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MIPS: MIPS32r1: Added optimizations for ExtraCost functions.

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ExtraCost and ExtraCostCombined

Change-Id: I7eceb9ce2807296c6b43b974e4216879ddcd79f2
This commit is contained in:
Djordje Pesut
2014-04-15 12:55:20 +02:00
committed by skal
parent a8fe8ce231
commit 4ae0533f39
4 changed files with 144 additions and 28 deletions
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12
src/dsp/lossless.h
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@ -118,6 +118,7 @@ static WEBP_INLINE uint32_t VP8LSubSampleSize(uint32_t size,
return (size + (1 << sampling_bits) - 1) >> sampling_bits;
}
// -----------------------------------------------------------------------------
// Faster logarithm for integers. Small values use a look-up table.
#define LOG_LOOKUP_IDX_MAX 256
extern const float kLog2Table[LOG_LOOKUP_IDX_MAX];
@ -135,6 +136,17 @@ static WEBP_INLINE float VP8LFastSLog2(int v) {
return (v < LOG_LOOKUP_IDX_MAX) ? kSLog2Table[v] : VP8LFastSLog2Slow(v);
}
// -----------------------------------------------------------------------------
// Huffman-cost related functions.
typedef double (*VP8LCostFunc)(const int* const population, int length);
typedef double (*VP8LCostCombinedFunc)(const int* const X,
const int* const Y,
int length);
extern VP8LCostFunc VP8LExtraCost;
extern VP8LCostCombinedFunc VP8LExtraCostCombined;
// -----------------------------------------------------------------------------
// PrefixEncode()