summaryrefslogtreecommitdiffstats
path: root/libs/ui/Rect.cpp
blob: b480f3a62bdfa737d0ec764733f3a4b94f02d42a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <system/graphics.h>
#include <ui/Rect.h>

namespace android {

static inline int32_t min(int32_t a, int32_t b) {
    return (a < b) ? a : b;
}

static inline int32_t max(int32_t a, int32_t b) {
    return (a > b) ? a : b;
}

void Rect::makeInvalid() {
    left = 0;
    top = 0;
    right = -1;
    bottom = -1;
}

bool Rect::operator <(const Rect& rhs) const {
    if (top < rhs.top) {
        return true;
    } else if (top == rhs.top) {
        if (left < rhs.left) {
            return true;
        } else if (left == rhs.left) {
            if (bottom < rhs.bottom) {
                return true;
            } else if (bottom == rhs.bottom) {
                if (right < rhs.right) {
                    return true;
                }
            }
        }
    }
    return false;
}

Rect& Rect::offsetTo(int32_t x, int32_t y) {
    right -= left - x;
    bottom -= top - y;
    left = x;
    top = y;
    return *this;
}

Rect& Rect::offsetBy(int32_t x, int32_t y) {
    left += x;
    top += y;
    right += x;
    bottom += y;
    return *this;
}

const Rect Rect::operator +(const Point& rhs) const {
    const Rect result(left + rhs.x, top + rhs.y, right + rhs.x, bottom + rhs.y);
    return result;
}

const Rect Rect::operator -(const Point& rhs) const {
    const Rect result(left - rhs.x, top - rhs.y, right - rhs.x, bottom - rhs.y);
    return result;
}

bool Rect::intersect(const Rect& with, Rect* result) const {
    result->left = max(left, with.left);
    result->top = max(top, with.top);
    result->right = min(right, with.right);
    result->bottom = min(bottom, with.bottom);
    return !(result->isEmpty());
}

Rect Rect::transform(uint32_t xform, int32_t width, int32_t height) const {
    Rect result(*this);
    if (xform & HAL_TRANSFORM_FLIP_H) {
        result = Rect(width - result.right, result.top, width - result.left,
                result.bottom);
    }
    if (xform & HAL_TRANSFORM_FLIP_V) {
        result = Rect(result.left, height - result.bottom, result.right,
                height - result.top);
    }
    if (xform & HAL_TRANSFORM_ROT_90) {
        int left = height - result.bottom;
        int top = result.left;
        int right = height - result.top;
        int bottom = result.right;
        result = Rect(left, top, right, bottom);
    }
    return result;
}

Rect Rect::reduce(const Rect& exclude) const {
    Rect result;

    uint32_t mask = 0;
    mask |= (exclude.left   > left)   ? 1 : 0;
    mask |= (exclude.top    > top)    ? 2 : 0;
    mask |= (exclude.right  < right)  ? 4 : 0;
    mask |= (exclude.bottom < bottom) ? 8 : 0;

    if (mask == 0) {
        // crop entirely covers us
        result.clear();
    } else {
        result = *this;
        if (!(mask & (mask - 1))) {
            // power-of-2, i.e.: just one bit is set
            if (mask & 1) {
                result.right = exclude.left;
            } else if (mask & 2) {
                result.bottom = exclude.top;
            } else if (mask & 4) {
                result.left = exclude.right;
            } else if (mask & 8) {
                result.top = exclude.bottom;
            }
        }
    }

    return result;
}

}; // namespace android