Matrix.h revision d2dfd8f128b632ed99418ab2b32949c939a9a369 
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 SkMatrix& v) {
89        load(v);
90    }
91
92    float operator[](int index) const {
93        return data[index];
94    }
95
96    float& operator[](int index) {
97        mType = kTypeUnknown;
98        return data[index];
99    }
100
101    Matrix4& operator=(const SkMatrix& v) {
102        load(v);
103        return *this;
104    }
105
106    friend bool operator==(const Matrix4& a, const Matrix4& b) {
107        return !memcmp(&a.data[0], &b.data[0], 16 * sizeof(float));
108    }
109
110    friend bool operator!=(const Matrix4& a, const Matrix4& b) {
111        return !(a == b);
112    }
113
114    void loadIdentity();
115
116    void load(const float* v);
117    void load(const SkMatrix& v);
118
119    void loadInverse(const Matrix4& v);
120
121    void loadTranslate(float x, float y, float z);
122    void loadScale(float sx, float sy, float sz);
123    void loadSkew(float sx, float sy);
124    void loadRotate(float angle);
125    void loadRotate(float angle, float x, float y, float z);
126    void loadMultiply(const Matrix4& u, const Matrix4& v);
127
128    void loadOrtho(float left, float right, float bottom, float top, float near, float far);
129    void loadOrtho(int width, int height) {
130        loadOrtho(0, width, height, 0, -1, 1);
131    }
132
133    uint8_t getType() const;
134
135    void multiplyInverse(const Matrix4& v) {
136        Matrix4 inv;
137        inv.loadInverse(v);
138        multiply(inv);
139    }
140
141    void multiply(const Matrix4& v) {
142        if (!v.isIdentity()) {
143            Matrix4 u;
144            u.loadMultiply(*this, v);
145            *this = u;
146        }
147    }
148
149    void multiply(float v);
150
151    void translate(float x, float y, float z = 0) {
152        if ((getType() & sGeometryMask) <= kTypeTranslate) {
153            data[kTranslateX] += x;
154            data[kTranslateY] += y;
155            data[kTranslateZ] += z;
156            mType |= kTypeUnknown;
157        } else {
158            // Doing a translation will only affect the translate bit of the type
159            // Save the type
160            uint8_t type = mType;
161
162            Matrix4 u;
163            u.loadTranslate(x, y, z);
164            multiply(u);
165
166            // Restore the type and fix the translate bit
167            mType = type;
168            if (data[kTranslateX] != 0.0f || data[kTranslateY] != 0.0f) {
169                mType |= kTypeTranslate;
170            } else {
171                mType &= ~kTypeTranslate;
172            }
173        }
174    }
175
176    void scale(float sx, float sy, float sz) {
177        Matrix4 u;
178        u.loadScale(sx, sy, sz);
179        multiply(u);
180    }
181
182    void skew(float sx, float sy) {
183        Matrix4 u;
184        u.loadSkew(sx, sy);
185        multiply(u);
186    }
187
188    void rotate(float angle, float x, float y, float z) {
189        Matrix4 u;
190        u.loadRotate(angle, x, y, z);
191        multiply(u);
192    }
193
194    /**
195     * If the matrix is identity or translate and/or scale.
196     */
197    bool isSimple() const;
198    bool isPureTranslate() const;
199    bool isIdentity() const;
200    bool isPerspective() const;
201    bool rectToRect() const;
202    bool positiveScale() const;
203
204    bool changesBounds() const;
205
206    void copyTo(float* v) const;
207    void copyTo(SkMatrix& v) const;
208
209    float mapZ(const Vector3& orig) const;
210    void mapPoint3d(Vector3& vec) const;
211    void mapPoint(float& x, float& y) const; // 2d only
212    void mapRect(Rect& r) const; // 2d only
213
214    float getTranslateX() const;
215    float getTranslateY() const;
216
217    void decomposeScale(float& sx, float& sy) const;
218
219    void dump(const char* label = nullptr) const;
220
221    static const Matrix4& identity();
222
223private:
224    mutable uint8_t mType;
225
226    inline float get(int i, int j) const {
227        return data[i * 4 + j];
228    }
229
230    inline void set(int i, int j, float v) {
231        data[i * 4 + j] = v;
232    }
233
234    uint8_t getGeometryType() const;
235
236}; // class Matrix4
237
238///////////////////////////////////////////////////////////////////////////////
239// Types
240///////////////////////////////////////////////////////////////////////////////
241
242typedef Matrix4 mat4;
243
244}; // namespace uirenderer
245}; // namespace android
246
247#endif // ANDROID_HWUI_MATRIX_H
248