[webkit-dev] Transparency on GTK/DirectFB

[Nicholas Beck]

Hi Iulian,

Have you tried explicitly setting the background color to transparent in
the HTML body?
Regards,
Nick

Iulian wrote:
> Hi guys!
>
> I'm trying to do something similar.
> I have webkit (r30726 - because of this -
> https://bugs.webkit.org/show_bug.cgi?id=19941)
> with GTK over DirectFB.
>
> I created the main page and browser page (as in GtkLauncher).
> I successfully setted the ARGB color map for main window (made tests with
> WebKit window too).
> I called webkit_web_view_set_transparent() to set transparency to true.
> I load a page with no background, just some divs on top of the page.
>
> The problem is that i always have the white background (no matter what
> background color i set to the FrameView).
>
> If I create only the main window (without webkit) and i use expose-event to
> draw a transparent background it works fine, so transparency support has no
> problem.
>
> Please help me!
> Someone explain me how drawing are done in webkit, so i can have a clue
> where to dig.
>
> Iulian
>
>
> Weber, Bernd wrote:
>   
>> Thanks Christian, great pointers!
>>
>> I got it working! Very cool!
>>
>> -Bernd
>>
>>
>> For reference, here the changes I did in GtkLauncher:
>>
>> static void
>> make_transparent(WebKitWebView* l_web_view)
>> {
>>     GValue val = {0,};
>>     g_value_init (&val, G_TYPE_BOOLEAN);
>>     g_value_set_boolean (&val, 1);
>>     g_object_set_property (G_OBJECT (l_web_view), "transparent", &val);
>> }
>>
>> static void
>> make_transparent_cb (GtkWidget* widget, gpointer data)
>> {
>>     make_transparent (web_view);
>> }
>>
>> static void
>> set_colormap(GtkWidget* window)
>> {
>>     GdkScreen* screen = gtk_widget_get_screen (window);
>>     GdkColormap* colormap = gdk_screen_get_rgba_colormap (screen);
>>     if (!colormap) {
>>     	g_warning ("No ARGB colormap available! Using RGB colormap!\n");
>> 	colormap = gdk_screen_get_rgb_colormap (screen);
>>     } else {
>>     	g_print ("Using ARGB colormap now! :-)\n");
>>     }
>>     gtk_widget_set_colormap (window, colormap);
>> }
>>
>> In main.c:
>>  main_window = create_window ();
>>  set_colormap(main_window);
>>
>>
>>
>> -----Original Message-----
>> From: webkit-dev-bounces at lists.webkit.org
>> [mailto:webkit-dev-bounces at lists.webkit.org] On Behalf Of Christian
>> Dywan
>> Sent: Wednesday, September 24, 2008 3:48 PM
>> To: webkit-dev at lists.webkit.org
>> Subject: Re: [webkit-dev] Transparency on GTK/DirectFB
>>
>> Am Wed, 24 Sep 2008 15:16:24 -0700
>> schrieb Darin Adler <darin at apple.com>:
>>
>>     
>>> On Sep 24, 2008, at 3:10 PM, Weber, Bernd wrote:
>>>
>>>       
>>>> The holy grail however would be to achieve transparency to the  
>>>> underlying desktop, by defining "transparent" as the background
>>>> color.
>>>>         
>>> WebKit definitely supports this. It's used this way in the Mac OS X  
>>> Dashboard.
>>>
>>>       
>>>> I'm not sure whether Webkit, especially with GTK/DirectFB,
>>>> supports this right now.
>>>>         
>>> I don't know if the GTK/DirectFB port supports it. That's a question  
>>> for someone else.
>>>       
>> Take a look at the headers. There's no other documentation at this
>> point but it should be intuitive enough for most of what we have.
>>
>> webkit_web_view_set_transparent
>>
>> You will want that. And make sure you have an ARGB colour map on your
>> window, ie. when you create your toplevel window.
>>
>> ciao,
>>     Christian
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>> webkit-dev at lists.webkit.org
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>>
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>>     
>
>