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add VP8LAddPixels() to lossless.h

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Change-Id: I67f9118f875affa32c47adfedf9df28b0ac9957b
This commit is contained in:
Pascal Massimino
2016-05-10 19:34:04 +02:00
parent 4154a8395d
commit 47435a6162
2 changed files with 9 additions and 4 deletions
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9
src/dsp/lossless.h
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@ -329,7 +329,14 @@ static WEBP_INLINE void VP8LPrefixEncode(int distance, int* const code,
}
}
// In-place difference of each component with mod 256.
// Sum of each component, mod 256.
static WEBP_INLINE uint32_t VP8LAddPixels(uint32_t a, uint32_t b) {
const uint32_t alpha_and_green = (a & 0xff00ff00u) + (b & 0xff00ff00u);
const uint32_t red_and_blue = (a & 0x00ff00ffu) + (b & 0x00ff00ffu);
return (alpha_and_green & 0xff00ff00u) | (red_and_blue & 0x00ff00ffu);
}
// Difference of each component with mod 256.
static WEBP_INLINE uint32_t VP8LSubPixels(uint32_t a, uint32_t b) {
const uint32_t alpha_and_green =
0x00ff00ffu + (a & 0xff00ff00u) - (b & 0xff00ff00u);