1 /*
2 * Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "swscale_internal.h"
22
ff_hyscale_fast_c(SwsContext * c,int16_t * dst,int dstWidth,const uint8_t * src,int srcW,int xInc)23 void ff_hyscale_fast_c(SwsContext *c, int16_t *dst, int dstWidth,
24 const uint8_t *src, int srcW, int xInc)
25 {
26 int i;
27 unsigned int xpos = 0;
28 for (i = 0; i < dstWidth; i++) {
29 register unsigned int xx = xpos >> 16;
30 register unsigned int xalpha = (xpos & 0xFFFF) >> 9;
31 dst[i] = (src[xx] << 7) + (src[xx + 1] - src[xx]) * xalpha;
32 xpos += xInc;
33 }
34 for (i=dstWidth-1; (i*xInc)>>16 >=srcW-1; i--)
35 dst[i] = src[srcW-1]*128;
36 }
37
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)38 void ff_hcscale_fast_c(SwsContext *c, int16_t *dst1, int16_t *dst2,
39 int dstWidth, const uint8_t *src1,
40 const uint8_t *src2, int srcW, int xInc)
41 {
42 int i;
43 unsigned int xpos = 0;
44 for (i = 0; i < dstWidth; i++) {
45 register unsigned int xx = xpos >> 16;
46 register unsigned int xalpha = (xpos & 0xFFFF) >> 9;
47 dst1[i] = (src1[xx] * (xalpha ^ 127) + src1[xx + 1] * xalpha);
48 dst2[i] = (src2[xx] * (xalpha ^ 127) + src2[xx + 1] * xalpha);
49 xpos += xInc;
50 }
51 for (i=dstWidth-1; (i*xInc)>>16 >=srcW-1; i--) {
52 dst1[i] = src1[srcW-1]*128;
53 dst2[i] = src2[srcW-1]*128;
54 }
55 }
56