--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/viewers/DecorationOverlayIcon.d	Mon Mar 31 00:47:19 2008 +0200
@@ -0,0 +1,198 @@
+/*******************************************************************************
+ * Copyright (c) 2006 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.jface.viewers.DecorationOverlayIcon;
+
+import dwtx.jface.viewers.IDecoration;
+import dwtx.jface.util.Util;
+
+// import tango.util.Arrays;
+
+import dwt.graphics.Image;
+import dwt.graphics.ImageData;
+import dwt.graphics.Point;
+import dwtx.jface.resource.CompositeImageDescriptor;
+import dwtx.jface.resource.ImageDescriptor;
+
+import dwt.dwthelper.utils;
+
+/**
+ * A <code>DecorationOverlayIcon</code> is an image descriptor that can be used
+ * to overlay decoration images on to the 4 corner quadrants of a base image.
+ * The four quadrants are {@link IDecoration#TOP_LEFT}, {@link IDecoration#TOP_RIGHT},
+ * {@link IDecoration#BOTTOM_LEFT} and {@link IDecoration#BOTTOM_RIGHT}. Additionally,
+ * the overlay can be used to provide an underlay corresponding to {@link IDecoration#UNDERLAY}.
+ *
+ * @since 3.3
+ * @see IDecoration
+ */
+public class DecorationOverlayIcon : CompositeImageDescriptor {
+
+    // the base image
+    private Image base;
+
+    // the overlay images
+    private ImageDescriptor[] overlays;
+
+    // the size
+    private Point size;
+
+    /**
+     * Create the decoration overlay for the base image using the array of
+     * provided overlays. The indices of the array correspond to the values
+     * of the 5 overlay constants defined on {@link IDecoration}
+     * ({@link IDecoration#TOP_LEFT}, {@link IDecoration#TOP_RIGHT},
+     * {@link IDecoration#BOTTOM_LEFT}, {@link IDecoration#BOTTOM_RIGHT}
+     * and{@link IDecoration#UNDERLAY}).
+     *
+     * @param baseImage the base image
+     * @param overlaysArray the overlay images
+     * @param sizeValue the size of the resulting image
+     */
+    public this(Image baseImage,
+            ImageDescriptor[] overlaysArray, Point sizeValue) {
+        this.base = baseImage;
+        this.overlays = overlaysArray;
+        this.size = sizeValue;
+    }
+
+    /**
+     * Create the decoration overlay for the base image using the array of
+     * provided overlays. The indices of the array correspond to the values
+     * of the 5 overlay constants defined on {@link IDecoration}
+     * ({@link IDecoration#TOP_LEFT}, {@link IDecoration#TOP_RIGHT},
+     * {@link IDecoration#BOTTOM_LEFT}, {@link IDecoration#BOTTOM_RIGHT}
+     * and {@link IDecoration#UNDERLAY}).
+     *
+     * @param baseImage the base image
+     * @param overlaysArray the overlay images
+     */
+    public this(Image baseImage, ImageDescriptor[] overlaysArray) {
+        this(baseImage, overlaysArray, new Point(baseImage.getBounds().width, baseImage.getBounds().height));
+    }
+
+    /**
+     * Create a decoration overlay icon that will place the given overlay icon in
+     * the given quadrant of the base image.
+     * @param baseImage the base image
+     * @param overlayImage the overlay image
+     * @param quadrant the quadrant (one of {@link IDecoration}
+     * ({@link IDecoration#TOP_LEFT}, {@link IDecoration#TOP_RIGHT},
+     * {@link IDecoration#BOTTOM_LEFT}, {@link IDecoration#BOTTOM_RIGHT}
+     * or {@link IDecoration#UNDERLAY})
+     */
+    public this(Image baseImage, ImageDescriptor overlayImage, int quadrant) {
+        this(baseImage, createArrayFrom(overlayImage, quadrant));
+    }
+
+    /**
+     * Convert the given image and quadrant into the proper input array.
+     * @param overlayImage the overlay image
+     * @param quadrant the quadrant
+     * @return an array with the given image in the proper quadrant
+     */
+    private static ImageDescriptor[] createArrayFrom(
+            ImageDescriptor overlayImage, int quadrant) {
+        ImageDescriptor[] descs = [ cast(ImageDescriptor) null, null, null, null, null ];
+        descs[quadrant] = overlayImage;
+        return descs;
+    }
+
+    /**
+     * Draw the overlays for the receiver.
+     * @param overlaysArray
+     */
+    private void drawOverlays(ImageDescriptor[] overlaysArray) {
+
+        for (int i = 0; i < overlays.length; i++) {
+            ImageDescriptor overlay = overlaysArray[i];
+            if (overlay is null) {
+                continue;
+            }
+            ImageData overlayData = overlay.getImageData();
+            //Use the missing descriptor if it is not there.
+            if (overlayData is null) {
+                overlayData = ImageDescriptor.getMissingImageDescriptor()
+                        .getImageData();
+            }
+            switch (i) {
+            case IDecoration.TOP_LEFT:
+                drawImage(overlayData, 0, 0);
+                break;
+            case IDecoration.TOP_RIGHT:
+                drawImage(overlayData, size.x - overlayData.width, 0);
+                break;
+            case IDecoration.BOTTOM_LEFT:
+                drawImage(overlayData, 0, size.y - overlayData.height);
+                break;
+            case IDecoration.BOTTOM_RIGHT:
+                drawImage(overlayData, size.x - overlayData.width, size.y
+                        - overlayData.height);
+                break;
+            }
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see java.lang.Object#equals(java.lang.Object)
+     */
+    public override int opEquals(Object o) {
+        if (!( cast(DecorationOverlayIcon)o )) {
+            return false;
+        }
+        DecorationOverlayIcon other = cast(DecorationOverlayIcon) o;
+        return base.opEquals(other.base)
+                && Util.opEquals(overlays, other.overlays);
+    }
+
+    /* (non-Javadoc)
+     * @see java.lang.Object#hashCode()
+     */
+    public override hash_t toHash() {
+        int code = base.toHash();
+        for (int i = 0; i < overlays.length; i++) {
+            if (overlays[i] !is null) {
+                code ^= overlays[i].toHash();
+            }
+        }
+        return code;
+    }
+
+    /* (non-Javadoc)
+     * @see dwtx.jface.resource.CompositeImageDescriptor#drawCompositeImage(int, int)
+     */
+    protected void drawCompositeImage(int width, int height) {
+        if (overlays.length > IDecoration.UNDERLAY) {
+            ImageDescriptor underlay = overlays[IDecoration.UNDERLAY];
+            if (underlay !is null) {
+                drawImage(underlay.getImageData(), 0, 0);
+            }
+        }
+        drawImage(base.getImageData(), 0, 0);
+        drawOverlays(overlays);
+    }
+
+    /* (non-Javadoc)
+     * @see dwtx.jface.resource.CompositeImageDescriptor#getSize()
+     */
+    protected Point getSize() {
+        return size;
+    }
+
+    /* (non-Javadoc)
+     * @see dwtx.jface.resource.CompositeImageDescriptor#getTransparentPixel()
+     */
+    protected int getTransparentPixel() {
+        return base.getImageData().transparentPixel;
+    }
+
+}