From 7cd00f42deda004cc20d2335a0934bef8c295213 Mon Sep 17 00:00:00 2001
From: David Roundy <droundy@darcs.net>
Date: Tue, 16 Oct 2007 23:33:16 +0200
Subject: compute nice window border for WindowNavigation properly.

darcs-hash:20071016213316-72aca-5b6ee6fcf9232935499ca9b61e29663db55a1857.gz
---
 WindowNavigation.hs |  7 ++-----
 XUtils.hs           | 11 +++++++++++
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/WindowNavigation.hs b/WindowNavigation.hs
index b7f8fc9..c9977a3 100644
--- a/WindowNavigation.hs
+++ b/WindowNavigation.hs
@@ -108,11 +108,8 @@ instance LayoutModifier WindowNavigation Window where
         do XConf { normalBorder = nbc, focusedBorder = fbc } <- ask
            [uc,dc,lc,rc] <-
                case brightness conf of
-               Just frac -> return $ map round [myc,myc,myc,myc]
-                   -- Note:  The following is a fragile crude hack... it really only
-                   -- works properly when the only non-zero color is blue.  We should
-                   -- split the color into components and average *those*.
-                   where myc = (1-frac)*(fromIntegral nbc) + frac*(fromIntegral fbc)
+               Just frac -> do myc <- averagePixels fbc nbc frac
+                               return [myc,myc,myc,myc]
                Nothing -> mapM stringToPixel [upColor conf, downColor conf,
                                               leftColor conf, rightColor conf]
            let dirc U = uc
diff --git a/XUtils.hs b/XUtils.hs
index 4434c8f..f828529 100644
--- a/XUtils.hs
+++ b/XUtils.hs
@@ -16,6 +16,7 @@ module XMonadContrib.XUtils  (
                              -- * Usage:
                              -- $usage
                              stringToPixel
+                             , averagePixels
                              , initFont
                              , releaseFont
                              , createNewWindow
@@ -49,6 +50,16 @@ stringToPixel s = do
     where getIt    d = initColor d s
           fallBack d = const $ return $ blackPixel d (defaultScreen d)
 
+-- | Compute the weighted average the colors of two given Pixel values.
+averagePixels :: Pixel -> Pixel -> Double -> X Pixel
+averagePixels p1 p2 f =
+    do d <- asks display
+       let cm = defaultColormap d (defaultScreen d)
+       [Color _ r1 g1 b1 _,Color _ r2 g2 b2 _] <- io $ queryColors d cm [Color p1 0 0 0 0,Color p2 0 0 0 0]
+       let mn x1 x2 = round (fromIntegral x1 * f + fromIntegral x2 * (1-f))
+       Color p _ _ _ _ <- io $ allocColor d cm (Color 0 (mn r1 r2) (mn g1 g2) (mn b1 b2) 0)
+       return p
+
 -- | Given a fontname returns the fonstructure. If the font name is
 --  not valid the default font will be loaded and returned.
 initFont :: String -> X FontStruct
-- 
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