org.eclipse.jface.resource.ImageDataImageDescriptor Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2004, 2007 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.jface.resource;
import org.eclipse.swt.graphics.Device;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
/**
* @since 1.0
*/
class ImageDataImageDescriptor extends ImageDescriptor {
private ImageData data;
/**
* Original image being described, or null if this image is described
* completely using its ImageData
*/
private Image originalImage = null;
/**
* Creates an image descriptor, given an image and the device it was created on.
*
* @param originalImage
*/
ImageDataImageDescriptor(Image originalImage) {
this(originalImage.getImageData());
this.originalImage = originalImage;
}
/**
* Creates an image descriptor, given some image data.
*
* @param data describing the image
*/
ImageDataImageDescriptor(ImageData data) {
this.data = data;
}
/* (non-Javadoc)
* @see org.eclipse.jface.resource.DeviceResourceDescriptor#create(org.eclipse.swt.graphics.Device)
*/
public Object createResource(Device device) throws DeviceResourceException {
// If this descriptor is an existing font, then we can return the original font
// if this is the same device.
if (originalImage != null) {
// If we're allocating on the same device as the original font, return the original.
if (originalImage.getDevice() == device) {
return originalImage;
}
}
return super.createResource(device);
}
/* (non-Javadoc)
* @see org.eclipse.jface.resource.DeviceResourceDescriptor#destroy(java.lang.Object)
*/
public void destroyResource(Object previouslyCreatedObject) {
if (previouslyCreatedObject == originalImage) {
return;
}
super.destroyResource(previouslyCreatedObject);
}
/* (non-Javadoc)
* @see org.eclipse.jface.resource.ImageDescriptor#getImageData()
*/
public ImageData getImageData() {
return data;
}
/* (non-Javadoc)
* @see Object#hashCode
*/
public int hashCode() {
if (originalImage != null) {
return System.identityHashCode(originalImage);
}
return data.hashCode();
}
/* (non-Javadoc)
* @see Object#equals
*/
public boolean equals(Object obj) {
if (!(obj instanceof ImageDataImageDescriptor)) {
return false;
}
ImageDataImageDescriptor imgWrap = (ImageDataImageDescriptor) obj;
//Intentionally using == instead of equals() as Image.hashCode() changes
//when the image is disposed and so leaks may occur with equals()
if (originalImage != null) {
return imgWrap.originalImage == originalImage;
}
return (imgWrap.originalImage == null && data.equals(imgWrap.data));
}
}