 10510 15.so.15.10[.0] * * Henceforth the source version will match the shared-library major * and minor numbers; the shared-library major version number will be @@ -156,7 +183,7 @@ * to the source version x.y.z (leading zeros in y and z). Beta versions * were given the previous public release number plus a letter, until * version 1.0.6j; from then on they were given the upcoming public - * release number plus "betaNN" or "rcN". + * release number plus "betaNN" or "rcNN". * * Binary incompatibility exists only when applications make direct access * to the info_ptr or png_ptr members through png.h, and the compiled @@ -178,8 +205,8 @@ * * This code is released under the libpng license. * - * libpng versions 1.2.6, August 15, 2004, through 1.5.1, February 3, 2011, are - * Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are + * libpng versions 1.2.6, August 15, 2004, through 1.5.10, March 29, 2012, are + * Copyright (c) 2004, 2006-2012 Glenn Randers-Pehrson, and are * distributed according to the same disclaimer and license as libpng-1.2.5 * with the following individual added to the list of Contributing Authors: * @@ -205,7 +232,7 @@ * * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are - * distributed according to the same disclaimer and license as libpng-0.96, + * distributed according to the same disclaimer and license as libpng-0.96, * with the following individuals added to the list of Contributing Authors: * * Tom Lane @@ -214,7 +241,7 @@ * * libpng versions 0.89, June 1996, through 0.96, May 1997, are * Copyright (c) 1996, 1997 Andreas Dilger - * Distributed according to the same disclaimer and license as libpng-0.88, + * Distributed according to the same disclaimer and license as libpng-0.88, * with the following individuals added to the list of Contributing Authors: * * John Bowler @@ -237,10 +264,10 @@ * Tim Wegner * * The PNG Reference Library is supplied "AS IS". The Contributing Authors - * and Group 42, Inc. disclaim all warranties, expressed or implied, + * and Group 42, Inc. disclaim all warranties, expressed or implied, * including, without limitation, the warranties of merchantability and of * fitness for any purpose. The Contributing Authors and Group 42, Inc. - * assume no liability for direct, indirect, incidental, special, exemplary, + * assume no liability for direct, indirect, incidental, special, exemplary, * or consequential damages, which may result from the use of the PNG * Reference Library, even if advised of the possibility of such damage. * @@ -290,25 +317,24 @@ * Y2K compliance in libpng: * ========================= * - * February 3, 2011 + * March 29, 2012 * * Since the PNG Development group is an ad-hoc body, we can't make * an official declaration. * * This is your unofficial assurance that libpng from version 0.71 and - * upward through 1.5.1 are Y2K compliant. It is my belief that + * upward through 1.5.10 are Y2K compliant. It is my belief that * earlier versions were also Y2K compliant. * - * Libpng only has three year fields. One is a 2-byte unsigned integer - * that will hold years up to 65535. The other two hold the date in text + * Libpng only has two year fields. One is a 2-byte unsigned integer + * that will hold years up to 65535. The other holds the date in text * format, and will hold years up to 9999. * * The integer is * "png_uint_16 year" in png_time_struct. * - * The strings are - * "png_charp time_buffer" in png_struct and - * "near_time_buffer", which is a local character string in png.c. + * The string is + * "png_char time_buffer" in png_struct * * There are seven time-related functions: * png.c: png_convert_to_rfc_1123() in png.c @@ -326,7 +352,7 @@ * the full 4-digit year. There is a possibility that applications using * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() * function, or that they are incorrectly passing only a 2-digit year - * instead of "year - 1900" into the png_convert_from_struct_tm() function, + * instead of "year - 1900" into the png_convert_from_struct_tm() function, * but this is not under our control. The libpng documentation has always * stated that it works with 4-digit years, and the APIs have been * documented as such. @@ -349,12 +375,15 @@ * describes how to use libpng, and the file example.c summarizes it * with some code on which to build. This file is useful for looking * at the actual function definitions and structure components. + * + * If you just need to read a PNG file and don't want to read the documentation + * skip to the end of this file and read the section entitled 'simplified API'. */ /* Version information for png.h - this should match the version in png.c */ -#define PNG_LIBPNG_VER_STRING "1.5.1" +#define PNG_LIBPNG_VER_STRING "1.5.10" #define PNG_HEADER_VERSION_STRING \ - " libpng version 1.5.1 - February 3, 2011\n" + " libpng version 1.5.10 - March 29, 2012\n" #define PNG_LIBPNG_VER_SONUM 15 #define PNG_LIBPNG_VER_DLLNUM 15 @@ -362,7 +391,8 @@ /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ #define PNG_LIBPNG_VER_MAJOR 1 #define PNG_LIBPNG_VER_MINOR 5 -#define PNG_LIBPNG_VER_RELEASE 1 +#define PNG_LIBPNG_VER_RELEASE 10 + /* This should match the numeric part of the final component of * PNG_LIBPNG_VER_STRING, omitting any leading zero: */ @@ -384,7 +414,7 @@ #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with PNG_LIBPNG_BUILD_PRIVATE */ -#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA +#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE /* Careful here. At one time, Guy wanted to use 082, but that would be octal. * We must not include leading zeros. @@ -392,7 +422,7 @@ * version 1.0.0 was mis-numbered 100 instead of 10000). From * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */ -#define PNG_LIBPNG_VER 10501 /* 1.5.1 */ +#define PNG_LIBPNG_VER 10510 /* 1.5.10 */ /* Library configuration: these options cannot be changed after * the library has been built. @@ -405,19 +435,24 @@ #endif #ifndef PNG_VERSION_INFO_ONLY -/* Standard header files (not needed for the version info) */ -# ifdef PNG_SETJMP_SUPPORTED -# include <setjmp.h> +# ifndef PNG_BUILDING_SYMBOL_TABLE + /* + * Standard header files (not needed for the version info or while + * building symbol table -- see scripts/pnglibconf.dfa) + */ +# ifdef PNG_SETJMP_SUPPORTED +# include <setjmp.h> +# endif + + /* Need the time information for converting tIME chunks, it + * defines struct tm: + */ +# ifdef PNG_CONVERT_tIME_SUPPORTED + /* "time.h" functions are not supported on all operating systems */ +# include <time.h> +# endif # endif -/* Need the time information for converting tIME chunks, it - * defines struct tm: - */ -#ifdef PNG_CONVERT_tIME_SUPPORTED - /* "time.h" functions are not supported on all operating systems */ -# include <time.h> -#endif - /* Machine specific configuration. */ # include "pngconf.h" #endif @@ -509,7 +544,7 @@ extern "C" { /* This triggers a compiler error in png.c, if png.c and png.h * do not agree upon the version number. */ -typedef char* png_libpng_version_1_5_1; +typedef char* png_libpng_version_1_5_10; /* Three color definitions. The order of the red, green, and blue, (and the * exact size) is not important, although the size of the fields need to @@ -582,13 +617,22 @@ typedef PNG_CONST png_sPLT_t FAR * png_const_sPLT_tp; typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; #ifdef PNG_TEXT_SUPPORTED -/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, +/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, * and whether that contents is compressed or not. The "key" field - * points to a regular zero-terminated C string. The "text", "lang", and - * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. - * However, the * structure returned by png_get_text() will always contain - * regular zero-terminated C strings (possibly empty), never NULL pointers, - * so they can be safely used in printf() and other string-handling functions. + * points to a regular zero-terminated C string. The "text" fields can be a + * regular C string, an empty string, or a NULL pointer. + * However, the structure returned by png_get_text() will always contain + * the "text" field as a regular zero-terminated C string (possibly + * empty), never a NULL pointer, so it can be safely used in printf() and + * other string-handling functions. Note that the "itxt_length", "lang", and + * "lang_key" members of the structure only exist when the library is built + * with iTXt chunk support. Prior to libpng-1.4.0 the library was built by + * default without iTXt support. Also note that when iTXt *is* supported, + * the "lang" and "lang_key" fields contain NULL pointers when the + * "compression" field contains * PNG_TEXT_COMPRESSION_NONE or + * PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the + * same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag" + * which is always 0 or 1, or its "compression method" which is always 0. */ typedef struct png_text_struct { @@ -657,12 +701,24 @@ typedef struct png_unknown_chunk_t /* libpng-using applications should NOT directly modify this byte. */ png_byte location; /* mode of operation at read time */ } + + png_unknown_chunk; typedef png_unknown_chunk FAR * png_unknown_chunkp; typedef PNG_CONST png_unknown_chunk FAR * png_const_unknown_chunkp; typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; #endif +/* Values for the unknown chunk location byte */ + +#define PNG_HAVE_IHDR 0x01 +#define PNG_HAVE_PLTE 0x02 +#define PNG_AFTER_IDAT 0x08 + +/* The complete definition of png_info has, as of libpng-1.5.0, + * been moved into a separate header file that is not accessible to + * applications. Read libpng-manual.txt or libpng.3 for more info. + */ typedef struct png_info_def