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Diffstat (limited to 'media/libwebp/src/enc/vp8l_enc.c')
-rw-r--r--media/libwebp/src/enc/vp8l_enc.c389
1 files changed, 42 insertions, 347 deletions
diff --git a/media/libwebp/src/enc/vp8l_enc.c b/media/libwebp/src/enc/vp8l_enc.c
index 3a8ec3dd1e..40eafa4169 100644
--- a/media/libwebp/src/enc/vp8l_enc.c
+++ b/media/libwebp/src/enc/vp8l_enc.c
@@ -23,6 +23,7 @@
#include "src/enc/vp8li_enc.h"
#include "src/utils/bit_writer_utils.h"
#include "src/utils/huffman_encode_utils.h"
+#include "src/utils/palette.h"
#include "src/utils/utils.h"
#include "src/webp/encode.h"
#include "src/webp/format_constants.h"
@@ -30,298 +31,6 @@
// Maximum number of histogram images (sub-blocks).
#define MAX_HUFF_IMAGE_SIZE 2600
-// Palette reordering for smaller sum of deltas (and for smaller storage).
-
-static int PaletteCompareColorsForQsort(const void* p1, const void* p2) {
- const uint32_t a = WebPMemToUint32((uint8_t*)p1);
- const uint32_t b = WebPMemToUint32((uint8_t*)p2);
- assert(a != b);
- return (a < b) ? -1 : 1;
-}
-
-static WEBP_INLINE uint32_t PaletteComponentDistance(uint32_t v) {
- return (v <= 128) ? v : (256 - v);
-}
-
-// Computes a value that is related to the entropy created by the
-// palette entry diff.
-//
-// Note that the last & 0xff is a no-operation in the next statement, but
-// removed by most compilers and is here only for regularity of the code.
-static WEBP_INLINE uint32_t PaletteColorDistance(uint32_t col1, uint32_t col2) {
- const uint32_t diff = VP8LSubPixels(col1, col2);
- const int kMoreWeightForRGBThanForAlpha = 9;
- uint32_t score;
- score = PaletteComponentDistance((diff >> 0) & 0xff);
- score += PaletteComponentDistance((diff >> 8) & 0xff);
- score += PaletteComponentDistance((diff >> 16) & 0xff);
- score *= kMoreWeightForRGBThanForAlpha;
- score += PaletteComponentDistance((diff >> 24) & 0xff);
- return score;
-}
-
-static WEBP_INLINE void SwapColor(uint32_t* const col1, uint32_t* const col2) {
- const uint32_t tmp = *col1;
- *col1 = *col2;
- *col2 = tmp;
-}
-
-static WEBP_INLINE int SearchColorNoIdx(const uint32_t sorted[], uint32_t color,
- int num_colors) {
- int low = 0, hi = num_colors;
- if (sorted[low] == color) return low; // loop invariant: sorted[low] != color
- while (1) {
- const int mid = (low + hi) >> 1;
- if (sorted[mid] == color) {
- return mid;
- } else if (sorted[mid] < color) {
- low = mid;
- } else {
- hi = mid;
- }
- }
- assert(0);
- return 0;
-}
-
-// The palette has been sorted by alpha. This function checks if the other
-// components of the palette have a monotonic development with regards to
-// position in the palette. If all have monotonic development, there is
-// no benefit to re-organize them greedily. A monotonic development
-// would be spotted in green-only situations (like lossy alpha) or gray-scale
-// images.
-static int PaletteHasNonMonotonousDeltas(const uint32_t* const palette,
- int num_colors) {
- uint32_t predict = 0x000000;
- int i;
- uint8_t sign_found = 0x00;
- for (i = 0; i < num_colors; ++i) {
- const uint32_t diff = VP8LSubPixels(palette[i], predict);
- const uint8_t rd = (diff >> 16) & 0xff;
- const uint8_t gd = (diff >> 8) & 0xff;
- const uint8_t bd = (diff >> 0) & 0xff;
- if (rd != 0x00) {
- sign_found |= (rd < 0x80) ? 1 : 2;
- }
- if (gd != 0x00) {
- sign_found |= (gd < 0x80) ? 8 : 16;
- }
- if (bd != 0x00) {
- sign_found |= (bd < 0x80) ? 64 : 128;
- }
- predict = palette[i];
- }
- return (sign_found & (sign_found << 1)) != 0; // two consequent signs.
