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png.c
14212 lines (11920 loc) · 441 KB
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png.c
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/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% PPPP N N GGGG %
% P P NN N G %
% PPPP N N N G GG %
% P N NN G G %
% P N N GGG %
% %
% %
% Read/Write Portable Network Graphics Image Format %
% %
% Software Design %
% Cristy %
% Glenn Randers-Pehrson %
% November 1997 %
% %
% %
% Copyright 1999-2018 ImageMagick Studio LLC, a non-profit organization %
% dedicated to making software imaging solutions freely available. %
% %
% You may not use this file except in compliance with the License. You may %
% obtain a copy of the License at %
% %
% https://www.imagemagick.org/script/license.php %
% %
% Unless required by applicable law or agreed to in writing, software %
% distributed under the License is distributed on an "AS IS" BASIS, %
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
% See the License for the specific language governing permissions and %
% limitations under the License. %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
#define IM
/*
Include declarations.
*/
#include "MagickCore/studio.h"
#include "MagickCore/artifact.h"
#include "MagickCore/attribute.h"
#include "MagickCore/blob.h"
#include "MagickCore/blob-private.h"
#include "MagickCore/cache.h"
#include "MagickCore/channel.h"
#include "MagickCore/color.h"
#include "MagickCore/color-private.h"
#include "MagickCore/colormap.h"
#include "MagickCore/colorspace.h"
#include "MagickCore/colorspace-private.h"
#include "MagickCore/constitute.h"
#include "MagickCore/enhance.h"
#include "MagickCore/exception.h"
#include "MagickCore/exception-private.h"
#include "MagickCore/geometry.h"
#include "MagickCore/histogram.h"
#include "MagickCore/image.h"
#include "MagickCore/image-private.h"
#include "MagickCore/layer.h"
#include "MagickCore/list.h"
#include "MagickCore/log.h"
#include "MagickCore/MagickCore.h"
#include "MagickCore/memory_.h"
#include "MagickCore/module.h"
#include "MagickCore/monitor.h"
#include "MagickCore/monitor-private.h"
#include "MagickCore/option.h"
#include "MagickCore/pixel.h"
#include "MagickCore/pixel-accessor.h"
#include "MagickCore/profile.h"
#include "MagickCore/property.h"
#include "MagickCore/quantum-private.h"
#include "MagickCore/resource_.h"
#include "MagickCore/semaphore.h"
#include "MagickCore/quantum-private.h"
#include "MagickCore/static.h"
#include "MagickCore/statistic.h"
#include "MagickCore/string_.h"
#include "MagickCore/string-private.h"
#include "MagickCore/transform.h"
#include "MagickCore/utility.h"
#if defined(MAGICKCORE_PNG_DELEGATE)
/* Suppress libpng pedantic warnings that were added in
* libpng-1.2.41 and libpng-1.4.0. If you are working on
* migration to libpng-1.5, remove these defines and then
* fix any code that generates warnings.
*/
/* #define PNG_DEPRECATED Use of this function is deprecated */
/* #define PNG_USE_RESULT The result of this function must be checked */
/* #define PNG_NORETURN This function does not return */
/* #define PNG_ALLOCATED The result of the function is new memory */
/* #define PNG_DEPSTRUCT Access to this struct member is deprecated */
/* PNG_PTR_NORETURN does not work on some platforms, in libpng-1.5.x */
#define PNG_PTR_NORETURN
#include "png.h"
#include "zlib.h"
/* ImageMagick differences */
#define first_scene scene
#if PNG_LIBPNG_VER > 10011
/*
Optional declarations. Define or undefine them as you like.
*/
/* #define PNG_DEBUG -- turning this on breaks VisualC compiling */
/*
Features under construction. Define these to work on them.
