1 /*
2  * Copyright (C) 2007 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_TRANSFORM_H
18 #define ANDROID_TRANSFORM_H
19 
20 #include <stdint.h>
21 #include <sys/types.h>
22 
23 #include <ui/Point.h>
24 #include <ui/Rect.h>
25 #include <math/vec2.h>
26 #include <math/vec3.h>
27 
28 #include <gui/ISurfaceComposer.h>
29 
30 #include <hardware/hardware.h>
31 
32 namespace android {
33 
34 class Region;
35 
36 // ---------------------------------------------------------------------------
37 
38 class Transform
39 {
40 public:
41                     Transform();
42                     Transform(const Transform&  other);
43            explicit Transform(uint32_t orientation);
44                     ~Transform();
45 
46             enum orientation_flags {
47                 ROT_0   = 0x00000000,
48                 FLIP_H  = HAL_TRANSFORM_FLIP_H,
49                 FLIP_V  = HAL_TRANSFORM_FLIP_V,
50                 ROT_90  = HAL_TRANSFORM_ROT_90,
51                 ROT_180 = FLIP_H|FLIP_V,
52                 ROT_270 = ROT_180|ROT_90,
53                 ROT_INVALID = 0x80
54             };
55 
56             static orientation_flags fromRotation(ISurfaceComposer::Rotation rotation);
57 
58             enum type_mask {
59                 IDENTITY            = 0,
60                 TRANSLATE           = 0x1,
61                 ROTATE              = 0x2,
62                 SCALE               = 0x4,
63                 UNKNOWN             = 0x8
64             };
65 
66             // query the transform
67             bool        preserveRects() const;
68             uint32_t    getType() const;
69             uint32_t    getOrientation() const;
70 
71             const vec3& operator [] (size_t i) const;  // returns column i
72             float   tx() const;
73             float   ty() const;
74 
75             // modify the transform
76             void        reset();
77             void        set(float tx, float ty);
78             void        set(float a, float b, float c, float d);
79             status_t    set(uint32_t flags, float w, float h);
80 
81             // transform data
82             Rect    makeBounds(int w, int h) const;
83             vec2    transform(int x, int y) const;
84             Region  transform(const Region& reg) const;
85             Rect    transform(const Rect& bounds,
86                     bool roundOutwards = false) const;
87             FloatRect transform(const FloatRect& bounds) const;
88             Transform operator * (const Transform& rhs) const;
89             // assumes the last row is < 0 , 0 , 1 >
90             vec2 transform(const vec2& v) const;
91             vec3 transform(const vec3& v) const;
92 
93             Transform inverse() const;
94 
95             // for debugging
96             void dump(const char* name) const;
97 
98 private:
99     struct mat33 {
100         vec3 v[3];
101         inline const vec3& operator [] (int i) const { return v[i]; }
102         inline vec3& operator [] (int i) { return v[i]; }
103     };
104 
105     enum { UNKNOWN_TYPE = 0x80000000 };
106 
107     uint32_t type() const;
108     static bool absIsOne(float f);
109     static bool isZero(float f);
110 
111     mat33               mMatrix;
112     mutable uint32_t    mType;
113 };
114 
115 // ---------------------------------------------------------------------------
116 }; // namespace android
117 
118 #endif /* ANDROID_TRANSFORM_H */
119