Bug 108376 – [Gtk] drag and drop has black background without composition

• Component: WebKitGTK
• Status: RESOLVED FIXED

[arno.]

Hi, when dragging some text, a popup window with 0 opacity is created. It is then set as the drag icon with gtk_drag_set_icon_widget. While this gives a nice transparent result an a desktop with a compositor, it gives a black background when there is not compositor. So, if the text is black, it is not readable. And if the text is white, it's ugly anyway. May be we could use gtk_drag_set_icon_pixbuf as mozilla does (or gtk_drag_set_icon_surface when available to avoid a cairo/pixbuf conversion). This api decompose image into transparent/non transparent rectangles and use Xshape to make the transparent rectangles actually transparent even without a compositor.

[arno.]

Created attachment 185571 [details]
patch proposal

[Martin Robinson]

If we are falling back, maybe we should just fall back all the way to a simple icon? Maybe you can show me what the fallback looks like.

[arno.]

Created attachment 185612 [details]
updated patch: no need for a ManualTest

[Martin Robinson]

Comment on attachment 185612 [details]
updated patch: no need for a ManualTest

View in context: https://bugs.webkit.org/attachment.cgi?id=185612&action=review

Looks great, just needs a teensy bit of cleaning up.

> Source/WebCore/platform/gtk/DragIcon.cpp:56
> +#ifdef GTK_API_VERSION_2
> +    , m_pixbuf(0)
> +#endif

This can be eliminated with a GRefPtr. See below.

> Source/WebCore/platform/gtk/DragIcon.cpp:89
> +#ifdef GTK_API_VERSION_2
> +    if (m_pixbuf)
> +        g_object_unref(m_pixbuf);
> +#endif

Instead of a raw pointer you could use a GRefPtr here.

> Source/WebCore/platform/gtk/DragIcon.cpp:116
> +#ifdef GTK_API_VERSION_2
> +    if (m_pixbuf)
> +        g_object_unref(m_pixbuf);
> +    m_pixbuf = cairoImageSurfaceToGdkPixbuf(image);
> +#endif

This would become:

m_pixbuf = adoptGRef(cairoImageSurfaceToGdkPixbuf(image));

> Source/WebCore/platform/gtk/DragIcon.h:45
> +    gboolean m_iscomposited;

This should probably be:

bool isComposited;

[arno.]

Created attachment 185642 [details]
updated patch to address reviewer comments

[Martin Robinson]

Comment on attachment 185642 [details]
updated patch to address reviewer comments

Great!

[WebKit Review Bot]

Comment on attachment 185642 [details]
updated patch to address reviewer comments

Clearing flags on attachment: 185642

Committed r141498: <http://trac.webkit.org/changeset/141498>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.