com.openhtmltopdf.swing.ImageLoadWorker Maven / Gradle / Ivy
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Open HTML to PDF is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code.
/*
* {{{ header & license
* Copyright (c) 2009 Patrick Wright
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* }}}
*/
package com.openhtmltopdf.swing;
import com.openhtmltopdf.extend.FSImage;
import com.openhtmltopdf.resource.ImageResource;
import com.openhtmltopdf.util.ImageUtil;
import com.openhtmltopdf.util.XRLog;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.logging.Level;
/**
* A background thread (daemon, low priority) which reads BackgroundImageLoaderItem from a BackgroundImageQueue
* and loads the images into memory. Once images have loaded, the item's MutableFSImage will receive the newly loaded
* image via setImage(newImage). Images, once loaded, are always BufferedImages and will always be compatible with
* the current screen's graphics configuration. If an image cannot be loaded (network failure), a 1 x 1 pixel image
* will be returned instead and the problem will be logged.
*/
class ImageLoadWorker extends Thread {
private static volatile int counter = 0;
private final ImageLoadQueue queue;
public ImageLoadWorker(ImageLoadQueue queue) {
this.queue = queue;
setDaemon(true);
setPriority(Thread.MIN_PRIORITY);
setName("ImageLoadWorker(" + counter++ + ")");
}
public void run() {
try {
while (true) {
final ImageLoadItem loadItem = queue.getTask();
if (ImageLoadQueue.isKillSwitch(loadItem)) {
break;
}
final ImageResource ir = ImageResourceLoader.loadImageResourceFromUri(loadItem._uri);
FSImage awtfsImage = ir.getImage();
BufferedImage newImg = (BufferedImage) ((AWTFSImage) awtfsImage).getImage();
XRLog.load(Level.FINE, this + ", loaded " + loadItem._uri);
loadItem._imageResourceLoader.loaded(ir, newImg.getWidth(), newImg.getHeight());
final boolean wasScaled;
if (loadItem.haveTargetDimensions() && !ir.hasDimensions(loadItem._targetWidth, loadItem._targetHeight)) {
XRLog.load(Level.FINE, this + ", scaling " + loadItem._uri + " to " + loadItem._targetWidth + ", " + loadItem._targetHeight);
newImg = ImageUtil.getScaledInstance(newImg, loadItem._targetWidth, loadItem._targetHeight);
ImageResource sir = new ImageResource(ir.getImageUri(), AWTFSImage.createImage(newImg));
loadItem._imageResourceLoader.loaded(sir, newImg.getWidth(), newImg.getHeight());
wasScaled = true;
} else {
wasScaled = false;
}
// msfImage belongs to the Swing AWT thread
final BufferedImage newImg1 = newImg;
EventQueue.invokeLater(new Runnable() {
public void run() {
loadItem._mfsImage.setImage(loadItem._uri, newImg1, wasScaled);
}
});
}
} catch (InterruptedException e) {
//
}
}
}