Use the plane code and not the distance when computing statistics.
As backward references use the plane code when checking the cost of a distance, statistics used to compute the cost should use it too. This provides a small compression improvement at no speed cost. Change-Id: Icade150929ee39ef6dc0d8b1fc85973086ecf41d
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@ -58,13 +58,21 @@ static void ConvertPopulationCountTableToBitEstimates(
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}
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}
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}
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}
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static int CostModelBuild(CostModel* const m, int cache_bits,
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static int CostModelBuild(CostModel* const m, int xsize, int cache_bits,
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const VP8LBackwardRefs* const refs) {
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const VP8LBackwardRefs* const refs) {
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int ok = 0;
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int ok = 0;
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VP8LRefsCursor c = VP8LRefsCursorInit(refs);
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VP8LHistogram* const histo = VP8LAllocateHistogram(cache_bits);
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VP8LHistogram* const histo = VP8LAllocateHistogram(cache_bits);
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if (histo == NULL) goto Error;
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if (histo == NULL) goto Error;
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VP8LHistogramCreate(histo, refs, cache_bits);
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// The following code is similar to VP8LHistogramCreate but converts the
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// distance to plane code.
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VP8LHistogramInit(histo, cache_bits);
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while (VP8LRefsCursorOk(&c)) {
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VP8LHistogramAddSinglePixOrCopy(histo, c.cur_pos, VP8LDistanceToPlaneCode,
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xsize);
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VP8LRefsCursorNext(&c);
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}
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ConvertPopulationCountTableToBitEstimates(
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ConvertPopulationCountTableToBitEstimates(
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VP8LHistogramNumCodes(histo->palette_code_bits_),
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VP8LHistogramNumCodes(histo->palette_code_bits_),
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@ -583,7 +591,7 @@ static int BackwardReferencesHashChainDistanceOnly(
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if (!cc_init) goto Error;
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if (!cc_init) goto Error;
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}
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}
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if (!CostModelBuild(cost_model, cache_bits, refs)) {
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if (!CostModelBuild(cost_model, xsize, cache_bits, refs)) {
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goto Error;
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goto Error;
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}
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}
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@ -76,7 +76,7 @@ void VP8LHistogramStoreRefs(const VP8LBackwardRefs* const refs,
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VP8LHistogram* const histo) {
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VP8LHistogram* const histo) {
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VP8LRefsCursor c = VP8LRefsCursorInit(refs);
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VP8LRefsCursor c = VP8LRefsCursorInit(refs);
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while (VP8LRefsCursorOk(&c)) {
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while (VP8LRefsCursorOk(&c)) {
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VP8LHistogramAddSinglePixOrCopy(histo, c.cur_pos);
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VP8LHistogramAddSinglePixOrCopy(histo, c.cur_pos, NULL, 0);
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VP8LRefsCursorNext(&c);
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VP8LRefsCursorNext(&c);
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}
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}
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}
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}
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@ -138,7 +138,9 @@ VP8LHistogramSet* VP8LAllocateHistogramSet(int size, int cache_bits) {
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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void VP8LHistogramAddSinglePixOrCopy(VP8LHistogram* const histo,
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void VP8LHistogramAddSinglePixOrCopy(VP8LHistogram* const histo,
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const PixOrCopy* const v) {
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const PixOrCopy* const v,
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int (*const distance_modifier)(int, int),
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int distance_modifier_arg0) {
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if (PixOrCopyIsLiteral(v)) {
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if (PixOrCopyIsLiteral(v)) {
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++histo->alpha_[PixOrCopyLiteral(v, 3)];
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++histo->alpha_[PixOrCopyLiteral(v, 3)];
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++histo->red_[PixOrCopyLiteral(v, 2)];
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++histo->red_[PixOrCopyLiteral(v, 2)];
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@ -152,7 +154,13 @@ void VP8LHistogramAddSinglePixOrCopy(VP8LHistogram* const histo,
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int code, extra_bits;
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int code, extra_bits;
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VP8LPrefixEncodeBits(PixOrCopyLength(v), &code, &extra_bits);
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VP8LPrefixEncodeBits(PixOrCopyLength(v), &code, &extra_bits);
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++histo->literal_[NUM_LITERAL_CODES + code];
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++histo->literal_[NUM_LITERAL_CODES + code];
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if (distance_modifier == NULL) {
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VP8LPrefixEncodeBits(PixOrCopyDistance(v), &code, &extra_bits);
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VP8LPrefixEncodeBits(PixOrCopyDistance(v), &code, &extra_bits);
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} else {
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VP8LPrefixEncodeBits(
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distance_modifier(distance_modifier_arg0, PixOrCopyDistance(v)),
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&code, &extra_bits);
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}
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++histo->distance_[code];
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++histo->distance_[code];
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}
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}
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}
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}
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@ -473,7 +481,7 @@ static void HistogramBuild(
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while (VP8LRefsCursorOk(&c)) {
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while (VP8LRefsCursorOk(&c)) {
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const PixOrCopy* const v = c.cur_pos;
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const PixOrCopy* const v = c.cur_pos;
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const int ix = (y >> histo_bits) * histo_xsize + (x >> histo_bits);
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const int ix = (y >> histo_bits) * histo_xsize + (x >> histo_bits);
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VP8LHistogramAddSinglePixOrCopy(histograms[ix], v);
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VP8LHistogramAddSinglePixOrCopy(histograms[ix], v, NULL, 0);
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x += PixOrCopyLength(v);
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x += PixOrCopyLength(v);
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while (x >= xsize) {
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while (x >= xsize) {
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x -= xsize;
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x -= xsize;
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@ -90,7 +90,9 @@ VP8LHistogram* VP8LAllocateHistogram(int cache_bits);
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// Accumulate a token 'v' into a histogram.
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// Accumulate a token 'v' into a histogram.
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void VP8LHistogramAddSinglePixOrCopy(VP8LHistogram* const histo,
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void VP8LHistogramAddSinglePixOrCopy(VP8LHistogram* const histo,
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const PixOrCopy* const v);
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const PixOrCopy* const v,
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int (*const distance_modifier)(int, int),
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int distance_modifier_arg0);
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static WEBP_INLINE int VP8LHistogramNumCodes(int palette_code_bits) {
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static WEBP_INLINE int VP8LHistogramNumCodes(int palette_code_bits) {
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return NUM_LITERAL_CODES + NUM_LENGTH_CODES +
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return NUM_LITERAL_CODES + NUM_LENGTH_CODES +
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