| /****************************************************************************** |
| * Copyright (c) 2005, 2009 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| ****************************************************************************/ |
| |
| package org.eclipse.gmf.runtime.draw2d.ui.render.internal; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.eclipse.draw2d.Graphics; |
| import org.eclipse.draw2d.geometry.Dimension; |
| import org.eclipse.draw2d.geometry.Rectangle; |
| import org.eclipse.gmf.runtime.draw2d.ui.render.RenderInfo; |
| import org.eclipse.gmf.runtime.draw2d.ui.render.RenderedImage; |
| import org.eclipse.swt.graphics.Image; |
| |
| /** |
| * @author sshaw |
| */ |
| public class RenderHelper { |
| |
| double scale = 1.0; |
| |
| boolean scaleTargetCoordinates = true; |
| |
| boolean allowDelayRender = false; |
| |
| private Dimension maximumRenderSize = null; |
| |
| private RenderHelper(double scale, boolean scaleTargetCoordinates, |
| boolean allowDelayRender, Dimension maximumRenderSize) { |
| super(); |
| this.scale = scale; |
| this.allowDelayRender = allowDelayRender; |
| this.scaleTargetCoordinates = scaleTargetCoordinates; |
| this.maximumRenderSize = maximumRenderSize; |
| } |
| |
| static public RenderHelper getInstance(double scale, |
| boolean scaleDrawable, boolean allowDelayRender, Dimension maximumRenderSize) { |
| return new RenderHelper(scale, scaleDrawable, |
| allowDelayRender, maximumRenderSize); |
| } |
| |
| private boolean shouldScaleTargetCoordinates() { |
| return scaleTargetCoordinates; |
| } |
| |
| private boolean shouldAllowDelayRender() { |
| return allowDelayRender; |
| } |
| |
| private double getScale() { |
| return scale; |
| } |
| |
| /** |
| * @return Returns the maximumRenderSize. |
| */ |
| private Dimension getMaximumRenderSize() { |
| return maximumRenderSize; |
| } |
| |
| private static Map threadMap = new HashMap(); |
| |
| /** |
| * Allows for asynchronous execution of the rendering. The |
| * <code>RenderingListener</code |
| * will be notified when the rendering operation has been completed. |
| * |
| * @param srcImage the <code>RenderedImage that is to be rendered into an <code>Image</code> |
| * @param listener the <code>RenderingListener</code |
| * that be notified when the rendering operation has been completed. |
| * @return <code>true</code> if rendering is already completed and clients can simply call |
| * <code>getSWTImage</code> to retrieve image immediately, <code>false</code> |
| * if it has to be calculated and has spawned a thread to do the rendering. After the rendering |
| * is completed the <code>RenderingListener</code> listener will be notified |
| */ |
| private boolean renderSWTImage(RenderedImage srcImage, |
| final RenderingListener listener) { |
| if (srcImage.isRendered()) |
| return true; |
| |
| Thread existingThread = (Thread)threadMap.get(listener); |
| if (existingThread != null) { |
| existingThread.interrupt(); |
| threadMap.remove(listener); |
| } |
| |
| final RenderedImage rndImg = srcImage; |
| final Thread renderThread = new Thread(new Runnable() { |
| public void run() { |
| |
| Image img = null; |
| try { |
| img = rndImg.getSWTImage(); |
| } catch (RuntimeException e) { |
| threadMap.remove(listener); |
| throw e; |
| } |
| |
| if (img != null) |
| listener.imageRendered(rndImg); |
| threadMap.remove(listener); |
| } |
| }); |
| |
| threadMap.put(listener, renderThread); |
| renderThread.start(); |
| |
| return false; |
| } |
| |
