[bug #44991] gfxmenu item drawing broken?

[Sebastian Pipping]

URL:
  <http://savannah.gnu.org/bugs/?44991>

                 Summary: gfxmenu item drawing broken?
                 Project: GNU GRUB
            Submitted by: hartwork
            Submitted on: Sat 02 May 2015 02:51:03 AM GMT
                Category: None
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: 2.02~beta1
         Reproducibility: None
         Planned Release: None

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Details:

Hi!

While playing with a theme I noticed that changing item selection triggers
drawing bugs with (selected_)item_pixmap_style images making use an alpha
channel (i.e. partial or full transparency.

In the screenshots attached you can see a simple theme right after loading and
after a few keypresses changing selection (<down>, <down>, <up> to be
precise).
The screenshots show that the current rendering behavior does paint the
(selected_)item_pixmap_style images on top of whatever was there before rather
than re-painting that area from the ground up.  (Any ideas why only part looks
broken while the leftmost third remains looking sane?)  The rendering order
needed for both the item obtaining selection and the item losing selection in
my eyes would be:

  Background color
  then background image
  then (selected_)item_pixmap_style images
  then text

I'll also attach the related theme.txt.
For the selected_item_pixmap_style, center/north/south are 30% opaque white,
the others 100% opaque.
For the item_pixmap_style, all of them are 0% opaque.
Version of GRUB is 2.02~beta2.

I'm not sure if that's related but I noticed that function canvas_paint reads

  if (canvas_area_status == GRUB_VIDEO_AREA_ENABLED)
    grub_video_set_area_status (GRUB_VIDEO_AREA_ENABLED);

in Git.  It looks to me like one of those should be _DISABLED, instead. 
True?


Would be cool to hear from you.

Best, Sebastian



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File Attachments:


-------------------------------------------------------
Date: Sat 02 May 2015 02:51:03 AM GMT  Name:
grub_gfxmenu_drawing_bug__just_loaded.png  Size: 98kB   By: hartwork

<http://savannah.gnu.org/bugs/download.php?file_id=33870>
-------------------------------------------------------
Date: Sat 02 May 2015 02:51:03 AM GMT  Name:
grub_gfxmenu_drawing_bug__down_down_up.png  Size: 99kB   By: hartwork

<http://savannah.gnu.org/bugs/download.php?file_id=33871>
-------------------------------------------------------
Date: Sat 02 May 2015 02:51:03 AM GMT  Name:
grub_gfxmenu_drawing_bug__theme.txt  Size: 822B   By: hartwork

<http://savannah.gnu.org/bugs/download.php?file_id=33872>

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