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make HistogramAdd() a pointer in dsp

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* merged the two HistogramAdd/AddEval() into a single call
  (with detection of special case when b==out)
* added a SSE2 variant
* harmonize the histogram type to 'uint32_t' instead
  of just 'int'. This has a lot of ripples on signatures.
* 1-2% faster

Change-Id: I10299ff300f36cdbca5a560df1ae4d4df149d306
This commit is contained in:
Pascal Massimino 2014-04-28 02:11:46 -07:00 committed by skal
parent c8bbb636ea
commit b3a616b356
10 changed files with 230 additions and 124 deletions
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65
src/dsp/lossless.c
View File

@ -332,14 +332,14 @@ const uint8_t kPrefixEncodeExtraBitsValue[PREFIX_LOOKUP_IDX_MAX] = {
#define APPROX_LOG_WITH_CORRECTION_MAX 65536
#define APPROX_LOG_MAX 4096
#define LOG_2_RECIPROCAL 1.44269504088896338700465094007086
static float FastSLog2Slow(int v) {
static float FastSLog2Slow(uint32_t v) {
assert(v >= LOG_LOOKUP_IDX_MAX);
if (v < APPROX_LOG_WITH_CORRECTION_MAX) {
int log_cnt = 0;
int y = 1;
uint32_t y = 1;
int correction = 0;
const float v_f = (float)v;
const int orig_v = v;
const uint32_t orig_v = v;
do {
++log_cnt;
v = v >> 1;
@ -358,12 +358,12 @@ static float FastSLog2Slow(int v) {
}
}
static float FastLog2Slow(int v) {
static float FastLog2Slow(uint32_t v) {
assert(v >= LOG_LOOKUP_IDX_MAX);
if (v < APPROX_LOG_WITH_CORRECTION_MAX) {
int log_cnt = 0;
int y = 1;
const int orig_v = v;
uint32_t y = 1;
const uint32_t orig_v = v;
double log_2;
do {
++log_cnt;
@ -1437,6 +1437,7 @@ void VP8LConvertFromBGRA(const uint32_t* const in_data, int num_pixels,
}
}
//------------------------------------------------------------------------------
// Bundles multiple (1, 2, 4 or 8) pixels into a single pixel.
void VP8LBundleColorMap(const uint8_t* const row, int width,
int xbits, uint32_t* const dst) {
@ -1458,14 +1459,17 @@ void VP8LBundleColorMap(const uint8_t* const row, int width,
}
}
static double ExtraCost(const int* population, int length) {
//------------------------------------------------------------------------------
static double ExtraCost(const uint32_t* population, int length) {
int i;
double cost = 0.;
for (i = 2; i < length - 2; ++i) cost += (i >> 1) * population[i + 2];
return cost;
}
static double ExtraCostCombined(const int* X, const int* Y, int length) {
static double ExtraCostCombined(const uint32_t* X, const uint32_t* Y,
int length) {
int i;
double cost = 0.;
for (i = 2; i < length - 2; ++i) {
@ -1476,7 +1480,7 @@ static double ExtraCostCombined(const int* X, const int* Y, int length) {
}
// Returns the various RLE counts
static VP8LStreaks HuffmanCostCount(const int* population, int length) {
static VP8LStreaks HuffmanCostCount(const uint32_t* population, int length) {
int i;
int streak = 0;
VP8LStreaks stats;
@ -1496,8 +1500,8 @@ static VP8LStreaks HuffmanCostCount(const int* population, int length) {
return stats;
}
static VP8LStreaks HuffmanCostCombinedCount(const int* X, const int* Y,
int length) {
static VP8LStreaks HuffmanCostCombinedCount(const uint32_t* X,
const uint32_t* Y, int length) {
int i;
int streak = 0;
VP8LStreaks stats;
@ -1524,6 +1528,41 @@ static VP8LStreaks HuffmanCostCombinedCount(const int* X, const int* Y,
//------------------------------------------------------------------------------
static void HistogramAdd(const VP8LHistogram* const a,
const VP8LHistogram* const b,
VP8LHistogram* const out) {
int i;
const int literal_size = VP8LHistogramNumCodes(a->palette_code_bits_);
assert(a->palette_code_bits_ == b->palette_code_bits_);
if (b != out) {
for (i = 0; i < literal_size; ++i) {
out->literal_[i] = a->literal_[i] + b->literal_[i];
}
for (i = 0; i < NUM_DISTANCE_CODES; ++i) {
out->distance_[i] = a->distance_[i] + b->distance_[i];
}
for (i = 0; i < NUM_LITERAL_CODES; ++i) {
out->red_[i] = a->red_[i] + b->red_[i];
out->blue_[i] = a->blue_[i] + b->blue_[i];
out->alpha_[i] = a->alpha_[i] + b->alpha_[i];
}
} else {
for (i = 0; i < literal_size; ++i) {
out->literal_[i] += a->literal_[i];
}
for (i = 0; i < NUM_DISTANCE_CODES; ++i) {
out->distance_[i] += a->distance_[i];
}
for (i = 0; i < NUM_LITERAL_CODES; ++i) {
out->red_[i] += a->red_[i];
out->blue_[i] += a->blue_[i];
out->alpha_[i] += a->alpha_[i];
}
}
}
//------------------------------------------------------------------------------
VP8LProcessBlueAndRedFunc VP8LSubtractGreenFromBlueAndRed;
VP8LProcessBlueAndRedFunc VP8LAddGreenToBlueAndRed;
VP8LPredictorFunc VP8LPredictors[16];
@ -1546,6 +1585,8 @@ VP8LCostCombinedFunc VP8LExtraCostCombined;
VP8LCostCountFunc VP8LHuffmanCostCount;
VP8LCostCombinedCountFunc VP8LHuffmanCostCombinedCount;
VP8LHistogramAddFunc VP8LHistogramAdd;
extern void VP8LDspInitSSE2(void);
extern void VP8LDspInitNEON(void);
extern void VP8LDspInitMIPS32(void);
@ -1574,6 +1615,8 @@ void VP8LDspInit(void) {
VP8LHuffmanCostCount = HuffmanCostCount;
VP8LHuffmanCostCombinedCount = HuffmanCostCombinedCount;
VP8LHistogramAdd = HistogramAdd;
// If defined, use CPUInfo() to overwrite some pointers with faster versions.
if (VP8GetCPUInfo != NULL) {
#if defined(WEBP_USE_SSE2)