png_info; typedef png_info FAR * png_infop; typedef PNG_CONST png_info FAR * png_const_infop; @@ -678,6 +734,8 @@ typedef png_info FAR * FAR * png_infopp; */ #define PNG_FP_1 100000 #define PNG_FP_HALF 50000 +#define PNG_FP_MAX ((png_fixed_point)0x7fffffffL) +#define PNG_FP_MIN (-PNG_FP_MAX) /* These describe the color_type field in png_info. */ /* color type masks */ @@ -765,7 +823,7 @@ typedef png_info FAR * FAR * png_infopp; #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ -#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ +#define PNG_INFO_IDAT 0x8000 /* ESR, 1.0.6 */ /* This is used for the transformation routines, as some of them * change these values for the row. It also should enable using @@ -784,6 +842,14 @@ typedef struct png_row_info_struct typedef png_row_info FAR * png_row_infop; typedef png_row_info FAR * FAR * png_row_infopp; +/* The complete definition of png_struct has, as of libpng-1.5.0, + * been moved into a separate header file that is not accessible to + * applications. Read libpng-manual.txt or libpng.3 for more info. + */ +typedef struct png_struct_def png_struct; +typedef PNG_CONST png_struct FAR * png_const_structp; +typedef png_struct FAR * png_structp; + /* These are the function types for the I/O functions and for the functions * that allow the user to override the default I/O functions with his or her * own. The png_error_ptr type should match that of user-supplied warning @@ -792,61 +858,59 @@ typedef png_row_info FAR * FAR * png_row_infopp; * modify the buffer it is passed. The 'read' function, on the other hand, is * expected to return the read data in the buffer. */ -typedef struct png_struct_def png_struct; -typedef PNG_CONST png_struct FAR * png_const_structp; -typedef png_struct FAR * png_structp; - -typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp), ); -typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t), ); -typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp), ); -typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32, - int), ); -typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32, - int), ); +typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp)); +typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t)); +typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp)); +typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32, + int)); +typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32, + int)); #ifdef PNG_PROGRESSIVE_READ_SUPPORTED -typedef PNG_CALLBACK(void, *png_progressive_info_ptr, - (png_structp, png_infop), ); -typedef PNG_CALLBACK(void, *png_progressive_end_ptr, - (png_structp, png_infop), ); -typedef PNG_CALLBACK(void, *png_progressive_row_ptr, - (png_structp, png_bytep, png_uint_32, int), ); +typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop)); +typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop)); + +/* The following callback receives png_uint_32 row_number, int pass for the + * png_bytep data of the row. When transforming an interlaced image the + * row number is the row number within the sub-image of the interlace pass, so + * the value will increase to the height of the sub-image (not the full image) + * then reset to 0 for the next pass. + * + * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to + * find the output pixel (x,y) given an interlaced sub-image pixel + * (row,col,pass). (See below for these macros.) + */ +typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep, + png_uint_32, int)); #endif #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) -typedef PNG_CALLBACK(void, *png_user_transform_ptr, - (png_structp, png_row_infop, png_bytep), ); +typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop, + png_bytep)); #endif #ifdef PNG_USER_CHUNKS_SUPPORTED -typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp, - png_unknown_chunkp), ); +typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp, + png_unknown_chunkp)); #endif #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED -typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp), ); +typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp)); #endif #ifdef PNG_SETJMP_SUPPORTED -/* This must match the function definition in <setjmp.h>, and the - * application must include this before png.h to obtain the definition - * of jmp_buf. The function is required to be PNG_NORETURN. (Note that - * PNG_PTR_NORETURN is used here because current versions of the Microsoft - * C compiler do not support the PNG_NORETURN attribute on a pointer.) - * - * If you get a type warning from the compiler when linking against this line - * then your compiler has 'longjmp' that does not match the requirements of the - * compiler that built libpng. You will have to write a wrapper function for - * your compiler's longjmp and call png_set_longjmp_fn directly (not via the - * png_jmpbuf macro.) - * - * If you get a warning here while building the library you will need to make +/* This must match the function definition in <setjmp.h>, and the application + * must include this before png.h to obtain the definition of jmp_buf. The + * function is required to be PNG_NORETURN, but this is not checked. If the + * function does return the application will crash via an abort() or similar + * system level call. + * + * If you get a warning here while building the library you may need to make * changes to ensure that pnglibconf.h records the calling convention used by * your compiler. This may be very difficult - try using a different compiler * to build the library! */ -typedef PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), - PNG_PTR_NORETURN); +PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef); #endif /* Transform masks for the high-level interface */ @@ -868,21 +932,24 @@ typedef PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ /* Added to libpng-1.4.0 */ #define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ +/* Added to libpng-1.5.4 */ +#define PNG_TRANSFORM_EXPAND_16 0x4000 /* read only */ +#define PNG_TRANSFORM_SCALE_16 0x8000 /* read only */ /* Flags for MNG supported features */ #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 #define PNG_FLAG_MNG_FILTER_64 0x04 #define PNG_ALL_MNG_FEATURES 0x05 -/* NOTE: prior to 1.5 these functions had no 'API' style declaration, +/* NOTE: prior to 1.5 these functions had no 'API' style declaration, * this allowed the zlib default functions to be used on Windows * platforms. In 1.5 the zlib default malloc (which just calls malloc and * ignores the first argument) should be completely compatible with the * following. */ -typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp, - png_alloc_size_t), ); -typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp), ); +typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp, + png_alloc_size_t)); +typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp)); typedef png_struct FAR * FAR * png_structpp; @@ -928,7 +995,7 @@ PNG_EXPORT(2, void, png_set_sig_bytes, (png_structp png_ptr, int num_bytes)); * signature, and non-zero otherwise. Having num_to_check == 0 or * start > 7 will always fail (ie return non-zero). */ -PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start, +PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start, png_size_t num_to_check)); /* Simple signature checking function. This is the same as calling @@ -939,19 +1006,19 @@ PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start, /* Allocate and initialize png_ptr struct for reading, and any other memory. */ PNG_EXPORTA(4, png_structp, png_create_read_struct, (png_const_charp user_png_ver, png_voidp error_ptr, - png_error_ptr error_fn, png_error_ptr warn_fn), + png_error_ptr error_fn, png_error_ptr warn_fn), PNG_ALLOCATED); /* Allocate and initialize png_ptr struct for writing, and any other memory */ PNG_EXPORTA(5, png_structp, png_create_write_struct, (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, - png_error_ptr warn_fn), + png_error_ptr warn_fn), PNG_ALLOCATED); PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size, (png_const_structp png_ptr)); -PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structp png_ptr, +PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structp png_ptr, png_size_t size)); /* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp @@ -965,7 +1032,7 @@ PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structp png_ptr, * allocated by the library - the call will return NULL on a mismatch * indicating an ABI mismatch. */ -PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structp png_ptr, +PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structp png_ptr, png_longjmp_ptr longjmp_fn, size_t jmp_buf_size)); # define png_jmpbuf(png_ptr) \ (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf))) @@ -990,13 +1057,13 @@ PNG_EXPORT(10, int, png_reset_zstream, (png_structp png_ptr)); #ifdef PNG_USER_MEM_SUPPORTED PNG_EXPORTA(11, png_structp, png_create_read_struct_2, (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, - png_error_ptr warn_fn, - png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), + png_error_ptr warn_fn, + png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), PNG_ALLOCATED); PNG_EXPORTA(12, png_structp, png_create_write_struct_2, (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, - png_error_ptr warn_fn, - png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), + png_error_ptr warn_fn, + png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), PNG_ALLOCATED); #endif @@ -1008,7 +1075,7 @@ PNG_EXPORT(14, void, png_write_chunk, (png_structp png_ptr, png_const_bytep chunk_name, png_const_bytep data, png_size_t length)); /* Write the start of a PNG chunk - length and chunk name. */ -PNG_EXPORT(15, void, png_write_chunk_start, (png_structp png_ptr, +PNG_EXPORT(15, void, png_write_chunk_start, (png_structp png_ptr, png_const_bytep chunk_name, png_uint_32 length)); /* Write the data of a PNG chunk started with png_write_chunk_start(). */ @@ -1019,10 +1086,10 @@ PNG_EXPORT(16, void, png_write_chunk_data, (png_structp png_ptr, PNG_EXPORT(17, void, png_write_chunk_end, (png_structp png_ptr)); /* Allocate and initialize the info structure */ -PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_structp png_ptr), +PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_structp png_ptr), PNG_ALLOCATED); -PNG_EXPORT(19, void, png_info_init_3, (png_infopp info_ptr, +PNG_EXPORT(19, void, png_info_init_3, (png_infopp info_ptr, png_size_t png_info_struct_size)); /* Writes all the PNG information before the image. */ @@ -1039,13 +1106,13 @@ PNG_EXPORT(22, void, png_read_info, #ifdef PNG_TIME_RFC1123_SUPPORTED PNG_EXPORT(23, png_const_charp, png_convert_to_rfc1123, - (png_structp png_ptr, + (png_structp png_ptr, png_const_timep ptime)); #endif #ifdef PNG_CONVERT_tIME_SUPPORTED /* Convert from a struct tm to png_time */ -PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime, +PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime, PNG_CONST struct tm FAR * ttime)); /* Convert from time_t to png_time. Uses gmtime() */ @@ -1061,6 +1128,13 @@ PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structp png_ptr)); PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structp png_ptr)); #endif +#ifdef PNG_READ_EXPAND_16_SUPPORTED +/* Expand to 16-bit channels, forces conversion of palette to RGB and expansion + * of a tRNS chunk if present. + */ +PNG_EXPORT(221, void, png_set_expand_16, (png_structp png_ptr)); +#endif + #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) /* Use blue, green, red order for pixels. */ PNG_EXPORT(30, void, png_set_bgr, (png_structp png_ptr)); @@ -1073,17 +1147,233 @@ PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structp png_ptr)); #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED /* Reduce RGB to grayscale. */ +#define PNG_ERROR_ACTION_NONE 1 +#define PNG_ERROR_ACTION_WARN 2 +#define PNG_ERROR_ACTION_ERROR 3 +#define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/ + PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structp png_ptr, int error_action, double red, double green)); -PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structp png_ptr, +PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structp png_ptr, int error_action, png_fixed_point red, png_fixed_point green)); PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structp png_ptr)); #endif -PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth, +#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED +PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth, png_colorp palette)); +#endif + +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED +/* How the alpha channel is interpreted - this affects how the color channels of + * a PNG file are returned when an alpha channel, or tRNS chunk in a palette + * file, is present. + * + * This has no effect on the way pixels are written into a PNG output + * datastream. The color samples in a PNG datastream are never premultiplied + * with the alpha samples. + * + * The default is to return data according to the PNG specification: the alpha + * channel is a linear measure of the contribution of the pixel to the + * corresponding composited pixel. The gamma encoded color channels must be + * scaled according to the contribution and to do this it is necessary to undo + * the encoding, scale the color values, perform the composition and reencode + * the values. This is the 'PNG' mode. + * + * The alternative is to 'associate' the alpha with the color information by + * storing color channel values that have been scaled by the alpha. The + * advantage is that the color channels can be resampled (the image can be + * scaled) in this form. The disadvantage is that normal practice is to store + * linear, not (gamma) encoded, values and this requires 16-bit channels for + * still images rather than the 8-bit channels that are just about sufficient if + * gamma encoding is used. In addition all non-transparent pixel values, + * including completely opaque ones, must be gamma encoded to produce the final + * image. This is the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' mode (the + * latter being the two common names for associated alpha color channels.) + * + * Since it is not necessary to perform arithmetic on opaque color values so + * long as they are not to be resampled and are in the final color space it is + * possible to optimize the handling of alpha by storing the opaque pixels in + * the PNG format (adjusted for the output color space) while storing partially + * opaque pixels in the standard, linear, format. The accuracy required for + * standard alpha composition is relatively low, because the pixels are + * isolated, therefore typically the accuracy loss in storing 8-bit linear + * values is acceptable. (This is not true if the alpha channel is used to + * simulate transparency over large areas - use 16 bits or the PNG mode in + * this case!) This is the 'OPTIMIZED' mode. For this mode a pixel is + * treated as opaque only if the alpha value is equal to the maximum value. + * + * The final choice is to gamma encode the alpha channel as well. This is + * broken because, in practice, no implementation that uses this choice + * correctly undoes the encoding before handling alpha composition. Use this + * choice only if other serious errors in the software or hardware you use + * mandate it; the typical serious error is for dark halos to appear around + * opaque areas of the composited PNG image because of arithmetic overflow. + * + * The API function png_set_alpha_mode specifies which of these choices to use + * with an enumerated 'mode' value and the gamma of the required output: + */ +#define PNG_ALPHA_PNG 0 /* according to the PNG standard */ +#define PNG_ALPHA_STANDARD 1 /* according to Porter/Duff */ +#define PNG_ALPHA_ASSOCIATED 1 /* as above; this is the normal practice */ +#define PNG_ALPHA_PREMULTIPLIED 1 /* as above */ +#define PNG_ALPHA_OPTIMIZED 2 /* 'PNG' for opaque pixels, else 'STANDARD' */ +#define PNG_ALPHA_BROKEN 3 /* the alpha channel is gamma encoded */ + +PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structp png_ptr, int mode, + double output_gamma)); +PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structp png_ptr, + int mode, png_fixed_point output_gamma)); +#endif + +#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED) +/* The output_gamma value is a screen gamma in libpng terminology: it expresses + * how to decode the output values, not how they are encoded. The values used + * correspond to the normal numbers used to describe the overall gamma of a + * computer display system; for example 2.2 for an sRGB conformant system. The + * values are scaled by 100000 in the _fixed version of the API (so 220000 for + * sRGB.) + * + * The inverse of the value is always used to provide a default for the PNG file + * encoding if it has no gAMA chunk and if png_set_gamma() has not been called + * to override the PNG gamma information. + * + * When the ALPHA_OPTIMIZED mode is selected the output gamma is used to encode + * opaque pixels however pixels with lower alpha values are not encoded, + * regardless of the output gamma setting. + * + * When the standard Porter Duff handling is requested with mode 1 the output + * encoding is set to be linear and the output_gamma value is only relevant + * as a default for input data that has no gamma information. The linear output + * encoding will be overridden if png_set_gamma() is called - the results may be + * highly unexpected! + * + * The following numbers are derived from the sRGB standard and the research + * behind it. sRGB is defined to be approximated by a PNG gAMA chunk value of + * 0.45455 (1/2.2) for PNG. The value implicitly includes any viewing + * correction required to take account of any differences in the color + * environment of the original scene and the intended display environment; the + * value expresses how to *decode* the image for display, not how the original + * data was *encoded*. + * + * sRGB provides a peg for the PNG standard by defining a viewing environment. + * sRGB itself, and earlier TV standards, actually use a more complex transform + * (a linear portion then a gamma 2.4 power law) than PNG can express. (PNG is + * limited to simple power laws.) By saying that an image for direct display on + * an sRGB conformant system should be stored with a gAMA chunk value of 45455 + * (11.3.3.2 and 11.3.3.5 of the ISO PNG specification) the PNG specification + * makes it possible to derive values for other display systems and + * environments. + * + * The Mac value is deduced from the sRGB based on an assumption that the actual + * extra viewing correction used in early Mac display systems was implemented as + * a power 1.45 lookup table. + * + * Any system where a programmable lookup table is used or where the behavior of + * the final display device characteristics can be changed requires system + * specific code to obtain the current characteristic. However this can be + * difficult and most PNG gamma correction only requires an approximate value. + * + * By default, if png_set_alpha_mode() is not called, libpng assumes that all + * values are unencoded, linear, values and that the output device also has a + * linear characteristic. This is only very rarely correct - it is invariably + * better to call