Re: gdk_draw_layout with GDK_XOR

["David Necas (Yeti)" <yeti physics muni cz>]

On Fri, Oct 15, 2004 at 01:42:09AM +0200, David Necas (Yeti) wrote:
> 
> Does gdk_draw_layout() allow to achieve the same effect as
> [long deprecated] gdk_draw_string() + GDK_XOR GC function?
> It seems gdk_draw_layout() always simply draws the text
> over, no matter what GC function I set.

Well, here's what I need -- maybe there's other way to
achieve it:

I need to draw identifiers to some kinds of selections (may
be lines, crosses, ...) on an unpredictable varying
background, which is actually a display of some data.  So
I'd like
- visibility on varying backgrounds
- obscuring as little of the underlying bg as possible
- ease of undrawing
- portability

gdk_draw_string() with GDK_XOR/GDK_INVERT has first three
properties, but requires some backend-dependent font
guesswork and it is deprecated so I wonder whether it will
survive to Gtk+3.0...

I'm unable to get anything else than portability from
gdk_draw_layout(), that is useless in itself.

It should be possible to draw the text to an offscreen
drawable and then draw that with GDK_XOR.  But how do I get
rid of antialiasing (that don't work well with XOR)?

Yeti


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