The Tor Browser: mobile/android/base/gfx/TextureGenerator.java@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     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 android.opengl.GLES20;

     9 import android.util.Log;

    11 import java.util.concurrent.ArrayBlockingQueue;

    13 import javax.microedition.khronos.egl.EGL10;

    14 import javax.microedition.khronos.egl.EGLContext;

    16 public class TextureGenerator {

    17     private static final String LOGTAG = "TextureGenerator";

    18     private static final int POOL_SIZE = 5;

    20     private static TextureGenerator sSharedInstance;

    22     private ArrayBlockingQueue<Integer> mTextureIds;

    23     private EGLContext mContext;

    25     private TextureGenerator() { mTextureIds = new ArrayBlockingQueue<Integer>(POOL_SIZE); }

    27     public static TextureGenerator get() {

    28         if (sSharedInstance == null)

    29             sSharedInstance = new TextureGenerator();

    30         return sSharedInstance;

    31     }

    33     public synchronized int take() {

    34         try {

    35             // Will block until one becomes available

    36             return (int)mTextureIds.take();

    37         } catch (InterruptedException e) {

    38             return 0;

    39         }

    40     }

    42     public synchronized void fill() {

    43         EGL10 egl = (EGL10)EGLContext.getEGL();

    44         EGLContext context = egl.eglGetCurrentContext();

    46         if (mContext != null && mContext != context) {

    47             mTextureIds.clear();

    48         }

    50         mContext = context;

    52         int numNeeded = mTextureIds.remainingCapacity();

    53         if (numNeeded == 0)

    54             return;

    56         // Clear existing GL errors

    57         int error;

    58         while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {

    59             Log.w(LOGTAG, String.format("Clearing GL error: %#x", error));

    60         }

    62         int[] textures = new int[numNeeded];

    63         GLES20.glGenTextures(numNeeded, textures, 0);

    65         error = GLES20.glGetError();

    66         if (error != GLES20.GL_NO_ERROR) {

    67             Log.e(LOGTAG, String.format("Failed to generate textures: %#x", error), new Exception());

    68             return;

    69         }

    71         for (int i = 0; i < numNeeded; i++) {

    72             mTextureIds.offer(textures[i]);

    73         }

    74     }

    75 }

The Tor Browser / file revision