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Avoid several backward reference copies.

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An extra VP8LBackwardRefs struct is used but it was used internally anyway.

Change-Id: Ifcb36ce42b8c21ef3c7a1daf38cb7f714687fcb2
This commit is contained in:
Vincent Rabaud 2017-04-13 16:52:38 +02:00
parent 4bb1f607d7
commit 690efd82f8
4 changed files with 62 additions and 80 deletions
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54
src/enc/backward_references_enc.c
View File

@ -173,21 +173,6 @@ static WEBP_INLINE void BackwardRefsCursorAdd(VP8LBackwardRefs* const refs,
b->start_[b->size_++] = v;
}
int VP8LBackwardRefsCopy(const VP8LBackwardRefs* const src,
VP8LBackwardRefs* const dst) {
const PixOrCopyBlock* b = src->refs_;
ClearBackwardRefs(dst);
assert(src->block_size_ == dst->block_size_);
while (b != NULL) {
PixOrCopyBlock* const new_b = BackwardRefsNewBlock(dst);
if (new_b == NULL) return 0; // dst->error_ is set
memcpy(new_b->start_, b->start_, b->size_ * sizeof(*b->start_));
new_b->size_ = b->size_;
b = b->next_;
}
return 1;
}
// -----------------------------------------------------------------------------
// Hash chains
@ -588,7 +573,7 @@ static void ConvertPopulationCountTableToBitEstimates(
}
static int CostModelBuild(CostModel* const m, int cache_bits,
VP8LBackwardRefs* const refs) {
const VP8LBackwardRefs* const refs) {
int ok = 0;
VP8LHistogram* const histo = VP8LAllocateHistogram(cache_bits);
if (histo == NULL) goto Error;
@ -1084,7 +1069,7 @@ static WEBP_INLINE void PushInterval(CostManager* const manager,
static int BackwardReferencesHashChainDistanceOnly(
int xsize, int ysize, const uint32_t* const argb, int cache_bits,
const VP8LHashChain* const hash_chain, VP8LBackwardRefs* const refs,
const VP8LHashChain* const hash_chain, const VP8LBackwardRefs* const refs,
uint16_t* const dist_array) {
int i;
int ok = 0;
@ -1279,7 +1264,8 @@ static int BackwardReferencesHashChainFollowChosenPath(
// Returns 1 on success.
static int BackwardReferencesTraceBackwards(
int xsize, int ysize, const uint32_t* const argb, int cache_bits,
const VP8LHashChain* const hash_chain, VP8LBackwardRefs* const refs) {
const VP8LHashChain* const hash_chain,
const VP8LBackwardRefs* const refs_src, VP8LBackwardRefs* const refs_dst) {
int ok = 0;
const int dist_array_size = xsize * ysize;
uint16_t* chosen_path = NULL;
@ -1289,13 +1275,14 @@ static int BackwardReferencesTraceBackwards(
if (dist_array == NULL) goto Error;
if (!BackwardReferencesHashChainDistanceOnly(xsize, ysize, argb, cache_bits,
hash_chain, refs, dist_array)) {
if (!BackwardReferencesHashChainDistanceOnly(
xsize, ysize, argb, cache_bits, hash_chain, refs_src, dist_array)) {
goto Error;
}
TraceBackwards(dist_array, dist_array_size, &chosen_path, &chosen_path_size);
