changed get set rgb data so it's right side up

src/GlrRenW.cc

@@ -733,7 +733,7 @@ unsigned char *vtkGlrRenderWindow::GetPixelData(int x1, int y1, int x2, int y2,
     readsource(SRC_BACK);
     }
   p_data = data;
-  for (yloop = y_low; yloop <= y_hi; yloop++)
+  for (yloop = y_hi; yloop >= y_low; yloop--)
     {
     // read in a row of pixels 
     lrectread(x_low,yloop,x_hi,yloop,buffer);
@@ -803,7 +803,7 @@ void vtkGlrRenderWindow::SetPixelData(int x1, int y1, int x2, int y2,
 
   /* now write the binary info one row at a time */
   p_data = data;
-  for (yloop = y_low; yloop <= y_hi; yloop++)
+  for (yloop = y_hi; yloop >= y_low; yloop--)
     {
     for (xloop = 0; xloop <= (abs(x2-x1)); xloop++)
       {