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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 "blockd.h"
13 
14 typedef enum
15 {
16     PRED = 0,
17     DEST = 1
18 } BLOCKSET;
19 
setup_block(BLOCKD * b,int mv_stride,unsigned char ** base,int Stride,int offset,BLOCKSET bs)20 static void setup_block
21 (
22     BLOCKD *b,
23     int mv_stride,
24     unsigned char **base,
25     int Stride,
26     int offset,
27     BLOCKSET bs
28 )
29 {
30 
31     if (bs == DEST)
32     {
33         b->dst_stride = Stride;
34         b->dst = offset;
35         b->base_dst = base;
36     }
37     else
38     {
39         b->pre_stride = Stride;
40         b->pre = offset;
41         b->base_pre = base;
42     }
43 
44 }
45 
46 
setup_macroblock(MACROBLOCKD * x,BLOCKSET bs)47 static void setup_macroblock(MACROBLOCKD *x, BLOCKSET bs)
48 {
49     int block;
50 
51     unsigned char **y, **u, **v;
52 
53     if (bs == DEST)
54     {
55         y = &x->dst.y_buffer;
56         u = &x->dst.u_buffer;
57         v = &x->dst.v_buffer;
58     }
59     else
60     {
61         y = &x->pre.y_buffer;
62         u = &x->pre.u_buffer;
63         v = &x->pre.v_buffer;
64     }
65 
66     for (block = 0; block < 16; block++) /* y blocks */
67     {
68         setup_block(&x->block[block], x->dst.y_stride, y, x->dst.y_stride,
69                         (block >> 2) * 4 * x->dst.y_stride + (block & 3) * 4, bs);
70     }
71 
72     for (block = 16; block < 20; block++) /* U and V blocks */
73     {
74         setup_block(&x->block[block], x->dst.uv_stride, u, x->dst.uv_stride,
75                         ((block - 16) >> 1) * 4 * x->dst.uv_stride + (block & 1) * 4, bs);
76 
77         setup_block(&x->block[block+4], x->dst.uv_stride, v, x->dst.uv_stride,
78                         ((block - 16) >> 1) * 4 * x->dst.uv_stride + (block & 1) * 4, bs);
79     }
80 }
81 
vp8_setup_block_dptrs(MACROBLOCKD * x)82 void vp8_setup_block_dptrs(MACROBLOCKD *x)
83 {
84     int r, c;
85 
86     for (r = 0; r < 4; r++)
87     {
88         for (c = 0; c < 4; c++)
89         {
90             x->block[r*4+c].diff      = &x->diff[r * 4 * 16 + c * 4];
91             x->block[r*4+c].predictor = x->predictor + r * 4 * 16 + c * 4;
92         }
93     }
94 
95     for (r = 0; r < 2; r++)
96     {
97         for (c = 0; c < 2; c++)
98         {
99             x->block[16+r*2+c].diff      = &x->diff[256 + r * 4 * 8 + c * 4];
100             x->block[16+r*2+c].predictor = x->predictor + 256 + r * 4 * 8 + c * 4;
101 
102         }
103     }
104 
105     for (r = 0; r < 2; r++)
106     {
107         for (c = 0; c < 2; c++)
108         {
109             x->block[20+r*2+c].diff      = &x->diff[320+ r * 4 * 8 + c * 4];
110             x->block[20+r*2+c].predictor = x->predictor + 320 + r * 4 * 8 + c * 4;
111 
112         }
113     }
114 
115     x->block[24].diff = &x->diff[384];
116 
117     for (r = 0; r < 25; r++)
118     {
119         x->block[r].qcoeff  = x->qcoeff  + r * 16;
120         x->block[r].dqcoeff = x->dqcoeff + r * 16;
121     }
122 }
123 
vp8_build_block_doffsets(MACROBLOCKD * x)124 void vp8_build_block_doffsets(MACROBLOCKD *x)
125 {
126 
127     /* handle the destination pitch features */
128     setup_macroblock(x, DEST);
129     setup_macroblock(x, PRED);
130 }
131