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frames: "Initialize" frame background

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Frames are painted on the frame window according to the GTK+ theme.
Depending on the target's visual, this means either drawing over
a black destination or a fully transparent one. So in cases where
the theme doesn't paint decorations with full opacity, decorations
for windows with an rgba visual look different from those with a
non-rgba visual. Using an rgba visual for all frames independent
from the client's visual can potentially break clients, so our
only option for a consistent appearance is to explicitly initialize
the frame background to black before painting the theme's decoration
on top.

https://bugzilla.gnome.org/show_bug.cgi?id=745060
This commit is contained in:
Florian Müllner 2016-06-23 12:35:44 +02:00
parent 9b5daf9094
commit 9ec231f603
1 changed files with 7 additions and 0 deletions
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7
src/ui/frames.c
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@ -1403,6 +1403,13 @@ meta_frames_draw (GtkWidget *widget,
gdk_cairo_region (cr, region);
cairo_clip (cr);
/* The target may be cleared to black or transparent, depending
* on the frame's visual; we don't want decorations to appear
* differently when the theme's decorations aren't fully opaque,
* so clear to black first
*/
cairo_paint (cr);
meta_ui_frame_paint (frame, cr);
cairo_region_destroy (region);