opngreduc.h File Reference

#include <png.h>

Go to the source code of this file.

Macros
#define	OPNG_IMAGE_REDUCTIONS_SUPPORTED
#define	OPNG_REDUCE_NONE   0x0000
#define	OPNG_REDUCE_16_TO_8   0x0001 /* discard bits 8-15 */
#define	OPNG_REDUCE_8_TO_4_2_1   0x0002 /* discard bits 4-7, 2-7 or 1-7 */
#define	OPNG_REDUCE_RGB_TO_GRAY   0x0004 /* ...also RGBA to GA */
#define	OPNG_REDUCE_STRIP_ALPHA   0x0008 /* ...and create tRNS if needed */
#define	OPNG_REDUCE_RGB_TO_PALETTE   0x0010 /* ...also RGBA to palette/tRNS */
#define	OPNG_REDUCE_PALETTE_TO_RGB   0x0020 /* TODO */
#define	OPNG_REDUCE_GRAY_TO_PALETTE   0x0040 /* ...also GA to palette/tRNS */
#define	OPNG_REDUCE_PALETTE_TO_GRAY   0x0080 /* ...also palette/tRNS to GA */
#define	OPNG_REDUCE_PALETTE_SLOW
#define	OPNG_REDUCE_PALETTE_FAST
#define	OPNG_REDUCE_ANCILLARY   0x1000 /* TODO */
#define	OPNG_REDUCE_BIT_DEPTH   (OPNG_REDUCE_16_TO_8 | OPNG_REDUCE_8_TO_4_2_1)
#define	OPNG_REDUCE_COLOR_TYPE
#define	OPNG_REDUCE_PALETTE   (OPNG_REDUCE_PALETTE_SLOW | OPNG_REDUCE_PALETTE_FAST)
#define	OPNG_REDUCE_ALL

Functions
png_uint_32 PNGAPI	opng_reduce_image (png_structp png_ptr, png_infop info_ptr, png_uint_32 reductions)

Macro Definition Documentation

#define OPNG_IMAGE_REDUCTIONS_SUPPORTED

#define OPNG_REDUCE_16_TO_8   0x0001 /* discard bits 8-15 */

#define OPNG_REDUCE_8_TO_4_2_1   0x0002 /* discard bits 4-7, 2-7 or 1-7 */

#define OPNG_REDUCE_ALL

Value:

(OPNG_REDUCE_BIT_DEPTH | OPNG_REDUCE_COLOR_TYPE | \
    OPNG_REDUCE_PALETTE | OPNG_REDUCE_ANCILLARY)

#define OPNG_REDUCE_ANCILLARY   0x1000 /* TODO */

#define OPNG_REDUCE_BIT_DEPTH   (OPNG_REDUCE_16_TO_8 | OPNG_REDUCE_8_TO_4_2_1)

#define OPNG_REDUCE_COLOR_TYPE

Value:

(OPNG_REDUCE_RGB_TO_GRAY | OPNG_REDUCE_STRIP_ALPHA | \
    OPNG_REDUCE_RGB_TO_PALETTE | OPNG_REDUCE_PALETTE_TO_RGB | \
    OPNG_REDUCE_GRAY_TO_PALETTE | OPNG_REDUCE_PALETTE_TO_GRAY)

#define OPNG_REDUCE_GRAY_TO_PALETTE   0x0040 /* ...also GA to palette/tRNS */

#define OPNG_REDUCE_NONE   0x0000

#define OPNG_REDUCE_PALETTE   (OPNG_REDUCE_PALETTE_SLOW | OPNG_REDUCE_PALETTE_FAST)

#define OPNG_REDUCE_PALETTE_FAST

Value:

0x0200  /* remove trailing sterile entries
                                                only; do not reorder PLTE */

#define OPNG_REDUCE_PALETTE_SLOW

Value:

0x0100  /* TODO: remove all sterile entries
                                                and reorder PLTE */

#define OPNG_REDUCE_PALETTE_TO_GRAY   0x0080 /* ...also palette/tRNS to GA */

#define OPNG_REDUCE_PALETTE_TO_RGB   0x0020 /* TODO */

#define OPNG_REDUCE_RGB_TO_GRAY   0x0004 /* ...also RGBA to GA */

#define OPNG_REDUCE_RGB_TO_PALETTE   0x0010 /* ...also RGBA to palette/tRNS */

#define OPNG_REDUCE_STRIP_ALPHA   0x0008 /* ...and create tRNS if needed */

Function Documentation

png_uint_32 PNGAPI opng_reduce_image	(	png_structp	png_ptr,
		png_infop	info_ptr,
		png_uint_32	reductions
	)