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src/Source/LibWebP/src/enc/enc.alpha.c  view on Meta::CPAN

  const WebPConfig* config = enc->config_;
  uint8_t* alpha_data = NULL;
  size_t alpha_size = 0;
  const int effort_level = config->method;  // maps to [0..6]
  const WEBP_FILTER_TYPE filter =
      (config->alpha_filtering == 0) ? WEBP_FILTER_NONE :
      (config->alpha_filtering == 1) ? WEBP_FILTER_FAST :
                                       WEBP_FILTER_BEST;
  if (!EncodeAlpha(enc, config->alpha_quality, config->alpha_compression,
                   filter, effort_level, &alpha_data, &alpha_size)) {
    return 0;
  }
  if (alpha_size != (uint32_t)alpha_size) {  // Sanity check.
    WebPSafeFree(alpha_data);
    return 0;
  }
  enc->alpha_data_size_ = (uint32_t)alpha_size;
  enc->alpha_data_ = alpha_data;
  (void)dummy;
  return 1;
}

void VP8EncInitAlpha(VP8Encoder* const enc) {
  WebPInitAlphaProcessing();
  enc->has_alpha_ = WebPPictureHasTransparency(enc->pic_);
  enc->alpha_data_ = NULL;
  enc->alpha_data_size_ = 0;
  if (enc->thread_level_ > 0) {
    WebPWorker* const worker = &enc->alpha_worker_;
    WebPGetWorkerInterface()->Init(worker);
    worker->data1 = enc;
    worker->data2 = NULL;
    worker->hook = (WebPWorkerHook)CompressAlphaJob;
  }
}

int VP8EncStartAlpha(VP8Encoder* const enc) {
  if (enc->has_alpha_) {
    if (enc->thread_level_ > 0) {
      WebPWorker* const worker = &enc->alpha_worker_;
      // Makes sure worker is good to go.
      if (!WebPGetWorkerInterface()->Reset(worker)) {
        return 0;
      }
      WebPGetWorkerInterface()->Launch(worker);
      return 1;
    } else {
      return CompressAlphaJob(enc, NULL);   // just do the job right away
    }
  }
  return 1;
}

int VP8EncFinishAlpha(VP8Encoder* const enc) {
  if (enc->has_alpha_) {
    if (enc->thread_level_ > 0) {
      WebPWorker* const worker = &enc->alpha_worker_;
      if (!WebPGetWorkerInterface()->Sync(worker)) return 0;  // error
    }
  }
  return WebPReportProgress(enc->pic_, enc->percent_ + 20, &enc->percent_);
}

int VP8EncDeleteAlpha(VP8Encoder* const enc) {
  int ok = 1;
  if (enc->thread_level_ > 0) {
    WebPWorker* const worker = &enc->alpha_worker_;
    // finish anything left in flight
    ok = WebPGetWorkerInterface()->Sync(worker);
    // still need to end the worker, even if !ok
    WebPGetWorkerInterface()->End(worker);
  }
  WebPSafeFree(enc->alpha_data_);
  enc->alpha_data_ = NULL;
  enc->alpha_data_size_ = 0;
  enc->has_alpha_ = 0;
  return ok;
}