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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 #pragma once
18 
19 #include "Rect.h"
20 
21 #include <cutils/compiler.h>
22 #include <iomanip>
23 #include <ostream>
24 #include <SkMatrix.h>
25 
26 namespace android {
27 namespace 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 
47 class ANDROID_API Matrix4 {
48 public:
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 
Matrix4()80     Matrix4() {
81         loadIdentity();
82     }
83 
Matrix4(const float * v)84     Matrix4(const float* v) {
85         load(v);
86     }
87 
Matrix4(const SkMatrix & v)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);
loadOrtho(int width,int height)129     void loadOrtho(int width, int height) {
130         loadOrtho(0, width, height, 0, -1, 1);
131     }
132 
133     uint8_t getType() const;
134 
multiplyInverse(const Matrix4 & v)135     void multiplyInverse(const Matrix4& v) {
136         Matrix4 inv;
137         inv.loadInverse(v);
138         multiply(inv);
139     }
140 
multiply(const Matrix4 & v)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 
scale(float sx,float sy,float sz)176     void scale(float sx, float sy, float sz) {
177         Matrix4 u;
178         u.loadScale(sx, sy, sz);
179         multiply(u);
180     }
181 
skew(float sx,float sy)182     void skew(float sx, float sy) {
183         Matrix4 u;
184         u.loadSkew(sx, sy);
185         multiply(u);
186     }
187 
rotate(float angle,float x,float y,float z)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     friend std::ostream& operator<<(std::ostream& os, const Matrix4& matrix) {
222         if (matrix.isSimple()) {
223             os << "offset " << matrix.getTranslateX() << "x" << matrix.getTranslateY();
224             if (!matrix.isPureTranslate()) {
225                 os << ", scale " << matrix[kScaleX] << "x" << matrix[kScaleY];
226             }
227         } else {
228             os << "[" << matrix[0];
229             for (int i = 1; i < 16; i++) {
230                 os << ", " << matrix[i];
231             }
232             os << "]";
233         }
234         return os;
235     }
236 
237     static const Matrix4& identity();
238 
invalidateType()239     void invalidateType() { mType = kTypeUnknown; }
240 
241 private:
242     mutable uint8_t mType;
243 
get(int i,int j)244     inline float get(int i, int j) const {
245         return data[i * 4 + j];
246     }
247 
set(int i,int j,float v)248     inline void set(int i, int j, float v) {
249         data[i * 4 + j] = v;
250     }
251 
252     uint8_t getGeometryType() const;
253 
254 }; // class Matrix4
255 
256 ///////////////////////////////////////////////////////////////////////////////
257 // Types
258 ///////////////////////////////////////////////////////////////////////////////
259 
260 typedef Matrix4 mat4;
261 
262 }; // namespace uirenderer
263 }; // namespace android
264 
265