The Tor Browser: mobile/android/base/gfx/TileLayer.java@b8a032363ba2 (annotated)

mobile/android/base/gfx/TileLayer.java@b8a032363ba2 (annotated)

mobile/android/base/gfx/TileLayer.java

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

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

 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 package org.mozilla.gecko.gfx;
 import android.graphics.Rect;
 import android.opengl.GLES20;
 import android.util.Log;
 import java.nio.ByteBuffer;
 /**
  * Base class for tile layers, which encapsulate the logic needed to draw textured tiles in OpenGL
  * ES.
  */
 public abstract class TileLayer extends Layer {
     private static final String LOGTAG = "GeckoTileLayer";
     private final Rect mDirtyRect;
     private IntSize mSize;
     private int[] mTextureIDs;
     protected final CairoImage mImage;
     public enum PaintMode { NORMAL, REPEAT, STRETCH };
     private PaintMode mPaintMode;
     public TileLayer(CairoImage image, PaintMode paintMode) {
         super(image.getSize());
         mPaintMode = paintMode;
         mImage = image;
         mSize = new IntSize(0, 0);
         mDirtyRect = new Rect();
     }
     protected boolean repeats() { return mPaintMode == PaintMode.REPEAT; }
     protected boolean stretches() { return mPaintMode == PaintMode.STRETCH; }
     protected int getTextureID() { return mTextureIDs[0]; }
     protected boolean initialized() { return mImage != null && mTextureIDs != null; }
     @Override
     protected void finalize() throws Throwable {
         try {
             if (mTextureIDs != null)
                 TextureReaper.get().add(mTextureIDs);
         } finally {
             super.finalize();
         }
     }
     public void destroy() {
         try {
             if (mImage != null) {
                 mImage.destroy();
             }
         } catch (Exception ex) {
             Log.e(LOGTAG, "error clearing buffers: ", ex);
         }
     }
     public void setPaintMode(PaintMode mode) {
         mPaintMode = mode;
     }
     /**
      * Invalidates the entire buffer so that it will be uploaded again. Only valid inside a
      * transaction.
      */
     public void invalidate() {
         if (!inTransaction())
             throw new RuntimeException("invalidate() is only valid inside a transaction");
         IntSize bufferSize = mImage.getSize();
         mDirtyRect.set(0, 0, bufferSize.width, bufferSize.height);
     }
     private void validateTexture() {
         /* Calculate the ideal texture size. This must be a power of two if
          * the texture is repeated or OpenGL ES 2.0 isn't supported, as
          * OpenGL ES 2.0 is required for NPOT texture support (without
          * extensions), but doesn't support repeating NPOT textures.
          *
          * XXX Currently, we don't pick a GLES 2.0 context, so always round.
          */
         IntSize textureSize = mImage.getSize().nextPowerOfTwo();
         if (!textureSize.equals(mSize)) {
             mSize = textureSize;
             // Delete the old texture
             if (mTextureIDs != null) {
                 TextureReaper.get().add(mTextureIDs);
                 mTextureIDs = null;
                 // Free the texture immediately, so we don't incur a
                 // temporarily increased memory usage.
                 TextureReaper.get().reap();
             }
         }
     }
     @Override
     protected void performUpdates(RenderContext context) {
         super.performUpdates(context);
         // Reallocate the texture if the size has changed
         validateTexture();
         // Don't do any work if the image has an invalid size.
         if (!mImage.getSize().isPositive())
             return;
         // If we haven't allocated a texture, assume the whole region is dirty
         if (mTextureIDs == null) {
             uploadFullTexture();
         } else {
             uploadDirtyRect(mDirtyRect);
         }
         mDirtyRect.setEmpty();
     }
     private void uploadFullTexture() {
         IntSize bufferSize = mImage.getSize();
         uploadDirtyRect(new Rect(0, 0, bufferSize.width, bufferSize.height));
     }
     private void uploadDirtyRect(Rect dirtyRect) {
         // If we have nothing to upload, just return for now
         if (dirtyRect.isEmpty())
             return;
         // It's possible that the buffer will be null, check for that and return
         ByteBuffer imageBuffer = mImage.getBuffer();
         if (imageBuffer == null)
             return;
         if (mTextureIDs == null) {
             mTextureIDs = new int[1];
             GLES20.glGenTextures(mTextureIDs.length, mTextureIDs, 0);
         }
         int cairoFormat = mImage.getFormat();
         CairoGLInfo glInfo = new CairoGLInfo(cairoFormat);
         bindAndSetGLParameters();
         // XXX TexSubImage2D is too broken to rely on on Adreno, and very slow
         //     on other chipsets, so we always upload the entire buffer.
         IntSize bufferSize = mImage.getSize();
         if (mSize.equals(bufferSize)) {
             GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, glInfo.internalFormat, mSize.width,
                                 mSize.height, 0, glInfo.format, glInfo.type, imageBuffer);
         } else {
             // Our texture has been expanded to the next power of two.
             // XXX We probably never want to take this path, so throw an exception.
             throw new RuntimeException("Buffer/image size mismatch in TileLayer!");
         }
     }
     private void bindAndSetGLParameters() {
         GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
         GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureIDs[0]);
         GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER,
                                GLES20.GL_LINEAR);
         GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER,
                                GLES20.GL_LINEAR);
         int repeatMode = repeats() ? GLES20.GL_REPEAT : GLES20.GL_CLAMP_TO_EDGE;
         GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, repeatMode);
         GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, repeatMode);
     }
 }

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mobile/android/base/gfx/TileLayer.java@b8a032363ba2 (annotated)

mobile/android/base/gfx/TileLayer.java