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 
17 package com.google.android.wallpaper.weathereffects.graphics.utils
18 
19 import android.graphics.Matrix
20 import android.util.SizeF
21 
22 /** Helper functions for matrix operations. */
23 object MatrixUtils {
24     /** Returns a [Matrix] that crops the image and centers to the screen. */
centerCropMatrixnull25     fun centerCropMatrix(surfaceSize: SizeF, imageSize: SizeF): Matrix {
26         val widthScale = surfaceSize.width / imageSize.width
27         val heightScale = surfaceSize.height / imageSize.height
28         val scale = maxOf(widthScale, heightScale)
29 
30         return Matrix(Matrix.IDENTITY_MATRIX).apply {
31             // Move the origin of the image to its center.
32             postTranslate(-imageSize.width / 2f, -imageSize.height / 2f)
33             // Apply scale.
34             postScale(scale, scale)
35             // Translate back to the center of the screen.
36             postTranslate(surfaceSize.width / 2f, surfaceSize.height / 2f)
37         }
38     }
39 }
40