third_party/libwebp/utils/random.h - Issue 421003002: libwebp: update to 0.4.1

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Unified Diff: third_party/libwebp/utils/random.h

Issue 421003002: libwebp: update to 0.4.1 (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: 0.4.1-final Created 6 years, 5 months ago

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Index: third_party/libwebp/utils/random.h

diff --git a/third_party/libwebp/utils/random.h b/third_party/libwebp/utils/random.h

index 08a83e9674ceab7802136d9d1ad2dd75bf11600a..c392a615caf947cdc9913bd92175e6b4ec38b118 100644

--- a/third_party/libwebp/utils/random.h

+++ b/third_party/libwebp/utils/random.h

@@ -45,7 +45,8 @@ static WEBP_INLINE int VP8RandomBits2(VP8Random* const rg, int num_bits,

rg->tab_[rg->index1_] = diff;

if (++rg->index1_ == VP8_RANDOM_TABLE_SIZE) rg->index1_ = 0;

if (++rg->index2_ == VP8_RANDOM_TABLE_SIZE) rg->index2_ = 0;

- diff = (diff << 1) >> (32 - num_bits); // sign-extend, 0-center

+ // sign-extend, 0-center

+ diff = (int)((uint32_t)diff << 1) >> (32 - num_bits);

diff = (diff * amp) >> VP8_RANDOM_DITHER_FIX; // restrict range

diff += 1 << (num_bits - 1); // shift back to 0.5-center

return diff;

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