19 lines
423 B
C++
19 lines
423 B
C++
#include "precomp_wasabi_bfc.h"
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#include "std_math.h"
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void premultiplyARGB32(ARGB32 *words, int nwords)
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{
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for (; nwords > 0; nwords--, words++)
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{
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unsigned char *pixel = (unsigned char *)words;
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unsigned int alpha = pixel[3];
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if (alpha == 255) continue;
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pixel[0] = (pixel[0] * alpha) >> 8; // blue
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pixel[1] = (pixel[1] * alpha) >> 8; // green
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pixel[2] = (pixel[2] * alpha) >> 8; // red
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}
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}
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