Re: [gtk-list] Re: Help with GtkColor

[Adrian Feiguin <feiguin ifir ifir edu ar>]

On Thu, 20 May 1999, [iso-8859-1] José Miguel R. Barrientos wrote:

> Justin Zaun wrote:
> > 
> > Justin Zaun wrote:
> > >
> > > How do I convert a GtkColor into an XPixel? It is very important that the
> > > colors match exactly, and it must work in all color depths. Any help will
> > > be very appreciated.
> > >         Justin
> > >
> > > --
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> > /dev/null
> > 
> > XColor and GdkColor, both have red, green and blue fields, and are
> > identical.
> > 
> > Not real up on X, but the function I'm calling is expecting a XPixel color
> > a number from 0-12345 (or some number, can't remember right now). Its the
> > acual color of the pixel, not the RGB values... This value is neaded to be
> > sent directly to the tuner hardware...
> >         Thanks,
> >           Justin
> 
> 
> Ok, the pixel value is an index into a ColorMap. GdkColorMap and XColorMap have
> the same entries.
> Any operation involving color in Gdk must manage a ColorMap. This colormap
> matches the X colormap.
> 
> 
> Regards,
> 
> 		- José Miguel

Just let me add that you can set the pixel value using 
gdk_color_alloc(colormap, &color)
for example : gdk_color_alloc(gtk_widget_get_colormap(widget), &color)
this looks for the best match in the given colormap.
you can set rgb values by hand, or with gdk_color_parse.
Regards,
<ADRIAN>
> 
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