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