muppet <[EMAIL PROTECTED]> writes:
>
> $gc->set_function ('xor');
> $gc->set_foreground ($widget->style->white);
I think that can flip a 0 pixel (which is probably black) to become
white, and then back again, but for a different background I think it
has to be something like
my $fgcolor = $widget->style->fg('normal');
my $bgcolor = $widget->style->bg('normal');
my $mycolor = Gtk2::Gdk::Color->new;
$mycolor->set_pixel ($fgcolor->pixel ^ $bgcolor->pixel);
$gc->set_foreground ($mycolor);
Ie. for xors or other crazy GCFunction operations I think the GdkColor
is not a colour, just a way to pass a pixel value with the bits you want
to flip or set or whatever.
(I imagine apart from xors most such things are only really useful for a
pseudocolor where you've setup particular colours in particular pixels
of the colormap. Maybe on a truecolor you could OR in some extra red on
top of other drawing, or something like that though.)
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