*/
#undef MNG_OBJECT_BUFFERS
#undef MNG_BASI_SUPPORTED
#define MNG_COALESCE_LAYERS /* In 5.4.4, this interfered with MMAP'ed files. */
#define MNG_INSERT_LAYERS /* Troublesome, but seem to work as of 5.4.4 */
#if defined(MAGICKCORE_JPEG_DELEGATE)
# define JNG_SUPPORTED /* Not finished as of 5.5.2. See "To do" comments. */
#endif
#if !defined(RGBColorMatchExact)
#define IsPNGColorEqual(color,target) \
(((color).red == (target).red) && \
((color).green == (target).green) && \
((color).blue == (target).blue))
#endif
/* Table of recognized sRGB ICC profiles */
struct sRGB_info_struct
{
png_uint_32 len;
png_uint_32 crc;
png_byte intent;
};
const struct sRGB_info_struct sRGB_info[] =
{
/* ICC v2 perceptual sRGB_IEC61966-2-1_black_scaled.icc */
{ 3048, 0x3b8772b9UL, 0},
/* ICC v2 relative sRGB_IEC61966-2-1_no_black_scaling.icc */
{ 3052, 0x427ebb21UL, 1},
/* ICC v4 perceptual sRGB_v4_ICC_preference_displayclass.icc */
{60988, 0x306fd8aeUL, 0},
/* ICC v4 perceptual sRGB_v4_ICC_preference.icc perceptual */
{60960, 0xbbef7812UL, 0},
/* HP? sRGB v2 media-relative sRGB_IEC61966-2-1_noBPC.icc */
{ 3024, 0x5d5129ceUL, 1},
/* HP-Microsoft sRGB v2 perceptual */
{ 3144, 0x182ea552UL, 0},
/* HP-Microsoft sRGB v2 media-relative */
{ 3144, 0xf29e526dUL, 1},
/* Facebook's "2012/01/25 03:41:57", 524, "TINYsRGB.icc" */
{ 524, 0xd4938c39UL, 0},
/* "2012/11/28 22:35:21", 3212, "Argyll_sRGB.icm") */
{ 3212, 0x034af5a1UL, 0},
/* Not recognized */
{ 0, 0x00000000UL, 0},
};
/* Macros for left-bit-replication to ensure that pixels
* and PixelInfos all have the same image->depth, and for use
* in PNG8 quantization.
*/
/* LBR01: Replicate top bit */
#define LBR01PacketRed(pixelpacket) \
(pixelpacket).red=(ScaleQuantumToChar((pixelpacket).red) < 0x10 ? \
0 : QuantumRange);
#define LBR01PacketGreen(pixelpacket) \
(pixelpacket).green=(ScaleQuantumToChar((pixelpacket).green) < 0x10 ? \
0 : QuantumRange);
#define LBR01PacketBlue(pixelpacket) \
(pixelpacket).blue=(ScaleQuantumToChar((pixelpacket).blue) < 0x10 ? \
0 : QuantumRange);
#define LBR01PacketAlpha(pixelpacket) \
(pixelpacket).alpha=(ScaleQuantumToChar((pixelpacket).alpha) < 0x10 ? \
0 : QuantumRange);
#define LBR01PacketRGB(pixelpacket) \
{ \
LBR01PacketRed((pixelpacket)); \
LBR01PacketGreen((pixelpacket)); \
LBR01PacketBlue((pixelpacket)); \
}
#define LBR01PacketRGBO(pixelpacket) \
{ \
LBR01PacketRGB((pixelpacket)); \
LBR01PacketAlpha((pixelpacket)); \
}
#define LBR01PixelRed(pixel) \
(SetPixelRed(image, \
ScaleQuantumToChar(GetPixelRed(image,(pixel))) < 0x10 ? \
0 : QuantumRange,(pixel)));
#define LBR01PixelGreen(pixel) \
(SetPixelGreen(image, \
ScaleQuantumToChar(GetPixelGreen(image,(pixel))) < 0x10 ? \
0 : QuantumRange,(pixel)));
#define LBR01PixelBlue(pixel) \
(SetPixelBlue(image, \
ScaleQuantumToChar(GetPixelBlue(image,(pixel))) < 0x10 ? \
0 : QuantumRange,(pixel)));
#define LBR01PixelAlpha(pixel) \
(SetPixelAlpha(image, \
ScaleQuantumToChar(GetPixelAlpha(image,(pixel))) < 0x10 ? \
0 : QuantumRange,(pixel)));
#define LBR01PixelRGB(pixel) \
{ \
LBR01PixelRed((pixel)); \
LBR01PixelGreen((pixel)); \
LBR01PixelBlue((pixel)); \
}
#define LBR01PixelRGBA(pixel) \
{ \
