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 *

 * Copyright (c) 1998-2011 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]

 *

 * This code is released under the libpng license.

 * For conditions of distribution and use, see the disclaimer

 * and license in png.h

 */

 * The only people who need to care about what is inside of this are the

 * people who will be modifying the library for their own special needs.

 * It should NOT be accessed directly by an application.

 */

#define PNGSTRUCT_H

/* zlib.h defines the structure z_stream, an instance of which is included

 * in this structure and is required for decompressing the LZ compressed

 * data in PNG files.

 */

#include "zlib.h"

{

#ifdef PNG_SETJMP_SUPPORTED

   jmp_buf png_jmpbuf;            /* used in png_error */

   png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */

#endif

   png_error_ptr error_fn;    /* function for printing errors and aborting */

   png_error_ptr warning_fn;  /* function for printing warnings */

   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 */

   png_voidp io_ptr;          /* ptr to application struct for I/O functions */

   png_user_transform_ptr read_user_transform_fn; /* user read transform */

#endif

   png_user_transform_ptr write_user_transform_fn; /* user write transform */

#endif

#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED

#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \

    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)

   png_voidp user_transform_ptr; /* user supplied struct for user transform */

   png_byte user_transform_depth;    /* bit depth of user transformed pixels */

   png_byte user_transform_channels; /* channels in user transformed pixels */

#endif

#endif

   png_uint_32 flags;         /* flags indicating various things to libpng */

   png_uint_32 transformations; /* which transformations to perform */

   png_bytep zbuf;            /* buffer for zlib */

   uInt zbuf_size;            /* size of zbuf (typically 65536) */

   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 */

   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 */

   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_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 */

   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 */

   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 */

   png_byte pass;             /* current interlace pass (0 - 6) */

   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 pixel_depth;      /* number of bits per pixel */

   png_byte channels;         /* number of channels in file */

   png_byte usr_channels;     /* channels at start of write */

   png_byte sig_bytes;        /* magic bytes read/written from start of file */

   png_uint_16 filler;           /* filler bytes for pixel expansion */

#endif

   png_byte background_gamma_type;

   png_fixed_point background_gamma;

   png_color_16 background;   /* background color in screen gamma space */

#ifdef PNG_READ_GAMMA_SUPPORTED

   png_color_16 background_1; /* background normalized to gamma 1.0 */

#endif

#endif /* PNG_bKGD_SUPPORTED */

   png_flush_ptr output_flush_fn; /* Function for flushing output */

   png_uint_32 flush_dist;    /* how many rows apart to flush, 0 - no flush */

   png_uint_32 flush_rows;    /* number of rows written since last flush */

#endif

   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

   png_bytep gamma_table;     /* gamma table for 8-bit depth files */

   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

   png_color_8 sig_bit;       /* significant bits in each available channel */

#endif

   png_color_8 shift;         /* shift for significant bit tranformation */

#endif

 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)

   png_bytep trans_alpha;           /* alpha values for paletted files */

   png_color_16 trans_color;  /* transparent color for non-paletted files */

#endif

   png_write_status_ptr write_row_fn; /* called after each row is encoded */

#ifdef PNG_PROGRESSIVE_READ_SUPPORTED

   png_progressive_info_ptr info_fn; /* called after header data fully read */

   png_progressive_row_ptr row_fn;   /* called after a prog. row is decoded */

   png_progressive_end_ptr end_fn;   /* called after image is complete */

   png_bytep save_buffer_ptr;        /* current location in save_buffer */

   png_bytep save_buffer;            /* buffer for previously read data */

   png_bytep current_buffer_ptr;     /* current location in current_buffer */

   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 */

   int process_mode;                 /* what push library is currently doing */

   int cur_palette;                  /* current push library palette index */

     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 */

/* For the Borland special 64K segment handler */

   png_bytepp offset_table_ptr;

   png_bytep offset_table;

   png_uint_16 offset_table_number;

   png_uint_16 offset_table_count;

   png_uint_16 offset_table_count_free;

#endif

   png_bytep palette_lookup; /* lookup table for quantizing */

   png_bytep quantize_index; /* index translation for palette files */

#endif

   png_uint_16p hist;                /* histogram */

#endif

   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

   png_charp time_buffer; /* String to hold RFC 1123 time text */

#endif

   png_voidp user_chunk_ptr;

   png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */

#endif

   int num_chunk_list;

   png_bytep chunk_list;

#endif

#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED

   png_byte rgb_to_gray_status;

   /* 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;

#endif

#if defined(PNG_MNG_FEATURES_SUPPORTED) || \

    defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \

    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)

/* Changed from png_byte to png_uint_32 at version 1.2.0 */

   png_uint_32 mng_features_permitted;

#endif

#ifdef PNG_MNG_FEATURES_SUPPORTED

   png_byte filter_type;

#endif

#ifdef PNG_USER_MEM_SUPPORTED

   png_voidp mem_ptr;             /* user supplied struct for mem functions */

   png_malloc_ptr malloc_fn;      /* function for allocating memory */

   png_free_ptr free_fn;          /* function for freeing memory */

#endif

   png_bytep big_row_buf;         /* buffer to save current (unfiltered) row */

/* The following three members were added at version 1.0.14 and 1.2.4 */

   png_bytep quantize_sort;          /* working sort array */

   png_bytep index_to_palette;       /* where the original index currently is

                                        in the palette */

   png_bytep palette_to_index;       /* which original index points to this

                                         palette color */

#endif

   png_byte compression_type;

   png_uint_32 user_width_max;

   png_uint_32 user_height_max;

    * chunks that can be stored (0 means unlimited).

    */

   png_uint_32 user_chunk_cache_max;

    * can occupy when decompressed.  0 means unlimited.

    */

   png_alloc_size_t user_chunk_malloc_max;

#endif

#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED

   /* Storage for unknown chunk that the library doesn't recognize. */

   png_unknown_chunk unknown_chunk;

#endif

  png_size_t old_big_row_buf_size;

  png_size_t old_prev_row_size;

  png_charp chunkdata;  /* buffer for reading chunk data */

/* New member added in libpng-1.4.0 */

   png_uint_32 io_state;

#endif

};

#endif /* PNGSTRUCT_H */