png.h
上传用户:sesekoo
上传日期:2020-07-18
资源大小:21543k
文件大小:152k
- /* Values for png_set_crc_action() to say how to handle CRC errors in
- * ancillary and critical chunks, and whether to use the data contained
- * therein. Note that it is impossible to "discard" data in a critical
- * chunk. For versions prior to 0.90, the action was always error/quit,
- * whereas in version 0.90 and later, the action for CRC errors in ancillary
- * chunks is warn/discard. These values should NOT be changed.
- *
- * value action:critical action:ancillary
- */
- #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
- #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
- #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
- #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
- #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
- #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
- /* These functions give the user control over the scan-line filtering in
- * libpng and the compression methods used by zlib. These functions are
- * mainly useful for testing, as the defaults should work with most users.
- * Those users who are tight on memory or want faster performance at the
- * expense of compression can modify them. See the compression library
- * header file (zlib.h) for an explination of the compression functions.
- */
- /* set the filtering method(s) used by libpng. Currently, the only valid
- * value for "method" is 0.
- */
- extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
- int filters));
- /* Flags for png_set_filter() to say which filters to use. The flags
- * are chosen so that they don't conflict with real filter types
- * below, in case they are supplied instead of the #defined constants.
- * These values should NOT be changed.
- */
- #define PNG_NO_FILTERS 0x00
- #define PNG_FILTER_NONE 0x08
- #define PNG_FILTER_SUB 0x10
- #define PNG_FILTER_UP 0x20
- #define PNG_FILTER_AVG 0x40
- #define PNG_FILTER_PAETH 0x80
- #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP |
- PNG_FILTER_AVG | PNG_FILTER_PAETH)
- /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
- * These defines should NOT be changed.
- */
- #define PNG_FILTER_VALUE_NONE 0
- #define PNG_FILTER_VALUE_SUB 1
- #define PNG_FILTER_VALUE_UP 2
- #define PNG_FILTER_VALUE_AVG 3
- #define PNG_FILTER_VALUE_PAETH 4
- #define PNG_FILTER_VALUE_LAST 5
- #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
- /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
- * defines, either the default (minimum-sum-of-absolute-differences), or
- * the experimental method (weighted-minimum-sum-of-absolute-differences).
- *
- * Weights are factors >= 1.0, indicating how important it is to keep the
- * filter type consistent between rows. Larger numbers mean the current
- * filter is that many times as likely to be the same as the "num_weights"
- * previous filters. This is cumulative for each previous row with a weight.
- * There needs to be "num_weights" values in "filter_weights", or it can be
- * NULL if the weights aren't being specified. Weights have no influence on
- * the selection of the first row filter. Well chosen weights can (in theory)
- * improve the compression for a given image.
- *
- * Costs are factors >= 1.0 indicating the relative decoding costs of a
- * filter type. Higher costs indicate more decoding expense, and are
- * therefore less likely to be selected over a filter with lower computational
- * costs. There needs to be a value in "filter_costs" for each valid filter
- * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
- * setting the costs. Costs try to improve the speed of decompression without
- * unduly increasing the compressed image size.
- *
- * A negative weight or cost indicates the default value is to be used, and
- * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
- * The default values for both weights and costs are currently 1.0, but may
- * change if good general weighting/cost heuristics can be found. If both
- * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
- * to the UNWEIGHTED method, but with added encoding time/computation.
- */
- #ifdef PNG_FLOATING_POINT_SUPPORTED
- extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
- int heuristic_method, int num_weights, png_doublep filter_weights,
- png_doublep filter_costs));
- #endif
- #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
- /* Heuristic used for row filter selection. These defines should NOT be
- * changed.
- */
- #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
- #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
- #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
- #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
- /* Set the library compression level. Currently, valid values range from
- * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
- * (0 - no compression, 9 - "maximal" compression). Note that tests have
- * shown that zlib compression levels 3-6 usually perform as well as level 9
- * for PNG images, and do considerably fewer caclulations. In the future,
- * these values may not correspond directly to the zlib compression levels.
- */
- extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
- int level));
- extern PNG_EXPORT(void,png_set_compression_mem_level)
- PNGARG((png_structp png_ptr, int mem_level));
- extern PNG_EXPORT(void,png_set_compression_strategy)
- PNGARG((png_structp png_ptr, int strategy));
- extern PNG_EXPORT(void,png_set_compression_window_bits)
- PNGARG((png_structp png_ptr, int window_bits));
- extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
- int method));
- /* These next functions are called for input/output, memory, and error
- * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
- * and call standard C I/O routines such as fread(), fwrite(), and
- * fprintf(). These functions can be made to use other I/O routines
- * at run time for those applications that need to handle I/O in a
- * different manner by calling png_set_???_fn(). See libpng.txt for
- * more information.
- */
- #if !defined(PNG_NO_STDIO)
- /* Initialize the input/output for the PNG file to the default functions. */
- extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
- #endif
- /* Replace the (error and abort), and warning functions with user
- * supplied functions. If no messages are to be printed you must still
- * write and use replacement functions. The replacement error_fn should
- * still do a longjmp to the last setjmp location if you are using this
- * method of error handling. If error_fn or warning_fn is NULL, the
- * default function will be used.
- */
- extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
- png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
- /* Return the user pointer associated with the error functions */
- extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
- /* Replace the default data output functions with a user supplied one(s).
- * If buffered output is not used, then output_flush_fn can be set to NULL.
- * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
- * output_flush_fn will be ignored (and thus can be NULL).