LBR01PixelRGB((pixel)); \
LBR01PixelAlpha((pixel)); \
}
/* LBR02: Replicate top 2 bits */
#define LBR02PacketRed(pixelpacket) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar((pixelpacket).red) & 0xc0; \
(pixelpacket).red=ScaleCharToQuantum( \
(lbr_bits | (lbr_bits >> 2) | (lbr_bits >> 4) | (lbr_bits >> 6))); \
}
#define LBR02PacketGreen(pixelpacket) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar((pixelpacket).green) & 0xc0; \
(pixelpacket).green=ScaleCharToQuantum( \
(lbr_bits | (lbr_bits >> 2) | (lbr_bits >> 4) | (lbr_bits >> 6))); \
}
#define LBR02PacketBlue(pixelpacket) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar((pixelpacket).blue) & 0xc0; \
(pixelpacket).blue=ScaleCharToQuantum( \
(lbr_bits | (lbr_bits >> 2) | (lbr_bits >> 4) | (lbr_bits >> 6))); \
}
#define LBR02PacketAlpha(pixelpacket) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar((pixelpacket).alpha) & 0xc0; \
(pixelpacket).alpha=ScaleCharToQuantum( \
(lbr_bits | (lbr_bits >> 2) | (lbr_bits >> 4) | (lbr_bits >> 6))); \
}
#define LBR02PacketRGB(pixelpacket) \
{ \
LBR02PacketRed((pixelpacket)); \
LBR02PacketGreen((pixelpacket)); \
LBR02PacketBlue((pixelpacket)); \
}
#define LBR02PacketRGBO(pixelpacket) \
{ \
LBR02PacketRGB((pixelpacket)); \
LBR02PacketAlpha((pixelpacket)); \
}
#define LBR02PixelRed(pixel) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar(GetPixelRed(image,(pixel))) \
& 0xc0; \
SetPixelRed(image, ScaleCharToQuantum( \
(lbr_bits | (lbr_bits >> 2) | (lbr_bits >> 4) | (lbr_bits >> 6))), \
(pixel)); \
}
#define LBR02PixelGreen(pixel) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar(GetPixelGreen(image,(pixel)))\
& 0xc0; \
SetPixelGreen(image, ScaleCharToQuantum( \
(lbr_bits | (lbr_bits >> 2) | (lbr_bits >> 4) | (lbr_bits >> 6))), \
(pixel)); \
}
#define LBR02PixelBlue(pixel) \
{ \
unsigned char lbr_bits= \
ScaleQuantumToChar(GetPixelBlue(image,(pixel))) & 0xc0; \
SetPixelBlue(image, ScaleCharToQuantum( \
(lbr_bits | (lbr_bits >> 2) | (lbr_bits >> 4) | (lbr_bits >> 6))), \
(pixel)); \
}
#define LBR02PixelAlpha(pixel) \
{ \
unsigned char lbr_bits= \
ScaleQuantumToChar(GetPixelAlpha(image,(pixel))) & 0xc0; \
SetPixelAlpha(image, ScaleCharToQuantum( \
(lbr_bits | (lbr_bits >> 2) | (lbr_bits >> 4) | (lbr_bits >> 6))), \
(pixel) ); \
}
#define LBR02PixelRGB(pixel) \
{ \
LBR02PixelRed((pixel)); \
LBR02PixelGreen((pixel)); \
LBR02PixelBlue((pixel)); \
}
#define LBR02PixelRGBA(pixel) \
{ \
LBR02PixelRGB((pixel)); \
LBR02PixelAlpha((pixel)); \
}
/* LBR03: Replicate top 3 bits (only used with opaque pixels during
PNG8 quantization) */
#define LBR03PacketRed(pixelpacket) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar((pixelpacket).red) & 0xe0; \
(pixelpacket).red=ScaleCharToQuantum( \
(lbr_bits | (lbr_bits >> 3) | (lbr_bits >> 6))); \
}
#define LBR03PacketGreen(pixelpacket) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar((pixelpacket).green) & 0xe0; \
(pixelpacket).green=ScaleCharToQuantum( \
(lbr_bits | (lbr_bits >> 3) | (lbr_bits >> 6))); \
}
#define LBR03PacketBlue(pixelpacket) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar((pixelpacket).blue) & 0xe0; \
