RE: How to use the GdkColor.pixel

["Tom Liu" <tom liu flextrade com>]

Thanks!, I understand now. 

But, how to get the rgb value of a allocated color? In my application, I
allocated a lot of color when I start program, should I use RGB value?

How about for performance?  Every time to use GdkColor in GTK+,
internally it need to go alloc the color, will this slow down?




-----Original Message-----
From: gtk-app-devel-list-admin gnome org
[mailto:gtk-app-devel-list-admin gnome org] On Behalf Of Owen Taylor
Sent: Thursday, December 11, 2003 11:53 AM
To: Tom Liu
Cc: gtk-app-devel-list gnome org
Subject: Re: How to use the GdkColor.pixel

On Thu, 2003-12-11 at 11:02, Tom Liu wrote:
> I use the gdk_color_alloc to get the pixel for a color. 
> When I use the pixel to set the color, it doesn't work, 
> When I just set red,green,blue, it will work.
>
>         GdkColormap* sysmap=gdk_colormap_get_system();
>         GdkColor color;
>         if (gdk_color_parse   ("#FF0000",&color)) {
>                 gdk_color_alloc (sysmap,&color) ;
>         }
>         color.red=0;color.blue=0;color.green=0;
>         printf("color:%d\n",color.pixel);
>         gtk_widget_modify_bg(widg,GTK_STATE_NORMAL,&color);
>
> looks color.pixel is useless, is that true?

General rule (with a few exceptions is):

 GTK+ functions take unallocated colors
 GDK functions take allocated colors 

An unallocated color means that the 'pixel' field is unused
and will be determined by GTK+.

E.g., the docs for gtk_widget_modify_bg say:

 * @color: the color to assign (does not need to be allocated),
 *         or %NULL to undo the effect of previous calls to
 *         of gtk_widget_modify_bg().

Regards,
                                                Owen


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