libavcodec/vp6dsp.c

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#include "libavutil/common.h"
#include "vp56dsp.h"


void ff_vp6_filter_diag4_c(uint8_t *dst, uint8_t *src, int stride,
                           const int16_t *h_weights, const int16_t *v_weights)
{
    int x, y;
    int tmp[8*11];
    int *t = tmp;

    src -= stride;

    for (y=0; y<11; y++) {
        for (x=0; x<8; x++) {
            t[x] = av_clip_uint8((  src[x-1] * h_weights[0]
                               + src[x  ] * h_weights[1]
                               + src[x+1] * h_weights[2]
                               + src[x+2] * h_weights[3] + 64) >> 7);
        }
        src += stride;
        t += 8;
    }

    t = tmp + 8;
    for (y=0; y<8; y++) {
        for (x=0; x<8; x++) {
            dst[x] = av_clip_uint8((  t[x-8 ] * v_weights[0]
                                 + t[x   ] * v_weights[1]
                                 + t[x+8 ] * v_weights[2]
                                 + t[x+16] * v_weights[3] + 64) >> 7);
        }
        dst += stride;
        t += 8;
    }
}

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