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[Launchpad Bug Tracker <1436553@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package compiz -
1:0.9.12.1+15.10.20150805-0ubuntu1

---------------
compiz (1:0.9.12.1+15.10.20150805-0ubuntu1) wily; urgency=medium

  [ Alberts Muktupāvels ]
  * Change icon size back to 48px in application switcher plugin. (LP:
    #1237057)

  [ CI Train Bot ]
  * New rebuild forced.

  [ Dmitry Shachnev ]
  * Move window switcher plugins to compiz-plugins-default. (LP:
    #971051, #1465647)
  * debian/compiz-gnome.gsettings-override: Remove unityshell from
    active plugins, and add switcher. (LP: #1469086)

  [ Eleni Maria Stea ]
  * It fixes the 3d windows plugin. Problem: The 3d clipping is
    performed in viewing space (modelview transformation) and should be
    done inside the shader when we use shaders otherwise the viewing
    space pipeline operations will be ignored. Compiz used to perform
    the clipping inside the td plugin using pipeline functions, then it
    was loading a generic shader program (no clipping operations) to
    render the windows and then it rendered the 3d quads around the
    windows using the pipeline (so these were clipped correctly). (LP:
    #1395697)
  * Sometimes the MultipleCubes, Automatic or OneBigCube option might be
    set although we are not in multimonitor. Modified the 3d windows
    plugin to check the number of monitors as well.

  [ Marco Trevisan (Treviño) ]
  * Window: add clientFrame(), to get the client-side decoration extents
    (LP: #1422768, #1436553)
  * Window: compute the correct output using the absolute window
    position (LP: #1475721)

  [ Martin Wimpress ]
  * align MATE profile more closely with Marco

  [ Stephen M. Webb ]
  * Fix a FTBFS when -std=c++11 is used. (LP: #1477654)
  * Fixed the Compiz manpage and --help message to agree with the actual
    command-line options supported. (LP: #1475508)
  * force Compiz to build using C++-11 (required by build dependency
    libgtkmm-3.0-1). (LP: #1477978)

 -- CI Train Bot <ci-train-bot@xxxxxxxxxxxxx>  Wed, 05 Aug 2015 11:26:51
+0000

** Changed in: compiz (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1436553

Title:
  Transparent windows render black with Gtk3.16 and compiz

Status in Compiz:
  Fix Committed
Status in compiz package in Ubuntu:
  Fix Released

Bug description:
  Running compiz_1%3a0.9.12.0+15.04.20150202-0ubuntu1 without unity (in
  mate compiled with gtk-3) and testing Gtk-3.16 I run into serious
  issues with failures to render certain Gtk Windows transparent.
  Hardware is AMD FX 8120 with radeon HD 6750 GPU.

  My theme sets popup windows used by menus transparent, and Gtk
  application windows with client side decoration (CSD) have
  transparency underlying the GtkHeaderBar. In the latter case this is
  what makes rounded corners possible.   The transparent popup windows
  used with my theme to support menus resembling gnome-shell's widgets
  in my hacked Gtk3 version of mate-panel work fine with Gtk3.14 but due
  to the window issue get black corners with compiz and Gtk-3.16.
  Windows drawn transparent with cairo still work, but windows set
  transparent by GTK usually do not,

  Changing the window manager to Mutter makes transparency work
  perfectly. In Gtk-3.14 transparency works in Metacity with compositing
  enabled, it does not with gtk-3.16.

  I am not sure whether this should be considered a compiz bug or a Gtk
  bug, but since transparency works fine in gnome-shell and mutter (as
  used by shell), I am not sure the GNOME team would consider this a bug
  they are willing to fix.  If nobody fixes this any GNOME application
  that forces client side decoration (such as the gtk3-demo or gtk3
  -widget-factory) will be ugly in Ubuntu unless the client side
  decorations have square corners.

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