Transform.h revision 81bac09fa6b01dd1495644d9c825c3666762fced 
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
26namespace android {
27
28class Region;
29
30// ---------------------------------------------------------------------------
31
32class Transform
33{
34public:
35                    Transform();
36                    Transform(const Transform&  other);
37           explicit Transform(uint32_t orientation);
38                    ~Transform();
39
40            // FIXME: must match OVERLAY_TRANSFORM_*, pull from hardware.h
41            enum orientation_flags {
42                ROT_0   = 0x00000000,
43                FLIP_H  = 0x00000001,
44                FLIP_V  = 0x00000002,
45                ROT_90  = 0x00000004,
46                ROT_180 = FLIP_H|FLIP_V,
47                ROT_270 = ROT_180|ROT_90,
48                ROT_INVALID = 0x80
49            };
50
51            enum type_mask {
52                IDENTITY            = 0,
53                TRANSLATE           = 0x1,
54                ROTATE              = 0x2,
55                SCALE               = 0x4,
56                UNKNOWN             = 0x8
57            };
58
59            // query the transform
60            bool        transformed() const;
61            bool        preserveRects() const;
62            uint32_t    getType() const;
63            uint32_t    getOrientation() const;
64
65            float const* operator [] (int i) const;  // returns column i
66            int     tx() const;
67            int     ty() const;
68
69            // modify the transform
70            void        reset();
71            void        set(float tx, float ty);
72            void        set(float a, float b, float c, float d);
73            status_t    set(uint32_t flags, float w, float h);
74
75            // transform data
76            Rect    makeBounds(int w, int h) const;
77            void    transform(float* point, int x, int y) const;
78            Region  transform(const Region& reg) const;
79            Transform operator * (const Transform& rhs) const;
80
81            // for debugging
82            void dump(const char* name) const;
83
84private:
85    struct vec3 {
86        float v[3];
87        inline vec3() { }
88        inline vec3(float a, float b, float c) {
89            v[0] = a; v[1] = b; v[2] = c;
90        }
91        inline float operator [] (int i) const { return v[i]; }
92        inline float& operator [] (int i) { return v[i]; }
93    };
94    struct vec2 {
95        float v[2];
96        inline vec2() { }
97        inline vec2(float a, float b) {
98            v[0] = a; v[1] = b;
99        }
100        inline float operator [] (int i) const { return v[i]; }
101        inline float& operator [] (int i) { return v[i]; }
102    };
103    struct mat33 {
104        vec3 v[3];
105        inline const vec3& operator [] (int i) const { return v[i]; }
106        inline vec3& operator [] (int i) { return v[i]; }
107    };
108
109    enum { UNKNOWN_TYPE = 0x80000000 };
110
111    // assumes the last row is < 0 , 0 , 1 >
112    vec2 transform(const vec2& v) const;
113    vec3 transform(const vec3& v) const;
114    Rect transform(const Rect& bounds) const;
115    uint32_t type() const;
116    static bool absIsOne(float f);
117    static bool isZero(float f);
118
119    mat33               mMatrix;
120    mutable uint32_t    mType;
121};
122
123// ---------------------------------------------------------------------------
124}; // namespace android
125
126#endif /* ANDROID_TRANSFORM_H */
127