Rect.h revision 83b186a246e8ffd52b91a17c0019dd8c9c9d21b1 
1/*
2 * Copyright (C) 2010 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_HWUI_RECT_H
18#define ANDROID_HWUI_RECT_H
19
20#include <cmath>
21
22#include <utils/Log.h>
23
24namespace android {
25namespace uirenderer {
26
27///////////////////////////////////////////////////////////////////////////////
28// Structs
29///////////////////////////////////////////////////////////////////////////////
30
31class Rect {
32    static inline float min(float a, float b) { return (a<b) ? a : b; }
33    static inline float max(float a, float b) { return (a>b) ? a : b; }
34    Rect intersectWith(float l, float t, float r, float b) const {
35        Rect tmp;
36        tmp.left    = max(left, l);
37        tmp.top     = max(top, t);
38        tmp.right   = min(right, r);
39        tmp.bottom  = min(bottom, b);
40        return tmp;
41    }
42
43public:
44    float left;
45    float top;
46    float right;
47    float bottom;
48
49    // Used by Region
50    typedef float value_type;
51
52    // we don't provide copy-ctor and operator= on purpose
53    // because we want the compiler generated versions
54
55    inline Rect():
56            left(0),
57            top(0),
58            right(0),
59            bottom(0) {
60    }
61
62    inline Rect(float left, float top, float right, float bottom):
63            left(left),
64            top(top),
65            right(right),
66            bottom(bottom) {
67    }
68
69    inline Rect(float width, float height):
70            left(0.0f),
71            top(0.0f),
72            right(width),
73            bottom(height) {
74    }
75
76    friend int operator==(const Rect& a, const Rect& b) {
77        return !memcmp(&a, &b, sizeof(a));
78    }
79
80    friend int operator!=(const Rect& a, const Rect& b) {
81        return memcmp(&a, &b, sizeof(a));
82    }
83
84    inline void clear() {
85        left = top = right = bottom = 0.0f;
86    }
87
88    inline bool isEmpty() const {
89        // this is written in such way this it'll handle NANs to return
90        // true (empty)
91        return !((left < right) && (top < bottom));
92    }
93
94    inline void setEmpty() {
95        left = top = right = bottom = 0.0f;
96    }
97
98    inline void set(float left, float top, float right, float bottom) {
99        this->left = left;
100        this->right = right;
101        this->top = top;
102        this->bottom = bottom;
103    }
104
105    inline void set(const Rect& r) {
106        set(r.left, r.top, r.right, r.bottom);
107    }
108
109    inline float getWidth() const {
110        return right - left;
111    }
112
113    inline float getHeight() const {
114        return bottom - top;
115    }
116
117    bool intersects(float l, float t, float r, float b) const {
118        return !intersectWith(l,t,r,b).isEmpty();
119    }
120
121    bool intersects(const Rect& r) const {
122        return intersects(r.left, r.top, r.right, r.bottom);
123    }
124
125    bool intersect(float l, float t, float r, float b) {
126        Rect tmp(intersectWith(l,t,r,b));
127        if (!tmp.isEmpty()) {
128            set(tmp);
129            return true;
130        }
131        return false;
132    }
133
134    bool intersect(const Rect& r) {
135        return intersect(r.left, r.top, r.right, r.bottom);
136    }
137
138    bool unionWith(const Rect& r) {
139        if (r.left < r.right && r.top < r.bottom) {
140            if (left < right && top < bottom) {
141                if (left > r.left) left = r.left;
142                if (top > r.top) top = r.top;
143                if (right < r.right) right = r.right;
144                if (bottom < r.bottom) bottom = r.bottom;
145                return true;
146            } else {
147                left = r.left;
148                top = r.top;
149                right = r.right;
150                bottom = r.bottom;
151                return true;
152            }
153        }
154        return false;
155    }
156
157    void translate(float dx, float dy) {
158        left += dx;
159        right += dx;
160        top += dy;
161        bottom += dy;
162    }
163
164    void snapToPixelBoundaries() {
165        left = floorf(left + 0.5f);
166        top = floorf(top + 0.5f);
167        right = floorf(right + 0.5f);
168        bottom = floorf(bottom + 0.5f);
169    }
170
171    void dump() const {
172        LOGD("Rect[l=%f t=%f r=%f b=%f]", left, top, right, bottom);
173    }
174
175}; // class Rect
176
177}; // namespace uirenderer
178}; // namespace android
179
180#endif // ANDROID_HWUI_RECT_H
181