mysimulation/Tools/iff2html/opngreduc.h
Andrew D'Addesio 227617b540 Moved to git
Assembla's decision to remove Trac incited us to ditch them entirely. Further, the repository no longer includes binaries or libraries; these can be downloaded from niotso.org/pub/ and updated with the included update-libraries script.
2012-10-17 03:21:00 -05:00

97 lines
3 KiB
C

/*
* opngreduc.h - libpng extension: lossless image reductions.
*
* Copyright (C) 2003-2011 Cosmin Truta.
* This software is distributed under the same licensing and warranty terms
* as libpng.
*
* This code is functional, although it is still work in progress.
* Upon completion, it will be submitted for incorporation into libpng.
*/
#ifndef OPNGREDUC_H
#define OPNGREDUC_H
#include <png.h>
#ifdef __cplusplus
extern "C" {
#endif
#ifdef PNG_INFO_IMAGE_SUPPORTED
/*
* Indicate whether the image information is valid, i.e.
* all the required critical information is present in the png structures.
*/
int PNGAPI opng_validate_image(png_structp png_ptr, png_infop info_ptr);
#endif /* PNG_INFO_IMAGE_SUPPORTED */
#ifndef OPNG_NO_IMAGE_REDUCTIONS
#define OPNG_IMAGE_REDUCTIONS_SUPPORTED
#endif
#ifdef OPNG_IMAGE_REDUCTIONS_SUPPORTED
#ifndef PNG_INFO_IMAGE_SUPPORTED
#error OPNG_IMAGE_REDUCTIONS_SUPPORTED requires PNG_INFO_IMAGE_SUPPORTED
#endif
#ifndef PNG_tRNS_SUPPORTED
#error OPNG_IMAGE_REDUCTIONS_SUPPORTED requires proper transparency support
#endif
/*
* Reduce the image (bit depth + color type + palette) without
* losing any information. The image data must be present
* (e.g. after calling png_set_rows(), or after loading IDAT).
*/
png_uint_32 PNGAPI opng_reduce_image(png_structp png_ptr, png_infop info_ptr,
png_uint_32 reductions);
/*
* PNG reduction flags.
*/
#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 0x0100 /* TODO: remove all sterile entries
and reorder PLTE */
#define OPNG_REDUCE_PALETTE_FAST 0x0200 /* remove trailing sterile entries
only; do not reorder PLTE */
#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 \
(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_PALETTE \
(OPNG_REDUCE_PALETTE_SLOW | OPNG_REDUCE_PALETTE_FAST)
#define OPNG_REDUCE_ALL \
(OPNG_REDUCE_BIT_DEPTH | OPNG_REDUCE_COLOR_TYPE | \
OPNG_REDUCE_PALETTE | OPNG_REDUCE_ANCILLARY)
#endif /* OPNG_IMAGE_REDUCTIONS_SUPPORTED */
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* OPNGREDUC_H */