vpx/vp8/common/invtrans.c

/*
 *  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->mode_info_context->mbmi.mode != B_PRED &&
        x->mode_info_context->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);
    }

}