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|
{-# LANGUAGE ForeignFunctionInterface #-}
------------------------------------------------------------------------------
-- |
-- Module: MinXft
-- Copyright: (c) 2012, 2014 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
, drawXftString'
, 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 Foreign
import Foreign.C.Types
import Foreign.C.String
import Codec.Binary.UTF8.String as UTF8
import Data.Char (ord)
#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] -> [Char] ->
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)
|
