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+{-# OPTIONS_GHC -fglasgow-exts #-}
+
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  XMonad.Layout.Magnifier
+-- Copyright   :  (c) Peter De Wachter 2007
+-- License     :  BSD-style (see xmonad/LICENSE)
+-- 
+-- Maintainer  :  Peter De Wachter <pdewacht@gmail.com>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- Screenshot  :  <http://caladan.rave.org/magnifier.png>
+--
+-- This layout hack increases the size of the window that has focus.
+--
+-----------------------------------------------------------------------------
+
+
+module XMonad.Layout.Magnifier (
+    -- * Usage
+    -- $usage
+    magnifier, magnifier') where
+
+import Graphics.X11.Xlib (Window, Rectangle(..))
+import XMonad
+import XMonad.StackSet
+import XMonad.Layout.LayoutHelpers
+
+-- $usage
+-- > import XMonad.Layout.Magnifier
+-- > layouts = [ magnifier tiled , magnifier $ mirror tiled ]
+
+-- %import XMonad.Layout.Magnifier
+-- %layout , magnifier tiled
+-- %layout , magnifier $ mirror tiled
+
+-- | Increase the size of the window that has focus, unless it is the master window.
+magnifier :: Layout Window -> Layout Window
+magnifier = layoutModify (unlessMaster applyMagnifier) idModMod
+
+-- | Increase the size of the window that has focus, even if it is the master window.
+magnifier' :: Layout Window -> Layout Window
+magnifier' = layoutModify applyMagnifier idModMod
+
+unlessMaster :: ModDo Window -> ModDo Window
+unlessMaster mainmod r s wrs = if null (up s) then return (wrs, Nothing)
+                                              else mainmod r s wrs
+
+applyMagnifier :: ModDo Window
+applyMagnifier r _ wrs = do focused <- withWindowSet (return . peek)
+                            let mag (w,wr) ws | focused == Just w = ws ++ [(w, shrink r $ magnify wr)]
+                                              | otherwise         = (w,wr) : ws
+                            return (reverse $ foldr mag [] wrs, Nothing)
+
+magnify :: Rectangle -> Rectangle
+magnify (Rectangle x y w h) = Rectangle x' y' w' h'
+    where x' = x - fromIntegral (w' - w) `div` 2
+          y' = y - fromIntegral (h' - h) `div` 2
+          w' = round $ fromIntegral w * zoom
+          h' = round $ fromIntegral h * zoom
+          zoom = 1.5 :: Double
+
+shrink :: Rectangle -> Rectangle -> Rectangle
+shrink (Rectangle sx sy sw sh) (Rectangle x y w h) = Rectangle x' y' w' h'
+    where x' = max sx x 
+          y' = max sy y
+          w' = min w (fromIntegral sx + sw - fromIntegral x')
+          h' = min h (fromIntegral sy + sh - fromIntegral y')