(pixelpacket).blue=ScaleCharToQuantum( \
(lbr_bits | (lbr_bits >> 3) | (lbr_bits >> 6))); \
}
#define LBR03PacketRGB(pixelpacket) \
{ \
LBR03PacketRed((pixelpacket)); \
LBR03PacketGreen((pixelpacket)); \
LBR03PacketBlue((pixelpacket)); \
}
#define LBR03PixelRed(pixel) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar(GetPixelRed(image,(pixel))) \
& 0xe0; \
SetPixelRed(image, ScaleCharToQuantum( \
(lbr_bits | (lbr_bits >> 3) | (lbr_bits >> 6))), (pixel)); \
}
#define LBR03Green(pixel) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar(GetPixelGreen(image,(pixel)))\
& 0xe0; \
SetPixelGreen(image, ScaleCharToQuantum( \
(lbr_bits | (lbr_bits >> 3) | (lbr_bits >> 6))), (pixel)); \
}
#define LBR03Blue(pixel) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar(GetPixelBlue(image,(pixel))) \
& 0xe0; \
SetPixelBlue(image, ScaleCharToQuantum( \
(lbr_bits | (lbr_bits >> 3) | (lbr_bits >> 6))), (pixel)); \
}
#define LBR03RGB(pixel) \
{ \
LBR03PixelRed((pixel)); \
LBR03Green((pixel)); \
LBR03Blue((pixel)); \
}
/* LBR04: Replicate top 4 bits */
#define LBR04PacketRed(pixelpacket) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar((pixelpacket).red) & 0xf0; \
(pixelpacket).red=ScaleCharToQuantum((lbr_bits | (lbr_bits >> 4))); \
}
#define LBR04PacketGreen(pixelpacket) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar((pixelpacket).green) & 0xf0; \
(pixelpacket).green=ScaleCharToQuantum((lbr_bits | (lbr_bits >> 4))); \
}
#define LBR04PacketBlue(pixelpacket) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar((pixelpacket).blue) & 0xf0; \
(pixelpacket).blue=ScaleCharToQuantum((lbr_bits | (lbr_bits >> 4))); \
}
#define LBR04PacketAlpha(pixelpacket) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar((pixelpacket).alpha) & 0xf0; \
(pixelpacket).alpha=ScaleCharToQuantum((lbr_bits | (lbr_bits >> 4))); \
}
#define LBR04PacketRGB(pixelpacket) \
{ \
LBR04PacketRed((pixelpacket)); \
LBR04PacketGreen((pixelpacket)); \
LBR04PacketBlue((pixelpacket)); \
}
#define LBR04PacketRGBO(pixelpacket) \
{ \
LBR04PacketRGB((pixelpacket)); \
LBR04PacketAlpha((pixelpacket)); \
}
#define LBR04PixelRed(pixel) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar(GetPixelRed(image,(pixel))) \
& 0xf0; \
SetPixelRed(image,\
ScaleCharToQuantum((lbr_bits | (lbr_bits >> 4))), (pixel)); \
}
#define LBR04PixelGreen(pixel) \
{ \
unsigned char lbr_bits=ScaleQuantumToChar(GetPixelGreen(image,(pixel)))\
& 0xf0; \
SetPixelGreen(image,\
ScaleCharToQuantum((lbr_bits | (lbr_bits >> 4))), (pixel)); \
}
#define LBR04PixelBlue(pixel) \
{ \
unsigned char lbr_bits= \
ScaleQuantumToChar(GetPixelBlue(image,(pixel))) & 0xf0; \
SetPixelBlue(image,\
ScaleCharToQuantum((lbr_bits | (lbr_bits >> 4))), (pixel)); \
}
#define LBR04PixelAlpha(pixel) \
{ \
unsigned char lbr_bits= \
ScaleQuantumToChar(GetPixelAlpha(image,(pixel))) & 0xf0; \
SetPixelAlpha(image,\
ScaleCharToQuantum((lbr_bits | (lbr_bits >> 4))), (pixel)); \
}
#define LBR04PixelRGB(pixel) \
{ \
LBR04PixelRed((pixel)); \
LBR04PixelGreen((pixel)); \
LBR04PixelBlue((pixel)); \
}
#define LBR04PixelRGBA(pixel) \
{ \
LBR04PixelRGB((pixel)); \
LBR04PixelAlpha((pixel)); \
}
/*
Establish thread safety.
