diff options
Diffstat (limited to 'XUtil.hsc')
| -rw-r--r-- | XUtil.hsc | 27 |
1 files changed, 25 insertions, 2 deletions
@@ -33,6 +33,7 @@ module XUtil import Control.Concurrent import Control.Monad import Control.Monad.Trans +import Data.IORef import Foreign import Graphics.X11.Xlib hiding (textExtents, textWidth) import qualified Graphics.X11.Xlib as Xlib (textExtents, textWidth) @@ -187,9 +188,30 @@ initColor :: Display -> String -> IO DynPixel initColor dpy c = (initColor' dpy c) `catch` (const . return $ DynPixel False (blackPixel dpy $ defaultScreen dpy)) +type ColorCache = [(String, Color)] +colorCache :: IO (IORef ColorCache) +colorCache = newIORef [] + +getCachedColor :: String -> IO (Maybe Color) +getCachedColor color_name = do + ref <- colorCache + result <- lookup color_name `fmap` readIORef ref + return result + +putCachedColor :: String -> Color -> IO () +putCachedColor color_name color_id = do + ref <- colorCache + modifyIORef ref $ \cache -> (color_name,color_id) : cache + initColor' :: Display -> String -> IO DynPixel initColor' dpy c = do - (c', _) <- allocNamedColor dpy colormap c + cached_color <- getCachedColor c + c' <- do + case cached_color of + Just col -> return col + _ -> do (c'', _) <- allocNamedColor dpy colormap c + putCachedColor c c'' + return c'' return $ DynPixel True (color_pixel c') where colormap = defaultColormap dpy (defaultScreen dpy) @@ -197,7 +219,8 @@ withColors :: MonadIO m => Display -> [String] -> ([Pixel] -> m a) -> m a withColors d cs f = do ps <- mapM (io . initColor d) cs r <- f $ map pixel ps - io $ freeColors d cmap (map pixel $ filter allocated ps) 0 + -- there is color leak in 'putCachedColor'. might be freed at xmobar shutdown + -- io $ freeColors d cmap (map pixel $ filter allocated ps) 0 return r where cmap = defaultColormap d (defaultScreen d) |