org.eclipse.compare.internal.DiffImageDescriptor Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 2011 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.compare.internal;
import org.eclipse.swt.graphics.*;
import org.eclipse.jface.resource.CompositeImageDescriptor;
import org.eclipse.jface.resource.ImageDescriptor;
/**
* Combines an image with an overlay.
*/
public class DiffImageDescriptor extends CompositeImageDescriptor {
static final int HEIGHT= 16;
private final ImageData fBaseImageData;
private final ImageDescriptor fOverlayImage;
private final int fWidth;
private final boolean fLeft;
private final int hashCode;
public DiffImageDescriptor(Image base, ImageDescriptor overlay, int w, boolean onLeft) {
ImageData data = null;
if (base != null) {
data = base.getImageData();
if (data == null)
data = DEFAULT_IMAGE_DATA;
}
fBaseImageData = data;
fOverlayImage= overlay;
fWidth= w;
fLeft= onLeft;
hashCode = calculateHashCode();
}
private int calculateHashCode() {
int h1 = 0;
int h2 = 0;
if (fBaseImageData != null) {
h1 = calculateHash(fBaseImageData);
}
if (fOverlayImage != null) {
h2 = fOverlayImage.hashCode();
}
return h1 + h2 + fWidth;
}
private int calculateHash(ImageData baseImageData) {
byte[] data = baseImageData.data;
int hash = baseImageData.width + baseImageData.height;
for (int i = 0; i < data.length; i++) {
byte b = data[i];
hash >>>= 1;
hash ^= b;
}
return hash;
}
/* (non-Javadoc)
* @see org.eclipse.jface.resource.CompositeImageDescriptor#getSize()
*/
@Override
protected Point getSize() {
return new Point(fWidth, HEIGHT);
}
/* (non-Javadoc)
* @see org.eclipse.jface.resource.CompositeImageDescriptor#drawCompositeImage(int, int)
*/
@Override
protected void drawCompositeImage(int width, int height) {
if (fLeft) {
if (fBaseImageData != null) {
drawImage(fBaseImageData, fWidth - fBaseImageData.width, 0);
}
if (fOverlayImage != null) {
ImageData overlay= fOverlayImage.getImageData();
if (overlay == null)
overlay= DEFAULT_IMAGE_DATA;
drawImage(overlay, 0, (HEIGHT - overlay.height) / 2);
}
} else {
if (fBaseImageData != null) {
drawImage(fBaseImageData, 0, 0);
}
if (fOverlayImage != null) {
ImageData overlay= fOverlayImage.getImageData();
if (overlay == null)
overlay= DEFAULT_IMAGE_DATA;
drawImage(overlay, fWidth - overlay.width, (HEIGHT - overlay.height) / 2);
}
}
}
/* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return hashCode;
}
/* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if (obj == this)
return true;
if (obj instanceof DiffImageDescriptor) {
DiffImageDescriptor other = (DiffImageDescriptor) obj;
return (other.hashCode == hashCode
&& isEqual(other.fOverlayImage, fOverlayImage)
&& other.fWidth == fWidth
&& other.fLeft == fLeft
&& isEqual(other.fBaseImageData, fBaseImageData));
}
return false;
}
private boolean isEqual(ImageData i1, ImageData i2) {
if (isEqual((Object) i1, (Object) i2)) {
return true;
}
if (i1 == null || i2 == null)
return false;
return (i1.width == i2.width && i1.height == i2.height
&& i1.depth == i2.depth && i1.scanlinePad == i2.scanlinePad
&& i1.bytesPerLine == i2.bytesPerLine
/* && i1.palette == i2.palette */
&& i1.transparentPixel == i2.transparentPixel
&& i1.maskPad == i2.maskPad
&& i1.alpha == i2.alpha
&& i1.type == i2.type && i1.x == i2.x && i1.y == i2.y
&& i1.disposalMethod == i2.disposalMethod && i1.delayTime == i2.delayTime
&& equals(i1.data,i2.data) && equals(i1.maskData, i2.maskData)
&& equals(i1.alphaData, i2.alphaData));
}
private boolean equals(byte[] data, byte[] data2) {
if (isEqual(data, data2))
return true;
if (data == null || data2 == null)
return false;
if (data.length != data2.length)
return false;
for (int i = 0; i < data2.length; i++) {
if (data[i] != data2[i])
return false;
}
return true;
}
private boolean isEqual(Object o1, Object o2) {
if (o1 == o2)
return true;
if (o1 == null || o2 == null)
return false;
return o1.equals(o2);
}
}