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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 <SkMatrix.h>
22 #include <cutils/compiler.h>
23 #include <iomanip>
24 #include <ostream>
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_STRING_V "[%.9f %.9f %.9f] [%.9f %.9f %.9f] [%.9f %.9f %.9f]"
31 #define SK_MATRIX_ARGS(m)                                                                      \
32     (m)->get(0), (m)->get(1), (m)->get(2), (m)->get(3), (m)->get(4), (m)->get(5), (m)->get(6), \
33             (m)->get(7), (m)->get(8)
34 
35 #define MATRIX_4_STRING                           \
36     "[%.2f %.2f %.2f %.2f] [%.2f %.2f %.2f %.2f]" \
37     " [%.2f %.2f %.2f %.2f] [%.2f %.2f %.2f %.2f]"
38 #define MATRIX_4_ARGS(m)                                                                           \
39     (m)->data[0], (m)->data[4], (m)->data[8], (m)->data[12], (m)->data[1], (m)->data[5],           \
40             (m)->data[9], (m)->data[13], (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 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() { loadIdentity(); }
81 
Matrix4(const float * v)82     explicit Matrix4(const float* v) { load(v); }
83 
Matrix4(const SkMatrix & v)84     Matrix4(const SkMatrix& v) {  // NOLINT(google-explicit-constructor)
85         load(v);
86     }
87 
88     float operator[](int index) const { return data[index]; }
89 
90     float& operator[](int index) {
91         mType = kTypeUnknown;
92         return data[index];
93     }
94 
95     Matrix4& operator=(const SkMatrix& v) {
96         load(v);
97         return *this;
98     }
99 
100     friend bool operator==(const Matrix4& a, const Matrix4& b) {
101         return !memcmp(&a.data[0], &b.data[0], 16 * sizeof(float));
102     }
103 
104     friend bool operator!=(const Matrix4& a, const Matrix4& b) { return !(a == b); }
105 
106     void loadIdentity();
107 
108     void load(const float* v);
109     void load(const SkMatrix& v);
110 
111     void loadInverse(const Matrix4& v);
112 
113     void loadTranslate(float x, float y, float z);
114     void loadScale(float sx, float sy, float sz);
115     void loadSkew(float sx, float sy);
116     void loadRotate(float angle);
117     void loadRotate(float angle, float x, float y, float z);
118     void loadMultiply(const Matrix4& u, const Matrix4& v);
119 
120     void loadOrtho(float left, float right, float bottom, float top, float near, float far);
loadOrtho(int width,int height)121     void loadOrtho(int width, int height) { loadOrtho(0, width, height, 0, -1, 1); }
122 
123     uint8_t getType() const;
124 
multiplyInverse(const Matrix4 & v)125     void multiplyInverse(const Matrix4& v) {
126         Matrix4 inv;
127         inv.loadInverse(v);
128         multiply(inv);
129     }
130 
multiply(const Matrix4 & v)131     void multiply(const Matrix4& v) {
132         if (!v.isIdentity()) {
133             Matrix4 u;
134             u.loadMultiply(*this, v);
135             *this = u;
136         }
137     }
138 
139     void multiply(float v);
140 
141     void translate(float x, float y, float z = 0) {
142         if ((getType() & sGeometryMask) <= kTypeTranslate) {
143             data[kTranslateX] += x;
144             data[kTranslateY] += y;
145             data[kTranslateZ] += z;
146             mType |= kTypeUnknown;
147         } else {
148             // Doing a translation will only affect the translate bit of the type
149             // Save the type
150             uint8_t type = mType;
151 
152             Matrix4 u;
153             u.loadTranslate(x, y, z);
154             multiply(u);
155 
156             // Restore the type and fix the translate bit
157             mType = type;
158             if (data[kTranslateX] != 0.0f || data[kTranslateY] != 0.0f) {
159                 mType |= kTypeTranslate;
160             } else {
161                 mType &= ~kTypeTranslate;
162             }
163         }
164     }
165 
scale(float sx,float sy,float sz)166     void scale(float sx, float sy, float sz) {
167         Matrix4 u;
168         u.loadScale(sx, sy, sz);
169         multiply(u);
170     }
171 
skew(float sx,float sy)172     void skew(float sx, float sy) {
173         Matrix4 u;
174         u.loadSkew(sx, sy);
175         multiply(u);
176     }
177 
rotate(float angle,float x,float y,float z)178     void rotate(float angle, float x, float y, float z) {
179         Matrix4 u;
180         u.loadRotate(angle, x, y, z);
181         multiply(u);
182     }
183 
184     /**
185      * If the matrix is identity or translate and/or scale.
186      */
187     bool isSimple() const;
188     bool isPureTranslate() const;
189     bool isIdentity() const;
190     bool isPerspective() const;
191     bool rectToRect() const;
192     bool positiveScale() const;
193 
194     bool changesBounds() const;
195 
196     void copyTo(float* v) const;
197     void copyTo(SkMatrix& v) const;
198 
199     float mapZ(const Vector3& orig) const;
200     void mapPoint3d(Vector3& vec) const;
201     void mapPoint(float& x, float& y) const;  // 2d only
202     void mapRect(Rect& r) const;              // 2d only
203 
204     float getTranslateX() const;
205     float getTranslateY() const;
206 
207     void decomposeScale(float& sx, float& sy) const;
208 
209     void dump(const char* label = nullptr) const;
210 
211     friend std::ostream& operator<<(std::ostream& os, const Matrix4& matrix) {
212         if (matrix.isSimple()) {
213             os << "offset " << matrix.getTranslateX() << "x" << matrix.getTranslateY();
214             if (!matrix.isPureTranslate()) {
215                 os << ", scale " << matrix[kScaleX] << "x" << matrix[kScaleY];
216             }
217         } else {
218             os << "[" << matrix[0];
219             for (int i = 1; i < 16; i++) {
220                 os << ", " << matrix[i];
221             }
222             os << "]";
223         }
224         return os;
225     }
226 
227     static const Matrix4& identity();
228 
invalidateType()229     void invalidateType() { mType = kTypeUnknown; }
230 
231 private:
232     mutable uint8_t mType;
233 
get(int i,int j)234     inline float get(int i, int j) const { return data[i * 4 + j]; }
235 
set(int i,int j,float v)236     inline void set(int i, int j, float v) { data[i * 4 + j] = v; }
237 
238     uint8_t getGeometryType() const;
239 
240 };  // class Matrix4
241 
242 ///////////////////////////////////////////////////////////////////////////////
243 // Types
244 ///////////////////////////////////////////////////////////////////////////////
245 
246 typedef Matrix4 mat4;
247 
248 }  // namespace uirenderer
249 }  // namespace android
250