Blame src/enc/webp_enc.c

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// Copyright 2011 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// WebP encoder: main entry point
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include "src/enc/cost_enc.h"
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#include "src/enc/vp8i_enc.h"
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#include "src/enc/vp8li_enc.h"
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#include "src/utils/utils.h"
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// #define PRINT_MEMORY_INFO
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#ifdef PRINT_MEMORY_INFO
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#include <stdio.h>
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#endif
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//------------------------------------------------------------------------------
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int WebPGetEncoderVersion(void) {
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  return (ENC_MAJ_VERSION << 16) | (ENC_MIN_VERSION << 8) | ENC_REV_VERSION;
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}
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//------------------------------------------------------------------------------
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// VP8Encoder
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//------------------------------------------------------------------------------
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static void ResetSegmentHeader(VP8Encoder* const enc) {
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  VP8EncSegmentHeader* const hdr = &enc->segment_hdr_;
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  hdr->num_segments_ = enc->config_->segments;
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  hdr->update_map_  = (hdr->num_segments_ > 1);
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  hdr->size_ = 0;
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}
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static void ResetFilterHeader(VP8Encoder* const enc) {
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  VP8EncFilterHeader* const hdr = &enc->filter_hdr_;
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  hdr->simple_ = 1;
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  hdr->level_ = 0;
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  hdr->sharpness_ = 0;
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  hdr->i4x4_lf_delta_ = 0;
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}
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static void ResetBoundaryPredictions(VP8Encoder* const enc) {
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  // init boundary values once for all
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  // Note: actually, initializing the preds_[] is only needed for intra4.
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  int i;
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  uint8_t* const top = enc->preds_ - enc->preds_w_;
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  uint8_t* const left = enc->preds_ - 1;
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  for (i = -1; i < 4 * enc->mb_w_; ++i) {
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    top[i] = B_DC_PRED;
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  }
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  for (i = 0; i < 4 * enc->mb_h_; ++i) {
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    left[i * enc->preds_w_] = B_DC_PRED;
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  }
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  enc->nz_[-1] = 0;   // constant
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}
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// Mapping from config->method_ to coding tools used.
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//-------------------+---+---+---+---+---+---+---+
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//   Method          | 0 | 1 | 2 | 3 |(4)| 5 | 6 |
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//-------------------+---+---+---+---+---+---+---+
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// fast probe        | x |   |   | x |   |   |   |
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//-------------------+---+---+---+---+---+---+---+
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// dynamic proba     | ~ | x | x | x | x | x | x |
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//-------------------+---+---+---+---+---+---+---+
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// fast mode analysis|[x]|[x]|   |   | x | x | x |
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//-------------------+---+---+---+---+---+---+---+
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// basic rd-opt      |   |   |   | x | x | x | x |
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//-------------------+---+---+---+---+---+---+---+
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// disto-refine i4/16| x | x | x |   |   |   |   |
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//-------------------+---+---+---+---+---+---+---+
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// disto-refine uv   |   | x | x |   |   |   |   |
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//-------------------+---+---+---+---+---+---+---+
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// rd-opt i4/16      |   |   | ~ | x | x | x | x |
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//-------------------+---+---+---+---+---+---+---+
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// token buffer (opt)|   |   |   | x | x | x | x |
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//-------------------+---+---+---+---+---+---+---+
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// Trellis           |   |   |   |   |   | x |Ful|
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//-------------------+---+---+---+---+---+---+---+
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// full-SNS          |   |   |   |   | x | x | x |
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//-------------------+---+---+---+---+---+---+---+
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static void MapConfigToTools(VP8Encoder* const enc) {
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  const WebPConfig* const config = enc->config_;
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  const int method = config->method;
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  const int limit = 100 - config->partition_limit;
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  enc->method_ = method;
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  enc->rd_opt_level_ = (method >= 6) ? RD_OPT_TRELLIS_ALL
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                     : (method >= 5) ? RD_OPT_TRELLIS
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                     : (method >= 3) ? RD_OPT_BASIC
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                     : RD_OPT_NONE;
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  enc->max_i4_header_bits_ =
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      256 * 16 * 16 *                 // upper bound: up to 16bit per 4x4 block
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      (limit * limit) / (100 * 100);  // ... modulated with a quadratic curve.
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  // partition0 = 512k max.
