Matrix.h revision e84a208317e0ed388fcdad1e6743c7849acb51b0 
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#ifndef ANDROID_HWUI_MATRIX_H
18#define ANDROID_HWUI_MATRIX_H
19
20#include <SkMatrix.h>
21
22#include <cutils/compiler.h>
23
24#include "Rect.h"
25
26namespace android {
27namespace uirenderer {
28
29#define SK_MATRIX_STRING "[%.2f %.2f %.2f] [%.2f %.2f %.2f] [%.2f %.2f %.2f]"
30#define SK_MATRIX_ARGS(m) \
31    (m)->get(0), (m)->get(1), (m)->get(2), \
32    (m)->get(3), (m)->get(4), (m)->get(5), \
33    (m)->get(6), (m)->get(7), (m)->get(8)
34
35#define MATRIX_4_STRING "[%.2f %.2f %.2f %.2f] [%.2f %.2f %.2f %.2f]" \
36    " [%.2f %.2f %.2f %.2f] [%.2f %.2f %.2f %.2f]"
37#define MATRIX_4_ARGS(m) \
38    (m)->data[0], (m)->data[4], (m)->data[8], (m)->data[12], \
39    (m)->data[1], (m)->data[5], (m)->data[9], (m)->data[13], \
40    (m)->data[2], (m)->data[6], (m)->data[10], (m)->data[14], \
41    (m)->data[3], (m)->data[7], (m)->data[11], (m)->data[15] \
42
43///////////////////////////////////////////////////////////////////////////////
44// Classes
45///////////////////////////////////////////////////////////////////////////////
46
47class ANDROID_API Matrix4 {
48public:
49    float data[16];
50
51    enum Entry {
52        kScaleX = 0,
53        kSkewY = 1,
54        kPerspective0 = 3,
55        kSkewX = 4,
56        kScaleY = 5,
57        kPerspective1 = 7,
58        kScaleZ = 10,
59        kTranslateX = 12,
60        kTranslateY = 13,
61        kTranslateZ = 14,
62        kPerspective2 = 15
63    };
64
65    // NOTE: The flags from kTypeIdentity to kTypePerspective
66    //       must be kept in sync with the type flags found
67    //       in SkMatrix
68    enum Type {
69        kTypeIdentity = 0,
70        kTypeTranslate = 0x1,
71        kTypeScale = 0x2,
72        kTypeAffine = 0x4,
73        kTypePerspective = 0x8,
74        kTypeRectToRect = 0x10,
75        kTypeUnknown = 0x20,
76    };
77
78    static const int sGeometryMask = 0xf;
79
80    Matrix4() {
81        loadIdentity();
82    }
83
84    Matrix4(const float* v) {
85        load(v);
86    }
87
88    Matrix4(const Matrix4& v) {
89        load(v);
90    }
91
92    Matrix4(const SkMatrix& v) {
93        load(v);
94    }
95
96    float operator[](int index) const {
97        return data[index];
98    }
99
100    float& operator[](int index) {
101        mType = kTypeUnknown;
102        return data[index];
103    }
104
105    Matrix4& operator=(const SkMatrix& v) {
106        load(v);
107        return *this;
108    }
109
110    friend bool operator==(const Matrix4& a, const Matrix4& b) {
111        return !memcmp(&a.data[0], &b.data[0], 16 * sizeof(float));
112    }
113
114    friend bool operator!=(const Matrix4& a, const Matrix4& b) {
115        return !(a == b);
116    }
117
118    void loadIdentity();
119
120    void load(const float* v);
121    void load(const Matrix4& v);
122    void load(const SkMatrix& v);
123
124    void loadInverse(const Matrix4& v);
125
126    void loadTranslate(float x, float y, float z);
127    void loadScale(float sx, float sy, float sz);
128    void loadSkew(float sx, float sy);
129    void loadRotate(float angle);
130    void loadRotate(float angle, float x, float y, float z);
131    void loadMultiply(const Matrix4& u, const Matrix4& v);
132
133    void loadOrtho(float left, float right, float bottom, float top, float near, float far);
134
135    uint8_t getType() const;
136
137    void multiply(const Matrix4& v) {
138        Matrix4 u;
139        u.loadMultiply(*this, v);
140        load(u);
141    }
142
143    void multiply(float v);
144
145    void translate(float x, float y, float z = 0) {
146        if ((getType() & sGeometryMask) <= kTypeTranslate) {
147            data[kTranslateX] += x;
148            data[kTranslateY] += y;
149            data[kTranslateZ] += z;
150            mType |= kTypeUnknown;
151        } else {
152            // Doing a translation will only affect the translate bit of the type
153            // Save the type
154            uint8_t type = mType;
155
156            Matrix4 u;
157            u.loadTranslate(x, y, z);
158            multiply(u);
159
160            // Restore the type and fix the translate bit
161            mType = type;
162            if (data[kTranslateX] != 0.0f || data[kTranslateY] != 0.0f) {
163                mType |= kTypeTranslate;
164            } else {
165                mType &= ~kTypeTranslate;
166            }
167        }
168    }
169
170    void scale(float sx, float sy, float sz) {
171        Matrix4 u;
172        u.loadScale(sx, sy, sz);
173        multiply(u);
174    }
175
176    void skew(float sx, float sy) {
177        Matrix4 u;
178        u.loadSkew(sx, sy);
179        multiply(u);
180    }
181
182    void rotate(float angle, float x, float y, float z) {
183        Matrix4 u;
184        u.loadRotate(angle, x, y, z);
185        multiply(u);
186    }
187
188    /**
189     * If the matrix is identity or translate and/or scale.
190     */
191    bool isSimple() const;
192    bool isPureTranslate() const;
193    bool isIdentity() const;
194    bool isPerspective() const;
195    bool rectToRect() const;
196    bool positiveScale() const;
197
198    bool changesBounds() const;
199
200    void copyTo(float* v) const;
201    void copyTo(SkMatrix& v) const;
202
203    float mapZ(const Vector3& orig) const;
204    void mapPoint3d(Vector3& vec) const;
205    void mapPoint(float& x, float& y) const; // 2d only
206    void mapRect(Rect& r) const; // 2d only
207
208    float getTranslateX() const;
209    float getTranslateY() const;
210
211    void decomposeScale(float& sx, float& sy) const;
212
213    void dump(const char* label = nullptr) const;
214
215    static const Matrix4& identity();
216
217private:
218    mutable uint8_t mType;
219
220    inline float get(int i, int j) const {
221        return data[i * 4 + j];
222    }
223
224    inline void set(int i, int j, float v) {
225        data[i * 4 + j] = v;
226    }
227
228    uint8_t getGeometryType() const;
229
230}; // class Matrix4
231
232///////////////////////////////////////////////////////////////////////////////
233// Types
234///////////////////////////////////////////////////////////////////////////////
235
236typedef Matrix4 mat4;
237
238}; // namespace uirenderer
239}; // namespace android
240
241#endif // ANDROID_HWUI_MATRIX_H
242