-}
-
-static void PaletteSortMinimizeDeltas(const uint32_t* const palette_sorted,
- int num_colors, uint32_t* const palette) {
- uint32_t predict = 0x00000000;
- int i, k;
- memcpy(palette, palette_sorted, num_colors * sizeof(*palette));
- if (!PaletteHasNonMonotonousDeltas(palette_sorted, num_colors)) return;
- // Find greedily always the closest color of the predicted color to minimize
- // deltas in the palette. This reduces storage needs since the
- // palette is stored with delta encoding.
- for (i = 0; i < num_colors; ++i) {
- int best_ix = i;
- uint32_t best_score = ~0U;
- for (k = i; k < num_colors; ++k) {
- const uint32_t cur_score = PaletteColorDistance(palette[k], predict);
- if (best_score > cur_score) {
- best_score = cur_score;
- best_ix = k;
- }
- }
- SwapColor(&palette[best_ix], &palette[i]);
- predict = palette[i];
- }
-}
-
-// Sort palette in increasing order and prepare an inverse mapping array.
-static void PrepareMapToPalette(const uint32_t palette[], uint32_t num_colors,
- uint32_t sorted[], uint32_t idx_map[]) {
- uint32_t i;
- memcpy(sorted, palette, num_colors * sizeof(*sorted));
- qsort(sorted, num_colors, sizeof(*sorted), PaletteCompareColorsForQsort);
- for (i = 0; i < num_colors; ++i) {
- idx_map[SearchColorNoIdx(sorted, palette[i], num_colors)] = i;
- }
-}
-
-// -----------------------------------------------------------------------------
-// Modified Zeng method from "A Survey on Palette Reordering
-// Methods for Improving the Compression of Color-Indexed Images" by Armando J.
-// Pinho and Antonio J. R. Neves.
-
-// Finds the biggest cooccurrence in the matrix.
-static void CoOccurrenceFindMax(const uint32_t* const cooccurrence,
- uint32_t num_colors, uint8_t* const c1,
- uint8_t* const c2) {
- // Find the index that is most frequently located adjacent to other
- // (different) indexes.
- uint32_t best_sum = 0u;
- uint32_t i, j, best_cooccurrence;
- *c1 = 0u;
- for (i = 0; i < num_colors; ++i) {
- uint32_t sum = 0;
- for (j = 0; j < num_colors; ++j) sum += cooccurrence[i * num_colors + j];
- if (sum > best_sum) {
- best_sum = sum;
- *c1 = i;
- }
- }
- // Find the index that is most frequently found adjacent to *c1.
- *c2 = 0u;
- best_cooccurrence = 0u;
- for (i = 0; i < num_colors; ++i) {
- if (cooccurrence[*c1 * num_colors + i] > best_cooccurrence) {
- best_cooccurrence = cooccurrence[*c1 * num_colors + i];
- *c2 = i;
- }
- }
- assert(*c1 != *c2);
-}
-
-// Builds the cooccurrence matrix
-static int CoOccurrenceBuild(const WebPPicture* const pic,
- const uint32_t* const palette, uint32_t num_colors,
- uint32_t* cooccurrence) {
- uint32_t *lines, *line_top, *line_current, *line_tmp;
- int x, y;
- const uint32_t* src = pic->argb;
- uint32_t prev_pix = ~src[0];
- uint32_t prev_idx = 0u;
- uint32_t idx_map[MAX_PALETTE_SIZE] = {0};
- uint32_t palette_sorted[MAX_PALETTE_SIZE];
- lines = (uint32_t*)WebPSafeMalloc(2 * pic->width, sizeof(*lines));
- if (lines == NULL) {
- return WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
- }
- line_top = &lines[0];
- line_current = &lines[pic->width];
- PrepareMapToPalette(palette, num_colors, palette_sorted, idx_map);
- for (y = 0; y < pic->height; ++y) {
- for (x = 0; x < pic->width; ++x) {
- const uint32_t pix = src[x];
- if (pix != prev_pix) {
- prev_idx = idx_map[SearchColorNoIdx(palette_sorted, pix, num_colors)];
- prev_pix = pix;
- }
- line_current[x] = prev_idx;
- // 4-connectivity is what works best as mentioned in "On the relation
- // between Memon's and the modified Zeng's palette reordering methods".
