Eclipse: table column image transparent or not? - eclipse

Question

Once I start drawing my own images in an Eclipse table cell, highlighting that table cell results in a strange highlight color. See for yourself:
While the transparency is actually preserved like in the first column, the highlight-blue isn't as blue as it should. Is this my fault or Eclipse's fault?
Here's the code snippet:
public class TransparentOrNot {
public static void main(String[] args) {
Display firstDisplay = new Display();
Shell firstShell = new Shell(firstDisplay);
firstShell.setText("Transparent-or-not!");
firstShell.setSize(300, 200);
firstShell.setLayout(new FillLayout());
TableViewer viewer = new TableViewer(firstShell, SWT.MULTI);
viewer.getTable().setLinesVisible(true);
viewer.getTable().setHeaderVisible(true);
TableViewerColumn tableViewerColumn = new TableViewerColumn(viewer, SWT.CENTER);
tableViewerColumn.getColumn().setText("First");
tableViewerColumn.getColumn().setWidth(150);
tableViewerColumn.setLabelProvider(new ColumnLabelProvider() {
#Override
public Image getImage(Object element) {
return ImageDescriptor.createFromFile(TransparentOrNot.class, "/red.png").createImage();
}
#Override
public String getText(Object element) {
return null;
}
});
tableViewerColumn = new TableViewerColumn(viewer, SWT.CENTER);
tableViewerColumn.getColumn().setText("Second");
tableViewerColumn.getColumn().setWidth(150);
tableViewerColumn.setLabelProvider(new CenterImageLabelProvider());
viewer.setContentProvider(ArrayContentProvider.getInstance());
viewer.setInput(new String[][]{{"a", "b"}, {"c", "d"}});
firstShell.open();
while (!firstShell.isDisposed()) {
if (!firstDisplay.readAndDispatch()) {
firstDisplay.sleep();
}
}
firstDisplay.dispose();
}
static class CenterImageLabelProvider extends OwnerDrawLabelProvider {
#Override
protected void measure(Event event, Object element) {
// no-op
}
#Override
protected void paint(Event event, Object element) {
Image image = ImageDescriptor.createFromFile(TransparentOrNot.class, "/green.png").createImage();
Widget item = event.item;
Rectangle bounds = ((TableItem) item).getBounds(event.index);
Rectangle imgBounds = image.getBounds();
bounds.width /= 2;
bounds.width -= imgBounds.width / 2;
bounds.height /= 2;
bounds.height -= imgBounds.height / 2;
int x = bounds.width > 0 ? bounds.x + bounds.width : bounds.x;
int y = bounds.height > 0 ? bounds.y + bounds.height : bounds.y;
event.gc.drawImage(image, x, y);
}
}
}

Answer 1

Overriding erase() and not calling super.erase() helped.