src/java.desktop/unix/classes/sun/awt/X11/XCustomCursor.java

/*
 * Copyright (c) 2003, 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.X11;

import sun.awt.X11CustomCursor;
import java.awt.*;

/**
 * A class to encapsulate a custom image-based cursor.
 *
 * @see Component#setCursor
 * @author      Thomas Ball
 * @author      Bino George
 */
@SuppressWarnings("serial") // JDK-implementation class
public final class XCustomCursor extends X11CustomCursor {

    public XCustomCursor(Image cursor, Point hotSpot, String name)
      throws IndexOutOfBoundsException {
        super(cursor, hotSpot, name);
    }

    /**
     * Returns the supported cursor size
     */
    static Dimension getBestCursorSize(int preferredWidth, int preferredHeight) {

        // Fix for bug 4212593 The Toolkit.createCustomCursor does not
        //                     check absence of the image of cursor
        // We use XQueryBestCursor which accepts unsigned ints to obtain
        // the largest cursor size that could be displayed
        //Dimension d = new Dimension(Math.abs(preferredWidth), Math.abs(preferredHeight));
        Dimension d;

        XToolkit.awtLock();
        try {
            long display = XToolkit.getDisplay();
            long root_window = XlibWrapper.RootWindow(display,
                    XlibWrapper.DefaultScreen(display));

            XlibWrapper.XQueryBestCursor(display,root_window, Math.abs(preferredWidth),Math.abs(preferredHeight),XlibWrapper.larg1,XlibWrapper.larg2);
            d = new Dimension(XlibWrapper.unsafe.getInt(XlibWrapper.larg1),XlibWrapper.unsafe.getInt(XlibWrapper.larg2));
            if (preferredWidth > 0 && preferredHeight > 0) {
                d.width = Math.min(d.width, preferredWidth);
                d.height = Math.min(d.height, preferredHeight);
            }
        }
        finally {
            XToolkit.awtUnlock();
        }
        return d;
    }

    @Override
    protected void createCursor(byte[] xorMask, byte[] andMask,
                                int width, int height,
                                int fcolor, int bcolor,
                                int xHotSpot, int yHotSpot)
    {
        XToolkit.awtLock();
        try {
            long display = XToolkit.getDisplay();
            long root_window = XlibWrapper.RootWindow(display,
                    XlibWrapper.DefaultScreen(display));

            long colormap = XToolkit.getDefaultXColormap();
            XColor fore_color = new XColor();

            fore_color.set_flags((byte) (XConstants.DoRed | XConstants.DoGreen | XConstants.DoBlue));
            fore_color.set_red((short)(((fcolor >> 16) & 0x000000ff) << 8));
            fore_color.set_green((short) (((fcolor >> 8) & 0x000000ff) << 8));
            fore_color.set_blue((short)(((fcolor >> 0) & 0x000000ff) << 8));

            XlibWrapper.XAllocColor(display,colormap,fore_color.pData);


            XColor back_color = new XColor();
            back_color.set_flags((byte) (XConstants.DoRed | XConstants.DoGreen | XConstants.DoBlue));

            back_color.set_red((short) (((bcolor >> 16) & 0x000000ff) << 8));
            back_color.set_green((short) (((bcolor >> 8) & 0x000000ff) << 8));
            back_color.set_blue((short) (((bcolor >> 0) & 0x000000ff) << 8));

            XlibWrapper.XAllocColor(display,colormap,back_color.pData);


            long nativeXorMask = Native.toData(xorMask);
            long source = XlibWrapper.XCreateBitmapFromData(display,root_window,nativeXorMask,width,height);

            long nativeAndMask = Native.toData(andMask);
            long mask =  XlibWrapper.XCreateBitmapFromData(display,root_window,nativeAndMask,width,height);

            long cursor = XlibWrapper.XCreatePixmapCursor(display,source,mask,fore_color.pData,back_color.pData,xHotSpot,yHotSpot);

            XlibWrapper.unsafe.freeMemory(nativeXorMask);
            XlibWrapper.unsafe.freeMemory(nativeAndMask);
            XlibWrapper.XFreePixmap(display,source);
            XlibWrapper.XFreePixmap(display,mask);
            back_color.dispose();
            fore_color.dispose();

            XGlobalCursorManager.setPData(this,cursor);
        }
        finally {
            XToolkit.awtUnlock();
        }

    }
}