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            typedef int32_t fixed1616;
41
42            // FIXME: must match OVERLAY_TRANSFORM_*, pull from hardware.h
43            enum orientation_flags {
44                ROT_0   = 0x00000000,
45                FLIP_H  = 0x00000001,
46                FLIP_V  = 0x00000002,
47                ROT_90  = 0x00000004,
48                ROT_180 = FLIP_H|FLIP_V,
49                ROT_270 = ROT_180|ROT_90,
50                ROT_INVALID = 0x80
51            };
52
53            enum type_mask {
54                IDENTITY            = 0,
55                TRANSLATE           = 0x1,
56                ROTATE              = 0x2,
57                SCALE               = 0x4,
58                UNKNOWN             = 0x8
59            };
60
61            // query the transform
62            bool        transformed() const;
63            bool        preserveRects() const;
64            uint32_t    getType() const;
65            uint32_t    getOrientation() const;
66
67            float const* operator [] (int i) const;  // returns column i
68            int     tx() const;
69            int     ty() const;
70
71            // modify the transform
72            void        reset();
73            void        set(float tx, float ty);
74            void        set(float a, float b, float c, float d);
75            status_t    set(uint32_t flags, float w, float h);
76
77            // transform data
78            Rect    makeBounds(int w, int h) const;
79            void    transform(fixed1616* point, int x, int y) const;
80            Region  transform(const Region& reg) const;
81            Transform operator * (const Transform& rhs) const;
82
83            // for debugging
84            void dump(const char* name) const;
85
86private:
87    struct vec3 {
88        float v[3];
89        inline vec3() { }
90        inline vec3(float a, float b, float c) {
91            v[0] = a; v[1] = b; v[2] = c;
92        }
93        inline float operator [] (int i) const { return v[i]; }
94        inline float& operator [] (int i) { return v[i]; }
95    };
96    struct vec2 {
97        float v[2];
98        inline vec2() { }
99        inline vec2(float a, float b) {
100            v[0] = a; v[1] = b;
101        }
102        inline float operator [] (int i) const { return v[i]; }
103        inline float& operator [] (int i) { return v[i]; }
104    };
105    struct mat33 {
106        vec3 v[3];
107        inline const vec3& operator [] (int i) const { return v[i]; }
108        inline vec3& operator [] (int i) { return v[i]; }
109    };
110
111    enum { UNKNOWN_TYPE = 0x80000000 };
112
113    // assumes the last row is < 0 , 0 , 1 >
114    vec2 transform(const vec2& v) const;
115    vec3 transform(const vec3& v) const;
116    Rect transform(const Rect& bounds) const;
117    uint32_t type() const;
118    static bool absIsOne(float f);
119    static bool isZero(float f);
120
121    mat33               mMatrix;
122    mutable uint32_t    mType;
123};
124
125// ---------------------------------------------------------------------------
126}; // namespace android
127
128#endif /* ANDROID_TRANSFORM_H */
129