setjmp/longjmp is claimed to be safe on these platforms:
setjmp/longjmp is alleged to be unsafe on these platforms:
*/
#ifdef PNG_SETJMP_SUPPORTED
# ifndef IMPNG_SETJMP_IS_THREAD_SAFE
# define IMPNG_SETJMP_NOT_THREAD_SAFE
# endif
# ifdef IMPNG_SETJMP_NOT_THREAD_SAFE
static SemaphoreInfo
*ping_semaphore = (SemaphoreInfo *) NULL;
# endif
#endif
/*
This temporary until I set up malloc'ed object attributes array.
Recompile with MNG_MAX_OBJECTS=65536L to avoid this limit but
waste more memory.
*/
#define MNG_MAX_OBJECTS 256
/*
If this not defined, spec is interpreted strictly. If it is
defined, an attempt will be made to recover from some errors,
including
o global PLTE too short
*/
#undef MNG_LOOSE
/*
Don't try to define PNG_MNG_FEATURES_SUPPORTED here. Make sure
it's defined in libpng/pngconf.h, version 1.0.9 or later. It won't work
with earlier versions of libpng. From libpng-1.0.3a to libpng-1.0.8,
PNG_READ|WRITE_EMPTY_PLTE were used but those have been deprecated in
libpng in favor of PNG_MNG_FEATURES_SUPPORTED, so we set them here.
PNG_MNG_FEATURES_SUPPORTED is disabled by default in libpng-1.0.9 and
will be enabled by default in libpng-1.2.0.
*/
#ifdef PNG_MNG_FEATURES_SUPPORTED
# ifndef PNG_READ_EMPTY_PLTE_SUPPORTED
# define PNG_READ_EMPTY_PLTE_SUPPORTED
# endif
# ifndef PNG_WRITE_EMPTY_PLTE_SUPPORTED
# define PNG_WRITE_EMPTY_PLTE_SUPPORTED
# endif
#endif
/*
Maximum valid size_t in PNG/MNG chunks is (2^31)-1
This macro is only defined in libpng-1.0.3 and later.
Previously it was PNG_MAX_UINT but that was deprecated in libpng-1.2.6
*/
#ifndef PNG_UINT_31_MAX
#define PNG_UINT_31_MAX (png_uint_32) 0x7fffffffL
#endif
/*
Constant strings for known chunk types. If you need to add a chunk,
add a string holding the name here. To make the code more
portable, we use ASCII numbers like this, not characters.
*/
static const png_byte mng_MHDR[5]={ 77, 72, 68, 82, (png_byte) '\0'};
static const png_byte mng_BACK[5]={ 66, 65, 67, 75, (png_byte) '\0'};
static const png_byte mng_BASI[5]={ 66, 65, 83, 73, (png_byte) '\0'};
static const png_byte mng_CLIP[5]={ 67, 76, 73, 80, (png_byte) '\0'};
static const png_byte mng_CLON[5]={ 67, 76, 79, 78, (png_byte) '\0'};
static const png_byte mng_DEFI[5]={ 68, 69, 70, 73, (png_byte) '\0'};
static const png_byte mng_DHDR[5]={ 68, 72, 68, 82, (png_byte) '\0'};
static const png_byte mng_DISC[5]={ 68, 73, 83, 67, (png_byte) '\0'};
static const png_byte mng_ENDL[5]={ 69, 78, 68, 76, (png_byte) '\0'};
static const png_byte mng_FRAM[5]={ 70, 82, 65, 77, (png_byte) '\0'};
static const png_byte mng_IEND[5]={ 73, 69, 78, 68, (png_byte) '\0'};
static const png_byte mng_IHDR[5]={ 73, 72, 68, 82, (png_byte) '\0'};
static const png_byte mng_JHDR[5]={ 74, 72, 68, 82, (png_byte) '\0'};
static const png_byte mng_LOOP[5]={ 76, 79, 79, 80, (png_byte) '\0'};
static const png_byte mng_MAGN[5]={ 77, 65, 71, 78, (png_byte) '\0'};
static const png_byte mng_MEND[5]={ 77, 69, 78, 68, (png_byte) '\0'};
