0,0 → 1,3283 |
/* png.h - header file for PNG reference library |
* |
* libpng version 1.2.5 - October 3, 2002 |
* Copyright (c) 1998-2002 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.) |
* |
* 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 1.2.5 - October 3, 2002: Glenn |
* See also "Contributing Authors", below. |
* |
* Note about libpng version numbers: |
* |
* Due to various miscommunications, unforeseen code incompatibilities |
* and occasional factors outside the authors' control, version numbering |
* on the library has not always been consistent and straightforward. |
* The following table summarizes matters since version 0.89c, which was |
* the first widely used release: |
* |
* source png.h png.h shared-lib |
* version string int version |
* ------- ------ ----- ---------- |
* 0.89c "1.0 beta 3" 0.89 89 1.0.89 |
* 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] |
* 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] |
* 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] |
* 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] |
* 0.97c 0.97 97 2.0.97 |
* 0.98 0.98 98 2.0.98 |
* 0.99 0.99 98 2.0.99 |
* 0.99a-m 0.99 99 2.0.99 |
* 1.00 1.00 100 2.1.0 [100 should be 10000] |
* 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] |
* 1.0.1 png.h string is 10001 2.1.0 |
* 1.0.1a-e identical to the 10002 from here on, the shared library |
* 1.0.2 source version) 10002 is 2.V where V is the source code |
* 1.0.2a-b 10003 version, except as noted. |
* 1.0.3 10003 |
* 1.0.3a-d 10004 |
* 1.0.4 10004 |
* 1.0.4a-f 10005 |
* 1.0.5 (+ 2 patches) 10005 |
* 1.0.5a-d 10006 |
* 1.0.5e-r 10100 (not source compatible) |
* 1.0.5s-v 10006 (not binary compatible) |
* 1.0.6 (+ 3 patches) 10006 (still binary incompatible) |
* 1.0.6d-f 10007 (still binary incompatible) |
* 1.0.6g 10007 |
* 1.0.6h 10007 10.6h (testing xy.z so-numbering) |
* 1.0.6i 10007 10.6i |
* 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) |
* 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) |
* 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) |
* 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) |
* 1.0.7 1 10007 (still compatible) |
* 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 |
* 1.0.8rc1 1 10008 2.1.0.8rc1 |
* 1.0.8 1 10008 2.1.0.8 |
* 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 |
* 1.0.9rc1 1 10009 2.1.0.9rc1 |
* 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 |
* 1.0.9rc2 1 10009 2.1.0.9rc2 |
* 1.0.9 1 10009 2.1.0.9 |
* 1.0.10beta1 1 10010 2.1.0.10beta1 |
* 1.0.10rc1 1 10010 2.1.0.10rc1 |
* 1.0.10 1 10010 2.1.0.10 |
* 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 |
* 1.0.11rc1 1 10011 2.1.0.11rc1 |
* 1.0.11 1 10011 2.1.0.11 |
* 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 |
* 1.0.12rc1 2 10012 2.1.0.12rc1 |
* 1.0.12 2 10012 2.1.0.12 |
* 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) |
* 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 |
* 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 |
* 1.2.0rc1 3 10200 3.1.2.0rc1 |
* 1.2.0 3 10200 3.1.2.0 |
* 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 |
* 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 |
* 1.2.1 3 10201 3.1.2.1 |
* 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 |
* 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 |
* 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 |
* 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 |
* 1.0.13 10 10013 10.so.0.1.0.13 |
* 1.2.2 12 10202 12.so.0.1.2.2 |
* 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 |
* 1.2.3 12 10203 12.so.0.1.2.3 |
* 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 |
* 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 |
* 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 |
* 1.0.14 10 10014 10.so.0.1.0.14 |
* 1.2.4 13 10204 12.so.0.1.2.4 |
* 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 |
* 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 |
* 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 |
* 1.0.15 10 10015 10.so.0.1.0.15 |
* 1.2.5 13 10205 12.so.0.1.2.5 |
* |
* Henceforth the source version will match the shared-library major |
* and minor numbers; the shared-library major version number will be |
* used for changes in backward compatibility, as it is intended. The |
* PNG_LIBPNG_VER macro, which is not used within libpng but is available |
* for applications, is an unsigned integer of the form xyyzz corresponding |
* 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". |
* |
* Binary incompatibility exists only when applications make direct access |
* to the info_ptr or png_ptr members through png.h, and the compiled |
* application is loaded with a different version of the library. |
* |
* DLLNUM will change each time there are forward or backward changes |
* in binary compatibility (e.g., when a new feature is added). |
* |
* See libpng.txt or libpng.3 for more information. The PNG specification |
* is available as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/> |
* and as a W3C Recommendation <http://www.w3.org/TR/REC.png.html> |
*/ |
|
/* |
* COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: |
* |
* If you modify libpng you may insert additional notices immediately following |
* this sentence. |
* |
* libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are |
* Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are |
* distributed according to the same disclaimer and license as libpng-1.0.6 |
* with the following individuals added to the list of Contributing Authors |
* |
* Simon-Pierre Cadieux |
* Eric S. Raymond |
* Gilles Vollant |
* |
* and with the following additions to the disclaimer: |
* |
* There is no warranty against interference with your enjoyment of the |
* library or against infringement. There is no warranty that our |
* efforts or the library will fulfill any of your particular purposes |
* or needs. This library is provided with all faults, and the entire |
* risk of satisfactory quality, performance, accuracy, and effort is with |
* the user. |
* |
* libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are |
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson |
* 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 |
* Glenn Randers-Pehrson |
* Willem van Schaik |
* |
* 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, |
* with the following individuals added to the list of Contributing Authors: |
* |
* John Bowler |
* Kevin Bracey |
* Sam Bushell |
* Magnus Holmgren |
* Greg Roelofs |
* Tom Tanner |
* |
* libpng versions 0.5, May 1995, through 0.88, January 1996, are |
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
* |
* For the purposes of this copyright and license, "Contributing Authors" |
* is defined as the following set of individuals: |
* |
* Andreas Dilger |
* Dave Martindale |
* Guy Eric Schalnat |
* Paul Schmidt |
* Tim Wegner |
* |
* The PNG Reference Library is supplied "AS IS". The Contributing Authors |
* 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, |
* or consequential damages, which may result from the use of the PNG |
* Reference Library, even if advised of the possibility of such damage. |
* |
* Permission is hereby granted to use, copy, modify, and distribute this |
* source code, or portions hereof, for any purpose, without fee, subject |
* to the following restrictions: |
* |
* 1. The origin of this source code must not be misrepresented. |
* |
* 2. Altered versions must be plainly marked as such and |
* must not be misrepresented as being the original source. |
* |
* 3. This Copyright notice may not be removed or altered from |
* any source or altered source distribution. |
* |
* The Contributing Authors and Group 42, Inc. specifically permit, without |
* fee, and encourage the use of this source code as a component to |
* supporting the PNG file format in commercial products. If you use this |
* source code in a product, acknowledgment is not required but would be |
* appreciated. |
*/ |
|
/* |
* A "png_get_copyright" function is available, for convenient use in "about" |
* boxes and the like: |
* |
* printf("%s",png_get_copyright(NULL)); |
* |
* Also, the PNG logo (in PNG format, of course) is supplied in the |
* files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). |
*/ |
|
/* |
* Libpng is OSI Certified Open Source Software. OSI Certified is a |
* certification mark of the Open Source Initiative. |
*/ |
|
/* |
* The contributing authors would like to thank all those who helped |
* with testing, bug fixes, and patience. This wouldn't have been |
* possible without all of you. |
* |
* Thanks to Frank J. T. Wojcik for helping with the documentation. |
*/ |
|
/* |
* Y2K compliance in libpng: |
* ========================= |
* |
* October 3, 2002 |
* |
* 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 1.2.5 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 |
* 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. |
* |
* There are seven time-related functions: |
* png.c: png_convert_to_rfc_1123() in png.c |
* (formerly png_convert_to_rfc_1152() in error) |
* png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c |
* png_convert_from_time_t() in pngwrite.c |
* png_get_tIME() in pngget.c |
* png_handle_tIME() in pngrutil.c, called in pngread.c |
* png_set_tIME() in pngset.c |
* png_write_tIME() in pngwutil.c, called in pngwrite.c |
* |
* All handle dates properly in a Y2K environment. The |
* png_convert_from_time_t() function calls gmtime() to convert from system |
* clock time, which returns (year - 1900), which we properly convert to |
* 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, |
* 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. |
* |
* The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned |
* integer to hold the year, and can hold years as large as 65535. |
* |
* zlib, upon which libpng depends, is also Y2K compliant. It contains |
* no date-related code. |
* |
* Glenn Randers-Pehrson |
* libpng maintainer |
* PNG Development Group |
*/ |
|
#ifndef PNG_H |
#define PNG_H |
|
/* This is not the place to learn how to use libpng. The file libpng.txt |
* 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. |
*/ |
|
/* Version information for png.h - this should match the version in png.c */ |
#define PNG_LIBPNG_VER_STRING "1.2.5" |
|
#define PNG_LIBPNG_VER_SONUM 0 |
#define PNG_LIBPNG_VER_DLLNUM %DLLNUM% |
|
/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ |
#define PNG_LIBPNG_VER_MAJOR 1 |
#define PNG_LIBPNG_VER_MINOR 2 |
#define PNG_LIBPNG_VER_RELEASE 5 |
/* This should match the numeric part of the final component of |
* PNG_LIBPNG_VER_STRING, omitting any leading zero: */ |
|
#define PNG_LIBPNG_VER_BUILD 0 |
|
#define PNG_LIBPNG_BUILD_ALPHA 1 |
#define PNG_LIBPNG_BUILD_BETA 2 |
#define PNG_LIBPNG_BUILD_RC 3 |
#define PNG_LIBPNG_BUILD_STABLE 4 |
#define PNG_LIBPNG_BUILD_TYPEMASK 7 |
#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with STABLE only */ |
#define PNG_LIBPNG_BUILD_TYPE 4 |
|
/* Careful here. At one time, Guy wanted to use 082, but that would be octal. |
* We must not include leading zeros. |
* Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only |
* 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 10205 /* 1.2.5 */ |
|
#ifndef PNG_VERSION_INFO_ONLY |
|
/* include the compression library's header */ |
#include "zlib.h" |
|
/* include all user configurable info, including optional assembler routines */ |
#include "pngconf.h" |
|
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */ |
#ifdef __cplusplus |
extern "C" { |
#endif /* __cplusplus */ |
|
/* This file is arranged in several sections. The first section contains |
* structure and type definitions. The second section contains the external |
* library functions, while the third has the internal library functions, |
* which applications aren't expected to use directly. |
*/ |
|
#ifndef PNG_NO_TYPECAST_NULL |
#define int_p_NULL (int *)NULL |
#define png_bytep_NULL (png_bytep)NULL |
#define png_bytepp_NULL (png_bytepp)NULL |
#define png_doublep_NULL (png_doublep)NULL |
#define png_error_ptr_NULL (png_error_ptr)NULL |
#define png_flush_ptr_NULL (png_flush_ptr)NULL |
#define png_free_ptr_NULL (png_free_ptr)NULL |
#define png_infopp_NULL (png_infopp)NULL |
#define png_malloc_ptr_NULL (png_malloc_ptr)NULL |
#define png_read_status_ptr_NULL (png_read_status_ptr)NULL |
#define png_rw_ptr_NULL (png_rw_ptr)NULL |
#define png_structp_NULL (png_structp)NULL |
#define png_uint_16p_NULL (png_uint_16p)NULL |
#define png_voidp_NULL (png_voidp)NULL |
#define png_write_status_ptr_NULL (png_write_status_ptr)NULL |
#else |
#define int_p_NULL NULL |
#define png_bytep_NULL NULL |
#define png_bytepp_NULL NULL |
#define png_doublep_NULL NULL |
#define png_error_ptr_NULL NULL |
#define png_flush_ptr_NULL NULL |
#define png_free_ptr_NULL NULL |
#define png_infopp_NULL NULL |
#define png_malloc_ptr_NULL NULL |
#define png_read_status_ptr_NULL NULL |
#define png_rw_ptr_NULL NULL |
#define png_structp_NULL NULL |
#define png_uint_16p_NULL NULL |
#define png_voidp_NULL NULL |
#define png_write_status_ptr_NULL NULL |
#endif |
|
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ |
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) |
/* Version information for C files, stored in png.c. This had better match |
* the version above. |
*/ |
#ifdef PNG_USE_GLOBAL_ARRAYS |
PNG_EXPORT_VAR (const char) png_libpng_ver[18]; |
/* need room for 99.99.99beta99z */ |
#else |
#define png_libpng_ver png_get_header_ver(NULL) |
#endif |
|
#ifdef PNG_USE_GLOBAL_ARRAYS |
/* This was removed in version 1.0.5c */ |
/* Structures to facilitate easy interlacing. See png.c for more details */ |
PNG_EXPORT_VAR (const int FARDATA) png_pass_start[7]; |
PNG_EXPORT_VAR (const int FARDATA) png_pass_inc[7]; |
PNG_EXPORT_VAR (const int FARDATA) png_pass_ystart[7]; |
PNG_EXPORT_VAR (const int FARDATA) png_pass_yinc[7]; |
PNG_EXPORT_VAR (const int FARDATA) png_pass_mask[7]; |
PNG_EXPORT_VAR (const int FARDATA) png_pass_dsp_mask[7]; |
#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW |
PNG_EXPORT_VAR (const int FARDATA) png_pass_width[7]; |
#endif |
/* This isn't currently used. If you need it, see png.c for more details. |
PNG_EXPORT_VAR (const int FARDATA) png_pass_height[7]; |
*/ |
#endif |
|
#endif /* PNG_NO_EXTERN */ |
|
/* 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 |
* be png_byte or png_uint_16 (as defined below). |
*/ |
typedef struct png_color_struct |
{ |
png_byte red; |
png_byte green; |
png_byte blue; |
} png_color; |
typedef png_color FAR * png_colorp; |
