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 <assert.h>
23
24#include "bit_depth_template.c"
25void FUNC(ff_emulated_edge_mc)(uint8_t *buf, const uint8_t *src,
26                               ptrdiff_t buf_linesize,
27                               ptrdiff_t src_linesize,
28                               int block_w, int block_h,
29                               int src_x, int src_y, int w, int h)
30{
31    int x, y;
32    int start_y, start_x, end_y, end_x;
33
34    if (!w || !h)
35        return;
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