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Update libpng to 1.6.29
This commit is contained in:
Tao Schreiner
293
Externals/libpng/pngstruct.h
vendored
293
Externals/libpng/pngstruct.h
vendored
@ -1,12 +1,11 @@
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/* pngstruct.h - header file for PNG reference library
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*
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* Copyright (c) 1998-2011 Glenn Randers-Pehrson
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* Last changed in libpng 1.6.28 [January 5, 2017]
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* Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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*
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* Last changed in libpng 1.5.0 [January 6, 2011]
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*
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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@ -24,16 +23,135 @@
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* in this structure and is required for decompressing the LZ compressed
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* data in PNG files.
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*/
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#ifndef ZLIB_CONST
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/* We must ensure that zlib uses 'const' in declarations. */
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# define ZLIB_CONST
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#endif
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#include "zlib.h"
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#ifdef const
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/* zlib.h sometimes #defines const to nothing, undo this. */
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# undef const
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#endif
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/* zlib.h has mediocre z_const use before 1.2.6, this stuff is for compatibility
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* with older builds.
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*/
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#if ZLIB_VERNUM < 0x1260
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# define PNGZ_MSG_CAST(s) png_constcast(char*,s)
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# define PNGZ_INPUT_CAST(b) png_constcast(png_bytep,b)
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#else
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# define PNGZ_MSG_CAST(s) (s)
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# define PNGZ_INPUT_CAST(b) (b)
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#endif
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/* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib
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* can handle at once. This type need be no larger than 16 bits (so maximum of
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* 65535), this define allows us to discover how big it is, but limited by the
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* maximuum for png_size_t. The value can be overriden in a library build
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* (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably
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* lower value (e.g. 255 works). A lower value may help memory usage (slightly)
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* and may even improve performance on some systems (and degrade it on others.)
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*/
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#ifndef ZLIB_IO_MAX
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# define ZLIB_IO_MAX ((uInt)-1)
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#endif
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#ifdef PNG_WRITE_SUPPORTED
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/* The type of a compression buffer list used by the write code. */
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typedef struct png_compression_buffer
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{
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struct png_compression_buffer *next;
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png_byte output[1]; /* actually zbuf_size */
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} png_compression_buffer, *png_compression_bufferp;
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#define PNG_COMPRESSION_BUFFER_SIZE(pp)\
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(offsetof(png_compression_buffer, output) + (pp)->zbuffer_size)
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#endif
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/* Colorspace support; structures used in png_struct, png_info and in internal
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* functions to hold and communicate information about the color space.
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*
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* PNG_COLORSPACE_SUPPORTED is only required if the application will perform
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* colorspace corrections, otherwise all the colorspace information can be
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* skipped and the size of libpng can be reduced (significantly) by compiling
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* out the colorspace support.
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*/
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#ifdef PNG_COLORSPACE_SUPPORTED
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/* The chromaticities of the red, green and blue colorants and the chromaticity
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* of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)).
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*/
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typedef struct png_xy
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{
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png_fixed_point redx, redy;
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png_fixed_point greenx, greeny;
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png_fixed_point bluex, bluey;
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png_fixed_point whitex, whitey;
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} png_xy;
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/* The same data as above but encoded as CIE XYZ values. When this data comes
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* from chromaticities the sum of the Y values is assumed to be 1.0
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*/
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typedef struct png_XYZ
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{
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png_fixed_point red_X, red_Y, red_Z;
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png_fixed_point green_X, green_Y, green_Z;
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png_fixed_point blue_X, blue_Y, blue_Z;
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} png_XYZ;
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#endif /* COLORSPACE */
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#if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
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/* A colorspace is all the above plus, potentially, profile information;
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* however at present libpng does not use the profile internally so it is only
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* stored in the png_info struct (if iCCP is supported.) The rendering intent
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* is retained here and is checked.
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*
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* The file gamma encoding information is also stored here and gamma correction
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* is done by libpng, whereas color correction must currently be done by the
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* application.
