mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-18 03:19:31 +02:00
56 lines
2.0 KiB
C
56 lines
2.0 KiB
C
|
/*
|
||
|
|
* 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(SwsContext *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(SwsContext *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;
|
||
|
|
}
|
||
|
|
}
|