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Have the color cache computation be u32-bit only.

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BUG=webp:412

Change-Id: I18a3acb1b7f5d64f538b5c27521bc9e8dd599f5e
This commit is contained in:
Vincent Rabaud 2019-01-22 10:04:51 +01:00
parent 6bcf876980
commit 7d05d6ca91
2 changed files with 6 additions and 6 deletions
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8
src/enc/backward_references_enc.c
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@ -191,13 +191,13 @@ void VP8LHashChainClear(VP8LHashChain* const p) {
// -----------------------------------------------------------------------------
#define HASH_MULTIPLIER_HI (0xc6a4a793ULL)
#define HASH_MULTIPLIER_LO (0x5bd1e996ULL)
static const uint32_t kHashMultiplierHi = 0xc6a4a793u;
static const uint32_t kHashMultiplierLo = 0x5bd1e996u;
static WEBP_INLINE uint32_t GetPixPairHash64(const uint32_t* const argb) {
uint32_t key;
key = (argb[1] * HASH_MULTIPLIER_HI) & 0xffffffffu;
key += (argb[0] * HASH_MULTIPLIER_LO) & 0xffffffffu;
key = argb[1] * kHashMultiplierHi;
key += argb[0] * kHashMultiplierLo;
key = key >> (32 - HASH_BITS);
return key;
}

4
src/utils/color_cache_utils.h
View File

@ -30,10 +30,10 @@ typedef struct {
int hash_bits_;
} VP8LColorCache;
static const uint64_t kHashMul = 0x1e35a7bdull;
static const uint32_t kHashMul = 0x1e35a7bdu;
static WEBP_INLINE int VP8LHashPix(uint32_t argb, int shift) {
return (int)(((argb * kHashMul) & 0xffffffffu) >> shift);
return (int)((argb * kHashMul) >> shift);
}
static WEBP_INLINE uint32_t VP8LColorCacheLookup(