Index: VTK/Rendering/vtkMesaRenderWindow.h
===================================================================
--- VTK.orig/Rendering/vtkMesaRenderWindow.h
+++ VTK/Rendering/vtkMesaRenderWindow.h
@@ -108,6 +108,7 @@
   // Get the size of the color buffer.
   // Returns 0 if not able to determine otherwise sets R G B and A into buffer.
   int GetColorBufferSizes(int *rgba);
+  int GetColorBufferSizes(vtkIntArray *rgba);
 
   // Description:
   // Initialize OpenGL for this window.
Index: VTK/Rendering/vtkOpenGLRenderWindow.cxx
===================================================================
--- VTK.orig/Rendering/vtkOpenGLRenderWindow.cxx
+++ VTK/Rendering/vtkOpenGLRenderWindow.cxx
@@ -17,6 +17,7 @@
 #include "vtkFloatArray.h"
 #include "vtkgl.h"
 #include "vtkIdList.h"
+#include "vtkIntArray.h"
 #include "vtkObjectFactory.h"
 #include "vtkOpenGLActor.h"
 #include "vtkOpenGLCamera.h"
@@ -353,6 +354,22 @@
     }
 }
 
+int vtkOpenGLRenderWindow::GetColorBufferSizes(vtkIntArray *rgba)
+{
+  if (rgba==NULL)
+    {
+    return 0;
+    }
+
+  if ( rgba->GetMaxId()+1 != 4)
+    {
+    vtkDebugMacro("Resizing array.");
+    rgba->SetNumberOfComponents(1);
+    rgba->SetNumberOfValues(4);
+    }
+  return this->GetColorBufferSizes(rgba->GetPointer(0));
+}
+
 unsigned char* vtkOpenGLRenderWindow::GetPixelData(int x1, int y1, 
                                                    int x2, int y2,
                                                    int front)
Index: VTK/Rendering/vtkOpenGLRenderWindow.h
===================================================================
--- VTK.orig/Rendering/vtkOpenGLRenderWindow.h
+++ VTK/Rendering/vtkOpenGLRenderWindow.h
@@ -104,6 +104,7 @@
   // Get the size of the color buffer.
   // Returns 0 if not able to determine otherwise sets R G B and A into buffer.
   int GetColorBufferSizes(int *rgba);
+  int GetColorBufferSizes(vtkIntArray *rgba);
   
   // Description:
   // Initialize OpenGL for this window.
Index: VTK/Rendering/vtkRenderWindow.h
===================================================================
--- VTK.orig/Rendering/vtkRenderWindow.h
+++ VTK/Rendering/vtkRenderWindow.h
@@ -41,6 +41,7 @@
 #include "vtkWindow.h"
 
 class vtkFloatArray;
+class vtkIntArray;
 class vtkPainterDeviceAdapter;
 class vtkRenderWindowInteractor;
 class vtkRenderer;
@@ -497,6 +498,7 @@
   // Get the size of the color buffer.
   // Returns 0 if not able to determine otherwise sets R G B and A into buffer.
   virtual int GetColorBufferSizes(int *rgba) = 0;
+  virtual int GetColorBufferSizes(vtkIntArray *rgba) = 0;
 
   // Description:
   // Get the vtkPainterDeviceAdapter which can be used to paint on