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Henrik Rydgård
37 lines
1.3 KiB
C++
37 lines
1.3 KiB
C++
#pragma once
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#include <cstdint>
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#include "Common/BitSet.h"
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#include "Common/File/Path.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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bool pngSave(const Path &filename, const void *buffer, int w, int h, int bytesPerPixel);
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