- */
- extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
- png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
- /* Replace the default data input function with a user supplied one. */
- extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
- png_voidp io_ptr, png_rw_ptr read_data_fn));
- /* Return the user pointer associated with the I/O functions */
- extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
- extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
- png_read_status_ptr read_row_fn));
- extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
- png_write_status_ptr write_row_fn));
- #ifdef PNG_USER_MEM_SUPPORTED
- /* Replace the default memory allocation functions with user supplied one(s). */
- extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
- png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
- /* Return the user pointer associated with the memory functions */
- extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
- #endif
- #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) ||
- defined(PNG_LEGACY_SUPPORTED)
- extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
- png_ptr, png_user_transform_ptr read_user_transform_fn));
- #endif
- #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) ||
- defined(PNG_LEGACY_SUPPORTED)
- extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
- png_ptr, png_user_transform_ptr write_user_transform_fn));
- #endif
- #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) ||
- defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) ||
- defined(PNG_LEGACY_SUPPORTED)
- extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
- png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
- int user_transform_channels));
- /* Return the user pointer associated with the user transform functions */
- extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
- PNGARG((png_structp png_ptr));
- #endif
- #ifdef PNG_USER_CHUNKS_SUPPORTED
- extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
- png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
- extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
- png_ptr));
- #endif
- #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
- /* Sets the function callbacks for the push reader, and a pointer to a
- * user-defined structure available to the callback functions.
- */
- extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
- png_voidp progressive_ptr,
- png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
- png_progressive_end_ptr end_fn));
- /* returns the user pointer associated with the push read functions */
- extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
- PNGARG((png_structp png_ptr));
- /* function to be called when data becomes available */
- extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
- /* function that combines rows. Not very much different than the
- * png_combine_row() call. Is this even used?????
- */
- extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
- png_bytep old_row, png_bytep new_row));
- #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
- extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
- png_uint_32 size));
- #if defined(PNG_1_0_X)
- # define png_malloc_warn png_malloc
- #else
- /* Added at libpng version 1.2.4 */
- extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
- png_uint_32 size));
- #endif
- /* frees a pointer allocated by png_malloc() */
- extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
- #if defined(PNG_1_0_X)
- /* Function to allocate memory for zlib. */
- extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
- uInt size));
- /* Function to free memory for zlib */
- extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
- #endif
- /* Free data that was allocated internally */
- extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_32 free_me, int num));
- #ifdef PNG_FREE_ME_SUPPORTED
- /* Reassign responsibility for freeing existing data, whether allocated
- * by libpng or by the application */
- extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
- png_infop info_ptr, int freer, png_uint_32 mask));
- #endif
- /* assignments for png_data_freer */
- #define PNG_DESTROY_WILL_FREE_DATA 1
- #define PNG_SET_WILL_FREE_DATA 1
- #define PNG_USER_WILL_FREE_DATA 2
- /* Flags for png_ptr->free_me and info_ptr->free_me */
- #define PNG_FREE_HIST 0x0008
- #define PNG_FREE_ICCP 0x0010
- #define PNG_FREE_SPLT 0x0020
- #define PNG_FREE_ROWS 0x0040
- #define PNG_FREE_PCAL 0x0080
- #define PNG_FREE_SCAL 0x0100
- #define PNG_FREE_UNKN 0x0200
- #define PNG_FREE_LIST 0x0400
- #define PNG_FREE_PLTE 0x1000
- #define PNG_FREE_TRNS 0x2000
- #define PNG_FREE_TEXT 0x4000
- #define PNG_FREE_ALL 0x7fff
- #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
- #ifdef PNG_USER_MEM_SUPPORTED
- extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
- png_uint_32 size));
- extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
- png_voidp ptr));
- #endif
- extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
- png_voidp s1, png_voidp s2, png_uint_32 size));
- extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
- png_voidp s1, int value, png_uint_32 size));
- #if defined(USE_FAR_KEYWORD) /* memory model conversion function */
- extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
- int check));
- #endif /* USE_FAR_KEYWORD */
- #ifndef PNG_NO_ERROR_TEXT
- /* Fatal error in PNG image of libpng - can't continue */
- extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
- png_const_charp error_message));
- /* The same, but the chunk name is prepended to the error string. */
- extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
- png_const_charp error_message));
- #else
- /* Fatal error in PNG image of libpng - can't continue */
- extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));
- #endif
- #ifndef PNG_NO_WARNINGS
- /* Non-fatal error in libpng. Can continue, but may have a problem. */
- extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
- png_const_charp warning_message));
- #ifdef PNG_READ_SUPPORTED
- /* Non-fatal error in libpng, chunk name is prepended to message. */
- extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
- png_const_charp warning_message));
- #endif /* PNG_READ_SUPPORTED */
- #endif /* PNG_NO_WARNINGS */
- /* The png_set_<chunk> functions are for storing values in the png_info_struct.
- * Similarly, the png_get_<chunk> calls are used to read values from the
- * png_info_struct, either storing the parameters in the passed variables, or
- * setting pointers into the png_info_struct where the data is stored. The
- * png_get_<chunk> functions return a non-zero value if the data was available
- * in info_ptr, or return zero and do not change any of the parameters if the
- * data was not available.
- *
- * These functions should be used instead of directly accessing png_info
- * to avoid problems with future changes in the size and internal layout of
- * png_info_struct.
