Makefile.am (gtk_awt_peer_sources): Add GtkVolatileImage.java.

2005-05-06  Thomas Fitzsimmons  <fitzsim@redhat.com>

	* Makefile.am (gtk_awt_peer_sources): Add GtkVolatileImage.java.
	* Makefile.in: Regenerate.
	* gnu/java/awt/peer/gtk/GdkGraphicsConfiguration.java
	(createCompatibleVolatileImage(int,int)): Implement.
	(createCompatibleVolatileImage(int,int,ImageCapabilities)):
	Likewise.
	* gnu/java/awt/peer/gtk/GtkComponentPeer.java (backBuffer, caps):
	New fields.
	(createVolatileImage): Implement.
	(createBuffers): Likewise.
	(getBackBuffer): Likewise.
	(flip): Likewise.
	(destroyBuffers): Likewise.
	* gnu/java/awt/peer/gtk/GtkVolatileImage.java: New file.
	* java/awt/Canvas.java (CanvasBltBufferStrategy): New class.
	(CanvasFlipBufferStrategy): Likewise.
	(createBufferStrategy(int)): New method.
	(createBufferStrategy(int,BufferCapabilities)): Likewise.
	* java/awt/Component.java (BltBufferStrategy): Implement and
	document class.
	(FlipBufferStrategy): Likewise.
	* java/awt/Window.java (WindowBltBufferStrategy): New class.
	(WindowFlipBufferStrategy): Likewise.
	(createBufferStrategy(int)): New method.
	(createBufferStrategy(int,BufferCapabilities)): Likewise.
	(getBufferStrategy): Likewise.
	* java/awt/BufferCapabilities.java (BufferCapabilities): Rename
	front to frontCaps and back to backCaps.

From-SVN: r99336

libjava/gnu/java/awt/peer/gtk/GdkGraphicsConfiguration.java

@@ -86,14 +86,14 @@ public class GdkGraphicsConfiguration
 
   public VolatileImage createCompatibleVolatileImage(int w, int h)
   {
-    throw new java.lang.UnsupportedOperationException ();
+    return new GtkVolatileImage(w, h);
   }
 
   public VolatileImage createCompatibleVolatileImage(int w, int h,
                                                      ImageCapabilities caps)
     throws java.awt.AWTException
   {
-    throw new java.lang.UnsupportedOperationException ();
+    return new GtkVolatileImage(w, h, caps);
   }
 
   public ColorModel getColorModel()

libjava/gnu/java/awt/peer/gtk/GtkComponentPeer.java

@@ -39,6 +39,7 @@ exception statement from your version. */
 package gnu.java.awt.peer.gtk;
 
 import java.awt.AWTEvent;
+import java.awt.AWTException;
 import java.awt.BufferCapabilities;
 import java.awt.Color;
 import java.awt.Component;
@@ -71,6 +72,9 @@ import java.awt.peer.ComponentPeer;
 public class GtkComponentPeer extends GtkGenericPeer
   implements ComponentPeer
 {
+  VolatileImage backBuffer;
+  BufferCapabilities caps;
+
   Component awtComponent;
 
   Insets insets;
@@ -596,35 +600,63 @@ public class GtkComponentPeer extends GtkGenericPeer
     
   }
 
-  public VolatileImage createVolatileImage (int width, int height)
-  {
-    return null;
-  }
-
   public boolean handlesWheelScrolling ()
   {
     return false;
   }
 
-  public void createBuffers (int x, BufferCapabilities capabilities)
-    throws java.awt.AWTException
-
+  // Convenience method to create a new volatile image on the screen
+  // on which this component is displayed.
+  public VolatileImage createVolatileImage (int width, int height)
   {
-    
+    return new GtkVolatileImage (width, height);
   }
 
+  // Creates buffers used in a buffering strategy.
+  public void createBuffers (int numBuffers, BufferCapabilities caps)
+    throws AWTException
+  {
+    // numBuffers == 2 implies double-buffering, meaning one back
+    // buffer and one front buffer.
+    if (numBuffers == 2)
+      backBuffer = new GtkVolatileImage(awtComponent.getWidth(),
+					awtComponent.getHeight(),
+					caps.getBackBufferCapabilities());
+    else
+      throw new AWTException("GtkComponentPeer.createBuffers:"
+			     + " multi-buffering not supported");
+    this.caps = caps;
+  }
+
+  // Return the back buffer.
   public Image getBackBuffer ()
   {
-    return null;
+    return backBuffer;
   }
 
+  // FIXME: flip should be implemented as a fast native operation
   public void flip (BufferCapabilities.FlipContents contents)
   {
-    
+    getGraphics().drawImage(backBuffer,
+			    awtComponent.getWidth(),
+			    awtComponent.getHeight(),
+			    null);
+
+    // create new back buffer and clear it to the background color.
+    if (contents == BufferCapabilities.FlipContents.BACKGROUND)
+	{
+	  backBuffer = createVolatileImage(awtComponent.getWidth(),
+					   awtComponent.getHeight());
+	  backBuffer.getGraphics().clearRect(0, 0,
+					     awtComponent.getWidth(),
+					     awtComponent.getHeight());
+	}
+    // FIXME: support BufferCapabilities.FlipContents.PRIOR
   }
 
+  // Release the resources allocated to back buffers.
   public void destroyBuffers ()
   {
-    
+    backBuffer.flush();
   }
 }

libjava/gnu/java/awt/peer/gtk/GtkVolatileImage.java

@@ -0,0 +1,114 @@
+/* GtkVolatileImage.java -- a hardware-accelerated image buffer
+   Copyright (C) 2005  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.java.awt.peer.gtk;
+
+import java.awt.ImageCapabilities;
+import java.awt.image.VolatileImage;
+
+public class GtkVolatileImage extends VolatileImage
+{
+  private int width;
+  private int height;
+  private ImageCapabilities caps;
+
+  public GtkVolatileImage(int width, int height)
+  {
+    this(width, height, null);
+  }
+
+  public GtkVolatileImage(int width, int height, ImageCapabilities caps)
+  {
+    this.width = width;
+    this.height = height;
+    this.caps = caps;
+  }
+
+  // FIXME: should return a buffered image snapshot of the accelerated
+  // visual
+  public BufferedImage getSnapshot()
+  {
+    return null;
+  }
+
+  public int getWidth()
+  {
+    return width;
+  }
+
+  public int getHeight()
+  {
+    return height;
+  }
+
+  // FIXME: should return a graphics wrapper around this image's
+  // visual
+  public Graphics2D createGraphics()
+  {
+    return null;
+  }
+
+  public int validate(GraphicsConfiguration gc)
+  {
+    return VolatileImage.IMAGE_OK;
+  }
+
+  public boolean contentsLost()
+  {
+    return false;
+  }
+
+  public ImageCapabilities getCapabilities()
+  {
+    return caps;
+  }
+
+  public synchronized Object getProperty (String name, ImageObserver observer)
+  {
+    return null;
+  }
+
+  public synchronized int getWidth (ImageObserver observer)
+  {
+    return width;
+  }
+  
+  public synchronized int getHeight (ImageObserver observer)
+  {
+    return height;
+  }
+}