if (!BackwardReferencesHashChainFollowChosenPath(
argb, cache_bits, chosen_path, chosen_path_size, hash_chain, refs)) {
argb, cache_bits, chosen_path, chosen_path_size, hash_chain,
refs_dst)) {
goto Error;
}
ok = 1;
@ -1458,8 +1445,7 @@ static int BackwardRefsWithLocalCache(const uint32_t* const argb,
static VP8LBackwardRefs* GetBackwardReferencesLowEffort(
int width, int height, const uint32_t* const argb,
int* const cache_bits, const VP8LHashChain* const hash_chain,
VP8LBackwardRefs refs_array[2]) {
VP8LBackwardRefs* refs_lz77 = &refs_array[0];
VP8LBackwardRefs* const refs_lz77) {
*cache_bits = 0;
if (!BackwardReferencesLz77(width, height, argb, 0, hash_chain, refs_lz77)) {
return NULL;
@ -1471,13 +1457,11 @@ static VP8LBackwardRefs* GetBackwardReferencesLowEffort(
static VP8LBackwardRefs* GetBackwardReferences(
int width, int height, const uint32_t* const argb, int quality,
int* const cache_bits, const VP8LHashChain* const hash_chain,
VP8LBackwardRefs refs_array[2]) {
VP8LBackwardRefs* const refs_lz77, VP8LBackwardRefs* const refs_rle) {
int lz77_is_useful;
int cache_bits_lz77 = *cache_bits, cache_bits_rle = *cache_bits;
double bit_cost_lz77, bit_cost_rle;
VP8LBackwardRefs* best = NULL;
VP8LBackwardRefs* refs_lz77 = &refs_array[0];
VP8LBackwardRefs* refs_rle = &refs_array[1];
VP8LHistogram* histo = NULL;
// Compute LZ77 with no cache (0 bits), as the ideal LZ77 with a color cache
@ -1531,19 +1515,14 @@ static VP8LBackwardRefs* GetBackwardReferences(
const int try_lz77_trace_backwards = (quality >= 25);
best = refs_lz77; // default guess: lz77 is better
if (try_lz77_trace_backwards) {
VP8LBackwardRefs* const refs_trace = refs_rle;
if (!VP8LBackwardRefsCopy(refs_lz77, refs_trace)) {
best = NULL;
goto Error;
}
if (BackwardReferencesTraceBackwards(width, height, argb, cache_bits_lz77,
hash_chain, refs_trace)) {
hash_chain, refs_lz77, refs_rle)) {
double bit_cost_trace;
// Evaluate LZ77 coding.
VP8LHistogramCreate(histo, refs_trace, cache_bits_lz77);
VP8LHistogramCreate(histo, refs_rle, cache_bits_lz77);
bit_cost_trace = VP8LHistogramEstimateBits(histo);
if (bit_cost_trace < bit_cost_lz77) {
best = refs_trace;
best = refs_rle;
}
}
}
@ -1563,12 +1542,13 @@ static VP8LBackwardRefs* GetBackwardReferences(
VP8LBackwardRefs* VP8LGetBackwardReferences(
int width, int height, const uint32_t* const argb, int quality,
int low_effort, int* const cache_bits,
const VP8LHashChain* const hash_chain, VP8LBackwardRefs refs_array[2]) {
const VP8LHashChain* const hash_chain, VP8LBackwardRefs* const refs_tmp1,
VP8LBackwardRefs* const refs_tmp2) {
if (low_effort) {
return GetBackwardReferencesLowEffort(width, height, argb, cache_bits,
hash_chain, refs_array);
hash_chain, refs_tmp1);
} else {
return GetBackwardReferences(width, height, argb, quality, cache_bits,
hash_chain, refs_array);
hash_chain, refs_tmp1, refs_tmp2);
}
}