- */
- /* Returns "flag" if chunk data is valid in info_ptr. */
- extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_32 flag));
- /* Returns number of bytes needed to hold a transformed row. */
- extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- #if defined(PNG_INFO_IMAGE_SUPPORTED)
- /* Returns row_pointers, which is an array of pointers to scanlines that was
- returned from png_read_png(). */
- extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- /* Set row_pointers, which is an array of pointers to scanlines for use
- by png_write_png(). */
- extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_bytepp row_pointers));
- #endif
- /* Returns number of color channels in image. */
- extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- #ifdef PNG_EASY_ACCESS_SUPPORTED
- /* Returns image width in pixels. */
- extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
- png_ptr, png_infop info_ptr));
- /* Returns image height in pixels. */
- extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
- png_ptr, png_infop info_ptr));
- /* Returns image bit_depth. */
- extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
- png_ptr, png_infop info_ptr));
- /* Returns image color_type. */
- extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
- png_ptr, png_infop info_ptr));
- /* Returns image filter_type. */
- extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
- png_ptr, png_infop info_ptr));
- /* Returns image interlace_type. */
- extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
- png_ptr, png_infop info_ptr));
- /* Returns image compression_type. */
- extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
- png_ptr, png_infop info_ptr));
- /* Returns image resolution in pixels per meter, from pHYs chunk data. */
- extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
- png_ptr, png_infop info_ptr));
- extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
- png_ptr, png_infop info_ptr));
- extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
- png_ptr, png_infop info_ptr));
- /* Returns pixel aspect ratio, computed from pHYs chunk data. */
- #ifdef PNG_FLOATING_POINT_SUPPORTED
- extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
- png_ptr, png_infop info_ptr));
- #endif
- /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
- extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
- png_ptr, png_infop info_ptr));
- extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
- png_ptr, png_infop info_ptr));
- extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
- png_ptr, png_infop info_ptr));
- extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
- png_ptr, png_infop info_ptr));
- #endif /* PNG_EASY_ACCESS_SUPPORTED */
- /* Returns pointer to signature string read from PNG header */
- extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- #if defined(PNG_bKGD_SUPPORTED)
- extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_color_16p *background));
- #endif
- #if defined(PNG_bKGD_SUPPORTED)
- extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_color_16p background));
- #endif
- #if defined(PNG_cHRM_SUPPORTED)
- #ifdef PNG_FLOATING_POINT_SUPPORTED
- extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
- png_infop info_ptr, double *white_x, double *white_y, double *red_x,
- double *red_y, double *green_x, double *green_y, double *blue_x,
- double *blue_y));
- #endif
- #ifdef PNG_FIXED_POINT_SUPPORTED
- extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
- *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
- png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
- *int_blue_x, png_fixed_point *int_blue_y));
- #endif
- #endif
- #if defined(PNG_cHRM_SUPPORTED)
- #ifdef PNG_FLOATING_POINT_SUPPORTED
- extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
- png_infop info_ptr, double white_x, double white_y, double red_x,
- double red_y, double green_x, double green_y, double blue_x, double blue_y));
- #endif
- #ifdef PNG_FIXED_POINT_SUPPORTED
- extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
- png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
- int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
- png_fixed_point int_blue_y));
- #endif
- #endif
- #if defined(PNG_gAMA_SUPPORTED)
- #ifdef PNG_FLOATING_POINT_SUPPORTED
- extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
- png_infop info_ptr, double *file_gamma));
- #endif
- extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_fixed_point *int_file_gamma));
- #endif
- #if defined(PNG_gAMA_SUPPORTED)
- #ifdef PNG_FLOATING_POINT_SUPPORTED
- extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
- png_infop info_ptr, double file_gamma));
- #endif
- extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_fixed_point int_file_gamma));
- #endif
- #if defined(PNG_hIST_SUPPORTED)
- extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_16p *hist));
- #endif
- #if defined(PNG_hIST_SUPPORTED)
- extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_16p hist));
- #endif
- extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
- int *bit_depth, int *color_type, int *interlace_method,
- int *compression_method, int *filter_method));
- extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
- int color_type, int interlace_method, int compression_method,
- int filter_method));
- #if defined(PNG_oFFs_SUPPORTED)
- extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
- int *unit_type));
- #endif
- #if defined(PNG_oFFs_SUPPORTED)
- extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
- int unit_type));
- #endif
- #if defined(PNG_pCAL_SUPPORTED)
- extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
- int *type, int *nparams, png_charp *units, png_charpp *params));
- #endif
- #if defined(PNG_pCAL_SUPPORTED)
- extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
- int type, int nparams, png_charp units, png_charpp params));
- #endif
- #if defined(PNG_pHYs_SUPPORTED)
- extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
- #endif
- #if defined(PNG_pHYs_SUPPORTED)
- extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
- #endif
- extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_colorp *palette, int *num_palette));
- extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_colorp palette, int num_palette));
- #if defined(PNG_sBIT_SUPPORTED)
- extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_color_8p *sig_bit));
- #endif
- #if defined(PNG_sBIT_SUPPORTED)
- extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_color_8p sig_bit));
- #endif
- #if defined(PNG_sRGB_SUPPORTED)
- extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
- png_infop info_ptr, int *intent));
- #endif
- #if defined(PNG_sRGB_SUPPORTED)
- extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
- png_infop info_ptr, int intent));
- extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
- png_infop info_ptr, int intent));
- #endif
- #if defined(PNG_iCCP_SUPPORTED)
- extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_charpp name, int *compression_type,
- png_charpp profile, png_uint_32 *proflen));
- /* Note to maintainer: profile should be png_bytepp */
- #endif
- #if defined(PNG_iCCP_SUPPORTED)
- extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_charp name, int compression_type,
- png_charp profile, png_uint_32 proflen));
- /* Note to maintainer: profile should be png_bytep */
- #endif
- #if defined(PNG_sPLT_SUPPORTED)
- extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_sPLT_tpp entries));
- #endif
- #if defined(PNG_sPLT_SUPPORTED)
- extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_sPLT_tp entries, int nentries));
- #endif
- #if defined(PNG_TEXT_SUPPORTED)
- /* png_get_text also returns the number of text chunks in *num_text */
- extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_textp *text_ptr, int *num_text));
- #endif
- /*
- * Note while png_set_text() will accept a structure whose text,
- * language, and translated keywords are NULL pointers, the structure
- * returned by png_get_text will always contain regular
- * zero-terminated C strings. They might be empty strings but
- * they will never be NULL pointers.
