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/**Implements the Edit/Undo command.*/
package ij;
import ij.process.*;
import java.awt.*;
import java.awt.image.*;
import ij.gui.*;
import ij.measure.Calibration;
/** This class consists of static methods and
fields that implement ImageJ's Undo command. */
public class Undo {
public static final int NOTHING = 0;
public static final int FILTER = 1;
public static final int TYPE_CONVERSION = 2;
public static final int PASTE = 3;
public static final int COMPOUND_FILTER = 4;
public static final int COMPOUND_FILTER_DONE = 5;
public static final int TRANSFORM = 6;
public static final int OVERLAY_ADDITION = 7;
private static int whatToUndo = NOTHING;
private static int imageID;
private static ImageProcessor ipCopy = null;
private static ImagePlus impCopy;
private static Calibration calCopy;
public static void setup(int what, ImagePlus imp) {
if (imp==null) {
whatToUndo = NOTHING;
reset();
return;
}
//IJ.log(imp.getTitle() + ": set up undo (" + what + ")");
if (what==FILTER && whatToUndo==COMPOUND_FILTER)
return;
if (what==COMPOUND_FILTER_DONE) {
if (whatToUndo==COMPOUND_FILTER)
whatToUndo = what;
return;
}
whatToUndo = what;
imageID = imp.getID();
if (what==TYPE_CONVERSION) {
ipCopy = imp.getProcessor();
calCopy = (Calibration)imp.getCalibration().clone();
} else if (what==TRANSFORM) {
impCopy = new ImagePlus(imp.getTitle(), imp.getProcessor().duplicate());
} else if (what==COMPOUND_FILTER) {
ImageProcessor ip = imp.getProcessor();
if (ip!=null)
ipCopy = ip.duplicate();
else
ipCopy = null;
} else if (what==OVERLAY_ADDITION) {
impCopy = null;
ipCopy = null;
} else
ipCopy = null;
}
public static void reset() {
if (whatToUndo==COMPOUND_FILTER || whatToUndo==OVERLAY_ADDITION)
return;
whatToUndo = NOTHING;
imageID = 0;
ipCopy = null;
impCopy = null;
calCopy = null;
//IJ.log("Undo: reset");
}
public static void undo() {
ImagePlus imp = WindowManager.getCurrentImage();
//IJ.log(imp.getTitle() + ": undo (" + whatToUndo + ") "+(imageID!=imp.getID()));
if (imp==null || imageID!=imp.getID()) {
if (imp!=null && !IJ.macroRunning()) { // does image still have an undo buffer?
ImageProcessor ip2 = imp.getProcessor();
ip2.swapPixelArrays();
imp.updateAndDraw();
} else
reset();
return;
}
switch (whatToUndo) {
case FILTER:
ImageProcessor ip = imp.getProcessor();
if (ip!=null) {
if (!IJ.macroRunning()) {
ip.swapPixelArrays();
imp.updateAndDraw();
return; // don't reset
} else {
ip.reset();
imp.updateAndDraw();
}
}
break;
case TYPE_CONVERSION:
case COMPOUND_FILTER:
case COMPOUND_FILTER_DONE:
if (ipCopy!=null) {
if (whatToUndo==TYPE_CONVERSION && calCopy!=null)
imp.setCalibration(calCopy);
if (swapImages(new ImagePlus("",ipCopy), imp)) {
imp.updateAndDraw();
return;
} else
imp.setProcessor(null, ipCopy);
}
break;
case TRANSFORM:
if (impCopy!=null) {
if (swapImages(impCopy, imp)) {
imp.updateAndDraw();
return;
} else
imp.setProcessor(impCopy.getTitle(), impCopy.getProcessor());
}
break;
case PASTE:
Roi roi = imp.getRoi();
if (roi!=null)
roi.abortPaste();
break;
case OVERLAY_ADDITION:
Overlay overlay = imp.getOverlay();
if (overlay==null)
{IJ.beep(); return;}
int size = overlay.size();
if (size>0) {
overlay.remove(size-1);
imp.draw();
} else {
IJ.beep();
return;
}
return; //don't reset
}
reset();
}
static boolean swapImages(ImagePlus imp1, ImagePlus imp2) {
if (imp1.getWidth()!=imp2.getWidth() || imp1.getHeight()!=imp2.getHeight()
|| imp1.getBitDepth()!=imp2.getBitDepth() || IJ.macroRunning())
return false;
ImageProcessor ip1 = imp1.getProcessor();
ImageProcessor ip2 = imp2.getProcessor();
double min1 = ip1.getMin();
double max1 = ip1.getMax();
double min2 = ip2.getMin();
double max2 = ip2.getMax();
ip2.setSnapshotPixels(ip1.getPixels());
ip2.swapPixelArrays();
ip1.setPixels(ip2.getSnapshotPixels());
ip2.setSnapshotPixels(null);
ip1.setMinAndMax(min2, max2);
ip2.setMinAndMax(min1, max1);
return true;
}
}
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