/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server.wm;
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import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.graphics.Paint.FontMetricsInt;
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import android.graphics.PixelFormat;
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import android.graphics.PorterDuff;
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import android.graphics.Rect;
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import android.graphics.Typeface;
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import android.util.DisplayMetrics;
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import android.util.Log;
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import android.util.TypedValue;
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import android.view.Display;
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import android.view.Surface;
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import android.view.Surface.OutOfResourcesException;
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import android.view.SurfaceControl;
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/**
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* Displays a watermark on top of the window manager's windows.
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*/
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class Watermark {
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private final Display mDisplay;
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private final String[] mTokens;
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private final String mText;
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private final Paint mTextPaint;
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private final int mTextWidth;
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private final int mTextHeight;
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private final int mDeltaX;
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private final int mDeltaY;
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private final SurfaceControl mSurfaceControl;
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private final Surface mSurface = new Surface();
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private int mLastDW;
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private int mLastDH;
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private boolean mDrawNeeded;
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Watermark(DisplayContent dc, DisplayMetrics dm, String[] tokens) {
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if (false) {
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Log.i(TAG_WM, "*********************** WATERMARK");
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for (int i=0; i<tokens.length; i++) {
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Log.i(TAG_WM, " TOKEN #" + i + ": " + tokens[i]);
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}
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}
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mDisplay = dc.getDisplay();
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mTokens = tokens;
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StringBuilder builder = new StringBuilder(32);
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int len = mTokens[0].length();
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len = len & ~1;
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for (int i=0; i<len; i+=2) {
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int c1 = mTokens[0].charAt(i);
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int c2 = mTokens[0].charAt(i+1);
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if (c1 >= 'a' && c1 <= 'f') c1 = c1 - 'a' + 10;
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else if (c1 >= 'A' && c1 <= 'F') c1 = c1 - 'A' + 10;
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else c1 -= '0';
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if (c2 >= 'a' && c2 <= 'f') c2 = c2 - 'a' + 10;
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else if (c2 >= 'A' && c2 <= 'F') c2 = c2 - 'A' + 10;
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else c2 -= '0';
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builder.append((char)(255-((c1*16)+c2)));
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}
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mText = builder.toString();
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if (false) {
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Log.i(TAG_WM, "Final text: " + mText);
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}
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int fontSize = WindowManagerService.getPropertyInt(tokens, 1,
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TypedValue.COMPLEX_UNIT_DIP, 20, dm);
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mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
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mTextPaint.setTextSize(fontSize);
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mTextPaint.setTypeface(Typeface.create(Typeface.SANS_SERIF, Typeface.BOLD));
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FontMetricsInt fm = mTextPaint.getFontMetricsInt();
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mTextWidth = (int)mTextPaint.measureText(mText);
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mTextHeight = fm.descent - fm.ascent;
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mDeltaX = WindowManagerService.getPropertyInt(tokens, 2,
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TypedValue.COMPLEX_UNIT_PX, mTextWidth*2, dm);
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mDeltaY = WindowManagerService.getPropertyInt(tokens, 3,
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TypedValue.COMPLEX_UNIT_PX, mTextHeight*3, dm);
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int shadowColor = WindowManagerService.getPropertyInt(tokens, 4,
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TypedValue.COMPLEX_UNIT_PX, 0xb0000000, dm);
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int color = WindowManagerService.getPropertyInt(tokens, 5,
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TypedValue.COMPLEX_UNIT_PX, 0x60ffffff, dm);
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int shadowRadius = WindowManagerService.getPropertyInt(tokens, 6,
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TypedValue.COMPLEX_UNIT_PX, 7, dm);
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int shadowDx = WindowManagerService.getPropertyInt(tokens, 8,
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TypedValue.COMPLEX_UNIT_PX, 0, dm);
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int shadowDy = WindowManagerService.getPropertyInt(tokens, 9,
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TypedValue.COMPLEX_UNIT_PX, 0, dm);
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mTextPaint.setColor(color);
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mTextPaint.setShadowLayer(shadowRadius, shadowDx, shadowDy, shadowColor);
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SurfaceControl ctrl = null;
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try {
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ctrl = dc.makeOverlay()
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.setName("WatermarkSurface")
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.setBufferSize(1, 1)
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.setFormat(PixelFormat.TRANSLUCENT)
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.build();
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ctrl.setLayerStack(mDisplay.getLayerStack());
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ctrl.setLayer(WindowManagerService.TYPE_LAYER_MULTIPLIER*100);
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ctrl.setPosition(0, 0);
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ctrl.show();
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mSurface.copyFrom(ctrl);
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} catch (OutOfResourcesException e) {
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}
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mSurfaceControl = ctrl;
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}
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void positionSurface(int dw, int dh) {
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if (mLastDW != dw || mLastDH != dh) {
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mLastDW = dw;
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mLastDH = dh;
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mSurfaceControl.setBufferSize(dw, dh);
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mDrawNeeded = true;
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}
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}
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void drawIfNeeded() {
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if (mDrawNeeded) {
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final int dw = mLastDW;
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final int dh = mLastDH;
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mDrawNeeded = false;
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Rect dirty = new Rect(0, 0, dw, dh);
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Canvas c = null;
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try {
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c = mSurface.lockCanvas(dirty);
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} catch (IllegalArgumentException e) {
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} catch (Surface.OutOfResourcesException e) {
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}
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if (c != null) {
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c.drawColor(0, PorterDuff.Mode.CLEAR);
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int deltaX = mDeltaX;
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int deltaY = mDeltaY;
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// deltaX shouldn't be close to a round fraction of our
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// x step, or else things will line up too much.
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int div = (dw+mTextWidth)/deltaX;
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int rem = (dw+mTextWidth) - (div*deltaX);
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int qdelta = deltaX/4;
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if (rem < qdelta || rem > (deltaX-qdelta)) {
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deltaX += deltaX/3;
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}
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int y = -mTextHeight;
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int x = -mTextWidth;
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while (y < (dh+mTextHeight)) {
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c.drawText(mText, x, y, mTextPaint);
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x += deltaX;
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if (x >= dw) {
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x -= (dw+mTextWidth);
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y += deltaY;
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}
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}
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mSurface.unlockCanvasAndPost(c);
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}
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}
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}
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}
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