Haskell sources moved to src/ to unclutter toplevel

1 files changed, 259 insertions, 0 deletions

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+{-# OPTIONS -fglasgow-exts #-}
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  XUtil
+-- Copyright   :  (C) 2007 Andrea Rossato
+-- License     :  BSD3
+--
+-- Maintainer  :  andrea.rossato@unitn.it
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-----------------------------------------------------------------------------
+
+module XUtil
+    ( XFont
+    , initFont
+    , initCoreFont
+    , initUtf8Font
+    , textExtents
+    , textWidth
+    , printString
+    , initColor
+    , newWindow
+    , nextEvent'
+    , readFileSafe
+    , hGetLineSafe
+    , io
+    , fi
+    , withColors
+    , DynPixel(..)
+    ) where
+
+import Control.Concurrent
+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)
+import Graphics.X11.Xlib.Extras
+import System.Mem.Weak ( addFinalizer )
+import System.Posix.Types (Fd(..))
+import System.IO
+#if defined XFT || defined UTF8
+# if __GLASGOW_HASKELL__ < 612
+import Foreign.C
+import qualified System.IO.UTF8 as UTF8 (readFile,hGetLine)
+# else
+import qualified System.IO as UTF8 (readFile,hGetLine)
+# endif
+#endif
+#if defined XFT
+import Data.List
+import Graphics.X11.Xft
+import Graphics.X11.Xrender
+#endif
+
+readFileSafe :: FilePath -> IO String
+#if defined XFT || defined UTF8
+readFileSafe = UTF8.readFile
+#else
+readFileSafe = readFile
+#endif
+
+hGetLineSafe :: Handle -> IO String
+#if defined XFT || defined UTF8
+hGetLineSafe = UTF8.hGetLine
+#else
+hGetLineSafe = hGetLine
+#endif
+
+-- Hide the Core Font/Xft switching here
+data XFont = Core FontStruct
+           | Utf8 FontSet
+#ifdef XFT
+           | Xft  XftFont
+#endif
+
+-- | When initFont gets a font name that starts with 'xft:' it switchs to the Xft backend
+-- Example: 'xft:Sans-10'
+initFont :: Display ->String -> IO XFont
+initFont d s =
+#ifdef XFT
+       let xftPrefix = "xft:" in
+       if  xftPrefix `isPrefixOf` s then
+           fmap Xft $ initXftFont d s
+       else
+#endif
+#if defined UTF8 ||  __GLASGOW_HASKELL__ >= 612
+           fmap Utf8 $ initUtf8Font d s
+#else
+           fmap Core $ initCoreFont d s
+#endif
+
+-- | Given a fontname returns the font structure. If the font name is
+--  not valid the default font will be loaded and returned.
+initCoreFont :: Display -> String -> IO FontStruct
+initCoreFont d s = do
+  f <- catch getIt fallBack
+  addFinalizer f (freeFont d f)
+  return f
+      where getIt    = loadQueryFont d s
+            fallBack = const $ loadQueryFont d "-misc-fixed-*-*-*-*-10-*-*-*-*-*-*-*"
+
+-- | Given a fontname returns the font structure. If the font name is
+--  not valid the default font will be loaded and returned.
+initUtf8Font :: Display -> String -> IO FontSet
+initUtf8Font d s = do
+  setupLocale
+  (_,_,f) <- catch getIt fallBack
+  addFinalizer f (freeFontSet d f)
+  return f
+      where getIt    = createFontSet d s
+            fallBack = const $ createFontSet d "-misc-fixed-*-*-*-*-10-*-*-*-*-*-*-*"
+
+#ifdef XFT
+initXftFont :: Display -> String -> IO XftFont
+initXftFont d s = do
+  setupLocale
+  f <- xftFontOpen d (defaultScreenOfDisplay d) (drop 4 s)
+  addFinalizer f (xftFontClose d f)
+  return f
+#endif
+
+textWidth :: Display -> XFont -> String -> IO Int
+textWidth _   (Utf8 fs) s = return $ fi $ wcTextEscapement fs s
+textWidth _   (Core fs) s = return $ fi $ Xlib.textWidth fs s
+#ifdef XFT
+textWidth dpy (Xft xftdraw) s = do
+    gi <- xftTextExtents dpy xftdraw s
+    return $ xglyphinfo_xOff gi
+#endif
+
+textExtents :: XFont -> String -> IO (Int32,Int32)
+textExtents (Core fs) s = do
+  let (_,a,d,_) = Xlib.textExtents fs s
+  return (a,d)
+textExtents (Utf8 fs) s = do
+  let (_,rl)  = wcTextExtents fs s
+      ascent  = fi $ - (rect_y rl)
+      descent = fi $ rect_height rl + (fi $ rect_y rl)
+  return (ascent, descent)
+#ifdef XFT
+textExtents (Xft xftfont) _ = do