- */
- #if defined(PNG_TEXT_SUPPORTED)
- extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_textp text_ptr, int num_text));
- #endif
- #if defined(PNG_tIME_SUPPORTED)
- extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_timep *mod_time));
- #endif
- #if defined(PNG_tIME_SUPPORTED)
- extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_timep mod_time));
- #endif
- #if defined(PNG_tRNS_SUPPORTED)
- extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_bytep *trans, int *num_trans,
- png_color_16p *trans_values));
- #endif
- #if defined(PNG_tRNS_SUPPORTED)
- extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_bytep trans, int num_trans,
- png_color_16p trans_values));
- #endif
- #if defined(PNG_tRNS_SUPPORTED)
- #endif
- #if defined(PNG_sCAL_SUPPORTED)
- #ifdef PNG_FLOATING_POINT_SUPPORTED
- extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
- png_infop info_ptr, int *unit, double *width, double *height));
- #else
- #ifdef PNG_FIXED_POINT_SUPPORTED
- extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
- png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
- #endif
- #endif
- #endif /* PNG_sCAL_SUPPORTED */
- #if defined(PNG_sCAL_SUPPORTED)
- #ifdef PNG_FLOATING_POINT_SUPPORTED
- extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
- png_infop info_ptr, int unit, double width, double height));
- #else
- #ifdef PNG_FIXED_POINT_SUPPORTED
- extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
- png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
- #endif
- #endif
- #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
- #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
- /* provide a list of chunks and how they are to be handled, if the built-in
- handling or default unknown chunk handling is not desired. Any chunks not
- listed will be handled in the default manner. The IHDR and IEND chunks
- must not be listed.
- keep = 0: follow default behaviour
- = 1: do not keep
- = 2: keep only if safe-to-copy
- = 3: keep even if unsafe-to-copy
- */
- extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
- png_ptr, int keep, png_bytep chunk_list, int num_chunks));
- extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
- extern PNG_EXPORT(void, png_set_unknown_chunk_location)
- PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
- extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
- png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
- #endif
- #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
- PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
- chunk_name));
- #endif
- /* Png_free_data() will turn off the "valid" flag for anything it frees.
- If you need to turn it off for a chunk that your application has freed,
- you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
- extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
- png_infop info_ptr, int mask));
- #if defined(PNG_INFO_IMAGE_SUPPORTED)
- /* The "params" pointer is currently not used and is for future expansion. */
- extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
- png_infop info_ptr,
- int transforms,
- png_voidp params));
- extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
- png_infop info_ptr,
- int transforms,
- png_voidp params));
- #endif
- /* Define PNG_DEBUG at compile time for debugging information. Higher
- * numbers for PNG_DEBUG mean more debugging information. This has
- * only been added since version 0.95 so it is not implemented throughout
- * libpng yet, but more support will be added as needed.
- */
- #ifdef PNG_DEBUG
- #if (PNG_DEBUG > 0)
- #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
- #include <crtdbg.h>
- #if (PNG_DEBUG > 1)
- #ifndef _DEBUG
- # define _DEBUG
- #endif
- #ifndef png_debug
- #define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
- #endif
- #ifndef png_debug1
- #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
- #endif
- #ifndef png_debug2
- #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
- #endif
- #endif
- #else /* PNG_DEBUG_FILE || !_MSC_VER */
- #ifndef PNG_DEBUG_FILE
- #define PNG_DEBUG_FILE stderr
- #endif /* PNG_DEBUG_FILE */
- #if (PNG_DEBUG > 1)
- #ifndef png_debug
- /* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on
- * non-ISO compilers */
- #ifdef __STDC__
- #define png_debug(l,m)
- {
- int num_tabs=l;
- fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "t" :
- (num_tabs==2 ? "tt":(num_tabs>2 ? "ttt":""))));
- }
- #endif
- #ifndef png_debug1
- #define png_debug1(l,m,p1)
- {
- int num_tabs=l;
- fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "t" :
- (num_tabs==2 ? "tt":(num_tabs>2 ? "ttt":""))),p1);
- }
- #endif
- #ifndef png_debug2
- #define png_debug2(l,m,p1,p2)
- {
- int num_tabs=l;
- fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "t" :
- (num_tabs==2 ? "tt":(num_tabs>2 ? "ttt":""))),p1,p2);
- }
- #endif
- #else /* __STDC __ */
- #ifndef png_debug
- #define png_debug(l,m)
- int num_tabs=l;
- char format[256];
- snprintf(format,256,"%s%s%s",(num_tabs==1 ? "t" :
- (num_tabs==2 ? "tt":(num_tabs>2 ? "ttt":""))),
- m,PNG_STRING_NEWLINE);
- fprintf(PNG_DEBUG_FILE,format);
- #endif
- #ifndef png_debug1
- #define png_debug1(l,m,p1)
- int num_tabs=l;
- char format[256];
- snprintf(format,256,"%s%s%s",(num_tabs==1 ? "t" :
- (num_tabs==2 ? "tt":(num_tabs>2 ? "ttt":""))),
- m,PNG_STRING_NEWLINE);
- fprintf(PNG_DEBUG_FILE,format,p1);
- #endif
- #ifndef png_debug2
- #define png_debug2(l,m,p1,p2)
- int num_tabs=l;
- char format[256];
- snprintf(format,256,"%s%s%s",(num_tabs==1 ? "t" :
- (num_tabs==2 ? "tt":(num_tabs>2 ? "ttt":""))),
- m,PNG_STRING_NEWLINE);
- fprintf(PNG_DEBUG_FILE,format,p1,p2);
- #endif
- #endif /* __STDC __ */
- #endif /* (PNG_DEBUG > 1) */
- #endif /* _MSC_VER */
- #endif /* (PNG_DEBUG > 0) */
- #endif /* PNG_DEBUG */
- #ifndef png_debug
- #define png_debug(l, m)
- #endif
- #ifndef png_debug1
- #define png_debug1(l, m, p1)
- #endif
- #ifndef png_debug2
- #define png_debug2(l, m, p1, p2)
- #endif
- extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
- extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
- extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
- extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
- #ifdef PNG_MNG_FEATURES_SUPPORTED
- extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
- png_ptr, png_uint_32 mng_features_permitted));
- #endif
- /* For use in png_set_keep_unknown, added to version 1.2.6 */
- #define PNG_HANDLE_CHUNK_AS_DEFAULT 0
- #define PNG_HANDLE_CHUNK_NEVER 1
- #define PNG_HANDLE_CHUNK_IF_SAFE 2
- #define PNG_HANDLE_CHUNK_ALWAYS 3
- /* Added to version 1.2.0 */
- #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
- #if defined(PNG_MMX_CODE_SUPPORTED)
- #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
- #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
- #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
