| 1 |
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| 2 | /* pngstruct.h - header file for PNG reference library
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| 3 | *
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| 4 | * Copyright (c) 2018-2019 Cosmin Truta
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| 5 | * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
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| 6 | * Copyright (c) 1996-1997 Andreas Dilger
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| 7 | * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
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| 8 | *
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| 9 | * This code is released under the libpng license.
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| 10 | * For conditions of distribution and use, see the disclaimer
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| 11 | * and license in png.h
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| 12 | */
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| 13 |
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| 14 | /* The structure that holds the information to read and write PNG files.
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| 15 | * The only people who need to care about what is inside of this are the
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| 16 | * people who will be modifying the library for their own special needs.
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| 17 | * It should NOT be accessed directly by an application.
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| 18 | */
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| 19 |
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| 20 | #ifndef PNGSTRUCT_H
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| 21 | #define PNGSTRUCT_H
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| 22 | /* zlib.h defines the structure z_stream, an instance of which is included
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| 23 | * in this structure and is required for decompressing the LZ compressed
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| 24 | * data in PNG files.
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| 25 | */
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| 26 | #ifndef ZLIB_CONST
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| 27 | /* We must ensure that zlib uses 'const' in declarations. */
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| 28 | # define ZLIB_CONST
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| 29 | #endif
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| 30 | #include "zlib.h"
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| 31 | #ifdef const
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| 32 | /* zlib.h sometimes #defines const to nothing, undo this. */
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| 33 | # undef const
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| 34 | #endif
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| 35 |
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| 36 | /* zlib.h has mediocre z_const use before 1.2.6, this stuff is for compatibility
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| 37 | * with older builds.
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| 38 | */
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| 39 | #if ZLIB_VERNUM < 0x1260
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| 40 | # define PNGZ_MSG_CAST(s) png_constcast(char*,s)
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| 41 | # define PNGZ_INPUT_CAST(b) png_constcast(png_bytep,b)
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| 42 | #else
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| 43 | # define PNGZ_MSG_CAST(s) (s)
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| 44 | # define PNGZ_INPUT_CAST(b) (b)
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| 45 | #endif
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| 46 |
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| 47 | /* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib
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| 48 | * can handle at once. This type need be no larger than 16 bits (so maximum of
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| 49 | * 65535), this define allows us to discover how big it is, but limited by the
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| 50 | * maximum for size_t. The value can be overridden in a library build
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| 51 | * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably
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| 52 | * lower value (e.g. 255 works). A lower value may help memory usage (slightly)
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| 53 | * and may even improve performance on some systems (and degrade it on others.)
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| 54 | */
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| 55 | #ifndef ZLIB_IO_MAX
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| 56 | # define ZLIB_IO_MAX ((uInt)-1)
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| 57 | #endif
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| 58 |
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| 59 | #ifdef PNG_WRITE_SUPPORTED
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| 60 | /* The type of a compression buffer list used by the write code. */
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| 61 | typedef struct png_compression_buffer
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| 62 | {
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| 63 | struct png_compression_buffer *next;
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| 64 | png_byte output[1]; /* actually zbuf_size */
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| 65 | } png_compression_buffer, *png_compression_bufferp;
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| 66 |
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| 67 | #define PNG_COMPRESSION_BUFFER_SIZE(pp)\
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| 68 | (offsetof(png_compression_buffer, output) + (pp)->zbuffer_size)
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| 69 | #endif
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| 70 |
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| 71 | /* Colorspace support; structures used in png_struct, png_info and in internal
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| 72 | * functions to hold and communicate information about the color space.
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| 73 | *
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| 74 | * PNG_COLORSPACE_SUPPORTED is only required if the application will perform
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| 75 | * colorspace corrections, otherwise all the colorspace information can be
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| 76 | * skipped and the size of libpng can be reduced (significantly) by compiling
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| 77 | * out the colorspace support.
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| 78 | */
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| 79 | #ifdef PNG_COLORSPACE_SUPPORTED
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| 80 | /* The chromaticities of the red, green and blue colorants and the chromaticity
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| 81 | * of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)).
