Rect.h revision a1d3c91afbd52c7e8b01f4a9060c5459f02ae7a5 
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 {
32public:
33    float left;
34    float top;
35    float right;
36    float bottom;
37
38    // Used by Region
39    typedef float value_type;
40
41    // we don't provide copy-ctor and operator= on purpose
42    // because we want the compiler generated versions
43
44    inline Rect():
45            left(0),
46            top(0),
47            right(0),
48            bottom(0) {
49    }
50
51    inline Rect(float left, float top, float right, float bottom):
52            left(left),
53            top(top),
54            right(right),
55            bottom(bottom) {
56    }
57
58    inline Rect(float width, float height):
59            left(0.0f),
60            top(0.0f),
61            right(width),
62            bottom(height) {
63    }
64
65    friend int operator==(const Rect& a, const Rect& b) {
66        return !memcmp(&a, &b, sizeof(a));
67    }
68
69    friend int operator!=(const Rect& a, const Rect& b) {
70        return memcmp(&a, &b, sizeof(a));
71    }
72
73    inline void clear() {
74        left = top = right = bottom = 0.0f;
75    }
76
77    inline bool isEmpty() const {
78        // this is written in such way this it'll handle NANs to return
79        // true (empty)
80        return !((left < right) && (top < bottom));
81    }
82
83    inline void setEmpty() {
84        left = top = right = bottom = 0.0f;
85    }
86
87    inline void set(float left, float top, float right, float bottom) {
88        this->left = left;
89        this->right = right;
90        this->top = top;
91        this->bottom = bottom;
92    }
93
94    inline void set(const Rect& r) {
95        set(r.left, r.top, r.right, r.bottom);
96    }
97
98    inline float getWidth() const {
99        return right - left;
100    }
101
102    inline float getHeight() const {
103        return bottom - top;
104    }
105
106    bool intersects(float l, float t, float r, float b) const {
107        return !intersectWith(l, t, r, b).isEmpty();
108    }
109
110    bool intersects(const Rect& r) const {
111        return intersects(r.left, r.top, r.right, r.bottom);
112    }
113
114    bool intersect(float l, float t, float r, float b) {
115        Rect tmp(intersectWith(l, t, r, b));
116        if (!tmp.isEmpty()) {
117            set(tmp);
118            return true;
119        }
120        return false;
121    }
122
123    bool intersect(const Rect& r) {
124        return intersect(r.left, r.top, r.right, r.bottom);
125    }
126
127    bool unionWith(const Rect& r) {
128        if (r.left < r.right && r.top < r.bottom) {
129            if (left < right && top < bottom) {
130                if (left > r.left) left = r.left;
131                if (top > r.top) top = r.top;
132                if (right < r.right) right = r.right;
133                if (bottom < r.bottom) bottom = r.bottom;
134                return true;
135            } else {
136                left = r.left;
137                top = r.top;
138                right = r.right;
139                bottom = r.bottom;
140                return true;
141            }
142        }
143        return false;
144    }
145
146    void translate(float dx, float dy) {
147        left += dx;
148        right += dx;
149        top += dy;
150        bottom += dy;
151    }
152
153    void snapToPixelBoundaries() {
154        left = floorf(left + 0.5f);
155        top = floorf(top + 0.5f);
156        right = floorf(right + 0.5f);
157        bottom = floorf(bottom + 0.5f);
158    }
159
160    void dump() const {
161        LOGD("Rect[l=%f t=%f r=%f b=%f]", left, top, right, bottom);
162    }
163
164private:
165    static inline float min(float a, float b) { return (a < b) ? a : b; }
166    static inline float max(float a, float b) { return (a > b) ? a : b; }
167
168    Rect intersectWith(float l, float t, float r, float b) const {
169        Rect tmp;
170        tmp.left = max(left, l);
171        tmp.top = max(top, t);
172        tmp.right = min(right, r);
173        tmp.bottom = min(bottom, b);
174        return tmp;
175    }
176
177}; // class Rect
178
179}; // namespace uirenderer
180}; // namespace android
181
182#endif // ANDROID_HWUI_RECT_H
183