RE: How to redraw the application window of a multithreaded GTK a pp?

[CAVEY GERARD <GERARD CAVEY sgam com>]

hello
maybe that doing a gdk_window_clear(MyDrawingArea->window);
could work; just try to put it just after the call to
gdk_window_set_back_pixmap()
(of course replace "MyDrawingArea" by ur drawingarea name after casting it
to GtKWidget*)
it should force the page flipping ,and reveal ur back buffer content
 i guess it will work

ps: sorry if my english is so bad

regards

-----Message d'origine-----
De : Joerg Vogler [mailto:vogler panasonic de]
Envoyé : mercredi 25 septembre 2002 18:54
À : Olexiy Avramchenko
Cc : GTK Mailing List
Objet : RE: How to redraw the application window of a multithreaded GTK
app?


> From: Olexiy Avramchenko [mailto:ath beast stu cn ua]
> Sent: Wednesday, September 25, 2002 12:05 PM
>
> 1. Under the X you can use XShm shared pixmap. You can read/write
> its memory
> like an image's memory but its faster to draw it.
> 2. gdk_widget_queue_draw() is not the best way to update the screen in
> your case.
> You have to directly call gdk_draw_* in drawing thread (dont forget to
> call gdk_flush()
> to sync X server).
> 3. Set the shared pixmap as the background of the drawing area window to
> avoid
> handling "expose" event manually. There was a big thread "drawing
> graphics"
> (09.19.2001) about.

I have checked the example scribble_simple, which was mentioned in one of
the mails in the thread "drawing graphics". It works well on my PC. But it
doesn't call gdk_window_set_back_pixmap().

So I modified scribble_simple in order to use the pixmap as a back pixmap. I
called gdk_window_set_back_pixmap() in configure_event(), and I removed
gtk_signal_connect(..., "expose_event", ...) in main().

If I understood all explanations discussed in this mailing list right, I
would expect that the back pixmap refreshes the drawing area automatically
without having an expose_event handler implemented in the application. But
nothing happens when I click into the drawing area of scribble_simple.

But if I hide the scribble_simple window and reveal it again, it shows the
black rectangles drawn to the pixmap by draw_brush().

I'm not sure if it is relevant: I use X-Manager for remote login to the
Linux PC, and I have GTK+ 1.2 installed.

Any idea about that problem?

Joerg

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