static const png_byte mng_MOVE[5]={ 77, 79, 86, 69, (png_byte) '\0'};
static const png_byte mng_PAST[5]={ 80, 65, 83, 84, (png_byte) '\0'};
static const png_byte mng_PLTE[5]={ 80, 76, 84, 69, (png_byte) '\0'};
static const png_byte mng_SAVE[5]={ 83, 65, 86, 69, (png_byte) '\0'};
static const png_byte mng_SEEK[5]={ 83, 69, 69, 75, (png_byte) '\0'};
static const png_byte mng_SHOW[5]={ 83, 72, 79, 87, (png_byte) '\0'};
static const png_byte mng_TERM[5]={ 84, 69, 82, 77, (png_byte) '\0'};
static const png_byte mng_bKGD[5]={ 98, 75, 71, 68, (png_byte) '\0'};
static const png_byte mng_caNv[5]={ 99, 97, 78, 118, (png_byte) '\0'};
static const png_byte mng_cHRM[5]={ 99, 72, 82, 77, (png_byte) '\0'};
static const png_byte mng_eXIf[5]={101, 88, 73, 102, (png_byte) '\0'};
static const png_byte mng_gAMA[5]={103, 65, 77, 65, (png_byte) '\0'};
static const png_byte mng_iCCP[5]={105, 67, 67, 80, (png_byte) '\0'};
static const png_byte mng_nEED[5]={110, 69, 69, 68, (png_byte) '\0'};
static const png_byte mng_orNT[5]={111, 114, 78, 84, (png_byte) '\0'};
static const png_byte mng_pHYg[5]={112, 72, 89, 103, (png_byte) '\0'};
static const png_byte mng_pHYs[5]={112, 72, 89, 115, (png_byte) '\0'};
static const png_byte mng_sBIT[5]={115, 66, 73, 84, (png_byte) '\0'};
static const png_byte mng_sRGB[5]={115, 82, 71, 66, (png_byte) '\0'};
static const png_byte mng_tRNS[5]={116, 82, 78, 83, (png_byte) '\0'};
static const png_byte mng_vpAg[5]={118, 112, 65, 103, (png_byte) '\0'};
#if defined(JNG_SUPPORTED)
static const png_byte mng_IDAT[5]={ 73, 68, 65, 84, (png_byte) '\0'};
static const png_byte mng_JDAT[5]={ 74, 68, 65, 84, (png_byte) '\0'};
static const png_byte mng_JDAA[5]={ 74, 68, 65, 65, (png_byte) '\0'};
static const png_byte mng_JdAA[5]={ 74, 100, 65, 65, (png_byte) '\0'};
static const png_byte mng_JSEP[5]={ 74, 83, 69, 80, (png_byte) '\0'};
static const png_byte mng_oFFs[5]={111, 70, 70, 115, (png_byte) '\0'};
#endif
#if 0
/* Other known chunks that are not yet supported by ImageMagick: */
static const png_byte mng_hIST[5]={104, 73, 83, 84, (png_byte) '\0'};
static const png_byte mng_iTXt[5]={105, 84, 88, 116, (png_byte) '\0'};
static const png_byte mng_sPLT[5]={115, 80, 76, 84, (png_byte) '\0'};
static const png_byte mng_sTER[5]={115, 84, 69, 82, (png_byte) '\0'};
static const png_byte mng_tEXt[5]={116, 69, 88, 116, (png_byte) '\0'};
static const png_byte mng_tIME[5]={116, 73, 77, 69, (png_byte) '\0'};
static const png_byte mng_zTXt[5]={122, 84, 88, 116, (png_byte) '\0'};
#endif
typedef struct _MngBox
{
long
left,
right,
top,
bottom;
} MngBox;
typedef struct _MngPair
{
volatile long
a,
b;
} MngPair;
#ifdef MNG_OBJECT_BUFFERS
typedef struct _MngBuffer
{
size_t
height,
width;
Image
*image;
png_color
plte[256];
int
reference_count;
unsigned char
alpha_sample_depth,
compression_method,
color_type,
concrete,
filter_method,
frozen,
image_type,
interlace_method,
pixel_sample_depth,
plte_length,