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  enc->mb_header_limit_ =
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      (score_t)256 * 510 * 8 * 1024 / (enc->mb_w_ * enc->mb_h_);
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  enc->thread_level_ = config->thread_level;
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  enc->do_search_ = (config->target_size > 0 || config->target_PSNR > 0);
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  if (!config->low_memory) {
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#if !defined(DISABLE_TOKEN_BUFFER)
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    enc->use_tokens_ = (enc->rd_opt_level_ >= RD_OPT_BASIC);  // need rd stats
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#endif
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    if (enc->use_tokens_) {
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      enc->num_parts_ = 1;   // doesn't work with multi-partition
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    }
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  }
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}
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// Memory scaling with dimensions:
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//  memory (bytes) ~= 2.25 * w + 0.0625 * w * h
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//
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// Typical memory footprint (614x440 picture)
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//              encoder: 22111
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//                 info: 4368
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//                preds: 17741
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//          top samples: 1263
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//             non-zero: 175
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//             lf-stats: 0
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//                total: 45658
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// Transient object sizes:
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//       VP8EncIterator: 3360
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//         VP8ModeScore: 872
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//       VP8SegmentInfo: 732
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//          VP8EncProba: 18352
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//              LFStats: 2048
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// Picture size (yuv): 419328
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static VP8Encoder* InitVP8Encoder(const WebPConfig* const config,
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                                  WebPPicture* const picture) {
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  VP8Encoder* enc;
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  const int use_filter =
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      (config->filter_strength > 0) || (config->autofilter > 0);
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  const int mb_w = (picture->width + 15) >> 4;
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  const int mb_h = (picture->height + 15) >> 4;
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  const int preds_w = 4 * mb_w + 1;
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  const int preds_h = 4 * mb_h + 1;
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  const size_t preds_size = preds_w * preds_h * sizeof(*enc->preds_);
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  const int top_stride = mb_w * 16;
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  const size_t nz_size = (mb_w + 1) * sizeof(*enc->nz_) + WEBP_ALIGN_CST;
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  const size_t info_size = mb_w * mb_h * sizeof(*enc->mb_info_);
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  const size_t samples_size =
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      2 * top_stride * sizeof(*enc->y_top_)  // top-luma/u/v
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      + WEBP_ALIGN_CST;                      // align all
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  const size_t lf_stats_size =
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      config->autofilter ? sizeof(*enc->lf_stats_) + WEBP_ALIGN_CST : 0;
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  const size_t top_derr_size =
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      (config->quality <= ERROR_DIFFUSION_QUALITY || config->pass > 1) ?
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          mb_w * sizeof(*enc->top_derr_) : 0;
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  uint8_t* mem;
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  const uint64_t size = (uint64_t)sizeof(*enc)   // main struct
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                      + WEBP_ALIGN_CST           // cache alignment
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                      + info_size                // modes info
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                      + preds_size               // prediction modes
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                      + samples_size             // top/left samples
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                      + top_derr_size            // top diffusion error
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                      + nz_size                  // coeff context bits
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                      + lf_stats_size;           // autofilter stats
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#ifdef PRINT_MEMORY_INFO
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  printf("===================================\n");
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  printf("Memory used:\n"
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         "             encoder: %ld\n"
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         "                info: %ld\n"
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         "               preds: %ld\n"
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         "         top samples: %ld\n"
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         "       top diffusion: %ld\n"
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         "            non-zero: %ld\n"
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         "            lf-stats: %ld\n"
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         "               total: %ld\n",
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         sizeof(*enc) + WEBP_ALIGN_CST, info_size,
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         preds_size, samples_size, top_derr_size, nz_size, lf_stats_size, size);
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  printf("Transient object sizes:\n"
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         "      VP8EncIterator: %ld\n"
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         "        VP8ModeScore: %ld\n"
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         "      VP8SegmentInfo: %ld\n"
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         "         VP8EncProba: %ld\n"
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         "             LFStats: %ld\n",
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         sizeof(VP8EncIterator), sizeof(VP8ModeScore),
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         sizeof(VP8SegmentInfo), sizeof(VP8EncProba),
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         sizeof(LFStats));
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  printf("Picture size (yuv): %ld\n",
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         mb_w * mb_h * 384 * sizeof(uint8_t));
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  printf("===================================\n");
