105 lines
4.2 KiB
Java
105 lines
4.2 KiB
Java
/*
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* Copyright (c) 1997, 1999, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.awt;
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import java.awt.*;
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import java.awt.image.*;
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/**
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* A class to encapsulate a custom image-based cursor.
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*
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* @author ThomasBall
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*/
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public abstract class CustomCursor extends Cursor {
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protected Image image;
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public CustomCursor(Image cursor, Point hotSpot, String name)
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throws IndexOutOfBoundsException {
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super(name);
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image = cursor;
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Toolkit toolkit = Toolkit.getDefaultToolkit();
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// Make sure image is fully loaded.
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Component c = new Canvas(); // for its imageUpdate method
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MediaTracker tracker = new MediaTracker(c);
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tracker.addImage(cursor, 0);
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try {
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tracker.waitForAll();
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} catch (InterruptedException e) {
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}
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int width = cursor.getWidth(c);
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int height = cursor.getHeight(c);
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// Fix for bug 4212593 The Toolkit.createCustomCursor does not
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// check absence of the image of cursor
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// If the image is invalid, the cursor will be hidden (made completely
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// transparent). In this case, getBestCursorSize() will adjust negative w and h,
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// but we need to set the hotspot inside the image here.
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if (tracker.isErrorAny() || width < 0 || height < 0) {
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hotSpot.x = hotSpot.y = 0;
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}
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// Scale image to nearest supported size.
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Dimension nativeSize = toolkit.getBestCursorSize(width, height);
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if ((nativeSize.width != width || nativeSize.height != height) &&
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(nativeSize.width != 0 && nativeSize.height != 0)) {
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cursor = cursor.getScaledInstance(nativeSize.width,
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nativeSize.height,
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Image.SCALE_DEFAULT);
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width = nativeSize.width;
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height = nativeSize.height;
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}
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// Verify that the hotspot is within cursor bounds.
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if (hotSpot.x >= width || hotSpot.y >= height || hotSpot.x < 0 || hotSpot.y < 0) {
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throw new IndexOutOfBoundsException("invalid hotSpot");
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}
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/* Extract ARGB array from image.
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*
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* A transparency mask can be created in native code by checking
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* each pixel's top byte -- a 0 value means the pixel's transparent.
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* Since each platform's format of the bitmap and mask are likely to
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* be different, their creation shouldn't be here.
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*/
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int[] pixels = new int[width * height];
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ImageProducer ip = cursor.getSource();
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PixelGrabber pg = new PixelGrabber(ip, 0, 0, width, height,
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pixels, 0, width);
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try {
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pg.grabPixels();
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} catch (InterruptedException e) {
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}
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createNativeCursor(image, pixels, width, height, hotSpot.x, hotSpot.y);
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}
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protected abstract void createNativeCursor(Image im, int[] pixels,
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int width, int height,
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int xHotSpot, int yHotSpot);
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}
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