- if (x > 0 && prev_idx != line_current[x - 1]) {
- const uint32_t left_idx = line_current[x - 1];
- ++cooccurrence[prev_idx * num_colors + left_idx];
- ++cooccurrence[left_idx * num_colors + prev_idx];
- }
- if (y > 0 && prev_idx != line_top[x]) {
- const uint32_t top_idx = line_top[x];
- ++cooccurrence[prev_idx * num_colors + top_idx];
- ++cooccurrence[top_idx * num_colors + prev_idx];
- }
- }
- line_tmp = line_top;
- line_top = line_current;
- line_current = line_tmp;
- src += pic->argb_stride;
- }
- WebPSafeFree(lines);
- return 1;
-}
-
-struct Sum {
- uint8_t index;
- uint32_t sum;
-};
-
-// Implements the modified Zeng method from "A Survey on Palette Reordering
-// Methods for Improving the Compression of Color-Indexed Images" by Armando J.
-// Pinho and Antonio J. R. Neves.
-static int PaletteSortModifiedZeng(
- const WebPPicture* const pic, const uint32_t* const palette_sorted,
- uint32_t num_colors, uint32_t* const palette) {
- uint32_t i, j, ind;
- uint8_t remapping[MAX_PALETTE_SIZE];
- uint32_t* cooccurrence;
- struct Sum sums[MAX_PALETTE_SIZE];
- uint32_t first, last;
- uint32_t num_sums;
- // TODO(vrabaud) check whether one color images should use palette or not.
- if (num_colors <= 1) return 1;
- // Build the co-occurrence matrix.
- cooccurrence =
- (uint32_t*)WebPSafeCalloc(num_colors * num_colors, sizeof(*cooccurrence));
- if (cooccurrence == NULL) {
- return WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
- }
- if (!CoOccurrenceBuild(pic, palette_sorted, num_colors, cooccurrence)) {
- WebPSafeFree(cooccurrence);
- return 0;
- }
-
- // Initialize the mapping list with the two best indices.
- CoOccurrenceFindMax(cooccurrence, num_colors, &remapping[0], &remapping[1]);
-
- // We need to append and prepend to the list of remapping. To this end, we
- // actually define the next start/end of the list as indices in a vector (with
- // a wrap around when the end is reached).
- first = 0;
- last = 1;
- num_sums = num_colors - 2; // -2 because we know the first two values
- if (num_sums > 0) {
- // Initialize the sums with the first two remappings and find the best one
- struct Sum* best_sum = &sums[0];
- best_sum->index = 0u;
- best_sum->sum = 0u;
- for (i = 0, j = 0; i < num_colors; ++i) {
- if (i == remapping[0] || i == remapping[1]) continue;
- sums[j].index = i;
- sums[j].sum = cooccurrence[i * num_colors + remapping[0]] +
- cooccurrence[i * num_colors + remapping[1]];
- if (sums[j].sum > best_sum->sum) best_sum = &sums[j];
- ++j;
- }
-
- while (num_sums > 0) {
- const uint8_t best_index = best_sum->index;
- // Compute delta to know if we need to prepend or append the best index.
- int32_t delta = 0;
- const int32_t n = num_colors - num_sums;
- for (ind = first, j = 0; (ind + j) % num_colors != last + 1; ++j) {
- const uint16_t l_j = remapping[(ind + j) % num_colors];
- delta += (n - 1 - 2 * (int32_t)j) *
- (int32_t)cooccurrence[best_index * num_colors + l_j];
- }
- if (delta > 0) {
- first = (first == 0) ? num_colors - 1 : first - 1;
- remapping[first] = best_index;
- } else {
- ++last;
- remapping[last] = best_index;
- }
- // Remove best_sum from sums.
