--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.jface/src/org/eclipse/jface/resource/CompositeImageDescriptor.d	Sat Mar 14 18:23:29 2009 +0100
@@ -0,0 +1,219 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2007 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 org.eclipse.jface.resource.CompositeImageDescriptor;
+
+import org.eclipse.jface.resource.ImageDescriptor;
+
+import org.eclipse.swt.graphics.ImageData;
+import org.eclipse.swt.graphics.PaletteData;
+import org.eclipse.swt.graphics.Point;
+import org.eclipse.swt.graphics.RGB;
+
+import java.lang.all;
+import java.util.Set;
+
+/**
+ * Abstract base class for image descriptors that synthesize an image from other
+ * images in order to simulate the effect of custom drawing. For example, this
+ * could be used to superimpose a red bar dexter symbol across an image to
+ * indicate that something was disallowed.
+ * <p>
+ * Subclasses must implement the <code>getSize</code> and <code>fill</code>
+ * methods. Little or no work happens until the image descriptor's image is
+ * actually requested by a call to <code>createImage</code> (or to
+ * <code>getImageData</code> directly).
+ * </p>
+ */
+public abstract class CompositeImageDescriptor : ImageDescriptor {
+
+    /**
+     * The image data for this composite image.
+     */
+    private ImageData imageData;
+
+    /**
+     * Constructs an uninitialized composite image.
+     */
+    protected this() {
+    }
+
+    /**
+     * Draw the composite images.
+     * <p>
+     * Subclasses must implement this framework method to paint images within
+     * the given bounds using one or more calls to the <code>drawImage</code>
+     * framework method.
+     * </p>
+     *
+     * @param width
+     *            the width
+     * @param height
+     *            the height
+     */
+    protected abstract void drawCompositeImage(int width, int height);
+
+    /**
+     * Draws the given source image data into this composite image at the given
+     * position.
+     * <p>
+     * Call this internal framework method to superimpose another image atop
+     * this composite image.
+     * </p>
+     *
+     * @param src
+     *            the source image data
+     * @param ox
+     *            the x position
+     * @param oy
+     *            the y position
+     */
+    final protected void drawImage(ImageData src, int ox, int oy) {
+        ImageData dst = imageData;
+        PaletteData srcPalette = src.palette;
+        ImageData srcMask = null;
+        int alphaMask = 0, alphaShift = 0;
+        if (src.maskData !is null) {
+            srcMask = src.getTransparencyMask ();
+            if (src.depth is 32) {
+                alphaMask = ~(srcPalette.redMask | srcPalette.greenMask | srcPalette.blueMask);
+                while (alphaMask !is 0 && ((alphaMask >>> alphaShift) & 1) is 0) alphaShift++;
+            }
+        }
+        for (int srcY = 0, dstY = srcY + oy; srcY < src.height; srcY++, dstY++) {
+            for (int srcX = 0, dstX = srcX + ox; srcX < src.width; srcX++, dstX++) {
+                if (!(0 <= dstX && dstX < dst.width && 0 <= dstY && dstY < dst.height)) continue;
+                int srcPixel = src.getPixel(srcX, srcY);
+                int srcAlpha = 255;
+                if (src.maskData !is null) {
+                    if (src.depth is 32) {
+                        srcAlpha = (srcPixel & alphaMask) >>> alphaShift;
+                        if (srcAlpha is 0) {
+                            srcAlpha = srcMask.getPixel(srcX, srcY) !is 0 ? 255 : 0;
+                        }
+                    } else {
+                        if (srcMask.getPixel(srcX, srcY) is 0) srcAlpha = 0;
+                    }
+                } else if (src.transparentPixel !is -1) {
+                    if (src.transparentPixel is srcPixel) srcAlpha = 0;
+                } else if (src.alpha !is -1) {
+                    srcAlpha = src.alpha;
+                } else if (src.alphaData !is null) {
+                    srcAlpha = src.getAlpha(srcX, srcY);
+                }
+                if (srcAlpha is 0) continue;
+                int srcRed, srcGreen, srcBlue;
+                if (srcPalette.isDirect) {