typedef png_color FAR * FAR * png_colorpp; |
|
typedef struct png_color_16_struct |
{ |
png_byte index; /* used for palette files */ |
png_uint_16 red; /* for use in red green blue files */ |
png_uint_16 green; |
png_uint_16 blue; |
png_uint_16 gray; /* for use in grayscale files */ |
} png_color_16; |
typedef png_color_16 FAR * png_color_16p; |
typedef png_color_16 FAR * FAR * png_color_16pp; |
|
typedef struct png_color_8_struct |
{ |
png_byte red; /* for use in red green blue files */ |
png_byte green; |
png_byte blue; |
png_byte gray; /* for use in grayscale files */ |
png_byte alpha; /* for alpha channel files */ |
} png_color_8; |
typedef png_color_8 FAR * png_color_8p; |
typedef png_color_8 FAR * FAR * png_color_8pp; |
|
/* |
* The following two structures are used for the in-core representation |
* of sPLT chunks. |
*/ |
typedef struct png_sPLT_entry_struct |
{ |
png_uint_16 red; |
png_uint_16 green; |
png_uint_16 blue; |
png_uint_16 alpha; |
png_uint_16 frequency; |
} png_sPLT_entry; |
typedef png_sPLT_entry FAR * png_sPLT_entryp; |
typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; |
|
/* When the depth of the sPLT palette is 8 bits, the color and alpha samples |
* occupy the LSB of their respective members, and the MSB of each member |
* is zero-filled. The frequency member always occupies the full 16 bits. |
*/ |
|
typedef struct png_sPLT_struct |
{ |
png_charp name; /* palette name */ |
png_byte depth; /* depth of palette samples */ |
png_sPLT_entryp entries; /* palette entries */ |
png_int_32 nentries; /* number of palette entries */ |
} png_sPLT_t; |
typedef png_sPLT_t FAR * png_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, |
* 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. |
*/ |
typedef struct png_text_struct |
{ |
int compression; /* compression value: |
-1: tEXt, none |
0: zTXt, deflate |
1: iTXt, none |
2: iTXt, deflate */ |
png_charp key; /* keyword, 1-79 character description of "text" */ |
png_charp text; /* comment, may be an empty string (ie "") |
or a NULL pointer */ |
png_size_t text_length; /* length of the text string */ |
#ifdef PNG_iTXt_SUPPORTED |
png_size_t itxt_length; /* length of the itxt string */ |
png_charp lang; /* language code, 0-79 characters |
or a NULL pointer */ |
png_charp lang_key; /* keyword translated UTF-8 string, 0 or more |
chars or a NULL pointer */ |
#endif |
} png_text; |
typedef png_text FAR * png_textp; |
typedef png_text FAR * FAR * png_textpp; |
#endif |
|
/* Supported compression types for text in PNG files (tEXt, and zTXt). |
* The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ |
#define PNG_TEXT_COMPRESSION_NONE_WR -3 |
#define PNG_TEXT_COMPRESSION_zTXt_WR -2 |
#define PNG_TEXT_COMPRESSION_NONE -1 |
#define PNG_TEXT_COMPRESSION_zTXt 0 |
#define PNG_ITXT_COMPRESSION_NONE 1 |
#define PNG_ITXT_COMPRESSION_zTXt 2 |
#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ |
|
/* png_time is a way to hold the time in an machine independent way. |
* Two conversions are provided, both from time_t and struct tm. There |
* is no portable way to convert to either of these structures, as far |
* as I know. If you know of a portable way, send it to me. As a side |
* note - PNG has always been Year 2000 compliant! |
*/ |
typedef struct png_time_struct |
{ |
png_uint_16 year; /* full year, as in, 1995 */ |
png_byte month; /* month of year, 1 - 12 */ |
png_byte day; /* day of month, 1 - 31 */ |
png_byte hour; /* hour of day, 0 - 23 */ |
png_byte minute; /* minute of hour, 0 - 59 */ |
png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ |
} png_time; |
typedef png_time FAR * png_timep; |
typedef png_time FAR * FAR * png_timepp; |
|
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
/* png_unknown_chunk is a structure to hold queued chunks for which there is |
* no specific support. The idea is that we can use this to queue |
* up private chunks for output even though the library doesn't actually |
* know about their semantics. |
*/ |
typedef struct png_unknown_chunk_t |
{ |
png_byte name[5]; |
png_byte *data; |
png_size_t size; |
|
/* 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_unknown_chunk FAR * FAR * png_unknown_chunkpp; |
#endif |
|
/* png_info is a structure that holds the information in a PNG file so |
* that the application can find out the characteristics of the image. |
* If you are reading the file, this structure will tell you what is |
* in the PNG file. If you are writing the file, fill in the information |
* you want to put into the PNG file, then call png_write_info(). |
* The names chosen should be very close to the PNG specification, so |
* consult that document for information about the meaning of each field. |
* |
* With libpng < 0.95, it was only possible to directly set and read the |
* the values in the png_info_struct, which meant that the contents and |
* order of the values had to remain fixed. With libpng 0.95 and later, |
* however, there are now functions that abstract the contents of |
* png_info_struct from the application, so this makes it easier to use |
* libpng with dynamic libraries, and even makes it possible to use |
* libraries that don't have all of the libpng ancillary chunk-handing |
* functionality. |
* |
* In any case, the order of the parameters in png_info_struct should NOT |
* be changed for as long as possible to keep compatibility with applications |
* that use the old direct-access method with png_info_struct. |
* |
* The following members may have allocated storage attached that should be |
* cleaned up before the structure is discarded: palette, trans, text, |
* pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, |
* splt_palettes, scal_unit, row_pointers, and unknowns. By default, these |
* are automatically freed when the info structure is deallocated, if they were |
* allocated internally by libpng. This behavior can be changed by means |
* of the png_data_freer() function. |
* |
* More allocation details: all the chunk-reading functions that |
* change these members go through the corresponding png_set_* |
* functions. A function to clear these members is available: see |
* png_free_data(). The png_set_* functions do not depend on being |
* able to point info structure members to any of the storage they are |
* passed (they make their own copies), EXCEPT that the png_set_text |
* functions use the same storage passed to them in the text_ptr or |
* itxt_ptr structure argument, and the png_set_rows and png_set_unknowns |
* functions do not make their own copies. |
*/ |
typedef struct png_info_struct |
{ |
/* the following are necessary for every PNG file */ |
png_uint_32 width; /* width of image in pixels (from IHDR) */ |
png_uint_32 height; /* height of image in pixels (from IHDR) */ |
png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ |
png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */ |
png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */ |
png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */ |
png_uint_16 num_trans; /* number of transparent palette color (tRNS) */ |
png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ |
png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */ |
/* The following three should have been named *_method not *_type */ |
png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ |
png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ |
png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ |
|
/* The following is informational only on read, and not used on writes. */ |
png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */ |
png_byte pixel_depth; /* number of bits per pixel */ |
png_byte spare_byte; /* to align the data, and for future use */ |
png_byte signature[8]; /* magic bytes read by libpng from start of file */ |
|
/* The rest of the data is optional. If you are reading, check the |
* valid field to see if the information in these are valid. If you |
* are writing, set the valid field to those chunks you want written, |
* and initialize the appropriate fields below. |
*/ |
|
#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) |
/* The gAMA chunk describes the gamma characteristics of the system |
* on which the image was created, normally in the range [1.0, 2.5]. |
* Data is valid if (valid & PNG_INFO_gAMA) is non-zero. |
*/ |
float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ |
#endif |
|
#if defined(PNG_sRGB_SUPPORTED) |
/* GR-P, 0.96a */ |
/* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ |
png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */ |
#endif |
|
#if defined(PNG_TEXT_SUPPORTED) |
/* The tEXt, and zTXt chunks contain human-readable textual data in |
* uncompressed, compressed, and optionally compressed forms, respectively. |
* The data in "text" is an array of pointers to uncompressed, |
* null-terminated C strings. Each chunk has a keyword that describes the |
* textual data contained in that chunk. Keywords are not required to be |
* unique, and the text string may be empty. Any number of text chunks may |
* be in an image. |
*/ |
int num_text; /* number of comments read/to write */ |
int max_text; /* current size of text array */ |
png_textp text; /* array of comments read/to write */ |
#endif /* PNG_TEXT_SUPPORTED */ |
|
#if defined(PNG_tIME_SUPPORTED) |
/* The tIME chunk holds the last time the displayed image data was |
* modified. See the png_time struct for the contents of this struct. |
*/ |
png_time mod_time; |
#endif |
|
#if defined(PNG_sBIT_SUPPORTED) |
/* The sBIT chunk specifies the number of significant high-order bits |
* in the pixel data. Values are in the range [1, bit_depth], and are |
* only specified for the channels in the pixel data. The contents of |
* the low-order bits is not specified. Data is valid if |
* (valid & PNG_INFO_sBIT) is non-zero. |
*/ |
png_color_8 sig_bit; /* significant bits in color channels */ |
#endif |
|
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ |
defined(PNG_READ_BACKGROUND_SUPPORTED) |
/* The tRNS chunk supplies transparency data for paletted images and |
* other image types that don't need a full alpha channel. There are |
* "num_trans" transparency values for a paletted image, stored in the |
* same order as the palette colors, starting from index 0. Values |
* for the data are in the range [0, 255], ranging from fully transparent |
* to fully opaque, respectively. For non-paletted images, there is a |
* single color specified that should be treated as fully transparent. |
* Data is valid if (valid & PNG_INFO_tRNS) is non-zero. |
*/ |
png_bytep trans; /* transparent values for paletted image */ |
png_color_16 trans_values; /* transparent color for non-palette image */ |
#endif |
|
#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
/* The bKGD chunk gives the suggested image background color if the |
* display program does not have its own background color and the image |
* is needs to composited onto a background before display. The colors |
* in "background" are normally in the same color space/depth as the |
* pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. |
*/ |
png_color_16 background; |
#endif |
|
#if defined(PNG_oFFs_SUPPORTED) |
/* The oFFs chunk gives the offset in "offset_unit_type" units rightwards |
* and downwards from the top-left corner of the display, page, or other |
* application-specific co-ordinate space. See the PNG_OFFSET_ defines |
* below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. |
*/ |
png_int_32 x_offset; /* x offset on page */ |
png_int_32 y_offset; /* y offset on page */ |
png_byte offset_unit_type; /* offset units type */ |
#endif |
|
#if defined(PNG_pHYs_SUPPORTED) |
/* The pHYs chunk gives the physical pixel density of the image for |
* display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ |
* defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. |
*/ |
png_uint_32 x_pixels_per_unit; /* horizontal pixel density */ |
png_uint_32 y_pixels_per_unit; /* vertical pixel density */ |
png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */ |
#endif |
|
#if defined(PNG_hIST_SUPPORTED) |
/* The hIST chunk contains the relative frequency or importance of the |
* various palette entries, so that a viewer can intelligently select a |
* reduced-color palette, if required. Data is an array of "num_palette" |
* values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) |
* is non-zero. |
*/ |
png_uint_16p hist; |
#endif |
|
#ifdef PNG_cHRM_SUPPORTED |
/* The cHRM chunk describes the CIE color characteristics of the monitor |
* on which the PNG was created. This data allows the viewer to do gamut |
* mapping of the input image to ensure that the viewer sees the same |
* colors in the image as the creator. Values are in the range |
* [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. |
*/ |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
float x_white; |
float y_white; |
float x_red; |
float y_red; |
float x_green; |
float y_green; |
float x_blue; |
float y_blue; |
#endif |
#endif |
|
#if defined(PNG_pCAL_SUPPORTED) |
/* The pCAL chunk describes a transformation between the stored pixel |
* values and original physical data values used to create the image. |
* The integer range [0, 2^bit_depth - 1] maps to the floating-point |
* range given by [pcal_X0, pcal_X1], and are further transformed by a |
* (possibly non-linear) transformation function given by "pcal_type" |
* and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ |
* defines below, and the PNG-Group's PNG extensions document for a |
* complete description of the transformations and how they should be |
* implemented, and for a description of the ASCII parameter strings. |
* Data values are valid if (valid & PNG_INFO_pCAL) non-zero. |
*/ |
png_charp pcal_purpose; /* pCAL chunk description string */ |
png_int_32 pcal_X0; /* minimum value */ |
png_int_32 pcal_X1; /* maximum value */ |
png_charp pcal_units; /* Latin-1 string giving physical units */ |
png_charpp pcal_params; /* ASCII strings containing parameter values */ |
png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */ |
png_byte pcal_nparams; /* number of parameters given in pcal_params */ |
#endif |
|
/* New members added in libpng-1.0.6 */ |
#ifdef PNG_FREE_ME_SUPPORTED |
png_uint_32 free_me; /* flags items libpng is responsible for freeing */ |
#endif |
|
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
/* storage for unknown chunks that the library doesn't recognize. */ |
png_unknown_chunkp unknown_chunks; |
png_size_t unknown_chunks_num; |
#endif |
|
#if defined(PNG_iCCP_SUPPORTED) |
/* iCCP chunk data. */ |
