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  1. /*
  2.  * Copyright (c) 2002-2012 Michael Niedermayer
  3.  * Copyright (C) 2012 Ronald S. Bultje
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "bit_depth_template.c"
  23. void FUNC(ff_emulated_edge_mc)(uint8_t *buf, const uint8_t *src,
  24.                                ptrdiff_t buf_linesize,
  25.                                ptrdiff_t src_linesize,
  26.                                int block_w, int block_h,
  27.                                int src_x, int src_y, int w, int h)
  28. {
  29.     int x, y;
  30.     int start_y, start_x, end_y, end_x;
  31.  
  32.     if (!w || !h)
  33.         return;
  34.  
  35.     av_assert2(block_w * sizeof(pixel) <= FFABS(buf_linesize));
  36.  
  37.     if (src_y >= h) {
  38.         src -= src_y * src_linesize;
  39.         src += (h - 1) * src_linesize;
  40.         src_y = h - 1;
  41.     } else if (src_y <= -block_h) {
  42.         src -= src_y * src_linesize;
  43.         src += (1 - block_h) * src_linesize;
  44.         src_y = 1 - block_h;
  45.     }
  46.     if (src_x >= w) {
  47.         src  += (w - 1 - src_x) * sizeof(pixel);
  48.         src_x = w - 1;
  49.     } else if (src_x <= -block_w) {
  50.         src  += (1 - block_w - src_x) * sizeof(pixel);
  51.         src_x = 1 - block_w;
  52.     }
  53.  
  54.     start_y = FFMAX(0, -src_y);
  55.     start_x = FFMAX(0, -src_x);
  56.     end_y = FFMIN(block_h, h-src_y);
  57.     end_x = FFMIN(block_w, w-src_x);
  58.     av_assert2(start_y < end_y && block_h);
  59.     av_assert2(start_x < end_x && block_w);
  60.  
  61.     w    = end_x - start_x;
  62.     src += start_y * src_linesize + start_x * sizeof(pixel);
  63.     buf += start_x * sizeof(pixel);
  64.  
  65.     // top
  66.     for (y = 0; y < start_y; y++) {
  67.         memcpy(buf, src, w * sizeof(pixel));
  68.         buf += buf_linesize;
  69.     }
  70.  
  71.     // copy existing part
  72.     for (; y < end_y; y++) {
  73.         memcpy(buf, src, w * sizeof(pixel));
  74.         src += src_linesize;
  75.         buf += buf_linesize;
  76.     }
  77.  
  78.     // bottom
  79.     src -= src_linesize;
  80.     for (; y < block_h; y++) {
  81.         memcpy(buf, src, w * sizeof(pixel));
  82.         buf += buf_linesize;
  83.     }
  84.  
  85.     buf -= block_h * buf_linesize + start_x * sizeof(pixel);
  86.     while (block_h--) {
  87.         pixel *bufp = (pixel *) buf;
  88.  
  89.         // left
  90.         for(x = 0; x < start_x; x++) {
  91.             bufp[x] = bufp[start_x];
  92.         }
  93.  
  94.         // right
  95.         for (x = end_x; x < block_w; x++) {
  96.             bufp[x] = bufp[end_x - 1];
  97.         }
  98.         buf += buf_linesize;
  99.     }
  100. }
  101.