25
src/dsp/lossless.h
View File

@ -18,6 +18,8 @@
#include "../webp/types.h"
#include "../webp/decode.h"
#include "../enc/histogram.h"
#ifdef __cplusplus
extern "C" {
#endif
@ -123,24 +125,25 @@ static WEBP_INLINE uint32_t VP8LSubSampleSize(uint32_t size,
#define LOG_LOOKUP_IDX_MAX 256
extern const float kLog2Table[LOG_LOOKUP_IDX_MAX];
extern const float kSLog2Table[LOG_LOOKUP_IDX_MAX];
typedef float (*VP8LFastLog2SlowFunc)(int v);
typedef float (*VP8LFastLog2SlowFunc)(uint32_t v);
extern VP8LFastLog2SlowFunc VP8LFastLog2Slow;
extern VP8LFastLog2SlowFunc VP8LFastSLog2Slow;
static WEBP_INLINE float VP8LFastLog2(int v) {
static WEBP_INLINE float VP8LFastLog2(uint32_t v) {
return (v < LOG_LOOKUP_IDX_MAX) ? kLog2Table[v] : VP8LFastLog2Slow(v);
}
// Fast calculation of v * log2(v) for integer input.
static WEBP_INLINE float VP8LFastSLog2(int v) {
static WEBP_INLINE float VP8LFastSLog2(uint32_t v) {
return (v < LOG_LOOKUP_IDX_MAX) ? kSLog2Table[v] : VP8LFastSLog2Slow(v);
}
// -----------------------------------------------------------------------------
// Huffman-cost related functions.
typedef double (*VP8LCostFunc)(const int* population, int length);
typedef double (*VP8LCostCombinedFunc)(const int* X, const int* Y, int length);
typedef double (*VP8LCostFunc)(const uint32_t* population, int length);
typedef double (*VP8LCostCombinedFunc)(const uint32_t* X, const uint32_t* Y,
int length);
extern VP8LCostFunc VP8LExtraCost;
extern VP8LCostCombinedFunc VP8LExtraCostCombined;
@ -150,13 +153,19 @@ typedef struct { // small struct to hold counters
int streaks[2][2]; // [zero/non-zero][streak<3 / streak>=3]
} VP8LStreaks;
typedef VP8LStreaks (*VP8LCostCountFunc)(const int* population, int length);
typedef VP8LStreaks (*VP8LCostCombinedCountFunc)(const int* X, const int* Y,
int length);
typedef VP8LStreaks (*VP8LCostCountFunc)(const uint32_t* population,
int length);
typedef VP8LStreaks (*VP8LCostCombinedCountFunc)(const uint32_t* X,
const uint32_t* Y, int length);
extern VP8LCostCountFunc VP8LHuffmanCostCount;
extern VP8LCostCombinedCountFunc VP8LHuffmanCostCombinedCount;
typedef void (*VP8LHistogramAddFunc)(const VP8LHistogram* const a,
const VP8LHistogram* const b,
VP8LHistogram* const out);
extern VP8LHistogramAddFunc VP8LHistogramAdd;
// -----------------------------------------------------------------------------
// PrefixEncode()

