Transform.h revision 0694d0f3b3d016b9eedda13c447e8e7735a4a177 
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
26#include <hardware/hardware.h>
27
28namespace android {
29
30class Region;
31
32// ---------------------------------------------------------------------------
33
34class Transform
35{
36public:
37                    Transform();
38                    Transform(const Transform&  other);
39           explicit Transform(uint32_t orientation);
40                    ~Transform();
41
42            enum orientation_flags {
43                ROT_0   = 0x00000000,
44                FLIP_H  = HAL_TRANSFORM_FLIP_H,
45                FLIP_V  = HAL_TRANSFORM_FLIP_V,
46                ROT_90  = HAL_TRANSFORM_ROT_90,
47                ROT_180 = FLIP_H|FLIP_V,
48                ROT_270 = ROT_180|ROT_90,
49                ROT_INVALID = 0x80
50            };
51
52            enum type_mask {
53                IDENTITY            = 0,
54                TRANSLATE           = 0x1,
55                ROTATE              = 0x2,
56                SCALE               = 0x4,
57                UNKNOWN             = 0x8
58            };
59
60            // query the transform
61            bool        transformed() const;
62            bool        preserveRects() const;
63            uint32_t    getType() const;
64            uint32_t    getOrientation() const;
65
66            float const* operator [] (int i) const;  // returns column i
67            int     tx() const;
68            int     ty() const;
69
70            // modify the transform
71            void        reset();
72            void        set(float tx, float ty);
73            void        set(float a, float b, float c, float d);
74            status_t    set(uint32_t flags, float w, float h);
75
76            // transform data
77            Rect    makeBounds(int w, int h) const;
78            void    transform(float* point, int x, int y) const;
79            Region  transform(const Region& reg) const;
80            Transform operator * (const Transform& rhs) const;
81
82            // for debugging
83            void dump(const char* name) const;
84
85private:
86    struct vec3 {
87        float v[3];
88        inline vec3() { }
89        inline vec3(float a, float b, float c) {
90            v[0] = a; v[1] = b; v[2] = c;
91        }
92        inline float operator [] (int i) const { return v[i]; }
93        inline float& operator [] (int i) { return v[i]; }
94    };
95    struct vec2 {
96        float v[2];
97        inline vec2() { }
98        inline vec2(float a, float b) {
99            v[0] = a; v[1] = b;
100        }
101        inline float operator [] (int i) const { return v[i]; }
102        inline float& operator [] (int i) { return v[i]; }
103    };
104    struct mat33 {
105        vec3 v[3];
106        inline const vec3& operator [] (int i) const { return v[i]; }
107        inline vec3& operator [] (int i) { return v[i]; }
108    };
109
110    enum { UNKNOWN_TYPE = 0x80000000 };
111
112    // assumes the last row is < 0 , 0 , 1 >
113    vec2 transform(const vec2& v) const;
114    vec3 transform(const vec3& v) const;
115    Rect transform(const Rect& bounds) const;
116    uint32_t type() const;
117    static bool absIsOne(float f);
118    static bool isZero(float f);
119
120    mat33               mMatrix;
121    mutable uint32_t    mType;
122};
123
124// ---------------------------------------------------------------------------
125}; // namespace android
126
127#endif /* ANDROID_TRANSFORM_H */
128