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GitHub Repository: hrydgard/ppsspp
 Path: blob/master/Common/Data/Format/PNGLoad.h
Views: 1401
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#pragma once

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#include <cstdint>

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#include "Common/BitSet.h"

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// *image_data_ptr should be deleted with free()

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// return value of 1 == success.

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int pngLoad(const char *file, int *pwidth, 

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            int *pheight, unsigned char **image_data_ptr);

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int pngLoadPtr(const unsigned  char *input_ptr, size_t input_len, int *pwidth,

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            int *pheight, unsigned char **image_data_ptr);

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// PNG peeker - just read the start of a PNG straight into this struct, in order to

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// look at basic parameters like width and height. Note that while PNG is a chunk-based

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// format, the IHDR chunk is REQUIRED to be the first one, so this will work.

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// Does not handle Apple's weirdo extension CgBI. http://iphonedevwiki.net/index.php/CgBI_file_format

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// That should not be an issue.

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struct PNGHeaderPeek {

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	uint32_t magic;

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	uint32_t ignore0;

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	uint32_t ignore1;

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	uint32_t ihdrTag;

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	uint32_t be_width;  // big endian

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	uint32_t be_height;

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	uint8_t bitDepth;   // bits per channel, can be 1, 2, 4, 8, 16

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	uint8_t colorType;  // really, pixel format. 0 = grayscale, 2 = rgb, 3 = palette index, 4 = gray+alpha, 6 = rgba

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	bool IsValidPNGHeader() const;

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	int Width() const { return swap32(be_width); }

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	int Height() const { return swap32(be_height); }

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};

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