text: /*
   *  Copyright (c) 2010 The VP8 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 "invtrans.h"
  
  
  
  static void recon_dcblock(MACROBLOCKD *x)
  {
      BLOCKD *b = &x->block[24];
      int i;
  
      for (i = 0; i < 16; i++)
      {
          x->block[i].dqcoeff[0] = b->diff[i];
      }
  
  }
  
  void vp8_inverse_transform_b(const vp8_idct_rtcd_vtable_t *rtcd, BLOCKD *b, int pitch)
  {
      if (b->eob > 1)
          IDCT_INVOKE(rtcd, idct16)(b->dqcoeff, b->diff, pitch);
      else
          IDCT_INVOKE(rtcd, idct1)(b->dqcoeff, b->diff, pitch);
  }
  
  
  void vp8_inverse_transform_mby(const vp8_idct_rtcd_vtable_t *rtcd, MACROBLOCKD *x)
  {
      int i;
  
      // do 2nd order transform on the dc block
      IDCT_INVOKE(rtcd, iwalsh16)(x->block[24].dqcoeff, x->block[24].diff);
  
      recon_dcblock(x);
  
      for (i = 0; i < 16; i++)
      {
          vp8_inverse_transform_b(rtcd, &x->block[i], 32);
      }
  
  }
  void vp8_inverse_transform_mbuv(const vp8_idct_rtcd_vtable_t *rtcd, MACROBLOCKD *x)
  {
      int i;
  
      for (i = 16; i < 24; i++)
      {
          vp8_inverse_transform_b(rtcd, &x->block[i], 16);
      }
  
  }
  
  
  void vp8_inverse_transform_mb(const vp8_idct_rtcd_vtable_t *rtcd, MACROBLOCKD *x)
  {
      int i;
  
      if (x->mbmi.mode != B_PRED && x->mbmi.mode != SPLITMV)
      {
          // do 2nd order transform on the dc block
  
          IDCT_INVOKE(rtcd, iwalsh16)(&x->block[24].dqcoeff[0], x->block[24].diff);
          recon_dcblock(x);
      }
  
      for (i = 0; i < 16; i++)
      {
          vp8_inverse_transform_b(rtcd, &x->block[i], 32);
      }
  
  
      for (i = 16; i < 24; i++)
      {
          vp8_inverse_transform_b(rtcd, &x->block[i], 16);
      }
  
  }
  