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Pack code & extra_bits to Struct (VP8LPrefixCode).

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Also created variant VP8LPrefixEncodeBits that returns the
code & extra_bits only.
There's no impact on compression density and compression speed.

Change-Id: I2cafdd3438ac9270cd72ad9d57b383cdddfdfa4c
This commit is contained in:
Vikas Arora
2013-08-12 11:54:48 -07:00
parent f486aaa9f8
commit e081f2f359
4 changed files with 103 additions and 82 deletions
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8
src/enc/backward_references.c
View File

@ -462,15 +462,15 @@ static WEBP_INLINE double GetCacheCost(const CostModel* const m, uint32_t idx) {
static WEBP_INLINE double GetLengthCost(const CostModel* const m,
uint32_t length) {
int code, extra_bits, extra_bits_val;
VP8LPrefixEncode(length, &code, &extra_bits, &extra_bits_val);
int code, extra_bits;
VP8LPrefixEncodeBits(length, &code, &extra_bits);
return m->literal_[VALUES_IN_BYTE + code] + extra_bits;
}
static WEBP_INLINE double GetDistanceCost(const CostModel* const m,
uint32_t distance) {
int code, extra_bits, extra_bits_val;
VP8LPrefixEncode(distance, &code, &extra_bits, &extra_bits_val);
int code, extra_bits;
VP8LPrefixEncodeBits(distance, &code, &extra_bits);
return m->distance_[code] + extra_bits;
}

6
src/enc/histogram.c
View File

@ -90,10 +90,10 @@ void VP8LHistogramAddSinglePixOrCopy(VP8LHistogram* const histo,
int literal_ix = 256 + NUM_LENGTH_CODES + PixOrCopyCacheIdx(v);
++histo->literal_[literal_ix];
} else {
int code, extra_bits, extra_bits_val;
VP8LPrefixEncode(PixOrCopyLength(v), &code, &extra_bits, &extra_bits_val);
int code, extra_bits;
VP8LPrefixEncodeBits(PixOrCopyLength(v), &code, &extra_bits);
++histo->literal_[256 + code];
VP8LPrefixEncode(PixOrCopyDistance(v), &code, &extra_bits, &extra_bits_val);
VP8LPrefixEncodeBits(PixOrCopyDistance(v), &code, &extra_bits);
++histo->distance_[code];
}
}