- *best_sum = sums[num_sums - 1];
- --num_sums;
- // Update all the sums and find the best one.
- best_sum = &sums[0];
- for (i = 0; i < num_sums; ++i) {
- sums[i].sum += cooccurrence[best_index * num_colors + sums[i].index];
- if (sums[i].sum > best_sum->sum) best_sum = &sums[i];
- }
- }
- }
- assert((last + 1) % num_colors == first);
- WebPSafeFree(cooccurrence);
-
- // Re-map the palette.
- for (i = 0; i < num_colors; ++i) {
- palette[i] = palette_sorted[remapping[(first + i) % num_colors]];
- }
- return 1;
-}
-
// -----------------------------------------------------------------------------
// Palette
@@ -337,13 +46,6 @@ typedef enum {
} EntropyIx;
typedef enum {
- kSortedDefault = 0,
- kMinimizeDelta = 1,
- kModifiedZeng = 2,
- kUnusedPalette = 3,
-} PaletteSorting;
-
-typedef enum {
kHistoAlpha = 0,
kHistoAlphaPred,
kHistoGreen,
@@ -565,7 +267,7 @@ typedef struct {
// +2 because we add a palette sorting configuration for kPalette and
// kPaletteAndSpatial.
-#define CRUNCH_CONFIGS_MAX (kNumEntropyIx + 2)
+#define CRUNCH_CONFIGS_MAX (kNumEntropyIx + 2 * kPaletteSortingNum)
static int EncoderAnalyze(VP8LEncoder* const enc,
CrunchConfig crunch_configs[CRUNCH_CONFIGS_MAX],
@@ -586,13 +288,10 @@ static int EncoderAnalyze(VP8LEncoder* const enc,
assert(pic != NULL && pic->argb != NULL);
// Check whether a palette is possible.
- enc->palette_size_ = WebPGetColorPalette(pic, enc->palette_sorted_);
+ enc->palette_size_ = GetColorPalette(pic, enc->palette_sorted_);
use_palette = (enc->palette_size_ <= MAX_PALETTE_SIZE);
if (!use_palette) {
enc->palette_size_ = 0;
- } else {
- qsort(enc->palette_sorted_, enc->palette_size_,
- sizeof(*enc->palette_sorted_), PaletteCompareColorsForQsort);
}
// Empirical bit sizes.
@@ -625,20 +324,29 @@ static int EncoderAnalyze(VP8LEncoder* const enc,
// a palette.
if ((i != kPalette && i != kPaletteAndSpatial) || use_palette) {
assert(*crunch_configs_size < CRUNCH_CONFIGS_MAX);
- crunch_configs[(*crunch_configs_size)].entropy_idx_ = i;
if (use_palette && (i == kPalette || i == kPaletteAndSpatial)) {
- crunch_configs[(*crunch_configs_size)].palette_sorting_type_ =
- kMinimizeDelta;
- ++*crunch_configs_size;
- // Also add modified Zeng's method.
- crunch_configs[(*crunch_configs_size)].entropy_idx_ = i;
- crunch_configs[(*crunch_configs_size)].palette_sorting_type_ =
- kModifiedZeng;
+ int sorting_method;
+ for (sorting_method = 0; sorting_method < kPaletteSortingNum;
+ ++sorting_method) {
+ const PaletteSorting typed_sorting_method =
+ (PaletteSorting)sorting_method;
+ // TODO(vrabaud) kSortedDefault should be tested. It is omitted
+ // for now for backward compatibility.
