libavcodec/videodsp_template.c

   1 /*
   2  * Copyright (c) 2002-2004 Michael Niedermayer
   3  * Copyright (C) 2012 Ronald S. Bultje
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include <assert.h>
  23
  24 #include "bit_depth_template.c"
  25
  26 static void FUNC(ff_emulated_edge_mc)(uint8_t *buf, const uint8_t *src,
  27                                       ptrdiff_t buf_linesize,
  28                                       ptrdiff_t src_linesize,
  29                                       int block_w, int block_h,
  30                                       int src_x, int src_y, int w, int h)
  31 {
  32     int x, y;
  33     int start_y, start_x, end_y, end_x;
  34
  35     if (src_y >= h) {
  36         src  += (h - 1 - src_y) * src_linesize;
  37         src_y = h - 1;
  38     } else if (src_y <= -block_h) {
  39         src  += (1 - block_h - src_y) * src_linesize;
  40         src_y = 1 - block_h;
  41     }
  42     if (src_x >= w) {
  43         src  += (w - 1 - src_x) * sizeof(pixel);
  44         src_x = w - 1;
  45     } else if (src_x <= -block_w) {
  46         src  += (1 - block_w - src_x) * sizeof(pixel);
  47         src_x = 1 - block_w;
  48     }
  49
  50     start_y = FFMAX(0, -src_y);
  51     start_x = FFMAX(0, -src_x);
  52     end_y = FFMIN(block_h, h-src_y);
  53     end_x = FFMIN(block_w, w-src_x);
  54     assert(start_y < end_y && block_h);
  55     assert(start_x < end_x && block_w);
  56
  57     w    = end_x - start_x;
  58     src += start_y * src_linesize + start_x * sizeof(pixel);
  59     buf += start_x * sizeof(pixel);
  60
  61     // top
  62     for (y = 0; y < start_y; y++) {
  63         memcpy(buf, src, w * sizeof(pixel));
  64         buf += buf_linesize;
  65     }
  66
  67     // copy existing part
  68     for (; y < end_y; y++) {
  69         memcpy(buf, src, w * sizeof(pixel));
  70         src += src_linesize;
  71         buf += buf_linesize;
  72     }
  73
  74     // bottom
  75     src -= src_linesize;
  76     for (; y < block_h; y++) {
  77         memcpy(buf, src, w * sizeof(pixel));
  78         buf += buf_linesize;
  79     }
  80
  81     buf -= block_h * buf_linesize + start_x * sizeof(pixel);
  82     while (block_h--) {
  83         pixel *bufp = (pixel *) buf;
  84
  85         // left
  86         for(x = 0; x < start_x; x++) {
  87             bufp[x] = bufp[start_x];
  88         }
  89
  90         // right
  91         for (x = end_x; x < block_w; x++) {
  92             bufp[x] = bufp[end_x - 1];
  93         }
  94         buf += buf_linesize;
  95     }
  96 }