Re: XOR, was : Drawing text into a drawing area with Pango

[Owen Taylor <otaylor redhat com>]

On Wed, 2004-02-18 at 08:06, Bryan Brown wrote:

> The gc has its function set to GDK_XOR for the ghosting, and it's then set
> to GDK_COPY for the final stamping into the drawing area.  This worked
> fine with gtk 1.2.  With 2.x and the above layout approach, however, the
> XOR-ing isn't happening ... the text is being stamped into the background
> with the mouse motion, leaving a swath of text all over the drawing area.
>
> Any suggestions for how to do the ghosting with pango?  I thought using
> the GDK_XOR function in the gc would do it, but it doesn't seem to.

GTK+-2.x typically is using anti-aliasing to draw text, and XOR simply
isn't a meaningful operation for anti-aliased text. So you'll probably
have to switch to actually redrawing to clear the previous text
position.

Regards,
                                                Owen