/*

 * Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include "swscale_internal.h"

void ff_hyscale_fast_c(SwsInternal *c, int16_t *dst, int dstWidth,

                           const uint8_t *src, int srcW, int xInc)

{

    int i;

    unsigned int xpos = 0;

    for (i = 0; i < dstWidth; i++) {

        register unsigned int xx     = xpos >> 16;

        register unsigned int xalpha = (xpos & 0xFFFF) >> 9;

        dst[i] = (src[xx] << 7) + (src[xx + 1] - src[xx]) * xalpha;

        xpos  += xInc;

    }

    for (i=dstWidth-1; (i*xInc)>>16 >=srcW-1; i--)

        dst[i] = src[srcW-1]*128;

}

void ff_hcscale_fast_c(SwsInternal *c, int16_t *dst1, int16_t *dst2,

                           int dstWidth, const uint8_t *src1,

                           const uint8_t *src2, int srcW, int xInc)

{

    int i;

    unsigned int xpos = 0;

    for (i = 0; i < dstWidth; i++) {

        register unsigned int xx     = xpos >> 16;

        register unsigned int xalpha = (xpos & 0xFFFF) >> 9;

        dst1[i] = (src1[xx] * (xalpha ^ 127) + src1[xx + 1] * xalpha);

        dst2[i] = (src2[xx] * (xalpha ^ 127) + src2[xx + 1] * xalpha);

        xpos   += xInc;

    }

    for (i=dstWidth-1; (i*xInc)>>16 >=srcW-1; i--) {

        dst1[i] = src1[srcW-1]*128;

        dst2[i] = src2[srcW-1]*128;

    }

}