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