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|
{-# LANGUAGE ForeignFunctionInterface #-}
------------------------------------------------------------------------------
-- |
-- Module: MinXft
-- Copyright: (c) 2012 Jose Antonio Ortega Ruiz
-- (c) Clemens Fruhwirth <clemens@endorphin.org> 2007
-- License: BSD3-style (see LICENSE)
--
-- Maintainer: jao@gnu.org
-- Stability: unstable
-- Portability: unportable
-- Created: Mon Sep 10, 2012 18:12
--
--
-- Pared down Xft library, based on Graphics.X11.Xft and providing
-- explicit management of XftColors, so that they can be cached.
--
-- Most of the code is lifted from Clemens's.
--
------------------------------------------------------------------------------
module MinXft ( AXftColor
, AXftDraw (..)
, AXftFont
, mallocAXftColor
, freeAXftColor
, withAXftDraw
, drawXftString
, drawXftRect
, openAXftFont
, closeAXftFont
, xftTxtExtents
, xft_ascent
, xft_descent
, xft_height
)
where
import Graphics.X11
import Graphics.X11.Xlib.Types
import Graphics.X11.Xrender
import Foreign
import Foreign.C.Types
import Foreign.C.String
import Codec.Binary.UTF8.String as UTF8
#include <X11/Xft/Xft.h>
-- Color Handling
newtype AXftColor = AXftColor (Ptr AXftColor)
foreign import ccall "XftColorAllocName"
cXftColorAllocName :: Display -> Visual -> Colormap -> CString -> AXftColor -> IO (#type Bool)
-- this is the missing bit in X11.Xft, not implementable from the
-- outside because XftColor does not export a constructor.
mallocAXftColor :: Display -> Visual -> Colormap -> String -> IO AXftColor
mallocAXftColor d v cm n = do
color <- mallocBytes (#size XftColor)
withCAString n $ \str -> cXftColorAllocName d v cm str (AXftColor color)
return (AXftColor color)
foreign import ccall "XftColorFree"
freeAXftColor :: Display -> Visual -> Colormap -> AXftColor -> IO ()
-- Font handling
newtype AXftFont = AXftFont (Ptr AXftFont)
xft_ascent :: AXftFont -> IO Int
xft_ascent (AXftFont p) = peekCUShort p #{offset XftFont, ascent}
xft_descent :: AXftFont -> IO Int
xft_descent (AXftFont p) = peekCUShort p #{offset XftFont, descent}
xft_height :: AXftFont -> IO Int
xft_height (AXftFont p) = peekCUShort p #{offset XftFont, height}
foreign import ccall "XftTextExtentsUtf8"
cXftTextExtentsUtf8 :: Display -> AXftFont -> CString -> CInt -> Ptr XGlyphInfo -> IO ()
xftTxtExtents :: Display -> AXftFont -> String -> IO XGlyphInfo
xftTxtExtents d f string =
withArrayLen (map fi (UTF8.encode string)) $
\len str_ptr -> alloca $
\cglyph -> do
cXftTextExtentsUtf8 d f str_ptr (fi len) cglyph
peek cglyph
foreign import ccall "XftFontOpenName"
c_xftFontOpen :: Display -> CInt -> CString -> IO AXftFont
openAXftFont :: Display -> Screen -> String -> IO AXftFont
openAXftFont dpy screen name =
withCAString name $
\cname -> c_xftFontOpen dpy (fi (screenNumberOfScreen screen)) cname
foreign import ccall "XftFontClose"
closeAXftFont :: Display -> AXftFont -> IO ()
-- Drawing
fi :: (Integral a, Num b) => a -> b
fi = fromIntegral
newtype AXftDraw = AXftDraw (Ptr AXftDraw)
foreign import ccall "XftDrawCreate"
c_xftDrawCreate :: Display -> Drawable -> Visual -> Colormap -> IO AXftDraw
foreign import ccall "XftDrawDestroy"
c_xftDrawDestroy :: AXftDraw -> IO ()
withAXftDraw :: Display -> Drawable -> Visual -> Colormap -> (AXftDraw -> IO a) -> IO a
withAXftDraw d p v c act = do
draw <- c_xftDrawCreate d p v c
a <- act draw
c_xftDrawDestroy draw
return a
foreign import ccall "XftDrawStringUtf8"
cXftDrawStringUtf8 :: AXftDraw -> AXftColor -> AXftFont -> CInt -> CInt -> Ptr (#type FcChar8) -> CInt -> IO ()
drawXftString :: (Integral a1, Integral a) =>
AXftDraw -> AXftColor -> AXftFont -> a -> a1 -> String -> IO ()
drawXftString d c f x y string =
withArrayLen (map fi (UTF8.encode string))
(\len ptr -> cXftDrawStringUtf8 d c f (fi x) (fi y) ptr (fi len))
foreign import ccall "XftDrawRect"
cXftDrawRect :: AXftDraw -> AXftColor -> CInt -> CInt -> CUInt -> CUInt -> IO ()
drawXftRect :: (Integral a3, Integral a2, Integral a1, Integral a) =>
AXftDraw -> AXftColor -> a -> a1 -> a2 -> a3 -> IO ()
drawXftRect draw color x y width height =
cXftDrawRect draw color (fi x) (fi y) (fi width) (fi height)
|
