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https://github.com/mozilla/gecko-dev.git
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e15085320f
Fix overdrawing of the checkerboard layer by letting layers have a concept of a display-port, and keeping the root layer's display port in track with Gecko's.
247 lines
8.8 KiB
Java
247 lines
8.8 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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* Chris Lord <chrislord.net@gmail.com>
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* Arkady Blyakher <rkadyb@mit.edu>
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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.graphics.Region;
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import android.util.Log;
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import java.nio.FloatBuffer;
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import java.util.concurrent.locks.ReentrantLock;
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import org.mozilla.gecko.FloatUtils;
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public abstract class Layer {
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private final ReentrantLock mTransactionLock;
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private boolean mInTransaction;
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private Rect mNewPosition;
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private float mNewResolution;
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private Rect mNewDisplayPort;
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protected Rect mPosition;
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protected float mResolution;
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protected Rect mDisplayPort;
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public Layer() {
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this(null);
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}
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public Layer(IntSize size) {
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mTransactionLock = new ReentrantLock();
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if (size == null) {
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mPosition = new Rect();
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} else {
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mPosition = new Rect(0, 0, size.width, size.height);
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}
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mResolution = 1.0f;
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}
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/**
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* Updates the layer. This returns false if there is still work to be done
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* after this update.
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*/
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public final boolean update(RenderContext context) {
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if (mTransactionLock.isHeldByCurrentThread()) {
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throw new RuntimeException("draw() called while transaction lock held by this " +
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"thread?!");
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}
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if (mTransactionLock.tryLock()) {
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try {
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return performUpdates(context);
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} finally {
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mTransactionLock.unlock();
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}
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}
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return false;
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}
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/** Subclasses override this function to draw the layer. */
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public abstract void draw(RenderContext context);
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/** Given the intrinsic size of the layer, returns the pixel boundaries of the layer rect. */
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protected RectF getBounds(RenderContext context) {
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return RectUtils.scale(new RectF(mPosition), context.zoomFactor / mResolution);
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}
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/**
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* Returns the pixel boundaries of the layer's display-port rect. If no display port
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* is set, returns the bounds of the layer.
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*/
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protected RectF getDisplayPortBounds(RenderContext context) {
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if (mDisplayPort != null)
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return RectUtils.scale(new RectF(mDisplayPort), context.zoomFactor / mResolution);
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return getBounds(context);
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}
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/**
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* Returns the region of the layer that is considered valid. The default
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* implementation of this will return the display-port bounds of the layer,
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* but this may be overridden.
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*/
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public Region getValidRegion(RenderContext context) {
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return new Region(RectUtils.round(getDisplayPortBounds(context)));
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}
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/**
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* Call this before modifying the layer. Note that, for TileLayers, "modifying the layer"
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* includes altering the underlying CairoImage in any way. Thus you must call this function
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* before modifying the byte buffer associated with this layer.
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*
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* This function may block, so you should never call this on the main UI thread.
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*/
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public void beginTransaction() {
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if (mTransactionLock.isHeldByCurrentThread())
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throw new RuntimeException("Nested transactions are not supported");
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mTransactionLock.lock();
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mInTransaction = true;
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mNewResolution = mResolution;
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}
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/** Call this when you're done modifying the layer. */
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public void endTransaction() {
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if (!mInTransaction)
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throw new RuntimeException("endTransaction() called outside a transaction");
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mInTransaction = false;
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mTransactionLock.unlock();
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}
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/** Returns true if the layer is currently in a transaction and false otherwise. */
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protected boolean inTransaction() {
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return mInTransaction;
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}
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/** Returns the current layer position. */
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public Rect getPosition() {
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return mPosition;
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}
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/** Sets the position. Only valid inside a transaction. */
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public void setPosition(Rect newPosition) {
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if (!mInTransaction)
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throw new RuntimeException("setPosition() is only valid inside a transaction");
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mNewPosition = newPosition;
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}
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/** Returns the current layer's resolution. */
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public float getResolution() {
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return mResolution;
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}
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/**
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* Sets the layer resolution. This value is used to determine how many pixels per
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* device pixel this layer was rendered at. This will be reflected by scaling by
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* the reciprocal of the resolution in the layer's transform() function.
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* Only valid inside a transaction. */
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public void setResolution(float newResolution) {
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if (!mInTransaction)
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throw new RuntimeException("setResolution() is only valid inside a transaction");
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mNewResolution = newResolution;
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}
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/**
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* Returns the layer's display port, or null if none is set. This is the
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* rectangle that represents the area the layer will render, which may be
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* different to its position.
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*/
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public Rect getDisplayPort() {
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return mDisplayPort;
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}
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/** Sets the layer's display port. */
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public void setDisplayPort(Rect newDisplayPort) {
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if (!mInTransaction)
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throw new RuntimeException("setDisplayPort() is only valid inside a transaction");
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mNewDisplayPort = newDisplayPort;
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}
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/**
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* Subclasses may override this method to perform custom layer updates. This will be called
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* with the transaction lock held. Subclass implementations of this method must call the
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* superclass implementation. Returns false if there is still work to be done after this
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* update is complete.
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*/
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protected boolean performUpdates(RenderContext context) {
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if (mNewPosition != null) {
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mPosition = mNewPosition;
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mNewPosition = null;
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}
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if (mNewDisplayPort != null) {
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mDisplayPort = mNewDisplayPort;
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mNewDisplayPort = null;
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}
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if (mNewResolution != 0.0f) {
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mResolution = mNewResolution;
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mNewResolution = 0.0f;
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}
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return true;
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}
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public static class RenderContext {
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public final RectF viewport;
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public final FloatSize pageSize;
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public final float zoomFactor;
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public final int positionHandle;
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public final int textureHandle;
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public final FloatBuffer coordBuffer;
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public RenderContext(RectF aViewport, FloatSize aPageSize, float aZoomFactor,
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int aPositionHandle, int aTextureHandle, FloatBuffer aCoordBuffer) {
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viewport = aViewport;
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pageSize = aPageSize;
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zoomFactor = aZoomFactor;
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positionHandle = aPositionHandle;
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textureHandle = aTextureHandle;
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coordBuffer = aCoordBuffer;
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}
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public boolean fuzzyEquals(RenderContext other) {
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if (other == null) {
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return false;
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}
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return RectUtils.fuzzyEquals(viewport, other.viewport)
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&& pageSize.fuzzyEquals(other.pageSize)
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&& FloatUtils.fuzzyEquals(zoomFactor, other.zoomFactor);
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}
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}
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}
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