png_set_alpha_mode() with PNG_DEFAULT_sRGB than rely on the + * default if you don't know what the right answer is! + * + * The special value PNG_GAMMA_MAC_18 indicates an older Mac system (pre Mac OS + * 10.6) which used a correction table to implement a somewhat lower gamma on an + * otherwise sRGB system. + * + * Both these values are reserved (not simple gamma values) in order to allow + * more precise correction internally in the future. + * + * NOTE: the following values can be passed to either the fixed or floating + * point APIs, but the floating point API will also accept floating point + * values. + */ +#define PNG_DEFAULT_sRGB -1 /* sRGB gamma and color space */ +#define PNG_GAMMA_MAC_18 -2 /* Old Mac '1.8' gamma and color space */ +#define PNG_GAMMA_sRGB 220000 /* Television standards--matches sRGB gamma */ +#define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */ +#endif + +/* The following are examples of calls to png_set_alpha_mode to achieve the + * required overall gamma correction and, where necessary, alpha + * premultiplication. + * + * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); + * This is the default libpng handling of the alpha channel - it is not + * pre-multiplied into the color components. In addition the call states + * that the output is for a sRGB system and causes all PNG files without gAMA + * chunks to be assumed to be encoded using sRGB. + * + * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); + * In this case the output is assumed to be something like an sRGB conformant + * display preceeded by a power-law lookup table of power 1.45. This is how + * early Mac systems behaved. + * + * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR); + * This is the classic Jim Blinn approach and will work in academic + * environments where everything is done by the book. It has the shortcoming + * of assuming that input PNG data with no gamma information is linear - this + * is unlikely to be correct unless the PNG files where generated locally. + * Most of the time the output precision will be so low as to show + * significant banding in dark areas of the image. + * + * png_set_expand_16(pp); + * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB); + * This is a somewhat more realistic Jim Blinn inspired approach. PNG files + * are assumed to have the sRGB encoding if not marked with a gamma value and + * the output is always 16 bits per component. This permits accurate scaling + * and processing of the data. If you know that your input PNG files were + * generated locally you might need to replace PNG_DEFAULT_sRGB with the + * correct value for your system. + * + * png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB); + * If you just need to composite the PNG image onto an existing background + * and if you control the code that does this you can use the optimization + * setting. In this case you just copy completely opaque pixels to the + * output. For pixels that are not completely transparent (you just skip + * those) you do the composition math using png_composite or png_composite_16 + * below then encode the resultant 8-bit or 16-bit values to match the output + * encoding. + * + * Other cases + * If neither the PNG nor the standard linear encoding work for you because + * of the software or hardware you use then you have a big problem. The PNG + * case will probably result in halos around the image. The linear encoding + * will probably result in a washed out, too bright, image (it's actually too + * contrasty.) Try the ALPHA_OPTIMIZED mode above - this will probably + * substantially reduce the halos. Alternatively try: + * + * png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB); + * This option will also reduce the halos, but there will be slight dark + * halos round the opaque parts of the image where the background is light. + * In the OPTIMIZED mode the halos will be light halos where the background + * is dark. Take your pick - the halos are unavoidable unless you can get + * your hardware/software fixed! (The OPTIMIZED approach is slightly + * faster.) + * + * When the default gamma of PNG files doesn't match the output gamma. + * If you have PNG files with no gamma information png_set_alpha_mode allows + * you to provide a default gamma, but it also sets the ouput gamma to the + * matching value. If you know your PNG files have a gamma that doesn't + * match the output you can take advantage of the fact that + * png_set_alpha_mode always sets the output gamma but only sets the PNG + * default if it is not already set: + * + * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); + * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); + * The first call sets both the default and the output gamma values, the + * second call overrides the output gamma without changing the default. This + * is easier than achieving the same effect with png_set_gamma. You must use + * PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will + * fire if more than one call to png_set_alpha_mode and png_set_background is + * made in the same read operation, however multiple calls with PNG_ALPHA_PNG + * are ignored. + */ #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED PNG_EXPORT(36, void, png_set_strip_alpha, (png_structp png_ptr)); @@ -1101,14 +1391,14 @@ PNG_EXPORT(38, void, png_set_invert_alpha, (png_structp png_ptr)); #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ -PNG_EXPORT(39, void, png_set_filler, (png_structp png_ptr, png_uint_32 filler, +PNG_EXPORT(39, void, png_set_filler, (png_structp png_ptr, png_uint_32 filler, int flags)); /* The values of the PNG_FILLER_ defines should NOT be changed */ # define PNG_FILLER_BEFORE 0 # define PNG_FILLER_AFTER 1 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ PNG_EXPORT(40, void, png_set_add_alpha, - (png_structp png_ptr, png_uint_32 filler, + (png_structp png_ptr, png_uint_32 filler, int flags)); #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ @@ -1151,12 +1441,16 @@ PNG_EXPORT(46, void, png_set_invert_mono, (png_structp png_ptr)); #endif #ifdef PNG_READ_BACKGROUND_SUPPORTED -/* Handle alpha and tRNS by replacing with a background color. */ -PNG_FP_EXPORT(47, void, png_set_background, (png_structp png_ptr, - png_const_color_16p background_color, int background_gamma_code, +/* Handle alpha and tRNS by replacing with a background color. Prior to + * libpng-1.5.4 this API must not be called before the PNG file header has been + * read. Doing so will result in unexpected behavior and possible warnings or + * errors if the PNG file contains a bKGD chunk. + */ +PNG_FP_EXPORT(47, void, png_set_background, (png_structp png_ptr, + png_const_color_16p background_color, int background_gamma_code, int need_expand, double background_gamma)); PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structp png_ptr, - png_const_color_16p background_color, int background_gamma_code, + png_const_color_16p background_color, int background_gamma_code, int need_expand, png_fixed_point background_gamma)); #endif #ifdef PNG_READ_BACKGROUND_SUPPORTED @@ -1166,7 +1460,13 @@ PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structp png_ptr, # define PNG_BACKGROUND_GAMMA_UNIQUE 3 #endif -#ifdef PNG_READ_16_TO_8_SUPPORTED +#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED +/* Scale a 16-bit depth file down to 8-bit, accurately. */ +PNG_EXPORT(229, void, png_set_scale_16, (png_structp png_ptr)); +#endif + +#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED +#define PNG_READ_16_TO_8 SUPPORTED /* Name prior to 1.5.4 */ /* Strip the second byte of information from a 16-bit depth file. */ PNG_EXPORT(48, void, png_set_strip_16, (png_structp png_ptr)); #endif @@ -1176,8 +1476,8 @@ PNG_EXPORT(48, void, png_set_strip_16, (png_structp png_ptr)); * available. */ PNG_EXPORT(49, void, png_set_quantize, - (png_structp png_ptr, png_colorp palette, - int num_palette, int maximum_colors, png_const_uint_16p histogram, + (png_structp png_ptr, png_colorp palette, + int num_palette, int maximum_colors, png_const_uint_16p histogram, int full_quantize)); #endif @@ -1187,12 +1487,22 @@ PNG_EXPORT(49, void, png_set_quantize, */ #define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001) -/* Handle gamma correction. Screen_gamma=(display_exponent) */ +/* Handle gamma correction. Screen_gamma=(display_exponent). + * NOTE: this API simply sets the screen and file gamma values. It will + * therefore override the value for gamma in a PNG file if it is called after + * the file header has been read - use with care - call before reading the PNG + * file for best results! + * + * These routines accept the same gamma values as png_set_alpha_mode (described + * above). The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either + * API (floating point or fixed.) Notice, however, that the 'file_gamma' value + * is the inverse of a 'screen gamma' value. + */ PNG_FP_EXPORT(50, void, png_set_gamma, - (png_structp png_ptr, double screen_gamma, - double default_file_gamma)); -PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structp png_ptr, - png_fixed_point screen_gamma, png_fixed_point default_file_gamma)); + (png_structp png_ptr, double screen_gamma, + double override_file_gamma)); +PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structp png_ptr, + png_fixed_point screen_gamma, png_fixed_point override_file_gamma)); #endif #ifdef PNG_WRITE_FLUSH_SUPPORTED @@ -1211,13 +1521,13 @@ PNG_EXPORT(54, void, png_read_update_info, #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read one or more rows of image data. */ -PNG_EXPORT(55, void, png_read_rows, (png_structp png_ptr, png_bytepp row, +PNG_EXPORT(55, void, png_read_rows, (png_structp