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+------------------------------------------------------------------------------
+-- |
+-- Module: MinXft
+-- Copyright: (c) 2012, 2014, 2015, 2017 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.
+--
+------------------------------------------------------------------------------
+
+{-# LANGUAGE ForeignFunctionInterface, EmptyDataDecls #-}
+
+module Xmobar.MinXft ( AXftColor
+ , AXftDraw (..)
+ , AXftFont
+ , mallocAXftColor
+ , freeAXftColor
+ , withAXftDraw
+ , drawXftString
+ , drawXftString'
+ , drawBackground
+ , drawXftRect
+ , openAXftFont
+ , closeAXftFont
+ , xftTxtExtents
+ , xftTxtExtents'
+ , xft_ascent
+ , xft_ascent'
+ , xft_descent
+ , xft_descent'
+ , xft_height
+ , xft_height'
+ )
+
+where
+
+import Graphics.X11
+import Graphics.X11.Xlib.Types
+import Graphics.X11.Xrender
+import Graphics.X11.Xlib.Extras (xGetWindowProperty, xFree)
+
+import Foreign
+import Foreign.C.Types
+import Foreign.C.String
+import Codec.Binary.UTF8.String as UTF8
+import Data.Char (ord)
+
+import Control.Monad (when)
+
+#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_ascent' :: [AXftFont] -> IO Int
+xft_ascent' = (fmap maximum) . (mapM xft_ascent)
+
+xft_descent :: AXftFont -> IO Int
+xft_descent (AXftFont p) = peekCUShort p #{offset XftFont, descent}
+
+xft_descent' :: [AXftFont] -> IO Int
+xft_descent' = (fmap maximum) . (mapM xft_descent)
+
+xft_height :: AXftFont -> IO Int
+xft_height (AXftFont p) = peekCUShort p #{offset XftFont, height}
+
+xft_height' :: [AXftFont] -> IO Int
+xft_height' = (fmap maximum) . (mapM xft_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
+
+xftTxtExtents' :: Display -> [AXftFont] -> String -> IO XGlyphInfo
+xftTxtExtents' d fs string = do
+ chunks <- getChunks d fs string
+ let (_, _, gi, _, _) = last chunks
+ return gi
+
+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 ()
+
+foreign import ccall "XftCharExists"
+ cXftCharExists :: Display -> AXftFont -> (#type FcChar32) -> IO (#type FcBool)
+
+xftCharExists :: Display -> AXftFont -> Char -> IO Bool
+xftCharExists d f c = bool `fmap` cXftCharExists d f (fi $ ord c)
+ where
+ bool 0 = False
+ bool _ = True
+-- 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 "XftDrawDisplay"
+ c_xftDrawDisplay :: AXftDraw -> IO Display
+
+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))
+
+drawXftString' :: AXftDraw ->
+ AXftColor ->
+ [AXftFont] ->
+ Integer ->
+ Integer ->
+ String -> IO ()
+drawXftString' d c fs x y string = do
+ display <- c_xftDrawDisplay d
+ chunks <- getChunks display fs string
+ mapM_ (\(f, s, _, xo, yo) -> drawXftString d c f (x+xo) (y+yo) s) chunks
+
+-- Split string and determine fonts/offsets for individual parts
+getChunks :: Display -> [AXftFont] -> String ->
+ IO [(AXftFont, String, XGlyphInfo, Integer, Integer)]
+getChunks disp fts str = do
+ chunks <- getFonts disp fts str
+ getOffsets (XGlyphInfo 0 0 0 0 0 0) chunks
+ where
+ -- Split string and determine fonts for individual parts
+ getFonts _ [] _ = return []
+ getFonts _ _ [] = return []
+ getFonts _ [ft] s = return [(ft, s)]
+ getFonts d fonts@(ft:_) s = do
+ -- Determine which glyph can be rendered by current font
+ glyphs <- mapM (xftCharExists d ft) s
+ -- Split string into parts that can/cannot be rendered
+ let splits = split (runs glyphs) s
+ -- Determine which font to render each chunk with
+ concat `fmap` mapM (getFont d fonts) splits
+
+ -- Determine fonts for substrings
+ getFont _ [] _ = return []
+ getFont _ [ft] (_, s) = return [(ft, s)] -- Last font, use it
+ getFont _ (ft:_) (True, s) = return [(ft, s)] -- Current font can render this substring
+ getFont d (_:fs) (False, s) = getFonts d fs s -- Fallback to next font
+
+ -- Helpers
+ runs [] = []
+ runs (x:xs) = let (h, t) = span (==x) xs in (x, length h + 1) : runs t
+ split [] _ = []
+ split ((x, c):xs) s = let (h, t) = splitAt c s in (x, h) : split xs t
+
+ -- Determine coordinates for chunks using extents
+ getOffsets _ [] = return []
+ getOffsets (XGlyphInfo _ _ x y xo yo) ((f, s):chunks) = do
+ (XGlyphInfo w' h' _ _ xo' yo') <- xftTxtExtents disp f s
+ let gi = XGlyphInfo (xo+w') (yo+h') x y (xo+xo') (yo+yo')
+ rest <- getOffsets gi chunks
+ return $ (f, s, gi, fromIntegral xo, fromIntegral yo) : rest