- #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
- #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
- #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
- #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
- #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
- #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
- #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW
- | PNG_ASM_FLAG_MMX_READ_INTERLACE
- | PNG_ASM_FLAG_MMX_READ_FILTER_SUB
- | PNG_ASM_FLAG_MMX_READ_FILTER_UP
- | PNG_ASM_FLAG_MMX_READ_FILTER_AVG
- | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
- #define PNG_MMX_WRITE_FLAGS ( 0 )
- #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED
- | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
- | PNG_MMX_READ_FLAGS
- | PNG_MMX_WRITE_FLAGS )
- #define PNG_SELECT_READ 1
- #define PNG_SELECT_WRITE 2
- #endif /* PNG_MMX_CODE_SUPPORTED */
- #if !defined(PNG_1_0_X)
- /* pngget.c */
- extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
- PNGARG((int flag_select, int *compilerID));
- /* pngget.c */
- extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
- PNGARG((int flag_select));
- /* pngget.c */
- extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
- PNGARG((png_structp png_ptr));
- /* pngget.c */
- extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
- PNGARG((png_structp png_ptr));
- /* pngget.c */
- extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
- PNGARG((png_structp png_ptr));
- /* pngset.c */
- extern PNG_EXPORT(void,png_set_asm_flags)
- PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
- /* pngset.c */
- extern PNG_EXPORT(void,png_set_mmx_thresholds)
- PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
- png_uint_32 mmx_rowbytes_threshold));
- #endif /* PNG_1_0_X */
- #if !defined(PNG_1_0_X)
- /* png.c, pnggccrd.c, or pngvcrd.c */
- extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
- #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
- /* Strip the prepended error numbers ("#nnn ") from error and warning
- * messages before passing them to the error or warning handler. */
- #ifdef PNG_ERROR_NUMBERS_SUPPORTED
- extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
- png_ptr, png_uint_32 strip_mode));
- #endif
- #endif /* PNG_1_0_X */
- /* Added at libpng-1.2.6 */
- #ifdef PNG_SET_USER_LIMITS_SUPPORTED
- extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
- png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
- extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
- png_ptr));
- extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
- png_ptr));
- #endif
- /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
- #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
- /* With these routines we avoid an integer divide, which will be slower on
- * most machines. However, it does take more operations than the corresponding
- * divide method, so it may be slower on a few RISC systems. There are two
- * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
- *
- * Note that the rounding factors are NOT supposed to be the same! 128 and
- * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
- * standard method.
- *
- * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
- */
- /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
- # define png_composite(composite, fg, alpha, bg)
- { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha)
- + (png_uint_16)(bg)*(png_uint_16)(255 -
- (png_uint_16)(alpha)) + (png_uint_16)128);
- (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
- # define png_composite_16(composite, fg, alpha, bg)
- { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha)
- + (png_uint_32)(bg)*(png_uint_32)(65535L -
- (png_uint_32)(alpha)) + (png_uint_32)32768L);
- (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
- #else /* standard method using integer division */
- # define png_composite(composite, fg, alpha, bg)
- (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) +
- (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) +
- (png_uint_16)127) / 255)
- # define png_composite_16(composite, fg, alpha, bg)
- (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) +
- (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) +
- (png_uint_32)32767) / (png_uint_32)65535L)
- #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
- /* Inline macros to do direct reads of bytes from the input buffer. These
- * require that you are using an architecture that uses PNG byte ordering
- * (MSB first) and supports unaligned data storage. I think that PowerPC
- * in big-endian mode and 680x0 are the only ones that will support this.
- * The x86 line of processors definitely do not. The png_get_int_32()
- * routine also assumes we are using two's complement format for negative
- * values, which is almost certainly true.
- */
- #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
- # define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
- # define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
- # define png_get_int_32(buf) ( *((png_int_32p) (buf)))
- #else
- extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
- extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
- extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
- #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
- extern PNG_EXPORT(png_uint_32,png_get_uint_31)
- PNGARG((png_structp png_ptr, png_bytep buf));
- /* No png_get_int_16 -- may be added if there's a real need for it. */
- /* Place a 32-bit number into a buffer in PNG byte order (big-endian).
- */
- extern PNG_EXPORT(void,png_save_uint_32)
- PNGARG((png_bytep buf, png_uint_32 i));
- extern PNG_EXPORT(void,png_save_int_32)
- PNGARG((png_bytep buf, png_int_32 i));
- /* Place a 16-bit number into a buffer in PNG byte order.
- * The parameter is declared unsigned int, not png_uint_16,
- * just to avoid potential problems on pre-ANSI C compilers.
- */
- extern PNG_EXPORT(void,png_save_uint_16)
- PNGARG((png_bytep buf, unsigned int i));
- /* No png_save_int_16 -- may be added if there's a real need for it. */
- /* ************************************************************************* */
- /* These next functions are used internally in the code. They generally
- * shouldn't be used unless you are writing code to add or replace some
- * functionality in libpng. More information about most functions can
- * be found in the files where the functions are located.
- */
- /* Various modes of operation, that are visible to applications because
- * they are used for unknown chunk location.
- */
- #define PNG_HAVE_IHDR 0x01
- #define PNG_HAVE_PLTE 0x02
- #define PNG_HAVE_IDAT 0x04
- #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
- #define PNG_HAVE_IEND 0x10
- #if defined(PNG_INTERNAL)
- /* More modes of operation. Note that after an init, mode is set to
- * zero automatically when the structure is created.
