/*

  * 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 buf_linesize,
                                ptrdiff_t src_linesize,

                                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;

 
     if (!w || !h)
         return;

     av_assert2(block_w * sizeof(pixel) <= FFABS(buf_linesize));
 

     if (src_y >= h) {

         src -= src_y * src_linesize;
         src += (h - 1) * src_linesize;

         src_y = h - 1;
     } else if (src_y <= -block_h) {

         src -= src_y * src_linesize;
         src += (1 - block_h) * src_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 * src_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 += buf_linesize;

     }
 
     // copy existing part
     for (; y < end_y; y++) {
         memcpy(buf, src, w * sizeof(pixel));

         src += src_linesize;
         buf += buf_linesize;

     }
 
     // bottom

     src -= src_linesize;

     for (; y < block_h; y++) {
         memcpy(buf, src, w * sizeof(pixel));

         buf += buf_linesize;

     }
 

     buf -= block_h * buf_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 += buf_linesize;

     }
 }