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#endif
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  mem = (uint8_t*)WebPSafeMalloc(size, sizeof(*mem));
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  if (mem == NULL) {
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    WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
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    return NULL;
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  }
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  enc = (VP8Encoder*)mem;
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  mem = (uint8_t*)WEBP_ALIGN(mem + sizeof(*enc));
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  memset(enc, 0, sizeof(*enc));
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  enc->num_parts_ = 1 << config->partitions;
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  enc->mb_w_ = mb_w;
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  enc->mb_h_ = mb_h;
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  enc->preds_w_ = preds_w;
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  enc->mb_info_ = (VP8MBInfo*)mem;
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  mem += info_size;
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  enc->preds_ = mem + 1 + enc->preds_w_;
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  mem += preds_size;
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  enc->nz_ = 1 + (uint32_t*)WEBP_ALIGN(mem);
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  mem += nz_size;
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  enc->lf_stats_ = lf_stats_size ? (LFStats*)WEBP_ALIGN(mem) : NULL;
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  mem += lf_stats_size;
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  // top samples (all 16-aligned)
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  mem = (uint8_t*)WEBP_ALIGN(mem);
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  enc->y_top_ = mem;
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  enc->uv_top_ = enc->y_top_ + top_stride;
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  mem += 2 * top_stride;
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  enc->top_derr_ = top_derr_size ? (DError*)mem : NULL;
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  mem += top_derr_size;
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  assert(mem <= (uint8_t*)enc + size);
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  enc->config_ = config;
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  enc->profile_ = use_filter ? ((config->filter_type == 1) ? 0 : 1) : 2;
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  enc->pic_ = picture;
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  enc->percent_ = 0;
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  MapConfigToTools(enc);
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  VP8EncDspInit();
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  VP8DefaultProbas(enc);
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  ResetSegmentHeader(enc);
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  ResetFilterHeader(enc);
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  ResetBoundaryPredictions(enc);
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  VP8EncDspCostInit();
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  VP8EncInitAlpha(enc);
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  // lower quality means smaller output -> we modulate a little the page
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  // size based on quality. This is just a crude 1rst-order prediction.
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  {
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    const float scale = 1.f + config->quality * 5.f / 100.f;  // in [1,6]
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    VP8TBufferInit(&enc->tokens_, (int)(mb_w * mb_h * 4 * scale));
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  }
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  return enc;
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}
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static int DeleteVP8Encoder(VP8Encoder* enc) {
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  int ok = 1;
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  if (enc != NULL) {
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    ok = VP8EncDeleteAlpha(enc);
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    VP8TBufferClear(&enc->tokens_);
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    WebPSafeFree(enc);
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  }
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  return ok;
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}
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//------------------------------------------------------------------------------
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#if !defined(WEBP_DISABLE_STATS)
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static double GetPSNR(uint64_t err, uint64_t size) {
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  return (err > 0 && size > 0) ? 10. * log10(255. * 255. * size / err) : 99.;
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}
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static void FinalizePSNR(const VP8Encoder* const enc) {
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  WebPAuxStats* stats = enc->pic_->stats;
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  const uint64_t size = enc->sse_count_;
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  const uint64_t* const sse = enc->sse_;
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  stats->PSNR[0] = (float)GetPSNR(sse[0], size);
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  stats->PSNR[1] = (float)GetPSNR(sse[1], size / 4);
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  stats->PSNR[2] = (float)GetPSNR(sse[2], size / 4);
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  stats->PSNR[3] = (float)GetPSNR(sse[0] + sse[1] + sse[2], size * 3 / 2);
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  stats->PSNR[4] = (float)GetPSNR(sse[3], size);
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}
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#endif  // !defined(WEBP_DISABLE_STATS)
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static void StoreStats(VP8Encoder* const enc) {
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#if !defined(WEBP_DISABLE_STATS)
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  WebPAuxStats* const stats = enc->pic_->stats;
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  if (stats != NULL) {
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    int i, s;
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    for (i = 0; i < NUM_MB_SEGMENTS; ++i) {
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      stats->segment_level[i] = enc->dqm_[i].fstrength_;
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      stats->segment_quant[i] = enc->dqm_[i].quant_;
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      for (s = 0; s <= 2; ++s) {
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        stats->residual_bytes[s][i] = enc->residual_bytes_[s][i];
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      }
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    }
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    FinalizePSNR(enc);
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    stats->coded_size = enc->coded_size_;
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    for (i = 0; i < 3; ++i) {
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      stats->block_count[i] = enc->block_count_[i];
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    }
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  }
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#else  // defined(WEBP_DISABLE_STATS)
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  WebPReportProgress(enc->pic_, 100, &enc->percent_);  // done!