png_ptr, png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); #endif #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read a row of data. */ -PNG_EXPORT(56, void, png_read_row, (png_structp png_ptr, png_bytep row, +PNG_EXPORT(56, void, png_read_row, (png_structp png_ptr, png_bytep row, png_bytep display_row)); #endif @@ -1235,7 +1545,7 @@ PNG_EXPORT(58, void, png_write_row, * of libpng and to allow the 'display_row' array from read_rows to be passed * unchanged to write_rows. */ -PNG_EXPORT(59, void, png_write_rows, (png_structp png_ptr, png_bytepp row, +PNG_EXPORT(59, void, png_write_rows, (png_structp png_ptr, png_bytepp row, png_uint_32 num_rows)); /* Write the image data */ @@ -1252,15 +1562,15 @@ PNG_EXPORT(62, void, png_read_end, (png_structp png_ptr, png_infop info_ptr)); #endif /* Free any memory associated with the png_info_struct */ -PNG_EXPORT(63, void, png_destroy_info_struct, (png_structp png_ptr, +PNG_EXPORT(63, void, png_destroy_info_struct, (png_structp png_ptr, png_infopp info_ptr_ptr)); /* Free any memory associated with the png_struct and the png_info_structs */ -PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr, +PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); /* Free any memory associated with the png_struct and the png_info_structs */ -PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr, +PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); /* Set the libpng method of handling chunk CRC errors */ @@ -1270,7 +1580,7 @@ PNG_EXPORT(66, void, png_set_crc_action, /* Values for png_set_crc_action() say how to handle CRC errors in * ancillary and critical chunks, and whether to use the data contained * therein. Note that it is impossible to "discard" data in a critical - * chunk. For versions prior to 0.90, the action was always error/quit, + * chunk. For versions prior to 0.90, the action was always error/quit, * whereas in version 0.90 and later, the action for CRC errors in ancillary * chunks is warn/discard. These values should NOT be changed. * @@ -1350,11 +1660,11 @@ PNG_EXPORT(67, void, png_set_filter, * the weights and costs are set to 1.0, this degenerates the WEIGHTED method * to the UNWEIGHTED method, but with added encoding time/computation. */ -PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structp png_ptr, - int heuristic_method, int num_weights, png_const_doublep filter_weights, +PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structp png_ptr, + int heuristic_method, int num_weights, png_const_doublep filter_weights, png_const_doublep filter_costs)); PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed, - (png_structp png_ptr, + (png_structp png_ptr, int heuristic_method, int num_weights, png_const_fixed_point_p filter_weights, png_const_fixed_point_p filter_costs)); #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ @@ -1367,30 +1677,56 @@ PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed, #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ +#ifdef PNG_WRITE_SUPPORTED /* Set the library compression level. Currently, valid values range from * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 * (0 - no compression, 9 - "maximal" compression). Note that tests have * shown that zlib compression levels 3-6 usually perform as well as level 9 - * for PNG images, and do considerably fewer caclulations. In the future, + * for PNG images, and do considerably fewer caclulations. In the future, * these values may not correspond directly to the zlib compression levels. */ PNG_EXPORT(69, void, png_set_compression_level, (png_structp png_ptr, int level)); -PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structp png_ptr, +PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structp png_ptr, int mem_level)); -PNG_EXPORT(71, void, png_set_compression_strategy, (png_structp png_ptr, +PNG_EXPORT(71, void, png_set_compression_strategy, (png_structp png_ptr, int strategy)); -PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structp png_ptr, +/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a + * smaller value of window_bits if it can do so safely. + */ +PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structp png_ptr, int window_bits)); PNG_EXPORT(73, void, png_set_compression_method, (png_structp png_ptr, int method)); +#endif + +#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED +/* Also set zlib parameters for compressing non-IDAT chunks */ +PNG_EXPORT(222, void, png_set_text_compression_level, + (png_structp png_ptr, int level)); + +PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structp png_ptr, + int mem_level)); + +PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structp png_ptr, + int strategy)); + +/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a + * smaller value of window_bits if it can do so safely. + */ +PNG_EXPORT(225, void, png_set_text_compression_window_bits, (png_structp + png_ptr, int window_bits)); + +PNG_EXPORT(226, void, png_set_text_compression_method, (png_structp png_ptr, + int method)); +#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */ /* These next functions are called for input/output, memory, and error - * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, + * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, * and call standard C I/O routines such as fread(), fwrite(), and * fprintf(). These functions can be made to use other I/O routines * at run time for those applications that need to handle I/O in a @@ -1412,7 +1748,7 @@ PNG_EXPORT(74, void, png_init_io, (png_structp png_ptr, png_FILE_p fp)); */ PNG_EXPORT(75, void, png_set_error_fn, - (png_structp png_ptr, png_voidp error_ptr, + (png_structp png_ptr, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); /* Return the user pointer associated with the error functions */ @@ -1428,43 +1764,43 @@ PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structp png_ptr)); * default flush function, which uses the standard *FILE structure, will * be used. */ -PNG_EXPORT(77, void, png_set_write_fn, (png_structp png_ptr, png_voidp io_ptr, +PNG_EXPORT(77, void, png_set_write_fn, (png_structp png_ptr, png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); /* Replace the default data input function with a user supplied one. */ -PNG_EXPORT(78, void, png_set_read_fn, (png_structp png_ptr, png_voidp io_ptr, +PNG_EXPORT(78, void, png_set_read_fn, (png_structp png_ptr, png_voidp io_ptr, png_rw_ptr read_data_fn)); /* Return the user pointer associated with the I/O functions */ PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_structp png_ptr)); -PNG_EXPORT(80, void, png_set_read_status_fn, (png_structp png_ptr, +PNG_EXPORT(80, void, png_set_read_status_fn, (png_structp png_ptr, png_read_status_ptr read_row_fn)); -PNG_EXPORT(81, void, png_set_write_status_fn, (png_structp png_ptr, +PNG_EXPORT(81, void, png_set_write_status_fn, (png_structp png_ptr, png_write_status_ptr write_row_fn)); #ifdef PNG_USER_MEM_SUPPORTED /* Replace the default memory allocation functions with user supplied one(s). */ -PNG_EXPORT(82, void, png_set_mem_fn, (png_structp png_ptr, png_voidp mem_ptr, +PNG_EXPORT(82, void, png_set_mem_fn, (png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); /* Return the user pointer associated with the memory functions */ PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structp png_ptr)); #endif #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED -PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structp png_ptr, +PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structp png_ptr, png_user_transform_ptr read_user_transform_fn)); #endif #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED -PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structp png_ptr, +PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structp png_ptr, png_user_transform_ptr write_user_transform_fn)); #endif #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED -PNG_EXPORT(86, void, png_set_user_transform_info, (png_structp png_ptr, - png_voidp user_transform_ptr, int user_transform_depth, +PNG_EXPORT(86, void, png_set_user_transform_info, (png_structp png_ptr, + png_voidp user_transform_ptr, int user_transform_depth, int user_transform_channels)); /* Return the user pointer associated with the user transform functions */ PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr, @@ -1475,16 +1811,20 @@ PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr, /* Return information about the row currently being processed. Note that these * APIs do not fail but will return unexpected results if called outside a user * transform callback. Also note that when transforming an interlaced image the - * row number is still the row in the final, de-interlaced, image but the row - * only contains the data of the current pass - consult png_row_info for the - * actual width of the row! + * row number is the row number within the sub-image of the interlace pass, so + * the value will increase to the height of the sub-image (not the full image) + * then reset to 0 for the next pass. + * + * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to + * find the output pixel (x,y) given an interlaced sub-image pixel + * (row,col,pass). (See below for these macros.) */ PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structp)); PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structp)); #endif #ifdef PNG_USER_CHUNKS_SUPPORTED -PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structp png_ptr, +PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structp png_ptr, png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structp png_ptr)); #endif @@ -1493,8 +1833,8 @@ PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structp png_ptr)); /* Sets the function callbacks for the push reader, and a pointer to a * user-defined structure available to the callback functions. */ -PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structp png_ptr, - png_voidp progressive_ptr, png_progressive_info_ptr info_fn, +PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structp png_ptr, + png_voidp progressive_ptr, png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn)); /* Returns the user pointer associated with the push read functions */ @@ -1502,7 +1842,7 @@ PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, (png_const_structp png_ptr)); /* Function to be called when data becomes available */ PNG_EXPORT(92, void, png_process_data, - (png_structp png_ptr, png_infop info_ptr, + (png_structp png_ptr, png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); /* A function which may be called *only* within png_process_data to stop the @@ -1522,25 +1862,27 @@ PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structp, int save)); */ PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structp)); +#ifdef PNG_READ_INTERLACING_SUPPORTED /* Function that combines rows. 