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204 lines
7.4 KiB
Java
204 lines
7.4 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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*
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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.Point;
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import android.graphics.PointF;
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import android.graphics.RectF;
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import android.util.Log;
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import java.util.concurrent.locks.ReentrantLock;
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import javax.microedition.khronos.opengles.GL10;
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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 Point mOrigin;
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private Point mNewOrigin;
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private float mResolution;
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private float mNewResolution;
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private LayerView mView;
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public Layer() {
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mTransactionLock = new ReentrantLock();
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mOrigin = new Point(0, 0);
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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(GL10 gl, 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(gl, 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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/** Subclasses override this function to provide access to the size of the layer. */
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public abstract IntSize getSize();
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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, FloatSize size) {
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float scaleFactor = context.zoomFactor / mResolution;
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float x = mOrigin.x * scaleFactor, y = mOrigin.y * scaleFactor;
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float width = size.width * scaleFactor, height = size.height * scaleFactor;
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return new RectF(x, y, x + width, y + height);
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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(LayerView aView) {
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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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mView = aView;
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mInTransaction = true;
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mNewResolution = mResolution;
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}
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public void beginTransaction() {
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beginTransaction(null);
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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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if (mView != null)
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mView.requestRender();
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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 origin. */
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public Point getOrigin() {
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return mOrigin;
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}
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/** Sets the origin. Only valid inside a transaction. */
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public void setOrigin(Point newOrigin) {
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if (!mInTransaction)
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throw new RuntimeException("setOrigin() is only valid inside a transaction");
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mNewOrigin = newOrigin;
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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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* 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(GL10 gl, RenderContext context) {
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if (mNewOrigin != null) {
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mOrigin = mNewOrigin;
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mNewOrigin = 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 RenderContext(RectF aViewport, FloatSize aPageSize, float aZoomFactor) {
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viewport = aViewport;
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pageSize = aPageSize;
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zoomFactor = aZoomFactor;
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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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