Matrix.cpp revision 5cbbce535744b89df5ecea95de21ee3733298260 
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 "OpenGLRenderer"
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    data[0]  = 1.0f;
34    data[1]  = 0.0f;
35    data[2]  = 0.0f;
36    data[3]  = 0.0f;
37
38    data[4]  = 0.0f;
39    data[5]  = 1.0f;
40    data[6]  = 0.0f;
41    data[7]  = 0.0f;
42
43    data[8]  = 0.0f;
44    data[9]  = 0.0f;
45    data[10] = 1.0f;
46    data[11] = 0.0f;
47
48    data[12] = 0.0f;
49    data[13] = 0.0f;
50    data[14] = 0.0f;
51    data[15] = 1.0f;
52}
53
54void Matrix4::load(const float* v) {
55    memcpy(data, v, sizeof(data));
56}
57
58void Matrix4::load(const Matrix4& v) {
59    memcpy(data, v.data, sizeof(data));
60}
61
62void Matrix4::load(const SkMatrix& v) {
63    memset(data, 0, sizeof(data));
64
65    data[0]  = v[SkMatrix::kMScaleX];
66    data[4]  = v[SkMatrix::kMSkewX];
67    data[12] = v[SkMatrix::kMTransX];
68
69    data[1]  = v[SkMatrix::kMSkewY];
70    data[5]  = v[SkMatrix::kMScaleY];
71    data[13] = v[SkMatrix::kMTransY];
72
73    data[3]  = v[SkMatrix::kMPersp0];
74    data[7]  = v[SkMatrix::kMPersp1];
75    data[15] = v[SkMatrix::kMPersp2];
76
77    data[10] = 1.0f;
78}
79
80void Matrix4::copyTo(SkMatrix& v) const {
81    v.reset();
82
83    v.set(SkMatrix::kMScaleX, data[0]);
84    v.set(SkMatrix::kMSkewX,  data[4]);
85    v.set(SkMatrix::kMTransX, data[12]);
86
87    v.set(SkMatrix::kMSkewY,  data[1]);
88    v.set(SkMatrix::kMScaleY, data[5]);
89    v.set(SkMatrix::kMTransY, data[13]);
90
91    v.set(SkMatrix::kMPersp0, data[3]);
92    v.set(SkMatrix::kMPersp1, data[7]);
93    v.set(SkMatrix::kMPersp2, data[15]);
94}
95
96void Matrix4::copyTo(float* v) const {
97    memcpy(v, data, sizeof(data));
98}
99
100float Matrix4::getTranslateX() {
101    return data[12];
102}
103
104float Matrix4::getTranslateY() {
105    return data[13];
106}
107
108void Matrix4::loadTranslate(float x, float y, float z) {
109    loadIdentity();
110    data[12] = x;
111    data[13] = y;
112    data[14] = z;
113}
114
115void Matrix4::loadScale(float sx, float sy, float sz) {
116    loadIdentity();
117    data[0]  = sx;
118    data[5]  = sy;
119    data[10] = sz;
120}
121
122void Matrix4::loadRotate(float angle, float x, float y, float z) {
123    data[3]  = 0.0f;
124    data[7]  = 0.0f;
125    data[11] = 0.0f;
126    data[12] = 0.0f;
127    data[13] = 0.0f;
128    data[14] = 0.0f;
129    data[15] = 1.0f;
130
131    angle *= float(M_PI / 180.0f);
132    float c = cosf(angle);
133    float s = sinf(angle);
134
135    const float length = sqrtf(x * x + y * y + z * z);
136    const float nc = 1.0f - c;
137    const float xy = x * y;
138    const float yz = y * z;
139    const float zx = z * x;
140    const float xs = x * s;
141    const float ys = y * s;
142    const float zs = z * s;
143
144    data[0]  = x * x * nc +  c;
145    data[4]  =    xy * nc - zs;
146    data[8]  =    zx * nc + ys;
147    data[1]  =    xy * nc + zs;
148    data[5]  = y * y * nc +  c;
149    data[9]  =    yz * nc - xs;
150    data[2]  =    zx * nc - ys;
151    data[6]  =    yz * nc + xs;
152    data[10] = z * z * nc +  c;
153}
154
155void Matrix4::loadMultiply(const Matrix4& u, const Matrix4& v) {
156    for (int i = 0 ; i < 4 ; i++) {
157        float x = 0;
158        float y = 0;
159        float z = 0;
160        float w = 0;
161
162        for (int j = 0 ; j < 4 ; j++) {
163            const float e = v.get(i, j);
164            x += u.get(j, 0) * e;
165            y += u.get(j, 1) * e;
166            z += u.get(j, 2) * e;
167            w += u.get(j, 3) * e;
168        }
169
170        set(i, 0, x);
171        set(i, 1, y);
172        set(i, 2, z);
173        set(i, 3, w);
174    }
175}
176
177void Matrix4::loadOrtho(float left, float right, float bottom, float top, float near, float far) {
178    loadIdentity();
179    data[0]  = 2.0f / (right - left);
180    data[5]  = 2.0f / (top - bottom);
181    data[10] = -2.0f / (far - near);
182    data[12] = -(right + left) / (right - left);
183    data[13] = -(top + bottom) / (top - bottom);
184    data[14] = -(far + near) / (far - near);
185}
186
187#define MUL_ADD_STORE(a, b, c) a = (a) * (b) + (c)
188
189void Matrix4::mapRect(Rect& r) const {
190    const float sx = data[0];
191    const float sy = data[5];
192
193    const float tx = data[12];
194    const float ty = data[13];
195
196    MUL_ADD_STORE(r.left, sx, tx);
197    MUL_ADD_STORE(r.right, sx, tx);
198    MUL_ADD_STORE(r.top, sy, ty);
199    MUL_ADD_STORE(r.bottom, sy, ty);
200}
201
202void Matrix4::dump() const {
203    LOGD("Matrix4[");
204    LOGD("  %f %f %f %f", data[0], data[4], data[ 8], data[12]);
205    LOGD("  %f %f %f %f", data[1], data[5], data[ 9], data[13]);
206    LOGD("  %f %f %f %f", data[2], data[6], data[10], data[14]);
207    LOGD("  %f %f %f %f", data[3], data[7], data[11], data[15]);
208    LOGD("]");
209}
210
211}; // namespace uirenderer
212}; // namespace android
213