png_charp iccp_name; /* profile name */ |
png_charp iccp_profile; /* International Color Consortium profile data */ |
/* Note to maintainer: should be png_bytep */ |
png_uint_32 iccp_proflen; /* ICC profile data length */ |
png_byte iccp_compression; /* Always zero */ |
#endif |
|
#if defined(PNG_sPLT_SUPPORTED) |
/* data on sPLT chunks (there may be more than one). */ |
png_sPLT_tp splt_palettes; |
png_uint_32 splt_palettes_num; |
#endif |
|
#if defined(PNG_sCAL_SUPPORTED) |
/* The sCAL chunk describes the actual physical dimensions of the |
* subject matter of the graphic. The chunk contains a unit specification |
* a byte value, and two ASCII strings representing floating-point |
* values. The values are width and height corresponsing to one pixel |
* in the image. This external representation is converted to double |
* here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. |
*/ |
png_byte scal_unit; /* unit of physical scale */ |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
double scal_pixel_width; /* width of one pixel */ |
double scal_pixel_height; /* height of one pixel */ |
#endif |
#ifdef PNG_FIXED_POINT_SUPPORTED |
png_charp scal_s_width; /* string containing height */ |
png_charp scal_s_height; /* string containing width */ |
#endif |
#endif |
|
#if defined(PNG_INFO_IMAGE_SUPPORTED) |
/* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ |
/* Data valid if (valid & PNG_INFO_IDAT) non-zero */ |
png_bytepp row_pointers; /* the image bits */ |
#endif |
|
#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) |
png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */ |
#endif |
|
#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) |
png_fixed_point int_x_white; |
png_fixed_point int_y_white; |
png_fixed_point int_x_red; |
png_fixed_point int_y_red; |
png_fixed_point int_x_green; |
png_fixed_point int_y_green; |
png_fixed_point int_x_blue; |
png_fixed_point int_y_blue; |
#endif |
|
} png_info; |
|
typedef png_info FAR * png_infop; |
typedef png_info FAR * FAR * png_infopp; |
|
/* Maximum positive integer used in PNG is (2^31)-1 */ |
#define PNG_MAX_UINT ((png_uint_32)0x7fffffffL) |
|
/* These describe the color_type field in png_info. */ |
/* color type masks */ |
#define PNG_COLOR_MASK_PALETTE 1 |
#define PNG_COLOR_MASK_COLOR 2 |
#define PNG_COLOR_MASK_ALPHA 4 |
|
/* color types. Note that not all combinations are legal */ |
#define PNG_COLOR_TYPE_GRAY 0 |
#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) |
#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) |
#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) |
#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) |
/* aliases */ |
#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA |
#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA |
|
/* This is for compression type. PNG 1.0-1.2 only define the single type. */ |
#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ |
#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE |
|
/* This is for filter type. PNG 1.0-1.2 only define the single type. */ |
#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ |
#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ |
#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE |
|
/* These are for the interlacing type. These values should NOT be changed. */ |
#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ |
#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ |
#define PNG_INTERLACE_LAST 2 /* Not a valid value */ |
|
/* These are for the oFFs chunk. These values should NOT be changed. */ |
#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ |
#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ |
#define PNG_OFFSET_LAST 2 /* Not a valid value */ |
|
/* These are for the pCAL chunk. These values should NOT be changed. */ |
#define PNG_EQUATION_LINEAR 0 /* Linear transformation */ |
#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ |
#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ |
#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ |
#define PNG_EQUATION_LAST 4 /* Not a valid value */ |
|
/* These are for the sCAL chunk. These values should NOT be changed. */ |
#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ |
#define PNG_SCALE_METER 1 /* meters per pixel */ |
#define PNG_SCALE_RADIAN 2 /* radians per pixel */ |
#define PNG_SCALE_LAST 3 /* Not a valid value */ |
|
/* These are for the pHYs chunk. These values should NOT be changed. */ |
#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ |
#define PNG_RESOLUTION_METER 1 /* pixels/meter */ |
#define PNG_RESOLUTION_LAST 2 /* Not a valid value */ |
|
/* These are for the sRGB chunk. These values should NOT be changed. */ |
#define PNG_sRGB_INTENT_PERCEPTUAL 0 |
#define PNG_sRGB_INTENT_RELATIVE 1 |
#define PNG_sRGB_INTENT_SATURATION 2 |
#define PNG_sRGB_INTENT_ABSOLUTE 3 |
#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ |
|
/* This is for text chunks */ |
#define PNG_KEYWORD_MAX_LENGTH 79 |
|
/* Maximum number of entries in PLTE/sPLT/tRNS arrays */ |
#define PNG_MAX_PALETTE_LENGTH 256 |
|
/* These determine if an ancillary chunk's data has been successfully read |
* from the PNG header, or if the application has filled in the corresponding |
* data in the info_struct to be written into the output file. The values |
* of the PNG_INFO_<chunk> defines should NOT be changed. |
*/ |
#define PNG_INFO_gAMA 0x0001 |
#define PNG_INFO_sBIT 0x0002 |
#define PNG_INFO_cHRM 0x0004 |
#define PNG_INFO_PLTE 0x0008 |
#define PNG_INFO_tRNS 0x0010 |
#define PNG_INFO_bKGD 0x0020 |
#define PNG_INFO_hIST 0x0040 |
#define PNG_INFO_pHYs 0x0080 |
#define PNG_INFO_oFFs 0x0100 |
#define PNG_INFO_tIME 0x0200 |
#define PNG_INFO_pCAL 0x0400 |
#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ |
#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 */ |
|
/* This is used for the transformation routines, as some of them |
* change these values for the row. It also should enable using |
* the routines for other purposes. |
*/ |
typedef struct png_row_info_struct |
{ |
png_uint_32 width; /* width of row */ |
png_uint_32 rowbytes; /* number of bytes in row */ |
png_byte color_type; /* color type of row */ |
png_byte bit_depth; /* bit depth of row */ |
png_byte channels; /* number of channels (1, 2, 3, or 4) */ |
png_byte pixel_depth; /* bits per pixel (depth * channels) */ |
} png_row_info; |
|
typedef png_row_info FAR * png_row_infop; |
typedef png_row_info FAR * FAR * png_row_infopp; |
|
/* 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 |
* and error functions, while the png_rw_ptr type should match that of the |
* user read/write data functions. |
*/ |
typedef struct png_struct_def png_struct; |
typedef png_struct FAR * png_structp; |
|
typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); |
typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); |
typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); |
typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, |
int)); |
typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, |
int)); |
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); |
typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); |
typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, |
png_uint_32, int)); |
#endif |
|
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ |
defined(PNG_LEGACY_SUPPORTED) |
typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, |
png_row_infop, png_bytep)); |
#endif |
|
#if defined(PNG_USER_CHUNKS_SUPPORTED) |
typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); |
#endif |
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); |
#endif |
|
/* Transform masks for the high-level interface */ |
#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ |
#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ |
#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ |
#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ |
#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ |
#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ |
#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ |
#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ |
#define PNG_TRANSFORM_BGR 0x0080 /* read and write */ |
#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ |
#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ |
#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ |
#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE 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 |
|
typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); |
typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); |
|
/* The structure that holds the information to read and write PNG files. |
* The only people who need to care about what is inside of this are the |
* people who will be modifying the library for their own special needs. |
* It should NOT be accessed directly by an application, except to store |
* the jmp_buf. |
*/ |
|
struct png_struct_def |
{ |
#ifdef PNG_SETJMP_SUPPORTED |
jmp_buf jmpbuf; /* used in png_error */ |
#endif |
png_error_ptr error_fn; /* function for printing errors and aborting */ |
png_error_ptr warning_fn; /* function for printing warnings */ |
png_voidp error_ptr; /* user supplied struct for error functions */ |
png_rw_ptr write_data_fn; /* function for writing output data */ |
png_rw_ptr read_data_fn; /* function for reading input data */ |
png_voidp io_ptr; /* ptr to application struct for I/O functions */ |
|
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) |
png_user_transform_ptr read_user_transform_fn; /* user read transform */ |
#endif |
|
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
png_user_transform_ptr write_user_transform_fn; /* user write transform */ |
#endif |
|
/* These were added in libpng-1.0.2 */ |
#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) |
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
png_voidp user_transform_ptr; /* user supplied struct for user transform */ |
png_byte user_transform_depth; /* bit depth of user transformed pixels */ |
png_byte user_transform_channels; /* channels in user transformed pixels */ |
#endif |
#endif |
|
png_uint_32 mode; /* tells us where we are in the PNG file */ |
png_uint_32 flags; /* flags indicating various things to libpng */ |
png_uint_32 transformations; /* which transformations to perform */ |
|
z_stream zstream; /* pointer to decompression structure (below) */ |
png_bytep zbuf; /* buffer for zlib */ |
png_size_t zbuf_size; /* size of zbuf */ |
int zlib_level; /* holds zlib compression level */ |
int zlib_method; /* holds zlib compression method */ |
int zlib_window_bits; /* holds zlib compression window bits */ |
int zlib_mem_level; /* holds zlib compression memory level */ |
int zlib_strategy; /* holds zlib compression strategy */ |
|
png_uint_32 width; /* width of image in pixels */ |
png_uint_32 height; /* height of image in pixels */ |
png_uint_32 num_rows; /* number of rows in current pass */ |
png_uint_32 usr_width; /* width of row at start of write */ |
png_uint_32 rowbytes; /* size of row in bytes */ |
png_uint_32 irowbytes; /* size of current interlaced row in bytes */ |
png_uint_32 iwidth; /* width of current interlaced row in pixels */ |
png_uint_32 row_number; /* current row in interlace pass */ |
png_bytep prev_row; /* buffer to save previous (unfiltered) row */ |
png_bytep row_buf; /* buffer to save current (unfiltered) row */ |
png_bytep sub_row; /* buffer to save "sub" row when filtering */ |
png_bytep up_row; /* buffer to save "up" row when filtering */ |
png_bytep avg_row; /* buffer to save "avg" row when filtering */ |
png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ |
png_row_info row_info; /* used for transformation routines */ |
|
png_uint_32 idat_size; /* current IDAT size for read */ |
png_uint_32 crc; /* current chunk CRC value */ |
png_colorp palette; /* palette from the input file */ |
png_uint_16 num_palette; /* number of color entries in palette */ |
png_uint_16 num_trans; /* number of transparency values */ |
png_byte chunk_name[5]; /* null-terminated name of current chunk */ |
png_byte compression; /* file compression type (always 0) */ |
png_byte filter; /* file filter type (always 0) */ |
png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ |
png_byte pass; /* current interlace pass (0 - 6) */ |
png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ |
png_byte color_type; /* color type of file */ |
png_byte bit_depth; /* bit depth of file */ |
png_byte usr_bit_depth; /* bit depth of users row */ |
png_byte pixel_depth; /* number of bits per pixel */ |
png_byte channels; /* number of channels in file */ |
png_byte usr_channels; /* channels at start of write */ |
png_byte sig_bytes; /* magic bytes read/written from start of file */ |
|
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
#ifdef PNG_LEGACY_SUPPORTED |
png_byte filler; /* filler byte for pixel expansion */ |
#else |
png_uint_16 filler; /* filler bytes for pixel expansion */ |
#endif |
#endif |
|
#if defined(PNG_bKGD_SUPPORTED) |
png_byte background_gamma_type; |
# ifdef PNG_FLOATING_POINT_SUPPORTED |
float background_gamma; |
# endif |
png_color_16 background; /* background color in screen gamma space */ |
#if defined(PNG_READ_GAMMA_SUPPORTED) |
png_color_16 background_1; /* background normalized to gamma 1.0 */ |
#endif |
#endif /* PNG_bKGD_SUPPORTED */ |
|
#if defined(PNG_WRITE_FLUSH_SUPPORTED) |
png_flush_ptr output_flush_fn;/* Function for flushing output */ |
png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ |
png_uint_32 flush_rows; /* number of rows written since last flush */ |
#endif |
|
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
int gamma_shift; /* number of "insignificant" bits 16-bit gamma */ |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
float gamma; /* file gamma value */ |
float screen_gamma; /* screen gamma value (display_exponent) */ |
#endif |
#endif |
|
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
png_bytep gamma_table; /* gamma table for 8-bit depth files */ |
png_bytep gamma_from_1; /* converts from 1.0 to screen */ |
png_bytep gamma_to_1; /* converts from file to 1.0 */ |
png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ |
png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ |
png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ |
#endif |
|
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) |
png_color_8 sig_bit; /* significant bits in each available channel */ |
#endif |
|
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
png_color_8 shift; /* shift for significant bit tranformation */ |
