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      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 using namespace android;
     26 using namespace android::renderscript;
     27 
     28 
     29 void Matrix2x2::loadIdentity() {
     30     m[0] = 1.f;
     31     m[1] = 0.f;
     32     m[2] = 0.f;
     33     m[3] = 1.f;
     34 }
     35 
     36 void Matrix2x2::load(const float *v) {
     37     memcpy(m, v, sizeof(m));
     38 }
     39 
     40 void Matrix2x2::load(const rs_matrix2x2 *v) {
     41     memcpy(m, v->m, sizeof(m));
     42 }
     43 
     44 void Matrix2x2::loadMultiply(const rs_matrix2x2 *lhs, const rs_matrix2x2 *rhs) {
     45     for (int i=0 ; i<2 ; i++) {
     46         float ri0 = 0;
     47         float ri1 = 0;
     48         for (int j=0 ; j<2 ; j++) {
     49             const float rhs_ij = ((const Matrix2x2 *)rhs)->get(i, j);
     50             ri0 += ((const Matrix2x2 *)lhs)->get(j, 0) * rhs_ij;
     51             ri1 += ((const Matrix2x2 *)lhs)->get(j, 1) * rhs_ij;
     52         }
     53         set(i, 0, ri0);
     54         set(i, 1, ri1);
     55     }
     56 }
     57 
     58 void Matrix2x2::transpose() {
     59     float temp = m[1];
     60     m[1] = m[2];
     61     m[2] = temp;
     62 }
     63 
     64