'new_row' is a flag that should come from * the callback and be non-NULL if anything needs to be done; the library * stores its own version of the new data internally and ignores the passed * in value. */ -PNG_EXPORT(93, void, png_progressive_combine_row, (png_structp png_ptr, +PNG_EXPORT(93, void, png_progressive_combine_row, (png_structp png_ptr, png_bytep old_row, png_const_bytep new_row)); +#endif /* PNG_READ_INTERLACING_SUPPORTED */ #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ PNG_EXPORTA(94, png_voidp, png_malloc, - (png_structp png_ptr, png_alloc_size_t size), + (png_structp png_ptr, png_alloc_size_t size), PNG_ALLOCATED); /* Added at libpng version 1.4.0 */ PNG_EXPORTA(95, png_voidp, png_calloc, - (png_structp png_ptr, png_alloc_size_t size), + (png_structp png_ptr, png_alloc_size_t size), PNG_ALLOCATED); /* Added at libpng version 1.2.4 */ -PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_structp png_ptr, +PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_structp png_ptr, png_alloc_size_t size), PNG_ALLOCATED); /* Frees a pointer allocated by png_malloc() */ @@ -1575,7 +1917,7 @@ PNG_EXPORT(99, void, png_data_freer, #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ #ifdef PNG_USER_MEM_SUPPORTED -PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_structp png_ptr, +PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_structp png_ptr, png_alloc_size_t size), PNG_ALLOCATED); PNG_EXPORT(101, void, png_free_default, (png_structp png_ptr, png_voidp ptr)); #endif @@ -1583,11 +1925,11 @@ PNG_EXPORT(101, void, png_free_default, (png_structp png_ptr, png_voidp ptr)); #ifdef PNG_ERROR_TEXT_SUPPORTED /* Fatal error in PNG image of libpng - can't continue */ PNG_EXPORTA(102, void, png_error, - (png_structp png_ptr, png_const_charp error_message), + (png_structp png_ptr, png_const_charp error_message), PNG_NORETURN); /* The same, but the chunk name is prepended to the error string. */ -PNG_EXPORTA(103, void, png_chunk_error, (png_structp png_ptr, +PNG_EXPORTA(103, void, png_chunk_error, (png_structp png_ptr, png_const_charp error_message), PNG_NORETURN); #else @@ -1595,24 +1937,26 @@ PNG_EXPORTA(103, void, png_chunk_error, (png_structp png_ptr, PNG_EXPORTA(104, void, png_err, (png_structp png_ptr), PNG_NORETURN); #endif +#ifdef PNG_WARNINGS_SUPPORTED /* Non-fatal error in libpng. Can continue, but may have a problem. */ -PNG_EXPORT(105, void, png_warning, (png_structp png_ptr, +PNG_EXPORT(105, void, png_warning, (png_structp png_ptr, png_const_charp warning_message)); /* Non-fatal error in libpng, chunk name is prepended to message. */ -PNG_EXPORT(106, void, png_chunk_warning, (png_structp png_ptr, +PNG_EXPORT(106, void, png_chunk_warning, (png_structp png_ptr, png_const_charp warning_message)); +#endif #ifdef PNG_BENIGN_ERRORS_SUPPORTED /* Benign error in libpng. Can continue, but may have a problem. * User can choose whether to handle as a fatal error or as a warning. */ # undef png_benign_error -PNG_EXPORT(107, void, png_benign_error, (png_structp png_ptr, +PNG_EXPORT(107, void, png_benign_error, (png_structp png_ptr, png_const_charp warning_message)); /* Same, chunk name is prepended to message. */ # undef png_chunk_benign_error -PNG_EXPORT(108, void, png_chunk_benign_error, (png_structp png_ptr, +PNG_EXPORT(108, void, png_chunk_benign_error, (png_structp png_ptr, png_const_charp warning_message)); PNG_EXPORT(109, void, png_set_benign_errors, @@ -1641,11 +1985,11 @@ PNG_EXPORT(109, void, png_set_benign_errors, */ /* Returns "flag" if chunk data is valid in info_ptr. */ PNG_EXPORT(110, png_uint_32, png_get_valid, - (png_const_structp png_ptr, png_const_infop info_ptr, + (png_const_structp png_ptr, png_const_infop info_ptr, png_uint_32 flag)); /* Returns number of bytes needed to hold a transformed row. */ -PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structp png_ptr, +PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structp png_ptr, png_const_infop info_ptr)); #ifdef PNG_INFO_IMAGE_SUPPORTED @@ -1667,11 +2011,11 @@ PNG_EXPORT(114, png_byte, png_get_channels, #ifdef PNG_EASY_ACCESS_SUPPORTED /* Returns image width in pixels. */ -PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structp png_ptr, +PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structp png_ptr, png_const_infop info_ptr)); /* Returns image height in pixels. */ -PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structp png_ptr, +PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structp png_ptr, png_const_infop info_ptr)); /* Returns image bit_depth. */ @@ -1679,19 +2023,19 @@ PNG_EXPORT(117, png_byte, png_get_bit_depth, (png_const_structp png_ptr, png_const_infop info_ptr)); /* Returns image color_type. */ -PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structp png_ptr, +PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structp png_ptr, png_const_infop info_ptr)); /* Returns image filter_type. */ -PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structp png_ptr, +PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structp png_ptr, png_const_infop info_ptr)); /* Returns image interlace_type. */ -PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structp png_ptr, +PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structp png_ptr, png_const_infop info_ptr)); /* Returns image compression_type. */ -PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structp png_ptr, +PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structp png_ptr, png_const_infop info_ptr)); /* Returns image resolution in pixels per meter, from pHYs chunk data. */ @@ -1705,7 +2049,7 @@ PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter, /* Returns pixel aspect ratio, computed from pHYs chunk data. */ PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio, (png_const_structp png_ptr, png_const_infop info_ptr)); -PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed, +PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed, (png_const_structp png_ptr, png_const_infop info_ptr)); /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ @@ -1726,47 +2070,68 @@ PNG_EXPORT(130, png_const_bytep, png_get_signature, #ifdef PNG_bKGD_SUPPORTED PNG_EXPORT(131, png_uint_32, png_get_bKGD, - (png_const_structp png_ptr, png_infop info_ptr, + (png_const_structp png_ptr, png_infop info_ptr, png_color_16p *background)); #endif #ifdef PNG_bKGD_SUPPORTED -PNG_EXPORT(132, void, png_set_bKGD, (png_structp png_ptr, png_infop info_ptr, +PNG_EXPORT(132, void, png_set_bKGD, (png_structp png_ptr, png_infop info_ptr, png_const_color_16p background)); #endif #ifdef PNG_cHRM_SUPPORTED -PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structp png_ptr, - png_const_infop info_ptr, double *white_x, double *white_y, double *red_x, - double *red_y, double *green_x, double *green_y, double *blue_x, +PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structp png_ptr, + png_const_infop info_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)); +PNG_FP_EXPORT(230, png_uint_32, png_get_cHRM_XYZ, (png_structp png_ptr, + png_const_infop info_ptr, double *red_X, double *red_Y, double *red_Z, + double *green_X, double *green_Y, double *green_Z, double *blue_X, + double *blue_Y, double *blue_Z)); #ifdef PNG_FIXED_POINT_SUPPORTED /* Otherwise not implemented */ PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed, - (png_const_structp png_ptr, - png_const_infop info_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_const_structp png_ptr, + png_const_infop info_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 +PNG_FIXED_EXPORT(231, png_uint_32, png_get_cHRM_XYZ_fixed, + (png_structp png_ptr, png_const_infop info_ptr, + png_fixed_point *int_red_X, png_fixed_point *int_red_Y, + png_fixed_point *int_red_Z, png_fixed_point *int_green_X, + png_fixed_point *int_green_Y, png_fixed_point *int_green_Z, + png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y, + png_fixed_point *int_blue_Z)); #endif #ifdef PNG_cHRM_SUPPORTED PNG_FP_EXPORT(135, void, png_set_cHRM, - (png_structp png_ptr, png_infop info_ptr, - double white_x, double white_y, double red_x, double red_y, double green_x, + (png_structp png_ptr, png_infop info_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)); -PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_structp png_ptr, - png_infop info_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_FP_EXPORT(232, void, png_set_cHRM_XYZ, (png_structp png_ptr, + png_infop info_ptr, double red_X, double red_Y, double red_Z, + double green_X, double green_Y, double