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https://github.com/FFmpeg/FFmpeg.git
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56 lines
2.0 KiB
C
56 lines
2.0 KiB
C
/*
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* Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "swscale_internal.h"
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void ff_hyscale_fast_c(SwsContext *c, int16_t *dst, int dstWidth,
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const uint8_t *src, int srcW, int xInc)
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{
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int i;
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unsigned int xpos = 0;
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for (i = 0; i < dstWidth; i++) {
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register unsigned int xx = xpos >> 16;
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register unsigned int xalpha = (xpos & 0xFFFF) >> 9;
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dst[i] = (src[xx] << 7) + (src[xx + 1] - src[xx]) * xalpha;
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xpos += xInc;
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}
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for (i=dstWidth-1; (i*xInc)>>16 >=srcW-1; i--)
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dst[i] = src[srcW-1]*128;
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}
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void ff_hcscale_fast_c(SwsContext *c, int16_t *dst1, int16_t *dst2,
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int dstWidth, const uint8_t *src1,
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const uint8_t *src2, int srcW, int xInc)
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{
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int i;
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unsigned int xpos = 0;
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for (i = 0; i < dstWidth; i++) {
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register unsigned int xx = xpos >> 16;
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register unsigned int xalpha = (xpos & 0xFFFF) >> 9;
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dst1[i] = (src1[xx] * (xalpha ^ 127) + src1[xx + 1] * xalpha);
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dst2[i] = (src2[xx] * (xalpha ^ 127) + src2[xx + 1] * xalpha);
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xpos += xInc;
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}
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for (i=dstWidth-1; (i*xInc)>>16 >=srcW-1; i--) {
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dst1[i] = src1[srcW-1]*128;
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dst2[i] = src2[srcW-1]*128;
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}
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}
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