+
+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)
+
+#include <X11/extensions/Xrender.h>
+
+type Picture = XID
+type PictOp = CInt
+
+data XRenderPictFormat
+data XRenderPictureAttributes = XRenderPictureAttributes
+
+-- foreign import ccall unsafe "X11/extensions/Xrender.h XRenderFillRectangle"
+ -- xRenderFillRectangle :: Display -> PictOp -> Picture -> Ptr XRenderColor -> CInt -> CInt -> CUInt -> CUInt -> IO ()
+foreign import ccall unsafe "X11/extensions/Xrender.h XRenderComposite"
+ xRenderComposite :: Display -> PictOp -> Picture -> Picture -> Picture -> CInt -> CInt -> CInt -> CInt -> CInt -> CInt -> CUInt -> CUInt -> IO ()
+foreign import ccall unsafe "X11/extensions/Xrender.h XRenderCreateSolidFill"
+ xRenderCreateSolidFill :: Display -> Ptr XRenderColor -> IO Picture
+foreign import ccall unsafe "X11/extensions/Xrender.h XRenderFreePicture"
+ xRenderFreePicture :: Display -> Picture -> IO ()
+foreign import ccall unsafe "string.h" memset :: Ptr a -> CInt -> CSize -> IO ()
+foreign import ccall unsafe "X11/extensions/Xrender.h XRenderFindStandardFormat"
+ xRenderFindStandardFormat :: Display -> CInt -> IO (Ptr XRenderPictFormat)
+foreign import ccall unsafe "X11/extensions/Xrender.h XRenderCreatePicture"
+ xRenderCreatePicture :: Display -> Drawable -> Ptr XRenderPictFormat -> CULong -> Ptr XRenderPictureAttributes -> IO Picture
+
+
+-- Attributes not supported
+instance Storable XRenderPictureAttributes where
+ sizeOf _ = #{size XRenderPictureAttributes}
+ alignment _ = alignment (undefined :: CInt)
+ peek _ = return XRenderPictureAttributes
+ poke p XRenderPictureAttributes =
+ memset p 0 #{size XRenderPictureAttributes}
+
+-- | Convenience function, gives us an XRender handle to a traditional
+-- Pixmap. Don't let it escape.
+withRenderPicture :: Display -> Drawable -> (Picture -> IO a) -> IO ()
+withRenderPicture d p f = do
+ format <- xRenderFindStandardFormat d 1 -- PictStandardRGB24
+ alloca $ \attr -> do
+ pic <- xRenderCreatePicture d p format 0 attr
+ f pic
+ xRenderFreePicture d pic
+
+-- | Convenience function, gives us an XRender picture that is a solid
+-- fill of color 'c'. Don't let it escape.
+withRenderFill :: Display -> XRenderColor -> (Picture -> IO a) -> IO ()
+withRenderFill d c f = do
+ pic <- with c (xRenderCreateSolidFill d)
+ f pic
+ xRenderFreePicture d pic
+
+-- | Drawing the background to a pixmap and taking into account
+-- transparency
+drawBackground :: Display -> Drawable -> String -> Int -> Rectangle -> IO ()
+drawBackground d p bgc alpha (Rectangle x y wid ht) = do
+ let render opt bg pic m =
+ xRenderComposite d opt bg m pic
+ (fromIntegral x) (fromIntegral y) 0 0
+ 0 0 (fromIntegral wid) (fromIntegral ht)
+ withRenderPicture d p $ \pic -> do
+ -- Handle background color
+ bgcolor <- parseRenderColor d bgc
+ withRenderFill d bgcolor $ \bgfill ->
+ withRenderFill d
+ (XRenderColor 0 0 0 (257 * alpha))
+ (render pictOpSrc bgfill pic)
+ -- Handle transparency
+ internAtom d "_XROOTPMAP_ID" False >>= \xid ->
+ let xroot = defaultRootWindow d in
+ alloca $ \x1 ->
+ alloca $ \x2 ->
+ alloca $ \x3 ->
+ alloca $ \x4 ->
+ alloca $ \pprop -> do
+ xGetWindowProperty d xroot xid 0 1 False 20 x1 x2 x3 x4 pprop
+ prop <- peek pprop
+ when (prop /= nullPtr) $ do
+ rootbg <- peek (castPtr prop) :: IO Pixmap
+ xFree prop
+ withRenderPicture d rootbg $ \bgpic ->
+ withRenderFill d (XRenderColor 0 0 0 (0xFFFF - 257 * alpha))
+ (render pictOpAdd bgpic pic)
+
+-- | Parses color into XRender color (allocation not necessary!)
+parseRenderColor :: Display -> String -> IO XRenderColor
+parseRenderColor d c = do
+ let colormap = defaultColormap d (defaultScreen d)
+ Color _ red green blue _ <- parseColor d colormap c
+ return $ XRenderColor (fromIntegral red) (fromIntegral green) (fromIntegral blue) 0xFFFF
+
+pictOpSrc, pictOpAdd :: PictOp
+pictOpSrc = 1
+pictOpAdd = 12
+
+-- pictOpMinimum = 0
+-- pictOpClear = 0
+-- pictOpDst = 2
+-- pictOpOver = 3
+-- pictOpOverReverse = 4
+-- pictOpIn = 5
+-- pictOpInReverse = 6
+-- pictOpOut = 7
+-- pictOpOutReverse = 8
+-- pictOpAtop = 9
+-- pictOpAtopReverse = 10
+-- pictOpXor = 11
+-- pictOpSaturate = 13
+-- pictOpMaximum = 13
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