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| 82 | */
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| 83 | typedef struct png_xy
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| 84 | {
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| 85 | png_fixed_point redx, redy;
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| 86 | png_fixed_point greenx, greeny;
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| 87 | png_fixed_point bluex, bluey;
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| 88 | png_fixed_point whitex, whitey;
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| 89 | } png_xy;
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| 90 |
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| 91 | /* The same data as above but encoded as CIE XYZ values. When this data comes
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| 92 | * from chromaticities the sum of the Y values is assumed to be 1.0
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| 93 | */
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| 94 | typedef struct png_XYZ
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| 95 | {
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| 96 | png_fixed_point red_X, red_Y, red_Z;
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| 97 | png_fixed_point green_X, green_Y, green_Z;
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| 98 | png_fixed_point blue_X, blue_Y, blue_Z;
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| 99 | } png_XYZ;
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| 100 | #endif /* COLORSPACE */
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| 101 |
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| 102 | #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
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| 103 | /* A colorspace is all the above plus, potentially, profile information;
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| 104 | * however at present libpng does not use the profile internally so it is only
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| 105 | * stored in the png_info struct (if iCCP is supported.) The rendering intent
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| 106 | * is retained here and is checked.
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| 107 | *
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| 108 | * The file gamma encoding information is also stored here and gamma correction
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| 109 | * is done by libpng, whereas color correction must currently be done by the
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| 110 | * application.
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| 111 | */
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| 112 | typedef struct png_colorspace
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| 113 | {
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| 114 | #ifdef PNG_GAMMA_SUPPORTED
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| 115 | png_fixed_point gamma; /* File gamma */
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| 116 | #endif
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| 117 |
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| 118 | #ifdef PNG_COLORSPACE_SUPPORTED
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| 119 | png_xy end_points_xy; /* End points as chromaticities */
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| 120 | png_XYZ end_points_XYZ; /* End points as CIE XYZ colorant values */
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| 121 | png_uint_16 rendering_intent; /* Rendering intent of a profile */
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| 122 | #endif
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| 123 |
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| 124 | /* Flags are always defined to simplify the code. */
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| 125 | png_uint_16 flags; /* As defined below */
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| 126 | } png_colorspace, * PNG_RESTRICT png_colorspacerp;
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| 127 |
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| 128 | typedef const png_colorspace * PNG_RESTRICT png_const_colorspacerp;
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| 129 |
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| 130 | /* General flags for the 'flags' field */
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| 131 | #define PNG_COLORSPACE_HAVE_GAMMA 0x0001
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| 132 | #define PNG_COLORSPACE_HAVE_ENDPOINTS 0x0002
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| 133 | #define PNG_COLORSPACE_HAVE_INTENT 0x0004
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| 134 | #define PNG_COLORSPACE_FROM_gAMA 0x0008
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| 135 | #define PNG_COLORSPACE_FROM_cHRM 0x0010
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| 136 | #define PNG_COLORSPACE_FROM_sRGB 0x0020
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| 137 | #define PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB 0x0040
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| 138 | #define PNG_COLORSPACE_MATCHES_sRGB 0x0080 /* exact match on profile */
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| 139 | #define PNG_COLORSPACE_INVALID 0x8000
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| 140 | #define PNG_COLORSPACE_CANCEL(flags) (0xffff ^ (flags))
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| 141 | #endif /* COLORSPACE || GAMMA */
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| 142 |
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| 143 | struct png_struct_def
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| 144 | {
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| 145 | #ifdef PNG_SETJMP_SUPPORTED
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| 146 | jmp_buf jmp_buf_local; /* New name in 1.6.0 for jmp_buf in png_struct */
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| 147 | png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */
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| 148 | jmp_buf *jmp_buf_ptr; /* passed to longjmp_fn */
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| 149 | size_t jmp_buf_size; /* size of the above, if allocated */
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| 150 | #endif
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| 151 | png_error_ptr error_fn; /* function for printing errors and aborting */
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| 152 | #ifdef PNG_WARNINGS_SUPPORTED
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| 153 | png_error_ptr warning_fn; /* function for printing warnings */
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| 154 | #endif
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| 155 | png_voidp error_ptr; /* user supplied struct for error functions */
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| 156 | png_rw_ptr write_data_fn; /* function for writing output data */
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| 157 | png_rw_ptr read_data_fn; /* function for reading input data */
