Re: Text rendering with pango and gtkpixbuf (Gonzalo Aguilar Delgado)

[Gonzalo Aguilar Delgado <gad aguilardelgado com>]

Not enough luck!!!

Don't know what is the problem because the map I draw uses 8bit depth.
But the colormap is RGB so PANGO or GDK_GC should do the work...

I don't know if I have to set up colors used in pango-rendering-text
functions on my gc but nothing I tried works...

The question is:

        Must I do something special with pango to render text with colors on a
GDK_DRAWABLE?


This is what I currently do:

----------------------------- Cut Here ---------------------
...
GdkColor fore = { 255, 0, 0, 0x00 };
...
playout =   gtk_widget_create_pango_layout(GTK_WIDGET (map),"Hello");
pfontdesc = pango_font_description_from_string ("Sans 8");
pango_layout_set_font_description (playout, pfontdesc);
pango_layout_get_pixel_size (playout, &text_width, &text_height);

patcolor = pango_attr_foreground_new(255,0,0);
pattrlist = pango_layout_get_attributes(playout);
if(pattrlist) {
        pango_attr_list_insert(pattrlist,patcolor);
}else{
        pattrlist=pango_attr_list_new();
        pango_attr_list_insert(pattrlist,patcolor);
}
        
pango_layout_set_attributes(playout,pattrlist);

Gc = gdk_gc_new(GTK_WIDGET (map)->window);

if(!gdk_colormap_alloc_color(gdk_rgb_get_cmap (),&fore,TRUE,TRUE)){
        g_print("No color allocated\n"); /* Thanks to Kaesar */
}
                       
        
gdk_draw_layout_with_colors(GTK_WIDGET(map)->window,
        Gc,(gint)winx-(text_width/2),
        (gint)(winy-(text_height/2)),playout,&fore,NULL);

gdk_gc_unref(Gc);
g_object_unref(G_OBJECT(playout));
pango_font_description_free(pfontdesc);
pango_attribute_destroy(patcolor);
------------------------------ CUT HERE -------------------------

But this leads to a colored 8 bit map on the back and a black text on
the front and NO ERRORS!!!
        


> You need allocate the color before use it.
> You can try:
> ...
> Gc = gdk_gc_new(GTK_WIDGET (map)->window);
>
> /*BEGIN NEW*/
>
> /*View:
> http://developer.gnome.org/doc/API/2.0/gdk/gdk-Colormaps-and-Colors.html*/
> if (!gdk_colormap_alloc_color(
>          gdk_colormap_get_system (),
>          &fore, TRUE, TRUE)
>    ) {/*ERROR: NO gdk_colormap_alloc_color*/}
>
> /*END NEW*/
>
> /* I use this because without colors does not work,
> nor with this... */   
> gdk_draw_layout_with_colors(GTK_WIDGET(map)->window,Gc,(gint)winx,(gint)winy,
> playout,&fore,NULL);
> ...
>
>
> Lucky!
>
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-- 
--
Ingeniero en Informatica
Gonzalo Aguilar Delgado <a
href="gad aguilardelgado com">gad aguilardelgado com</a>