64
src/dsp/lossless_mips32.c
View File

@ -26,13 +26,13 @@
#define APPROX_LOG_MAX 4096
#define LOG_2_RECIPROCAL 1.44269504088896338700465094007086
static float FastSLog2Slow(int v) {
static float FastSLog2Slow(uint32_t v) {
assert(v >= LOG_LOOKUP_IDX_MAX);
if (v < APPROX_LOG_WITH_CORRECTION_MAX) {
int log_cnt, y, correction;
uint32_t log_cnt, y, correction;
const int c24 = 24;
const float v_f = (float)v;
int temp;
uint32_t temp;
// Xf = 256 = 2^8
// log_cnt is index of leading one in upper 24 bits
@ -62,13 +62,13 @@ static float FastSLog2Slow(int v) {
}
}
static float FastLog2Slow(int v) {
static float FastLog2Slow(uint32_t v) {
assert(v >= LOG_LOOKUP_IDX_MAX);
if (v < APPROX_LOG_WITH_CORRECTION_MAX) {
int log_cnt, y;
uint32_t log_cnt, y;
const int c24 = 24;
double log_2;
int temp;
uint32_t temp;
__asm__ volatile(
"clz %[log_cnt], %[v] \n\t"
@ -86,7 +86,7 @@ static float FastLog2Slow(int v) {
// Since the division is still expensive, add this correction factor only
// for large values of 'v'.
const int correction = (23 * (v & (y - 1))) >> 4;
const uint32_t correction = (23 * (v & (y - 1))) >> 4;
log_2 += (double)correction / v;
}
return (float)log_2;
@ -98,8 +98,8 @@ static float FastLog2Slow(int v) {
// C version of this function:
// int i = 0;
// int64_t cost = 0;
// int* pop = (int*)&population[4];
// const int* LoopEnd = (int*)&population[length];
// const uint32_t* pop = &population[4];
// const uint32_t* LoopEnd = &population[length];
// while (pop != LoopEnd) {
// ++i;
// cost += i * *pop;
@ -107,10 +107,10 @@ static float FastLog2Slow(int v) {
// pop += 2;
// }
// return (double)cost;
static double ExtraCost(const int* const population, int length) {
static double ExtraCost(const uint32_t* const population, int length) {
int i, temp0, temp1;
const int* pop = &population[4];
const int* const LoopEnd = &population[length];
const uint32_t* pop = &population[4];
const uint32_t* const LoopEnd = &population[length];
__asm__ volatile(
"mult $zero, $zero \n\t"
@ -139,12 +139,12 @@ static double ExtraCost(const int* const population, int length) {
// C version of this function:
// int i = 0;
// int64_t cost = 0;
// int* pX = (int*)&X[4];
// int* pY = (int*)&Y[4];
// const int* LoopEnd = (int*)&X[length];
// const uint32_t* pX = &X[4];
// const uint32_t* pY = &Y[4];
// const uint32_t* LoopEnd = &X[length];
// while (pX != LoopEnd) {
// const int xy0 = *pX + *pY;
// const int xy1 = *(pX + 1) + *(pY + 1);
// const uint32_t xy0 = *pX + *pY;
// const uint32_t xy1 = *(pX + 1) + *(pY + 1);
// ++i;
// cost += i * xy0;
// cost += i * xy1;
@ -152,12 +152,12 @@ static double ExtraCost(const int* const population, int length) {
// pY += 2;
// }
// return (double)cost;
static double ExtraCostCombined(const int* const X, const int* const Y,
int length) {
static double ExtraCostCombined(const uint32_t* const X,
const uint32_t* const Y, int length) {
int i, temp0, temp1, temp2, temp3;
const int* pX = &X[4];
const int* pY = &Y[4];
const int* const LoopEnd = &X[length];
const uint32_t* pX = &X[4];
const uint32_t* pY = &Y[4];
const uint32_t* const LoopEnd = &X[length];
__asm__ volatile(
"mult $zero, $zero \n\t"
@ -217,7 +217,7 @@ static double ExtraCostCombined(const int* const X, const int* const Y,
);
// Returns the various RLE counts
static VP8LStreaks HuffmanCostCount(const int* population, int length) {
static VP8LStreaks HuffmanCostCount(const uint32_t* population, int length) {
int i;
int streak = 0;
VP8LStreaks stats;
@ -230,19 +230,19 @@ static VP8LStreaks HuffmanCostCount(const int* population, int length) {
if (population[i] == population[i + 1]) {
continue;
}
temp0 = population[i] != 0;
temp0 = (population[i] != 0);
HUFFMAN_COST_PASS
streak = 0;
}
++streak;
temp0 = population[i] != 0;
temp0 = (population[i] != 0);
HUFFMAN_COST_PASS
return stats;
}
static VP8LStreaks HuffmanCostCombinedCount(const int* X, const int* Y,
int length) {
static VP8LStreaks HuffmanCostCombinedCount(const uint32_t* X,
const uint32_t* Y, int length) {
int i;
int streak = 0;
VP8LStreaks stats;
@ -251,20 +251,20 @@ static VP8LStreaks HuffmanCostCombinedCount(const int* X, const int* Y,
int temp0, temp1, temp2, temp3;
memset(&stats, 0, sizeof(stats));
for (i = 0; i < length - 1; ++i) {
const int xy = X[i] + Y[i];
const int xy_next = X[i + 1] + Y[i + 1];
const uint32_t xy = X[i] + Y[i];
const uint32_t xy_next = X[i + 1] + Y[i + 1];
++streak;
if (xy == xy_next) {
continue;
}
temp0 = xy != 0;
temp0 = (xy != 0);
HUFFMAN_COST_PASS
streak = 0;
}
{
const int xy = X[i] + Y[i];
const uint32_t xy = X[i] + Y[i];
++streak;
temp0 = xy != 0;
temp0 = (xy != 0);
HUFFMAN_COST_PASS
}

