Reinitializing image with image data after post process

Author: ShahzaibIbrahim

bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/graphics/ImageGcDrawer.java

@@ -45,6 +45,7 @@ public interface ImageGcDrawer {
 	 * @param imageData The resulting ImageData after <code>drawOn</code> was called
 	 */
 	default void postProcess(ImageData imageData) {
+		imageData.data = null;
 	}
 
 	/**

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/Image.java

@@ -2561,6 +2561,10 @@ protected ImageHandle newImageHandle(int zoom) {
 			drawer.drawOn(gc, width, height);
 			ImageData imageData = Image.this.getImageMetadata(zoom).getImageData();
 			drawer.postProcess(imageData);
+			if(imageData.data != null) {
+				zoomLevelToImageHandle.get(zoom).destroy();
+				init(imageData, zoom);
+			}
 			return zoomLevelToImageHandle.get(zoom);
 		} finally {
 			gc.dispose();