- */
- #define PNG_HAVE_gAMA 0x20
- #define PNG_HAVE_cHRM 0x40
- #define PNG_HAVE_sRGB 0x80
- #define PNG_HAVE_CHUNK_HEADER 0x100
- #define PNG_WROTE_tIME 0x200
- #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
- #define PNG_BACKGROUND_IS_GRAY 0x800
- #define PNG_HAVE_PNG_SIGNATURE 0x1000
- #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
- /* flags for the transformations the PNG library does on the image data */
- #define PNG_BGR 0x0001
- #define PNG_INTERLACE 0x0002
- #define PNG_PACK 0x0004
- #define PNG_SHIFT 0x0008
- #define PNG_SWAP_BYTES 0x0010
- #define PNG_INVERT_MONO 0x0020
- #define PNG_DITHER 0x0040
- #define PNG_BACKGROUND 0x0080
- #define PNG_BACKGROUND_EXPAND 0x0100
- /* 0x0200 unused */
- #define PNG_16_TO_8 0x0400
- #define PNG_RGBA 0x0800
- #define PNG_EXPAND 0x1000
- #define PNG_GAMMA 0x2000
- #define PNG_GRAY_TO_RGB 0x4000
- #define PNG_FILLER 0x8000L
- #define PNG_PACKSWAP 0x10000L
- #define PNG_SWAP_ALPHA 0x20000L
- #define PNG_STRIP_ALPHA 0x40000L
- #define PNG_INVERT_ALPHA 0x80000L
- #define PNG_USER_TRANSFORM 0x100000L
- #define PNG_RGB_TO_GRAY_ERR 0x200000L
- #define PNG_RGB_TO_GRAY_WARN 0x400000L
- #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
- /* 0x800000L Unused */
- #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
- #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
- /* 0x4000000L unused */
- /* 0x8000000L unused */
- /* 0x10000000L unused */
- /* 0x20000000L unused */
- /* 0x40000000L unused */
- /* flags for png_create_struct */
- #define PNG_STRUCT_PNG 0x0001
- #define PNG_STRUCT_INFO 0x0002
- /* Scaling factor for filter heuristic weighting calculations */
- #define PNG_WEIGHT_SHIFT 8
- #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
- #define PNG_COST_SHIFT 3
- #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
- /* flags for the png_ptr->flags rather than declaring a byte for each one */
- #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
- #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
- #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
- #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
- #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
- #define PNG_FLAG_ZLIB_FINISHED 0x0020
- #define PNG_FLAG_ROW_INIT 0x0040
- #define PNG_FLAG_FILLER_AFTER 0x0080
- #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
- #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
- #define PNG_FLAG_CRC_CRITICAL_USE 0x0400
- #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
- #define PNG_FLAG_FREE_PLTE 0x1000
- #define PNG_FLAG_FREE_TRNS 0x2000
- #define PNG_FLAG_FREE_HIST 0x4000
- #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
- #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
- #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
- #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
- #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
- #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
- #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
- #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
- /* 0x800000L unused */
- /* 0x1000000L unused */
- /* 0x2000000L unused */
- /* 0x4000000L unused */
- /* 0x8000000L unused */
- /* 0x10000000L unused */
- /* 0x20000000L unused */
- /* 0x40000000L unused */
- #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE |
- PNG_FLAG_CRC_ANCILLARY_NOWARN)
- #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE |
- PNG_FLAG_CRC_CRITICAL_IGNORE)
- #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK |
- PNG_FLAG_CRC_CRITICAL_MASK)
- /* save typing and make code easier to understand */
- #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) +
- abs((int)((c1).green) - (int)((c2).green)) +
- abs((int)((c1).blue) - (int)((c2).blue)))
- /* Added to libpng-1.2.6 JB */
- #define PNG_ROWBYTES(pixel_bits, width)
- ((pixel_bits) >= 8 ?
- ((width) * (((png_uint_32)(pixel_bits)) >> 3)) :
- (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
- /* PNG_OUT_OF_RANGE returns true if value is outside the range
- ideal-delta..ideal+delta. Each argument is evaluated twice.
- "ideal" and "delta" should be constants, normally simple
- integers, "value" a variable. Added to libpng-1.2.6 JB */
- #define PNG_OUT_OF_RANGE(value, ideal, delta)
- ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
- /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
- #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
- /* place to hold the signature string for a PNG file. */
- #ifdef PNG_USE_GLOBAL_ARRAYS
- PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
- #else
- #endif
- #endif /* PNG_NO_EXTERN */
- /* Constant strings for known chunk types. If you need to add a chunk,
- * define the name here, and add an invocation of the macro in png.c and
- * wherever it's needed.
- */
- #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, ' '}
- #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, ' '}
- #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, ' '}
- #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, ' '}
- #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, ' '}
- #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, ' '}
- #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, ' '}
- #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, ' '}
- #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, ' '}
- #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, ' '}
- #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, ' '}
- #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, ' '}
- #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, ' '}
- #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, ' '}
- #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, ' '}
- #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, ' '}
- #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, ' '}
- #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, ' '}
- #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, ' '}
- #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, ' '}
- #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, ' '}
- #ifdef PNG_USE_GLOBAL_ARRAYS
- PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
- PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
- #endif /* PNG_USE_GLOBAL_ARRAYS */
- #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
- /* Initialize png_ptr struct for reading, and allocate any other memory.
- * (old interface - DEPRECATED - use png_create_read_struct instead).
- */
- extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
- #undef png_read_init
- #define png_read_init(png_ptr) png_read_init_3(&png_ptr,
- PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
- #endif
- extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
- png_const_charp user_png_ver, png_size_t png_struct_size));
- #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
- extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
- png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
- png_info_size));
- #endif
- #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
- /* Initialize png_ptr struct for writing, and allocate any other memory.
- * (old interface - DEPRECATED - use png_create_write_struct instead).
