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