84
src/dsp/lossless_sse2.c
View File

@ -383,6 +383,88 @@ static void ConvertBGRAToBGR(const uint32_t* src,
VP8LConvertBGRAToBGR_C((const uint32_t*)in, num_pixels, dst);
}
//------------------------------------------------------------------------------
#define LINE_SIZE 16 // 8 or 16
static void AddVector(const uint32_t* a, const uint32_t* b, uint32_t* out,
int size) {
int i;
assert(size % LINE_SIZE == 0);
for (i = 0; i < size; i += LINE_SIZE) {
const __m128i a0 = _mm_loadu_si128((__m128i*)&a[i + 0]);
const __m128i a1 = _mm_loadu_si128((__m128i*)&a[i + 4]);
#if (LINE_SIZE == 16)
const __m128i a2 = _mm_loadu_si128((__m128i*)&a[i + 8]);
const __m128i a3 = _mm_loadu_si128((__m128i*)&a[i + 12]);
#endif
const __m128i b0 = _mm_loadu_si128((__m128i*)&b[i + 0]);
const __m128i b1 = _mm_loadu_si128((__m128i*)&b[i + 4]);
#if (LINE_SIZE == 16)
const __m128i b2 = _mm_loadu_si128((__m128i*)&b[i + 8]);
const __m128i b3 = _mm_loadu_si128((__m128i*)&b[i + 12]);
#endif
_mm_storeu_si128((__m128i*)&out[i + 0], _mm_add_epi32(a0, b0));
_mm_storeu_si128((__m128i*)&out[i + 4], _mm_add_epi32(a1, b1));
#if (LINE_SIZE == 16)
_mm_storeu_si128((__m128i*)&out[i + 8], _mm_add_epi32(a2, b2));
_mm_storeu_si128((__m128i*)&out[i + 12], _mm_add_epi32(a3, b3));
#endif
}
}
static void AddVectorEq(const uint32_t* a, uint32_t* out, int size) {
int i;
assert(size % LINE_SIZE == 0);
for (i = 0; i < size; i += LINE_SIZE) {
const __m128i a0 = _mm_loadu_si128((__m128i*)&a[i + 0]);
const __m128i a1 = _mm_loadu_si128((__m128i*)&a[i + 4]);
#if (LINE_SIZE == 16)
const __m128i a2 = _mm_loadu_si128((__m128i*)&a[i + 8]);
const __m128i a3 = _mm_loadu_si128((__m128i*)&a[i + 12]);
#endif
const __m128i b0 = _mm_loadu_si128((__m128i*)&out[i + 0]);
const __m128i b1 = _mm_loadu_si128((__m128i*)&out[i + 4]);
#if (LINE_SIZE == 16)
const __m128i b2 = _mm_loadu_si128((__m128i*)&out[i + 8]);
const __m128i b3 = _mm_loadu_si128((__m128i*)&out[i + 12]);
#endif
_mm_storeu_si128((__m128i*)&out[i + 0], _mm_add_epi32(a0, b0));
_mm_storeu_si128((__m128i*)&out[i + 4], _mm_add_epi32(a1, b1));
#if (LINE_SIZE == 16)
_mm_storeu_si128((__m128i*)&out[i + 8], _mm_add_epi32(a2, b2));
_mm_storeu_si128((__m128i*)&out[i + 12], _mm_add_epi32(a3, b3));
#endif
}
}
#undef LINE_SIZE
// Note we are adding uint32_t's as *signed* int32's (using _mm_add_epi32). But
// that's ok since the histogram values are less than 1<<28 (max picture size).
static void HistogramAdd(const VP8LHistogram* const a,
const VP8LHistogram* const b,
VP8LHistogram* const out) {
int i;
const int literal_size = VP8LHistogramNumCodes(a->palette_code_bits_);
assert(a->palette_code_bits_ == b->palette_code_bits_);
if (b != out) {
AddVector(a->literal_, b->literal_, out->literal_, NUM_LITERAL_CODES);
AddVector(a->red_, b->red_, out->red_, NUM_LITERAL_CODES);
AddVector(a->blue_, b->blue_, out->blue_, NUM_LITERAL_CODES);
AddVector(a->alpha_, b->alpha_, out->alpha_, NUM_LITERAL_CODES);
} else {
AddVectorEq(a->literal_, out->literal_, NUM_LITERAL_CODES);
AddVectorEq(a->red_, out->red_, NUM_LITERAL_CODES);
AddVectorEq(a->blue_, out->blue_, NUM_LITERAL_CODES);
AddVectorEq(a->alpha_, out->alpha_, NUM_LITERAL_CODES);
}
for (i = NUM_LITERAL_CODES; i < literal_size; ++i) {
out->literal_[i] = a->literal_[i] + b->literal_[i];
}
for (i = 0; i < NUM_DISTANCE_CODES; ++i) {
out->distance_[i] = a->distance_[i] + b->distance_[i];
}
}
#endif // WEBP_USE_SSE2
//------------------------------------------------------------------------------
@ -405,6 +487,8 @@ void VP8LDspInitSSE2(void) {
VP8LConvertBGRAToRGBA4444 = ConvertBGRAToRGBA4444;
VP8LConvertBGRAToRGB565 = ConvertBGRAToRGB565;
VP8LConvertBGRAToBGR = ConvertBGRAToBGR;
VP8LHistogramAdd = HistogramAdd;
#endif // WEBP_USE_SSE2
}

4
src/enc/backward_references.c
View File

@ -405,8 +405,8 @@ static int BackwardReferencesTraceBackwards(
VP8LBackwardRefs* const refs);
static void ConvertPopulationCountTableToBitEstimates(
int num_symbols, const int population_counts[], double output[]) {
int sum = 0;
int num_symbols, const uint32_t population_counts[], double output[]) {
uint32_t sum = 0;
int nonzeros = 0;
int i;
for (i = 0; i < num_symbols; ++i) {