+ if (typed_sorting_method == kUnusedPalette ||
+ typed_sorting_method == kSortedDefault) {
+ continue;
+ }
+ crunch_configs[(*crunch_configs_size)].entropy_idx_ = i;
+ crunch_configs[(*crunch_configs_size)].palette_sorting_type_ =
+ typed_sorting_method;
+ ++*crunch_configs_size;
+ }
} else {
+ crunch_configs[(*crunch_configs_size)].entropy_idx_ = i;
crunch_configs[(*crunch_configs_size)].palette_sorting_type_ =
kUnusedPalette;
+ ++*crunch_configs_size;
}
- ++*crunch_configs_size;
}
}
} else {
@@ -1112,10 +820,10 @@ static int EncodeImageNoHuffman(VP8LBitWriter* const bw,
static int EncodeImageInternal(
VP8LBitWriter* const bw, const uint32_t* const argb,
VP8LHashChain* const hash_chain, VP8LBackwardRefs refs_array[4], int width,
- int height, int quality, int low_effort, int use_cache,
- const CrunchConfig* const config, int* cache_bits, int histogram_bits,
- size_t init_byte_position, int* const hdr_size, int* const data_size,
- const WebPPicture* const pic, int percent_range, int* const percent) {
+ int height, int quality, int low_effort, const CrunchConfig* const config,
+ int* cache_bits, int histogram_bits, size_t init_byte_position,
+ int* const hdr_size, int* const data_size, const WebPPicture* const pic,
+ int percent_range, int* const percent) {
const uint32_t histogram_image_xysize =
VP8LSubSampleSize(width, histogram_bits) *
VP8LSubSampleSize(height, histogram_bits);
@@ -1163,13 +871,9 @@ static int EncodeImageInternal(
percent_start += percent_range;
remaining_percent -= percent_range;
- if (use_cache) {
- // If the value is different from zero, it has been set during the
- // palette analysis.
- cache_bits_init = (*cache_bits == 0) ? MAX_COLOR_CACHE_BITS : *cache_bits;
- } else {
- cache_bits_init = 0;
- }
+ // If the value is different from zero, it has been set during the palette
+ // analysis.
+ cache_bits_init = (*cache_bits == 0) ? MAX_COLOR_CACHE_BITS : *cache_bits;
// If several iterations will happen, clone into bw_best.
if ((config->sub_configs_size_ > 1 || config->sub_configs_[0].do_no_cache_) &&
!VP8LBitWriterClone(bw, &bw_best)) {
@@ -1485,7 +1189,7 @@ static void ClearTransformBuffer(VP8LEncoder* const enc) {
// enc->use_predict_, enc->use_cross_color_
static int AllocateTransformBuffer(VP8LEncoder* const enc, int width,
int height) {
- const uint64_t image_size = width * height;
+ const uint64_t image_size = (uint64_t)width * height;
// VP8LResidualImage needs room for 2 scanlines of uint32 pixels with an extra
// pixel in each, plus 2 regular scanlines of bytes.
// TODO(skal): Clean up by using arithmetic in bytes instead of words.
@@ -1495,7 +1199,7 @@ static int AllocateTransformBuffer(VP8LEncoder* const enc, int width,
: 0;
const uint64_t transform_data_size =
(enc->use_predict_ || enc->use_cross_color_)
- ? VP8LSubSampleSize(width, enc->transform_bits_) *
+ ? (uint64_t)VP8LSubSampleSize(width, enc->transform_bits_) *
VP8LSubSampleSize(height, enc->transform_bits_)
: 0;
const uint64_t max_alignment_in_words =
@@ -1758,7 +1462,6 @@ typedef struct {
const WebPPicture* picture_;
VP8LBitWriter* bw_;
VP8LEncoder* enc_;
- int use_cache_;
CrunchConfig crunch_configs_[CRUNCH_CONFIGS_MAX];
int num_crunch_configs_;
int red_and_blue_always_zero_;
@@ -1771,7 +1474,6 @@ static int EncodeStreamHook(void* input, void* data2) {
const WebPPicture* const picture = params->picture_;
VP8LBitWriter* const bw = params->bw_;
VP8LEncoder* const enc = params->enc_;
- const int use_cache = params->use_cache_;
const CrunchConfig* const crunch_configs = params->crunch_configs_;
const int num_crunch_configs = params->num_crunch_configs_;
const int red_and_blue_always_zero = params->red_and_blue_always_zero_;
@@ -1845,19 +1547,11 @@ static int EncodeStreamHook(void* input, void* data2) {
// Encode palette
if (enc->use_palette_) {
- if (crunch_configs[idx].palette_sorting_type_ == kSortedDefault) {
- // Nothing to do, we have already sorted the palette.