#endif |
|
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ |
|| defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
png_bytep trans; /* transparency values for paletted files */ |
png_color_16 trans_values; /* transparency values for non-paletted files */ |
#endif |
|
png_read_status_ptr read_row_fn; /* called after each row is decoded */ |
png_write_status_ptr write_row_fn; /* called after each row is encoded */ |
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
png_progressive_info_ptr info_fn; /* called after header data fully read */ |
png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */ |
png_progressive_end_ptr end_fn; /* called after image is complete */ |
png_bytep save_buffer_ptr; /* current location in save_buffer */ |
png_bytep save_buffer; /* buffer for previously read data */ |
png_bytep current_buffer_ptr; /* current location in current_buffer */ |
png_bytep current_buffer; /* buffer for recently used data */ |
png_uint_32 push_length; /* size of current input chunk */ |
png_uint_32 skip_length; /* bytes to skip in input data */ |
png_size_t save_buffer_size; /* amount of data now in save_buffer */ |
png_size_t save_buffer_max; /* total size of save_buffer */ |
png_size_t buffer_size; /* total amount of available input data */ |
png_size_t current_buffer_size; /* amount of data now in current_buffer */ |
int process_mode; /* what push library is currently doing */ |
int cur_palette; /* current push library palette index */ |
|
# if defined(PNG_TEXT_SUPPORTED) |
png_size_t current_text_size; /* current size of text input data */ |
png_size_t current_text_left; /* how much text left to read in input */ |
png_charp current_text; /* current text chunk buffer */ |
png_charp current_text_ptr; /* current location in current_text */ |
# endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */ |
|
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
|
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) |
/* for the Borland special 64K segment handler */ |
png_bytepp offset_table_ptr; |
png_bytep offset_table; |
png_uint_16 offset_table_number; |
png_uint_16 offset_table_count; |
png_uint_16 offset_table_count_free; |
#endif |
|
#if defined(PNG_READ_DITHER_SUPPORTED) |
png_bytep palette_lookup; /* lookup table for dithering */ |
png_bytep dither_index; /* index translation for palette files */ |
#endif |
|
#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) |
png_uint_16p hist; /* histogram */ |
#endif |
|
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
png_byte heuristic_method; /* heuristic for row filter selection */ |
png_byte num_prev_filters; /* number of weights for previous rows */ |
png_bytep prev_filters; /* filter type(s) of previous row(s) */ |
png_uint_16p filter_weights; /* weight(s) for previous line(s) */ |
png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ |
png_uint_16p filter_costs; /* relative filter calculation cost */ |
png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ |
#endif |
|
#if defined(PNG_TIME_RFC1123_SUPPORTED) |
png_charp time_buffer; /* String to hold RFC 1123 time text */ |
#endif |
|
/* New members added in libpng-1.0.6 */ |
|
#ifdef PNG_FREE_ME_SUPPORTED |
png_uint_32 free_me; /* flags items libpng is responsible for freeing */ |
#endif |
|
#if defined(PNG_USER_CHUNKS_SUPPORTED) |
png_voidp user_chunk_ptr; |
png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ |
#endif |
|
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
int num_chunk_list; |
png_bytep chunk_list; |
#endif |
|
/* New members added in libpng-1.0.3 */ |
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
png_byte rgb_to_gray_status; |
/* These were changed from png_byte in libpng-1.0.6 */ |
png_uint_16 rgb_to_gray_red_coeff; |
png_uint_16 rgb_to_gray_green_coeff; |
png_uint_16 rgb_to_gray_blue_coeff; |
#endif |
|
/* New member added in libpng-1.0.4 (renamed in 1.0.9) */ |
#if defined(PNG_MNG_FEATURES_SUPPORTED) || \ |
defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ |
defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) |
/* changed from png_byte to png_uint_32 at version 1.2.0 */ |
#ifdef PNG_1_0_X |
png_byte mng_features_permitted; |
#else |
png_uint_32 mng_features_permitted; |
#endif /* PNG_1_0_X */ |
#endif |
|
/* New member added in libpng-1.0.7 */ |
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
png_fixed_point int_gamma; |
#endif |
|
/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ |
#if defined(PNG_MNG_FEATURES_SUPPORTED) |
png_byte filter_type; |
#endif |
|
#if defined(PNG_1_0_X) || (defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD)) |
/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ |
png_uint_32 row_buf_size; |
#endif |
|
/* New members added in libpng-1.2.0 */ |
#if !defined(PNG_1_0_X) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
png_byte mmx_bitdepth_threshold; |
png_uint_32 mmx_rowbytes_threshold; |
png_uint_32 asm_flags; |
#endif |
|
/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ |
#ifdef PNG_USER_MEM_SUPPORTED |
png_voidp mem_ptr; /* user supplied struct for mem functions */ |
png_malloc_ptr malloc_fn; /* function for allocating memory */ |
png_free_ptr free_fn; /* function for freeing memory */ |
#endif |
|
/* New member added in libpng-1.0.13 and 1.2.0 */ |
png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ |
|
#if defined(PNG_READ_DITHER_SUPPORTED) |
/* The following three members were added at version 1.0.14 and 1.2.4 */ |
png_bytep dither_sort; /* working sort array */ |
png_bytep index_to_palette; /* where the original index currently is */ |
/* in the palette */ |
png_bytep palette_to_index; /* which original index points to this */ |
/* palette color */ |
#endif |
|
}; |
|
|
/* This prevents a compiler error in png.c if png.c and png.h are both at |
version 1.2.5 |
*/ |
typedef png_structp version_1_2_5; |
|
typedef png_struct FAR * FAR * png_structpp; |
|
/* Here are the function definitions most commonly used. This is not |
* the place to find out how to use libpng. See libpng.txt for the |
* full explanation, see example.c for the summary. This just provides |
* a simple one line description of the use of each function. |
*/ |
|
/* Returns the version number of the library */ |
extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); |
|
/* Tell lib we have already handled the first <num_bytes> magic bytes. |
* Handling more than 8 bytes from the beginning of the file is an error. |
*/ |
extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, |
int num_bytes)); |
|
/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a |
* PNG file. Returns zero if the supplied bytes match the 8-byte PNG |
* signature, and non-zero otherwise. Having num_to_check == 0 or |
* start > 7 will always fail (ie return non-zero). |
*/ |
extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, |
png_size_t num_to_check)); |
|
/* Simple signature checking function. This is the same as calling |
* png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). |
*/ |
extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)); |
|
/* Allocate and initialize png_ptr struct for reading, and any other memory. */ |
extern PNG_EXPORT(png_structp,png_create_read_struct) |
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
png_error_ptr error_fn, png_error_ptr warn_fn)); |
|
/* Allocate and initialize png_ptr struct for writing, and any other memory */ |
extern PNG_EXPORT(png_structp,png_create_write_struct) |
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
png_error_ptr error_fn, png_error_ptr warn_fn)); |
|
extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) |
PNGARG((png_structp png_ptr)); |
|
extern PNG_EXPORT(void,png_set_compression_buffer_size) |
PNGARG((png_structp png_ptr, png_uint_32 size)); |
|
/* Reset the compression stream */ |
extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); |
|
/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ |
#ifdef PNG_USER_MEM_SUPPORTED |
extern PNG_EXPORT(png_structp,png_create_read_struct_2) |
PNGARG((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)); |
extern PNG_EXPORT(png_structp,png_create_write_struct_2) |
PNGARG((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)); |
#endif |
|
/* Write a PNG chunk - size, type, (optional) data, CRC. */ |
extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, |
png_bytep chunk_name, png_bytep data, png_size_t length)); |
|
/* Write the start of a PNG chunk - length and chunk name. */ |
extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, |
png_bytep chunk_name, png_uint_32 length)); |
|
/* Write the data of a PNG chunk started with png_write_chunk_start(). */ |
extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, |
png_bytep data, png_size_t length)); |
|
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */ |
extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); |
|
/* Allocate and initialize the info structure */ |
extern PNG_EXPORT(png_infop,png_create_info_struct) |
PNGARG((png_structp png_ptr)); |
|
/* Initialize the info structure (old interface - DEPRECATED) */ |
extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)); |
#undef png_info_init |
#define png_info_init(info_ptr) png_info_init_3(&info_ptr, sizeof(png_info)); |
extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, |
png_size_t png_info_struct_size)); |
|
/* Writes all the PNG information before the image. */ |
extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
|
/* read the information before the actual image data. */ |
extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
|
#if defined(PNG_TIME_RFC1123_SUPPORTED) |
extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) |
PNGARG((png_structp png_ptr, png_timep ptime)); |
#endif |
|
#if !defined(_WIN32_WCE) |
/* "time.h" functions are not supported on WindowsCE */ |
#if defined(PNG_WRITE_tIME_SUPPORTED) |
/* convert from a struct tm to png_time */ |
extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, |
struct tm FAR * ttime)); |
|
/* convert from time_t to png_time. Uses gmtime() */ |
extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, |
time_t ttime)); |
#endif /* PNG_WRITE_tIME_SUPPORTED */ |
#endif /* _WIN32_WCE */ |
|
#if defined(PNG_READ_EXPAND_SUPPORTED) |
/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ |
extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); |
extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr)); |
extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); |
extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); |
#endif |
|
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
/* Use blue, green, red order for pixels. */ |
extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); |
#endif |
|
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) |
/* Expand the grayscale to 24-bit RGB if necessary. */ |
extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); |
#endif |
|
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
/* Reduce RGB to grayscale. */ |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, |
int error_action, double red, double green )); |
#endif |
extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, |
int error_action, png_fixed_point red, png_fixed_point green )); |
extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp |
png_ptr)); |
#endif |
|
extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, |
png_colorp palette)); |
|
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); |
#endif |
|
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); |
#endif |
|
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ |
defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); |
#endif |
|
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
/* Add a filler byte to 24-bit RGB images. */ |
extern PNG_EXPORT(void,png_set_filler) PNGARG((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 |
#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ |
|
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
/* Swap bytes in 16-bit depth files. */ |
extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); |
#endif |
|
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ |
extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); |
#endif |
|
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
/* Swap packing order of pixels in bytes. */ |
extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); |
#endif |
|
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
/* Converts files to legal bit depths. */ |
extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, |
png_color_8p true_bits)); |
#endif |
|
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
defined(PNG_WRITE_INTERLACING_SUPPORTED) |
/* Have the code handle the interlacing. Returns the number of passes. */ |
extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); |
#endif |
|
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
/* Invert monochrome files */ |
extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); |
#endif |
|
#if defined(PNG_READ_BACKGROUND_SUPPORTED) |
/* Handle alpha and tRNS by replacing with a background color. */ |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, |
png_color_16p background_color, int background_gamma_code, |
int need_expand, double background_gamma)); |
#endif |
#define PNG_BACKGROUND_GAMMA_UNKNOWN 0 |
#define PNG_BACKGROUND_GAMMA_SCREEN 1 |
#define PNG_BACKGROUND_GAMMA_FILE 2 |
#define PNG_BACKGROUND_GAMMA_UNIQUE 3 |
#endif |
|
#if defined(PNG_READ_16_TO_8_SUPPORTED) |
/* strip the second byte of information from a 16-bit depth file. */ |
extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); |
#endif |
|
#if defined(PNG_READ_DITHER_SUPPORTED) |
/* Turn on dithering, and reduce the palette to the number of colors available. */ |
extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, |
png_colorp palette, int num_palette, int maximum_colors, |
png_uint_16p histogram, int full_dither)); |
#endif |
|
#if defined(PNG_READ_GAMMA_SUPPORTED) |
/* Handle gamma correction. Screen_gamma=(display_exponent) */ |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, |
double screen_gamma, double default_file_gamma)); |
#endif |
#endif |
|
#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ |
defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) |
/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ |
/* Deprecated and will be removed. Use png_permit_mng_features() instead. */ |
extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, |
int empty_plte_permitted)); |
#endif |
|
#if defined(PNG_WRITE_FLUSH_SUPPORTED) |
