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  1. /*
  2.  * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
  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. /**
  22.  * @file
  23.  * VP6 DSP-oriented functions
  24.  */
  25.  
  26. #include "libavutil/common.h"
  27. #include "vp56dsp.h"
  28.  
  29.  
  30. void ff_vp6_filter_diag4_c(uint8_t *dst, uint8_t *src, int stride,
  31.                            const int16_t *h_weights, const int16_t *v_weights)
  32. {
  33.     int x, y;
  34.     int tmp[8*11];
  35.     int *t = tmp;
  36.  
  37.     src -= stride;
  38.  
  39.     for (y=0; y<11; y++) {
  40.         for (x=0; x<8; x++) {
  41.             t[x] = av_clip_uint8((  src[x-1] * h_weights[0]
  42.                                + src[x  ] * h_weights[1]
  43.                                + src[x+1] * h_weights[2]
  44.                                + src[x+2] * h_weights[3] + 64) >> 7);
  45.         }
  46.         src += stride;
  47.         t += 8;
  48.     }
  49.  
  50.     t = tmp + 8;
  51.     for (y=0; y<8; y++) {
  52.         for (x=0; x<8; x++) {
  53.             dst[x] = av_clip_uint8((  t[x-8 ] * v_weights[0]
  54.                                  + t[x   ] * v_weights[1]
  55.                                  + t[x+8 ] * v_weights[2]
  56.                                  + t[x+16] * v_weights[3] + 64) >> 7);
  57.         }
  58.         dst += stride;
  59.         t += 8;
  60.     }
  61. }
  62.