fix for 3d-display image export (blank box appears in image)

3d-viewer/3d_canvas.cpp

@@ -601,7 +601,7 @@ bool fmt_is_jpeg = FALSE;
 		if ( FullFileName.IsEmpty() ) return;
 	}
 	
-	wxYield();	// Requested to allow tne window redraw after closing the dialog box
+	Redraw(true);
 	wxSize image_size = GetClientSize();
 	wxClientDC dc(this);
 	wxBitmap bitmap(image_size.x, image_size.y );

3d-viewer/3d_draw.cpp

@@ -39,7 +39,7 @@ static void Draw3D_FilledSegmentWithHole(double startx, double starty,
 
 
 /**********************************/
-void Pcb3D_GLCanvas::Redraw( void )
+void Pcb3D_GLCanvas::Redraw( bool finish )
 /**********************************/
 {
     SetCurrent();
@@ -67,6 +67,7 @@ void Pcb3D_GLCanvas::Redraw( void )
 	}
 
 	glFlush();
+	if (finish) glFinish();
 	SwapBuffers();
  }
 

3d-viewer/3d_viewer.h

@@ -92,7 +92,7 @@ public:
 	void TakeScreenshot(wxCommandEvent & event);
 	void SetView3D(int keycode);
 	void DisplayStatus(void);
-	void Redraw(void);
+	void Redraw(bool finish = false);
 	GLuint DisplayCubeforTest(void);
 
 	void OnEnterWindow( wxMouseEvent& event );