1,11 → 1,11 |
|
/* pngstruct.h - header file for PNG reference library |
* |
* Copyright (c) 1998-2011 Glenn Randers-Pehrson |
* Copyright (c) 1998-2013 Glenn Randers-Pehrson |
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
* |
* Last changed in libpng 1.5.0 [January 6, 2011] |
* Last changed in libpng 1.6.1 [March 28, 2013] |
* |
* This code is released under the libpng license. |
* For conditions of distribution and use, see the disclaimer |
24,16 → 24,135 |
* in this structure and is required for decompressing the LZ compressed |
* data in PNG files. |
*/ |
#ifndef ZLIB_CONST |
/* We must ensure that zlib uses 'const' in declarations. */ |
# define ZLIB_CONST |
#endif |
#include "zlib.h" |
#ifdef const |
/* zlib.h sometimes #defines const to nothing, undo this. */ |
# undef const |
#endif |
|
/* zlib.h has mediocre z_const use before 1.2.6, this stuff is for compatibility |
* with older builds. |
*/ |
#if ZLIB_VERNUM < 0x1260 |
# define PNGZ_MSG_CAST(s) png_constcast(char*,s) |
# define PNGZ_INPUT_CAST(b) png_constcast(png_bytep,b) |
#else |
# define PNGZ_MSG_CAST(s) (s) |
# define PNGZ_INPUT_CAST(b) (b) |
#endif |
|
/* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib |
* can handle at once. This type need be no larger than 16 bits (so maximum of |
* 65535), this define allows us to discover how big it is, but limited by the |
* maximuum for png_size_t. The value can be overriden in a library build |
* (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably |
* lower value (e.g. 255 works). A lower value may help memory usage (slightly) |
* and may even improve performance on some systems (and degrade it on others.) |
*/ |
#ifndef ZLIB_IO_MAX |
# define ZLIB_IO_MAX ((uInt)-1) |
#endif |
|
#ifdef PNG_WRITE_SUPPORTED |
/* The type of a compression buffer list used by the write code. */ |
typedef struct png_compression_buffer |
{ |
struct png_compression_buffer *next; |
png_byte output[1]; /* actually zbuf_size */ |
} png_compression_buffer, *png_compression_bufferp; |
|
#define PNG_COMPRESSION_BUFFER_SIZE(pp)\ |
(offsetof(png_compression_buffer, output) + (pp)->zbuffer_size) |
#endif |
|
/* Colorspace support; structures used in png_struct, png_info and in internal |
* functions to hold and communicate information about the color space. |
* |
* PNG_COLORSPACE_SUPPORTED is only required if the application will perform |
* colorspace corrections, otherwise all the colorspace information can be |
* skipped and the size of libpng can be reduced (significantly) by compiling |
* out the colorspace support. |
*/ |
#ifdef PNG_COLORSPACE_SUPPORTED |
/* The chromaticities of the red, green and blue colorants and the chromaticity |
* of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)). |
*/ |
typedef struct png_xy |
{ |
png_fixed_point redx, redy; |
png_fixed_point greenx, greeny; |
png_fixed_point bluex, bluey; |
png_fixed_point whitex, whitey; |
} png_xy; |
|
/* The same data as above but encoded as CIE XYZ values. When this data comes |
* from chromaticities the sum of the Y values is assumed to be 1.0 |
*/ |
typedef struct png_XYZ |
{ |
png_fixed_point red_X, red_Y, red_Z; |
png_fixed_point green_X, green_Y, green_Z; |
png_fixed_point blue_X, blue_Y, blue_Z; |
} png_XYZ; |
#endif /* COLORSPACE */ |
|
#if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED) |
/* A colorspace is all the above plus, potentially, profile information, |
* however at present libpng does not use the profile internally so it is only |
* stored in the png_info struct (if iCCP is supported.) The rendering intent |
* is retained here and is checked. |
* |
* The file gamma encoding information is also stored here and gamma correction |
* is done by libpng, whereas color correction must currently be done by the |
* application. |
*/ |
typedef struct png_colorspace |
{ |
#ifdef PNG_GAMMA_SUPPORTED |
png_fixed_point gamma; /* File gamma */ |
#endif |
|
#ifdef PNG_COLORSPACE_SUPPORTED |
png_xy end_points_xy; /* End points as chromaticities */ |
png_XYZ end_points_XYZ; /* End points as CIE XYZ colorant values */ |
png_uint_16 rendering_intent; /* Rendering intent of a profile */ |
#endif |
|
/* Flags are always defined to simplify the code. */ |
png_uint_16 flags; /* As defined below */ |
} png_colorspace, * PNG_RESTRICT png_colorspacerp; |
|
