[webkit-dev] help with porting

Luka Napotnik luka.napotnik at gmail.com
Fri May 23 06:28:04 PDT 2008 

Hm I see they made their own "widget" for clutter. It seems modifying
the gobject class so it would be inherited form GdkPixmap should do the
trick. I'll play with this for a while. Still it would be great for a
clean cairo port without X. I'll investigate that later.

Greets,
Luka

Dne 23.05.2008 (pet) ob 14:11 +0200 je Julien Sanchez zapisal(a):
> Hello Luka,
> 
> I used the following path from clutter repository:
> http://svn.o-hand.com/view/clutter/trunk/clutter-webkit/webkit-frame-show-cairo.patch?rev=2031&view=markup
> 
> As a rough prototype, I adapted an "OffscreenWebkit" class inspired from
> the ClutterWebkitClass from clutter-webkit
> (http://svn.o-hand.com/view/clutter/trunk/clutter-webkit/clutter-webkit.c?rev=2030&view=markup)
> 
> and more especially in load_finished_cb:
> 
> static void load_finished_cb (WebKitWebView  *web_view,
> 		  WebKitWebFrame *frame,
> 		  OffscreenWebkit  *webkit)
> {
> 	g_print ("load_finished_cb\n");
> 	OffscreenWebkitPrivate *priv = OFFSCREEN_WEBKIT_GET_PRIVATE(webkit);
> 	cairo_surface_t *surf = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
> priv->width, priv->height);
> 	cairo_t* cr_surf = cairo_create(surf);
> 	cairo_rectangle (cr_surf, 0, 0, priv->width, priv->height);
> 	webkit_web_frame_show (frame, cr_surf);
> 	cairo_surface_write_to_png(surf, "webkitsurf.png");
> 	cairo_surface_destroy(surf);
> 	
> 	surf =
> cairo_pdf_surface_create("webkitsurf.pdf", priv->width, priv->height);
> 	cr_surf = cairo_create(surf);
> 	cairo_rectangle (cr_surf, 0, 0, priv->width, priv->height);
> 	webkit_web_frame_show (frame, cr_surf);	
> 	cairo_surface_show_page(surf);
> 	
> 	cairo_surface_finish(surf);
> 	cairo_surface_destroy(surf);
> 	
> 	g_main_loop_quit(loop);
> }
> 
> It works but I wonder if it is possible to to the same without an X
> server (I just tried with the gtk-directfb port :./configure
> --enable-debug --with-target=directfb but it does not work. I don't know
> how to use directfb and if it will be efficient.
> 
> Julien
> 
> Le vendredi 23 mai 2008 à 13:32 +0200, Luka Napotnik a écrit :
> > Hello Julien.
> > 
> > So you didn't draw the webkitview widget at all but stil managed to get
> > a cairo drawing from the engine? If so, could you please tell me how did
> > you do that?
> > 
> > Greets,
> > Luka
> > 
> > Dne 23.05.2008 (pet) ob 12:58 +0200 je Julien Sanchez zapisal(a):
> > > Hello,
> > > 
> > > I'm interested too in such a port because I'm trying to render simple
> > > html (no plugins or widgets) into image and pdf backends.
> > > For the moment, I made a simple hack (inspired from Clutter project) to
> > > render into a cairo surface. It works from the command line but it still
> > > depends from X (and GTK) and I don't know where to begin to get rid of
> > > these dependencies.
> > > 
> > > Julien
> > > 
> > > Le jeudi 22 mai 2008 à 09:30 -0700, Mike Emmel a écrit :
> > > > Luka I don't think it makes a difference if your running a lot of
> > > > thumbnails you would want to use gpu's some sort of render
> > > > farm arrangement.  My port does it as a result of the design not
> > > > because of a strong desire to render with the cpu.
> > > > Also for real world web pages your going to have problems with plugins
> > > > which depend on X11 and native widget libraries.
> > > > 
> > > > So although its possible with my port I can't see a single real
> > > > problem that can be solved with this approach.
> > > > Gtk/DirectFB will work for most pages if you have a flash port. Thats
> > > > the number one stumbling block.
> > > > I did my headless version of DirectFB for example to use the DirectFB
> > > > video provider for the media tags.
> > > > You can take other approaches but you would need to consider at a
> > > > minimum flash and the media tags.
> > > > For complete font support your going to have to use pango or go with