/* Set how many lines between output flushes - 0 for no flushing */ |
extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); |
/* Flush the current PNG output buffer */ |
extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); |
#endif |
|
/* optional update palette with requested transformations */ |
extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); |
|
/* optional call to update the users info structure */ |
extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
|
/* read one or more rows of image data. */ |
extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, |
png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); |
|
/* read a row of data. */ |
extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, |
png_bytep row, |
png_bytep display_row)); |
|
/* read the whole image into memory at once. */ |
extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, |
png_bytepp image)); |
|
/* write a row of image data */ |
extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, |
png_bytep row)); |
|
/* write a few rows of image data */ |
extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, |
png_bytepp row, png_uint_32 num_rows)); |
|
/* write the image data */ |
extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, |
png_bytepp image)); |
|
/* writes the end of the PNG file. */ |
extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
|
/* read the end of the PNG file. */ |
extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
|
/* free any memory associated with the png_info_struct */ |
extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, |
png_infopp info_ptr_ptr)); |
|
/* free any memory associated with the png_struct and the png_info_structs */ |
extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp |
png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); |
|
/* free all memory used by the read (old method - NOT DLL EXPORTED) */ |
extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_infop end_info_ptr)); |
|
/* free any memory associated with the png_struct and the png_info_structs */ |
extern PNG_EXPORT(void,png_destroy_write_struct) |
PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); |
|
/* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ |
extern void png_write_destroy PNGARG((png_structp png_ptr)); |
|
/* set the libpng method of handling chunk CRC errors */ |
extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, |
int crit_action, int ancil_action)); |
|
/* Values for png_set_crc_action() to 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, |
* whereas in version 0.90 and later, the action for CRC errors in ancillary |
* chunks is warn/discard. These values should NOT be changed. |
* |
* value action:critical action:ancillary |
*/ |
#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ |
#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ |
#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ |
#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ |
#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ |
#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ |
|
/* These functions give the user control over the scan-line filtering in |
* libpng and the compression methods used by zlib. These functions are |
* mainly useful for testing, as the defaults should work with most users. |
* Those users who are tight on memory or want faster performance at the |
* expense of compression can modify them. See the compression library |
* header file (zlib.h) for an explination of the compression functions. |
*/ |
|
/* set the filtering method(s) used by libpng. Currently, the only valid |
* value for "method" is 0. |
*/ |
extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, |
int filters)); |
|
/* Flags for png_set_filter() to say which filters to use. The flags |
* are chosen so that they don't conflict with real filter types |
* below, in case they are supplied instead of the #defined constants. |
* These values should NOT be changed. |
*/ |
#define PNG_NO_FILTERS 0x00 |
#define PNG_FILTER_NONE 0x08 |
#define PNG_FILTER_SUB 0x10 |
#define PNG_FILTER_UP 0x20 |
#define PNG_FILTER_AVG 0x40 |
#define PNG_FILTER_PAETH 0x80 |
#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ |
PNG_FILTER_AVG | PNG_FILTER_PAETH) |
|
/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. |
* These defines should NOT be changed. |
*/ |
#define PNG_FILTER_VALUE_NONE 0 |
#define PNG_FILTER_VALUE_SUB 1 |
#define PNG_FILTER_VALUE_UP 2 |
#define PNG_FILTER_VALUE_AVG 3 |
#define PNG_FILTER_VALUE_PAETH 4 |
#define PNG_FILTER_VALUE_LAST 5 |
|
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ |
/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ |
* defines, either the default (minimum-sum-of-absolute-differences), or |
* the experimental method (weighted-minimum-sum-of-absolute-differences). |
* |
* Weights are factors >= 1.0, indicating how important it is to keep the |
* filter type consistent between rows. Larger numbers mean the current |
* filter is that many times as likely to be the same as the "num_weights" |
* previous filters. This is cumulative for each previous row with a weight. |
* There needs to be "num_weights" values in "filter_weights", or it can be |
* NULL if the weights aren't being specified. Weights have no influence on |
* the selection of the first row filter. Well chosen weights can (in theory) |
* improve the compression for a given image. |
* |
* Costs are factors >= 1.0 indicating the relative decoding costs of a |
* filter type. Higher costs indicate more decoding expense, and are |
* therefore less likely to be selected over a filter with lower computational |
* costs. There needs to be a value in "filter_costs" for each valid filter |
* type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't |
* setting the costs. Costs try to improve the speed of decompression without |
* unduly increasing the compressed image size. |
* |
* A negative weight or cost indicates the default value is to be used, and |
* values in the range [0.0, 1.0) indicate the value is to remain unchanged. |
* The default values for both weights and costs are currently 1.0, but may |
* change if good general weighting/cost heuristics can be found. If both |
* the weights and costs are set to 1.0, this degenerates the WEIGHTED method |
* to the UNWEIGHTED method, but with added encoding time/computation. |
*/ |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, |
int heuristic_method, int num_weights, png_doublep filter_weights, |
png_doublep filter_costs)); |
#endif |
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
|
/* Heuristic used for row filter selection. These defines should NOT be |
* changed. |
*/ |
#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ |
#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ |
#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ |
#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ |
|
/* 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, |
* these values may not correspond directly to the zlib compression levels. |
*/ |
extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, |
int level)); |
|
extern PNG_EXPORT(void,png_set_compression_mem_level) |
PNGARG((png_structp png_ptr, int mem_level)); |
|
extern PNG_EXPORT(void,png_set_compression_strategy) |
PNGARG((png_structp png_ptr, int strategy)); |
|
extern PNG_EXPORT(void,png_set_compression_window_bits) |
PNGARG((png_structp png_ptr, int window_bits)); |
|
extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, |
int method)); |
|
/* These next functions are called for input/output, memory, and error |
* 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 |
* different manner by calling png_set_???_fn(). See libpng.txt for |
* more information. |
*/ |
|
#if !defined(PNG_NO_STDIO) |
/* Initialize the input/output for the PNG file to the default functions. */ |
extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); |
#endif |
|
/* Replace the (error and abort), and warning functions with user |
* supplied functions. If no messages are to be printed you must still |
* write and use replacement functions. The replacement error_fn should |
* still do a longjmp to the last setjmp location if you are using this |
* method of error handling. If error_fn or warning_fn is NULL, the |
* default function will be used. |
*/ |
|
extern PNG_EXPORT(void,png_set_error_fn) PNGARG((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 */ |
extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); |
|
/* Replace the default data output functions with a user supplied one(s). |
* If buffered output is not used, then output_flush_fn can be set to NULL. |
* If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time |
* output_flush_fn will be ignored (and thus can be NULL). |
*/ |
extern PNG_EXPORT(void,png_set_write_fn) PNGARG((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. */ |
extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, |
png_voidp io_ptr, png_rw_ptr read_data_fn)); |
|
/* Return the user pointer associated with the I/O functions */ |
extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); |
|
extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, |
png_read_status_ptr read_row_fn)); |
|
extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((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). */ |
extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((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 */ |
extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); |
#endif |
|
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
defined(PNG_LEGACY_SUPPORTED) |
extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp |
png_ptr, png_user_transform_ptr read_user_transform_fn)); |
#endif |
|
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ |
defined(PNG_LEGACY_SUPPORTED) |
extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp |
png_ptr, png_user_transform_ptr write_user_transform_fn)); |
#endif |
|
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ |
defined(PNG_LEGACY_SUPPORTED) |
extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((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 */ |
extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) |
PNGARG((png_structp png_ptr)); |
#endif |
|
#ifdef PNG_USER_CHUNKS_SUPPORTED |
extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, |
png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); |
extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp |
png_ptr)); |
#endif |
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
/* Sets the function callbacks for the push reader, and a pointer to a |
* user-defined structure available to the callback functions. |
*/ |
extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((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 */ |
extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) |
PNGARG((png_structp png_ptr)); |
|
/* function to be called when data becomes available */ |
extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); |
|
/* function that combines rows. Not very much different than the |
* png_combine_row() call. Is this even used????? |
*/ |
extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, |
png_bytep old_row, png_bytep new_row)); |
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
|
extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, |
png_uint_32 size)); |
|
#if defined(PNG_1_0_X) |
# define png_malloc_warn png_malloc |
#else |
/* Added at libpng version 1.2.4 */ |
extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, |
png_uint_32 size)); |
#endif |
|
/* frees a pointer allocated by png_malloc() */ |
extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); |
|
#if defined(PNG_1_0_X) |
/* Function to allocate memory for zlib. */ |
extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, |
uInt size)); |
|
/* Function to free memory for zlib */ |
extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); |
#endif |
|
/* Free data that was allocated internally */ |
extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_uint_32 free_me, int num)); |
#ifdef PNG_FREE_ME_SUPPORTED |
/* Reassign responsibility for freeing existing data, whether allocated |
* by libpng or by the application */ |
extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, |
png_infop info_ptr, int freer, png_uint_32 mask)); |
#endif |
/* assignments for png_data_freer */ |
#define PNG_DESTROY_WILL_FREE_DATA 1 |
#define PNG_SET_WILL_FREE_DATA 1 |
#define PNG_USER_WILL_FREE_DATA 2 |
/* Flags for png_ptr->free_me and info_ptr->free_me */ |
#define PNG_FREE_HIST 0x0008 |
#define PNG_FREE_ICCP 0x0010 |
#define PNG_FREE_SPLT 0x0020 |
#define PNG_FREE_ROWS 0x0040 |
#define PNG_FREE_PCAL 0x0080 |
#define PNG_FREE_SCAL 0x0100 |
#define PNG_FREE_UNKN 0x0200 |
#define PNG_FREE_LIST 0x0400 |
#define PNG_FREE_PLTE 0x1000 |
#define PNG_FREE_TRNS 0x2000 |
#define PNG_FREE_TEXT 0x4000 |
#define PNG_FREE_ALL 0x7fff |
#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ |
|
#ifdef PNG_USER_MEM_SUPPORTED |
extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, |
png_uint_32 size)); |
extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, |
png_voidp ptr)); |
#endif |
|
extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, |
png_voidp s1, png_voidp s2, png_uint_32 size)); |
|
extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, |
png_voidp s1, int value, png_uint_32 size)); |
|
#if defined(USE_FAR_KEYWORD) /* memory model conversion function */ |
extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, |
int check)); |
#endif /* USE_FAR_KEYWORD */ |
|
/* Fatal error in PNG image of libpng - can't continue */ |
extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, |
png_const_charp error_message)); |
|
/* The same, but the chunk name is prepended to the error string. */ |
extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, |
png_const_charp error_message)); |
|
/* Non-fatal error in libpng. Can continue, but may have a problem. */ |
extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, |
png_const_charp warning_message)); |
|
/* Non-fatal error in libpng, chunk name is prepended to message. */ |
extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, |
png_const_charp warning_message)); |
|
/* The png_set_<chunk> functions are for storing values in the png_info_struct. |
* Similarly, the png_get_<chunk> calls are used to read values from the |
* png_info_struct, either storing the parameters in the passed variables, or |