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| 158 | png_voidp io_ptr; /* ptr to application struct for I/O functions */
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| 159 |
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| 160 | #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
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| 161 | png_user_transform_ptr read_user_transform_fn; /* user read transform */
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| 162 | #endif
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| 163 |
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| 164 | #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
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| 165 | png_user_transform_ptr write_user_transform_fn; /* user write transform */
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| 166 | #endif
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| 167 |
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| 168 | /* These were added in libpng-1.0.2 */
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| 169 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
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| 170 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
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| 171 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
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| 172 | png_voidp user_transform_ptr; /* user supplied struct for user transform */
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| 173 | png_byte user_transform_depth; /* bit depth of user transformed pixels */
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| 174 | png_byte user_transform_channels; /* channels in user transformed pixels */
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| 175 | #endif
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| 176 | #endif
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| 177 |
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| 178 | png_uint_32 mode; /* tells us where we are in the PNG file */
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| 179 | png_uint_32 flags; /* flags indicating various things to libpng */
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| 180 | png_uint_32 transformations; /* which transformations to perform */
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| 181 |
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| 182 | png_uint_32 zowner; /* ID (chunk type) of zstream owner, 0 if none */
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| 183 | z_stream zstream; /* decompression structure */
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| 184 |
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| 185 | #ifdef PNG_WRITE_SUPPORTED
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| 186 | png_compression_bufferp zbuffer_list; /* Created on demand during write */
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| 187 | uInt zbuffer_size; /* size of the actual buffer */
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| 188 |
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| 189 | int zlib_level; /* holds zlib compression level */
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| 190 | int zlib_method; /* holds zlib compression method */
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| 191 | int zlib_window_bits; /* holds zlib compression window bits */
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| 192 | int zlib_mem_level; /* holds zlib compression memory level */
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| 193 | int zlib_strategy; /* holds zlib compression strategy */
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| 194 | #endif
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| 195 | /* Added at libpng 1.5.4 */
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| 196 | #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
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| 197 | int zlib_text_level; /* holds zlib compression level */
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| 198 | int zlib_text_method; /* holds zlib compression method */
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| 199 | int zlib_text_window_bits; /* holds zlib compression window bits */
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| 200 | int zlib_text_mem_level; /* holds zlib compression memory level */
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| 201 | int zlib_text_strategy; /* holds zlib compression strategy */
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| 202 | #endif
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| 203 | /* End of material added at libpng 1.5.4 */
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| 204 | /* Added at libpng 1.6.0 */
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| 205 | #ifdef PNG_WRITE_SUPPORTED
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| 206 | int zlib_set_level; /* Actual values set into the zstream on write */
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| 207 | int zlib_set_method;
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| 208 | int zlib_set_window_bits;
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| 209 | int zlib_set_mem_level;
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| 210 | int zlib_set_strategy;
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| 211 | #endif
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| 212 |
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| 213 | png_uint_32 width; /* width of image in pixels */
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| 214 | png_uint_32 height; /* height of image in pixels */
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| 215 | png_uint_32 num_rows; /* number of rows in current pass */
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| 216 | png_uint_32 usr_width; /* width of row at start of write */
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| 217 | size_t rowbytes; /* size of row in bytes */
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| 218 | png_uint_32 iwidth; /* width of current interlaced row in pixels */
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| 219 | png_uint_32 row_number; /* current row in interlace pass */
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| 220 | png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */
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| 221 | png_bytep prev_row; /* buffer to save previous (unfiltered) row.
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| 222 | * While reading this is a pointer into
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| 223 | * big_prev_row; while writing it is separately
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| 224 | * allocated if needed.
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| 225 | */
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| 226 | png_bytep row_buf; /* buffer to save current (unfiltered) row.
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| 227 | * While reading, this is a pointer into
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| 228 | * big_row_buf; while writing it is separately
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| 229 | * allocated.
