/*
* Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package sun.awt;
import java.awt.*;
import java.awt.image.*;
/**
* A class to encapsulate a custom image-based cursor.
*
* @author ThomasBall
*/
@SuppressWarnings("serial") // JDK-implementation class
public abstract class CustomCursor extends Cursor {
protected Image image;
public CustomCursor(Image cursor, Point hotSpot, String name)
throws IndexOutOfBoundsException {
super(name);
image = cursor;
Toolkit toolkit = Toolkit.getDefaultToolkit();
// Make sure image is fully loaded.
Component c = new Canvas(); // for its imageUpdate method
MediaTracker tracker = new MediaTracker(c);
tracker.addImage(cursor, 0);
try {
tracker.waitForAll();
} catch (InterruptedException e) {
}
int width = cursor.getWidth(c);
int height = cursor.getHeight(c);
// Fix for bug 4212593 The Toolkit.createCustomCursor does not
// check absence of the image of cursor
// If the image is invalid, the cursor will be hidden (made completely
// transparent). In this case, getBestCursorSize() will adjust negative w and h,
// but we need to set the hotspot inside the image here.
if (tracker.isErrorAny() || width < 0 || height < 0) {
hotSpot.x = hotSpot.y = 0;
}
// Scale image to nearest supported size.
Dimension nativeSize = toolkit.getBestCursorSize(width, height);
if ((nativeSize.width != width || nativeSize.height != height) &&
(nativeSize.width != 0 && nativeSize.height != 0)) {
cursor = cursor.getScaledInstance(nativeSize.width,
nativeSize.height,
Image.SCALE_DEFAULT);
width = nativeSize.width;
height = nativeSize.height;
}
// Verify that the hotspot is within cursor bounds.
if (hotSpot.x >= width || hotSpot.y >= height || hotSpot.x < 0 || hotSpot.y < 0) {
throw new IndexOutOfBoundsException("invalid hotSpot");
}
/* Extract ARGB array from image.
*
* A transparency mask can be created in native code by checking
* each pixel's top byte -- a 0 value means the pixel's transparent.
* Since each platform's format of the bitmap and mask are likely to
* be different, their creation shouldn't be here.
*/
int[] pixels = new int[width * height];
ImageProducer ip = cursor.getSource();
PixelGrabber pg = new PixelGrabber(ip, 0, 0, width, height,
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