vpx/vp8/common/predict_rotated.c

/*
 *  Copyright (c) 2012 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.
 */

#if CONFIG_ROTATION
typedef struct
{
    int y;
    int x;
    unsigned long t;
} tap;

typedef struct
{
    tap pt[4];
} point_taps;

typedef struct
{
    point_taps pt[256];
} mb_taps;

mb_taps mt_8x8[] =
{
    #include "rotate2.h"
};

mb_taps mt[] =
{
    #include "rotate.h"
};

void predict_rotated_16x16(int rotation_index, unsigned char *src, int sp,
                           unsigned char *dst, int dp)
{
    int i, j, k, p = 0;

    for (i = 0; i < 16; i++, dst += dp)
    {
        for (j = 0; j < 16; j++, p++)
        {
            unsigned int sum = 32768;

            for (k = 0; k < 4; k++)
            {
                tap *tp = &mt[rotation_index].pt[p].pt[k];
                sum += src[tp->y * sp + tp->x] * tp->t;
            }
            sum >>= 16;
            dst[j] = sum;
        }
    }
}
void predict_rotated_8x8(int rotation_index, unsigned char *src, int sp,
                         unsigned char *dst, int dp)
{
    int i, j, k, p = 0;

    for (i = 0; i < 8; i++, dst += dp)
    {
        for (j = 0; j < 8; j++, p++)
        {
            unsigned int sum = 32768;

            for (k = 0; k < 4; k++)
            {
                tap *tp = &mt_8x8[rotation_index].pt[p].pt[k];
                sum += src[tp->y * sp + tp->x] * tp->t;
            }
            sum >>= 16;
            dst[j] = sum;
        }
    }
}
#endif