green_Z, double blue_X, + double blue_Y, double blue_Z)); +PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_structp png_ptr, + png_infop info_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)); +PNG_FIXED_EXPORT(233, void, png_set_cHRM_XYZ_fixed, (png_structp png_ptr, + png_infop info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y, + png_fixed_point int_red_Z, png_fixed_point int_green_X, + png_fixed_point int_green_Y, png_fixed_point int_green_Z, + png_fixed_point int_blue_X, png_fixed_point int_blue_Y, + png_fixed_point int_blue_Z)); #endif #ifdef PNG_gAMA_SUPPORTED PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA, - (png_const_structp png_ptr, png_const_infop info_ptr, + (png_const_structp png_ptr, png_const_infop info_ptr, double *file_gamma)); PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed, (png_const_structp png_ptr, png_const_infop info_ptr, @@ -1776,13 +2141,13 @@ PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed, #ifdef PNG_gAMA_SUPPORTED PNG_FP_EXPORT(139, void, png_set_gAMA, (png_structp png_ptr, png_infop info_ptr, double file_gamma)); -PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_structp png_ptr, +PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_structp png_ptr, png_infop info_ptr, png_fixed_point int_file_gamma)); #endif #ifdef PNG_hIST_SUPPORTED PNG_EXPORT(141, png_uint_32, png_get_hIST, - (png_const_structp png_ptr, png_const_infop info_ptr, + (png_const_structp png_ptr, png_const_infop info_ptr, png_uint_16p *hist)); #endif @@ -1792,65 +2157,65 @@ PNG_EXPORT(142, void, png_set_hIST, (png_structp png_ptr, #endif PNG_EXPORT(143, png_uint_32, png_get_IHDR, - (png_structp png_ptr, png_infop info_ptr, - png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type, + (png_structp png_ptr, png_infop info_ptr, + png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type, int *interlace_method, int *compression_method, int *filter_method)); PNG_EXPORT(144, void, png_set_IHDR, - (png_structp png_ptr, png_infop info_ptr, - png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, + (png_structp png_ptr, png_infop info_ptr, + png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, int interlace_method, int compression_method, int filter_method)); #ifdef PNG_oFFs_SUPPORTED PNG_EXPORT(145, png_uint_32, png_get_oFFs, - (png_const_structp png_ptr, png_const_infop info_ptr, + (png_const_structp png_ptr, png_const_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)); #endif #ifdef PNG_oFFs_SUPPORTED PNG_EXPORT(146, void, png_set_oFFs, - (png_structp png_ptr, png_infop info_ptr, + (png_structp png_ptr, png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, int unit_type)); #endif #ifdef PNG_pCAL_SUPPORTED PNG_EXPORT(147, png_uint_32, png_get_pCAL, - (png_const_structp png_ptr, png_const_infop info_ptr, + (png_const_structp png_ptr, png_const_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, - int *nparams, + int *nparams, png_charp *units, png_charpp *params)); #endif #ifdef PNG_pCAL_SUPPORTED PNG_EXPORT(148, void, png_set_pCAL, (png_structp png_ptr, - png_infop info_ptr, - png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, + png_infop info_ptr, + png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, png_const_charp units, png_charpp params)); #endif #ifdef PNG_pHYs_SUPPORTED PNG_EXPORT(149, png_uint_32, png_get_pHYs, - (png_const_structp png_ptr, png_const_infop info_ptr, + (png_const_structp png_ptr, png_const_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); #endif #ifdef PNG_pHYs_SUPPORTED PNG_EXPORT(150, void, png_set_pHYs, - (png_structp png_ptr, png_infop info_ptr, + (png_structp png_ptr, png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); #endif PNG_EXPORT(151, png_uint_32, png_get_PLTE, - (png_const_structp png_ptr, png_const_infop info_ptr, + (png_const_structp png_ptr, png_const_infop info_ptr, png_colorp *palette, int *num_palette)); PNG_EXPORT(152, void, png_set_PLTE, - (png_structp png_ptr, png_infop info_ptr, + (png_structp png_ptr, png_infop info_ptr, png_const_colorp palette, int num_palette)); #ifdef PNG_sBIT_SUPPORTED PNG_EXPORT(153, png_uint_32, png_get_sBIT, - (png_const_structp png_ptr, png_infop info_ptr, + (png_const_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)); #endif @@ -1867,44 +2232,44 @@ PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structp png_ptr, #ifdef PNG_sRGB_SUPPORTED PNG_EXPORT(156, void, png_set_sRGB, (png_structp png_ptr, png_infop info_ptr, int srgb_intent)); -PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_structp png_ptr, +PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_structp png_ptr, png_infop info_ptr, int srgb_intent)); #endif #ifdef PNG_iCCP_SUPPORTED PNG_EXPORT(158, png_uint_32, png_get_iCCP, - (png_const_structp png_ptr, png_const_infop info_ptr, - png_charpp name, int *compression_type, png_bytepp profile, + (png_const_structp png_ptr, png_const_infop info_ptr, + png_charpp name, int *compression_type, png_bytepp profile, png_uint_32 *proflen)); #endif #ifdef PNG_iCCP_SUPPORTED PNG_EXPORT(159, void, png_set_iCCP, - (png_structp png_ptr, png_infop info_ptr, - png_const_charp name, int compression_type, png_const_bytep profile, + (png_structp png_ptr, png_infop info_ptr, + png_const_charp name, int compression_type, png_const_bytep profile, png_uint_32 proflen)); #endif #ifdef PNG_sPLT_SUPPORTED PNG_EXPORT(160, png_uint_32, png_get_sPLT, - (png_const_structp png_ptr, png_const_infop info_ptr, + (png_const_structp png_ptr, png_const_infop info_ptr, png_sPLT_tpp entries)); #endif #ifdef PNG_sPLT_SUPPORTED PNG_EXPORT(161, void, png_set_sPLT, - (png_structp png_ptr, png_infop info_ptr, + (png_structp png_ptr, png_infop info_ptr, png_const_sPLT_tp entries, int nentries)); #endif #ifdef PNG_TEXT_SUPPORTED /* png_get_text also returns the number of text chunks in *num_text */ PNG_EXPORT(162, png_uint_32, png_get_text, - (png_const_structp png_ptr, png_const_infop info_ptr, + (png_const_structp png_ptr, png_const_infop info_ptr, png_textp *text_ptr, int *num_text)); #endif -/* Note while png_set_text() will accept a structure whose text, +/* Note while png_set_text() will accept a structure whose text, * language, and translated keywords are NULL pointers, the structure * returned by png_get_text will always contain regular * zero-terminated C strings. They might be empty strings but @@ -1913,7 +2278,7 @@ PNG_EXPORT(162, png_uint_32, png_get_text, #ifdef PNG_TEXT_SUPPORTED PNG_EXPORT(163, void, png_set_text, - (png_structp png_ptr, png_infop info_ptr, + (png_structp png_ptr, png_infop info_ptr, png_const_textp text_ptr, int num_text)); #endif @@ -1929,30 +2294,30 @@ PNG_EXPORT(165, void, png_set_tIME, #ifdef PNG_tRNS_SUPPORTED PNG_EXPORT(166, png_uint_32, png_get_tRNS, - (png_const_structp png_ptr, png_infop info_ptr, + (png_const_structp png_ptr, png_infop info_ptr, png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)); #endif #ifdef PNG_tRNS_SUPPORTED PNG_EXPORT(167, void, png_set_tRNS, - (png_structp png_ptr, png_infop info_ptr, - png_const_bytep trans_alpha, int num_trans, + (png_structp png_ptr, png_infop info_ptr, + png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)); #endif #ifdef PNG_sCAL_SUPPORTED PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL, - (png_const_structp png_ptr, png_const_infop info_ptr, + (png_const_structp png_ptr, png_const_infop info_ptr, int *unit, double *width, double *height)); #ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED -/* NOTE: this API is currently implemented using floating point arithmetic, +/* NOTE: this API is currently implemented using floating point arithmetic, * consequently it can only be used on systems with floating point support. * In any case the range of values supported by png_fixed_point is small and it * is highly recommended that png_get_sCAL_s be used instead. */ PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed, (png_structp png_ptr, png_const_infop info_ptr, int *unit, - png_fixed_point *width, + png_fixed_point *width, png_fixed_point *height)); #endif PNG_EXPORT(169, png_uint_32, png_get_sCAL_s, @@ -1960,13 +2325,13 @@ PNG_EXPORT(169, png_uint_32, png_get_sCAL_s, int *unit, png_charpp swidth, png_charpp sheight)); PNG_FP_EXPORT(170, void, png_set_sCAL, - (png_structp png_ptr, png_infop info_ptr, + (png_structp png_ptr, png_infop info_ptr, int unit, double width, double height)); -PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_structp png_ptr, - png_infop info_ptr, int unit, png_fixed_point width, +PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_structp png_ptr, + png_infop info_ptr, int unit, png_fixed_point width, png_fixed_point height)); PNG_EXPORT(171, void, png_set_sCAL_s, - (png_structp png_ptr, png_infop info_ptr, + (png_structp png_ptr, png_infop info_ptr, int unit, png_const_charp swidth, png_const_charp sheight)); #endif /* PNG_sCAL_SUPPORTED */ @@ -1974,30 +2339,36 @@ PNG_EXPORT(171, void, png_set_sCAL_s, /* Provide a list of chunks and how they are to be handled, if the built-in handling or default unknown chunk handling is not desired. Any chunks not listed will be handled in the default manner. The IHDR and IEND chunks - must not be listed. - keep = 0: follow default behaviour - = 1: do not keep - = 2: keep only if safe-to-copy - = 3: keep even if unsafe-to-copy + must not be listed. Because this turns off the default handling for chunks + that would otherwise be recognized the behavior of libpng transformations may + well become incorrect! + keep = 0: PNG_HANDLE_CHUNK_AS_DEFAULT: follow default behavior + = 1: PNG_HANDLE_CHUNK_NEVER: do not keep + = 2: PNG_HANDLE_CHUNK_IF_SAFE: keep only if safe-to-copy + = 3: PNG_HANDLE_CHUNK_ALWAYS: keep