kwin: Rename flushBuffer() to present()

This function doesn't flush any buffered commands, it presents or posts
the color buffer to the surface to which the GL context is bound.

eglonxbackend.cpp

@@ -187,7 +187,7 @@ bool EglOnXBackend::initBufferConfigs()
     return true;
 }
 
-void EglOnXBackend::flushBuffer()
+void EglOnXBackend::present()
 {
     if (lastMask() & Scene::PAINT_SCREEN_REGION && surfaceHasSubPost && eglPostSubBufferNV) {
         const QRect damageRect = lastDamage().boundingRect();
@@ -216,7 +216,7 @@ SceneOpenGL::TexturePrivate *EglOnXBackend::createBackendTexture(SceneOpenGL::Te
 void EglOnXBackend::prepareRenderingFrame()
 {
     if (!lastDamage().isEmpty())
-        flushBuffer();
+        present();
     startRenderTimer();
 }
 

eglonxbackend.h

@@ -38,7 +38,7 @@ public:
     virtual void endRenderingFrame(int mask, const QRegion &damage);
 
 protected:
-    virtual void flushBuffer();
+    virtual void present();
 
 private:
     void init();

glxbackend.cpp

@@ -429,7 +429,7 @@ void GlxBackend::waitSync()
 
 #undef VSYNC_DEBUG
 
-void GlxBackend::flushBuffer()
+void GlxBackend::present()
 {
     if (isDoubleBuffer()) {
         if (lastMask() & Scene::PAINT_SCREEN_REGION) {
@@ -535,7 +535,7 @@ SceneOpenGL::TexturePrivate *GlxBackend::createBackendTexture(SceneOpenGL::Textu
 void GlxBackend::prepareRenderingFrame()
 {
     if (!lastDamage().isEmpty())
-        flushBuffer();
+        present();
     glXWaitX();
 }
 

glxbackend.h

@@ -48,7 +48,7 @@ public:
     virtual void endRenderingFrame(int mask, const QRegion &damage);
 
 protected:
-    virtual void flushBuffer();
+    virtual void present();
 
 private:
     void init();

scene_opengl.cpp

@@ -133,7 +133,7 @@ void OpenGLBackend::setFailed(const QString &reason)
 
 void OpenGLBackend::idle()
 {
-    flushBuffer();
+    present();
 }
 
 /************************************************

scene_opengl.h

@@ -453,7 +453,7 @@ protected:
     /**
      * @brief Backend specific flushing of frame to screen.
      **/
-    virtual void flushBuffer() = 0;
+    virtual void present() = 0;
     /**
      * @brief Sets the backend initialization to failed.
      *

scene_xrender.cpp

@@ -189,14 +189,14 @@ int SceneXrender::paint(QRegion damage, ToplevelList toplevels)
     if (m_overlayWindow->window())  // show the window only after the first pass, since
         m_overlayWindow->show();   // that pass may take long
 
-    flushBuffer(mask, damage);
+    present(mask, damage);
     // do cleanup
     stacking_order.clear();
 
     return renderTimer.elapsed();
 }
 
-void SceneXrender::flushBuffer(int mask, QRegion damage)
+void SceneXrender::present(int mask, QRegion damage)
 {
     if (mask & PAINT_SCREEN_REGION) {
         // Use the damage region as the clip region for the root window

scene_xrender.h

@@ -61,7 +61,7 @@ public Q_SLOTS:
     virtual void windowClosed(KWin::Toplevel* c, KWin::Deleted* deleted);
 private:
     void createBuffer();
-    void flushBuffer(int mask, QRegion damage);
+    void present(int mask, QRegion damage);
     void initXRender(bool createOverlay);
     XRenderPictFormat* format;
     Picture front;