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

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};

//------------------------------------------------------------------------------
// helper functions for residuals struct VP8Residual.

void VP8InitResidual(int first, int coeff_type,
                     VP8Encoder* const enc, VP8Residual* const res) {
  res->coeff_type = coeff_type;
  res->prob  = enc->proba_.coeffs_[coeff_type];
  res->stats = enc->proba_.stats_[coeff_type];
  res->cost  = enc->proba_.level_cost_[coeff_type];
  res->costs = enc->proba_.remapped_costs_[coeff_type];
  res->first = first;
}

//------------------------------------------------------------------------------
// Mode costs

int VP8GetCostLuma4(VP8EncIterator* const it, const int16_t levels[16]) {
  const int x = (it->i4_ & 3), y = (it->i4_ >> 2);
  VP8Residual res;
  VP8Encoder* const enc = it->enc_;
  int R = 0;
  int ctx;

  VP8InitResidual(0, 3, enc, &res);
  ctx = it->top_nz_[x] + it->left_nz_[y];
  VP8SetResidualCoeffs(levels, &res);
  R += VP8GetResidualCost(ctx, &res);
  return R;
}

int VP8GetCostLuma16(VP8EncIterator* const it, const VP8ModeScore* const rd) {
  VP8Residual res;
  VP8Encoder* const enc = it->enc_;
  int x, y;
  int R = 0;

  VP8IteratorNzToBytes(it);   // re-import the non-zero context

  // DC
  VP8InitResidual(0, 1, enc, &res);
  VP8SetResidualCoeffs(rd->y_dc_levels, &res);
  R += VP8GetResidualCost(it->top_nz_[8] + it->left_nz_[8], &res);

  // AC
  VP8InitResidual(1, 0, enc, &res);
  for (y = 0; y < 4; ++y) {
    for (x = 0; x < 4; ++x) {
      const int ctx = it->top_nz_[x] + it->left_nz_[y];
      VP8SetResidualCoeffs(rd->y_ac_levels[x + y * 4], &res);
      R += VP8GetResidualCost(ctx, &res);