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 28 void Matrix2x2::loadIdentity() { 29 m[0] = 1.f; 30 m[1] = 0.f; 31 m[2] = 0.f; 32 m[3] = 1.f; 33 } 34 35 void Matrix2x2::load(const float *v) { 36 memcpy(m, v, sizeof(m)); 37 } 38 39 void Matrix2x2::load(const rs_matrix2x2 *v) { 40 memcpy(m, v->m, sizeof(m)); 41 } 42 43 void Matrix2x2::loadMultiply(const rs_matrix2x2 *lhs, const rs_matrix2x2 *rhs) { 44 // Use a temporary variable to support the case where one of the inputs 45 // is also the destination, e.g. left.loadMultiply(left, right); 46 Matrix2x2 temp; 47 for (int i=0 ; i<2 ; i++) { 48 float ri0 = 0; 49 float ri1 = 0; 50 for (int j=0 ; j<2 ; j++) { 51 const float rhs_ij = ((const Matrix2x2 *)rhs)->get(i, j); 52 ri0 += ((const Matrix2x2 *)lhs)->get(j, 0) * rhs_ij; 53 ri1 += ((const Matrix2x2 *)lhs)->get(j, 1) * rhs_ij; 54 } 55 temp.set(i, 0, ri0); 56 temp.set(i, 1, ri1); 57 } 58 load(&temp); 59 } 60 61 void Matrix2x2::transpose() { 62 float temp = m[1]; 63 m[1] = m[2]; 64 m[2] = temp; 65 } 66 67 } // namespace renderscript 68 } // namespace android 69