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| 230 | */
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| 231 | #ifdef PNG_WRITE_FILTER_SUPPORTED
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| 232 | png_bytep try_row; /* buffer to save trial row when filtering */
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| 233 | png_bytep tst_row; /* buffer to save best trial row when filtering */
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| 234 | #endif
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| 235 | size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */
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| 236 |
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| 237 | png_uint_32 idat_size; /* current IDAT size for read */
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| 238 | png_uint_32 crc; /* current chunk CRC value */
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| 239 | png_colorp palette; /* palette from the input file */
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| 240 | png_uint_16 num_palette; /* number of color entries in palette */
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| 241 |
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| 242 | /* Added at libpng-1.5.10 */
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| 243 | #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
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| 244 | int num_palette_max; /* maximum palette index found in IDAT */
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| 245 | #endif
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| 246 |
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| 247 | png_uint_16 num_trans; /* number of transparency values */
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| 248 | png_byte compression; /* file compression type (always 0) */
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| 249 | png_byte filter; /* file filter type (always 0) */
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| 250 | png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
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| 251 | png_byte pass; /* current interlace pass (0 - 6) */
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| 252 | png_byte do_filter; /* row filter flags (see PNG_FILTER_ in png.h ) */
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| 253 | png_byte color_type; /* color type of file */
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| 254 | png_byte bit_depth; /* bit depth of file */
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| 255 | png_byte usr_bit_depth; /* bit depth of users row: write only */
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| 256 | png_byte pixel_depth; /* number of bits per pixel */
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| 257 | png_byte channels; /* number of channels in file */
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| 258 | #ifdef PNG_WRITE_SUPPORTED
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| 259 | png_byte usr_channels; /* channels at start of write: write only */
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| 260 | #endif
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| 261 | png_byte sig_bytes; /* magic bytes read/written from start of file */
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| 262 | png_byte maximum_pixel_depth;
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| 263 | /* pixel depth used for the row buffers */
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| 264 | png_byte transformed_pixel_depth;
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| 265 | /* pixel depth after read/write transforms */
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| 266 | #if ZLIB_VERNUM >= 0x1240
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| 267 | png_byte zstream_start; /* at start of an input zlib stream */
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| 268 | #endif /* Zlib >= 1.2.4 */
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| 269 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
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| 270 | png_uint_16 filler; /* filler bytes for pixel expansion */
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| 271 | #endif
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| 272 |
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| 273 | #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
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| 274 | defined(PNG_READ_ALPHA_MODE_SUPPORTED)
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| 275 | png_byte background_gamma_type;
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| 276 | png_fixed_point background_gamma;
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| 277 | png_color_16 background; /* background color in screen gamma space */
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| 278 | #ifdef PNG_READ_GAMMA_SUPPORTED
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| 279 | png_color_16 background_1; /* background normalized to gamma 1.0 */
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| 280 | #endif
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| 281 | #endif /* bKGD */
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| 282 |
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| 283 | #ifdef PNG_WRITE_FLUSH_SUPPORTED
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| 284 | png_flush_ptr output_flush_fn; /* Function for flushing output */
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| 285 | png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
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| 286 | png_uint_32 flush_rows; /* number of rows written since last flush */
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| 287 | #endif
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| 288 |
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| 289 | #ifdef PNG_READ_GAMMA_SUPPORTED
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| 290 | int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */
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| 291 | png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */
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| 292 |
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| 293 | png_bytep gamma_table; /* gamma table for 8-bit depth files */
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| 294 | png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
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| 295 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
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| 296 | defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
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| 297 | defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