71
src/enc/histogram.c
View File

@ -29,7 +29,7 @@
#define BIN_SIZE (NUM_PARTITIONS * NUM_PARTITIONS * NUM_PARTITIONS)
static void HistogramClear(VP8LHistogram* const p) {
int* const literal = p->literal_;
uint32_t* const literal = p->literal_;
const int cache_bits = p->palette_code_bits_;
const uint64_t histo_size = VP8LGetHistogramSize(cache_bits);
memset(p, 0, histo_size);
@ -39,7 +39,7 @@ static void HistogramClear(VP8LHistogram* const p) {
static void HistogramCopy(const VP8LHistogram* const src,
VP8LHistogram* const dst) {
int* const dst_literal = dst->literal_;
uint32_t* const dst_literal = dst->literal_;
const int dst_cache_bits = dst->palette_code_bits_;
const uint64_t histo_size = VP8LGetHistogramSize(dst_cache_bits);
assert(src->palette_code_bits_ == dst_cache_bits);
@ -92,7 +92,7 @@ VP8LHistogram* VP8LAllocateHistogram(int cache_bits) {
if (memory == NULL) return NULL;
histo = (VP8LHistogram*)memory;
// literal_ won't necessary be aligned.
histo->literal_ = (int*)(memory + sizeof(VP8LHistogram));
histo->literal_ = (uint32_t*)(memory + sizeof(VP8LHistogram));
VP8LHistogramInit(histo, cache_bits);
return histo;
}
@ -115,7 +115,7 @@ VP8LHistogramSet* VP8LAllocateHistogramSet(int size, int cache_bits) {
for (i = 0; i < size; ++i) {
set->histograms[i] = (VP8LHistogram*)memory;
// literal_ won't necessary be aligned.
set->histograms[i]->literal_ = (int*)(memory + sizeof(VP8LHistogram));
set->histograms[i]->literal_ = (uint32_t*)(memory + sizeof(VP8LHistogram));
VP8LHistogramInit(set->histograms[i], cache_bits);
// There's no padding/alignment between successive histograms.
memory += VP8LGetHistogramSize(cache_bits);
@ -133,7 +133,7 @@ void VP8LHistogramAddSinglePixOrCopy(VP8LHistogram* const histo,
++histo->literal_[PixOrCopyLiteral(v, 1)];
++histo->blue_[PixOrCopyLiteral(v, 0)];
} else if (PixOrCopyIsCacheIdx(v)) {
int literal_ix =
const int literal_ix =
NUM_LITERAL_CODES + NUM_LENGTH_CODES + PixOrCopyCacheIdx(v);
++histo->literal_[literal_ix];
} else {
@ -178,11 +178,11 @@ static WEBP_INLINE double BitsEntropyRefine(int nonzeros, int sum, int max_val,
}
}
static double BitsEntropy(const int* const array, int n) {
static double BitsEntropy(const uint32_t* const array, int n) {
double retval = 0.;
int sum = 0;
uint32_t sum = 0;
int nonzeros = 0;
int max_val = 0;
uint32_t max_val = 0;
int i;
for (i = 0; i < n; ++i) {
if (array[i] != 0) {
@ -198,8 +198,8 @@ static double BitsEntropy(const int* const array, int n) {
return BitsEntropyRefine(nonzeros, sum, max_val, retval);
}
static double BitsEntropyCombined(const int* const X, const int* const Y,
int n) {
static double BitsEntropyCombined(const uint32_t* const X,
const uint32_t* const Y, int n) {
double retval = 0.;
int sum = 0;
int nonzeros = 0;
@ -239,24 +239,24 @@ static double FinalHuffmanCost(const VP8LStreaks* const stats) {
}
// Trampolines
static double HuffmanCost(const int* const population, int length) {
static double HuffmanCost(const uint32_t* const population, int length) {
