| 1 | /* pngstruct.h - header file for PNG reference library
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| 2 | *
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| 3 | * Copyright (c) 2018-2022 Cosmin Truta
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| 4 | * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
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| 5 | * Copyright (c) 1996-1997 Andreas Dilger
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| 6 | * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
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| 7 | *
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| 8 | * This code is released under the libpng license.
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| 9 | * For conditions of distribution and use, see the disclaimer
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| 10 | * and license in png.h
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| 11 | */
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| 12 |
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| 13 | /* The structure that holds the information to read and write PNG files.
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| 14 | * The only people who need to care about what is inside of this are the
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| 15 | * people who will be modifying the library for their own special needs.
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| 16 | * It should NOT be accessed directly by an application.
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| 17 | */
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| 18 |
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| 19 | #ifndef PNGSTRUCT_H
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| 20 | #define PNGSTRUCT_H
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| 21 | /* zlib.h defines the structure z_stream, an instance of which is included
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| 22 | * in this structure and is required for decompressing the LZ compressed
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| 23 | * data in PNG files.
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| 24 | */
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| 25 | #ifndef ZLIB_CONST
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| 26 | /* We must ensure that zlib uses 'const' in declarations. */
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| 27 | # define ZLIB_CONST
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| 28 | #endif
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| 29 | #include "zlib.h"
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| 30 | #ifdef const
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| 31 | /* zlib.h sometimes #defines const to nothing, undo this. */
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| 32 | # undef const
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| 33 | #endif
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| 34 |
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| 35 | /* zlib.h has mediocre z_const use before 1.2.6, this stuff is for compatibility
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| 36 | * with older builds.
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| 37 | */
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| 38 | #if ZLIB_VERNUM < 0x1260
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| 39 | # define PNGZ_MSG_CAST(s) png_constcast(char*,s)
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| 40 | # define PNGZ_INPUT_CAST(b) png_constcast(png_bytep,b)
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| 41 | #else
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| 42 | # define PNGZ_MSG_CAST(s) (s)
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| 43 | # define PNGZ_INPUT_CAST(b) (b)
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| 44 | #endif
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| 45 |
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| 46 | /* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib
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| 47 | * can handle at once. This type need be no larger than 16 bits (so maximum of
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| 48 | * 65535), this define allows us to discover how big it is, but limited by the
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| 49 | * maximum for size_t. The value can be overridden in a library build
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| 50 | * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably
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| 51 | * lower value (e.g. 255 works). A lower value may help memory usage (slightly)
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| 52 | * and may even improve performance on some systems (and degrade it on others.)
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| 53 | */
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| 54 | #ifndef ZLIB_IO_MAX
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| 55 | # define ZLIB_IO_MAX ((uInt)-1)
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| 56 | #endif
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| 57 |
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| 58 | #ifdef PNG_WRITE_SUPPORTED
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| 59 | /* The type of a compression buffer list used by the write code. */
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| 60 | typedef struct png_compression_buffer
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| 61 | {
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| 62 | struct png_compression_buffer *next;
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| 63 | png_byte output[1]; /* actually zbuf_size */
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| 64 | } png_compression_buffer, *png_compression_bufferp;
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| 65 |
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| 66 | #define PNG_COMPRESSION_BUFFER_SIZE(pp)\
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| 67 | (offsetof(png_compression_buffer, output) + (pp)->zbuffer_size)
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| 68 | #endif
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| 69 |
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| 70 | /* Colorspace support; structures used in png_struct, png_info and in internal
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| 71 | * functions to hold and communicate information about the color space.
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| 72 | *
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| 73 | * PNG_COLORSPACE_SUPPORTED is only required if the application will perform
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| 74 | * colorspace corrections, otherwise all the colorspace information can be
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| 75 | * skipped and the size of libpng can be reduced (significantly) by compiling
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| 76 | * out the colorspace support.
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| 77 | */
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| 78 | #ifdef PNG_COLORSPACE_SUPPORTED
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| 79 | /* The chromaticities of the red, green and blue colorants and the chromaticity
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| 80 | * of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)).