typedef const png_colorspace * PNG_RESTRICT png_const_colorspacerp; |
|
/* General flags for the 'flags' field */ |
#define PNG_COLORSPACE_HAVE_GAMMA 0x0001 |
#define PNG_COLORSPACE_HAVE_ENDPOINTS 0x0002 |
#define PNG_COLORSPACE_HAVE_INTENT 0x0004 |
#define PNG_COLORSPACE_FROM_gAMA 0x0008 |
#define PNG_COLORSPACE_FROM_cHRM 0x0010 |
#define PNG_COLORSPACE_FROM_sRGB 0x0020 |
#define PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB 0x0040 |
#define PNG_COLORSPACE_MATCHES_sRGB 0x0080 /* exact match on profile */ |
#define PNG_COLORSPACE_INVALID 0x8000 |
#define PNG_COLORSPACE_CANCEL(flags) (0xffff ^ (flags)) |
#endif /* COLORSPACE || GAMMA */ |
|
struct png_struct_def |
{ |
#ifdef PNG_SETJMP_SUPPORTED |
jmp_buf png_jmpbuf; /* used in png_error */ |
jmp_buf jmp_buf_local; /* New name in 1.6.0 for jmp_buf in png_struct */ |
png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */ |
jmp_buf *jmp_buf_ptr; /* passed to longjmp_fn */ |
size_t jmp_buf_size; /* size of the above, if allocated */ |
#endif |
png_error_ptr error_fn; /* function for printing errors and aborting */ |
#ifdef PNG_WARNINGS_SUPPORTED |
png_error_ptr warning_fn; /* function for printing warnings */ |
#endif |
png_voidp error_ptr; /* user supplied struct for error functions */ |
png_rw_ptr write_data_fn; /* function for writing output data */ |
png_rw_ptr read_data_fn; /* function for reading input data */ |
61,14 → 180,36 |
png_uint_32 flags; /* flags indicating various things to libpng */ |
png_uint_32 transformations; /* which transformations to perform */ |
|
z_stream zstream; /* pointer to decompression structure (below) */ |
png_bytep zbuf; /* buffer for zlib */ |
uInt zbuf_size; /* size of zbuf (typically 65536) */ |
png_uint_32 zowner; /* ID (chunk type) of zstream owner, 0 if none */ |
z_stream zstream; /* decompression structure */ |
|
#ifdef PNG_WRITE_SUPPORTED |
png_compression_bufferp zbuffer_list; /* Created on demand during write */ |
uInt zbuffer_size; /* size of the actual buffer */ |
|
int zlib_level; /* holds zlib compression level */ |
int zlib_method; /* holds zlib compression method */ |
int zlib_window_bits; /* holds zlib compression window bits */ |
int zlib_mem_level; /* holds zlib compression memory level */ |
int zlib_strategy; /* holds zlib compression strategy */ |
#endif |
/* Added at libpng 1.5.4 */ |
#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED |
int zlib_text_level; /* holds zlib compression level */ |
int zlib_text_method; /* holds zlib compression method */ |
int zlib_text_window_bits; /* holds zlib compression window bits */ |
int zlib_text_mem_level; /* holds zlib compression memory level */ |
int zlib_text_strategy; /* holds zlib compression strategy */ |
#endif |
/* End of material added at libpng 1.5.4 */ |
/* Added at libpng 1.6.0 */ |
#ifdef PNG_WRITE_SUPPORTED |
int zlib_set_level; /* Actual values set into the zstream on write */ |
int zlib_set_method; |
int zlib_set_window_bits; |
int zlib_set_mem_level; |
int zlib_set_strategy; |
#endif |
|
png_uint_32 width; /* width of image in pixels */ |
png_uint_32 height; /* height of image in pixels */ |
77,20 → 218,32 |
png_size_t rowbytes; /* size of row in bytes */ |
png_uint_32 iwidth; /* width of current interlaced row in pixels */ |
png_uint_32 row_number; /* current row in interlace pass */ |
png_bytep prev_row; /* buffer to save previous (unfiltered) row */ |
png_bytep row_buf; /* buffer to save current (unfiltered) row */ |
png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */ |
png_bytep prev_row; /* buffer to save previous (unfiltered) row. |
* This is a pointer into big_prev_row |
*/ |
png_bytep row_buf; /* buffer to save current (unfiltered) row. |
* This is a pointer into big_row_buf |
*/ |
#ifdef PNG_WRITE_SUPPORTED |
png_bytep sub_row; /* buffer to save "sub" row when filtering */ |
png_bytep up_row; /* buffer to save "up" row when filtering */ |
png_bytep avg_row; /* buffer to save "avg" row when filtering */ |
png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ |
png_row_info row_info; /* used for transformation routines */ |
#endif |
png_size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */ |
|
png_uint_32 idat_size; /* current IDAT size for read */ |
png_uint_32 crc; /* current chunk CRC value */ |
png_colorp palette; /* palette from the input file */ |
