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0bb534ddd1
Instead of tying the tile-buffer in MultiTileLayer directly to the back-buffer of the page, make sure rendering is always aligned to the tile grid and use tiles on-demand. This makes better use of tiles when panning/zooming, and opens up the route for further optimisations.
250 lines
9.1 KiB
Java
250 lines
9.1 KiB
Java
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Android code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2009-2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Patrick Walton <pcwalton@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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package org.mozilla.gecko.gfx;
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import android.graphics.Rect;
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import android.graphics.RectF;
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import android.opengl.GLES20;
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import android.util.Log;
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import javax.microedition.khronos.opengles.GL10;
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import javax.microedition.khronos.opengles.GL11Ext;
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import java.nio.Buffer;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.nio.FloatBuffer;
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/**
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* Base class for tile layers, which encapsulate the logic needed to draw textured tiles in OpenGL
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* ES.
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*/
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public abstract class TileLayer extends Layer {
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private static final String LOGTAG = "GeckoTileLayer";
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private final Rect mDirtyRect;
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private final CairoImage mImage;
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private final boolean mRepeat;
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private IntSize mSize;
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private Rect mValidTextureRect;
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private int[] mTextureIDs;
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public TileLayer(boolean repeat, CairoImage image) {
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mRepeat = repeat;
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mImage = image;
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mSize = new IntSize(0, 0);
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mValidTextureRect = new Rect();
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IntSize bufferSize = mImage.getSize();
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mDirtyRect = new Rect();
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}
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@Override
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public IntSize getSize() { return mImage.getSize(); }
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protected boolean repeats() { return mRepeat; }
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protected int getTextureID() { return mTextureIDs[0]; }
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protected boolean initialized() { return mImage != null && mTextureIDs != null; }
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@Override
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protected void finalize() throws Throwable {
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if (mTextureIDs != null)
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TextureReaper.get().add(mTextureIDs);
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}
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/**
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* Invalidates the given rect so that it will be uploaded again. Only valid inside a
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* transaction.
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*/
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public void invalidate(Rect rect) {
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if (!inTransaction())
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throw new RuntimeException("invalidate() is only valid inside a transaction");
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mDirtyRect.union(rect);
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}
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public void invalidate() {
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IntSize bufferSize = mImage.getSize();
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invalidate(new Rect(0, 0, bufferSize.width, bufferSize.height));
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}
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public boolean isDirty() {
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return mImage.getSize().isPositive() && (mTextureIDs == null || !mDirtyRect.isEmpty());
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}
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private void validateTexture(GL10 gl) {
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/* Calculate the ideal texture size. This must be a power of two if
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* the texture is repeated or OpenGL ES 2.0 isn't supported, as
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* OpenGL ES 2.0 is required for NPOT texture support (without
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* extensions), but doesn't support repeating NPOT textures.
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*
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* XXX Currently, we don't pick a GLES 2.0 context, so always round.
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*/
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IntSize bufferSize = mImage.getSize();
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IntSize textureSize = bufferSize;
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textureSize = bufferSize.nextPowerOfTwo();
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if (!textureSize.equals(mSize)) {
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mSize = textureSize;
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// Delete the old texture
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if (mTextureIDs != null) {
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TextureReaper.get().add(mTextureIDs);
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mTextureIDs = null;
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// Free the texture immediately, so we don't incur a
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// temporarily increased memory usage.
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TextureReaper.get().reap(gl);
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}
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}
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}
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/**
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* Tells the tile that its texture contents are invalid. This will also
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* clear any invalidated area.
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*/
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public void invalidateTexture() {
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mValidTextureRect.setEmpty();
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mDirtyRect.setEmpty();
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}
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/**
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* Returns a handle to the valid texture area rectangle. Modifying this
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* Rect will modify the valid texture area for this layer.
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*/
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public Rect getValidTextureArea() {
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return mValidTextureRect;
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}
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@Override
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protected boolean performUpdates(GL10 gl, RenderContext context) {
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super.performUpdates(gl, context);
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// Reallocate the texture if the size has changed
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validateTexture(gl);
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// Don't do any work if the image has an invalid size.
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if (!mImage.getSize().isPositive())
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return true;
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// Update the dirty region
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uploadDirtyRect(gl, mDirtyRect);
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mDirtyRect.setEmpty();
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return true;
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}
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private void uploadDirtyRect(GL10 gl, Rect dirtyRect) {
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IntSize bufferSize = mImage.getSize();
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Rect bufferRect = new Rect(0, 0, bufferSize.width, bufferSize.height);
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// Make sure the dirty region intersects with the buffer
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dirtyRect.intersect(bufferRect);
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// If we have nothing to upload, just return for now
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if (dirtyRect.isEmpty())
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return;
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// It's possible that the buffer will be null, check for that and return
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ByteBuffer imageBuffer = mImage.getBuffer();
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if (imageBuffer == null)
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return;
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// Mark the dirty region as valid. Note, we assume that the valid area
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// can be enclosed by a rectangle (ideally we'd use a Region, but it'd
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// be slower and it probably isn't necessary).
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mValidTextureRect.union(dirtyRect);
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boolean newlyCreated = false;
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if (mTextureIDs == null) {
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mTextureIDs = new int[1];
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gl.glGenTextures(mTextureIDs.length, mTextureIDs, 0);
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newlyCreated = true;
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}
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int cairoFormat = mImage.getFormat();
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CairoGLInfo glInfo = new CairoGLInfo(cairoFormat);
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bindAndSetGLParameters(gl);
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if (newlyCreated || dirtyRect.equals(bufferRect)) {
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if (mSize.equals(bufferSize)) {
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gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, glInfo.internalFormat, mSize.width, mSize.height,
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0, glInfo.format, glInfo.type, imageBuffer);
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return;
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} else {
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gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, glInfo.internalFormat, mSize.width, mSize.height,
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0, glInfo.format, glInfo.type, null);
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gl.glTexSubImage2D(gl.GL_TEXTURE_2D, 0, 0, 0, bufferSize.width, bufferSize.height,
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glInfo.format, glInfo.type, imageBuffer);
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return;
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}
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}
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/*
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* Upload the changed rect. We have to widen to the full width of the texture
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* because we can't count on the device having support for GL_EXT_unpack_subimage,
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* and going line-by-line is too slow.
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*
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* XXX We should still use GL_EXT_unpack_subimage when available.
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*/
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Buffer viewBuffer = imageBuffer.slice();
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int bpp = CairoUtils.bitsPerPixelForCairoFormat(cairoFormat) / 8;
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int position = dirtyRect.top * bufferSize.width * bpp;
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if (position > viewBuffer.limit()) {
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Log.e(LOGTAG, "### Position outside tile! " + dirtyRect.top);
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return;
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}
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viewBuffer.position(position);
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gl.glTexSubImage2D(gl.GL_TEXTURE_2D, 0, 0, dirtyRect.top,
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bufferSize.width, dirtyRect.height(),
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glInfo.format, glInfo.type, viewBuffer);
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}
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private void bindAndSetGLParameters(GL10 gl) {
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gl.glBindTexture(GL10.GL_TEXTURE_2D, mTextureIDs[0]);
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gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST);
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gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
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int repeatMode = mRepeat ? GL10.GL_REPEAT : GL10.GL_CLAMP_TO_EDGE;
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gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, repeatMode);
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gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, repeatMode);
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}
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}
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