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| 81 | */
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| 82 | typedef struct png_xy
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| 83 | {
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| 84 | png_fixed_point redx, redy;
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| 85 | png_fixed_point greenx, greeny;
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| 86 | png_fixed_point bluex, bluey;
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| 87 | png_fixed_point whitex, whitey;
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| 88 | } png_xy;
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| 89 |
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| 90 | /* The same data as above but encoded as CIE XYZ values. When this data comes
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| 91 | * from chromaticities the sum of the Y values is assumed to be 1.0
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| 92 | */
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| 93 | typedef struct png_XYZ
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| 94 | {
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| 95 | png_fixed_point red_X, red_Y, red_Z;
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| 96 | png_fixed_point green_X, green_Y, green_Z;
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| 97 | png_fixed_point blue_X, blue_Y, blue_Z;
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| 98 | } png_XYZ;
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| 99 | #endif /* COLORSPACE */
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| 100 |
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| 101 | #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
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| 102 | /* A colorspace is all the above plus, potentially, profile information;
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| 103 | * however at present libpng does not use the profile internally so it is only
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| 104 | * stored in the png_info struct (if iCCP is supported.) The rendering intent
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| 105 | * is retained here and is checked.
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| 106 | *
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| 107 | * The file gamma encoding information is also stored here and gamma correction
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| 108 | * is done by libpng, whereas color correction must currently be done by the
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| 109 | * application.
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| 110 | */
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| 111 | typedef struct png_colorspace
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| 112 | {
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| 113 | #ifdef PNG_GAMMA_SUPPORTED
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| 114 | png_fixed_point gamma; /* File gamma */
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| 115 | #endif
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| 116 |
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| 117 | #ifdef PNG_COLORSPACE_SUPPORTED
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| 118 | png_xy end_points_xy; /* End points as chromaticities */
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| 119 | png_XYZ end_points_XYZ; /* End points as CIE XYZ colorant values */
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| 120 | png_uint_16 rendering_intent; /* Rendering intent of a profile */
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| 121 | #endif
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| 122 |
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| 123 | /* Flags are always defined to simplify the code. */
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| 124 | png_uint_16 flags; /* As defined below */
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| 125 | } png_colorspace, * PNG_RESTRICT png_colorspacerp;
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| 126 |
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| 127 | typedef const png_colorspace * PNG_RESTRICT png_const_colorspacerp;
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| 128 |
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| 129 | /* General flags for the 'flags' field */
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| 130 | #define PNG_COLORSPACE_HAVE_GAMMA 0x0001
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| 131 | #define PNG_COLORSPACE_HAVE_ENDPOINTS 0x0002
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| 132 | #define PNG_COLORSPACE_HAVE_INTENT 0x0004
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| 133 | #define PNG_COLORSPACE_FROM_gAMA 0x0008
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| 134 | #define PNG_COLORSPACE_FROM_cHRM 0x0010
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| 135 | #define PNG_COLORSPACE_FROM_sRGB 0x0020
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| 136 | #define PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB 0x0040
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| 137 | #define PNG_COLORSPACE_MATCHES_sRGB 0x0080 /* exact match on profile */
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| 138 | #define PNG_COLORSPACE_INVALID 0x8000
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| 139 | #define PNG_COLORSPACE_CANCEL(flags) (0xffff ^ (flags))
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| 140 | #endif /* COLORSPACE || GAMMA */
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| 141 |
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| 142 | struct png_struct_def
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| 143 | {
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| 144 | #ifdef PNG_SETJMP_SUPPORTED
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| 145 | jmp_buf jmp_buf_local; /* New name in 1.6.0 for jmp_buf in png_struct */
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| 146 | png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */
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| 147 | jmp_buf *jmp_buf_ptr; /* passed to longjmp_fn */
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| 148 | size_t jmp_buf_size; /* size of the above, if allocated */
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| 149 | #endif
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| 150 | png_error_ptr error_fn; /* function for printing errors and aborting */
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| 151 | #ifdef PNG_WARNINGS_SUPPORTED
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| 152 | png_error_ptr warning_fn; /* function for printing warnings */
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| 153 | #endif
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| 154 | png_voidp error_ptr; /* user supplied struct for error functions */
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| 155 | png_rw_ptr write_data_fn; /* function for writing output data */
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| 156 | png_rw_ptr read_data_fn; /* function for reading input data */
