1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#include "config.h"
20#include "libavutil/attributes.h"
21#include "libavutil/common.h"
22#include "mpegvideodsp.h"
23
24static void gmc1_c(uint8_t *dst, uint8_t *src, int stride, int h,
25                   int x16, int y16, int rounder)
26{
27    const int A = (16 - x16) * (16 - y16);
28    const int B = (x16)      * (16 - y16);
29    const int C = (16 - x16) * (y16);
30    const int D = (x16)      * (y16);
31    int i;
32
33    for (i = 0; i < h; i++) {
34        dst[0] = (A * src[0] + B * src[1] + C * src[stride + 0] + D * src[stride + 1] + rounder) >> 8;
35        dst[1] = (A * src[1] + B * src[2] + C * src[stride + 1] + D * src[stride + 2] + rounder) >> 8;
36        dst[2] = (A * src[2] + B * src[3] + C * src[stride + 2] + D * src[stride + 3] + rounder) >> 8;
37        dst[3] = (A * src[3] + B * src[4] + C * src[stride + 3] + D * src[stride + 4] + rounder) >> 8;
38        dst[4] = (A * src[4] + B * src[5] + C * src[stride + 4] + D * src[stride + 5] + rounder) >> 8;
39        dst[5] = (A * src[5] + B * src[6] + C * src[stride + 5] + D * src[stride + 6] + rounder) >> 8;
40        dst[6] = (A * src[6] + B * src[7] + C * src[stride + 6] + D * src[stride + 7] + rounder) >> 8;
41        dst[7] = (A * src[7] + B * src[8] + C * src[stride + 7] + D * src[stride + 8] + rounder) >> 8;
42        dst   += stride;
43        src   += stride;
44    }
45}
46
47void ff_gmc_c(uint8_t *dst, uint8_t *src, int stride, int h, int ox, int oy,
48              int dxx, int dxy, int dyx, int dyy, int shift, int r,
49              int width, int height)
50{
51    int y, vx, vy;
52    const int s = 1 << shift;
53
54    width--;
55    height--;
56
57    for (y = 0; y < h; y++) {
58        int x;
59
60        vx = ox;
61        vy = oy;
62        for (x = 0; x < 8; x++) { // FIXME: optimize
63            int index;
64            int src_x  = vx >> 16;
65            int src_y  = vy >> 16;
66            int frac_x = src_x & (s - 1);
67            int frac_y = src_y & (s - 1);
68
69            src_x >>= shift;
70            src_y >>= shift;
71
72            if ((unsigned) src_x < width) {
73                if ((unsigned) src_y < height) {
74                    index = src_x + src_y * stride;
75                    dst[y * stride + x] =
76                        ((src[index]                        * (s - frac_x) +
77                          src[index + 1]          * frac_x) * (s - frac_y) +
78                         (src[index + stride]               * (s - frac_x) +
79                          src[index + stride + 1] * frac_x) *      frac_y  +
80                         r) >> (shift * 2);
81                } else {
82                    index = src_x + av_clip(src_y, 0, height) * stride;
83                    dst[y * stride + x] =
84                        ((src[index]               * (s - frac_x) +
85                          src[index + 1] * frac_x) *  s           +
86                         r) >> (shift * 2);
87                }
88            } else {
89                if ((unsigned) src_y < height) {
90                    index = av_clip(src_x, 0, width) + src_y * stride;
91                    dst[y * stride + x] =
92                        ((src[index]                    * (s - frac_y) +
93                          src[index + stride] * frac_y) *  s           +
94                         r) >> (shift * 2);
95                } else {
96                    index = av_clip(src_x, 0, width) +
97                            av_clip(src_y, 0, height) * stride;
98                    dst[y * stride + x] = src[index];
99                }
100            }
101
102            vx += dxx;
103            vy += dyx;
104        }
105        ox += dxy;
106        oy += dyy;
107    }
108}
109
110av_cold void ff_mpegvideodsp_init(MpegVideoDSPContext *c)
111{
112    c->gmc1 = gmc1_c;
113    c->gmc  = ff_gmc_c;
114
115    if (ARCH_PPC)
116        ff_mpegvideodsp_init_ppc(c);
117    if (ARCH_X86)
118        ff_mpegvideodsp_init_x86(c);
119}
120