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74 lines
2.6 KiB
Java
74 lines
2.6 KiB
Java
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.gecko.gfx;
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import org.mozilla.gecko.GeckoAppShell;
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import org.mozilla.gecko.gfx.BufferedCairoImage;
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import org.mozilla.gecko.gfx.CairoImage;
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import org.mozilla.gecko.gfx.IntSize;
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import org.mozilla.gecko.gfx.SingleTileLayer;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.Typeface;
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import android.util.Log;
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import java.nio.ByteBuffer;
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import java.nio.IntBuffer;
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/**
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* Draws text on a layer. This is used for the frame rate meter.
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*/
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public class TextLayer extends SingleTileLayer {
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private final ByteBuffer mBuffer; // this buffer is owned by the BufferedCairoImage
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private final IntSize mSize;
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/*
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* This awkward pattern is necessary due to Java's restrictions on when one can call superclass
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* constructors.
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*/
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private TextLayer(ByteBuffer buffer, BufferedCairoImage image, IntSize size, String text) {
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super(false, image);
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mBuffer = buffer;
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mSize = size;
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renderText(text);
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}
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public static TextLayer create(IntSize size, String text) {
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ByteBuffer buffer = GeckoAppShell.allocateDirectBuffer(size.width * size.height * 4);
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BufferedCairoImage image = new BufferedCairoImage(buffer, size.width, size.height,
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CairoImage.FORMAT_ARGB32);
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return new TextLayer(buffer, image, size, text);
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}
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public void setText(String text) {
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renderText(text);
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invalidate();
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}
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private void renderText(String text) {
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Bitmap bitmap = Bitmap.createBitmap(mSize.width, mSize.height, Bitmap.Config.ARGB_8888);
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Canvas canvas = new Canvas(bitmap);
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Paint textPaint = new Paint();
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textPaint.setAntiAlias(true);
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textPaint.setColor(Color.WHITE);
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textPaint.setFakeBoldText(true);
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textPaint.setTextSize(18.0f);
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textPaint.setTypeface(Typeface.DEFAULT_BOLD);
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float width = textPaint.measureText(text) + 18.0f;
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Paint backgroundPaint = new Paint();
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backgroundPaint.setColor(Color.argb(127, 0, 0, 0));
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canvas.drawRect(0.0f, 0.0f, width, 18.0f + 6.0f, backgroundPaint);
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canvas.drawText(text, 6.0f, 18.0f, textPaint);
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bitmap.copyPixelsToBuffer(mBuffer.asIntBuffer());
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}
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}
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