1 : /*
2 : * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 : *
4 : * Use of this source code is governed by a BSD-style license
5 : * that can be found in the LICENSE file in the root of the source
6 : * tree. An additional intellectual property rights grant can be found
7 : * in the file PATENTS. All contributing project authors may
8 : * be found in the AUTHORS file in the root of the source tree.
9 : */
10 :
11 :
12 : #include "extend.h"
13 : #include "vpx_mem/vpx_mem.h"
14 :
15 :
16 0 : static void copy_and_extend_plane
17 : (
18 : unsigned char *s, /* source */
19 : int sp, /* source pitch */
20 : unsigned char *d, /* destination */
21 : int dp, /* destination pitch */
22 : int h, /* height */
23 : int w, /* width */
24 : int et, /* extend top border */
25 : int el, /* extend left border */
26 : int eb, /* extend bottom border */
27 : int er /* extend right border */
28 : )
29 : {
30 : int i;
31 : unsigned char *src_ptr1, *src_ptr2;
32 : unsigned char *dest_ptr1, *dest_ptr2;
33 : int linesize;
34 :
35 : /* copy the left and right most columns out */
36 0 : src_ptr1 = s;
37 0 : src_ptr2 = s + w - 1;
38 0 : dest_ptr1 = d - el;
39 0 : dest_ptr2 = d + w;
40 :
41 0 : for (i = 0; i < h; i++)
42 : {
43 0 : vpx_memset(dest_ptr1, src_ptr1[0], el);
44 0 : vpx_memcpy(dest_ptr1 + el, src_ptr1, w);
45 0 : vpx_memset(dest_ptr2, src_ptr2[0], er);
46 0 : src_ptr1 += sp;
47 0 : src_ptr2 += sp;
48 0 : dest_ptr1 += dp;
49 0 : dest_ptr2 += dp;
50 : }
51 :
52 : /* Now copy the top and bottom lines into each line of the respective
53 : * borders
54 : */
55 0 : src_ptr1 = d - el;
56 0 : src_ptr2 = d + dp * (h - 1) - el;
57 0 : dest_ptr1 = d + dp * (-et) - el;
58 0 : dest_ptr2 = d + dp * (h) - el;
59 0 : linesize = el + er + w;
60 :
61 0 : for (i = 0; i < et; i++)
62 : {
63 0 : vpx_memcpy(dest_ptr1, src_ptr1, linesize);
64 0 : dest_ptr1 += dp;
65 : }
66 :
67 0 : for (i = 0; i < eb; i++)
68 : {
69 0 : vpx_memcpy(dest_ptr2, src_ptr2, linesize);
70 0 : dest_ptr2 += dp;
71 : }
72 0 : }
73 :
74 :
75 0 : void vp8_copy_and_extend_frame(YV12_BUFFER_CONFIG *src,
76 : YV12_BUFFER_CONFIG *dst)
77 : {
78 0 : int et = dst->border;
79 0 : int el = dst->border;
80 0 : int eb = dst->border + dst->y_height - src->y_height;
81 0 : int er = dst->border + dst->y_width - src->y_width;
82 :
83 0 : copy_and_extend_plane(src->y_buffer, src->y_stride,
84 : dst->y_buffer, dst->y_stride,
85 : src->y_height, src->y_width,
86 : et, el, eb, er);
87 :
88 0 : et = dst->border >> 1;
89 0 : el = dst->border >> 1;
90 0 : eb = (dst->border >> 1) + dst->uv_height - src->uv_height;
91 0 : er = (dst->border >> 1) + dst->uv_width - src->uv_width;
92 :
93 0 : copy_and_extend_plane(src->u_buffer, src->uv_stride,
94 : dst->u_buffer, dst->uv_stride,
95 : src->uv_height, src->uv_width,
96 : et, el, eb, er);
97 :
98 0 : copy_and_extend_plane(src->v_buffer, src->uv_stride,
99 : dst->v_buffer, dst->uv_stride,
100 : src->uv_height, src->uv_width,
101 : et, el, eb, er);
102 0 : }
103 :
104 :
105 : /* note the extension is only for the last row, for intra prediction purpose */
106 0 : void vp8_extend_mb_row(YV12_BUFFER_CONFIG *ybf, unsigned char *YPtr, unsigned char *UPtr, unsigned char *VPtr)
107 : {
108 : int i;
109 :
110 0 : YPtr += ybf->y_stride * 14;
111 0 : UPtr += ybf->uv_stride * 6;
112 0 : VPtr += ybf->uv_stride * 6;
113 :
114 0 : for (i = 0; i < 4; i++)
115 : {
116 0 : YPtr[i] = YPtr[-1];
117 0 : UPtr[i] = UPtr[-1];
118 0 : VPtr[i] = VPtr[-1];
119 : }
120 :
121 0 : YPtr += ybf->y_stride;
122 0 : UPtr += ybf->uv_stride;
123 0 : VPtr += ybf->uv_stride;
124 :
125 0 : for (i = 0; i < 4; i++)
126 : {
127 0 : YPtr[i] = YPtr[-1];
128 0 : UPtr[i] = UPtr[-1];
129 0 : VPtr[i] = VPtr[-1];
130 : }
131 0 : }
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