* setting pointers into the png_info_struct where the data is stored. The |
* png_get_<chunk> functions return a non-zero value if the data was available |
* in info_ptr, or return zero and do not change any of the parameters if the |
* data was not available. |
* |
* These functions should be used instead of directly accessing png_info |
* to avoid problems with future changes in the size and internal layout of |
* png_info_struct. |
*/ |
/* Returns "flag" if chunk data is valid in info_ptr. */ |
extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_uint_32 flag)); |
|
/* Returns number of bytes needed to hold a transformed row. */ |
extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
|
#if defined(PNG_INFO_IMAGE_SUPPORTED) |
/* Returns row_pointers, which is an array of pointers to scanlines that was |
returned from png_read_png(). */ |
extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
/* Set row_pointers, which is an array of pointers to scanlines for use |
by png_write_png(). */ |
extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_bytepp row_pointers)); |
#endif |
|
/* Returns number of color channels in image. */ |
extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
|
#ifdef PNG_EASY_ACCESS_SUPPORTED |
/* Returns image width in pixels. */ |
extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp |
png_ptr, png_infop info_ptr)); |
|
/* Returns image height in pixels. */ |
extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp |
png_ptr, png_infop info_ptr)); |
|
/* Returns image bit_depth. */ |
extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp |
png_ptr, png_infop info_ptr)); |
|
/* Returns image color_type. */ |
extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp |
png_ptr, png_infop info_ptr)); |
|
/* Returns image filter_type. */ |
extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp |
png_ptr, png_infop info_ptr)); |
|
/* Returns image interlace_type. */ |
extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp |
png_ptr, png_infop info_ptr)); |
|
/* Returns image compression_type. */ |
extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp |
png_ptr, png_infop info_ptr)); |
|
/* Returns image resolution in pixels per meter, from pHYs chunk data. */ |
extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp |
png_ptr, png_infop info_ptr)); |
extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp |
png_ptr, png_infop info_ptr)); |
extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp |
png_ptr, png_infop info_ptr)); |
|
/* Returns pixel aspect ratio, computed from pHYs chunk data. */ |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp |
png_ptr, png_infop info_ptr)); |
#endif |
|
/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ |
extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp |
png_ptr, png_infop info_ptr)); |
extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp |
png_ptr, png_infop info_ptr)); |
extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp |
png_ptr, png_infop info_ptr)); |
extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp |
png_ptr, png_infop info_ptr)); |
|
#endif /* PNG_EASY_ACCESS_SUPPORTED */ |
|
/* Returns pointer to signature string read from PNG header */ |
extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
|
#if defined(PNG_bKGD_SUPPORTED) |
extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_color_16p *background)); |
#endif |
|
#if defined(PNG_bKGD_SUPPORTED) |
extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_color_16p background)); |
#endif |
|
#if defined(PNG_cHRM_SUPPORTED) |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((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)); |
#endif |
#ifdef PNG_FIXED_POINT_SUPPORTED |
extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((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)); |
#endif |
#endif |
|
#if defined(PNG_cHRM_SUPPORTED) |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
extern PNG_EXPORT(void,png_set_cHRM) PNGARG((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)); |
#endif |
#ifdef PNG_FIXED_POINT_SUPPORTED |
extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((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)); |
#endif |
#endif |
|
#if defined(PNG_gAMA_SUPPORTED) |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, |
png_infop info_ptr, double *file_gamma)); |
#endif |
extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_fixed_point *int_file_gamma)); |
#endif |
|
#if defined(PNG_gAMA_SUPPORTED) |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, |
png_infop info_ptr, double file_gamma)); |
#endif |
extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_fixed_point int_file_gamma)); |
#endif |
|
#if defined(PNG_hIST_SUPPORTED) |
extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_uint_16p *hist)); |
#endif |
|
#if defined(PNG_hIST_SUPPORTED) |
extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_uint_16p hist)); |
#endif |
|
extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((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)); |
|
extern PNG_EXPORT(void,png_set_IHDR) PNGARG((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)); |
|
#if defined(PNG_oFFs_SUPPORTED) |
extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, |
int *unit_type)); |
#endif |
|
#if defined(PNG_oFFs_SUPPORTED) |
extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, |
int unit_type)); |
#endif |
|
#if defined(PNG_pCAL_SUPPORTED) |
extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, |
int *type, int *nparams, png_charp *units, png_charpp *params)); |
#endif |
|
#if defined(PNG_pCAL_SUPPORTED) |
extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, |
int type, int nparams, png_charp units, png_charpp params)); |
#endif |
|
#if defined(PNG_pHYs_SUPPORTED) |
extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); |
#endif |
|
#if defined(PNG_pHYs_SUPPORTED) |
extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); |
#endif |
|
extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_colorp *palette, int *num_palette)); |
|
extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_colorp palette, int num_palette)); |
|
#if defined(PNG_sBIT_SUPPORTED) |
extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_color_8p *sig_bit)); |
#endif |
|
#if defined(PNG_sBIT_SUPPORTED) |
extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_color_8p sig_bit)); |
#endif |
|
#if defined(PNG_sRGB_SUPPORTED) |
extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, |
png_infop info_ptr, int *intent)); |
#endif |
|
#if defined(PNG_sRGB_SUPPORTED) |
extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, |
png_infop info_ptr, int intent)); |
extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, |
png_infop info_ptr, int intent)); |
#endif |
|
#if defined(PNG_iCCP_SUPPORTED) |
extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_charpp name, int *compression_type, |
png_charpp profile, png_uint_32 *proflen)); |
/* Note to maintainer: profile should be png_bytepp */ |
#endif |
|
#if defined(PNG_iCCP_SUPPORTED) |
extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_charp name, int compression_type, |
png_charp profile, png_uint_32 proflen)); |
/* Note to maintainer: profile should be png_bytep */ |
#endif |
|
#if defined(PNG_sPLT_SUPPORTED) |
extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_sPLT_tpp entries)); |
#endif |
|
#if defined(PNG_sPLT_SUPPORTED) |
extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_sPLT_tp entries, int nentries)); |
#endif |
|
#if defined(PNG_TEXT_SUPPORTED) |
/* png_get_text also returns the number of text chunks in *num_text */ |
extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_textp *text_ptr, int *num_text)); |
#endif |
|
/* |
* 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 |
* they will never be NULL pointers. |
*/ |
|
#if defined(PNG_TEXT_SUPPORTED) |
extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_textp text_ptr, int num_text)); |
#endif |
|
#if defined(PNG_tIME_SUPPORTED) |
extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_timep *mod_time)); |
#endif |
|
#if defined(PNG_tIME_SUPPORTED) |
extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_timep mod_time)); |
#endif |
|
#if defined(PNG_tRNS_SUPPORTED) |
extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_bytep *trans, int *num_trans, |
png_color_16p *trans_values)); |
#endif |
|
#if defined(PNG_tRNS_SUPPORTED) |
extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_bytep trans, int num_trans, |
png_color_16p trans_values)); |
#endif |
|
#if defined(PNG_tRNS_SUPPORTED) |
#endif |
|
#if defined(PNG_sCAL_SUPPORTED) |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, |
png_infop info_ptr, int *unit, double *width, double *height)); |
#else |
#ifdef PNG_FIXED_POINT_SUPPORTED |
extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, |
png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); |
#endif |
#endif |
#endif /* PNG_sCAL_SUPPORTED */ |
|
#if defined(PNG_sCAL_SUPPORTED) |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, |
png_infop info_ptr, int unit, double width, double height)); |
#endif |
#ifdef PNG_FIXED_POINT_SUPPORTED |
extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, |
png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); |
#endif |
#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ |
|
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
/* 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 behavour |
= 1: do not keep |
= 2: keep only if safe-to-copy |
= 3: keep even if unsafe-to-copy |
*/ |
extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp |
png_ptr, int keep, png_bytep chunk_list, int num_chunks)); |
extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); |
extern PNG_EXPORT(void, png_set_unknown_chunk_location) |
PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); |
extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp |
png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); |
#endif |
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep |
chunk_name)); |
#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, |
you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */ |
extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, |
png_infop info_ptr, int mask)); |
|
#if defined(PNG_INFO_IMAGE_SUPPORTED) |
/* The "params" pointer is currently not used and is for future expansion. */ |
extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, |
png_infop info_ptr, |
int transforms, |
png_voidp params)); |
extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, |
png_infop info_ptr, |
int transforms, |
png_voidp params)); |
#endif |
|
/* Define PNG_DEBUG at compile time for debugging information. Higher |
* numbers for PNG_DEBUG mean more debugging information. This has |
* only been added since version 0.95 so it is not implemented throughout |
* libpng yet, but more support will be added as needed. |
*/ |
#ifdef PNG_DEBUG |
#if (PNG_DEBUG > 0) |
#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) |
#include <crtdbg.h> |
#if (PNG_DEBUG > 1) |
#define png_debug(l,m) _RPT0(_CRT_WARN,m) |
#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1) |
#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2) |
#endif |
#else /* PNG_DEBUG_FILE || !_MSC_VER */ |
#ifndef PNG_DEBUG_FILE |
#define PNG_DEBUG_FILE stderr |
#endif /* PNG_DEBUG_FILE */ |
#if (PNG_DEBUG > 1) |
#define png_debug(l,m) \ |
{ \ |
int num_tabs=l; \ |
fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ |
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ |
} |
#define png_debug1(l,m,p1) \ |
{ \ |
int num_tabs=l; \ |
fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ |
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ |
} |
#define png_debug2(l,m,p1,p2) \ |
{ \ |
int num_tabs=l; \ |
fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ |
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ |
} |
#endif /* (PNG_DEBUG > 1) */ |
#endif /* _MSC_VER */ |
#endif /* (PNG_DEBUG > 0) */ |
#endif /* PNG_DEBUG */ |
#ifndef png_debug |
#define png_debug(l, m) |
#endif |
#ifndef png_debug1 |
#define png_debug1(l, m, p1) |
#endif |
#ifndef png_debug2 |
#define png_debug2(l, m, p1, p2) |
#endif |
|
extern PNG_EXPORT(png_bytep,png_sig_bytes) PNGARG((void)); |
|
extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); |
extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); |
extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); |
extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); |
|
#ifdef PNG_MNG_FEATURES_SUPPORTED |
extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp |
png_ptr, png_uint_32 mng_features_permitted)); |
#endif |
|
/* Added to version 1.2.0 */ |
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ |
#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ |
#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 |
#define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 |
#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 |
#define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 |
#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 |
#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 |
#define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ |
|
#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ |
| PNG_ASM_FLAG_MMX_READ_INTERLACE \ |
| PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ |
| PNG_ASM_FLAG_MMX_READ_FILTER_UP \ |
| PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ |
| PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) |
#define PNG_MMX_WRITE_FLAGS ( 0 ) |
|
#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ |
| PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ |
| PNG_MMX_READ_FLAGS \ |
| PNG_MMX_WRITE_FLAGS ) |
|
#define PNG_SELECT_READ 1 |
#define PNG_SELECT_WRITE 2 |
|
|
#if !defined(PNG_1_0_X) |
/* pngget.c */ |
extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) |
PNGARG((int flag_select, int *compilerID)); |
|
/* pngget.c */ |
extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) |
PNGARG((int flag_select)); |
|
/* pngget.c */ |
extern PNG_EXPORT(png_uint_32,png_get_asm_flags) |
PNGARG((png_structp png_ptr)); |
|
/* pngget.c */ |
extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) |
PNGARG((png_structp png_ptr)); |
|
/* pngget.c */ |
extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) |
PNGARG((png_structp png_ptr)); |
|
/* pngset.c */ |
extern PNG_EXPORT(void,png_set_asm_flags) |
PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); |
|
/* pngset.c */ |
extern PNG_EXPORT(void,png_set_mmx_thresholds) |
PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, |
png_uint_32 mmx_rowbytes_threshold)); |
|
#endif /* PNG_1_0_X */ |
#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ |
|
#if !defined(PNG_1_0_X) |
/* png.c, pnggccrd.c, or pngvcrd.c */ |
extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); |
|
/* Strip the prepended error numbers ("#nnn ") from error and warning |
* messages before passing them to the error or warning handler. */ |
#ifdef PNG_ERROR_NUMBERS_SUPPORTED |
extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp |
png_ptr, png_uint_32 strip_mode)); |
#endif |
#endif /* PNG_1_0_X */ |
|
/* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */ |
|
#define PNG_HEADER_VERSION_STRING \ |
" libpng version 1.2.5 - October 3, 2002 (header)\n" |
|
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED |
/* With these routines we avoid an integer divide, which will be slower on |
* most machines. However, it does take more operations than the corresponding |
* divide method, so it may be slower on a few RISC systems. There are two |
* shifts (by 8 or 16 bits) and an addition, versus a single integer divide. |
* |
* Note that the rounding factors are NOT supposed to be the same! 128 and |
* 32768 are correct for the NODIV code; 127 and 32767 are correct for the |
* standard method. |
* |
* [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] |
*/ |
|
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ |
|
# define png_composite(composite, fg, alpha, bg) \ |
{ 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); \ |
(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); \ |
(composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } |
|
#else /* standard method using integer division */ |
|
# 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) |
|
# 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) |
|
#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ |
|
/* These next functions are used internally in the code. They generally |
* shouldn't be used unless you are writing code to add or replace some |
* functionality in libpng. More information about most functions can |
* be found in the files where the functions are located. |
*/ |
|
#if defined(PNG_INTERNAL) |
|
/* Various modes of operation. Note that after an init, mode is set to |
* zero automatically when the structure is created. |
*/ |
#define PNG_HAVE_IHDR 0x01 |
#define PNG_HAVE_PLTE 0x02 |
#define PNG_HAVE_IDAT 0x04 |
#define PNG_AFTER_IDAT 0x08 |
#define PNG_HAVE_IEND 0x10 |
#define PNG_HAVE_gAMA 0x20 |
#define PNG_HAVE_cHRM 0x40 |
#define PNG_HAVE_sRGB 0x80 |
#define PNG_HAVE_CHUNK_HEADER 0x100 |
#define PNG_WROTE_tIME 0x200 |
#define PNG_WROTE_INFO_BEFORE_PLTE 0x400 |
#define PNG_BACKGROUND_IS_GRAY 0x800 |
#define PNG_HAVE_PNG_SIGNATURE 0x1000 |
|
/* flags for the transformations the PNG library does on the image data */ |
#define PNG_BGR 0x0001 |
#define PNG_INTERLACE 0x0002 |
#define PNG_PACK 0x0004 |
#define PNG_SHIFT 0x0008 |
#define PNG_SWAP_BYTES 0x0010 |
#define PNG_INVERT_MONO 0x0020 |
#define PNG_DITHER 0x0040 |
#define PNG_BACKGROUND 0x0080 |
#define PNG_BACKGROUND_EXPAND 0x0100 |
/* 0x0200 unused */ |
#define PNG_16_TO_8 0x0400 |
#define PNG_RGBA 0x0800 |
#define PNG_EXPAND 0x1000 |
#define PNG_GAMMA 0x2000 |
#define PNG_GRAY_TO_RGB 0x4000 |
#define PNG_FILLER 0x8000L |
#define PNG_PACKSWAP 0x10000L |
#define PNG_SWAP_ALPHA 0x20000L |
#define PNG_STRIP_ALPHA 0x40000L |
#define PNG_INVERT_ALPHA 0x80000L |
#define PNG_USER_TRANSFORM 0x100000L |
#define PNG_RGB_TO_GRAY_ERR 0x200000L |
#define PNG_RGB_TO_GRAY_WARN 0x400000L |
#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ |
|
/* flags for png_create_struct */ |
#define PNG_STRUCT_PNG 0x0001 |
#define PNG_STRUCT_INFO 0x0002 |
|
/* Scaling factor for filter heuristic weighting calculations */ |
#define PNG_WEIGHT_SHIFT 8 |
#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) |
#define PNG_COST_SHIFT 3 |
#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) |
|
/* flags for the png_ptr->flags rather than declaring a byte for each one */ |
#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 |
#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 |
#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 |
#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 |
#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 |
#define PNG_FLAG_ZLIB_FINISHED 0x0020 |
#define PNG_FLAG_ROW_INIT 0x0040 |
#define PNG_FLAG_FILLER_AFTER 0x0080 |
#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 |
#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 |
#define PNG_FLAG_CRC_CRITICAL_USE 0x0400 |
#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 |
#define PNG_FLAG_FREE_PLTE 0x1000 |
#define PNG_FLAG_FREE_TRNS 0x2000 |
#define PNG_FLAG_FREE_HIST 0x4000 |
#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 |
|
/* For use in png_set_keep_unknown, png_handle_as_unknown */ |
#define HANDLE_CHUNK_AS_DEFAULT 0 |
#define HANDLE_CHUNK_NEVER 1 |
#define HANDLE_CHUNK_IF_SAFE 2 |
#define HANDLE_CHUNK_ALWAYS 3 |
|
#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ |
PNG_FLAG_CRC_ANCILLARY_NOWARN) |
|
#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ |
PNG_FLAG_CRC_CRITICAL_IGNORE) |
|
#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ |
PNG_FLAG_CRC_CRITICAL_MASK) |
|
/* save typing and make code easier to understand */ |
#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ |
abs((int)((c1).green) - (int)((c2).green)) + \ |
abs((int)((c1).blue) - (int)((c2).blue))) |
|
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ |
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) |
/* place to hold the signature string for a PNG file. */ |
#ifdef PNG_USE_GLOBAL_ARRAYS |
PNG_EXPORT_VAR (const png_byte FARDATA) png_sig[8]; |
#else |
#define png_sig png_sig_bytes(NULL) |
#endif |
#endif /* PNG_NO_EXTERN */ |
|
/* Constant strings for known chunk types. If you need to add a chunk, |
* define the name here, and add an invocation of the macro in png.c and |
* wherever it's needed. |
*/ |
#define PNG_IHDR const png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} |
#define PNG_IDAT const png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} |
#define PNG_IEND const png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} |
#define PNG_PLTE const png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} |
#define PNG_bKGD const png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} |
#define PNG_cHRM const png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} |
#define PNG_gAMA const png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} |
#define PNG_hIST const png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} |
#define PNG_iCCP const png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} |
#define PNG_iTXt const png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} |
#define PNG_oFFs const png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} |
#define PNG_pCAL const png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} |
#define PNG_sCAL const png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} |
#define PNG_pHYs const png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} |
#define PNG_sBIT const png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} |
#define PNG_sPLT const png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} |
#define PNG_sRGB const png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} |
#define PNG_tEXt const png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} |
#define PNG_tIME const png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} |
#define PNG_tRNS const png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} |
#define PNG_zTXt const png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} |
|
#ifdef PNG_USE_GLOBAL_ARRAYS |
PNG_EXPORT_VAR (const png_byte FARDATA) png_IHDR[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_IDAT[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_IEND[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_PLTE[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_bKGD[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_cHRM[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_gAMA[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_hIST[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_iCCP[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_iTXt[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_oFFs[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_pCAL[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_sCAL[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_pHYs[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_sBIT[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_sPLT[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_sRGB[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_tEXt[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_tIME[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_tRNS[5]; |
PNG_EXPORT_VAR (const png_byte FARDATA) png_zTXt[5]; |
#endif /* PNG_USE_GLOBAL_ARRAYS */ |
|
|
/* Inline macros to do direct reads of bytes from the input buffer. These |
* require that you are using an architecture that uses PNG byte ordering |
* (MSB first) and supports unaligned data storage. I think that PowerPC |
* in big-endian mode and 680x0 are the only ones that will support this. |
* The x86 line of processors definitely do not. The png_get_int_32() |
* routine also assumes we are using two's complement format for negative |
* values, which is almost certainly true. |
*/ |
#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED) |
# if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED) |
# define png_get_int_32(buf) ( *((png_int_32p) (buf))) |
# endif |
# define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) |
# define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) |
#else |
# if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED) |
PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf)); |
# endif |
PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf)); |
PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf)); |
#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ |
|
/* Initialize png_ptr struct for reading, and allocate any other memory. |
* (old interface - DEPRECATED - use png_create_read_struct instead). |
*/ |
extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)); |
#undef png_read_init |
#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ |
PNG_LIBPNG_VER_STRING, sizeof(png_struct)); |
extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, |
png_const_charp user_png_ver, png_size_t png_struct_size)); |
extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, |
png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t |
png_info_size)); |
|
/* Initialize png_ptr struct for writing, and allocate any other memory. |
* (old interface - DEPRECATED - use png_create_write_struct instead). |
*/ |
extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)); |
#undef png_write_init |
#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ |
PNG_LIBPNG_VER_STRING, sizeof(png_struct)); |
extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, |
png_const_charp user_png_ver, png_size_t png_struct_size)); |
extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, |
png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t |
png_info_size)); |
|
/* Allocate memory for an internal libpng struct */ |
PNG_EXTERN png_voidp png_create_struct PNGARG((int type)); |
|
/* Free memory from internal libpng struct */ |
PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); |
|
PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr |
malloc_fn, png_voidp mem_ptr)); |
PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, |
png_free_ptr free_fn, png_voidp mem_ptr)); |
|
/* Free any memory that info_ptr points to and reset struct. */ |
PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
|
#ifndef PNG_1_0_X |
/* Function to allocate memory for zlib. */ |
PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size)); |
|
/* Function to free memory for zlib */ |
PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); |
|
/* Next four functions are used internally as callbacks. PNGAPI is required |
* but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */ |
|
PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, |
png_bytep data, png_size_t length)); |
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, |
png_bytep buffer, png_size_t length)); |
#endif |
|
PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, |
png_bytep data, png_size_t length)); |
|
#if defined(PNG_WRITE_FLUSH_SUPPORTED) |
#if !defined(PNG_NO_STDIO) |
PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)); |
#endif |
#endif |
#else /* PNG_1_0_X */ |
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, |
png_bytep buffer, png_size_t length)); |
#endif |
#endif /* PNG_1_0_X */ |
|
/* Reset the CRC variable */ |
PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); |
|
/* Write the "data" buffer to whatever output you are using. */ |
PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, |
png_size_t length)); |
|
/* Read data from whatever input you are using into the "data" buffer */ |
PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, |
png_size_t length)); |
|
/* Read bytes into buf, and update png_ptr->crc */ |
PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, |
png_size_t length)); |
|
/* Decompress data in a chunk that uses compression */ |
#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ |
defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) |
PNG_EXTERN png_charp png_decompress_chunk PNGARG((png_structp png_ptr, |
int comp_type, png_charp chunkdata, png_size_t chunklength, |
png_size_t prefix_length, png_size_t *data_length)); |
#endif |
|
/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ |
PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); |
|
/* Read the CRC from the file and compare it to the libpng calculated CRC */ |
PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); |
|
/* Calculate the CRC over a section of data. Note that we are only |
* passing a maximum of 64K on systems that have this as a memory limit, |
* since this is the maximum buffer size we can specify. |
*/ |
PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, |
png_size_t length)); |
|
#if defined(PNG_WRITE_FLUSH_SUPPORTED) |
PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); |
#endif |
|
|
