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
16static 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    src_ptr1 = s;
37    src_ptr2 = s + w - 1;
38    dest_ptr1 = d - el;
39    dest_ptr2 = d + w;
40
41    for (i = 0; i < h; i++)
42    {
43        vpx_memset(dest_ptr1, src_ptr1[0], el);
44        vpx_memcpy(dest_ptr1 + el, src_ptr1, w);
45        vpx_memset(dest_ptr2, src_ptr2[0], er);
46        src_ptr1  += sp;
47        src_ptr2  += sp;
48        dest_ptr1 += dp;
49        dest_ptr2 += dp;
50    }
51
52    /* Now copy the top and bottom lines into each line of the respective
53     * borders
54     */
55    src_ptr1 = d - el;
56    src_ptr2 = d + dp * (h - 1) - el;
57    dest_ptr1 = d + dp * (-et) - el;
58    dest_ptr2 = d + dp * (h) - el;
59    linesize = el + er + w;
60
61    for (i = 0; i < et; i++)
62    {
63        vpx_memcpy(dest_ptr1, src_ptr1, linesize);
64        dest_ptr1 += dp;
65    }
66
67    for (i = 0; i < eb; i++)
68    {
69        vpx_memcpy(dest_ptr2, src_ptr2, linesize);
70        dest_ptr2 += dp;
71    }
72}
73
74
75void vp8_copy_and_extend_frame(YV12_BUFFER_CONFIG *src,
76                               YV12_BUFFER_CONFIG *dst)
77{
78    int et = dst->border;
79    int el = dst->border;
80    int eb = dst->border + dst->y_height - src->y_height;
81    int er = dst->border + dst->y_width - src->y_width;
82
83    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    et = dst->border >> 1;
89    el = dst->border >> 1;
90    eb = (dst->border >> 1) + dst->uv_height - src->uv_height;
91    er = (dst->border >> 1) + dst->uv_width - src->uv_width;
92
93    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    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}
103
104
105void vp8_copy_and_extend_frame_with_rect(YV12_BUFFER_CONFIG *src,
106                                         YV12_BUFFER_CONFIG *dst,
107                                         int srcy, int srcx,
108                                         int srch, int srcw)
109{
110    int et = dst->border;
111    int el = dst->border;
112    int eb = dst->border + dst->y_height - src->y_height;
113    int er = dst->border + dst->y_width - src->y_width;
114    int src_y_offset = srcy * src->y_stride + srcx;
115    int dst_y_offset = srcy * dst->y_stride + srcx;
116    int src_uv_offset = ((srcy * src->uv_stride) >> 1) + (srcx >> 1);
117    int dst_uv_offset = ((srcy * dst->uv_stride) >> 1) + (srcx >> 1);
118
119    /* If the side is not touching the bounder then don't extend. */
120    if (srcy)
121      et = 0;
122    if (srcx)
123      el = 0;
124    if (srcy + srch != src->y_height)
125      eb = 0;
126    if (srcx + srcw != src->y_width)
127      er = 0;
128
129    copy_and_extend_plane(src->y_buffer + src_y_offset,
130                          src->y_stride,
131                          dst->y_buffer + dst_y_offset,
132                          dst->y_stride,
133                          srch, srcw,
134                          et, el, eb, er);
135
136    et = (et + 1) >> 1;
137    el = (el + 1) >> 1;
138    eb = (eb + 1) >> 1;
139    er = (er + 1) >> 1;
140    srch = (srch + 1) >> 1;
141    srcw = (srcw + 1) >> 1;
142
143    copy_and_extend_plane(src->u_buffer + src_uv_offset,
144                          src->uv_stride,
145                          dst->u_buffer + dst_uv_offset,
146                          dst->uv_stride,
147                          srch, srcw,
148                          et, el, eb, er);
149
150    copy_and_extend_plane(src->v_buffer + src_uv_offset,
151                          src->uv_stride,
152                          dst->v_buffer + dst_uv_offset,
153                          dst->uv_stride,
154                          srch, srcw,
155                          et, el, eb, er);
156}
157
158
159/* note the extension is only for the last row, for intra prediction purpose */
160void vp8_extend_mb_row(YV12_BUFFER_CONFIG *ybf,
161                       unsigned char *YPtr,
162                       unsigned char *UPtr,
163                       unsigned char *VPtr)
164{
165    int i;
166
167    YPtr += ybf->y_stride * 14;
168    UPtr += ybf->uv_stride * 6;
169    VPtr += ybf->uv_stride * 6;
170
171    for (i = 0; i < 4; i++)
172    {
173        YPtr[i] = YPtr[-1];
174        UPtr[i] = UPtr[-1];
175        VPtr[i] = VPtr[-1];
176    }
177
178    YPtr += ybf->y_stride;
179    UPtr += ybf->uv_stride;
180    VPtr += ybf->uv_stride;
181
182    for (i = 0; i < 4; i++)
183    {
184        YPtr[i] = YPtr[-1];
185        UPtr[i] = UPtr[-1];
186        VPtr[i] = VPtr[-1];
187    }
188}
189