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| 157 | png_voidp io_ptr; /* ptr to application struct for I/O functions */
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| 158 |
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| 159 | #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
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| 160 | png_user_transform_ptr read_user_transform_fn; /* user read transform */
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| 161 | #endif
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| 162 |
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| 163 | #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
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| 164 | png_user_transform_ptr write_user_transform_fn; /* user write transform */
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| 165 | #endif
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| 166 |
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| 167 | /* These were added in libpng-1.0.2 */
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| 168 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
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| 169 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
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| 170 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
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| 171 | png_voidp user_transform_ptr; /* user supplied struct for user transform */
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| 172 | png_byte user_transform_depth; /* bit depth of user transformed pixels */
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| 173 | png_byte user_transform_channels; /* channels in user transformed pixels */
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| 174 | #endif
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| 175 | #endif
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| 176 |
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| 177 | png_uint_32 mode; /* tells us where we are in the PNG file */
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| 178 | png_uint_32 flags; /* flags indicating various things to libpng */
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| 179 | png_uint_32 transformations; /* which transformations to perform */
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| 180 |
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| 181 | png_uint_32 zowner; /* ID (chunk type) of zstream owner, 0 if none */
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| 182 | z_stream zstream; /* decompression structure */
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| 183 |
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| 184 | #ifdef PNG_WRITE_SUPPORTED
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| 185 | png_compression_bufferp zbuffer_list; /* Created on demand during write */
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| 186 | uInt zbuffer_size; /* size of the actual buffer */
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| 187 |
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| 188 | int zlib_level; /* holds zlib compression level */
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| 189 | int zlib_method; /* holds zlib compression method */
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| 190 | int zlib_window_bits; /* holds zlib compression window bits */
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| 191 | int zlib_mem_level; /* holds zlib compression memory level */
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| 192 | int zlib_strategy; /* holds zlib compression strategy */
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| 193 | #endif
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| 194 | /* Added at libpng 1.5.4 */
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| 195 | #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
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| 196 | int zlib_text_level; /* holds zlib compression level */
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| 197 | int zlib_text_method; /* holds zlib compression method */
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| 198 | int zlib_text_window_bits; /* holds zlib compression window bits */
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| 199 | int zlib_text_mem_level; /* holds zlib compression memory level */
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| 200 | int zlib_text_strategy; /* holds zlib compression strategy */
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| 201 | #endif
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| 202 | /* End of material added at libpng 1.5.4 */
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| 203 | /* Added at libpng 1.6.0 */
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| 204 | #ifdef PNG_WRITE_SUPPORTED
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| 205 | int zlib_set_level; /* Actual values set into the zstream on write */
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| 206 | int zlib_set_method;
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| 207 | int zlib_set_window_bits;
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| 208 | int zlib_set_mem_level;
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| 209 | int zlib_set_strategy;
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| 210 | #endif
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| 211 |
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| 212 | png_uint_32 width; /* width of image in pixels */
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| 213 | png_uint_32 height; /* height of image in pixels */
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| 214 | png_uint_32 num_rows; /* number of rows in current pass */
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| 215 | png_uint_32 usr_width; /* width of row at start of write */
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| 216 | size_t rowbytes; /* size of row in bytes */
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| 217 | png_uint_32 iwidth; /* width of current interlaced row in pixels */
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| 218 | png_uint_32 row_number; /* current row in interlace pass */
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| 219 | png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */
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| 220 | png_bytep prev_row; /* buffer to save previous (unfiltered) row.
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| 221 | * While reading this is a pointer into
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| 222 | * big_prev_row; while writing it is separately
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| 223 | * allocated if needed.
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| 224 | */
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| 225 | png_bytep row_buf; /* buffer to save current (unfiltered) row.
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| 226 | * While reading, this is a pointer into
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| 227 | * big_row_buf; while writing it is separately
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| 228 | * allocated.