const VP8LStreaks stats = VP8LHuffmanCostCount(population, length);
return FinalHuffmanCost(&stats);
}
static double HuffmanCostCombined(const int* const X, const int* const Y,
int length) {
static double HuffmanCostCombined(const uint32_t* const X,
const uint32_t* const Y, int length) {
const VP8LStreaks stats = VP8LHuffmanCostCombinedCount(X, Y, length);
return FinalHuffmanCost(&stats);
}
// Aggregated costs
static double PopulationCost(const int* const population, int length) {
static double PopulationCost(const uint32_t* const population, int length) {
return BitsEntropy(population, length) + HuffmanCost(population, length);
}
static double GetCombinedEntropy(const int* const X, const int* const Y,
int length) {
static double GetCombinedEntropy(const uint32_t* const X,
const uint32_t* const Y, int length) {
return BitsEntropyCombined(X, Y, length) + HuffmanCostCombined(X, Y, length);
}
@ -286,25 +286,6 @@ double VP8LHistogramEstimateBitsBulk(const VP8LHistogram* const p) {
// -----------------------------------------------------------------------------
// Various histogram combine/cost-eval functions
// Adds 'in' histogram to 'out'
static void HistogramAdd(const VP8LHistogram* const in,
VP8LHistogram* const out) {
int i;
const int literal_size = VP8LHistogramNumCodes(in->palette_code_bits_);
assert(in->palette_code_bits_ == out->palette_code_bits_);
for (i = 0; i < literal_size; ++i) {
out->literal_[i] += in->literal_[i];
}
for (i = 0; i < NUM_DISTANCE_CODES; ++i) {
out->distance_[i] += in->distance_[i];
}
for (i = 0; i < NUM_LITERAL_CODES; ++i) {
out->red_[i] += in->red_[i];
out->blue_[i] += in->blue_[i];
out->alpha_[i] += in->alpha_[i];
}
}
static int GetCombinedHistogramEntropy(const VP8LHistogram* const a,
const VP8LHistogram* const b,
double cost_threshold,
@ -347,23 +328,10 @@ static double HistogramAddEval(const VP8LHistogram* const a,
double cost_threshold) {
double cost = 0;
const double sum_cost = a->bit_cost_ + b->bit_cost_;
int i;
assert(a->palette_code_bits_ == b->palette_code_bits_);
cost_threshold += sum_cost;
if (GetCombinedHistogramEntropy(a, b, cost_threshold, &cost)) {
const int literal_size = VP8LHistogramNumCodes(a->palette_code_bits_);
for (i = 0; i < literal_size; ++i) {
out->literal_[i] = a->literal_[i] + b->literal_[i];
}
for (i = 0; i < NUM_DISTANCE_CODES; ++i) {
out->distance_[i] = a->distance_[i] + b->distance_[i];
}
for (i = 0; i < NUM_LITERAL_CODES; ++i) {
out->red_[i] = a->red_[i] + b->red_[i];
out->blue_[i] = a->blue_[i] + b->blue_[i];
out->alpha_[i] = a->alpha_[i] + b->alpha_[i];
}
VP8LHistogramAdd(a, b, out);
out->bit_cost_ = cost;
out->palette_code_bits_ = a->palette_code_bits_;
}
@ -697,8 +665,9 @@ static void HistogramRemap(const VP8LHistogramSet* const init_histo,
}
for (i = 0; i < init_histo->size; ++i) {
HistogramAdd(init_histo->histograms[i],
histo_image->histograms[symbols[i]]);
VP8LHistogramAdd(init_histo->histograms[i],
histo_image->histograms[symbols[i]],
histo_image->histograms[symbols[i]]);
}
}