sample_depth,
viewable;
} MngBuffer;
#endif
typedef struct _MngInfo
{
#ifdef MNG_OBJECT_BUFFERS
MngBuffer
*ob[MNG_MAX_OBJECTS];
#endif
Image *
image;
RectangleInfo
page;
int
adjoin,
#ifndef PNG_READ_EMPTY_PLTE_SUPPORTED
bytes_in_read_buffer,
found_empty_plte,
#endif
equal_backgrounds,
equal_chrms,
equal_gammas,
#if defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) || \
defined(PNG_MNG_FEATURES_SUPPORTED)
equal_palettes,
#endif
equal_physs,
equal_srgbs,
framing_mode,
have_global_bkgd,
have_global_chrm,
have_global_gama,
have_global_phys,
have_global_sbit,
have_global_srgb,
have_saved_bkgd_index,
have_write_global_chrm,
have_write_global_gama,
have_write_global_plte,
have_write_global_srgb,
need_fram,
object_id,
old_framing_mode,
saved_bkgd_index;
int
new_number_colors;
ssize_t
image_found,
loop_count[256],
loop_iteration[256],
scenes_found,
x_off[MNG_MAX_OBJECTS],
y_off[MNG_MAX_OBJECTS];
MngBox
clip,
frame,
image_box,
object_clip[MNG_MAX_OBJECTS];
unsigned char
/* These flags could be combined into one byte */
exists[MNG_MAX_OBJECTS],
frozen[MNG_MAX_OBJECTS],
loop_active[256],
invisible[MNG_MAX_OBJECTS],
viewable[MNG_MAX_OBJECTS];
MagickOffsetType
loop_jump[256];
png_colorp
global_plte;
png_color_8
global_sbit;
png_byte
#ifndef PNG_READ_EMPTY_PLTE_SUPPORTED
read_buffer[8],
#endif
global_trns[256];
float
global_gamma;
ChromaticityInfo
global_chrm;
RenderingIntent
global_srgb_intent;
unsigned long
delay,
global_plte_length,
global_trns_length,
global_x_pixels_per_unit,
global_y_pixels_per_unit,
mng_width,
mng_height,
ticks_per_second;
MagickBooleanType
need_blob;
unsigned int
IsPalette,
global_phys_unit_type,
basi_warning,
clon_warning,
dhdr_warning,
jhdr_warning,
magn_warning,
past_warning,
phyg_warning,
phys_warning,
sbit_warning,
show_warning,
mng_type,
write_mng,
write_png_colortype,
write_png_depth,
write_png_compression_level,
write_png_compression_strategy,
write_png_compression_filter,
write_png8,
write_png24,
write_png32,
write_png48,
write_png64;
#ifdef MNG_BASI_SUPPORTED
unsigned long
basi_width,
basi_height;
unsigned int
basi_depth,
basi_color_type,
basi_compression_method,
basi_filter_type,
basi_interlace_method,
basi_red,
basi_green,
basi_blue,
basi_alpha,
basi_viewable;
#endif
png_uint_16
magn_first,
magn_last,
magn_mb,
magn_ml,
magn_mr,
magn_mt,
magn_mx,
magn_my,
magn_methx,
magn_methy;
PixelInfo
mng_global_bkgd;
/* Added at version 6.6.6-7 */
MagickBooleanType
ping_exclude_bKGD,
ping_exclude_cHRM,
ping_exclude_date,
ping_exclude_eXIf,
ping_exclude_EXIF,
ping_exclude_gAMA,
ping_exclude_iCCP,
/* ping_exclude_iTXt, */
ping_exclude_oFFs,
ping_exclude_pHYs,
ping_exclude_sRGB,
ping_exclude_tEXt,
ping_exclude_tRNS,
ping_exclude_caNv,
ping_exclude_zCCP, /* hex-encoded iCCP */
ping_exclude_zTXt,
ping_preserve_colormap,
/* Added at version 6.8.5-7 */
ping_preserve_iCCP,
/* Added at version 6.8.9-9 */
ping_exclude_tIME;
} MngInfo;
#endif /* VER */
/*
Forward declarations.