+                    srcRed = srcPixel & srcPalette.redMask;
+                    srcRed = (srcPalette.redShift < 0) ? srcRed >>> -srcPalette.redShift : srcRed << srcPalette.redShift;
+                    srcGreen = srcPixel & srcPalette.greenMask;
+                    srcGreen = (srcPalette.greenShift < 0) ? srcGreen >>> -srcPalette.greenShift : srcGreen << srcPalette.greenShift;
+                    srcBlue = srcPixel & srcPalette.blueMask;
+                    srcBlue = (srcPalette.blueShift < 0) ? srcBlue >>> -srcPalette.blueShift : srcBlue << srcPalette.blueShift;
+                } else {
+                    RGB rgb = srcPalette.getRGB(srcPixel);
+                    srcRed = rgb.red;
+                    srcGreen = rgb.green;
+                    srcBlue = rgb.blue;
+                }
+                int dstRed, dstGreen, dstBlue, dstAlpha;
+                if (srcAlpha is 255) {
+                    dstRed = srcRed;
+                    dstGreen = srcGreen;
+                    dstBlue= srcBlue;
+                    dstAlpha = srcAlpha;
+                } else {
+                    int dstPixel = dst.getPixel(dstX, dstY);
+                    dstAlpha = dst.getAlpha(dstX, dstY);
+                    dstRed = (dstPixel & 0xFF) >>> 0;
+                    dstGreen = (dstPixel & 0xFF00) >>> 8;
+                    dstBlue = (dstPixel & 0xFF0000) >>> 16;
+                    dstRed += (srcRed - dstRed) * srcAlpha / 255;
+                    dstGreen += (srcGreen - dstGreen) * srcAlpha / 255;
+                    dstBlue += (srcBlue - dstBlue) * srcAlpha / 255;
+                    dstAlpha += (srcAlpha - dstAlpha) * srcAlpha / 255;
+                }
+                dst.setPixel(dstX, dstY, ((dstRed & 0xFF) << 0) | ((dstGreen & 0xFF) << 8) | ((dstBlue & 0xFF) << 16));
+                dst.setAlpha(dstX, dstY, dstAlpha);
+            }
+        }
+    }
+
+    /*
+     * (non-Javadoc) Method declared on ImageDesciptor.
+     */
+    public override ImageData getImageData() {
+        Point size = getSize();
+
+        /* Create a 24 bit image data with alpha channel */
+        imageData = new ImageData(size.x, size.y, 24, new PaletteData(0xFF, 0xFF00, 0xFF0000));
+        imageData.alphaData = new byte[imageData.width * imageData.height];
+
+        drawCompositeImage(size.x, size.y);
+
+        /* Detect minimum transparency */
+        bool transparency = false;
+        byte[] alphaData = imageData.alphaData;
+        for (int i = 0; i < alphaData.length; i++) {
+            int alpha = alphaData[i] & 0xFF;
+            if (!(alpha is 0 || alpha is 255)) {
+                /* Full alpha channel transparency */
+                return imageData;
+            }
+            if (!transparency && alpha is 0) transparency = true;
+        }
+        if (transparency) {
+            /* Reduce to 1-bit alpha channel transparency */
+            PaletteData palette = new PaletteData([new RGB(0, 0, 0), new RGB(255, 255, 255)]);
+            ImageData mask = new ImageData(imageData.width, imageData.height, 1, palette);
+            for (int y = 0; y < mask.height; y++) {
+                for (int x = 0; x < mask.width; x++) {
+                    mask.setPixel(x, y, imageData.getAlpha(x, y) is 255 ? 1 : 0);
+                }
+            }
+        } else {
+            /* no transparency */
+            imageData.alphaData = null;
+        }
+        return imageData;
+    }
+
+
+    /**
+     * Return the transparent pixel for the receiver.
+     * <strong>NOTE</strong> This value is not currently in use in the
+     * default implementation.
+     * @return int
+     * @since 3.3
+     */
+    protected int getTransparentPixel() {
+        return 0;
+    }
+
+    /**
+     * Return the size of this composite image.
+     * <p>
+     * Subclasses must implement this framework method.
+     * </p>
+     *
+     * @return the x and y size of the image expressed as a point object
+     */
+    protected abstract Point getSize();
+
+    /**
+     * @param imageData The imageData to set.
+     * @since 3.3
+     */
+    protected void setImageData(ImageData imageData) {
+        this.imageData = imageData;
+    }
+}