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 "bit_depth_template.c"
  23
  24 static void FUNC(ff_emulated_edge_mc)(uint8_t *buf, const uint8_t *src,
  25                                       ptrdiff_t 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 (src_y >= h) {
  33         src  += (h - 1 - src_y) * linesize;
  34         src_y = h - 1;
  35     } else if (src_y <= -block_h) {
  36         src  += (1 - block_h - src_y) * linesize;
  37         src_y = 1 - block_h;
  38     }
  39     if (src_x >= w) {
  40         src  += (w - 1 - src_x) * sizeof(pixel);
  41         src_x = w - 1;
  42     } else if (src_x <= -block_w) {
  43         src  += (1 - block_w - src_x) * sizeof(pixel);
  44         src_x = 1 - block_w;
  45     }
  46
  47     start_y = FFMAX(0, -src_y);
  48     start_x = FFMAX(0, -src_x);
  49     end_y = FFMIN(block_h, h-src_y);
  50     end_x = FFMIN(block_w, w-src_x);
  51     assert(start_y < end_y && block_h);
  52     assert(start_x < end_x && block_w);
  53
  54     w    = end_x - start_x;
  55     src += start_y * linesize + start_x * sizeof(pixel);
  56     buf += start_x * sizeof(pixel);
  57
  58     // top
  59     for (y = 0; y < start_y; y++) {
  60         memcpy(buf, src, w * sizeof(pixel));
  61         buf += linesize;
  62     }
  63
  64     // copy existing part
  65     for (; y < end_y; y++) {
  66         memcpy(buf, src, w * sizeof(pixel));
  67         src += linesize;
  68         buf += linesize;
  69     }
  70
  71     // bottom
  72     src -= linesize;
  73     for (; y < block_h; y++) {
  74         memcpy(buf, src, w * sizeof(pixel));
  75         buf += linesize;
  76     }
  77
  78     buf -= block_h * linesize + start_x * sizeof(pixel);
  79     while (block_h--) {
  80         pixel *bufp = (pixel *) buf;
  81
  82         // left
  83         for(x = 0; x < start_x; x++) {
  84             bufp[x] = bufp[start_x];
  85         }
  86
  87         // right
  88         for (x = end_x; x < block_w; x++) {
  89             bufp[x] = bufp[end_x - 1];
  90         }
  91         buf += linesize;
  92     }
  93 }