RGB15 actually reads data as XBGR (XBBBBBGGGGGRRRRR).
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void |
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ImagingUnpackRGB15(UINT8 *out, const UINT8 *in, int pixels) { |
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int i, pixel; |
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/* RGB, 5 bits per pixel */ |
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for (i = 0; i < pixels; i++) { |
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pixel = in[0] + (in[1] << 8); |
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out[R] = (pixel & 31) * 255 / 31; |
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out[G] = ((pixel >> 5) & 31) * 255 / 31; |
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out[B] = ((pixel >> 10) & 31) * 255 / 31; |
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out[A] = 255; |
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out += 4; |
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in += 2; |
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} |
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} |
RGBA15 actually reads data as ABGR (ABBBBBGGGGGRRRRR).
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void |
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ImagingUnpackRGBA15(UINT8 *out, const UINT8 *in, int pixels) { |
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int i, pixel; |
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/* RGB, 5/5/5/1 bits per pixel */ |
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for (i = 0; i < pixels; i++) { |
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pixel = in[0] + (in[1] << 8); |
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out[R] = (pixel & 31) * 255 / 31; |
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out[G] = ((pixel >> 5) & 31) * 255 / 31; |
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out[B] = ((pixel >> 10) & 31) * 255 / 31; |
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out[A] = (pixel >> 15) * 255; |
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out += 4; |
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in += 2; |
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} |
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} |
RGBA4B actually reads data as ABGR (AAAABBBBGGGGRRRR).
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void |
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ImagingUnpackRGBA4B(UINT8 *out, const UINT8 *in, int pixels) { |
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int i, pixel; |
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/* RGBA, 4 bits per pixel */ |
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for (i = 0; i < pixels; i++) { |
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pixel = in[0] + (in[1] << 8); |
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out[R] = (pixel & 15) * 17; |
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out[G] = ((pixel >> 4) & 15) * 17; |
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out[B] = ((pixel >> 8) & 15) * 17; |
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out[A] = ((pixel >> 12) & 15) * 17; |
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out += 4; |
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in += 2; |
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} |
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} |
etc.
Basically, all of the unpackers that read less than 8 bits per band appear to be backwards.