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| 229 | */
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| 230 | #ifdef PNG_WRITE_FILTER_SUPPORTED
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| 231 | png_bytep try_row; /* buffer to save trial row when filtering */
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| 232 | png_bytep tst_row; /* buffer to save best trial row when filtering */
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| 233 | #endif
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| 234 | size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */
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| 235 |
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| 236 | png_uint_32 idat_size; /* current IDAT size for read */
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| 237 | png_uint_32 crc; /* current chunk CRC value */
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| 238 | png_colorp palette; /* palette from the input file */
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| 239 | png_uint_16 num_palette; /* number of color entries in palette */
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| 240 |
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| 241 | /* Added at libpng-1.5.10 */
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| 242 | #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
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| 243 | int num_palette_max; /* maximum palette index found in IDAT */
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| 244 | #endif
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| 245 |
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| 246 | png_uint_16 num_trans; /* number of transparency values */
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| 247 | png_byte compression; /* file compression type (always 0) */
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| 248 | png_byte filter; /* file filter type (always 0) */
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| 249 | png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
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| 250 | png_byte pass; /* current interlace pass (0 - 6) */
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| 251 | png_byte do_filter; /* row filter flags (see PNG_FILTER_ in png.h ) */
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| 252 | png_byte color_type; /* color type of file */
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| 253 | png_byte bit_depth; /* bit depth of file */
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| 254 | png_byte usr_bit_depth; /* bit depth of users row: write only */
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| 255 | png_byte pixel_depth; /* number of bits per pixel */
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| 256 | png_byte channels; /* number of channels in file */
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| 257 | #ifdef PNG_WRITE_SUPPORTED
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| 258 | png_byte usr_channels; /* channels at start of write: write only */
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| 259 | #endif
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| 260 | png_byte sig_bytes; /* magic bytes read/written from start of file */
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| 261 | png_byte maximum_pixel_depth;
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| 262 | /* pixel depth used for the row buffers */
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| 263 | png_byte transformed_pixel_depth;
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| 264 | /* pixel depth after read/write transforms */
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| 265 | #if ZLIB_VERNUM >= 0x1240
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| 266 | png_byte zstream_start; /* at start of an input zlib stream */
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| 267 | #endif /* Zlib >= 1.2.4 */
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| 268 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
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| 269 | png_uint_16 filler; /* filler bytes for pixel expansion */
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| 270 | #endif
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| 271 |
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| 272 | #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
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| 273 | defined(PNG_READ_ALPHA_MODE_SUPPORTED)
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| 274 | png_byte background_gamma_type;
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| 275 | png_fixed_point background_gamma;
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| 276 | png_color_16 background; /* background color in screen gamma space */
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| 277 | #ifdef PNG_READ_GAMMA_SUPPORTED
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| 278 | png_color_16 background_1; /* background normalized to gamma 1.0 */
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| 279 | #endif
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| 280 | #endif /* bKGD */
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| 281 |
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| 282 | #ifdef PNG_WRITE_FLUSH_SUPPORTED
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| 283 | png_flush_ptr output_flush_fn; /* Function for flushing output */
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| 284 | png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
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| 285 | png_uint_32 flush_rows; /* number of rows written since last flush */
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| 286 | #endif
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| 287 |
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| 288 | #ifdef PNG_READ_GAMMA_SUPPORTED
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| 289 | int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */
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| 290 | png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */
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| 291 |
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| 292 | png_bytep gamma_table; /* gamma table for 8-bit depth files */
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| 293 | png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
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| 294 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
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| 295 | defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
