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|
{-# OPTIONS -fglasgow-exts #-}
-----------------------------------------------------------------------------
-- |
-- Module : XUtil
-- Copyright : (C) 2007 Andrea Rossato
-- License : BSD3
--
-- Maintainer : andrea.rossato@unibz.it
-- Stability : unstable
-- Portability : unportable
--
-----------------------------------------------------------------------------
module XUtil
( XFont
, initFont
, initCoreFont
, initUtf8Font
, releaseFont
, textExtents
, textWidth
, printString
, initColor
, newWindow
, nextEvent'
, readFileSafe
, hGetLineSafe
, io
, fi
) where
import Control.Concurrent
import Control.Monad
import Control.Monad.Trans
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.Posix.Types (Fd(..))
import System.IO
#if defined XFT || defined UTF_8
import Foreign.C
import qualified System.IO.UTF8 as UTF8 (readFile,hGetLine)
#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
if xftPrefix `isPrefixOf` s then
do setupLocale
xftdraw <- xftFontOpen d (defaultScreenOfDisplay d) (drop (length xftPrefix) s)
return (Xft xftdraw)
else
#endif
#ifdef UTF8
(setupLocale >> initUtf8Font d s >>= (return . Utf8))
#else
(initCoreFont d s >>= (return . Core))
#endif
#ifdef XFT
where xftPrefix = "xft:"
#endif
releaseFont :: Display -> XFont -> IO ()
#ifdef XFT
releaseFont d (Xft xftfont) = xftFontClose d xftfont
#endif
releaseFont d (Utf8 fs) = releaseUtf8Font d fs
releaseFont d (Core fs) = releaseCoreFont d fs
-- | 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 dpy s = catch (getIt dpy) (fallBack dpy)
where getIt d = loadQueryFont d s
fallBack d = const $ loadQueryFont d "-misc-fixed-*-*-*-*-10-*-*-*-*-*-*-*"
releaseCoreFont :: Display -> FontStruct -> IO ()
releaseCoreFont d = freeFont d
-- | 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 dpy s = do
(_,_,fs) <- catch (getIt dpy) (fallBack dpy)
return fs
where getIt d = createFontSet d s
fallBack d = const $ createFontSet d "-misc-fixed-*-*-*-*-10-*-*-*-*-*-*-*"
releaseUtf8Font :: Display -> FontSet -> IO ()
releaseUtf8Font d = freeFontSet d
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
[fc',bc'] <- mapM (initColor d) [fc,bc]
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 = do
[fc',bc'] <- mapM (initColor d) [fc,bc]
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
bcolor <- initColor dpy bc
(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)
(fi $ xglyphinfo_xOff gi)
(fi $ a + d)
withXftDraw dpy drw visual colormap $
\draw -> withXftColorName dpy visual colormap fc $
\color -> xftDrawString draw color font x y s
#endif
-- | Get the Pixel value for a named color: if an invalid name is
-- given the black pixel will be returned.
initColor :: Display -> String -> IO Pixel
initColor dpy c =
catch (initColor' dpy c) (const . return . blackPixel dpy $ (defaultScreen dpy))
initColor' :: Display -> String -> IO Pixel
initColor' dpy c = (color_pixel . fst) `liftM` allocNamedColor dpy colormap c
where colormap = defaultColormap dpy (defaultScreen dpy)
-- | 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 defined XFT || defined UTF8
#include <locale.h>
foreign import ccall unsafe "locale.h setlocale"
setlocale :: CInt -> CString -> IO CString
setupLocale :: IO ()
setupLocale = withCString "" $ \s -> do
setlocale (#const LC_ALL) s
return ()
#endif
|
