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 "vpx_mem/vpx_mem.h"
12
13#include "vp9/common/vp9_common.h"
14#include "vp9/encoder/vp9_extend.h"
15
16static void copy_and_extend_plane(const uint8_t *src, int src_pitch,
17                                  uint8_t *dst, int dst_pitch,
18                                  int w, int h,
19                                  int extend_top, int extend_left,
20                                  int extend_bottom, int extend_right) {
21  int i, linesize;
22
23  // copy the left and right most columns out
24  const uint8_t *src_ptr1 = src;
25  const uint8_t *src_ptr2 = src + w - 1;
26  uint8_t *dst_ptr1 = dst - extend_left;
27  uint8_t *dst_ptr2 = dst + w;
28
29  for (i = 0; i < h; i++) {
30    vpx_memset(dst_ptr1, src_ptr1[0], extend_left);
31    vpx_memcpy(dst_ptr1 + extend_left, src_ptr1, w);
32    vpx_memset(dst_ptr2, src_ptr2[0], extend_right);
33    src_ptr1 += src_pitch;
34    src_ptr2 += src_pitch;
35    dst_ptr1 += dst_pitch;
36    dst_ptr2 += dst_pitch;
37  }
38
39  // Now copy the top and bottom lines into each line of the respective
40  // borders
41  src_ptr1 = dst - extend_left;
42  src_ptr2 = dst + dst_pitch * (h - 1) - extend_left;
43  dst_ptr1 = dst + dst_pitch * (-extend_top) - extend_left;
44  dst_ptr2 = dst + dst_pitch * (h) - extend_left;
45  linesize = extend_left + extend_right + w;
46
47  for (i = 0; i < extend_top; i++) {
48    vpx_memcpy(dst_ptr1, src_ptr1, linesize);
49    dst_ptr1 += dst_pitch;
50  }
51
52  for (i = 0; i < extend_bottom; i++) {
53    vpx_memcpy(dst_ptr2, src_ptr2, linesize);
54    dst_ptr2 += dst_pitch;
55  }
56}
57
58void vp9_copy_and_extend_frame(const YV12_BUFFER_CONFIG *src,
59                               YV12_BUFFER_CONFIG *dst) {
60  // Extend src frame in buffer
61  // Altref filtering assumes 16 pixel extension
62  const int et_y = 16;
63  const int el_y = 16;
64  // Motion estimation may use src block variance with the block size up
65  // to 64x64, so the right and bottom need to be extended to 64 multiple
66  // or up to 16, whichever is greater.
67  const int eb_y = MAX(ALIGN_POWER_OF_TWO(src->y_width, 6) - src->y_width,
68                       16);
69  const int er_y = MAX(ALIGN_POWER_OF_TWO(src->y_height, 6) - src->y_height,
70                       16);
71  const int uv_width_subsampling = (src->uv_width != src->y_width);
72  const int uv_height_subsampling = (src->uv_height != src->y_height);
73  const int et_uv = et_y >> uv_height_subsampling;
74  const int el_uv = el_y >> uv_width_subsampling;
75  const int eb_uv = eb_y >> uv_height_subsampling;
76  const int er_uv = er_y >> uv_width_subsampling;
77
78  copy_and_extend_plane(src->y_buffer, src->y_stride,
79                        dst->y_buffer, dst->y_stride,
80                        src->y_width, src->y_height,
81                        et_y, el_y, eb_y, er_y);
82
83  copy_and_extend_plane(src->u_buffer, src->uv_stride,
84                        dst->u_buffer, dst->uv_stride,
85                        src->uv_width, src->uv_height,
86                        et_uv, el_uv, eb_uv, er_uv);
87
88  copy_and_extend_plane(src->v_buffer, src->uv_stride,
89                        dst->v_buffer, dst->uv_stride,
90                        src->uv_width, src->uv_height,
91                        et_uv, el_uv, eb_uv, er_uv);
92}
93
94void vp9_copy_and_extend_frame_with_rect(const YV12_BUFFER_CONFIG *src,
95                                         YV12_BUFFER_CONFIG *dst,
96                                         int srcy, int srcx,
97                                         int srch, int srcw) {
98  // If the side is not touching the bounder then don't extend.
99  const int et_y = srcy ? 0 : dst->border;
100  const int el_y = srcx ? 0 : dst->border;
101  const int eb_y = srcy + srch != src->y_height ? 0 :
102                      dst->border + dst->y_height - src->y_height;
103  const int er_y = srcx + srcw != src->y_width ? 0 :
104                      dst->border + dst->y_width - src->y_width;
105  const int src_y_offset = srcy * src->y_stride + srcx;
106  const int dst_y_offset = srcy * dst->y_stride + srcx;
107
108  const int et_uv = ROUND_POWER_OF_TWO(et_y, 1);
109  const int el_uv = ROUND_POWER_OF_TWO(el_y, 1);
110  const int eb_uv = ROUND_POWER_OF_TWO(eb_y, 1);
111  const int er_uv = ROUND_POWER_OF_TWO(er_y, 1);
112  const int src_uv_offset = ((srcy * src->uv_stride) >> 1) + (srcx >> 1);
113  const int dst_uv_offset = ((srcy * dst->uv_stride) >> 1) + (srcx >> 1);
114  const int srch_uv = ROUND_POWER_OF_TWO(srch, 1);
115  const int srcw_uv = ROUND_POWER_OF_TWO(srcw, 1);
116
117  copy_and_extend_plane(src->y_buffer + src_y_offset, src->y_stride,
118                        dst->y_buffer + dst_y_offset, dst->y_stride,
119                        srcw, srch,
120                        et_y, el_y, eb_y, er_y);
121
122  copy_and_extend_plane(src->u_buffer + src_uv_offset, src->uv_stride,
123                        dst->u_buffer + dst_uv_offset, dst->uv_stride,
124                        srcw_uv, srch_uv,
125                        et_uv, el_uv, eb_uv, er_uv);
126
127  copy_and_extend_plane(src->v_buffer + src_uv_offset, src->uv_stride,
128                        dst->v_buffer + dst_uv_offset, dst->uv_stride,
129                        srcw_uv, srch_uv,
130                        et_uv, el_uv, eb_uv, er_uv);
131}
132