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| 296 | defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
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| 297 | png_bytep gamma_from_1; /* converts from 1.0 to screen */
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| 298 | png_bytep gamma_to_1; /* converts from file to 1.0 */
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| 299 | png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
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| 300 | png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
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| 301 | #endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
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| 302 | #endif
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| 303 |
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| 304 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
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| 305 | png_color_8 sig_bit; /* significant bits in each available channel */
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| 306 | #endif
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| 307 |
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| 308 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
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| 309 | png_color_8 shift; /* shift for significant bit transformation */
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| 310 | #endif
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| 311 |
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| 312 | #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
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| 313 | || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
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| 314 | png_bytep trans_alpha; /* alpha values for paletted files */
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| 315 | png_color_16 trans_color; /* transparent color for non-paletted files */
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| 316 | #endif
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| 317 |
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| 318 | png_read_status_ptr read_row_fn; /* called after each row is decoded */
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| 319 | png_write_status_ptr write_row_fn; /* called after each row is encoded */
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| 320 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
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| 321 | png_progressive_info_ptr info_fn; /* called after header data fully read */
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| 322 | png_progressive_row_ptr row_fn; /* called after a prog. row is decoded */
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| 323 | png_progressive_end_ptr end_fn; /* called after image is complete */
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| 324 | png_bytep save_buffer_ptr; /* current location in save_buffer */
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| 325 | png_bytep save_buffer; /* buffer for previously read data */
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| 326 | png_bytep current_buffer_ptr; /* current location in current_buffer */
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| 327 | png_bytep current_buffer; /* buffer for recently used data */
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| 328 | png_uint_32 push_length; /* size of current input chunk */
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| 329 | png_uint_32 skip_length; /* bytes to skip in input data */
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| 330 | size_t save_buffer_size; /* amount of data now in save_buffer */
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| 331 | size_t save_buffer_max; /* total size of save_buffer */
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| 332 | size_t buffer_size; /* total amount of available input data */
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| 333 | size_t current_buffer_size; /* amount of data now in current_buffer */
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| 334 | int process_mode; /* what push library is currently doing */
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| 335 | int cur_palette; /* current push library palette index */
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| 336 | #endif /* PROGRESSIVE_READ */
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| 337 |
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| 338 | #ifdef PNG_READ_QUANTIZE_SUPPORTED
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| 339 | png_bytep palette_lookup; /* lookup table for quantizing */
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| 340 | png_bytep quantize_index; /* index translation for palette files */
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| 341 | #endif
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| 342 |
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| 343 | /* Options */
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| 344 | #ifdef PNG_SET_OPTION_SUPPORTED
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| 345 | png_uint_32 options; /* On/off state (up to 16 options) */
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| 346 | #endif
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| 347 |
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| 348 | #if PNG_LIBPNG_VER < 10700
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| 349 | /* To do: remove this from libpng-1.7 */
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| 350 | #ifdef PNG_TIME_RFC1123_SUPPORTED
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| 351 | char time_buffer[29]; /* String to hold RFC 1123 time text */
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| 352 | #endif
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| 353 | #endif
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| 354 |
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| 355 | /* New members added in libpng-1.0.6 */
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| 356 |
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| 357 | png_uint_32 free_me; /* flags items libpng is responsible for freeing */
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| 358 |
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| 359 | #ifdef PNG_USER_CHUNKS_SUPPORTED
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| 360 | png_voidp user_chunk_ptr;
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| 361 | #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
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| 362 | png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
