shithub: libvpx

ref: daefbf2a6f5a2a9334355845396fa5f2fdccbaa5
dir: /vp8/common/mbpitch.c/

/*
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include "blockd.h"

void vp8_setup_block_dptrs(MACROBLOCKD *x) {
  int r, c;

  for (r = 0; r < 4; ++r) {
    for (c = 0; c < 4; ++c) {
      x->block[r * 4 + c].predictor = x->predictor + r * 4 * 16 + c * 4;
    }
  }

  for (r = 0; r < 2; ++r) {
    for (c = 0; c < 2; ++c) {
      x->block[16 + r * 2 + c].predictor =
          x->predictor + 256 + r * 4 * 8 + c * 4;
    }
  }

  for (r = 0; r < 2; ++r) {
    for (c = 0; c < 2; ++c) {
      x->block[20 + r * 2 + c].predictor =
          x->predictor + 320 + r * 4 * 8 + c * 4;
    }
  }

  for (r = 0; r < 25; ++r) {
    x->block[r].qcoeff = x->qcoeff + r * 16;
    x->block[r].dqcoeff = x->dqcoeff + r * 16;
    x->block[r].eob = x->eobs + r;
  }
}

void vp8_build_block_doffsets(MACROBLOCKD *x) {
  int block;

  for (block = 0; block < 16; ++block) /* y blocks */
  {
    x->block[block].offset =
        (block >> 2) * 4 * x->dst.y_stride + (block & 3) * 4;
  }

  for (block = 16; block < 20; ++block) /* U and V blocks */
  {
    x->block[block + 4].offset = x->block[block].offset =
        ((block - 16) >> 1) * 4 * x->dst.uv_stride + (block & 1) * 4;
  }
}