/* Place a 32-bit number into a buffer in PNG byte order (big-endian). |
* The only currently known PNG chunks that use signed numbers are |
* the ancillary extension chunks, oFFs and pCAL. |
*/ |
PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i)); |
|
#if defined(PNG_WRITE_pCAL_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED) |
PNG_EXTERN void png_save_int_32 PNGARG((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, |
* just to avoid potential problems on pre-ANSI C compilers. |
*/ |
PNG_EXTERN void png_save_uint_16 PNGARG((png_bytep buf, unsigned int i)); |
|
/* simple function to write the signature */ |
PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)); |
|
/* write various chunks */ |
|
/* Write the IHDR chunk, and update the png_struct with the necessary |
* information. |
*/ |
PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, |
png_uint_32 height, |
int bit_depth, int color_type, int compression_method, int filter_method, |
int interlace_method)); |
|
PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, |
png_uint_32 num_pal)); |
|
PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, |
png_size_t length)); |
|
PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); |
|
#if defined(PNG_WRITE_gAMA_SUPPORTED) |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); |
#endif |
#ifdef PNG_FIXED_POINT_SUPPORTED |
PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point |
file_gamma)); |
#endif |
#endif |
|
#if defined(PNG_WRITE_sBIT_SUPPORTED) |
PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, |
int color_type)); |
#endif |
|
#if defined(PNG_WRITE_cHRM_SUPPORTED) |
#ifdef PNG_FLOATING_POINT_SUPPORTED |
PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, |
double white_x, double white_y, |
double red_x, double red_y, double green_x, double green_y, |
double blue_x, double blue_y)); |
#endif |
#ifdef PNG_FIXED_POINT_SUPPORTED |
PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, |
png_fixed_point int_white_x, png_fixed_point int_white_y, |
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
png_fixed_point int_blue_y)); |
#endif |
#endif |
|
#if defined(PNG_WRITE_sRGB_SUPPORTED) |
PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, |
int intent)); |
#endif |
|
#if defined(PNG_WRITE_iCCP_SUPPORTED) |
PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, |
png_charp name, int compression_type, |
png_charp profile, int proflen)); |
/* Note to maintainer: profile should be png_bytep */ |
#endif |
|
#if defined(PNG_WRITE_sPLT_SUPPORTED) |
PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, |
png_sPLT_tp palette)); |
#endif |
|
#if defined(PNG_WRITE_tRNS_SUPPORTED) |
PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, |
png_color_16p values, int number, int color_type)); |
#endif |
|
#if defined(PNG_WRITE_bKGD_SUPPORTED) |
PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, |
png_color_16p values, int color_type)); |
#endif |
|
#if defined(PNG_WRITE_hIST_SUPPORTED) |
PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, |
int num_hist)); |
#endif |
|
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ |
defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) |
PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, |
png_charp key, png_charpp new_key)); |
#endif |
|
#if defined(PNG_WRITE_tEXt_SUPPORTED) |
PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, |
png_charp text, png_size_t text_len)); |
#endif |
|
#if defined(PNG_WRITE_zTXt_SUPPORTED) |
PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, |
png_charp text, png_size_t text_len, int compression)); |
#endif |
|
#if defined(PNG_WRITE_iTXt_SUPPORTED) |
PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, |
int compression, png_charp key, png_charp lang, png_charp lang_key, |
png_charp text)); |
#endif |
|
#if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */ |
PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_textp text_ptr, int num_text)); |
#endif |
|
#if defined(PNG_WRITE_oFFs_SUPPORTED) |
PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, |
png_int_32 x_offset, png_int_32 y_offset, int unit_type)); |
#endif |
|
#if defined(PNG_WRITE_pCAL_SUPPORTED) |
PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, |
png_int_32 X0, png_int_32 X1, int type, int nparams, |
png_charp units, png_charpp params)); |
#endif |
|
#if defined(PNG_WRITE_pHYs_SUPPORTED) |
PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, |
png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, |
int unit_type)); |
#endif |
|
#if defined(PNG_WRITE_tIME_SUPPORTED) |
PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, |
png_timep mod_time)); |
#endif |
|
#if defined(PNG_WRITE_sCAL_SUPPORTED) |
#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) |
PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, |
int unit, double width, double height)); |
#else |
#ifdef PNG_FIXED_POINT_SUPPORTED |
PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, |
int unit, png_charp width, png_charp height)); |
#endif |
#endif |
#endif |
|
/* Called when finished processing a row of data */ |
PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); |
|
/* Internal use only. Called before first row of data */ |
PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); |
|
#if defined(PNG_READ_GAMMA_SUPPORTED) |
PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)); |
#endif |
|
/* combine a row of data, dealing with alpha, etc. if requested */ |
PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, |
int mask)); |
|
#if defined(PNG_READ_INTERLACING_SUPPORTED) |
/* expand an interlaced row */ |
/* OLD pre-1.0.9 interface: |
PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, |
png_bytep row, int pass, png_uint_32 transformations)); |
*/ |
PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)); |
#endif |
|
/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ |
|
#if defined(PNG_WRITE_INTERLACING_SUPPORTED) |
/* grab pixels out of a row for an interlaced pass */ |
PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, |
png_bytep row, int pass)); |
#endif |
|
/* unfilter a row */ |
PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, |
png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter)); |
|
/* Choose the best filter to use and filter the row data */ |
PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, |
png_row_infop row_info)); |
|
/* Write out the filtered row. */ |
PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, |
png_bytep filtered_row)); |
/* finish a row while reading, dealing with interlacing passes, etc. */ |
PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); |
|
/* initialize the row buffers, etc. */ |
PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); |
/* optional call to update the users info structure */ |
PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
|
/* these are the functions that do the transformations */ |
#if defined(PNG_READ_FILLER_SUPPORTED) |
PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, |
png_bytep row, png_uint_32 filler, png_uint_32 flags)); |
#endif |
|
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) |
PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, |
png_bytep row)); |
#endif |
|
#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, |
png_bytep row)); |
#endif |
|
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) |
PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, |
png_bytep row)); |
#endif |
|
#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, |
png_bytep row)); |
#endif |
|
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \ |
defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, |
png_bytep row, png_uint_32 flags)); |
#endif |
|
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); |
#endif |
|
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); |
#endif |
|
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop |
row_info, png_bytep row)); |
#endif |
|
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) |
PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, |
png_bytep row)); |
#endif |
|
#if defined(PNG_READ_PACK_SUPPORTED) |
PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row)); |
#endif |
|
#if defined(PNG_READ_SHIFT_SUPPORTED) |
PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, |
png_color_8p sig_bits)); |
#endif |
|
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); |
#endif |
|
#if defined(PNG_READ_16_TO_8_SUPPORTED) |
PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); |
#endif |
|
#if defined(PNG_READ_DITHER_SUPPORTED) |
PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, |
png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup)); |
|
# if defined(PNG_CORRECT_PALETTE_SUPPORTED) |
PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, |
png_colorp palette, int num_palette)); |
# endif |
#endif |
|
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row)); |
#endif |
|
#if defined(PNG_WRITE_PACK_SUPPORTED) |
PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, |
png_bytep row, png_uint_32 bit_depth)); |
#endif |
|
#if defined(PNG_WRITE_SHIFT_SUPPORTED) |
PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, |
png_color_8p bit_depth)); |
#endif |
|
#if defined(PNG_READ_BACKGROUND_SUPPORTED) |
#if defined(PNG_READ_GAMMA_SUPPORTED) |
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, |
png_color_16p trans_values, png_color_16p background, |
png_color_16p background_1, |
png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, |
png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, |
png_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_color_16p trans_values, png_color_16p background)); |
#endif |
#endif |
|
#if defined(PNG_READ_GAMMA_SUPPORTED) |
PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, |
png_bytep gamma_table, png_uint_16pp gamma_16_table, |
int gamma_shift)); |
#endif |
|
#if defined(PNG_READ_EXPAND_SUPPORTED) |
PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, |
png_bytep row, png_colorp palette, png_bytep trans, int num_trans)); |
PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, |
png_bytep row, png_color_16p trans_value)); |
#endif |
|
/* The following decodes the appropriate chunks, and does error correction, |
* then calls the appropriate callback for the chunk if it is valid. |
*/ |
|
/* decode the IHDR chunk */ |
PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
|
#if defined(PNG_READ_bKGD_SUPPORTED) |
PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif |
|
#if defined(PNG_READ_cHRM_SUPPORTED) |
PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif |
|
#if defined(PNG_READ_gAMA_SUPPORTED) |
PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif |
|
#if defined(PNG_READ_hIST_SUPPORTED) |
PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif |
|
#if defined(PNG_READ_iCCP_SUPPORTED) |
extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif /* PNG_READ_iCCP_SUPPORTED */ |
|
#if defined(PNG_READ_iTXt_SUPPORTED) |
PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif |
|
#if defined(PNG_READ_oFFs_SUPPORTED) |
PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif |
|
#if defined(PNG_READ_pCAL_SUPPORTED) |
PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif |
|
#if defined(PNG_READ_pHYs_SUPPORTED) |
PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif |
|
#if defined(PNG_READ_sBIT_SUPPORTED) |
PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif |
|
#if defined(PNG_READ_sCAL_SUPPORTED) |
PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif |
|
#if defined(PNG_READ_sPLT_SUPPORTED) |
extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif /* PNG_READ_sPLT_SUPPORTED */ |
|
#if defined(PNG_READ_sRGB_SUPPORTED) |
PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif |
|
#if defined(PNG_READ_tEXt_SUPPORTED) |
PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif |
|
#if defined(PNG_READ_tIME_SUPPORTED) |
PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif |
|
#if defined(PNG_READ_tRNS_SUPPORTED) |
PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif |
|
#if defined(PNG_READ_zTXt_SUPPORTED) |
PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
png_uint_32 length)); |
#endif |
|
PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_uint_32 length)); |
|
PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, |
png_bytep chunk_name)); |
|
/* handle the transformations for reading and writing */ |
PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); |
PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); |
|
PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); |
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); |
PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, |
png_uint_32 length)); |
PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); |
PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); |
PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, |
png_bytep buffer, png_size_t buffer_length)); |
PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); |
PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, |
png_bytep buffer, png_size_t buffer_length)); |
PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); |
PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_uint_32 length)); |
PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); |
PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); |
#if defined(PNG_READ_tEXt_SUPPORTED) |
PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_uint_32 length)); |
PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
#endif |
#if defined(PNG_READ_zTXt_SUPPORTED) |
PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_uint_32 length)); |
PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
#endif |
#if defined(PNG_READ_iTXt_SUPPORTED) |
PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, |
png_infop info_ptr, png_uint_32 length)); |
PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, |
png_infop info_ptr)); |
#endif |
|
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
|
#ifdef PNG_MNG_FEATURES_SUPPORTED |
PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, |
png_bytep row)); |
PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, |
png_bytep row)); |
#endif |
|
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
/* png.c */ /* PRIVATE */ |
PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)); |
#endif |
/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ |
|
#endif /* PNG_INTERNAL */ |
|
#ifdef __cplusplus |
} |
#endif |
|
#endif /* PNG_VERSION_INFO_ONLY */ |
/* do not put anything past this line */ |
#endif /* PNG_H */ |