> > > > the QT port but the QT port gets you back
> > > > to the plugin issues if you don't use X11 and a lot of plugins use GTK so....
> > > > 
> > > > 
> > > > As far as releasing I'm not in control of the release cycle except for
> > > > creating delays as I work on stuff :(
> > > > It should be released however some time this year.
> > > > 
> > > > I obviously don't disagree with your idea in fact I worked hard to
> > > > ensure my approach was adaptable so it could be used for these types
> > > > of use cases so someday we will have what your looking for if things
> > > > go well. I actually designed it to work
> > > > with all the legacy use cases I mentioned but be flexible enough to
> > > > transparently drop them when replacements without the legacy X11/Gtk
> > > > dependencies become available. So soon a framework will be available
> > > > to allow you to reverse software
> > > > bloat but I've got no idea if software developers will accept it. I
> > > > built it to deal with the problems that occur with our new embedded
> > > > devices that have capabilities rivaling desktops where bloat is a huge
> > > > problem. The fact it can do what your asking makes me confident the
> > > > design is correct in fact it solves problems your not considering.
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > On Thu, May 22, 2008 at 8:41 AM, Luka Napotnik <luka.napotnik at gmail.com> wrote:
> > > > > Wow really? Could you share the port please. I've been looking for such
> > > > > a port to save the cairo painting to a PNG image.
> > > > >
> > > > > Greets,
> > > > > Luka
> > > > >
> > > > > Dne 22.05.2008 (čet) ob 07:41 -0700 je Mike Emmel zapisal(a):
> > > > >> I actually have a WebKit port with no dependencies but Cairo.
> > > > >>
> > > > >>
> > > > >>
> > > > >> On Thu, May 22, 2008 at 7:02 AM, Luka Napotnik <luka.napotnik at gmail.com> wrote:
> > > > >> > Hello Mike.
> > > > >> >
> > > > >> > What I need is a WebKit port that is independent of any display server
> > > > >> > (X or a framebuffer). I only want to render the page to an image. And
> > > > >> > since cairo is a great graphics library I think It's a good start.
> > > > >> >
> > > > >> > Greets,
> > > > >> > Luka
> > > > >> >
> > > > >> > Dne 22.05.2008 (čet) ob 06:49 -0700 je Mike Emmel zapisal(a):
> > > > >> >> Use the GTK DirectFB backend.
> > > > >> >>
> > > > >> >> I have a memory only system that I really need to get into the trunk.
> > > > >> >> But if you have a graphics card in the system the fb0 will work.
> > > > >> >>
> > > > >> >> Its on my TODO to get the mem only system checked in and I can give
> > > > >> >> you a patch in the mean time if its a issue. Also you can use the vnc driver
> > > > >> >> as a virtual framebuffer.
> > > > >> >>
> > > > >> >> Also some of the XServers should work in a similar way so you can probably
> > > > >> >> play the same trick with the right X11 server.
> > > > >> >>
> > > > >> >>
> > > > >> >> On Thu, May 22, 2008 at 4:21 AM, Luka Napotnik <luka.napotnik at gmail.com> wrote:
> > > > >> >> > Hello.
> > > > >> >> >
> > > > >> >> > I am interested in porting webkit to cairo for off-screen rendering
> > > > >> >> > without a X server. As I cannot find any documents about porting to
> > > > >> >> > other platform I would really appreciate if you could help me with some
> > > > >> >> > hints about porting webkit.
> > > > >> >> >
> > > > >> >> > Greets,
> > > > >> >> > Luka
> > > > >> >> >
> > > > >> >> > _______________________________________________
> > > > >> >> > webkit-dev mailing list
> > > > >> >> > webkit-dev at lists.webkit.org
> > > > >> >> > http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
> > > > >> >> >
> > > > >> >> >
> > > > >> >
> > > > >
> > > > _______________________________________________
> > > > webkit-dev mailing list
> > > > webkit-dev at lists.webkit.org
> > > > http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
> > > > 
> > > 
> 
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