The Tor Browser: mobile/android/base/gfx/TextLayer.java@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-

     2  * This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 package org.mozilla.gecko.gfx;

     8 import org.mozilla.gecko.mozglue.DirectBufferAllocator;

    10 import android.graphics.Bitmap;

    11 import android.graphics.Canvas;

    12 import android.graphics.Color;

    13 import android.graphics.Paint;

    14 import android.graphics.Typeface;

    16 import java.nio.ByteBuffer;

    18 /**

    19  * Draws text on a layer. This is used for the frame rate meter.

    20  */

    21 public class TextLayer extends SingleTileLayer {

    22     private final ByteBuffer mBuffer;   // this buffer is owned by the BufferedCairoImage

    23     private final IntSize mSize;

    25     /*

    26      * This awkward pattern is necessary due to Java's restrictions on when one can call superclass

    27      * constructors.

    28      */

    29     private TextLayer(ByteBuffer buffer, BufferedCairoImage image, IntSize size, String text) {

    30         super(false, image);

    31         mBuffer = buffer;

    32         mSize = size;

    33         renderText(text);

    34     }

    36     public static TextLayer create(IntSize size, String text) {

    37         ByteBuffer buffer = DirectBufferAllocator.allocate(size.width * size.height * 4);

    38         BufferedCairoImage image = new BufferedCairoImage(buffer, size.width, size.height,

    39                                                           CairoImage.FORMAT_ARGB32);

    40         return new TextLayer(buffer, image, size, text);

    41     }

    43     public void setText(String text) {

    44         renderText(text);

    45         invalidate();

    46     }

    48     private void renderText(String text) {

    49         Bitmap bitmap = Bitmap.createBitmap(mSize.width, mSize.height, Bitmap.Config.ARGB_8888);

    50         Canvas canvas = new Canvas(bitmap);

    52         Paint textPaint = new Paint();

    53         textPaint.setAntiAlias(true);

    54         textPaint.setColor(Color.WHITE);

    55         textPaint.setFakeBoldText(true);

    56         textPaint.setTextSize(18.0f);

    57         textPaint.setTypeface(Typeface.DEFAULT_BOLD);

    58         float width = textPaint.measureText(text) + 18.0f;

    60         Paint backgroundPaint = new Paint();

    61         backgroundPaint.setColor(Color.argb(127, 0, 0, 0));

    62         canvas.drawRect(0.0f, 0.0f, width, 18.0f + 6.0f, backgroundPaint);

    64         canvas.drawText(text, 6.0f, 18.0f, textPaint);

    66         bitmap.copyPixelsToBuffer(mBuffer.asIntBuffer());

    67     }

    68 }

The Tor Browser / file revision