Matrix.cpp revision 079ba2c85b15e882629b8d188f5fbdb42f7f8eea 
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::loadInverse(const Matrix4& v) {
97    double scale = 1.0 /
98            (v.data[0]  * ((double) v.data[5]  * v.data[15] - (double) v.data[13] * v.data[7]) +
99             v.data[4]  * ((double) v.data[13] * v.data[3]  - (double) v.data[1]  * v.data[15]) +
100             v.data[12] * ((double) v.data[1]  * v.data[7]  - (double) v.data[5]  * v.data[3]));
101
102    data[0]  = (v.data[5] * v.data[15] - v.data[13] * v.data[7])  * scale;
103    data[4]  = (v.data[12] * v.data[7] - v.data[4]  * v.data[15]) * scale;
104    data[12] = (v.data[4] * v.data[13] - v.data[12] * v.data[5])  * scale;
105
106    data[1]  = (v.data[13] * v.data[3] - v.data[1]  * v.data[15]) * scale;
107    data[5]  = (v.data[0] * v.data[15] - v.data[12] * v.data[3])  * scale;
108    data[13] = (v.data[12] * v.data[1] - v.data[0]  * v.data[13]) * scale;
109
110    data[3]  = (v.data[1] * v.data[7] - v.data[5] * v.data[3]) * scale;
111    data[7]  = (v.data[4] * v.data[3] - v.data[0] * v.data[7]) * scale;
112    data[15] = (v.data[0] * v.data[5] - v.data[4] * v.data[1]) * scale;
113}
114
115void Matrix4::copyTo(float* v) const {
116    memcpy(v, data, sizeof(data));
117}
118
119float Matrix4::getTranslateX() {
120    return data[12];
121}
122
123float Matrix4::getTranslateY() {
124    return data[13];
125}
126
127void Matrix4::loadTranslate(float x, float y, float z) {
128    loadIdentity();
129    data[12] = x;
130    data[13] = y;
131    data[14] = z;
132}
133
134void Matrix4::loadScale(float sx, float sy, float sz) {
135    loadIdentity();
136    data[0]  = sx;
137    data[5]  = sy;
138    data[10] = sz;
139}
140
141void Matrix4::loadRotate(float angle, float x, float y, float z) {
142    data[3]  = 0.0f;
143    data[7]  = 0.0f;
144    data[11] = 0.0f;
145    data[12] = 0.0f;
146    data[13] = 0.0f;
147    data[14] = 0.0f;
148    data[15] = 1.0f;
149
150    angle *= float(M_PI / 180.0f);
151    float c = cosf(angle);
152    float s = sinf(angle);
153
154    const float length = sqrtf(x * x + y * y + z * z);
155    const float nc = 1.0f - c;
156    const float xy = x * y;
157    const float yz = y * z;
158    const float zx = z * x;
159    const float xs = x * s;
160    const float ys = y * s;
161    const float zs = z * s;
162
163    data[0]  = x * x * nc +  c;
164    data[4]  =    xy * nc - zs;
165    data[8]  =    zx * nc + ys;
166    data[1]  =    xy * nc + zs;
167    data[5]  = y * y * nc +  c;
168    data[9]  =    yz * nc - xs;
169    data[2]  =    zx * nc - ys;
170    data[6]  =    yz * nc + xs;
171    data[10] = z * z * nc +  c;
172}
173
174void Matrix4::loadMultiply(const Matrix4& u, const Matrix4& v) {
175    for (int i = 0 ; i < 4 ; i++) {
176        float x = 0;
177        float y = 0;
178        float z = 0;
179        float w = 0;
180
181        for (int j = 0 ; j < 4 ; j++) {
182            const float e = v.get(i, j);
183            x += u.get(j, 0) * e;
184            y += u.get(j, 1) * e;
185            z += u.get(j, 2) * e;
186            w += u.get(j, 3) * e;
187        }
188
189        set(i, 0, x);
190        set(i, 1, y);
191        set(i, 2, z);
192        set(i, 3, w);
193    }
194}
195
196void Matrix4::loadOrtho(float left, float right, float bottom, float top, float near, float far) {
197    loadIdentity();
198    data[0]  = 2.0f / (right - left);
199    data[5]  = 2.0f / (top - bottom);
200    data[10] = -2.0f / (far - near);
201    data[12] = -(right + left) / (right - left);
202    data[13] = -(top + bottom) / (top - bottom);
203    data[14] = -(far + near) / (far - near);
204}
205
206#define MUL_ADD_STORE(a, b, c) a = (a) * (b) + (c)
207
208void Matrix4::mapRect(Rect& r) const {
209    const float sx = data[0];
210    const float sy = data[5];
211
212    const float tx = data[12];
213    const float ty = data[13];
214
215    MUL_ADD_STORE(r.left, sx, tx);
216    MUL_ADD_STORE(r.right, sx, tx);
217    MUL_ADD_STORE(r.top, sy, ty);
218    MUL_ADD_STORE(r.bottom, sy, ty);
219}
220
221void Matrix4::dump() const {
222    LOGD("Matrix4[");
223    LOGD("  %f %f %f %f", data[0], data[4], data[ 8], data[12]);
224    LOGD("  %f %f %f %f", data[1], data[5], data[ 9], data[13]);
225    LOGD("  %f %f %f %f", data[2], data[6], data[10], data[14]);
226    LOGD("  %f %f %f %f", data[3], data[7], data[11], data[15]);
227    LOGD("]");
228}
229
230}; // namespace uirenderer
231}; // namespace android
232