1 /*
2  * Copyright (C) 2023 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 package com.android.wallpaper.picker.preview.ui.util
17 
18 import android.graphics.Point
19 import android.graphics.PointF
20 import android.graphics.Rect
21 import kotlin.math.abs
22 
23 /** Util for calculating cropping related size. */
24 object CropSizeUtil {
25 
26     /**
27      * Finds largest possible rectangle in [Rect] with the same aspect ratio in the target
28      * rectangle.
29      *
30      * See [findMaxRectWithRatioIn].
31      */
Rectnull32     fun Rect.findMaxRectWithRatioIn(rect: Rect): PointF =
33         Point(width(), height()).findMaxRectWithRatioIn(Point(rect.width(), rect.height()))
34 
35     /**
36      * Finds largest possible rectangle in [Point] with the same aspect ratio in the target
37      * rectangle.
38      *
39      * Calling rectangle will scale up or down to match the size of the target rectangle, the final
40      * rectangle size is the largest but not exceeding the size of target rectangle.
41      */
42     fun Point.findMaxRectWithRatioIn(point: Point): PointF {
43         val ratio =
44             if (x <= point.x && y <= point.y) {
45                 // Target rect is containing the calling rect
46                 if (abs(x - point.x) <= abs(y - point.y)) {
47                     point.x.toFloat() / x
48                 } else {
49                     point.y.toFloat() / y
50                 }
51             } else if (x > point.x && y > point.y) {
52                 // Calling rect is containing the target rect
53                 if (abs(x - point.x) >= abs(y - point.y)) {
54                     point.x.toFloat() / x
55                 } else {
56                     point.y.toFloat() / y
57                 }
58             } else {
59                 // Target rect and calling rect overlap
60                 if (x > point.x) {
61                     point.x.toFloat() / x
62                 } else {
63                     point.y.toFloat() / y
64                 }
65             }
66 
67         return PointF(x * ratio, y * ratio)
68     }
69 
fitCropRectToLayoutDirectionnull70     fun fitCropRectToLayoutDirection(
71         cropRect: Rect,
72         displaySize: Point,
73         isRtl: Boolean,
74     ): Rect {
75         val parallax = cropRect.width() - displaySize.x * cropRect.height() / displaySize.y
76         return Rect(cropRect).apply { if (isRtl) left += parallax else right -= parallax }
77     }
78 }
79