6
src/enc/backward_references_enc.h
View File

@ -158,9 +158,6 @@ struct VP8LBackwardRefs {
void VP8LBackwardRefsInit(VP8LBackwardRefs* const refs, int block_size);
// Release memory for backward references.
void VP8LBackwardRefsClear(VP8LBackwardRefs* const refs);
// Copies the 'src' backward refs to the 'dst'. Returns 0 in case of error.
int VP8LBackwardRefsCopy(const VP8LBackwardRefs* const src,
VP8LBackwardRefs* const dst);
// Cursor for iterating on references content
typedef struct {
@ -198,7 +195,8 @@ static WEBP_INLINE void VP8LRefsCursorNext(VP8LRefsCursor* const c) {
VP8LBackwardRefs* VP8LGetBackwardReferences(
int width, int height, const uint32_t* const argb, int quality,
int low_effort, int* const cache_bits,
const VP8LHashChain* const hash_chain, VP8LBackwardRefs refs[2]);
const VP8LHashChain* const hash_chain, VP8LBackwardRefs* const refs_tmp1,
VP8LBackwardRefs* const refs_tmp2);
#ifdef __cplusplus
}

73
src/enc/vp8l_enc.c
View File

@ -364,6 +364,7 @@ static int AnalyzeAndInit(VP8LEncoder* const enc) {
// we round the block size up, so we're guaranteed to have
// at max MAX_REFS_BLOCK_PER_IMAGE blocks used:
int refs_block_size = (pix_cnt - 1) / MAX_REFS_BLOCK_PER_IMAGE + 1;
int i;
assert(pic != NULL && pic->argb != NULL);
enc->use_cross_color_ = 0;
@ -406,8 +407,7 @@ static int AnalyzeAndInit(VP8LEncoder* const enc) {
// palette-friendly input typically uses less literals
// -> reduce block size a bit
if (enc->use_palette_) refs_block_size /= 2;
VP8LBackwardRefsInit(&enc->refs_[0], refs_block_size);
VP8LBackwardRefsInit(&enc->refs_[1], refs_block_size);
for (i = 0; i < 3; ++i) VP8LBackwardRefsInit(&enc->refs_[i], refs_block_size);
return 1;
}
@ -676,7 +676,7 @@ static WEBP_INLINE void WriteHuffmanCodeWithExtraBits(
static WebPEncodingError StoreImageToBitMask(
VP8LBitWriter* const bw, int width, int histo_bits,
VP8LBackwardRefs* const refs,
const VP8LBackwardRefs* const refs,
const uint16_t* histogram_symbols,
const HuffmanTreeCode* const huffman_codes) {
const int histo_xsize = histo_bits ? VP8LSubSampleSize(width, histo_bits) : 1;
@ -739,7 +739,8 @@ static WebPEncodingError StoreImageToBitMask(
static WebPEncodingError EncodeImageNoHuffman(VP8LBitWriter* const bw,
const uint32_t* const argb,
VP8LHashChain* const hash_chain,
VP8LBackwardRefs refs_array[2],
VP8LBackwardRefs* const refs_tmp1,
VP8LBackwardRefs* const refs_tmp2,
int width, int height,
int quality, int low_effort) {
int i;
@ -765,7 +766,7 @@ static WebPEncodingError EncodeImageNoHuffman(VP8LBitWriter* const bw,
goto Error;
}
refs = VP8LGetBackwardReferences(width, height, argb, quality, 0, &cache_bits,
hash_chain, refs_array);
hash_chain, refs_tmp1, refs_tmp2);
if (refs == NULL) {
err = VP8_ENC_ERROR_OUT_OF_MEMORY;
goto Error;
@ -825,7 +826,7 @@ static WebPEncodingError EncodeImageNoHuffman(VP8LBitWriter* const bw,
static WebPEncodingError EncodeImageInternal(VP8LBitWriter* const bw,
const uint32_t* const argb,
VP8LHashChain* const hash_chain,
VP8LBackwardRefs refs_array[2],
VP8LBackwardRefs refs_array[3],
int width, int height, int quality,
int low_effort,
int use_cache, int* cache_bits,
@ -844,8 +845,8 @@ static WebPEncodingError EncodeImageInternal(VP8LBitWriter* const bw,
