94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
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/**********************************************************
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* Copyright 2008-2009 VMware, Inc. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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**********************************************************/
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/*
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* png.h --
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*
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* An extremely simple library for reading in-memory PNG images.
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*
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* This library has no validation at all, so it must be used only
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* with images from trusted sources.
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*/
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#ifndef __PNG_H__
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#define __PNG_H__
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#include "types.h"
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/*
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* PNG fields are in Big Endian byte order. Define a new data type
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* for Big Endian numbers, and an inline function to do 32-bit byte
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* swapping.
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*/
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typedef uint32 be32;
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static inline uint32
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bswap32(uint32 x)
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{
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__asm__ ("bswap %0" : "+r" (x));
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return x;
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}
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/*
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* PNG data types
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*/
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typedef struct {
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be32 length;
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uint32 type;
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uint8 data[0];
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} PNGChunk;
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typedef struct {
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PNGChunk hdr;
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be32 width;
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be32 height;
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uint8 bitDepth;
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uint8 colorType;
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uint8 compression;
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uint8 filter;
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uint8 interlace;
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} PNGChunkIHDR;
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#define PNG_CHUNK(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((d) << 24))
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#define PNG_IHDR PNG_CHUNK('I','H','D','R')
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#define PNG_IDAT PNG_CHUNK('I','D','A','T')
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#define PNG_IEND PNG_CHUNK('I','E','N','D')
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/*
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* Public functions
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*/
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PNGChunkIHDR *PNG_Header(void *pngData);
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PNGChunk *PNG_NextChunk(PNGChunk *lastChunk);
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void PNG_DecompressBGRX(PNGChunkIHDR *ihdr, uint32 *framebuffer, uint32 pitch);
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#endif /* __PNG_H_ */
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