text: /*
   * Copyright (c) 2002-2012 Michael Niedermayer
   * Copyright (C) 2012 Ronald S. Bultje
   *
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #include "bit_depth_template.c"
  void FUNC(ff_emulated_edge_mc)(uint8_t *buf, const uint8_t *src,
                                        ptrdiff_t linesize_arg,
                                        int block_w, int block_h,
                                        int src_x, int src_y, int w, int h)
  {
      int x, y;
      int start_y, start_x, end_y, end_x;
      int linesize = linesize_arg;
  
      if (!w || !h)
          return;
  
      if (src_y >= h) {
          src -= src_y * linesize;
          src += (h - 1) * linesize;
          src_y = h - 1;
      } else if (src_y <= -block_h) {
          src -= src_y * linesize;
          src += (1 - block_h) * linesize;
          src_y = 1 - block_h;
      }
      if (src_x >= w) {
          src  += (w - 1 - src_x) * sizeof(pixel);
          src_x = w - 1;
      } else if (src_x <= -block_w) {
          src  += (1 - block_w - src_x) * sizeof(pixel);
          src_x = 1 - block_w;
      }
  
      start_y = FFMAX(0, -src_y);
      start_x = FFMAX(0, -src_x);
      end_y = FFMIN(block_h, h-src_y);
      end_x = FFMIN(block_w, w-src_x);
      av_assert2(start_y < end_y && block_h);
      av_assert2(start_x < end_x && block_w);
  
      w    = end_x - start_x;
      src += start_y * linesize + start_x * sizeof(pixel);
      buf += start_x * sizeof(pixel);
  
      // top
      for (y = 0; y < start_y; y++) {
          memcpy(buf, src, w * sizeof(pixel));
          buf += linesize;
      }
  
      // copy existing part
      for (; y < end_y; y++) {
          memcpy(buf, src, w * sizeof(pixel));
          src += linesize;
          buf += linesize;
      }
  
      // bottom
      src -= linesize;
      for (; y < block_h; y++) {
          memcpy(buf, src, w * sizeof(pixel));
          buf += linesize;
      }
  
      buf -= block_h * linesize + start_x * sizeof(pixel);
      while (block_h--) {
          pixel *bufp = (pixel *) buf;
  
          // left
          for(x = 0; x < start_x; x++) {
              bufp[x] = bufp[start_x];
          }
  
          // right
          for (x = end_x; x < block_w; x++) {
              bufp[x] = bufp[end_x - 1];
          }
          buf += linesize;
      }
  }
  