/* The structure that holds the information to read and write PNG files. * 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, except to store * the jmp_buf. */ struct png_struct_def { #ifdef PNG_SETJMP_SUPPORTED jmp_buf jmpbuf PNG_DEPSTRUCT; /* used in png_error */ png_longjmp_ptr longjmp_fn PNG_DEPSTRUCT;/* setjmp non-local goto function. */ #endif png_error_ptr error_fn PNG_DEPSTRUCT; /* function for printing errors and aborting */ png_error_ptr warning_fn PNG_DEPSTRUCT; /* function for printing warnings */ png_voidp error_ptr PNG_DEPSTRUCT; /* user supplied struct for error functions */ png_rw_ptr write_data_fn PNG_DEPSTRUCT; /* function for writing output data */ png_rw_ptr read_data_fn PNG_DEPSTRUCT; /* function for reading input data */ png_voidp io_ptr PNG_DEPSTRUCT; /* ptr to application struct for I/O functions */ #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read transform */ #endif #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write transform */ #endif /* These were added in libpng-1.0.2 */ #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct for user transform */ png_byte user_transform_depth PNG_DEPSTRUCT; /* bit depth of user transformed pixels */ png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user transformed pixels */ #endif #endif png_uint_32 mode PNG_DEPSTRUCT; /* tells us where we are in the PNG file */ png_uint_32 flags PNG_DEPSTRUCT; /* flags indicating various things to libpng */ png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations to perform */ z_stream zstream PNG_DEPSTRUCT; /* pointer to decompression structure (below) */ png_bytep zbuf PNG_DEPSTRUCT; /* buffer for zlib */ png_size_t zbuf_size PNG_DEPSTRUCT; /* size of zbuf */ int zlib_level PNG_DEPSTRUCT; /* holds zlib compression level */ int zlib_method PNG_DEPSTRUCT; /* holds zlib compression method */ int zlib_window_bits PNG_DEPSTRUCT; /* holds zlib compression window bits */ int zlib_mem_level PNG_DEPSTRUCT; /* holds zlib compression memory level */ int zlib_strategy PNG_DEPSTRUCT; /* holds zlib compression strategy */ png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels */ png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels */ png_uint_32 num_rows PNG_DEPSTRUCT; /* number of rows in current pass */ png_uint_32 usr_width PNG_DEPSTRUCT; /* width of row at start of write */ png_size_t rowbytes PNG_DEPSTRUCT; /* size of row in bytes */ png_uint_32 iwidth PNG_DEPSTRUCT; /* width of current interlaced row in pixels */ png_uint_32 row_number PNG_DEPSTRUCT; /* current row in interlace pass */ png_bytep prev_row PNG_DEPSTRUCT; /* buffer to save previous (unfiltered) row */ png_bytep row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ png_bytep sub_row PNG_DEPSTRUCT; /* buffer to save "sub" row when filtering */ png_bytep up_row PNG_DEPSTRUCT; /* buffer to save "up" row when filtering */ png_bytep avg_row PNG_DEPSTRUCT; /* buffer to save "avg" row when filtering */ png_bytep paeth_row PNG_DEPSTRUCT; /* buffer to save "Paeth" row when filtering */ png_row_info row_info PNG_DEPSTRUCT; /* used for transformation routines */ png_uint_32 idat_size PNG_DEPSTRUCT; /* current IDAT size for read */ png_uint_32 crc PNG_DEPSTRUCT; /* current chunk CRC value */ png_colorp palette PNG_DEPSTRUCT; /* palette from the input file */ png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in palette */ png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparency values */ png_byte chunk_name[5] PNG_DEPSTRUCT; /* null-terminated name of current chunk */ png_byte compression PNG_DEPSTRUCT; /* file compression type (always 0) */ png_byte filter PNG_DEPSTRUCT; /* file filter type (always 0) */ png_byte interlaced PNG_DEPSTRUCT; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ png_byte pass PNG_DEPSTRUCT; /* current interlace pass (0 - 6) */ png_byte do_filter PNG_DEPSTRUCT; /* row filter flags (see PNG_FILTER_ below ) */ png_byte color_type PNG_DEPSTRUCT; /* color type of file */ png_byte bit_depth PNG_DEPSTRUCT; /* bit depth of file */ png_byte usr_bit_depth PNG_DEPSTRUCT; /* bit depth of users row */ png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ png_byte channels PNG_DEPSTRUCT; /* number of channels in file */ png_byte usr_channels PNG_DEPSTRUCT; /* channels at start of write */ png_byte sig_bytes PNG_DEPSTRUCT; /* magic bytes read/written from start of file */ #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) png_uint_16 filler PNG_DEPSTRUCT; /* filler bytes for pixel expansion */ #endif #ifdef PNG_bKGD_SUPPORTED png_byte background_gamma_type PNG_DEPSTRUCT; # ifdef PNG_FLOATING_POINT_SUPPORTED float background_gamma PNG_DEPSTRUCT; # endif png_color_16 background PNG_DEPSTRUCT; /* background color in screen gamma space */ #ifdef PNG_READ_GAMMA_SUPPORTED png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized to gamma 1.0 */ #endif #endif /* PNG_bKGD_SUPPORTED */ #ifdef PNG_WRITE_FLUSH_SUPPORTED png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing output */ png_uint_32 flush_dist PNG_DEPSTRUCT; /* how many rows apart to flush, 0 - no flush */ png_uint_32 flush_rows PNG_DEPSTRUCT; /* number of rows written since last flush */ #endif #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) int gamma_shift PNG_DEPSTRUCT; /* number of "insignificant" bits 16-bit gamma */ #ifdef PNG_FLOATING_POINT_SUPPORTED float gamma PNG_DEPSTRUCT; /* file gamma value */ float screen_gamma PNG_DEPSTRUCT; /* screen gamma value (display_exponent) */ #endif #endif #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) png_bytep gamma_table PNG_DEPSTRUCT; /* gamma table for 8-bit depth files */ png_bytep gamma_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ png_bytep gamma_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit depth files */ png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ #endif #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in each available channel */ #endif #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) png_color_8 shift PNG_DEPSTRUCT; /* shift for significant bit tranformation */ #endif #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) png_bytep trans_alpha PNG_DEPSTRUCT; /* alpha values for paletted files */ png_color_16 trans_color PNG_DEPSTRUCT; /* transparent color for non-paletted files */ #endif png_read_status_ptr read_row_fn PNG_DEPSTRUCT; /* called after each row is decoded */ png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each row is encoded */ #ifdef PNG_PROGRESSIVE_READ_SUPPORTED png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header data fully read */ png_progressive_row_ptr row_fn PNG_DEPSTRUCT; /* called after each prog. row is decoded */ png_progressive_end_ptr end_fn PNG_DEPSTRUCT; /* called after image is complete */ png_bytep save_buffer_ptr PNG_DEPSTRUCT; /* current location in save_buffer */ png_bytep save_buffer PNG_DEPSTRUCT; /* buffer for previously read data */ png_bytep current_buffer_ptr PNG_DEPSTRUCT; /* current location in current_buffer */ png_bytep current_buffer PNG_DEPSTRUCT; /* buffer for recently used data */ png_uint_32 push_length PNG_DEPSTRUCT; /* size of current input chunk */ png_uint_32 skip_length PNG_DEPSTRUCT; /* bytes to skip in input data */ png_size_t save_buffer_size PNG_DEPSTRUCT; /* amount of data now in save_buffer */ png_size_t save_buffer_max PNG_DEPSTRUCT; /* total size of save_buffer */ png_size_t buffer_size PNG_DEPSTRUCT; /* total amount of available input data */ png_size_t current_buffer_size PNG_DEPSTRUCT; /* amount of data now in current_buffer */ int process_mode PNG_DEPSTRUCT; /* what push library is currently doing */ int cur_palette PNG_DEPSTRUCT; /* current push library palette index */ # ifdef PNG_TEXT_SUPPORTED png_size_t current_text_size PNG_DEPSTRUCT; /* current size of text input data */ png_size_t current_text_left PNG_DEPSTRUCT; /* how much text left to read in input */ png_charp current_text PNG_DEPSTRUCT; /* current text chunk buffer */ png_charp current_text_ptr PNG_DEPSTRUCT; /* 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__) /* For the Borland special 64K segment handler */ png_bytepp offset_table_ptr PNG_DEPSTRUCT; png_bytep offset_table PNG_DEPSTRUCT; png_uint_16 offset_table_number PNG_DEPSTRUCT; png_uint_16 offset_table_count PNG_DEPSTRUCT; png_uint_16 offset_table_count_free