MSSWindows: huge optimization of get_pixels()

Author: BoboTiG

doc/CHANGELOG

@@ -11,7 +11,7 @@ devel   201y/mm/dd
       - MSSLinux: fix object has no attribute 'display' into __del__
       - MSSLinux: use of XDestroyImage() instead of XFree()
       - MSSLinux: few optimizations into get_pixels()
-      - MSSWindows: optimization of get_pixels()
+      - MSSWindows: huge optimization of get_pixels()
 
 0.1.1   2015/04/10
       - little code review

mss.py

@@ -667,10 +667,8 @@ def get_pixels(self, monitor):
                 windll.gdi32.DeleteObject(bmp)
 
         # Replace pixels values: BGR to RGB
-        # @TODO: this part takes most of the time. Need a better solution.
-        for idx in range(0, buffer_len - 2, 3):
-            self.image[idx + 2], self.image[idx] = \
-                self.image[idx], self.image[idx + 2]
+        self.image[2:buffer_len:3], self.image[0:buffer_len:3] = \
+            self.image[0:buffer_len:3], self.image[2:buffer_len:3]
         return self.image