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