HuffmanTree* huff_tree = NULL;
HuffmanTreeToken* tokens = NULL;
HuffmanTreeCode* huffman_codes = NULL;
VP8LBackwardRefs refs;
VP8LBackwardRefs* best_refs;
VP8LBackwardRefs* refs_best;
VP8LBackwardRefs* refs_tmp;
uint16_t* const histogram_symbols =
(uint16_t*)WebPSafeMalloc(histogram_image_xysize,
sizeof(*histogram_symbols));
@ -854,7 +855,6 @@ static WebPEncodingError EncodeImageInternal(VP8LBitWriter* const bw,
assert(hdr_size != NULL);
assert(data_size != NULL);
VP8LBackwardRefsInit(&refs, refs_array[0].block_size_);
if (histogram_symbols == NULL) {
err = VP8_ENC_ERROR_OUT_OF_MEMORY;
goto Error;
@ -875,13 +875,17 @@ static WebPEncodingError EncodeImageInternal(VP8LBitWriter* const bw,
err = VP8_ENC_ERROR_OUT_OF_MEMORY;
goto Error;
}
best_refs = VP8LGetBackwardReferences(width, height, argb, quality,
refs_best = VP8LGetBackwardReferences(width, height, argb, quality,
low_effort, cache_bits, hash_chain,
refs_array);
if (best_refs == NULL || !VP8LBackwardRefsCopy(best_refs, &refs)) {
&refs_array[0], &refs_array[1]);
if (refs_best == NULL) {
err = VP8_ENC_ERROR_OUT_OF_MEMORY;
goto Error;
}
// Keep the best references aside and use the other element from the first two
// as a temporary for later usage.
refs_tmp = &refs_array[refs_best == &refs_array[0] ? 1 : 0];
histogram_image =
VP8LAllocateHistogramSet(histogram_image_xysize, *cache_bits);
tmp_histo = VP8LAllocateHistogram(*cache_bits);
@ -891,7 +895,7 @@ static WebPEncodingError EncodeImageInternal(VP8LBitWriter* const bw,
}
// Build histogram image and symbols from backward references.
if (!VP8LGetHistoImageSymbols(width, height, &refs, quality, low_effort,
if (!VP8LGetHistoImageSymbols(width, height, refs_best, quality, low_effort,
histogram_bits, *cache_bits, histogram_image,
tmp_histo, histogram_symbols)) {
err = VP8_ENC_ERROR_OUT_OF_MEMORY;
@ -949,10 +953,10 @@ static WebPEncodingError EncodeImageInternal(VP8LBitWriter* const bw,
histogram_image_size = max_index;
VP8LPutBits(bw, histogram_bits - 2, 3);
err = EncodeImageNoHuffman(bw, histogram_argb, hash_chain, refs_array,
err = EncodeImageNoHuffman(
bw, histogram_argb, hash_chain, refs_tmp, &refs_array[2],
VP8LSubSampleSize(width, histogram_bits),
VP8LSubSampleSize(height, histogram_bits),
quality, low_effort);
VP8LSubSampleSize(height, histogram_bits), quality, low_effort);
WebPSafeFree(histogram_argb);
if (err != VP8_ENC_OK) goto Error;
}
@ -990,7 +994,7 @@ static WebPEncodingError EncodeImageInternal(VP8LBitWriter* const bw,
*hdr_size = (int)(VP8LBitWriterNumBytes(bw) - init_byte_position);
// Store actual literals.
err = StoreImageToBitMask(bw, width, histogram_bits, &refs,
err = StoreImageToBitMask(bw, width, histogram_bits, refs_best,
histogram_symbols, huffman_codes);
*data_size =
(int)(VP8LBitWriterNumBytes(bw) - init_byte_position - *hdr_size);
@ -1000,7 +1004,6 @@ static WebPEncodingError EncodeImageInternal(VP8LBitWriter* const bw,
WebPSafeFree(huff_tree);
VP8LFreeHistogramSet(histogram_image);
VP8LFreeHistogram(tmp_histo);
VP8LBackwardRefsClear(&refs);
if (huffman_codes != NULL) {
WebPSafeFree(huffman_codes->codes);
WebPSafeFree(huffman_codes);
