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,int interleave_step)14 static void copy_and_extend_plane(
15 unsigned char *s, /* source */
16 int sp, /* source pitch */
17 unsigned char *d, /* destination */
18 int dp, /* destination pitch */
19 int h, /* height */
20 int w, /* width */
21 int et, /* extend top border */
22 int el, /* extend left border */
23 int eb, /* extend bottom border */
24 int er, /* extend right border */
25 int interleave_step) { /* step between pixels of the current plane */
26 int i, j;
27 unsigned char *src_ptr1, *src_ptr2;
28 unsigned char *dest_ptr1, *dest_ptr2;
29 int linesize;
30
31 if (interleave_step < 1) interleave_step = 1;
32
33 /* copy the left and right most columns out */
34 src_ptr1 = s;
35 src_ptr2 = s + (w - 1) * interleave_step;
36 dest_ptr1 = d - el;
37 dest_ptr2 = d + w;
38
39 for (i = 0; i < h; ++i) {
40 memset(dest_ptr1, src_ptr1[0], el);
41 if (interleave_step == 1) {
42 memcpy(dest_ptr1 + el, src_ptr1, w);
43 } else {
44 for (j = 0; j < w; j++) {
45 dest_ptr1[el + j] = src_ptr1[interleave_step * j];
46 }
47 }
48 memset(dest_ptr2, src_ptr2[0], er);
49 src_ptr1 += sp;
50 src_ptr2 += sp;
51 dest_ptr1 += dp;
52 dest_ptr2 += dp;
53 }
54
55 /* Now copy the top and bottom lines into each line of the respective
56 * borders
57 */
58 src_ptr1 = d - el;
59 src_ptr2 = d + dp * (h - 1) - el;
60 dest_ptr1 = d + dp * (-et) - el;
61 dest_ptr2 = d + dp * (h)-el;
62 linesize = el + er + w;
63
64 for (i = 0; i < et; ++i) {
65 memcpy(dest_ptr1, src_ptr1, linesize);
66 dest_ptr1 += dp;
67 }
68
69 for (i = 0; i < eb; ++i) {
70 memcpy(dest_ptr2, src_ptr2, linesize);
71 dest_ptr2 += dp;
72 }
73 }
74
vp8_copy_and_extend_frame(YV12_BUFFER_CONFIG * src,YV12_BUFFER_CONFIG * dst)75 void vp8_copy_and_extend_frame(YV12_BUFFER_CONFIG *src,
76 YV12_BUFFER_CONFIG *dst) {
77 int et = dst->border;
78 int el = dst->border;
79 int eb = dst->border + dst->y_height - src->y_height;
80 int er = dst->border + dst->y_width - src->y_width;
81
82 // detect nv12 colorspace
83 int chroma_step = src->v_buffer - src->u_buffer == 1 ? 2 : 1;
84
85 copy_and_extend_plane(src->y_buffer, src->y_stride, dst->y_buffer,
86 dst->y_stride, src->y_height, src->y_width, et, el, eb,
87 er, 1);
88
89 et = dst->border >> 1;
90 el = dst->border >> 1;
91 eb = (dst->border >> 1) + dst->uv_height - src->uv_height;
92 er = (dst->border >> 1) + dst->uv_width - src->uv_width;
93
94 copy_and_extend_plane(src->u_buffer, src->uv_stride, dst->u_buffer,
95 dst->uv_stride, src->uv_height, src->uv_width, et, el,
96 eb, er, chroma_step);
97
98 copy_and_extend_plane(src->v_buffer, src->uv_stride, dst->v_buffer,
99 dst->uv_stride, src->uv_height, src->uv_width, et, el,
100 eb, er, chroma_step);
101 }
102
vp8_copy_and_extend_frame_with_rect(YV12_BUFFER_CONFIG * src,YV12_BUFFER_CONFIG * dst,int srcy,int srcx,int srch,int srcw)103 void vp8_copy_and_extend_frame_with_rect(YV12_BUFFER_CONFIG *src,
104 YV12_BUFFER_CONFIG *dst, int srcy,
105 int srcx, int srch, int srcw) {
106 int et = dst->border;
107 int el = dst->border;
108 int eb = dst->border + dst->y_height - src->y_height;
109 int er = dst->border + dst->y_width - src->y_width;
110 int src_y_offset = srcy * src->y_stride + srcx;
111 int dst_y_offset = srcy * dst->y_stride + srcx;
112 int src_uv_offset = ((srcy * src->uv_stride) >> 1) + (srcx >> 1);
113 int dst_uv_offset = ((srcy * dst->uv_stride) >> 1) + (srcx >> 1);
114 // detect nv12 colorspace
115 int chroma_step = src->v_buffer - src->u_buffer == 1 ? 2 : 1;
116
117 /* If the side is not touching the bounder then don't extend. */
118 if (srcy) et = 0;
119 if (srcx) el = 0;
120 if (srcy + srch != src->y_height) eb = 0;
121 if (srcx + srcw != src->y_width) er = 0;
122
123 copy_and_extend_plane(src->y_buffer + src_y_offset, src->y_stride,
124 dst->y_buffer + dst_y_offset, dst->y_stride, srch, srcw,
125 et, el, eb, er, 1);
126
127 et = (et + 1) >> 1;
128 el = (el + 1) >> 1;
129 eb = (eb + 1) >> 1;
130 er = (er + 1) >> 1;
131 srch = (srch + 1) >> 1;
132 srcw = (srcw + 1) >> 1;
133
134 copy_and_extend_plane(src->u_buffer + src_uv_offset, src->uv_stride,
135 dst->u_buffer + dst_uv_offset, dst->uv_stride, srch,
136 srcw, et, el, eb, er, chroma_step);
137
138 copy_and_extend_plane(src->v_buffer + src_uv_offset, src->uv_stride,
139 dst->v_buffer + dst_uv_offset, dst->uv_stride, srch,
140 srcw, et, el, eb, er, chroma_step);
141 }
142
143 /* 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)144 void vp8_extend_mb_row(YV12_BUFFER_CONFIG *ybf, unsigned char *YPtr,
145 unsigned char *UPtr, unsigned char *VPtr) {
146 int i;
147
148 YPtr += ybf->y_stride * 14;
149 UPtr += ybf->uv_stride * 6;
150 VPtr += ybf->uv_stride * 6;
151
152 for (i = 0; i < 4; ++i) {
153 YPtr[i] = YPtr[-1];
154 UPtr[i] = UPtr[-1];
155 VPtr[i] = VPtr[-1];
156 }
157
158 YPtr += ybf->y_stride;
159 UPtr += ybf->uv_stride;
160 VPtr += ybf->uv_stride;
161
162 for (i = 0; i < 4; ++i) {
163 YPtr[i] = YPtr[-1];
164 UPtr[i] = UPtr[-1];
165 VPtr[i] = VPtr[-1];
166 }
167 }
168