1 /*
2  * Copyright (C) 2011 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include "rsMatrix2x2.h"
18 #include "rsMatrix3x3.h"
19 #include "rsMatrix4x4.h"
20 
21 #include "stdlib.h"
22 #include "string.h"
23 #include "math.h"
24 
25 namespace android {
26 namespace renderscript {
27 
loadIdentity()28 void Matrix3x3::loadIdentity() {
29     m[0] = 1.f;
30     m[1] = 0.f;
31     m[2] = 0.f;
32     m[3] = 0.f;
33     m[4] = 1.f;
34     m[5] = 0.f;
35     m[6] = 0.f;
36     m[7] = 0.f;
37     m[8] = 1.f;
38 }
39 
load(const float * v)40 void Matrix3x3::load(const float *v) {
41     memcpy(m, v, sizeof(m));
42 }
43 
load(const rs_matrix3x3 * v)44 void Matrix3x3::load(const rs_matrix3x3 *v) {
45     memcpy(m, v->m, sizeof(m));
46 }
47 
loadMultiply(const rs_matrix3x3 * lhs,const rs_matrix3x3 * rhs)48 void Matrix3x3::loadMultiply(const rs_matrix3x3 *lhs, const rs_matrix3x3 *rhs) {
49     // Use a temporary variable to support the case where one of the inputs
50     // is also the destination, e.g. left.loadMultiply(left, right);
51     Matrix3x3 temp;
52     for (int i=0 ; i<3 ; i++) {
53         float ri0 = 0;
54         float ri1 = 0;
55         float ri2 = 0;
56         for (int j=0 ; j<3 ; j++) {
57             const float rhs_ij = ((const Matrix3x3 *)rhs)->get(i, j);
58             ri0 += ((const Matrix3x3 *)lhs)->get(j, 0) * rhs_ij;
59             ri1 += ((const Matrix3x3 *)lhs)->get(j, 1) * rhs_ij;
60             ri2 += ((const Matrix3x3 *)lhs)->get(j, 2) * rhs_ij;
61         }
62         temp.set(i, 0, ri0);
63         temp.set(i, 1, ri1);
64         temp.set(i, 2, ri2);
65     }
66     load(&temp);
67 }
68 
transpose()69 void Matrix3x3::transpose() {
70     int i, j;
71     float temp;
72     for (i = 0; i < 2; ++i) {
73         for (j = i + 1; j < 3; ++j) {
74             temp = get(i, j);
75             set(i, j, get(j, i));
76             set(j, i, temp);
77         }
78     }
79 }
80 
81 } // namespace renderscript
82 } // namespace android
83