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227617b540
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.
97 lines
3 KiB
C
97 lines
3 KiB
C
/*
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* opngreduc.h - libpng extension: lossless image reductions.
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*
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* Copyright (C) 2003-2011 Cosmin Truta.
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* This software is distributed under the same licensing and warranty terms
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* as libpng.
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*
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* This code is functional, although it is still work in progress.
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* Upon completion, it will be submitted for incorporation into libpng.
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*/
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#ifndef OPNGREDUC_H
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#define OPNGREDUC_H
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#include <png.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef PNG_INFO_IMAGE_SUPPORTED
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/*
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* Indicate whether the image information is valid, i.e.
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* all the required critical information is present in the png structures.
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*/
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int PNGAPI opng_validate_image(png_structp png_ptr, png_infop info_ptr);
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#endif /* PNG_INFO_IMAGE_SUPPORTED */
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#ifndef OPNG_NO_IMAGE_REDUCTIONS
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#define OPNG_IMAGE_REDUCTIONS_SUPPORTED
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#endif
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#ifdef OPNG_IMAGE_REDUCTIONS_SUPPORTED
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#ifndef PNG_INFO_IMAGE_SUPPORTED
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#error OPNG_IMAGE_REDUCTIONS_SUPPORTED requires PNG_INFO_IMAGE_SUPPORTED
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#endif
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#ifndef PNG_tRNS_SUPPORTED
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#error OPNG_IMAGE_REDUCTIONS_SUPPORTED requires proper transparency support
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#endif
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/*
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* Reduce the image (bit depth + color type + palette) without
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* losing any information. The image data must be present
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* (e.g. after calling png_set_rows(), or after loading IDAT).
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*/
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png_uint_32 PNGAPI opng_reduce_image(png_structp png_ptr, png_infop info_ptr,
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png_uint_32 reductions);
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/*
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* PNG reduction flags.
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*/
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#define OPNG_REDUCE_NONE 0x0000
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#define OPNG_REDUCE_16_TO_8 0x0001 /* discard bits 8-15 */
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#define OPNG_REDUCE_8_TO_4_2_1 0x0002 /* discard bits 4-7, 2-7 or 1-7 */
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#define OPNG_REDUCE_RGB_TO_GRAY 0x0004 /* ...also RGBA to GA */
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#define OPNG_REDUCE_STRIP_ALPHA 0x0008 /* ...and create tRNS if needed */
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#define OPNG_REDUCE_RGB_TO_PALETTE 0x0010 /* ...also RGBA to palette/tRNS */
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#define OPNG_REDUCE_PALETTE_TO_RGB 0x0020 /* TODO */
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#define OPNG_REDUCE_GRAY_TO_PALETTE 0x0040 /* ...also GA to palette/tRNS */
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#define OPNG_REDUCE_PALETTE_TO_GRAY 0x0080 /* ...also palette/tRNS to GA */
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#define OPNG_REDUCE_PALETTE_SLOW 0x0100 /* TODO: remove all sterile entries
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and reorder PLTE */
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#define OPNG_REDUCE_PALETTE_FAST 0x0200 /* remove trailing sterile entries
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only; do not reorder PLTE */
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#define OPNG_REDUCE_ANCILLARY 0x1000 /* TODO */
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#define OPNG_REDUCE_BIT_DEPTH \
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(OPNG_REDUCE_16_TO_8 | OPNG_REDUCE_8_TO_4_2_1)
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#define OPNG_REDUCE_COLOR_TYPE \
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(OPNG_REDUCE_RGB_TO_GRAY | OPNG_REDUCE_STRIP_ALPHA | \
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OPNG_REDUCE_RGB_TO_PALETTE | OPNG_REDUCE_PALETTE_TO_RGB | \
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OPNG_REDUCE_GRAY_TO_PALETTE | OPNG_REDUCE_PALETTE_TO_GRAY)
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#define OPNG_REDUCE_PALETTE \
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(OPNG_REDUCE_PALETTE_SLOW | OPNG_REDUCE_PALETTE_FAST)
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#define OPNG_REDUCE_ALL \
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(OPNG_REDUCE_BIT_DEPTH | OPNG_REDUCE_COLOR_TYPE | \
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OPNG_REDUCE_PALETTE | OPNG_REDUCE_ANCILLARY)
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#endif /* OPNG_IMAGE_REDUCTIONS_SUPPORTED */
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* OPNGREDUC_H */
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