1 /* 2 * Copyright (C) 2011 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 import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM; 20 21 import android.graphics.Canvas; 22 import android.graphics.Paint; 23 import android.graphics.PixelFormat; 24 import android.graphics.PorterDuff; 25 import android.graphics.Rect; 26 import android.graphics.Typeface; 27 import android.graphics.Paint.FontMetricsInt; 28 import android.util.DisplayMetrics; 29 import android.util.Log; 30 import android.util.TypedValue; 31 import android.view.Display; 32 import android.view.Surface.OutOfResourcesException; 33 import android.view.Surface; 34 import android.view.SurfaceControl; 35 import android.view.SurfaceSession; 36 37 /** 38 * Displays a watermark on top of the window manager's windows. 39 */ 40 class Watermark { 41 private final Display mDisplay; 42 private final String[] mTokens; 43 private final String mText; 44 private final Paint mTextPaint; 45 private final int mTextWidth; 46 private final int mTextHeight; 47 private final int mDeltaX; 48 private final int mDeltaY; 49 50 private final SurfaceControl mSurfaceControl; 51 private final Surface mSurface = new Surface(); 52 private int mLastDW; 53 private int mLastDH; 54 private boolean mDrawNeeded; 55 56 Watermark(DisplayContent dc, DisplayMetrics dm, String[] tokens) { 57 if (false) { 58 Log.i(TAG_WM, "*********************** WATERMARK"); 59 for (int i=0; i<tokens.length; i++) { 60 Log.i(TAG_WM, " TOKEN #" + i + ": " + tokens[i]); 61 } 62 } 63 64 mDisplay = dc.getDisplay(); 65 mTokens = tokens; 66 67 StringBuilder builder = new StringBuilder(32); 68 int len = mTokens[0].length(); 69 len = len & ~1; 70 for (int i=0; i<len; i+=2) { 71 int c1 = mTokens[0].charAt(i); 72 int c2 = mTokens[0].charAt(i+1); 73 if (c1 >= 'a' && c1 <= 'f') c1 = c1 - 'a' + 10; 74 else if (c1 >= 'A' && c1 <= 'F') c1 = c1 - 'A' + 10; 75 else c1 -= '0'; 76 if (c2 >= 'a' && c2 <= 'f') c2 = c2 - 'a' + 10; 77 else if (c2 >= 'A' && c2 <= 'F') c2 = c2 - 'A' + 10; 78 else c2 -= '0'; 79 builder.append((char)(255-((c1*16)+c2))); 80 } 81 mText = builder.toString(); 82 if (false) { 83 Log.i(TAG_WM, "Final text: " + mText); 84 } 85 86 int fontSize = WindowManagerService.getPropertyInt(tokens, 1, 87 TypedValue.COMPLEX_UNIT_DIP, 20, dm); 88 89 mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG); 90 mTextPaint.setTextSize(fontSize); 91 mTextPaint.setTypeface(Typeface.create(Typeface.SANS_SERIF, Typeface.BOLD)); 92 93 FontMetricsInt fm = mTextPaint.getFontMetricsInt(); 94 mTextWidth = (int)mTextPaint.measureText(mText); 95 mTextHeight = fm.descent - fm.ascent; 96 97 mDeltaX = WindowManagerService.getPropertyInt(tokens, 2, 98 TypedValue.COMPLEX_UNIT_PX, mTextWidth*2, dm); 99 mDeltaY = WindowManagerService.getPropertyInt(tokens, 3, 100 TypedValue.COMPLEX_UNIT_PX, mTextHeight*3, dm); 101 int shadowColor = WindowManagerService.getPropertyInt(tokens, 4, 102 TypedValue.COMPLEX_UNIT_PX, 0xb0000000, dm); 103 int color = WindowManagerService.getPropertyInt(tokens, 5, 104 TypedValue.COMPLEX_UNIT_PX, 0x60ffffff, dm); 105 int shadowRadius = WindowManagerService.getPropertyInt(tokens, 6, 106 TypedValue.COMPLEX_UNIT_PX, 7, dm); 107 int shadowDx = WindowManagerService.getPropertyInt(tokens, 8, 108 TypedValue.COMPLEX_UNIT_PX, 0, dm); 109 int shadowDy = WindowManagerService.getPropertyInt(tokens, 9, 110 TypedValue.COMPLEX_UNIT_PX, 0, dm); 111 112 mTextPaint.setColor(color); 113 mTextPaint.setShadowLayer(shadowRadius, shadowDx, shadowDy, shadowColor); 114 115 SurfaceControl ctrl = null; 116 try { 117 ctrl = dc.makeOverlay() 118 .setName("WatermarkSurface") 119 .setSize(1, 1) 120 .setFormat(PixelFormat.TRANSLUCENT) 121 .build(); 122 ctrl.setLayerStack(mDisplay.getLayerStack()); 123 ctrl.setLayer(WindowManagerService.TYPE_LAYER_MULTIPLIER*100); 124 ctrl.setPosition(0, 0); 125 ctrl.show(); 126 mSurface.copyFrom(ctrl); 127 } catch (OutOfResourcesException e) { 128 } 129 mSurfaceControl = ctrl; 130 } 131 132 void positionSurface(int dw, int dh) { 133 if (mLastDW != dw || mLastDH != dh) { 134 mLastDW = dw; 135 mLastDH = dh; 136 mSurfaceControl.setSize(dw, dh); 137 mDrawNeeded = true; 138 } 139 } 140 141 void drawIfNeeded() { 142 if (mDrawNeeded) { 143 final int dw = mLastDW; 144 final int dh = mLastDH; 145 146 mDrawNeeded = false; 147 Rect dirty = new Rect(0, 0, dw, dh); 148 Canvas c = null; 149 try { 150 c = mSurface.lockCanvas(dirty); 151 } catch (IllegalArgumentException e) { 152 } catch (Surface.OutOfResourcesException e) { 153 } 154 if (c != null) { 155 c.drawColor(0, PorterDuff.Mode.CLEAR); 156 157 int deltaX = mDeltaX; 158 int deltaY = mDeltaY; 159 160 // deltaX shouldn't be close to a round fraction of our 161 // x step, or else things will line up too much. 162 int div = (dw+mTextWidth)/deltaX; 163 int rem = (dw+mTextWidth) - (div*deltaX); 164 int qdelta = deltaX/4; 165 if (rem < qdelta || rem > (deltaX-qdelta)) { 166 deltaX += deltaX/3; 167 } 168 169 int y = -mTextHeight; 170 int x = -mTextWidth; 171 while (y < (dh+mTextHeight)) { 172 c.drawText(mText, x, y, mTextPaint); 173 x += deltaX; 174 if (x >= dw) { 175 x -= (dw+mTextWidth); 176 y += deltaY; 177 } 178 } 179 mSurface.unlockCanvasAndPost(c); 180 } 181 } 182 } 183 } 184