10
src/enc/histogram.h
View File

@ -32,12 +32,12 @@ extern "C" {
typedef struct {
// literal_ contains green literal, palette-code and
// copy-length-prefix histogram
int* literal_; // Pointer to the allocated buffer for literal.
int red_[256];
int blue_[256];
int alpha_[256];
uint32_t* literal_; // Pointer to the allocated buffer for literal.
uint32_t red_[NUM_LITERAL_CODES];
uint32_t blue_[NUM_LITERAL_CODES];
uint32_t alpha_[NUM_LITERAL_CODES];
// Backward reference prefix-code histogram.
int distance_[NUM_DISTANCE_CODES];
uint32_t distance_[NUM_DISTANCE_CODES];
int palette_code_bits_;
double bit_cost_; // cached value of VP8LHistogramEstimateBits(this)
double literal_cost_; // Cached values of dominant entropy costs:

2
src/enc/vp8l.c
View File

@ -330,7 +330,7 @@ static void StoreFullHuffmanCode(VP8LBitWriter* const bw,
VP8LWriteBits(bw, 1, 0);
num_tokens = VP8LCreateCompressedHuffmanTree(tree, tokens, max_tokens);
{
int histogram[CODE_LENGTH_CODES] = { 0 };
uint32_t histogram[CODE_LENGTH_CODES] = { 0 };
uint8_t buf_rle[CODE_LENGTH_CODES] = { 0 };
int i;
for (i = 0; i < num_tokens; ++i) {

