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src/Source/LibPNG/pngpriv.h  view on Meta::CPAN

 *
 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
 *
 * The API always reads from the png_struct row buffer and always assumes that
 * it is full width (png_do_read_interlace has already been called.)
 *
 * This function is only ever used to write to row buffers provided by the
 * caller of the relevant libpng API and the row must have already been
 * transformed by the read transformations.
 *
 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
 * bitmasks for use within the code, otherwise runtime generated masks are used.
 * The default is compile time masks.
 */
#ifndef PNG_USE_COMPILE_TIME_MASKS
#  define PNG_USE_COMPILE_TIME_MASKS 1
#endif
PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
    png_bytep row, int display),PNG_EMPTY);

#ifdef PNG_READ_INTERLACING_SUPPORTED
/* Expand an interlaced row: the 'row_info' describes the pass data that has
 * been read in and must correspond to the pixels in 'row', the pixels are
 * expanded (moved apart) in 'row' to match the final layout, when doing this
 * the pixels are *replicated* to the intervening space.  This is essential for
 * the correct operation of png_combine_row, above.
 */
PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
    png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
#endif

/* GRR TO DO (2.0 or whenever):  simplify other internal calling interfaces */

#ifdef PNG_WRITE_INTERLACING_SUPPORTED
/* Grab pixels out of a row for an interlaced pass */
PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
    png_bytep row, int pass),PNG_EMPTY);
#endif

/* Unfilter a row: check the filter value before calling this, there is no point
 * calling it for PNG_FILTER_VALUE_NONE.
 */
PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop
    row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);

PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
    png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop
    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop
    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop
    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop
    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop
    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop
    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

/* Choose the best filter to use and filter the row data */
PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
    png_row_infop row_info),PNG_EMPTY);

#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
   png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
   /* Read 'avail_out' bytes of data from the IDAT stream.  If the output buffer
    * is NULL the function checks, instead, for the end of the stream.  In this
    * case a benign error will be issued if the stream end is not found or if
    * extra data has to be consumed.
    */
PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
   PNG_EMPTY);
   /* This cleans up when the IDAT LZ stream does not end when the last image
    * byte is read; there is still some pending input.
    */

PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
   PNG_EMPTY);
   /* Finish a row while reading, dealing with interlacing passes, etc. */
#endif /* SEQUENTIAL_READ */

/* Initialize the row buffers, etc. */
PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);

#ifdef PNG_READ_TRANSFORMS_SUPPORTED
/* Optional call to update the users info structure */
PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
    png_inforp info_ptr),PNG_EMPTY);
#endif

/* Shared transform functions, defined in pngtran.c */
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
    defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
    png_bytep row, int at_start),PNG_EMPTY);
#endif

#ifdef PNG_16BIT_SUPPORTED
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
    png_bytep row),PNG_EMPTY);
#endif
#endif

#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
    defined(PNG_WRITE_PACKSWAP_SUPPORTED)
PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
    png_bytep row),PNG_EMPTY);
#endif

#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
    png_bytep row),PNG_EMPTY);
#endif

#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
    png_bytep row),PNG_EMPTY);
#endif