+  ascent  <- fi `fmap` xftfont_ascent  xftfont
+  descent <- fi `fmap` xftfont_descent xftfont
+  return (ascent, descent)
+#endif
+
+printString :: Display -> Drawable -> XFont -> GC -> String -> String
+            -> Position -> Position -> String  -> IO ()
+printString d p (Core fs) gc fc bc x y s = do
+    setFont d gc $ fontFromFontStruct fs
+    withColors d [fc, bc] $ \[fc', bc'] -> do
+      setForeground d gc fc'
+      setBackground d gc bc'
+      drawImageString d p gc x y s
+
+printString d p (Utf8 fs) gc fc bc x y s =
+    withColors d [fc, bc] $ \[fc', bc'] -> do
+      setForeground d gc fc'
+      setBackground d gc bc'
+      io $ wcDrawImageString d p fs gc x y s
+
+#ifdef XFT
+printString dpy drw fs@(Xft font) gc fc bc x y s = do
+  let screen   = defaultScreenOfDisplay dpy
+      colormap = defaultColormapOfScreen screen
+      visual   = defaultVisualOfScreen screen
+  withColors dpy [bc] $ \[bcolor] -> do
+    (a,d)  <- textExtents fs s
+    gi     <- xftTextExtents dpy font s
+    setForeground dpy gc bcolor
+    fillRectangle dpy drw gc (x - fi (xglyphinfo_x gi))
+                             (y - fi (a + d))
+                             (fi $ xglyphinfo_xOff gi)
+                             (fi $ 4 + a + d)
+    withXftDraw dpy drw visual colormap $
+      \draw -> withXftColorName dpy visual colormap fc $
+      \color -> xftDrawString draw color font x (y - 2) s
+#endif
+
+data DynPixel = DynPixel { allocated :: Bool
+                         , pixel     :: Pixel
+                         }
+
+-- | Get the Pixel value for a named color: if an invalid name is
+-- given the black pixel will be returned.
+initColor :: Display -> String -> IO DynPixel
+initColor dpy c = (initColor' dpy c) `catch`
+                  (const . return $ DynPixel False (blackPixel dpy $ defaultScreen dpy))
+
+type ColorCache = [(String, Color)]
+{-# NOINLINE colorCache #-}
+colorCache :: IORef ColorCache
+colorCache = unsafePerformIO $ newIORef []
+
+getCachedColor :: String -> IO (Maybe Color)
+getCachedColor color_name = lookup color_name `fmap` readIORef colorCache
+
+putCachedColor :: String -> Color -> IO ()
+putCachedColor name c_id = modifyIORef colorCache $ \c -> (name, c_id) : c
+
+initColor' :: Display -> String -> IO DynPixel
+initColor' dpy c = do
+  let colormap = defaultColormap dpy (defaultScreen dpy)
+  cached_color <- getCachedColor c
+  c' <- 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')
+
+withColors :: MonadIO m => Display -> [String] -> ([Pixel] -> m a) -> m a
+withColors d cs f = do
+  ps <- mapM (io . initColor d) cs
+  f $ map pixel ps
+
+-- | Creates a window with the attribute override_redirect set to True.
+-- Windows Managers should not touch this kind of windows.
+newWindow :: Display -> Screen -> Window -> Rectangle -> Bool -> IO Window
+newWindow dpy scr rw (Rectangle x y w h) o = do
+  let visual   = defaultVisualOfScreen scr
+      attrmask = cWOverrideRedirect
+  allocaSetWindowAttributes $
+         \attributes -> do
+           set_override_redirect attributes o
+           createWindow dpy rw x y w h 0 (defaultDepthOfScreen scr)
+                        inputOutput visual attrmask attributes
+-- | A version of nextEvent that does not block in foreign calls.
+nextEvent' :: Display -> XEventPtr -> IO ()
+nextEvent' d p = do
+    pend <- pending d
+    if pend /= 0
+        then nextEvent d p
+        else do
+            threadWaitRead (Fd fd)
+            nextEvent' d p
+ where
+    fd = connectionNumber d
+
+io :: MonadIO m => IO a -> m a
+io = liftIO
+
+-- | Short-hand for 'fromIntegral'
+fi :: (Integral a, Num b) => a -> b
+fi = fromIntegral
+
+#if __GLASGOW_HASKELL__ < 612 && (defined XFT || defined UTF8)
+#include <locale.h>
+foreign import ccall unsafe "locale.h setlocale"
+    setlocale :: CInt -> CString -> IO CString
+
+setupLocale :: IO ()
+setupLocale = withCString "" (setlocale $ #const LC_ALL) >> return ()
+# else
+setupLocale :: IO ()
+setupLocale = return ()
+#endif