25
src/utils/huffman_encode.c
View File

@ -29,7 +29,7 @@ static int ValuesShouldBeCollapsedToStrideAverage(int a, int b) {
// Change the population counts in a way that the consequent
// Huffman tree compression, especially its RLE-part, give smaller output.
static void OptimizeHuffmanForRle(int length, uint8_t* const good_for_rle,
int* const counts) {
uint32_t* const counts) {
// 1) Let's make the Huffman code more compatible with rle encoding.
int i;
for (; length >= 0; --length) {
@ -47,7 +47,7 @@ static void OptimizeHuffmanForRle(int length, uint8_t* const good_for_rle,
// Let's not spoil any of the existing good rle codes.
// Mark any seq of 0's that is longer as 5 as a good_for_rle.
// Mark any seq of non-0's that is longer as 7 as a good_for_rle.
int symbol = counts[0];
uint32_t symbol = counts[0];
int stride = 0;
for (i = 0; i < length + 1; ++i) {
if (i == length || counts[i] != symbol) {
@ -69,17 +69,17 @@ static void OptimizeHuffmanForRle(int length, uint8_t* const good_for_rle,
}
// 3) Let's replace those population counts that lead to more rle codes.
{
int stride = 0;
int limit = counts[0];
int sum = 0;
uint32_t stride = 0;
uint32_t limit = counts[0];
uint32_t sum = 0;
for (i = 0; i < length + 1; ++i) {
if (i == length || good_for_rle[i] ||
(i != 0 && good_for_rle[i - 1]) ||
!ValuesShouldBeCollapsedToStrideAverage(counts[i], limit)) {
if (stride >= 4 || (stride >= 3 && sum == 0)) {
int k;
uint32_t k;
// The stride must end, collapse what we have, if we have enough (4).
int count = (sum + stride / 2) / stride;
uint32_t count = (sum + stride / 2) / stride;
if (count < 1) {
count = 1;
}
@ -162,10 +162,11 @@ static void SetBitDepths(const HuffmanTree* const tree,
// we are not planning to use this with extremely long blocks.
//
// See http://en.wikipedia.org/wiki/Huffman_coding
static void GenerateOptimalTree(const int* const histogram, int histogram_size,
static void GenerateOptimalTree(const uint32_t* const histogram,
int histogram_size,
HuffmanTree* tree, int tree_depth_limit,
uint8_t* const bit_depths) {
int count_min;
uint32_t count_min;
HuffmanTree* tree_pool;
int tree_size_orig = 0;
int i;
@ -195,7 +196,7 @@ static void GenerateOptimalTree(const int* const histogram, int histogram_size,
int j;
for (j = 0; j < histogram_size; ++j) {
if (histogram[j] != 0) {
const int count =
const uint32_t count =
(histogram[j] < count_min) ? count_min : histogram[j];
tree[idx].total_count_ = count;
tree[idx].value_ = j;
@ -211,7 +212,7 @@ static void GenerateOptimalTree(const int* const histogram, int histogram_size,
if (tree_size > 1) { // Normal case.
int tree_pool_size = 0;
while (tree_size > 1) { // Finish when we have only one root.
int count;
uint32_t count;
tree_pool[tree_pool_size++] = tree[tree_size - 1];
tree_pool[tree_pool_size++] = tree[tree_size - 2];
count = tree_pool[tree_pool_size - 1].total_count_ +
@ -402,7 +403,7 @@ static void ConvertBitDepthsToSymbols(HuffmanTreeCode* const tree) {
// -----------------------------------------------------------------------------
// Main entry point
void VP8LCreateHuffmanTree(int* const histogram, int tree_depth_limit,
void VP8LCreateHuffmanTree(uint32_t* const histogram, int tree_depth_limit,
uint8_t* const buf_rle,
HuffmanTree* const huff_tree,
HuffmanTreeCode* const huff_code) {

4
src/utils/huffman_encode.h
View File

@ -36,7 +36,7 @@ typedef struct {
// Struct to represent the Huffman tree.
// TODO(vikasa): Add comment for the fields of the Struct.
typedef struct {
int total_count_;
uint32_t total_count_;
int value_;
int pool_index_left_; // Index for the left sub-tree.
int pool_index_right_; // Index for the right sub-tree.
@ -50,7 +50,7 @@ int VP8LCreateCompressedHuffmanTree(const HuffmanTreeCode* const tree,
// Create an optimized tree, and tokenize it.
// 'buf_rle' and 'huff_tree' are pre-allocated and the 'tree' is the constructed
// huffman code tree.
void VP8LCreateHuffmanTree(int* const histogram, int tree_depth_limit,
void VP8LCreateHuffmanTree(uint32_t* const histogram, int tree_depth_limit,
uint8_t* const buf_rle, HuffmanTree* const huff_tree,
HuffmanTreeCode* const tree);