static av_always_inline void
yuv2rgb_full_X_c_template(SwsContext *c, const int16_t *lumFilter,
                          const int16_t **lumSrc, int lumFilterSize,
                          const int16_t *chrFilter, const int16_t **chrUSrc,
                          const int16_t **chrVSrc, int chrFilterSize,
                          const int16_t **alpSrc, uint8_t *dest,
                          int dstW, int y, enum AVPixelFormat target, int hasAlpha)
{
    int i;
    int step = (target == AV_PIX_FMT_RGB24 || target == AV_PIX_FMT_BGR24) ? 3 : 4;
    int err[4] = {0};

    if(   target == AV_PIX_FMT_BGR4_BYTE || target == AV_PIX_FMT_RGB4_BYTE
       || target == AV_PIX_FMT_BGR8      || target == AV_PIX_FMT_RGB8)
        step = 1;

    for (i = 0; i < dstW; i++) {
        int j;
        int Y = 1<<9;
        int U = (1<<9)-(128 << 19);
        int V = (1<<9)-(128 << 19);
        int A;

        for (j = 0; j < lumFilterSize; j++) {
            Y += lumSrc[j][i] * lumFilter[j];
        }
        for (j = 0; j < chrFilterSize; j++) {
            U += chrUSrc[j][i] * chrFilter[j];
            V += chrVSrc[j][i] * chrFilter[j];
        }
        Y >>= 10;
        U >>= 10;
        V >>= 10;
        if (hasAlpha) {
            A = 1 << 18;
            for (j = 0; j < lumFilterSize; j++) {
                A += alpSrc[j][i] * lumFilter[j];
            }
            A >>= 19;
            if (A & 0x100)
                A = av_clip_uint8(A);
        }
        yuv2rgb_write_full(c, dest, i, Y, A, U, V, y, target, hasAlpha, err);
        dest += step;
    }
    c->dither_error[0][i] = err[0];
    c->dither_error[1][i] = err[1];
    c->dither_error[2][i] = err[2];
}