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