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*/
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typedef struct png_colorspace
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{
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#ifdef PNG_GAMMA_SUPPORTED
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png_fixed_point gamma; /* File gamma */
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#endif
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#ifdef PNG_COLORSPACE_SUPPORTED
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png_xy end_points_xy; /* End points as chromaticities */
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png_XYZ end_points_XYZ; /* End points as CIE XYZ colorant values */
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png_uint_16 rendering_intent; /* Rendering intent of a profile */
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#endif
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/* Flags are always defined to simplify the code. */
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png_uint_16 flags; /* As defined below */
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} png_colorspace, * PNG_RESTRICT png_colorspacerp;
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typedef const png_colorspace * PNG_RESTRICT png_const_colorspacerp;
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/* General flags for the 'flags' field */
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#define PNG_COLORSPACE_HAVE_GAMMA 0x0001
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#define PNG_COLORSPACE_HAVE_ENDPOINTS 0x0002
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#define PNG_COLORSPACE_HAVE_INTENT 0x0004
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#define PNG_COLORSPACE_FROM_gAMA 0x0008
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#define PNG_COLORSPACE_FROM_cHRM 0x0010
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#define PNG_COLORSPACE_FROM_sRGB 0x0020
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#define PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB 0x0040
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#define PNG_COLORSPACE_MATCHES_sRGB 0x0080 /* exact match on profile */
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#define PNG_COLORSPACE_INVALID 0x8000
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#define PNG_COLORSPACE_CANCEL(flags) (0xffff ^ (flags))
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#endif /* COLORSPACE || GAMMA */
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struct png_struct_def
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{
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#ifdef PNG_SETJMP_SUPPORTED
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jmp_buf png_jmpbuf; /* used in png_error */
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jmp_buf jmp_buf_local; /* New name in 1.6.0 for jmp_buf in png_struct */
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png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */
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jmp_buf *jmp_buf_ptr; /* passed to longjmp_fn */
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size_t jmp_buf_size; /* size of the above, if allocated */
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#endif
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png_error_ptr error_fn; /* function for printing errors and aborting */
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#ifdef PNG_WARNINGS_SUPPORTED
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png_error_ptr warning_fn; /* function for printing warnings */
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#endif
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png_voidp error_ptr; /* user supplied struct for error functions */
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png_rw_ptr write_data_fn; /* function for writing output data */
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png_rw_ptr read_data_fn; /* function for reading input data */
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@ -61,14 +179,36 @@ struct png_struct_def
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png_uint_32 flags; /* flags indicating various things to libpng */
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png_uint_32 transformations; /* which transformations to perform */
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z_stream zstream; /* pointer to decompression structure (below) */
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png_bytep zbuf; /* buffer for zlib */
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uInt zbuf_size; /* size of zbuf (typically 65536) */
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png_uint_32 zowner; /* ID (chunk type) of zstream owner, 0 if none */
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z_stream zstream; /* decompression structure */
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#ifdef PNG_WRITE_SUPPORTED
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png_compression_bufferp zbuffer_list; /* Created on demand during write */
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uInt zbuffer_size; /* size of the actual buffer */
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int zlib_level; /* holds zlib compression level */
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int zlib_method; /* holds zlib compression method */
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int zlib_window_bits; /* holds zlib compression window bits */
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int zlib_mem_level; /* holds zlib compression memory level */
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int zlib_strategy; /* holds zlib compression strategy */
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#endif
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/* Added at libpng 1.5.4 */
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#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
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int zlib_text_level; /* holds zlib compression level */
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int zlib_text_method; /* holds zlib compression method */
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int zlib_text_window_bits; /* holds zlib compression window bits */
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int zlib_text_mem_level; /* holds zlib compression memory level */
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int zlib_text_strategy; /* holds zlib compression strategy */
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#endif
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/* End of material added at libpng 1.5.4 */
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/* Added at libpng 1.6.0 */
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#ifdef PNG_WRITE_SUPPORTED
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int zlib_set_level; /* Actual values set into the zstream on write */
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int zlib_set_method;
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int zlib_set_window_bits;
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int zlib_set_mem_level;
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int zlib_set_strategy;
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#endif
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png_uint_32 width; /* width of image in pixels */
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png_uint_32 height; /* height of image in pixels */
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@ -77,45 +217,68 @@ struct png_struct_def
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png_size_t rowbytes; /* size of row in bytes */
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png_uint_32 iwidth; /* width of current interlaced row in pixels */
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png_uint_32 row_number; /* current row in interlace pass */
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png_bytep prev_row; /* buffer to save previous (unfiltered) row */
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png_bytep row_buf; /* buffer to save current (unfiltered) row */
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png_bytep sub_row; /* buffer to save "sub" row when filtering */
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png_bytep up_row; /* buffer to save "up" row when filtering */
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png_bytep avg_row; /* buffer to save "avg" row when filtering */
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png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
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png_row_info row_info; /* used for transformation routines */
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png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */
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png_bytep prev_row; /* buffer to save previous (unfiltered) row.
