Re: Circular definition of draw_segments

[James Henstridge <james jamesh id au>]

On 15/12/04 16:02, Russell Shaw wrote:

> Hi,
> I can't find where gdk_draw_segments() eventually calls an X line
> drawing function. Starting from here, the path seems to go in circles:
>
> static void
> gdk_window_draw_segments (GdkDrawable *drawable,
>                           GdkGC       *gc,
>                           GdkSegment  *segs,
>                           gint         nsegs)
> {
>   ...
>   gdk_draw_segments (paint->pixmap, gc, new_segs, nsegs);

^^^^ note here that gdk_window_draw_segments() is drawing to a 
GdkPixmap.  This is part of GTK's double buffering (in the no-double 
buffering case, it will call draw_segments on ->impl, which is a 
GdkWindowImplX11 class on X11).

The GdkPixmap draw_segments() implementation also chains to the ->impl 
class (which is a GdkPixmapImplX11 class on X11).

Both the impl classes derive from GdkDrawableImplX11, so you'll find the 
actual X calls in the gdk_x11_draw_segments() function from 
gdk/x11/gdkdrawable-x11.c.

James.

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