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 "bit_depth_template.c"
23#if BIT_DEPTH != 8
24// ff_emulated_edge_mc_8 is used by the x86 MpegVideoDSP API.
25static
26#endif
27void FUNC(ff_emulated_edge_mc)(uint8_t *buf, const uint8_t *src,
28                               ptrdiff_t buf_linesize,
29                               ptrdiff_t src_linesize,
30                               int block_w, int block_h,
31                               int src_x, int src_y, int w, int h)
32{
33    int x, y;
34    int start_y, start_x, end_y, end_x;
35
36    if (!w || !h)
37        return;
38
39    av_assert2(block_w * sizeof(pixel) <= FFABS(buf_linesize));
40
41    if (src_y >= h) {
42        src -= src_y * src_linesize;
43        src += (h - 1) * src_linesize;
44        src_y = h - 1;
45    } else if (src_y <= -block_h) {
46        src -= src_y * src_linesize;
47        src += (1 - block_h) * src_linesize;
48        src_y = 1 - block_h;
49    }
50    if (src_x >= w) {
51        // The subtracted expression has an unsigned type and must thus not be negative
52        src  -= (1 + src_x - w) * sizeof(pixel);
53        src_x = w - 1;
54    } else if (src_x <= -block_w) {
55        src  += (1 - block_w - src_x) * sizeof(pixel);
56        src_x = 1 - block_w;
57    }
58
59    start_y = FFMAX(0, -src_y);
60    start_x = FFMAX(0, -src_x);
61    end_y = FFMIN(block_h, h-src_y);
62    end_x = FFMIN(block_w, w-src_x);
63    av_assert2(start_y < end_y && block_h);
64    av_assert2(start_x < end_x && block_w);
65
66    w    = end_x - start_x;
67    src += start_y * src_linesize + start_x * (ptrdiff_t)sizeof(pixel);
68    buf += start_x * sizeof(pixel);
69
70    // top
71    for (y = 0; y < start_y; y++) {
72        memcpy(buf, src, w * sizeof(pixel));
73        buf += buf_linesize;
74    }
75
76    // copy existing part
77    for (; y < end_y; y++) {
78        memcpy(buf, src, w * sizeof(pixel));
79        src += src_linesize;
80        buf += buf_linesize;
81    }
82
83    // bottom
84    src -= src_linesize;
85    for (; y < block_h; y++) {
86        memcpy(buf, src, w * sizeof(pixel));
87        buf += buf_linesize;
88    }
89
90    buf -= block_h * buf_linesize + start_x * (ptrdiff_t)sizeof(pixel);
91    while (block_h--) {
92        pixel *bufp = (pixel *) buf;
93
94        // left
95        for(x = 0; x < start_x; x++) {
96            bufp[x] = bufp[start_x];
97        }
98
99        // right
100        for (x = end_x; x < block_w; x++) {
101            bufp[x] = bufp[end_x - 1];
102        }
103        buf += buf_linesize;
104    }
105}
106