Matrix.cpp revision 9d5316e3f56d138504565ff311145ac01621dff4
1/* 2 * Copyright (C) 2010 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#define LOG_TAG "Matrix" 18 19#include <math.h> 20#include <stdlib.h> 21#include <string.h> 22 23#include <utils/Log.h> 24 25#include <SkMatrix.h> 26 27#include "Matrix.h" 28 29namespace android { 30namespace uirenderer { 31 32void Matrix4::loadIdentity() { 33 mMat[0] = 1.0f; 34 mMat[1] = 0.0f; 35 mMat[2] = 0.0f; 36 mMat[3] = 0.0f; 37 38 mMat[4] = 0.0f; 39 mMat[5] = 1.0f; 40 mMat[6] = 0.0f; 41 mMat[7] = 0.0f; 42 43 mMat[8] = 0.0f; 44 mMat[9] = 0.0f; 45 mMat[10] = 1.0f; 46 mMat[11] = 0.0f; 47 48 mMat[12] = 0.0f; 49 mMat[13] = 0.0f; 50 mMat[14] = 0.0f; 51 mMat[15] = 1.0f; 52} 53 54void Matrix4::load(const float* v) { 55 memcpy(mMat, v, sizeof(mMat)); 56} 57 58void Matrix4::load(const Matrix4& v) { 59 memcpy(mMat, v.mMat, sizeof(mMat)); 60} 61 62void Matrix4::load(const SkMatrix& v) { 63 memset(mMat, 0, sizeof(mMat)); 64 65 mMat[0] = v[SkMatrix::kMScaleX]; 66 mMat[4] = v[SkMatrix::kMSkewX]; 67 mMat[12] = v[SkMatrix::kMTransX]; 68 69 mMat[1] = v[SkMatrix::kMSkewY]; 70 mMat[5] = v[SkMatrix::kMScaleY]; 71 mMat[13] = v[SkMatrix::kMTransY]; 72 73 mMat[3] = v[SkMatrix::kMPersp0]; 74 mMat[7] = v[SkMatrix::kMPersp1]; 75 mMat[15] = v[SkMatrix::kMPersp2]; 76 77 mMat[10] = 1.0f; 78} 79 80void Matrix4::copyTo(SkMatrix& v) const { 81 v.reset(); 82 83 v.set(SkMatrix::kMScaleX, mMat[0]); 84 v.set(SkMatrix::kMSkewX, mMat[4]); 85 v.set(SkMatrix::kMTransX, mMat[12]); 86 87 v.set(SkMatrix::kMSkewY, mMat[1]); 88 v.set(SkMatrix::kMScaleY, mMat[5]); 89 v.set(SkMatrix::kMTransY, mMat[13]); 90 91 v.set(SkMatrix::kMPersp0, mMat[3]); 92 v.set(SkMatrix::kMPersp1, mMat[7]); 93 v.set(SkMatrix::kMPersp2, mMat[15]); 94} 95 96void Matrix4::copyTo(float* v) const { 97 memcpy(v, mMat, sizeof(mMat)); 98} 99 100void Matrix4::loadTranslate(float x, float y, float z) { 101 loadIdentity(); 102 mMat[12] = x; 103 mMat[13] = y; 104 mMat[14] = z; 105} 106 107void Matrix4::loadScale(float sx, float sy, float sz) { 108 loadIdentity(); 109 mMat[0] = sx; 110 mMat[5] = sy; 111 mMat[10] = sz; 112} 113 114void Matrix4::loadRotate(float angle, float x, float y, float z) { 115 mMat[3] = 0.0f; 116 mMat[7] = 0.0f; 117 mMat[11] = 0.0f; 118 mMat[12] = 0.0f; 119 mMat[13] = 0.0f; 120 mMat[14] = 0.0f; 121 mMat[15] = 1.0f; 122 123 angle *= float(M_PI / 180.0f); 124 float c = cosf(angle); 125 float s = sinf(angle); 126 127 const float length = sqrtf(x * x + y * y + z * z); 128 const float nc = 1.0f - c; 129 const float xy = x * y; 130 const float yz = y * z; 131 const float zx = z * x; 132 const float xs = x * s; 133 const float ys = y * s; 134 const float zs = z * s; 135 136 mMat[0] = x * x * nc + c; 137 mMat[4] = xy * nc - zs; 138 mMat[8] = zx * nc + ys; 139 mMat[1] = xy * nc + zs; 140 mMat[5] = y * y * nc + c; 141 mMat[9] = yz * nc - xs; 142 mMat[2] = zx * nc - ys; 143 mMat[6] = yz * nc + xs; 144 mMat[10] = z * z * nc + c; 145} 146 147void Matrix4::loadMultiply(const Matrix4& u, const Matrix4& v) { 148 for (int i = 0 ; i < 4 ; i++) { 149 float x = 0; 150 float y = 0; 151 float z = 0; 152 float w = 0; 153 154 for (int j = 0 ; j < 4 ; j++) { 155 const float e = v.get(i,j); 156 x += u.get(j, 0) * e; 157 y += u.get(j, 1) * e; 158 z += u.get(j, 2) * e; 159 w += u.get(j, 3) * e; 160 } 161 162 set(i, 0, x); 163 set(i, 1, y); 164 set(i, 2, z); 165 set(i, 3, w); 166 } 167} 168 169void Matrix4::loadOrtho(float left, float right, float bottom, float top, float near, float far) { 170 loadIdentity(); 171 mMat[0] = 2.0f / (right - left); 172 mMat[5] = 2.0f / (top - bottom); 173 mMat[10] = -2.0f / (far - near); 174 mMat[12] = -(right + left) / (right - left); 175 mMat[13] = -(top + bottom) / (top - bottom); 176 mMat[14] = -(far + near) / (far - near); 177} 178 179#define MUL_ADD_STORE(a, b, c) a = (a) * (b) + (c) 180 181void Matrix4::mapRect(Rect& r) const { 182 const float sx = mMat[0]; 183 const float sy = mMat[5]; 184 185 const float tx = mMat[12]; 186 const float ty = mMat[13]; 187 188 MUL_ADD_STORE(r.left, sx, tx); 189 MUL_ADD_STORE(r.right, sx, tx); 190 MUL_ADD_STORE(r.top, sy, ty); 191 MUL_ADD_STORE(r.bottom, sy, ty); 192} 193 194void Matrix4::dump() const { 195 LOGD("Matrix4["); 196 LOGD(" %f %f %f %f", mMat[0], mMat[4], mMat[ 8], mMat[12]); 197 LOGD(" %f %f %f %f", mMat[1], mMat[5], mMat[ 9], mMat[13]); 198 LOGD(" %f %f %f %f", mMat[2], mMat[6], mMat[10], mMat[14]); 199 LOGD(" %f %f %f %f", mMat[3], mMat[7], mMat[11], mMat[15]); 200 LOGD("]"); 201} 202 203}; // namespace uirenderer 204}; // namespace android 205