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authorjao <jao@gnu.org>2018-11-25 03:08:40 +0000
committerjao <jao@gnu.org>2018-11-25 03:08:40 +0000
commit658dd00771852286bb9ce007d11db869c237d934 (patch)
tree42884b7028392fdd68b550e89cee33c2687e8eed /src/lib/Xmobar/X11/XUtil.hs
parent071794d33443ff76d85be035394103fc8bf48e98 (diff)
downloadxmobar-658dd00771852286bb9ce007d11db869c237d934.tar.gz
xmobar-658dd00771852286bb9ce007d11db869c237d934.tar.bz2
Refactoring: Xmobar.X11
Diffstat (limited to 'src/lib/Xmobar/X11/XUtil.hs')
-rw-r--r--src/lib/Xmobar/X11/XUtil.hs129
1 files changed, 129 insertions, 0 deletions
diff --git a/src/lib/Xmobar/X11/XUtil.hs b/src/lib/Xmobar/X11/XUtil.hs
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+++ b/src/lib/Xmobar/X11/XUtil.hs
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+{-# LANGUAGE CPP #-}
+
+-----------------------------------------------------------------------------
+-- |
+-- Module : XUtil
+-- Copyright : (C) 2011, 2012, 2013, 2014, 2015, 2017, 2018 Jose Antonio Ortega Ruiz
+-- (C) 2007 Andrea Rossato
+-- License : BSD3
+--
+-- Maintainer : jao@gnu.org
+-- Stability : unstable
+-- Portability : unportable
+--
+-----------------------------------------------------------------------------
+
+module Xmobar.X11.XUtil
+ ( XFont(..)
+ , initFont
+ , initCoreFont
+ , initUtf8Font
+ , textExtents
+ , textWidth
+ ) where
+
+import Control.Exception (SomeException, handle)
+import Data.List
+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 )
+
+#if defined XFT
+import Xmobar.X11.MinXft
+import Graphics.X11.Xrender
+#else
+import System.IO(hPutStrLn, stderr)
+#endif
+
+data XFont = Core FontStruct
+ | Utf8 FontSet
+#ifdef XFT
+ | Xft [AXftFont]
+#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 =
+ let xftPrefix = "xft:" in
+ if xftPrefix `isPrefixOf` s then
+#ifdef XFT
+ fmap Xft $ initXftFont d s
+#else
+ do
+ hPutStrLn stderr $ "Warning: Xmobar must be built with "
+ ++ "the with_xft flag to support font '" ++ s
+ ++ ".' Falling back on default."
+ initFont d miscFixedFont
+#endif
+ else
+ fmap Utf8 $ initUtf8Font d s
+
+miscFixedFont :: String
+miscFixedFont = "-misc-fixed-*-*-*-*-*-*-*-*-*-*-*-*"
+
+-- | 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 <- handle fallBack getIt
+ addFinalizer f (freeFont d f)
+ return f
+ where getIt = loadQueryFont d s
+ fallBack :: SomeException -> IO FontStruct
+ fallBack = const $ loadQueryFont d miscFixedFont
+
+-- | 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
+ (_,_,f) <- handle fallBack getIt
+ addFinalizer f (freeFontSet d f)
+ return f
+ where getIt = createFontSet d s
+ fallBack :: SomeException -> IO ([String], String, FontSet)
+ fallBack = const $ createFontSet d miscFixedFont
+
+#ifdef XFT
+initXftFont :: Display -> String -> IO [AXftFont]
+initXftFont d s = do
+ let fontNames = wordsBy (== ',') (drop 4 s)
+ mapM openFont fontNames
+ where
+ openFont fontName = do
+ f <- openAXftFont d (defaultScreenOfDisplay d) fontName
+ addFinalizer f (closeAXftFont d f)
+ return f
+ wordsBy p str = case dropWhile p str of
+ "" -> []
+ str' -> w : wordsBy p str''
+ where
+ (w, str'') = break p str'
+#endif
+
+textWidth :: Display -> XFont -> String -> IO Int
+textWidth _ (Utf8 fs) s = return $ fromIntegral $ wcTextEscapement fs s
+textWidth _ (Core fs) s = return $ fromIntegral $ Xlib.textWidth fs s
+#ifdef XFT
+textWidth dpy (Xft xftdraw) s = do
+ gi <- xftTxtExtents' 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 = fromIntegral $ - (rect_y rl)
+ descent = fromIntegral $ rect_height rl + fromIntegral (rect_y rl)
+ return (ascent, descent)
+#ifdef XFT
+textExtents (Xft xftfonts) _ = do
+ ascent <- fromIntegral `fmap` xft_ascent' xftfonts
+ descent <- fromIntegral `fmap` xft_descent' xftfonts
+ return (ascent, descent)
+#endif