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| 298 | png_bytep gamma_from_1; /* converts from 1.0 to screen */
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| 299 | png_bytep gamma_to_1; /* converts from file to 1.0 */
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| 300 | png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
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| 301 | png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
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| 302 | #endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
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| 303 | #endif
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| 304 |
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| 305 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
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| 306 | png_color_8 sig_bit; /* significant bits in each available channel */
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| 307 | #endif
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| 308 |
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| 309 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
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| 310 | png_color_8 shift; /* shift for significant bit transformation */
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| 311 | #endif
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| 312 |
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| 313 | #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
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| 314 | || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
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| 315 | png_bytep trans_alpha; /* alpha values for paletted files */
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| 316 | png_color_16 trans_color; /* transparent color for non-paletted files */
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| 317 | #endif
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| 318 |
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| 319 | png_read_status_ptr read_row_fn; /* called after each row is decoded */
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| 320 | png_write_status_ptr write_row_fn; /* called after each row is encoded */
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| 321 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
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| 322 | png_progressive_info_ptr info_fn; /* called after header data fully read */
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| 323 | png_progressive_row_ptr row_fn; /* called after a prog. row is decoded */
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| 324 | png_progressive_end_ptr end_fn; /* called after image is complete */
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| 325 | png_bytep save_buffer_ptr; /* current location in save_buffer */
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| 326 | png_bytep save_buffer; /* buffer for previously read data */
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| 327 | png_bytep current_buffer_ptr; /* current location in current_buffer */
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| 328 | png_bytep current_buffer; /* buffer for recently used data */
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| 329 | png_uint_32 push_length; /* size of current input chunk */
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| 330 | png_uint_32 skip_length; /* bytes to skip in input data */
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| 331 | size_t save_buffer_size; /* amount of data now in save_buffer */
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| 332 | size_t save_buffer_max; /* total size of save_buffer */
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| 333 | size_t buffer_size; /* total amount of available input data */
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| 334 | size_t current_buffer_size; /* amount of data now in current_buffer */
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| 335 | int process_mode; /* what push library is currently doing */
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| 336 | int cur_palette; /* current push library palette index */
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| 337 |
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| 338 | #endif /* PROGRESSIVE_READ */
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| 339 |
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| 340 | #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
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| 341 | /* For the Borland special 64K segment handler */
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| 342 | png_bytepp offset_table_ptr;
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| 343 | png_bytep offset_table;
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| 344 | png_uint_16 offset_table_number;
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| 345 | png_uint_16 offset_table_count;
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| 346 | png_uint_16 offset_table_count_free;
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| 347 | #endif
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| 348 |
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| 349 | #ifdef PNG_READ_QUANTIZE_SUPPORTED
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| 350 | png_bytep palette_lookup; /* lookup table for quantizing */
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| 351 | png_bytep quantize_index; /* index translation for palette files */
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| 352 | #endif
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| 353 |
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| 354 | /* Options */
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| 355 | #ifdef PNG_SET_OPTION_SUPPORTED
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| 356 | png_uint_32 options; /* On/off state (up to 16 options) */
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| 357 | #endif
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| 358 |
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| 359 | #if PNG_LIBPNG_VER < 10700
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| 360 | /* To do: remove this from libpng-1.7 */
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| 361 | #ifdef PNG_TIME_RFC1123_SUPPORTED
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| 362 | char time_buffer[29]; /* String to hold RFC 1123 time text */
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| 363 | #endif
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| 364 | #endif
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| 365 |
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| 366 | /* New members added in libpng-1.0.6 */