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* While reading this is a pointer into
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* big_prev_row; while writing it is separately
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* allocated if needed.
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*/
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png_bytep row_buf; /* buffer to save current (unfiltered) row.
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* While reading, this is a pointer into
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* big_row_buf; while writing it is separately
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* allocated.
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*/
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#ifdef PNG_WRITE_FILTER_SUPPORTED
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png_bytep try_row; /* buffer to save trial row when filtering */
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png_bytep tst_row; /* buffer to save best trial row when filtering */
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#endif
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png_size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */
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png_uint_32 idat_size; /* current IDAT size for read */
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png_uint_32 crc; /* current chunk CRC value */
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png_colorp palette; /* palette from the input file */
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png_uint_16 num_palette; /* number of color entries in palette */
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/* Added at libpng-1.5.10 */
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#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
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int num_palette_max; /* maximum palette index found in IDAT */
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#endif
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png_uint_16 num_trans; /* number of transparency values */
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png_byte chunk_name[5]; /* null-terminated name of current chunk */
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png_byte compression; /* file compression type (always 0) */
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png_byte filter; /* file filter type (always 0) */
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png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
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png_byte pass; /* current interlace pass (0 - 6) */
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png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
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png_byte do_filter; /* row filter flags (see PNG_FILTER_ in png.h ) */
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png_byte color_type; /* color type of file */
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png_byte bit_depth; /* bit depth of file */
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png_byte usr_bit_depth; /* bit depth of users row */
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png_byte usr_bit_depth; /* bit depth of users row: write only */
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png_byte pixel_depth; /* number of bits per pixel */
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png_byte channels; /* number of channels in file */
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png_byte usr_channels; /* channels at start of write */
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#ifdef PNG_WRITE_SUPPORTED
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png_byte usr_channels; /* channels at start of write: write only */
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#endif
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png_byte sig_bytes; /* magic bytes read/written from start of file */
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png_byte maximum_pixel_depth;
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/* pixel depth used for the row buffers */
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png_byte transformed_pixel_depth;
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/* pixel depth after read/write transforms */
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#if ZLIB_VERNUM >= 0x1240
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png_byte zstream_start; /* at start of an input zlib stream */
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#endif /* Zlib >= 1.2.4 */
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#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
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png_uint_16 filler; /* filler bytes for pixel expansion */
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#endif
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#ifdef PNG_bKGD_SUPPORTED
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#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
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defined(PNG_READ_ALPHA_MODE_SUPPORTED)
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png_byte background_gamma_type;
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png_fixed_point background_gamma;
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png_color_16 background; /* background color in screen gamma space */
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#ifdef PNG_READ_GAMMA_SUPPORTED
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png_color_16 background_1; /* background normalized to gamma 1.0 */
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#endif
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#endif /* PNG_bKGD_SUPPORTED */
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#endif /* bKGD */
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#ifdef PNG_WRITE_FLUSH_SUPPORTED
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png_flush_ptr output_flush_fn; /* Function for flushing output */
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@ -123,19 +286,20 @@ struct png_struct_def
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png_uint_32 flush_rows; /* number of rows written since last flush */
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#endif
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#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
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#ifdef PNG_READ_GAMMA_SUPPORTED
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int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */
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png_fixed_point gamma; /* file gamma value */
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png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */
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#endif
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#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
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png_bytep gamma_table; /* gamma table for 8-bit depth files */
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png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
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#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
