| /* |
| * Copyright (C) 2018 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 |
| */ |
| |
| package com.android.server.wm.utils; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.graphics.Rect; |
| import android.view.Surface; |
| |
| |
| /** |
| * Utility methods to handle insets represented as rects. |
| */ |
| public class InsetUtils { |
| |
| private InsetUtils() { |
| } |
| |
| /** |
| * Transforms insets given in one rotation into insets in a different rotation. |
| * |
| * @param inOutInsets the insets to transform, is set to the transformed insets |
| * @param rotationDelta the delta between the new and old rotation. |
| * Must be one of Surface.ROTATION_0/90/180/270. |
| */ |
| public static void rotateInsets(Rect inOutInsets, int rotationDelta) { |
| final Rect r = inOutInsets; |
| switch (rotationDelta) { |
| case Surface.ROTATION_0: |
| return; |
| case Surface.ROTATION_90: |
| r.set(r.top, r.right, r.bottom, r.left); |
| break; |
| case Surface.ROTATION_180: |
| r.set(r.right, r.bottom, r.left, r.top); |
| break; |
| case Surface.ROTATION_270: |
| r.set(r.bottom, r.left, r.top, r.right); |
| break; |
| default: |
| throw new IllegalArgumentException("Unknown rotation: " + rotationDelta); |
| } |
| } |
| |
| /** |
| * Adds {@code insetsToAdd} to {@code inOutInsets}. |
| */ |
| public static void addInsets(Rect inOutInsets, Rect insetsToAdd) { |
| inOutInsets.left += insetsToAdd.left; |
| inOutInsets.top += insetsToAdd.top; |
| inOutInsets.right += insetsToAdd.right; |
| inOutInsets.bottom += insetsToAdd.bottom; |
| } |
| |
| /** |
| * Calculates the insets from the {@code outerFrame} to the {@code innerFrame}. |
| * |
| * Note that if a side of the outer frame is not actually on the outside, the inset for that |
| * side will be clamped to zero. |
| * |
| * @param outerFrame the reference frame from which the insets are calculated |
| * @param innerFrame the inset frame, to which the insets are calculated, |
| * or null to clear the insets. |
| * @param outInsets is set to the result of the inset calculation. |
| */ |
| public static void insetsBetweenFrames(@NonNull Rect outerFrame, @Nullable Rect innerFrame, |
| @NonNull Rect outInsets) { |
| if (innerFrame == null) { |
| outInsets.setEmpty(); |
| return; |
| } |
| final int w = outerFrame.width(); |
| final int h = outerFrame.height(); |
| outInsets.set( |
| Math.min(w, Math.max(0, innerFrame.left - outerFrame.left)), |
| Math.min(h, Math.max(0, innerFrame.top - outerFrame.top)), |
| Math.min(w, Math.max(0, outerFrame.right - innerFrame.right)), |
| Math.min(h, Math.max(0, outerFrame.bottom - innerFrame.bottom))); |
| } |
| } |