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#endif  // !defined(WEBP_DISABLE_STATS)
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}
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int WebPEncodingSetError(const WebPPicture* const pic,
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                         WebPEncodingError error) {
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  assert((int)error < VP8_ENC_ERROR_LAST);
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  assert((int)error >= VP8_ENC_OK);
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  ((WebPPicture*)pic)->error_code = error;
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  return 0;
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}
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int WebPReportProgress(const WebPPicture* const pic,
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                       int percent, int* const percent_store) {
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  if (percent_store != NULL && percent != *percent_store) {
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    *percent_store = percent;
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    if (pic->progress_hook && !pic->progress_hook(percent, pic)) {
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      // user abort requested
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      WebPEncodingSetError(pic, VP8_ENC_ERROR_USER_ABORT);
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      return 0;
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    }
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  }
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  return 1;  // ok
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}
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//------------------------------------------------------------------------------
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int WebPEncode(const WebPConfig* config, WebPPicture* pic) {
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  int ok = 0;
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  if (pic == NULL) return 0;
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  WebPEncodingSetError(pic, VP8_ENC_OK);  // all ok so far
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  if (config == NULL) {  // bad params
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    return WebPEncodingSetError(pic, VP8_ENC_ERROR_NULL_PARAMETER);
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  }
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  if (!WebPValidateConfig(config)) {
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    return WebPEncodingSetError(pic, VP8_ENC_ERROR_INVALID_CONFIGURATION);
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  }
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  if (pic->width <= 0 || pic->height <= 0) {
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    return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION);
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  }
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  if (pic->width > WEBP_MAX_DIMENSION || pic->height > WEBP_MAX_DIMENSION) {
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    return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION);
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  }
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  if (pic->stats != NULL) memset(pic->stats, 0, sizeof(*pic->stats));
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  if (!config->lossless) {
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    VP8Encoder* enc = NULL;
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    if (pic->use_argb || pic->y == NULL || pic->u == NULL || pic->v == NULL) {
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      // Make sure we have YUVA samples.
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      if (config->use_sharp_yuv || (config->preprocessing & 4)) {
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        if (!WebPPictureSharpARGBToYUVA(pic)) {
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          return 0;
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        }
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      } else {
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        float dithering = 0.f;
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        if (config->preprocessing & 2) {
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          const float x = config->quality / 100.f;
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          const float x2 = x * x;
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          // slowly decreasing from max dithering at low quality (q->0)
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          // to 0.5 dithering amplitude at high quality (q->100)
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          dithering = 1.0f + (0.5f - 1.0f) * x2 * x2;
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        }
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        if (!WebPPictureARGBToYUVADithered(pic, WEBP_YUV420, dithering)) {
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          return 0;
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        }
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      }
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    }
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    if (!config->exact) {
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      WebPCleanupTransparentArea(pic);
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    }
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    enc = InitVP8Encoder(config, pic);
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    if (enc == NULL) return 0;  // pic->error is already set.
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    // Note: each of the tasks below account for 20% in the progress report.
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    ok = VP8EncAnalyze(enc);
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    // Analysis is done, proceed to actual coding.
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    ok = ok && VP8EncStartAlpha(enc);   // possibly done in parallel
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    if (!enc->use_tokens_) {
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      ok = ok && VP8EncLoop(enc);
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    } else {
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      ok = ok && VP8EncTokenLoop(enc);
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    }
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    ok = ok && VP8EncFinishAlpha(enc);
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    ok = ok && VP8EncWrite(enc);
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    StoreStats(enc);
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    if (!ok) {
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      VP8EncFreeBitWriters(enc);
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    }
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    ok &= DeleteVP8Encoder(enc);  // must always be called, even if !ok
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  } else {
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    // Make sure we have ARGB samples.
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    if (pic->argb == NULL && !WebPPictureYUVAToARGB(pic)) {
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      return 0;
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    }
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    if (!config->exact) {
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      WebPCleanupTransparentAreaLossless(pic);
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    }
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    ok = VP8LEncodeImage(config, pic);  // Sets pic->error in case of problem.
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  }
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  return ok;
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}