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defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
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defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
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png_bytep gamma_from_1; /* converts from 1.0 to screen */
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png_bytep gamma_to_1; /* converts from file to 1.0 */
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png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
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png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
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png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
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#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
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#endif
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#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
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@ -171,14 +335,7 @@ struct png_struct_def
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int process_mode; /* what push library is currently doing */
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int cur_palette; /* current push library palette index */
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# ifdef PNG_TEXT_SUPPORTED
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png_size_t current_text_size; /* current size of text input data */
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png_size_t current_text_left; /* how much text left to read in input */
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png_charp current_text; /* current text chunk buffer */
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png_charp current_text_ptr; /* current location in current_text */
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# endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */
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#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
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#endif /* PROGRESSIVE_READ */
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#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
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/* For the Borland special 64K segment handler */
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@ -194,22 +351,16 @@ struct png_struct_def
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png_bytep quantize_index; /* index translation for palette files */
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#endif
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#if defined(PNG_READ_QUANTIZE_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
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png_uint_16p hist; /* histogram */
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#endif
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#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
|
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png_byte heuristic_method; /* heuristic for row filter selection */
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png_byte num_prev_filters; /* number of weights for previous rows */
|
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png_bytep prev_filters; /* filter type(s) of previous row(s) */
|
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png_uint_16p filter_weights; /* weight(s) for previous line(s) */
|
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png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
|
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png_uint_16p filter_costs; /* relative filter calculation cost */
|
||||
png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
|
||||
/* Options */
|
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#ifdef PNG_SET_OPTION_SUPPORTED
|
||||
png_uint_32 options; /* On/off state (up to 16 options) */
|
||||
#endif
|
||||
|
||||
#if PNG_LIBPNG_VER < 10700
|
||||
/* To do: remove this from libpng-1.7 */
|
||||
#ifdef PNG_TIME_RFC1123_SUPPORTED
|
||||
png_charp time_buffer; /* String to hold RFC 1123 time text */
|
||||
char time_buffer[29]; /* String to hold RFC 1123 time text */
|
||||
#endif
|
||||
#endif
|
||||
|
||||
/* New members added in libpng-1.0.6 */
|
||||
@ -218,27 +369,31 @@ struct png_struct_def
|
||||
|
||||
#ifdef PNG_USER_CHUNKS_SUPPORTED
|
||||
png_voidp user_chunk_ptr;
|
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#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
|
||||
png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
|
||||
int num_chunk_list;
|
||||
png_bytep chunk_list;
|
||||
#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
|
||||
int unknown_default; /* As PNG_HANDLE_* */
|
||||
unsigned int num_chunk_list; /* Number of entries in the list */
|
||||
png_bytep chunk_list; /* List of png_byte[5]; the textual chunk name
|
||||
* followed by a PNG_HANDLE_* byte */
|
||||
#endif
|
||||
|
||||
/* New members added in libpng-1.0.3 */
|
||||
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
|
||||
png_byte rgb_to_gray_status;
|
||||
/* Added in libpng 1.5.5 to record setting of coefficients: */
|
||||
png_byte rgb_to_gray_coefficients_set;
|
||||
/* 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;
|
||||
/* deleted in 1.5.5: 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)
|
||||
#if defined(PNG_MNG_FEATURES_SUPPORTED)
|
||||
/* Changed from png_byte to png_uint_32 at version 1.2.0 */
|
||||
png_uint_32 mng_features_permitted;
|
||||
#endif
|
||||
@ -288,21 +443,41 @@ struct png_struct_def
|
||||
#endif
|
||||
|
||||
/* New member added in libpng-1.0.25 and 1.2.17 */
|
||||
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
|
||||
/* Storage for unknown chunk that the library doesn't recognize. */
|
||||
#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
|
||||
/* Temporary storage for unknown chunk that the library doesn't recognize,
|
||||
* used while reading the chunk.
|
||||
*/
|
||||
png_unknown_chunk unknown_chunk;
|
||||
#endif
|
||||
|
||||
/* New members added in libpng-1.2.26 */
|
||||
/* New member added in libpng-1.2.26 */
|
||||
png_size_t old_big_row_buf_size;
|
||||
png_size_t old_prev_row_size;
|
||||
|
||||
#ifdef PNG_READ_SUPPORTED
|
||||
/* New member added in libpng-1.2.30 */
|
||||
png_charp chunkdata; /* buffer for reading chunk data */
|
||||
png_bytep read_buffer; /* buffer for reading chunk data */
|
||||
png_alloc_size_t read_buffer_size; /* current size of the buffer */
|
||||
#endif
|
||||
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
||||
uInt IDAT_read_size; /* limit on read buffer size for IDAT */
|
||||
#endif
|
||||
|
||||
#ifdef PNG_IO_STATE_SUPPORTED
|
||||
/* New member added in libpng-1.4.0 */
|
||||
png_uint_32 io_state;
|
||||
#endif
|
||||
|
||||
/* New member added in libpng-1.5.6 */
|
||||
png_bytep big_prev_row;
|
||||
|
||||
/* New member added in libpng-1.5.7 */
|
||||
void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info,
|
||||
png_bytep row, png_const_bytep prev_row);
|
||||
|
||||
#ifdef PNG_READ_SUPPORTED
|
||||
#if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
|
||||
png_colorspace colorspace;
|
||||
#endif
|
||||
#endif
|
||||
};
|
||||
#endif /* PNGSTRUCT_H */
|
||||
|
||||
Reference in New Issue
Block a user