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| 367 |
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| 368 | png_uint_32 free_me; /* flags items libpng is responsible for freeing */
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| 369 |
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| 370 | #ifdef PNG_USER_CHUNKS_SUPPORTED
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| 371 | png_voidp user_chunk_ptr;
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| 372 | #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
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| 373 | png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
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| 374 | #endif
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| 375 | #endif
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| 376 |
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| 377 | #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
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| 378 | int unknown_default; /* As PNG_HANDLE_* */
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| 379 | unsigned int num_chunk_list; /* Number of entries in the list */
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| 380 | png_bytep chunk_list; /* List of png_byte[5]; the textual chunk name
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| 381 | * followed by a PNG_HANDLE_* byte */
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| 382 | #endif
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| 383 |
|
|---|
| 384 | /* New members added in libpng-1.0.3 */
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| 385 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
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| 386 | png_byte rgb_to_gray_status;
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|---|
| 387 | /* Added in libpng 1.5.5 to record setting of coefficients: */
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|---|
| 388 | png_byte rgb_to_gray_coefficients_set;
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|---|
| 389 | /* These were changed from png_byte in libpng-1.0.6 */
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|---|
| 390 | png_uint_16 rgb_to_gray_red_coeff;
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| 391 | png_uint_16 rgb_to_gray_green_coeff;
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| 392 | /* deleted in 1.5.5: rgb_to_gray_blue_coeff; */
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|---|
| 393 | #endif
|
|---|
| 394 |
|
|---|
| 395 | /* New member added in libpng-1.6.36 */
|
|---|
| 396 | #if defined(PNG_READ_EXPAND_SUPPORTED) && \
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|---|
| 397 | defined(PNG_ARM_NEON_IMPLEMENTATION)
|
|---|
| 398 | png_bytep riffled_palette; /* buffer for accelerated palette expansion */
|
|---|
| 399 | #endif
|
|---|
| 400 |
|
|---|
| 401 | /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
|
|---|
| 402 | #if defined(PNG_MNG_FEATURES_SUPPORTED)
|
|---|
| 403 | /* Changed from png_byte to png_uint_32 at version 1.2.0 */
|
|---|
| 404 | png_uint_32 mng_features_permitted;
|
|---|
| 405 | #endif
|
|---|
| 406 |
|
|---|
| 407 | /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
|
|---|
| 408 | #ifdef PNG_MNG_FEATURES_SUPPORTED
|
|---|
| 409 | png_byte filter_type;
|
|---|
| 410 | #endif
|
|---|
| 411 |
|
|---|
| 412 | /* New members added in libpng-1.2.0 */
|
|---|
| 413 |
|
|---|
| 414 | /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
|
|---|
| 415 | #ifdef PNG_USER_MEM_SUPPORTED
|
|---|
| 416 | png_voidp mem_ptr; /* user supplied struct for mem functions */
|
|---|
| 417 | png_malloc_ptr malloc_fn; /* function for allocating memory */
|
|---|
| 418 | png_free_ptr free_fn; /* function for freeing memory */
|
|---|
| 419 | #endif
|
|---|
| 420 |
|
|---|
| 421 | /* New member added in libpng-1.0.13 and 1.2.0 */
|
|---|
| 422 | png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
|
|---|
| 423 |
|
|---|
| 424 | #ifdef PNG_READ_QUANTIZE_SUPPORTED
|
|---|
| 425 | /* The following three members were added at version 1.0.14 and 1.2.4 */
|
|---|
| 426 | png_bytep quantize_sort; /* working sort array */
|
|---|
| 427 | png_bytep index_to_palette; /* where the original index currently is
|
|---|
| 428 | in the palette */
|
|---|
| 429 | png_bytep palette_to_index; /* which original index points to this
|
|---|
| 430 | palette color */
|
|---|
| 431 | #endif
|
|---|
| 432 |
|
|---|
| 433 | /* New members added in libpng-1.0.16 and 1.2.6 */
|
|---|
| 434 | png_byte compression_type;
|
|---|
| 435 |
|
|---|
| 436 | #ifdef PNG_USER_LIMITS_SUPPORTED
|
|---|
| 437 | png_uint_32 user_width_max;
|
|---|
| 438 | png_uint_32 user_height_max;
|
|---|
| 439 |
|
|---|
| 440 | /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
|
|---|
| 441 | * chunks that can be stored (0 means unlimited).
|
|---|
| 442 | */
|
|---|
| 443 | png_uint_32 user_chunk_cache_max;
|
|---|
| 444 |
|
|---|
| 445 | /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk
|
|---|
| 446 | * can occupy when decompressed. 0 means unlimited.
|
|---|
| 447 | */
|
|---|
| 448 | png_alloc_size_t user_chunk_malloc_max;
|
|---|
| 449 | #endif
|
|---|
| 450 |
|
|---|
| 451 | /* New member added in libpng-1.0.25 and 1.2.17 */
|
|---|
| 452 | #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
|
|---|
| 453 | /* Temporary storage for unknown chunk that the library doesn't recognize,
|
|---|
| 454 | * used while reading the chunk.
|
|---|
| 455 | */
|
|---|
| 456 | png_unknown_chunk unknown_chunk;
|
|---|
| 457 | #endif
|
|---|
| 458 |
|
|---|
| 459 | /* New member added in libpng-1.2.26 */
|
|---|
| 460 | size_t old_big_row_buf_size;
|
|---|
| 461 |
|
|---|
| 462 | #ifdef PNG_READ_SUPPORTED
|
|---|
| 463 | /* New member added in libpng-1.2.30 */
|
|---|
| 464 | png_bytep read_buffer; /* buffer for reading chunk data */
|
|---|
| 465 | png_alloc_size_t read_buffer_size; /* current size of the buffer */
|
|---|
| 466 | #endif
|
|---|
| 467 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|---|
| 468 | uInt IDAT_read_size; /* limit on read buffer size for IDAT */
|
|---|
| 469 | #endif
|
|---|
| 470 |
|
|---|
| 471 | #ifdef PNG_IO_STATE_SUPPORTED
|
|---|
| 472 | /* New member added in libpng-1.4.0 */
|
|---|
| 473 | png_uint_32 io_state;
|
|---|
| 474 | #endif
|
|---|
| 475 |
|
|---|
| 476 | /* New member added in libpng-1.5.6 */
|
|---|
| 477 | png_bytep big_prev_row;
|
|---|
| 478 |
|
|---|
| 479 | /* New member added in libpng-1.5.7 */
|
|---|
| 480 | void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info,
|
|---|
| 481 | png_bytep row, png_const_bytep prev_row);
|
|---|
| 482 |
|
|---|
| 483 | #ifdef PNG_READ_SUPPORTED
|
|---|
| 484 | #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
|
|---|
| 485 | png_colorspace colorspace;
|
|---|
| 486 | #endif
|
|---|
| 487 | #endif
|
|---|
| 488 | };
|
|---|
| 489 | #endif /* PNGSTRUCT_H */
|
|---|