- memcpy(enc->palette_, enc->palette_sorted_,
- enc->palette_size_ * sizeof(*enc->palette_));
- } else if (crunch_configs[idx].palette_sorting_type_ == kMinimizeDelta) {
- PaletteSortMinimizeDeltas(enc->palette_sorted_, enc->palette_size_,
- enc->palette_);
- } else {
- assert(crunch_configs[idx].palette_sorting_type_ == kModifiedZeng);
- if (!PaletteSortModifiedZeng(enc->pic_, enc->palette_sorted_,
- enc->palette_size_, enc->palette_)) {
- goto Error;
- }
+ if (!PaletteSort(crunch_configs[idx].palette_sorting_type_, enc->pic_,
+ enc->palette_sorted_, enc->palette_size_,
+ enc->palette_)) {
+ WebPEncodingSetError(enc->pic_, VP8_ENC_ERROR_OUT_OF_MEMORY);
+ goto Error;
}
percent_range = remaining_percent / 4;
if (!EncodePalette(bw, low_effort, enc, percent_range, &percent)) {
@@ -1867,7 +1561,7 @@ static int EncodeStreamHook(void* input, void* data2) {
if (!MapImageFromPalette(enc, use_delta_palette)) goto Error;
// If using a color cache, do not have it bigger than the number of
// colors.
- if (use_cache && enc->palette_size_ < (1 << MAX_COLOR_CACHE_BITS)) {
+ if (enc->palette_size_ < (1 << MAX_COLOR_CACHE_BITS)) {
enc->cache_bits_ = BitsLog2Floor(enc->palette_size_) + 1;
}
}
@@ -1911,7 +1605,7 @@ static int EncodeStreamHook(void* input, void* data2) {
// Encode and write the transformed image.
if (!EncodeImageInternal(
bw, enc->argb_, &enc->hash_chain_, enc->refs_, enc->current_width_,
- height, quality, low_effort, use_cache, &crunch_configs[idx],
+ height, quality, low_effort, &crunch_configs[idx],
&enc->cache_bits_, enc->histo_bits_, byte_position, &hdr_size,
&data_size, picture, remaining_percent, &percent)) {
goto Error;
@@ -1953,7 +1647,7 @@ static int EncodeStreamHook(void* input, void* data2) {
int VP8LEncodeStream(const WebPConfig* const config,
const WebPPicture* const picture,
- VP8LBitWriter* const bw_main, int use_cache) {
+ VP8LBitWriter* const bw_main) {
VP8LEncoder* const enc_main = VP8LEncoderNew(config, picture);
VP8LEncoder* enc_side = NULL;
CrunchConfig crunch_configs[CRUNCH_CONFIGS_MAX];
@@ -1975,7 +1669,9 @@ int VP8LEncodeStream(const WebPConfig* const config,
}
// Avoid "garbage value" error from Clang's static analysis tool.
- WebPPictureInit(&picture_side);
+ if (!WebPPictureInit(&picture_side)) {
+ goto Error;
+ }
// Analyze image (entropy, num_palettes etc)
if (!EncoderAnalyze(enc_main, crunch_configs, &num_crunch_configs_main,
@@ -2010,7 +1706,6 @@ int VP8LEncodeStream(const WebPConfig* const config,
StreamEncodeContext* const param =
(idx == 0) ? &params_main : &params_side;
param->config_ = config;
- param->use_cache_ = use_cache;
param->red_and_blue_always_zero_ = red_and_blue_always_zero;
if (idx == 0) {
param->picture_ = picture;
@@ -2164,7 +1859,7 @@ int VP8LEncodeImage(const WebPConfig* const config,
if (!WebPReportProgress(picture, 2, &percent)) goto UserAbort;
// Encode main image stream.
- if (!VP8LEncodeStream(config, picture, &bw, 1 /*use_cache*/)) goto Error;
+ if (!VP8LEncodeStream(config, picture, &bw)) goto Error;
if (!WebPReportProgress(picture, 99, &percent)) goto UserAbort;
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-28 20:50:29 +0000