--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/draw2d/BufferedGraphicsSource.d	Sun Aug 03 00:52:14 2008 +0200
@@ -0,0 +1,149 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2005 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.draw2d.BufferedGraphicsSource;
+
+import dwt.dwthelper.utils;
+
+
+
+import dwt.DWT;
+import dwt.DWTError;
+import dwt.graphics.GC;
+import dwt.graphics.Image;
+static import dwt.graphics.Point;
+import dwt.widgets.Canvas;
+import dwt.widgets.Caret;
+import dwt.widgets.Control;
+import dwtx.draw2d.geometry.Rectangle;
+import dwtx.draw2d.GraphicsSource;
+import dwtx.draw2d.Graphics;
+import dwtx.draw2d.SWTGraphics;
+
+class BufferedGraphicsSource : GraphicsSource {
+
+private Image imageBuffer;
+private GC imageGC;
+private GC controlGC;
+private Control control;
+private Rectangle inUse;
+
+/**
+ * Constructs a new buffered graphics source using the given control.
+ * @since 2.1
+ * @param c the control
+ */
+public this(Control c) {
+    control = c;
+}
+
+/**
+ * @see dwtx.draw2d.GraphicsSource#flushGraphics(dwtx.draw2d.geometry.Rectangle)
+ */
+public void flushGraphics(Rectangle region) {
+    if (inUse.isEmpty())
+        return;
+
+    bool restoreCaret = false;
+    Canvas canvas = null;
+    if (auto canvas = cast(Canvas)control ) {
+        Caret caret = canvas.getCaret();
+        if (caret !is null)
+            restoreCaret = caret.isVisible();
+        if (restoreCaret)
+            caret.setVisible(false);
+    }
+    /*
+     * The imageBuffer may be null if double-buffering was not successful.
+     */
+    if (imageBuffer !is null) {
+        imageGC.dispose();
+        controlGC.drawImage(getImage(),
+                0, 0, inUse.width, inUse.height,
+                inUse.x, inUse.y, inUse.width, inUse.height);
+        imageBuffer.dispose();
+        imageBuffer = null;
+        imageGC = null;
+    }
+    controlGC.dispose();
+    controlGC = null;
+
+    if (restoreCaret)
+        canvas.getCaret().setVisible(true);
+}
+
+/**
+ * @see dwtx.draw2d.GraphicsSource#getGraphics(dwtx.draw2d.geometry.Rectangle)
+ */
+public Graphics getGraphics(Rectangle region) {
+    if (control is null || control.isDisposed())
+        return null;
+
+    dwt.graphics.Point.Point ptSWT = control.getSize();
+    inUse = new Rectangle(0, 0, ptSWT.x, ptSWT.y);
+    inUse.intersect(region);
+    if (inUse.isEmpty())
+        return null;
+
+    /*
+     * Bugzilla 53632 - Attempts to create large images on some platforms will fail.
+     * When this happens, do not use double-buffering for painting.
+     */
+    try {
+        imageBuffer = new Image(null, inUse.width, inUse.height);
+    } catch (DWTError noMoreHandles) {
+        imageBuffer = null;
+    } catch (IllegalArgumentException tooBig) {
+        imageBuffer = null;
+    }
+
+    controlGC = new GC(control,
+            control.getStyle() & (DWT.RIGHT_TO_LEFT | DWT.LEFT_TO_RIGHT));
+    Graphics graphics;
+    if (imageBuffer !is null) {
+        imageGC = new GC(imageBuffer,
+                control.getStyle() & (DWT.RIGHT_TO_LEFT | DWT.LEFT_TO_RIGHT));
+        imageGC.setBackground(controlGC.getBackground());
+        imageGC.setForeground(controlGC.getForeground());
+        imageGC.setFont(controlGC.getFont());
+        imageGC.setLineStyle(controlGC.getLineStyle());
+        imageGC.setLineWidth(controlGC.getLineWidth());
+        imageGC.setXORMode(controlGC.getXORMode());
+        graphics = new SWTGraphics(imageGC);
+        graphics.translate(inUse.getLocation().negate());
+    } else {
+        graphics = new SWTGraphics(controlGC);
+    }
+
+    graphics.setClip(inUse);
+    return graphics;
+}
+
+/**
+ * Returns the current image buffer or <code>null</code>.
+ * @since 2.1
+ * @return the current image buffer
+ */
+protected Image getImage() {
+    return imageBuffer;
+}
+
+/**
+ * Returns the current GC used on the buffer or <code>null</code>.
+ * @since 2.1
+ * @return the GC for the image buffer
+ */
+protected GC getImageGC() {
+    return imageGC;
+}
+
+}