示例#1
0
// main entry point
int VP8EncAnalyze(VP8Encoder* const enc) {
  int ok = 1;
  const int do_segments =
      enc->config_->emulate_jpeg_size ||   // We need the complexity evaluation.
      (enc->segment_hdr_.num_segments_ > 1) ||
      (enc->method_ == 0);  // for method 0, we need preds_[] to be filled.
  if (do_segments) {
    const int last_row = enc->mb_h_;
    // We give a little more than a half work to the main thread.
    const int split_row = (9 * last_row + 15) >> 4;
    const int total_mb = last_row * enc->mb_w_;
#ifdef WEBP_USE_THREAD
    const int kMinSplitRow = 2;  // minimal rows needed for mt to be worth it
    const int do_mt = (enc->thread_level_ > 0) && (split_row >= kMinSplitRow);
#else
    const int do_mt = 0;
#endif
    SegmentJob main_job;
    if (do_mt) {
      SegmentJob side_job;
      // Note the use of '&' instead of '&&' because we must call the functions
      // no matter what.
      InitSegmentJob(enc, &main_job, 0, split_row);
      InitSegmentJob(enc, &side_job, split_row, last_row);
      // we don't need to call Reset() on main_job.worker, since we're calling
      // WebPWorkerExecute() on it
      ok &= WebPWorkerReset(&side_job.worker);
      // launch the two jobs in parallel
      if (ok) {
        WebPWorkerLaunch(&side_job.worker);
        WebPWorkerExecute(&main_job.worker);
        ok &= WebPWorkerSync(&side_job.worker);
        ok &= WebPWorkerSync(&main_job.worker);
      }
      WebPWorkerEnd(&side_job.worker);
      if (ok) MergeJobs(&side_job, &main_job);  // merge results together
    } else {
      // Even for single-thread case, we use the generic Worker tools.
      InitSegmentJob(enc, &main_job, 0, last_row);
      WebPWorkerExecute(&main_job.worker);
      ok &= WebPWorkerSync(&main_job.worker);
    }
    WebPWorkerEnd(&main_job.worker);
    if (ok) {
      enc->alpha_ = main_job.alpha / total_mb;
      enc->uv_alpha_ = main_job.uv_alpha / total_mb;
      AssignSegments(enc, main_job.alphas);
    }
  } else {   // Use only one default segment.
示例#2
0
int VP8EncDeleteAlpha(VP8Encoder* const enc) {
  int ok = 1;
  if (enc->thread_level_ > 0) {
    WebPWorker* const worker = &enc->alpha_worker_;
    ok = WebPWorkerSync(worker);  // finish anything left in flight
    WebPWorkerEnd(worker);  // still need to end the worker, even if !ok
  }
  free(enc->alpha_data_);
  enc->alpha_data_ = NULL;
  enc->alpha_data_size_ = 0;
  enc->has_alpha_ = 0;
  return ok;
}