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 
copy_and_extend_plane(const uint8_t * src,int src_pitch,uint8_t * dst,int dst_pitch,int w,int h,int extend_top,int extend_left,int extend_bottom,int extend_right)16 static 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 
vp9_copy_and_extend_frame(const YV12_BUFFER_CONFIG * src,YV12_BUFFER_CONFIG * dst)58 void 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 #if CONFIG_ALPHA
79   const int et_a = dst->border >> (dst->alpha_height != dst->y_height);
80   const int el_a = dst->border >> (dst->alpha_width != dst->y_width);
81   const int eb_a = et_a + dst->alpha_height - src->alpha_height;
82   const int er_a = el_a + dst->alpha_width - src->alpha_width;
83 
84   copy_and_extend_plane(src->alpha_buffer, src->alpha_stride,
85                         dst->alpha_buffer, dst->alpha_stride,
86                         src->alpha_width, src->alpha_height,
87                         et_a, el_a, eb_a, er_a);
88 #endif
89 
90   copy_and_extend_plane(src->y_buffer, src->y_stride,
91                         dst->y_buffer, dst->y_stride,
92                         src->y_width, src->y_height,
93                         et_y, el_y, eb_y, er_y);
94 
95   copy_and_extend_plane(src->u_buffer, src->uv_stride,
96                         dst->u_buffer, dst->uv_stride,
97                         src->uv_width, src->uv_height,
98                         et_uv, el_uv, eb_uv, er_uv);
99 
100   copy_and_extend_plane(src->v_buffer, src->uv_stride,
101                         dst->v_buffer, dst->uv_stride,
102                         src->uv_width, src->uv_height,
103                         et_uv, el_uv, eb_uv, er_uv);
104 }
105 
vp9_copy_and_extend_frame_with_rect(const YV12_BUFFER_CONFIG * src,YV12_BUFFER_CONFIG * dst,int srcy,int srcx,int srch,int srcw)106 void vp9_copy_and_extend_frame_with_rect(const YV12_BUFFER_CONFIG *src,
107                                          YV12_BUFFER_CONFIG *dst,
108                                          int srcy, int srcx,
109                                          int srch, int srcw) {
110   // If the side is not touching the bounder then don't extend.
111   const int et_y = srcy ? 0 : dst->border;
112   const int el_y = srcx ? 0 : dst->border;
113   const int eb_y = srcy + srch != src->y_height ? 0 :
114                       dst->border + dst->y_height - src->y_height;
115   const int er_y = srcx + srcw != src->y_width ? 0 :
116                       dst->border + dst->y_width - src->y_width;
117   const int src_y_offset = srcy * src->y_stride + srcx;
118   const int dst_y_offset = srcy * dst->y_stride + srcx;
119 
120   const int et_uv = ROUND_POWER_OF_TWO(et_y, 1);
121   const int el_uv = ROUND_POWER_OF_TWO(el_y, 1);
122   const int eb_uv = ROUND_POWER_OF_TWO(eb_y, 1);
123   const int er_uv = ROUND_POWER_OF_TWO(er_y, 1);
124   const int src_uv_offset = ((srcy * src->uv_stride) >> 1) + (srcx >> 1);
125   const int dst_uv_offset = ((srcy * dst->uv_stride) >> 1) + (srcx >> 1);
126   const int srch_uv = ROUND_POWER_OF_TWO(srch, 1);
127   const int srcw_uv = ROUND_POWER_OF_TWO(srcw, 1);
128 
129   copy_and_extend_plane(src->y_buffer + src_y_offset, src->y_stride,
130                         dst->y_buffer + dst_y_offset, dst->y_stride,
131                         srcw, srch,
132                         et_y, el_y, eb_y, er_y);
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,
136                         srcw_uv, srch_uv,
137                         et_uv, el_uv, eb_uv, er_uv);
138 
139   copy_and_extend_plane(src->v_buffer + src_uv_offset, src->uv_stride,
140                         dst->v_buffer + dst_uv_offset, dst->uv_stride,
141                         srcw_uv, srch_uv,
142                         et_uv, el_uv, eb_uv, er_uv);
143 }
144