| private static final int RENDER_TOLERANCE = 5; |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.gmf.runtime.draw2d.ui.render.internal.DrawableRenderedImage#drawRenderedImage(org.eclipse.gmf.runtime.draw2d.ui.render.RenderedImage, |
| * int, int, int, int) |
| */ |
| public RenderedImage drawRenderedImage(Graphics g, RenderedImage srcImage, |
| Rectangle rect, RenderingListener listener) { |
| Rectangle targetRect = rect.getCopy(); |
| if (shouldScaleTargetCoordinates()) |
| targetRect.performScale(getScale()); |
| |
| if (g instanceof DrawableRenderedImage) { |
| return ((DrawableRenderedImage) g).drawRenderedImage(srcImage, targetRect, |
| listener); |
| } else { |
| Rectangle sourceRect = rect.getCopy(); |
| sourceRect.performScale(getScale()); |
| |
| RenderedImage trgImage = calculateTargetImage(srcImage, sourceRect); |
| |
| if (!shouldAllowDelayRender() || renderSWTImage(trgImage, listener)) { |
| Image swtImg = trgImage.getSWTImage(); |
| if (swtImg != null) { |
| org.eclipse.swt.graphics.Rectangle imgBox = swtImg.getBounds(); |
| g.drawImage(swtImg, 0, 0, imgBox.width, imgBox.height, |
| targetRect.x, targetRect.y, targetRect.width, targetRect.height); |
| } |
| } else { |
| // check if the srcImage is rendered and if so scale it's image for |
| // display |
| if (srcImage.isRendered()) { |
| Image swtImg = srcImage.getSWTImage(); |
| |
| org.eclipse.swt.graphics.Rectangle imgBox = swtImg.getBounds(); |
| g.drawImage(swtImg, 0, 0, imgBox.width, imgBox.height, |
| targetRect.x, targetRect.y, targetRect.width, targetRect.height); |
| return srcImage; |
| } |
| } |
| |
| return trgImage; |
| } |
| } |
| |
| /** |
| * @param srcImage |
| * @param sourceRect |
| * @return |
| */ |
| private RenderedImage calculateTargetImage(RenderedImage srcImage, Rectangle sourceRect) { |
| RenderedImage trgImage = srcImage; |
| RenderInfo info = trgImage.getRenderInfo(); |
| // Account for rounding errors - if the size of the image and source rectangle |
| // are within a tolerance, don't re-render the image. |
| if (Math.abs(sourceRect.width - info.getWidth()) > RENDER_TOLERANCE || |
| Math.abs(sourceRect.height - info.getHeight()) > RENDER_TOLERANCE) { |
| info.setValues(sourceRect.width, sourceRect.height, info.shouldMaintainAspectRatio(), info |
| .shouldAntiAlias(), info.getBackgroundColor(), info |
| .getForegroundColor()); |
| |
| trgImage = srcImage.getNewRenderedImage(info); |
| info = trgImage.getRenderInfo(); |
| } |
| |
| // test for maximum rendering size |
| if (getMaximumRenderSize() == null) |
| return trgImage; |
| |
| if (sourceRect.width > getMaximumRenderSize().width || |
| sourceRect.height > getMaximumRenderSize().height) { |
| if (sourceRect.width > getMaximumRenderSize().width) { |
| double ratio = (double)sourceRect.height / sourceRect.width; |
| sourceRect.width = getMaximumRenderSize().width; |
| sourceRect.height = (int)Math.round(sourceRect.width * ratio); |
| } |
| |
| if (sourceRect.height > getMaximumRenderSize().height) { |
| double ratio = (double)sourceRect.width / sourceRect.height; |
| sourceRect.height = getMaximumRenderSize().height; |
| sourceRect.width = (int)Math.round(sourceRect.height * ratio); |
| } |
| |
| info.setValues(sourceRect.width, sourceRect.height, info.shouldMaintainAspectRatio(), info |
| .shouldAntiAlias(), info.getBackgroundColor(), info |
| .getForegroundColor()); |
| |
| trgImage = srcImage.getNewRenderedImage(info); |
| info = trgImage.getRenderInfo(); |
| } |
| |
| return trgImage; |
| } |
| } |