*/
static MagickBooleanType
WritePNGImage(const ImageInfo *,Image *,ExceptionInfo *);
static MagickBooleanType
WriteMNGImage(const ImageInfo *,Image *,ExceptionInfo *);
#if defined(JNG_SUPPORTED)
static MagickBooleanType
WriteJNGImage(const ImageInfo *,Image *,ExceptionInfo *);
#endif
#if PNG_LIBPNG_VER > 10011
#if (MAGICKCORE_QUANTUM_DEPTH >= 16)
static MagickBooleanType
LosslessReduceDepthOK(Image *image,ExceptionInfo *exception)
{
/* Reduce bit depth if it can be reduced losslessly from 16+ to 8.
*
* This is true if the high byte and the next highest byte of
* each sample of the image, the colormap, and the background color
* are equal to each other. We check this by seeing if the samples
* are unchanged when we scale them down to 8 and back up to Quantum.
*
* We don't use the method GetImageDepth() because it doesn't check
* background and doesn't handle PseudoClass specially.
*/
#define QuantumToCharToQuantumEqQuantum(quantum) \
((ScaleCharToQuantum((unsigned char) ScaleQuantumToChar(quantum))) == quantum)
MagickBooleanType
ok_to_reduce=MagickFalse;
if (image->depth >= 16)
{
const Quantum
*p;
ok_to_reduce=
QuantumToCharToQuantumEqQuantum(image->background_color.red) &&
QuantumToCharToQuantumEqQuantum(image->background_color.green) &&
QuantumToCharToQuantumEqQuantum(image->background_color.blue) ?
MagickTrue : MagickFalse;
if (ok_to_reduce != MagickFalse && image->storage_class == PseudoClass)
{
int indx;
for (indx=0; indx < (ssize_t) image->colors; indx++)
{
ok_to_reduce=(
QuantumToCharToQuantumEqQuantum(
image->colormap[indx].red) &&
QuantumToCharToQuantumEqQuantum(
image->colormap[indx].green) &&
QuantumToCharToQuantumEqQuantum(
image->colormap[indx].blue)) ?
MagickTrue : MagickFalse;
if (ok_to_reduce == MagickFalse)
break;
}
}
if ((ok_to_reduce != MagickFalse) &&
(image->storage_class != PseudoClass))
{
ssize_t
y;
register ssize_t
x;
for (y=0; y < (ssize_t) image->rows; y++)
{
p=GetVirtualPixels(image,0,y,image->columns,1,exception);
if (p == (const Quantum *) NULL)
{
ok_to_reduce = MagickFalse;
break;
}
for (x=(ssize_t) image->columns-1; x >= 0; x--)
{
ok_to_reduce=
QuantumToCharToQuantumEqQuantum(GetPixelRed(image,p)) &&
QuantumToCharToQuantumEqQuantum(GetPixelGreen(image,p)) &&
QuantumToCharToQuantumEqQuantum(GetPixelBlue(image,p)) ?
MagickTrue : MagickFalse;
if (ok_to_reduce == MagickFalse)
break;
p+=GetPixelChannels(image);
}
if (x >= 0)
break;
}
}
if (ok_to_reduce != MagickFalse)
{
(void) LogMagickEvent(CoderEvent,GetMagickModule(),
" OK to reduce PNG bit depth to 8 without loss of info");
}
else
{
(void) LogMagickEvent(CoderEvent,GetMagickModule(),
" Not OK to reduce PNG bit depth to 8 without losing info");
}
}
return ok_to_reduce;
}
#endif /* MAGICKCORE_QUANTUM_DEPTH >= 16 */
static const char* PngColorTypeToString(const unsigned int color_type)
{
const char
*result = "Unknown";
switch (color_type)
{
case PNG_COLOR_TYPE_GRAY:
result = "Gray";
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
result = "Gray+Alpha";
break;
case PNG_COLOR_TYPE_PALETTE:
result = "Palette";
break;
case PNG_COLOR_TYPE_RGB:
result = "RGB";
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
result = "RGB+Alpha";
break;
}
return result;
}
static int
Magick_Orientation_to_Exif_Orientation(const OrientationType orientation)
{
switch (orientation)
{
/* Convert to Exif orientations as defined in "Exchangeable image file
* format for digital still cameras: Exif Version 2.31",
* http://www.cipa.jp/std/documents/e/DC-008-Translation-2016-E.pdf
*/
case TopLeftOrientation:
return 1;
case TopRightOrientation:
return 2;
case BottomRightOrientation:
return 3;
case BottomLeftOrientation:
return 4;
case LeftTopOrientation:
return 5;