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| 363 | #endif
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| 364 | #endif
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| 365 |
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| 366 | #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
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| 367 | int unknown_default; /* As PNG_HANDLE_* */
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| 368 | unsigned int num_chunk_list; /* Number of entries in the list */
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| 369 | png_bytep chunk_list; /* List of png_byte[5]; the textual chunk name
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| 370 | * followed by a PNG_HANDLE_* byte */
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| 371 | #endif
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| 372 |
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| 373 | /* New members added in libpng-1.0.3 */
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| 374 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
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| 375 | png_byte rgb_to_gray_status;
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| 376 | /* Added in libpng 1.5.5 to record setting of coefficients: */
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| 377 | png_byte rgb_to_gray_coefficients_set;
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| 378 | /* These were changed from png_byte in libpng-1.0.6 */
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| 379 | png_uint_16 rgb_to_gray_red_coeff;
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| 380 | png_uint_16 rgb_to_gray_green_coeff;
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| 381 | /* deleted in 1.5.5: rgb_to_gray_blue_coeff; */
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| 382 | #endif
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| 383 |
|
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| 384 | /* New member added in libpng-1.6.36 */
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| 385 | #if defined(PNG_READ_EXPAND_SUPPORTED) && \
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| 386 | defined(PNG_ARM_NEON_IMPLEMENTATION)
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| 387 | png_bytep riffled_palette; /* buffer for accelerated palette expansion */
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| 388 | #endif
|
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| 389 |
|
|---|
| 390 | /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
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|---|
| 391 | #if defined(PNG_MNG_FEATURES_SUPPORTED)
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| 392 | /* Changed from png_byte to png_uint_32 at version 1.2.0 */
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| 393 | png_uint_32 mng_features_permitted;
|
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| 394 | #endif
|
|---|
| 395 |
|
|---|
| 396 | /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
|
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| 397 | #ifdef PNG_MNG_FEATURES_SUPPORTED
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| 398 | png_byte filter_type;
|
|---|
| 399 | #endif
|
|---|
| 400 |
|
|---|
| 401 | /* New members added in libpng-1.2.0 */
|
|---|
| 402 |
|
|---|
| 403 | /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
|
|---|
| 404 | #ifdef PNG_USER_MEM_SUPPORTED
|
|---|
| 405 | png_voidp mem_ptr; /* user supplied struct for mem functions */
|
|---|
| 406 | png_malloc_ptr malloc_fn; /* function for allocating memory */
|
|---|
| 407 | png_free_ptr free_fn; /* function for freeing memory */
|
|---|
| 408 | #endif
|
|---|
| 409 |
|
|---|
| 410 | /* New member added in libpng-1.0.13 and 1.2.0 */
|
|---|
| 411 | png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
|
|---|
| 412 |
|
|---|
| 413 | #ifdef PNG_READ_QUANTIZE_SUPPORTED
|
|---|
| 414 | /* The following three members were added at version 1.0.14 and 1.2.4 */
|
|---|
| 415 | png_bytep quantize_sort; /* working sort array */
|
|---|
| 416 | png_bytep index_to_palette; /* where the original index currently is
|
|---|
| 417 | in the palette */
|
|---|
| 418 | png_bytep palette_to_index; /* which original index points to this
|
|---|
| 419 | palette color */
|
|---|
| 420 | #endif
|
|---|
| 421 |
|
|---|
| 422 | /* New members added in libpng-1.0.16 and 1.2.6 */
|
|---|
| 423 | png_byte compression_type;
|
|---|
| 424 |
|
|---|
| 425 | #ifdef PNG_USER_LIMITS_SUPPORTED
|
|---|
| 426 | png_uint_32 user_width_max;
|
|---|
| 427 | png_uint_32 user_height_max;
|
|---|
| 428 |
|
|---|
| 429 | /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
|
|---|
| 430 | * chunks that can be stored (0 means unlimited).
|
|---|
| 431 | */
|
|---|
| 432 | png_uint_32 user_chunk_cache_max;
|
|---|
| 433 |
|
|---|
| 434 | /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk
|
|---|
| 435 | * can occupy when decompressed. 0 means unlimited.
|
|---|
| 436 | */
|
|---|
| 437 | png_alloc_size_t user_chunk_malloc_max;
|
|---|
| 438 | #endif
|
|---|
| 439 |
|
|---|
| 440 | /* New member added in libpng-1.0.25 and 1.2.17 */
|
|---|
| 441 | #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
|
|---|
| 442 | /* Temporary storage for unknown chunk that the library doesn't recognize,
|
|---|
| 443 | * used while reading the chunk.
|
|---|
| 444 | */
|
|---|
| 445 | png_unknown_chunk unknown_chunk;
|
|---|
| 446 | #endif
|
|---|
| 447 |
|
|---|
| 448 | /* New member added in libpng-1.2.26 */
|
|---|
| 449 | size_t old_big_row_buf_size;
|
|---|
| 450 |
|
|---|
| 451 | #ifdef PNG_READ_SUPPORTED
|
|---|
| 452 | /* New member added in libpng-1.2.30 */
|
|---|
| 453 | png_bytep read_buffer; /* buffer for reading chunk data */
|
|---|
| 454 | png_alloc_size_t read_buffer_size; /* current size of the buffer */
|
|---|
| 455 | #endif
|
|---|
| 456 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|---|
| 457 | uInt IDAT_read_size; /* limit on read buffer size for IDAT */
|
|---|
| 458 | #endif
|
|---|
| 459 |
|
|---|
| 460 | #ifdef PNG_IO_STATE_SUPPORTED
|
|---|
| 461 | /* New member added in libpng-1.4.0 */
|
|---|
| 462 | png_uint_32 io_state;
|
|---|
| 463 | #endif
|
|---|
| 464 |
|
|---|
| 465 | /* New member added in libpng-1.5.6 */
|
|---|
| 466 | png_bytep big_prev_row;
|
|---|
| 467 |
|
|---|
| 468 | /* New member added in libpng-1.5.7 */
|
|---|
| 469 | void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info,
|
|---|
| 470 | png_bytep row, png_const_bytep prev_row);
|
|---|
| 471 |
|
|---|
| 472 | #ifdef PNG_READ_SUPPORTED
|
|---|
| 473 | #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
|
|---|
| 474 | png_colorspace colorspace;
|
|---|
| 475 | #endif
|
|---|
| 476 | #endif
|
|---|
| 477 | };
|
|---|
| 478 | #endif /* PNGSTRUCT_H */
|
|---|
