mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>pull/77/merge
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/*
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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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