From 821504b32d119930016aad02940a398ca6cef13e Mon Sep 17 00:00:00 2001
From: fitzsim <fitzsim@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri, 6 May 2005 23:06:18 +0000
Subject: 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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@99336 138bc75d-0d04-0410-961f-82ee72b054a4
---
 .../gnu/java/awt/peer/gtk/GtkComponentPeer.java    | 54 +++++++++++++++++-----
 1 file changed, 43 insertions(+), 11 deletions(-)

(limited to 'libjava/gnu/java/awt/peer/gtk/GtkComponentPeer.java')

diff --git a/libjava/gnu/java/awt/peer/gtk/GtkComponentPeer.java b/libjava/gnu/java/awt/peer/gtk/GtkComponentPeer.java
index 2625f56a008..e3e7afb199e 100644
--- a/libjava/gnu/java/awt/peer/gtk/GtkComponentPeer.java
+++ b/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();
   }
 }
-- 
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