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