png_uint_16 num_palette; /* number of color entries in palette */ |
|
/* Added at libpng-1.5.10 */ |
#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED |
int num_palette_max; /* maximum palette index found in IDAT */ |
#endif |
|
png_uint_16 num_trans; /* number of transparency values */ |
png_byte chunk_name[5]; /* null-terminated name of current chunk */ |
png_byte compression; /* file compression type (always 0) */ |
png_byte filter; /* file filter type (always 0) */ |
png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ |
98,17 → 251,23 |
png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ |
png_byte color_type; /* color type of file */ |
png_byte bit_depth; /* bit depth of file */ |
png_byte usr_bit_depth; /* bit depth of users row */ |
png_byte usr_bit_depth; /* bit depth of users row: write only */ |
png_byte pixel_depth; /* number of bits per pixel */ |
png_byte channels; /* number of channels in file */ |
png_byte usr_channels; /* channels at start of write */ |
#ifdef PNG_WRITE_SUPPORTED |
png_byte usr_channels; /* channels at start of write: write only */ |
#endif |
png_byte sig_bytes; /* magic bytes read/written from start of file */ |
|
png_byte maximum_pixel_depth; |
/* pixel depth used for the row buffers */ |
png_byte transformed_pixel_depth; |
/* pixel depth after read/write transforms */ |
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
png_uint_16 filler; /* filler bytes for pixel expansion */ |
#endif |
|
#ifdef PNG_bKGD_SUPPORTED |
#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ |
defined(PNG_READ_ALPHA_MODE_SUPPORTED) |
png_byte background_gamma_type; |
png_fixed_point background_gamma; |
png_color_16 background; /* background color in screen gamma space */ |
123,19 → 282,20 |
png_uint_32 flush_rows; /* number of rows written since last flush */ |
#endif |
|
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
#ifdef PNG_READ_GAMMA_SUPPORTED |
int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */ |
png_fixed_point gamma; /* file gamma value */ |
png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */ |
#endif |
|
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
png_bytep gamma_table; /* gamma table for 8-bit depth files */ |
png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ |
#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ |
defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \ |
defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
png_bytep gamma_from_1; /* converts from 1.0 to screen */ |
png_bytep gamma_to_1; /* converts from file to 1.0 */ |
png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ |
png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ |
png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ |
#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */ |
#endif |
|
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) |
171,13 → 331,6 |
int process_mode; /* what push library is currently doing */ |
int cur_palette; /* current push library palette index */ |
|
# ifdef PNG_TEXT_SUPPORTED |
png_size_t current_text_size; /* current size of text input data */ |
png_size_t current_text_left; /* how much text left to read in input */ |
png_charp current_text; /* current text chunk buffer */ |
png_charp current_text_ptr; /* current location in current_text */ |
# endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */ |
|
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
|
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) |
194,10 → 347,6 |
png_bytep quantize_index; /* index translation for palette files */ |
#endif |
|
#if defined(PNG_READ_QUANTIZE_SUPPORTED) || defined(PNG_hIST_SUPPORTED) |
png_uint_16p hist; /* histogram */ |
#endif |
|
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
png_byte heuristic_method; /* heuristic for row filter selection */ |
png_byte num_prev_filters; /* number of weights for previous rows */ |
208,9 → 357,17 |
png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ |
#endif |
|
/* Options */ |
#ifdef PNG_SET_OPTION_SUPPORTED |
png_byte options; /* On/off state (up to 4 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 → 375,31 |
|
#ifdef PNG_USER_CHUNKS_SUPPORTED |
png_voidp user_chunk_ptr; |
#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 → 449,41 |
#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 */ |