gecko/embedding/android/gfx/TextLayer.java

100 lines
3.7 KiB
Java

/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Android code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2009-2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Patrick Walton <pcwalton@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
package org.mozilla.gecko.gfx;
import org.mozilla.gecko.gfx.BufferedCairoImage;
import org.mozilla.gecko.gfx.CairoImage;
import org.mozilla.gecko.gfx.IntSize;
import org.mozilla.gecko.gfx.SingleTileLayer;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.util.Log;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
/**
* Draws text on a layer. This is used for the frame rate meter.
*/
public class TextLayer extends SingleTileLayer {
private ByteBuffer mBuffer;
private BufferedCairoImage mImage;
private IntSize mSize;
private String mText;
public TextLayer(IntSize size) {
super(false);
mBuffer = ByteBuffer.allocateDirect(size.width * size.height * 4);
mSize = size;
mImage = new BufferedCairoImage(mBuffer, size.width, size.height,
CairoImage.FORMAT_ARGB32);
mText = "";
}
public void setText(String text) {
mText = text;
renderText();
paintImage(mImage);
}
private void renderText() {
Bitmap bitmap = Bitmap.createBitmap(mSize.width, mSize.height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
Paint textPaint = new Paint();
textPaint.setAntiAlias(true);
textPaint.setColor(Color.WHITE);
textPaint.setFakeBoldText(true);
textPaint.setTextSize(18.0f);
textPaint.setTypeface(Typeface.DEFAULT_BOLD);
float width = textPaint.measureText(mText) + 18.0f;
Paint backgroundPaint = new Paint();
backgroundPaint.setColor(Color.argb(127, 0, 0, 0));
canvas.drawRect(0.0f, 0.0f, width, 18.0f + 6.0f, backgroundPaint);
canvas.drawText(mText, 6.0f, 18.0f, textPaint);
bitmap.copyPixelsToBuffer(mBuffer.asIntBuffer());
}
}