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 package com.android.server.wm; 18 19 20 import android.graphics.Canvas; 21 import android.graphics.Color; 22 import android.graphics.PixelFormat; 23 import android.graphics.Rect; 24 import android.graphics.Region; 25 import android.view.Display; 26 import android.view.Surface.OutOfResourcesException; 27 import android.view.Surface; 28 import android.view.SurfaceControl; 29 import android.view.SurfaceSession; 30 31 class StrictModeFlash { 32 private static final String TAG = "StrictModeFlash"; 33 34 private final SurfaceControl mSurfaceControl; 35 private final Surface mSurface = new Surface(); 36 private int mLastDW; 37 private int mLastDH; 38 private boolean mDrawNeeded; 39 private final int mThickness = 20; 40 StrictModeFlash(Display display, SurfaceSession session)41 public StrictModeFlash(Display display, SurfaceSession session) { 42 SurfaceControl ctrl = null; 43 try { 44 ctrl = new SurfaceControl(session, "StrictModeFlash", 45 1, 1, PixelFormat.TRANSLUCENT, SurfaceControl.HIDDEN); 46 ctrl.setLayerStack(display.getLayerStack()); 47 ctrl.setLayer(WindowManagerService.TYPE_LAYER_MULTIPLIER * 101); // one more than Watermark? arbitrary. 48 ctrl.setPosition(0, 0); 49 ctrl.show(); 50 mSurface.copyFrom(ctrl); 51 } catch (OutOfResourcesException e) { 52 } 53 mSurfaceControl = ctrl; 54 mDrawNeeded = true; 55 } 56 drawIfNeeded()57 private void drawIfNeeded() { 58 if (!mDrawNeeded) { 59 return; 60 } 61 mDrawNeeded = false; 62 final int dw = mLastDW; 63 final int dh = mLastDH; 64 65 Rect dirty = new Rect(0, 0, dw, dh); 66 Canvas c = null; 67 try { 68 c = mSurface.lockCanvas(dirty); 69 } catch (IllegalArgumentException e) { 70 } catch (Surface.OutOfResourcesException e) { 71 } 72 if (c == null) { 73 return; 74 } 75 76 // Top 77 c.clipRect(new Rect(0, 0, dw, mThickness), Region.Op.REPLACE); 78 c.drawColor(Color.RED); 79 // Left 80 c.clipRect(new Rect(0, 0, mThickness, dh), Region.Op.REPLACE); 81 c.drawColor(Color.RED); 82 // Right 83 c.clipRect(new Rect(dw - mThickness, 0, dw, dh), Region.Op.REPLACE); 84 c.drawColor(Color.RED); 85 // Bottom 86 c.clipRect(new Rect(0, dh - mThickness, dw, dh), Region.Op.REPLACE); 87 c.drawColor(Color.RED); 88 89 mSurface.unlockCanvasAndPost(c); 90 } 91 92 // Note: caller responsible for being inside 93 // Surface.openTransaction() / closeTransaction() setVisibility(boolean on)94 public void setVisibility(boolean on) { 95 if (mSurfaceControl == null) { 96 return; 97 } 98 drawIfNeeded(); 99 if (on) { 100 mSurfaceControl.show(); 101 } else { 102 mSurfaceControl.hide(); 103 } 104 } 105 positionSurface(int dw, int dh)106 void positionSurface(int dw, int dh) { 107 if (mLastDW == dw && mLastDH == dh) { 108 return; 109 } 110 mLastDW = dw; 111 mLastDH = dh; 112 mSurfaceControl.setSize(dw, dh); 113 mDrawNeeded = true; 114 } 115 116 } 117