even if unsafe-to-copy */ PNG_EXPORT(172, void, png_set_keep_unknown_chunks, - (png_structp png_ptr, int keep, + (png_structp png_ptr, int keep, png_const_bytep chunk_list, int num_chunks)); -PNG_EXPORT(173, int, png_handle_as_unknown, (png_structp png_ptr, + +/* The handling code is returned; the result is therefore true (non-zero) if + * special handling is required, false for the default handling. + */ +PNG_EXPORT(173, int, png_handle_as_unknown, (png_structp png_ptr, png_const_bytep chunk_name)); #endif #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED -PNG_EXPORT(174, void, png_set_unknown_chunks, (png_structp png_ptr, +PNG_EXPORT(174, void, png_set_unknown_chunks, (png_structp png_ptr, png_infop info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)); PNG_EXPORT(175, void, png_set_unknown_chunk_location, (png_structp png_ptr, png_infop info_ptr, int chunk, int location)); -PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structp png_ptr, +PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structp png_ptr, png_const_infop info_ptr, png_unknown_chunkpp entries)); #endif /* Png_free_data() will turn off the "valid" flag for anything it frees. - * If you need to turn it off for a chunk that your application has freed, + * If you need to turn it off for a chunk that your application has freed, * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */ PNG_EXPORT(177, void, png_set_invalid, @@ -2005,9 +2376,9 @@ PNG_EXPORT(177, void, png_set_invalid, #ifdef PNG_INFO_IMAGE_SUPPORTED /* The "params" pointer is currently not used and is for future expansion. */ -PNG_EXPORT(178, void, png_read_png, (png_structp png_ptr, png_infop info_ptr, +PNG_EXPORT(178, void, png_read_png, (png_structp png_ptr, png_infop info_ptr, int transforms, png_voidp params)); -PNG_EXPORT(179, void, png_write_png, (png_structp png_ptr, png_infop info_ptr, +PNG_EXPORT(179, void, png_write_png, (png_structp png_ptr, png_infop info_ptr, int transforms, png_voidp params)); #endif @@ -2021,7 +2392,7 @@ PNG_EXPORT(183, png_const_charp, png_get_libpng_ver, (png_const_structp png_ptr)); #ifdef PNG_MNG_FEATURES_SUPPORTED -PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structp png_ptr, +PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structp png_ptr, png_uint_32 mng_features_permitted)); #endif @@ -2036,25 +2407,25 @@ PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structp png_ptr, */ #ifdef PNG_ERROR_NUMBERS_SUPPORTED PNG_EXPORT(185, void, png_set_strip_error_numbers, - (png_structp png_ptr, + (png_structp png_ptr, png_uint_32 strip_mode)); #endif /* Added in libpng-1.2.6 */ #ifdef PNG_SET_USER_LIMITS_SUPPORTED -PNG_EXPORT(186, void, png_set_user_limits, (png_structp png_ptr, +PNG_EXPORT(186, void, png_set_user_limits, (png_structp png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); PNG_EXPORT(187, png_uint_32, png_get_user_width_max, (png_const_structp png_ptr)); PNG_EXPORT(188, png_uint_32, png_get_user_height_max, (png_const_structp png_ptr)); /* Added in libpng-1.4.0 */ -PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structp png_ptr, +PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structp png_ptr, png_uint_32 user_chunk_cache_max)); PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max, (png_const_structp png_ptr)); /* Added in libpng-1.4.1 */ -PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structp png_ptr, +PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structp png_ptr, png_alloc_size_t user_chunk_cache_max)); PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max, (png_const_structp png_ptr)); @@ -2073,19 +2444,19 @@ PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch, PNG_FP_EXPORT(196, float, png_get_x_offset_inches, (png_const_structp png_ptr, png_const_infop info_ptr)); #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ -PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed, +PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed, (png_structp png_ptr, png_const_infop info_ptr)); #endif -PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structp png_ptr, +PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structp png_ptr, png_const_infop info_ptr)); #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ -PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed, +PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed, (png_structp png_ptr, png_const_infop info_ptr)); #endif # ifdef PNG_pHYs_SUPPORTED -PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structp png_ptr, +PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structp png_ptr, png_const_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); # endif /* PNG_pHYs_SUPPORTED */ @@ -2122,8 +2493,16 @@ PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type, * full, image which appears in a given pass. 'pass' is in the range 0 * to 6 and the result is in the range 0 to 7. */ -#define PNG_PASS_START_ROW(pass) (((1U&~(pass))<<(3-((pass)>>1)))&7) -#define PNG_PASS_START_COL(pass) (((1U& (pass))<<(3-(((pass)+1)>>1)))&7) +#define PNG_PASS_START_ROW(pass) (((1&~(pass))<<(3-((pass)>>1)))&7) +#define PNG_PASS_START_COL(pass) (((1& (pass))<<(3-(((pass)+1)>>1)))&7) + +/* A macro to return the offset between pixels in the output row for a pair of + * pixels in the input - effectively the inverse of the 'COL_SHIFT' macro that + * follows. Note that ROW_OFFSET is the offset from one row to the next whereas + * COL_OFFSET is from one column to the next, within a row. + */ +#define PNG_PASS_ROW_OFFSET(pass) ((pass)>2?(8>>(((pass)-1)>>1)):8) +#define PNG_PASS_COL_OFFSET(pass) (1<<((7-(pass))>>1)) /* Two macros to help evaluate the number of rows or columns in each * pass. This is expressed as a shift - effectively log2 of the number or @@ -2142,8 +2521,9 @@ PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type, #define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\ -1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass)) -/* For the progressive reader it is necessary to find the row in the output - * image given a row in an interlaced image, so two more macros: +/* For the reader row callbacks (both progressive and sequential) it is + * necessary to find the row in the output image given a row in an interlaced + * image, so two more macros: */ #define PNG_ROW_FROM_PASS_ROW(yIn, pass) \ (((yIn)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass)) @@ -2157,8 +2537,8 @@ PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type, * the tile. */ #define PNG_PASS_MASK(pass,off) ( \ - ((0x110145AFU>>(((7-(off))-(pass))<<2)) & 0xFU) | \ - ((0x01145AF0U>>(((7-(off))-(pass))<<2)) & 0xF0U)) + ((0x110145AF>>(((7-(off))-(pass))<<2)) & 0xF) | \ + ((0x01145AF0>>(((7-(off))-(pass))<<2)) & 0xF0)) #define PNG_ROW_IN_INTERLACE_PASS(y, pass) \ ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1) @@ -2184,14 +2564,14 @@ PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type, { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \ * (png_uint_16)(alpha) \ + (png_uint_16)(bg)*(png_uint_16)(255 \ - - (png_uint_16)(alpha)) + (png_uint_16)128); \ + - (png_uint_16)(alpha)) + 128); \ (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } # define png_composite_16(composite, fg, alpha, bg) \ { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) \ * (png_uint_32)(alpha) \ - + (png_uint_32)(bg)*(png_uint_32)(65535L \ - - (png_uint_32)(alpha)) + (png_uint_32)32768L); \ + + (png_uint_32)(bg)*(65535 \ + - (png_uint_32)(alpha)) + 32768); \ (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } #else /* Standard method using integer division */ @@ -2199,12 +2579,12 @@ PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type, # define png_composite(composite, fg, alpha, bg) \ (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ - (png_uint_16)127) / 255) + 127) / 255) # define png_composite_16(composite, fg, alpha, bg) \ (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ - (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ - (png_uint_32)32767) / (png_uint_32)65535L) + (png_uint_32)(bg)*(png_uint_32)(65535 - (png_uint_32)(alpha)) + \ + 32767) / 65535) #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ #ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED @@ -2213,7 +2593,7 @@ PNG_EXPORT(202, png_uint_16, png_get_uint_16, (png_const_bytep buf)); PNG_EXPORT(203, png_int_32, png_get_int_32, (png_const_bytep buf)); #endif -PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_structp png_ptr, +PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_structp png_ptr, png_const_bytep buf)); /* No png_get_int_16 -- may be added if there's a real need for it. */ @@ -2226,7 +2606,7 @@ PNG_EXPORT(206, void, png_save_int_32, (png_bytep buf, png_int_32 i)); #endif /* Place a 16-bit number into a buffer in PNG byte order. - * The parameter is declared unsigned int, not png_uint_16, + * The parameter is declared unsigned int, not png_uint_16, * just to avoid potential problems on pre-ANSI C compilers. */ #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED @@ -2259,6 +2639,12 @@ PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i)); : (png_int_32)png_get_uint_32(buf))) #endif +#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ + defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) +PNG_EXPORT(234, void, png_set_check_for_invalid_index, (png_structp png_ptr, + int allowed)); +#endif + /* Maintainer: Put new public prototypes here ^, in libpng.3, and project * defs */ @@ -2268,7 +2654,7 @@ PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i)); * scripts/symbols.def as well. */ #ifdef PNG_EXPORT_LAST_ORDINAL - PNG_EXPORT_LAST_ORDINAL(220); + PNG_EXPORT_LAST_ORDINAL(234); #endif #ifdef __cplusplus |