- */
- extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
- #undef png_write_init
- #define png_write_init(png_ptr) png_write_init_3(&png_ptr,
- PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
- #endif
- extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
- png_const_charp user_png_ver, png_size_t png_struct_size));
- extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
- png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
- png_info_size));
- /* Allocate memory for an internal libpng struct */
- PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
- /* Free memory from internal libpng struct */
- PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
- PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
- malloc_fn, png_voidp mem_ptr));
- PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
- png_free_ptr free_fn, png_voidp mem_ptr));
- /* Free any memory that info_ptr points to and reset struct. */
- PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- #ifndef PNG_1_0_X
- /* Function to allocate memory for zlib. */
- PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
- /* Function to free memory for zlib */
- PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
- #ifdef PNG_SIZE_T
- /* Function to convert a sizeof an item to png_sizeof item */
- PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
- #endif
- /* Next four functions are used internally as callbacks. PNGAPI is required
- * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
- PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
- png_bytep data, png_size_t length));
- #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
- PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
- png_bytep buffer, png_size_t length));
- #endif
- PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
- png_bytep data, png_size_t length));
- #if defined(PNG_WRITE_FLUSH_SUPPORTED)
- #if !defined(PNG_NO_STDIO)
- PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
- #endif
- #endif
- #else /* PNG_1_0_X */
- #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
- PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
- png_bytep buffer, png_size_t length));
- #endif
- #endif /* PNG_1_0_X */
- /* Reset the CRC variable */
- PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
- /* Write the "data" buffer to whatever output you are using. */
- PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
- png_size_t length));
- /* Read data from whatever input you are using into the "data" buffer */
- PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
- png_size_t length));
- /* Read bytes into buf, and update png_ptr->crc */
- PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
- png_size_t length));
- /* Decompress data in a chunk that uses compression */
- #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) ||
- defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
- PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
- int comp_type, png_size_t chunklength,
- png_size_t prefix_length, png_size_t *data_length));
- #endif
- /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
- PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
- /* Read the CRC from the file and compare it to the libpng calculated CRC */
- PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
- /* Calculate the CRC over a section of data. Note that we are only
- * passing a maximum of 64K on systems that have this as a memory limit,
- * since this is the maximum buffer size we can specify.
- */
- PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
- png_size_t length));
- #if defined(PNG_WRITE_FLUSH_SUPPORTED)
- PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
- #endif
- /* simple function to write the signature */
- PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
- /* write various chunks */
- /* Write the IHDR chunk, and update the png_struct with the necessary
- * information.
- */
- PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
- png_uint_32 height,
- int bit_depth, int color_type, int compression_method, int filter_method,
- int interlace_method));
- PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
- png_uint_32 num_pal));
- PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
- png_size_t length));
- PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
- #if defined(PNG_WRITE_gAMA_SUPPORTED)
- #ifdef PNG_FLOATING_POINT_SUPPORTED
- PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
- #endif
- #ifdef PNG_FIXED_POINT_SUPPORTED
- PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
- file_gamma));
- #endif
- #endif
- #if defined(PNG_WRITE_sBIT_SUPPORTED)
- PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
- int color_type));
- #endif
- #if defined(PNG_WRITE_cHRM_SUPPORTED)
- #ifdef PNG_FLOATING_POINT_SUPPORTED
- PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
- double white_x, double white_y,
- double red_x, double red_y, double green_x, double green_y,
- double blue_x, double blue_y));
- #endif
- #ifdef PNG_FIXED_POINT_SUPPORTED
- PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
- png_fixed_point int_white_x, png_fixed_point int_white_y,
- png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
- int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
- png_fixed_point int_blue_y));
- #endif
- #endif
- #if defined(PNG_WRITE_sRGB_SUPPORTED)
- PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
- int intent));
- #endif
- #if defined(PNG_WRITE_iCCP_SUPPORTED)
- PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
- png_charp name, int compression_type,
- png_charp profile, int proflen));
- /* Note to maintainer: profile should be png_bytep */
- #endif
- #if defined(PNG_WRITE_sPLT_SUPPORTED)
- PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
- png_sPLT_tp palette));
- #endif
- #if defined(PNG_WRITE_tRNS_SUPPORTED)
- PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
- png_color_16p values, int number, int color_type));
- #endif
- #if defined(PNG_WRITE_bKGD_SUPPORTED)
- PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
- png_color_16p values, int color_type));
- #endif
- #if defined(PNG_WRITE_hIST_SUPPORTED)
- PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
- int num_hist));
- #endif
- #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) ||
- defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
- PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
- png_charp key, png_charpp new_key));
- #endif
- #if defined(PNG_WRITE_tEXt_SUPPORTED)
- PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
- png_charp text, png_size_t text_len));
- #endif
- #if defined(PNG_WRITE_zTXt_SUPPORTED)
- PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
- png_charp text, png_size_t text_len, int compression));
- #endif
- #if defined(PNG_WRITE_iTXt_SUPPORTED)
- PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
- int compression, png_charp key, png_charp lang, png_charp lang_key,
- png_charp text));
- #endif
- #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
- PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_textp text_ptr, int num_text));
- #endif
- #if defined(PNG_WRITE_oFFs_SUPPORTED)
- PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
- png_int_32 x_offset, png_int_32 y_offset, int unit_type));
- #endif
- #if defined(PNG_WRITE_pCAL_SUPPORTED)
- PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
- png_int_32 X0, png_int_32 X1, int type, int nparams,
- png_charp units, png_charpp params));
- #endif
- #if defined(PNG_WRITE_pHYs_SUPPORTED)
- PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
- png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
- int unit_type));
- #endif
- #if defined(PNG_WRITE_tIME_SUPPORTED)
- PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
- png_timep mod_time));
- #endif
- #if defined(PNG_WRITE_sCAL_SUPPORTED)
- #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
- PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
- int unit, double width, double height));
- #else
- #ifdef PNG_FIXED_POINT_SUPPORTED
- PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
- int unit, png_charp width, png_charp height));
- #endif
- #endif
- #endif
- /* Called when finished processing a row of data */
- PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
- /* Internal use only. Called before first row of data */
- PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
- #if defined(PNG_READ_GAMMA_SUPPORTED)
- PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
- #endif
- /* combine a row of data, dealing with alpha, etc. if requested */
- PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
- int mask));
- #if defined(PNG_READ_INTERLACING_SUPPORTED)
- /* expand an interlaced row */
- /* OLD pre-1.0.9 interface:
- PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
- png_bytep row, int pass, png_uint_32 transformations));
- */
- PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
- #endif
- /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
- #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
- /* grab pixels out of a row for an interlaced pass */
- PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
- png_bytep row, int pass));
- #endif
- /* unfilter a row */
- PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
- png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
- /* Choose the best filter to use and filter the row data */
- PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
- png_row_infop row_info));
- /* Write out the filtered row. */
- PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
- png_bytep filtered_row));
- /* finish a row while reading, dealing with interlacing passes, etc. */
- PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
- /* initialize the row buffers, etc. */
- PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
- /* optional call to update the users info structure */
- PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- /* these are the functions that do the transformations */
- #if defined(PNG_READ_FILLER_SUPPORTED)
- PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
- png_bytep row, png_uint_32 filler, png_uint_32 flags));
- #endif
- #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
- PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
- png_bytep row));
- #endif
- #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
- PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
- png_bytep row));
- #endif
- #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
- PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
- png_bytep row));
- #endif
- #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
- PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
- png_bytep row));
- #endif
- #if defined(PNG_WRITE_FILLER_SUPPORTED) ||
- defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
- PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
- png_bytep row, png_uint_32 flags));
- #endif
- #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
- PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
- #endif
- #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
- PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
- #endif
- #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
- PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
- row_info, png_bytep row));
- #endif
- #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
- PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
- png_bytep row));
- #endif
- #if defined(PNG_READ_PACK_SUPPORTED)
- PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
- #endif
- #if defined(PNG_READ_SHIFT_SUPPORTED)
- PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
- png_color_8p sig_bits));
- #endif
- #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
- PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
- #endif
- #if defined(PNG_READ_16_TO_8_SUPPORTED)
- PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
- #endif
- #if defined(PNG_READ_DITHER_SUPPORTED)
- PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
- png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
- # if defined(PNG_CORRECT_PALETTE_SUPPORTED)
- PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
- png_colorp palette, int num_palette));
- # endif
- #endif
- #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
- PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
- #endif
- #if defined(PNG_WRITE_PACK_SUPPORTED)
- PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
- png_bytep row, png_uint_32 bit_depth));
- #endif
- #if defined(PNG_WRITE_SHIFT_SUPPORTED)
- PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
- png_color_8p bit_depth));
- #endif
- #if defined(PNG_READ_BACKGROUND_SUPPORTED)
- #if defined(PNG_READ_GAMMA_SUPPORTED)
- PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
- png_color_16p trans_values, png_color_16p background,
- png_color_16p background_1,
- png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
- png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
- png_uint_16pp gamma_16_to_1, int gamma_shift));
- #else
- PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
- png_color_16p trans_values, png_color_16p background));
- #endif
- #endif
- #if defined(PNG_READ_GAMMA_SUPPORTED)
- PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
- png_bytep gamma_table, png_uint_16pp gamma_16_table,
- int gamma_shift));
- #endif
- #if defined(PNG_READ_EXPAND_SUPPORTED)
- PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
- png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
- PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
- png_bytep row, png_color_16p trans_value));
- #endif
- /* The following decodes the appropriate chunks, and does error correction,
- * then calls the appropriate callback for the chunk if it is valid.
- */
- /* decode the IHDR chunk */
- PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #if defined(PNG_READ_bKGD_SUPPORTED)
- PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif
- #if defined(PNG_READ_cHRM_SUPPORTED)
- PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif
- #if defined(PNG_READ_gAMA_SUPPORTED)
- PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif
- #if defined(PNG_READ_hIST_SUPPORTED)
- PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif
- #if defined(PNG_READ_iCCP_SUPPORTED)
- extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif /* PNG_READ_iCCP_SUPPORTED */
- #if defined(PNG_READ_iTXt_SUPPORTED)
- PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif
- #if defined(PNG_READ_oFFs_SUPPORTED)
- PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif
- #if defined(PNG_READ_pCAL_SUPPORTED)
- PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif
- #if defined(PNG_READ_pHYs_SUPPORTED)
- PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif
- #if defined(PNG_READ_sBIT_SUPPORTED)
- PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif
- #if defined(PNG_READ_sCAL_SUPPORTED)
- PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif
- #if defined(PNG_READ_sPLT_SUPPORTED)
- extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif /* PNG_READ_sPLT_SUPPORTED */
- #if defined(PNG_READ_sRGB_SUPPORTED)
- PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif
- #if defined(PNG_READ_tEXt_SUPPORTED)
- PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif
- #if defined(PNG_READ_tIME_SUPPORTED)
- PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif
- #if defined(PNG_READ_tRNS_SUPPORTED)
- PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif
- #if defined(PNG_READ_zTXt_SUPPORTED)
- PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
- #endif
- PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_32 length));
- PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
- png_bytep chunk_name));
- /* handle the transformations for reading and writing */
- PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
- PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
- PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
- #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
- PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
- PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
- png_uint_32 length));
- PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
- PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
- PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
- png_bytep buffer, png_size_t buffer_length));
- PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
- PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
- png_bytep buffer, png_size_t buffer_length));
- PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
- PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_32 length));
- PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
- PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
- #if defined(PNG_READ_tEXt_SUPPORTED)
- PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_32 length));
- PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- #endif
- #if defined(PNG_READ_zTXt_SUPPORTED)
- PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_32 length));
- PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- #endif
- #if defined(PNG_READ_iTXt_SUPPORTED)
- PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_32 length));
- PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- #endif
- #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
- #ifdef PNG_MNG_FEATURES_SUPPORTED
- PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
- png_bytep row));
- PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
- png_bytep row));
- #endif
- #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
- #if defined(PNG_MMX_CODE_SUPPORTED)
- /* png.c */ /* PRIVATE */
- PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
- #endif
- #endif
- #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
- PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
- png_infop info_ptr));
- #if defined(PNG_pHYs_SUPPORTED)
- PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
- #endif /* PNG_pHYs_SUPPORTED */
- #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
- /* Read the chunk header (length + type name) */
- PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
- /* Added at libpng version 1.2.34 */
- #if defined(PNG_cHRM_SUPPORTED)
- PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
- png_fixed_point int_white_x, png_fixed_point int_white_y,
- png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
- int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
- png_fixed_point int_blue_y));
- #endif
- /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
- #endif /* PNG_INTERNAL */
- #ifdef __cplusplus
- }
- #endif
- #endif /* PNG_VERSION_INFO_ONLY */
- /* do not put anything past this line */
- #endif /* PNG_H */