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  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.  
  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.  
  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.