1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mobile/android/base/gfx/TextLayer.java Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,69 @@
1.4 +/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +package org.mozilla.gecko.gfx;
1.10 +
1.11 +import org.mozilla.gecko.mozglue.DirectBufferAllocator;
1.12 +
1.13 +import android.graphics.Bitmap;
1.14 +import android.graphics.Canvas;
1.15 +import android.graphics.Color;
1.16 +import android.graphics.Paint;
1.17 +import android.graphics.Typeface;
1.18 +
1.19 +import java.nio.ByteBuffer;
1.20 +
1.21 +/**
1.22 + * Draws text on a layer. This is used for the frame rate meter.
1.23 + */
1.24 +public class TextLayer extends SingleTileLayer {
1.25 + private final ByteBuffer mBuffer; // this buffer is owned by the BufferedCairoImage
1.26 + private final IntSize mSize;
1.27 +
1.28 + /*
1.29 + * This awkward pattern is necessary due to Java's restrictions on when one can call superclass
1.30 + * constructors.
1.31 + */
1.32 + private TextLayer(ByteBuffer buffer, BufferedCairoImage image, IntSize size, String text) {
1.33 + super(false, image);
1.34 + mBuffer = buffer;
1.35 + mSize = size;
1.36 + renderText(text);
1.37 + }
1.38 +
1.39 + public static TextLayer create(IntSize size, String text) {
1.40 + ByteBuffer buffer = DirectBufferAllocator.allocate(size.width * size.height * 4);
1.41 + BufferedCairoImage image = new BufferedCairoImage(buffer, size.width, size.height,
1.42 + CairoImage.FORMAT_ARGB32);
1.43 + return new TextLayer(buffer, image, size, text);
1.44 + }
1.45 +
1.46 + public void setText(String text) {
1.47 + renderText(text);
1.48 + invalidate();
1.49 + }
1.50 +
1.51 + private void renderText(String text) {
1.52 + Bitmap bitmap = Bitmap.createBitmap(mSize.width, mSize.height, Bitmap.Config.ARGB_8888);
1.53 + Canvas canvas = new Canvas(bitmap);
1.54 +
1.55 + Paint textPaint = new Paint();
1.56 + textPaint.setAntiAlias(true);
1.57 + textPaint.setColor(Color.WHITE);
1.58 + textPaint.setFakeBoldText(true);
1.59 + textPaint.setTextSize(18.0f);
1.60 + textPaint.setTypeface(Typeface.DEFAULT_BOLD);
1.61 + float width = textPaint.measureText(text) + 18.0f;
1.62 +
1.63 + Paint backgroundPaint = new Paint();
1.64 + backgroundPaint.setColor(Color.argb(127, 0, 0, 0));
1.65 + canvas.drawRect(0.0f, 0.0f, width, 18.0f + 6.0f, backgroundPaint);
1.66 +
1.67 + canvas.drawText(text, 6.0f, 18.0f, textPaint);
1.68 +
1.69 + bitmap.copyPixelsToBuffer(mBuffer.asIntBuffer());
1.70 + }
1.71 +}
1.72 +