@ -1039,10 +1042,10 @@ static WebPEncodingError ApplyPredictFilter(const VP8LEncoder* const enc,
VP8LPutBits(bw, PREDICTOR_TRANSFORM, 2);
assert(pred_bits >= 2);
VP8LPutBits(bw, pred_bits - 2, 3);
return EncodeImageNoHuffman(bw, enc->transform_data_,
(VP8LHashChain*)&enc->hash_chain_,
(VP8LBackwardRefs*)enc->refs_, // cast const away
transform_width, transform_height,
return EncodeImageNoHuffman(
bw, enc->transform_data_, (VP8LHashChain*)&enc->hash_chain_,
(VP8LBackwardRefs*)&enc->refs_[0], // cast const away
(VP8LBackwardRefs*)&enc->refs_[1], transform_width, transform_height,
quality, low_effort);
}
@ -1060,10 +1063,10 @@ static WebPEncodingError ApplyCrossColorFilter(const VP8LEncoder* const enc,
VP8LPutBits(bw, CROSS_COLOR_TRANSFORM, 2);
assert(ccolor_transform_bits >= 2);
VP8LPutBits(bw, ccolor_transform_bits - 2, 3);
return EncodeImageNoHuffman(bw, enc->transform_data_,
(VP8LHashChain*)&enc->hash_chain_,
(VP8LBackwardRefs*)enc->refs_, // cast const away
transform_width, transform_height,
return EncodeImageNoHuffman(
bw, enc->transform_data_, (VP8LHashChain*)&enc->hash_chain_,
(VP8LBackwardRefs*)&enc->refs_[0], // cast const away
(VP8LBackwardRefs*)&enc->refs_[1], transform_width, transform_height,
quality, low_effort);
}
@ -1398,8 +1401,9 @@ static WebPEncodingError EncodePalette(VP8LBitWriter* const bw, int low_effort,
tmp_palette[i] = VP8LSubPixels(palette[i], palette[i - 1]);
}
tmp_palette[0] = palette[0];
return EncodeImageNoHuffman(bw, tmp_palette, &enc->hash_chain_, enc->refs_,
palette_size, 1, 20 /* quality */, low_effort);
return EncodeImageNoHuffman(bw, tmp_palette, &enc->hash_chain_,
&enc->refs_[0], &enc->refs_[1], palette_size, 1,
20 /* quality */, low_effort);
}
#ifdef WEBP_EXPERIMENTAL_FEATURES
@ -1434,10 +1438,11 @@ static WebPEncodingError EncodeDeltaPalettePredictorImage(
VP8LPutBits(bw, TRANSFORM_PRESENT, 1);
VP8LPutBits(bw, PREDICTOR_TRANSFORM, 2);
VP8LPutBits(bw, pred_bits - 2, 3);
err = EncodeImageNoHuffman(bw, predictors, &enc->hash_chain_,
(VP8LBackwardRefs*)enc->refs_, // cast const away
transform_width, transform_height,
quality, low_effort);
err = EncodeImageNoHuffman(
bw, predictors, &enc->hash_chain_,
(VP8LBackwardRefs*)&enc->refs_[0], // cast const away
(VP8LBackwardRefs*)&enc->refs_[1], // cast const away
transform_width, transform_height, quality, low_effort);
WebPSafeFree(predictors);
return err;
}
@ -1464,9 +1469,9 @@ static VP8LEncoder* VP8LEncoderNew(const WebPConfig* const config,
static void VP8LEncoderDelete(VP8LEncoder* enc) {
if (enc != NULL) {
int i;
VP8LHashChainClear(&enc->hash_chain_);
VP8LBackwardRefsClear(&enc->refs_[0]);
VP8LBackwardRefsClear(&enc->refs_[1]);
for (i = 0; i < 3; ++i) VP8LBackwardRefsClear(&enc->refs_[i]);
ClearTransformBuffer(enc);
WebPSafeFree(enc);
}

3
src/enc/vp8li_enc.h
View File

@ -54,8 +54,7 @@ typedef struct {
uint32_t palette_[MAX_PALETTE_SIZE];
// Some 'scratch' (potentially large) objects.
struct VP8LBackwardRefs refs_[2]; // Backward Refs array corresponding to
// LZ77 & RLE coding.
struct VP8LBackwardRefs refs_[3]; // Backward Refs array for temporaries.
VP8LHashChain hash_chain_; // HashChain data for constructing
// backward references.
} VP8LEncoder;