/* pngstruct.h - header file for PNG reference library
*
- * 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 1.6.1 [March 28, 2013]
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
/* 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
+ * maximum for size_t. The value can be overridden 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.)
#endif /* COLORSPACE */
#if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
-/* A colorspace is all the above plus, potentially, profile information,
+/* 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.
png_uint_32 height; /* height of image in pixels */
png_uint_32 num_rows; /* number of rows in current pass */
png_uint_32 usr_width; /* width of row at start of write */
- png_size_t rowbytes; /* size of row in bytes */
+ 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_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
+ * While reading this is a pointer into
+ * big_prev_row; while writing it is separately
+ * allocated if needed.
*/
png_bytep row_buf; /* buffer to save current (unfiltered) row.
- * This is a pointer into big_row_buf
+ * While reading, this is a pointer into
+ * big_row_buf; while writing it is separately
+ * allocated.
*/
-#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 */
+#ifdef PNG_READ_EXPAND_SUPPORTED
+ /* Buffer to accelerate palette transformations. */
+ png_bytep riffled_palette;
+#endif
+#ifdef PNG_WRITE_FILTER_SUPPORTED
+ png_bytep try_row; /* buffer to save trial row when filtering */
+ png_bytep tst_row; /* buffer to save best trial row when filtering */
#endif
- png_size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */
+ 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_byte filter; /* file filter type (always 0) */
png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
png_byte pass; /* current interlace pass (0 - 6) */
- png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
+ png_byte do_filter; /* row filter flags (see PNG_FILTER_ in png.h ) */
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: write only */
/* pixel depth used for the row buffers */
png_byte transformed_pixel_depth;
/* pixel depth after read/write transforms */
+#if ZLIB_VERNUM >= 0x1240
+ png_byte zstream_start; /* at start of an input zlib stream */
+#endif /* Zlib >= 1.2.4 */
#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 */
#endif
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
- png_color_8 shift; /* shift for significant bit tranformation */
+ png_color_8 shift; /* shift for significant bit transformation */
#endif
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
png_bytep current_buffer; /* buffer for recently used data */
png_uint_32 push_length; /* size of current input chunk */
png_uint_32 skip_length; /* bytes to skip in input data */
- png_size_t save_buffer_size; /* amount of data now in save_buffer */
- png_size_t save_buffer_max; /* total size of save_buffer */
- png_size_t buffer_size; /* total amount of available input data */
- png_size_t current_buffer_size; /* amount of data now in current_buffer */
+ size_t save_buffer_size; /* amount of data now in save_buffer */
+ size_t save_buffer_max; /* total size of save_buffer */
+ size_t buffer_size; /* total amount of available input data */
+ size_t current_buffer_size; /* amount of data now in current_buffer */
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
-#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_bytep prev_filters; /* filter type(s) of previous row(s) */
- png_uint_16p filter_weights; /* weight(s) for previous line(s) */
- png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
- png_uint_16p filter_costs; /* relative filter calculation cost */
- png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
-#endif
-
- /* Options */
+/* Options */
#ifdef PNG_SET_OPTION_SUPPORTED
- png_byte options; /* On/off state (up to 4 options) */
+ png_uint_32 options; /* On/off state (up to 16 options) */
#endif
#if PNG_LIBPNG_VER < 10700
#endif
/* New member added in libpng-1.2.26 */
- png_size_t old_big_row_buf_size;
+ size_t old_big_row_buf_size;
#ifdef PNG_READ_SUPPORTED
/* New member added in libpng-1.2.30 */
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