PNG_DEPSTRUCT; #endif #ifdef PNG_READ_DITHER_SUPPORTED png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for dithering */ png_bytep dither_index PNG_DEPSTRUCT; /* index translation for palette files */ #endif #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) png_uint_16p hist PNG_DEPSTRUCT; /* histogram */ #endif #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED png_byte heuristic_method PNG_DEPSTRUCT; /* heuristic for row filter selection */ png_byte num_prev_filters PNG_DEPSTRUCT; /* number of weights for previous rows */ png_bytep prev_filters PNG_DEPSTRUCT; /* filter type(s) of previous row(s) */ png_uint_16p filter_weights PNG_DEPSTRUCT; /* weight(s) for previous line(s) */ png_uint_16p inv_filter_weights PNG_DEPSTRUCT; /* 1/weight(s) for previous line(s) */ png_uint_16p filter_costs PNG_DEPSTRUCT; /* relative filter calculation cost */ png_uint_16p inv_filter_costs PNG_DEPSTRUCT; /* 1/relative filter calculation cost */ #endif #ifdef PNG_TIME_RFC1123_SUPPORTED png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */ #endif /* New members added in libpng-1.0.6 */ png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */ #ifdef PNG_USER_CHUNKS_SUPPORTED png_voidp user_chunk_ptr PNG_DEPSTRUCT; png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read chunk handler */ #endif #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED int num_chunk_list PNG_DEPSTRUCT; png_bytep chunk_list PNG_DEPSTRUCT; #endif /* New members added in libpng-1.0.3 */ #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED png_byte rgb_to_gray_status PNG_DEPSTRUCT; /* These were changed from png_byte in libpng-1.0.6 */ png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT; png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT; png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT; #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) /* Changed from png_byte to png_uint_32 at version 1.2.0 */ png_uint_32 mng_features_permitted PNG_DEPSTRUCT; #endif /* New member added in libpng-1.0.7 */ #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) png_fixed_point int_gamma PNG_DEPSTRUCT; #endif /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ #ifdef PNG_MNG_FEATURES_SUPPORTED png_byte filter_type PNG_DEPSTRUCT; #endif /* New members added in libpng-1.2.0 */ /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ #ifdef PNG_USER_MEM_SUPPORTED png_voidp mem_ptr PNG_DEPSTRUCT; /* user supplied struct for mem functions */ png_malloc_ptr malloc_fn PNG_DEPSTRUCT; /* function for allocating memory */ png_free_ptr free_fn PNG_DEPSTRUCT; /* function for freeing memory */ #endif /* New member added in libpng-1.0.13 and 1.2.0 */ png_bytep big_row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ #ifdef PNG_READ_DITHER_SUPPORTED /* The following three members were added at version 1.0.14 and 1.2.4 */ png_bytep dither_sort PNG_DEPSTRUCT; /* working sort array */ png_bytep index_to_palette PNG_DEPSTRUCT; /* where the original index currently is in the palette */ png_bytep palette_to_index PNG_DEPSTRUCT; /* which original index points to this palette color */ #endif /* New members added in libpng-1.0.16 and 1.2.6 */ png_byte compression_type PNG_DEPSTRUCT; #ifdef PNG_USER_LIMITS_SUPPORTED png_uint_32 user_width_max PNG_DEPSTRUCT; png_uint_32 user_height_max PNG_DEPSTRUCT; /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown * chunks that can be stored (0 means unlimited). */ png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT; /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk * can occupy when decompressed. 0 means unlimited. */ png_uint_32 user_chunk_malloc_max PNG_DEPSTRUCT; #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. */ png_unknown_chunk unknown_chunk PNG_DEPSTRUCT; #endif /* New members added in libpng-1.2.26 */ png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT; png_uint_32 old_prev_row_size PNG_DEPSTRUCT; /* New member added in libpng-1.2.30 */ png_charp chunkdata PNG_DEPSTRUCT; /* buffer for reading chunk data */ #ifdef PNG_IO_STATE_SUPPORTED /* New member added in libpng-1.4.0 */ png_uint_32 io_state PNG_DEPSTRUCT; #endif };