yuv2rgb_2_c_template(SwsContext *c, const int16_t *buf[2],
                     const int16_t *ubuf[2], const int16_t *vbuf[2],
                     const int16_t *abuf[2], uint8_t *dest, int dstW,
                     int yalpha, int uvalpha, int y,
                     enum PixelFormat target, int hasAlpha)
{
    const int16_t *buf0  = buf[0],  *buf1  = buf[1],
                  *ubuf0 = ubuf[0], *ubuf1 = ubuf[1],
                  *vbuf0 = vbuf[0], *vbuf1 = vbuf[1],
                  *abuf0 = hasAlpha ? abuf[0] : NULL,
                  *abuf1 = hasAlpha ? abuf[1] : NULL;
    int  yalpha1 = 4095 - yalpha;
    int uvalpha1 = 4095 - uvalpha;
    int i;
    for (i = 0; i < (dstW >> 1); i++) {
        int Y1 = (buf0[i * 2]     * yalpha1  + buf1[i * 2]     * yalpha)  >> 19;
        int Y2 = (buf0[i * 2 + 1] * yalpha1  + buf1[i * 2 + 1] * yalpha)  >> 19;
        int U  = (ubuf0[i]        * uvalpha1 + ubuf1[i]        * uvalpha) >> 19;
        int V  = (vbuf0[i]        * uvalpha1 + vbuf1[i]        * uvalpha) >> 19;
        int A1, A2;
        const void *r =  c->table_rV[V],
                   *g = (c->table_gU[U] + c->table_gV[V]),
                   *b =  c->table_bU[U];
        if (hasAlpha) {
            A1 = (abuf0[i * 2    ] * yalpha1 + abuf1[i * 2    ] * yalpha) >> 19;
            A2 = (abuf0[i * 2 + 1] * yalpha1 + abuf1[i * 2 + 1] * yalpha) >> 19;
        }
        yuv2rgb_write(dest, i, Y1, Y2, hasAlpha ? A1 : 0, hasAlpha ? A2 : 0,
                      r, g, b, y, target, hasAlpha);
    }
}