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|
{-# LANGUAGE CPP #-}
-----------------------------------------------------------------------------
-- |
-- Module : Xmobar.X11.Text
-- Copyright : (C) 2011, 2012, 2013, 2014, 2015, 2017, 2018, 2022 Jose Antonio Ortega Ruiz
-- (C) 2007 Andrea Rossato
-- License : BSD3
--
-- Maintainer : jao@gnu.org
-- Stability : unstable
-- Portability : unportable
--
-----------------------------------------------------------------------------
module Xmobar.X11.Text
( XFont(..)
, initFont
, initCoreFont
, initUtf8Font
, textExtents
, textWidth
) where
import Control.Exception (SomeException, handle)
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 )
data XFont = Core FontStruct
| Utf8 FontSet
-- | 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 = 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
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
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 $ negate (rect_y rl)
descent = fromIntegral $ rect_height rl + fromIntegral (rect_y rl)
return (ascent, descent)
|
