/* pngstruct.h - header file for PNG reference library
*
- * Copyright (c) 1998-2012 Glenn Randers-Pehrson
+ * Last changed in libpng 1.6.1 [March 28, 2013]
+ * 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 1.5.9 [February 18, 2012]
- *
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
* 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 longjmp_buffer; /* 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_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) */
-#ifdef PNG_WRITE_SUPPORTED
+ png_uint_32 zowner; /* ID (chunk type) of zstream owner, 0 if none */
+ z_stream zstream; /* decompression structure */
-/* Added in 1.5.4: state to keep track of whether the zstream has been
- * initialized and if so whether it is for IDAT or some other chunk.
- */
-#define PNG_ZLIB_UNINITIALIZED 0
-#define PNG_ZLIB_FOR_IDAT 1
-#define PNG_ZLIB_FOR_TEXT 2 /* anything other than IDAT */
-#define PNG_ZLIB_USE_MASK 3 /* bottom two bits */
-#define PNG_ZLIB_IN_USE 4 /* a flag value */
-
- png_uint_32 zlib_state; /* State of zlib initialization */
-/* End of material added at libpng 1.5.4 */
+#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_strategy; /* holds zlib compression strategy */
#endif
/* Added at libpng 1.5.4 */
-#if defined(PNG_WRITE_COMPRESSED_TEXT_SUPPORTED) || \
- defined(PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED)
+#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_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 */
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 */
+#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_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 */
+#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 */
- png_byte io_chunk_string[5];
- /* string name of chunk */
-
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
png_uint_16 filler; /* filler bytes for pixel expansion */
#endif
#ifdef PNG_READ_GAMMA_SUPPORTED
png_color_16 background_1; /* background normalized to gamma 1.0 */
#endif
-#endif /* PNG_bKGD_SUPPORTED */
+#endif /* bKGD */
#ifdef PNG_WRITE_FLUSH_SUPPORTED
png_flush_ptr output_flush_fn; /* Function for flushing output */
#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) */
png_bytep gamma_table; /* gamma table for 8-bit depth files */
int process_mode; /* what push library is currently doing */
int cur_palette; /* current push library palette index */
-#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
+#endif /* PROGRESSIVE_READ */
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
/* For the Borland special 64K segment handler */
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 */
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
- /* This is going to be unused in libpng16 and removed from libpng17 */
char time_buffer[29]; /* String to hold RFC 1123 time text */
#endif
+#endif
/* New members added in libpng-1.0.6 */
#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
-
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
- int num_chunk_list;
- png_bytep chunk_list;
#endif
-#ifdef PNG_READ_sRGB_SUPPORTED
- /* Added in 1.5.5 to record an sRGB chunk in the png. */
- png_byte is_sRGB;
+#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 */
#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 member added in libpng-1.2.26 */
png_size_t old_big_row_buf_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 */
/* 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 */
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