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/*
* Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package demos.xtrans;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Rectangle;
import javax.swing.JComponent;
// Internal JOGL API references
import jogamp.opengl.Debug;
// FIXME: debugging only
import jogamp.opengl.awt.Java2D;
/** Provides an interposition point where we can install a new
* Graphics object in the rendering pipeline. Because lightweight
* components always delegate up to their parents to fetch Graphics
* objects, we can use this point to swap in the off-screen
* VolatileImage we're using for rendering. Applications should not
* need to construct instances of this class directly, though they may
* encounter them when traversing the component hierarchy created by
* the OffscreenDesktopPane, since they are automatically inserted
* during add operations.
*
* @author Kenneth Russell
*/
public class OffscreenComponentWrapper extends JComponent {
private static final boolean DEBUG = Debug.debug("OffscreenComponentWrapper");
/** Instantiates an OffscreenComponentWrapper. This should not be
called directly by applications. */
public OffscreenComponentWrapper(Component arg) {
if (arg == null) {
throw new RuntimeException("Null argument");
}
add(arg);
setOpaque(false);
}
protected void addImpl(Component c, Object constraints, int index) {
if (getComponentCount() != 0) {
throw new RuntimeException("May only add one child");
}
super.addImpl(c, constraints, index);
}
/** Returns the sole child component of this one. */
public Component getChild() {
if (getComponentCount() == 0) {
throw new RuntimeException("No child found");
}
return getComponent(0);
}
public void remove(int i) {
super.remove(i);
throw new RuntimeException("Should not call this");
}
public void remove(Component c) {
super.remove(c);
throw new RuntimeException("Should not call this");
}
/** Overrides the superclass's getGraphics() in order to provide a
correctly-translated Graphics object on the
OffscreenDesktopPane's back buffer. */
public Graphics getGraphics() {
Component parent = getParent();
if ((parent != null) && (parent instanceof OffscreenDesktopPane)) {
OffscreenDesktopPane desktop = (OffscreenDesktopPane) parent;
OffscreenDesktopManager manager = (OffscreenDesktopManager) desktop.getDesktopManager();
// Find out where the component we're rendering lives on the back buffer
Graphics g = manager.getOffscreenGraphics();
Rectangle bounds = manager.getBoundsOnBackBuffer(getChild());
if (bounds == null) {
if (DEBUG) {
System.err.println("No bounds for child");
}
// Not yet laid out on back buffer; however, avoid painting to
// screen
return g;
}
if (DEBUG) {
System.err.println("Graphics.translate(" + bounds.x + "," + bounds.y + ")");
System.err.println(" Surface identifier = " + Java2D.getOGLSurfaceIdentifier(g));
}
g.translate(bounds.x, bounds.y);
// Also take into account the translation of the child
Component c = getChild();
g.translate(-c.getX(), -c.getY());
// Make sure any changes the user made to the double-buffering
// of child components don't mess up the rendering results
OffscreenDesktopManager.switchDoubleBuffering(this, false);
// A child component will be performing drawing and therefore
// get the OpenGL copy of the back buffer out of sync; will need
// to repair it
// NOTE: in theory we should only need to set the copy back
// state on the OffscreenDesktopManager. However it seems that
// there are certain operations (like scrolling in a
// JScrollPane) that have unanticipated consequences, such as
// drawing into the Swing back buffer (which is heavily
// undesirable, because it can cause on-screen visual artifacts
// in our rendering paradigm) as well as potentially
// inadvertently copying regions of the back buffer from one
// place to another. Since we don't know the side effects of
// such operations we currently need to treat the entire back
// buffer as being dirty.
manager.setNeedsRedraw();
// NOTE: this is a bit of a hack but we need to indicate to the
// parent desktop that it is dirty as well since one of its
// children (being painted by alternate means) needs to be
// redrawn
desktop.repaint();
return g;
} else {
return super.getGraphics();
}
}
public void paintComponent(Graphics g) {
}
protected void paintChildren(Graphics g) {
}
}
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