From 5246e75c2f035ab2002daf39717de5ac8901487f Mon Sep 17 00:00:00 2001
From: Eike Hein <hein@kde.org>
Date: Mon, 7 Jan 2008 00:35:46 +0000
Subject: [PATCH] Add support for XComposite translucency to the Konsole KPart.
 The decision to support translucent painting is made at part creation
 depending on whether the hosting application is using an ARGB visual and a
 composition manager has claimed the re- levant X selection (via
 KWindowSystem).

svn path=/trunk/KDE/kdebase/apps/konsole/; revision=758145
---
 src/Part.cpp          | 40 ++++++++++++++++++++++++++++++++++++++++
 src/Part.h            |  1 +
 src/TerminalDisplay.h |  3 ++-
 3 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/src/Part.cpp b/src/Part.cpp
index 39719da2..4b076d6f 100644
--- a/src/Part.cpp
+++ b/src/Part.cpp
@@ -23,11 +23,13 @@
 // Qt
 #include <QtCore/QStringList>
 
+
 // KDE
 #include <KAction>
 #include <KActionCollection>
 #include <KDebug>
 #include <KLocale>
+#include <KWindowSystem>
 #include <kdeversion.h>
 
 // Konsole
@@ -39,9 +41,16 @@
 #include "Session.h"
 #include "SessionController.h"
 #include "SessionManager.h"
+#include "TerminalDisplay.h"
 #include "ViewManager.h"
 #include "MainWindow.h"
 
+// X
+#ifdef Q_WS_X11
+#include <X11/Xlib.h>
+#include <X11/extensions/Xrender.h>
+#endif
+
 extern "C"
 {
     // entry point for Konsole part library,
@@ -70,6 +79,8 @@ Part::Part(QWidget* parentWidget , QObject* parent)
   ,_pluggedController(0)
   ,_manageProfilesAction(0)
 {
+    TerminalDisplay::HAVE_TRANSPARENCY = transparencyAvailable();
+
 	// setup global actions
 	createGlobalActions();
 
@@ -109,6 +120,35 @@ void Part::setupActionsForSession(SessionController* session)
 	KActionCollection* collection = session->actionCollection();
 	collection->addAction("manage-profiles",_manageProfilesAction);
 }
+bool Part::transparencyAvailable()
+{
+#ifdef Q_WS_X11
+    bool ARGB = false;
+
+    int screen = QX11Info::appScreen();
+    bool depth = (QX11Info::appDepth() == 32);
+
+    Display* display = QX11Info::display();
+    Visual* visual = static_cast<Visual*>(QX11Info::appVisual(screen));
+
+    XRenderPictFormat* format = XRenderFindVisualFormat(display, visual);
+
+    if (depth && format->type == PictTypeDirect && format->direct.alphaMask)
+    {
+        ARGB = true;
+    }
+
+    if (ARGB)
+    {
+        return KWindowSystem::compositingActive();
+    }
+    else
+#endif
+    {
+        return false;
+    }
+}
+
 bool Part::openFile()
 {
     return false;
diff --git a/src/Part.h b/src/Part.h
index 817d124c..935b81ed 100644
--- a/src/Part.h
+++ b/src/Part.h
@@ -119,6 +119,7 @@ private:
     Session* activeSession() const;
 	void setupActionsForSession(SessionController* session);
 	void createGlobalActions();
+    bool transparencyAvailable();
 
 private:
     ViewManager* _viewManager;
diff --git a/src/TerminalDisplay.h b/src/TerminalDisplay.h
index 684aeba0..9bea7657 100644
--- a/src/TerminalDisplay.h
+++ b/src/TerminalDisplay.h
@@ -386,6 +386,8 @@ public:
     /** Returns the terminal screen section which is displayed in this widget.  See setScreenWindow() */
     ScreenWindow* screenWindow() const;
 
+    static bool HAVE_TRANSPARENCY;
+
 public slots:
 
     /** 
@@ -728,7 +730,6 @@ private:
     };
     InputMethodData _inputMethodData;
 
-    static bool HAVE_TRANSPARENCY;
     static bool _antialiasText;   // do we antialias or not
 
     //the delay in milliseconds between redrawing blinking text