Line data Source code
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 : #include "extend.h"
12 : #include "vpx_mem/vpx_mem.h"
13 :
14 0 : static void copy_and_extend_plane(unsigned char *s, /* source */
15 : int sp, /* source pitch */
16 : unsigned char *d, /* destination */
17 : int dp, /* destination pitch */
18 : int h, /* height */
19 : int w, /* width */
20 : int et, /* extend top border */
21 : int el, /* extend left border */
22 : int eb, /* extend bottom border */
23 : int er /* extend right border */
24 : ) {
25 : int i;
26 : unsigned char *src_ptr1, *src_ptr2;
27 : unsigned char *dest_ptr1, *dest_ptr2;
28 : int linesize;
29 :
30 : /* copy the left and right most columns out */
31 0 : src_ptr1 = s;
32 0 : src_ptr2 = s + w - 1;
33 0 : dest_ptr1 = d - el;
34 0 : dest_ptr2 = d + w;
35 :
36 0 : for (i = 0; i < h; ++i) {
37 0 : memset(dest_ptr1, src_ptr1[0], el);
38 0 : memcpy(dest_ptr1 + el, src_ptr1, w);
39 0 : memset(dest_ptr2, src_ptr2[0], er);
40 0 : src_ptr1 += sp;
41 0 : src_ptr2 += sp;
42 0 : dest_ptr1 += dp;
43 0 : dest_ptr2 += dp;
44 : }
45 :
46 : /* Now copy the top and bottom lines into each line of the respective
47 : * borders
48 : */
49 0 : src_ptr1 = d - el;
50 0 : src_ptr2 = d + dp * (h - 1) - el;
51 0 : dest_ptr1 = d + dp * (-et) - el;
52 0 : dest_ptr2 = d + dp * (h)-el;
53 0 : linesize = el + er + w;
54 :
55 0 : for (i = 0; i < et; ++i) {
56 0 : memcpy(dest_ptr1, src_ptr1, linesize);
57 0 : dest_ptr1 += dp;
58 : }
59 :
60 0 : for (i = 0; i < eb; ++i) {
61 0 : memcpy(dest_ptr2, src_ptr2, linesize);
62 0 : dest_ptr2 += dp;
63 : }
64 0 : }
65 :
66 0 : void vp8_copy_and_extend_frame(YV12_BUFFER_CONFIG *src,
67 : YV12_BUFFER_CONFIG *dst) {
68 0 : int et = dst->border;
69 0 : int el = dst->border;
70 0 : int eb = dst->border + dst->y_height - src->y_height;
71 0 : int er = dst->border + dst->y_width - src->y_width;
72 :
73 0 : copy_and_extend_plane(src->y_buffer, src->y_stride, dst->y_buffer,
74 : dst->y_stride, src->y_height, src->y_width, et, el, eb,
75 : er);
76 :
77 0 : et = dst->border >> 1;
78 0 : el = dst->border >> 1;
79 0 : eb = (dst->border >> 1) + dst->uv_height - src->uv_height;
80 0 : er = (dst->border >> 1) + dst->uv_width - src->uv_width;
81 :
82 0 : copy_and_extend_plane(src->u_buffer, src->uv_stride, dst->u_buffer,
83 : dst->uv_stride, src->uv_height, src->uv_width, et, el,
84 : eb, er);
85 :
86 0 : copy_and_extend_plane(src->v_buffer, src->uv_stride, dst->v_buffer,
87 : dst->uv_stride, src->uv_height, src->uv_width, et, el,
88 : eb, er);
89 0 : }
90 :
91 0 : void vp8_copy_and_extend_frame_with_rect(YV12_BUFFER_CONFIG *src,
92 : YV12_BUFFER_CONFIG *dst, int srcy,
93 : int srcx, int srch, int srcw) {
94 0 : int et = dst->border;
95 0 : int el = dst->border;
96 0 : int eb = dst->border + dst->y_height - src->y_height;
97 0 : int er = dst->border + dst->y_width - src->y_width;
98 0 : int src_y_offset = srcy * src->y_stride + srcx;
99 0 : int dst_y_offset = srcy * dst->y_stride + srcx;
100 0 : int src_uv_offset = ((srcy * src->uv_stride) >> 1) + (srcx >> 1);
101 0 : int dst_uv_offset = ((srcy * dst->uv_stride) >> 1) + (srcx >> 1);
102 :
103 : /* If the side is not touching the bounder then don't extend. */
104 0 : if (srcy) et = 0;
105 0 : if (srcx) el = 0;
106 0 : if (srcy + srch != src->y_height) eb = 0;
107 0 : if (srcx + srcw != src->y_width) er = 0;
108 :
109 0 : copy_and_extend_plane(src->y_buffer + src_y_offset, src->y_stride,
110 0 : dst->y_buffer + dst_y_offset, dst->y_stride, srch, srcw,
111 : et, el, eb, er);
112 :
113 0 : et = (et + 1) >> 1;
114 0 : el = (el + 1) >> 1;
115 0 : eb = (eb + 1) >> 1;
116 0 : er = (er + 1) >> 1;
117 0 : srch = (srch + 1) >> 1;
118 0 : srcw = (srcw + 1) >> 1;
119 :
120 0 : copy_and_extend_plane(src->u_buffer + src_uv_offset, src->uv_stride,
121 0 : dst->u_buffer + dst_uv_offset, dst->uv_stride, srch,
122 : srcw, et, el, eb, er);
123 :
124 0 : copy_and_extend_plane(src->v_buffer + src_uv_offset, src->uv_stride,
125 0 : dst->v_buffer + dst_uv_offset, dst->uv_stride, srch,
126 : srcw, et, el, eb, er);
127 0 : }
128 :
129 : /* note the extension is only for the last row, for intra prediction purpose */
130 0 : void vp8_extend_mb_row(YV12_BUFFER_CONFIG *ybf, unsigned char *YPtr,
131 : unsigned char *UPtr, unsigned char *VPtr) {
132 : int i;
133 :
134 0 : YPtr += ybf->y_stride * 14;
135 0 : UPtr += ybf->uv_stride * 6;
136 0 : VPtr += ybf->uv_stride * 6;
137 :
138 0 : for (i = 0; i < 4; ++i) {
139 0 : YPtr[i] = YPtr[-1];
140 0 : UPtr[i] = UPtr[-1];
141 0 : VPtr[i] = VPtr[-1];
142 : }
143 :
144 0 : YPtr += ybf->y_stride;
145 0 : UPtr += ybf->uv_stride;
146 0 : VPtr += ybf->uv_stride;
147 :
148 0 : for (i = 0; i < 4; ++i) {
149 0 : YPtr[i] = YPtr[-1];
150 0 : UPtr[i] = UPtr[-1];
151 0 : VPtr[i] = VPtr[-1];
152 : }
153 0 : }
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