Very basic compositing with xrender.

svn path=/branches/work/kwin_composite/; revision=558481

CMakeLists.txt

@@ -60,6 +60,9 @@ endif (X11_Xcomposite_FOUND)
 if (X11_Xdamage_FOUND)
   target_link_libraries(kdeinit_kwin ${X11_Xdamage_LIB})
 endif (X11_Xdamage_FOUND)
+if (X11_Xrender_FOUND)
+  target_link_libraries(kdeinit_kwin ${X11_Xrender_LIB})
+endif (X11_Xrender_FOUND)
 
 install(TARGETS kdeinit_kwin  DESTINATION ${LIB_INSTALL_DIR} )
 

composite.cpp

@@ -14,6 +14,7 @@ License. See the file "COPYING" for the exact licensing terms.
 #include "unmanaged.h"
 #include "scene.h"
 #include "scene_basic.h"
+#include "scene_xrender.h"
 
 namespace KWinInternal
 {
@@ -33,7 +34,8 @@ void Workspace::setupCompositing()
     compositeTimer.start( 20 );
     XCompositeRedirectSubwindows( display(), rootWindow(), CompositeRedirectManual );
     setDamaged();
-    scene = new SceneBasic( this );
+//    scene = new SceneBasic( this );
+    scene = new SceneXrender( this );
     }
 
 void Workspace::finishCompositing()

scene_basic.h

@@ -25,7 +25,6 @@ class SceneBasic
         virtual void paint();
     };
 
-
 } // namespace
 
 #endif

scene_xrender.cpp

@@ -10,6 +10,10 @@ License. See the file "COPYING" for the exact licensing terms.
 
 #include "scene_xrender.h"
 
+#ifdef HAVE_XRENDER
+
+#include "toplevel.h"
+
 namespace KWinInternal
 {
 
@@ -17,4 +21,58 @@ namespace KWinInternal
 // SceneXrender
 //****************************************
 
+SceneXrender::SceneXrender( Workspace* ws )
+    : Scene( ws )
+    {
+    format = XRenderFindVisualFormat( display(), DefaultVisual( display(), DefaultScreen( display())));
+    XRenderPictureAttributes pa;
+    pa.subwindow_mode = IncludeInferiors;
+    front = XRenderCreatePicture( display(), rootWindow(), format, CPSubwindowMode, &pa );
+    createBuffer();
+    }
+
+SceneXrender::~SceneXrender()
+    {
+    XRenderFreePicture( display(), front );
+    XRenderFreePicture( display(), buffer );
+    }
+
+// TODO handle xrandr changes
+
+void SceneXrender::createBuffer()
+    {
+    if( buffer != None )
+        XRenderFreePicture( display(), buffer );
+    Pixmap pixmap = XCreatePixmap( display(), rootWindow(), displayWidth(), displayHeight(), QX11Info::appDepth());
+    buffer = XRenderCreatePicture( display(), pixmap, format, 0, 0 );
+    XFreePixmap( display(), pixmap ); // The picture owns the pixmap now
+    }
+
+void SceneXrender::paint()
+    {
+    XRenderColor col = { 0xffff, 0xffff, 0xffff, 0xffff };
+    XRenderFillRectangle( display(), PictOpSrc, buffer, &col, 0, 0, displayWidth(), displayHeight());
+    for( ToplevelList::ConstIterator it = windows.begin();
+         it != windows.end();
+         ++it )
+        {
+        QRect r = (*it)->geometry().intersect( QRect( 0, 0, displayWidth(), displayHeight()));
+        if( !r.isEmpty())
+            {
+            XWindowAttributes attrs;
+            if( !XGetWindowAttributes( display(), (*it)->handle(), &attrs ))
+                continue;
+            if( XRenderPictFormat* clientFormat = XRenderFindVisualFormat( display(), attrs.visual ))
+                {
+                Picture picture = XRenderCreatePicture( display(), (*it)->windowPixmap(), clientFormat, 0, 0 );
+                XRenderComposite( display(), PictOpSrc, picture, None, buffer, 0, 0, 0, 0,
+                    (*it)->x(), (*it)->y(), (*it)->width(), (*it)->height());
+                }
+            }
+        }
+    XRenderComposite( display(), PictOpSrc, buffer, None, front, 0, 0, 0, 0, 0, 0, displayWidth(), displayHeight());
+    XFlush( display());
+    }
+
 } // namespace
+#endif

scene_xrender.h

@@ -11,9 +11,32 @@ License. See the file "COPYING" for the exact licensing terms.
 #ifndef KWIN_SCENE_XRENDER_H
 #define KWIN_SCENE_XRENDER_H
 
+#include "config.h"
+
+#ifdef HAVE_XRENDER
+#include <X11/extensions/Xrender.h>
+
+#include "scene.h"
+
 namespace KWinInternal
 {
 
+class SceneXrender
+    : public Scene
+    {
+    public:
+        SceneXrender( Workspace* ws );
+        virtual ~SceneXrender();
+        virtual void paint();
+    private:
+        void createBuffer();
+        XRenderPictFormat* format;
+        Picture front;
+        Picture buffer;
+    };
+
 } // namespace
 
 #endif
+
+#endif