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|
------------------------------------------------------------------------------
-- |
-- Module: Xmobar.X11.CairoDraw
-- Copyright: (c) 2022 Jose Antonio Ortega Ruiz
-- License: BSD3-style (see LICENSE)
--
-- Maintainer: jao@gnu.org
-- Stability: unstable
-- Portability: unportable
-- Created: Fri Sep 09, 2022 02:03
--
-- Drawing the xmobar contents using Cairo and Pango
--
--
------------------------------------------------------------------------------
module Xmobar.X11.CairoDraw (drawInPixmap) where
import Prelude hiding (lookup)
import Data.Map (lookup)
import Control.Monad.IO.Class
import Control.Monad.Reader
import Graphics.X11.Xlib hiding (Segment)
import Graphics.Rendering.Cairo.Types
import qualified Graphics.Rendering.Cairo as C
import qualified Graphics.Rendering.Pango as P
import qualified Data.Colour.SRGB as SRGB
import qualified Data.Colour.Names as CNames
import qualified Data.Colour.RGBSpace as RGBS
import Xmobar.Run.Parsers (Segment, Widget(..), colorComponents, tColorsString)
import Xmobar.Run.Actions (Action)
import Xmobar.Config.Types
import Xmobar.Text.Pango (fixXft)
import Xmobar.X11.Types
import qualified Xmobar.X11.Bitmap as B
import Xmobar.X11.CairoSurface
type ActionPos = ([Action], Position, Position)
type Actions = [ActionPos]
type Renderinfo = (Segment, Surface -> Double -> IO (), Double)
type BitmapDrawer = Double -> Double -> String -> IO ()
data DrawContext = DC { dcBitmapDrawer :: BitmapDrawer
, dcBitmapLookup :: String -> Maybe B.Bitmap
, dcConfig :: Config
, dcWidth :: Double
, dcHeight :: Double
, dcSegments :: [[Segment]]
}
drawInPixmap :: GC -> Pixmap -> [[Segment]] -> X Actions
drawInPixmap gc p s = do
xconf <- ask
let disp = display xconf
vis = defaultVisualOfScreen (defaultScreenOfDisplay disp)
(Rectangle _ _ w h) = rect xconf
dw = fromIntegral w
dh = fromIntegral h
dc = DC (drawXBitmap xconf gc p) (lookupXBitmap xconf) (config xconf) dw dh s
render = renderSegments dc
liftIO $ withXlibSurface disp p vis (fromIntegral w) (fromIntegral h) render
lookupXBitmap :: XConf -> String -> Maybe B.Bitmap
lookupXBitmap xconf path = lookup path (iconCache xconf)
drawXBitmap :: XConf -> GC -> Pixmap -> BitmapDrawer
drawXBitmap xconf gc p h v path = do
let disp = display xconf
conf = config xconf
fc = fgColor conf
bc = bgColor conf
bm = lookupXBitmap xconf path
liftIO $ maybe (return ()) (B.drawBitmap disp p gc fc bc (round h) (round v)) bm
segmentMarkup :: Config -> Segment -> String
segmentMarkup conf (Text txt, info, idx, _actions) =
let fnt = fixXft $ indexedFont conf idx
(fg, bg) = colorComponents conf (tColorsString info)
attrs = [P.FontDescr fnt, P.FontForeground fg]
attrs' = if bg == bgColor conf then attrs else P.FontBackground bg:attrs
in P.markSpan attrs' $ P.escapeMarkup txt
segmentMarkup _ _ = ""
withRenderinfo :: P.PangoContext -> DrawContext -> Segment -> IO Renderinfo
withRenderinfo ctx dctx seg@(Text _, inf, idx, a) = do
let conf = dcConfig dctx
lyt <- P.layoutEmpty ctx
mk <- P.layoutSetMarkup lyt (segmentMarkup conf seg) :: IO String
(_, P.PangoRectangle o u w h) <- P.layoutGetExtents lyt
let voff' = fromIntegral $ indexedOffset conf idx
voff = voff' + (dcHeight dctx - h + u) / 2.0
slyt s pos = C.renderWith s $ C.moveTo pos voff >> P.showLayout lyt
return ((Text mk, inf, idx, a), slyt, w - o)
withRenderinfo _ _ seg@(Hspace w, _, _, _) = do
return (seg, \_ _ -> return (), fromIntegral w)
withRenderinfo _ dctx seg@(Icon p, _, idx, _) = do
let bm = dcBitmapLookup dctx p
wd = maybe 0 (fromIntegral . B.width) bm
ioff = indexedOffset (dcConfig dctx) idx
vpos = dcHeight dctx / 2 - fromIntegral ioff
draw _ off = dcBitmapDrawer dctx off vpos p
return (seg, draw, wd)
renderSegment ::
Surface -> Double -> (Double, Actions) -> Renderinfo -> IO (Double, Actions)
renderSegment surface maxoff (off, acts) (segment, render, lwidth) =
if off + lwidth > maxoff
then pure (off, acts)
else do
render surface off
let end = round $ off + lwidth
(_, _, _, a) = segment
acts' = case a of Just as -> (as, round off, end):acts; _ -> acts
return (off + lwidth, acts')
setSourceColor :: RGBS.Colour Double -> C.Render ()
setSourceColor = RGBS.uncurryRGB C.setSourceRGB . SRGB.toSRGB
readColourName :: String -> IO (RGBS.Colour Double)
readColourName str =
case CNames.readColourName str of
Just c -> return c
Nothing -> return $ SRGB.sRGB24read str
background :: Config -> SRGB.Colour Double -> C.Render ()
background conf colour = do
setSourceColor colour
C.paintWithAlpha $ fromIntegral (alpha conf) / 255.0
renderBackground :: Config -> Surface -> IO ()
renderBackground conf surface =
when (alpha conf >= 255)
(readColourName (bgColor conf) >>= C.renderWith surface . background conf)
drawRect :: String -> Double -> (Double, Double, Double, Double) -> C.Render()
drawRect name wd (x0, y0, x1, y1) = do
col <- liftIO $ readColourName name
setSourceColor col
C.setLineWidth wd
C.rectangle x0 y0 x1 y1
C.strokePreserve
outerBorder :: Config -> Double -> Double -> C.Render ()
outerBorder conf w h = do
let r = case border conf of
TopB -> (0, 0, w - 1, 0)
BottomB -> (0, h - 1, w - 1, h - 1)
FullB -> (0, 0, w - 1, h - 1)
TopBM m -> (0, fi m, w - 1, fi m)
BottomBM m -> (0, h - fi m, w - 1, h - fi m)
FullBM m -> (fi m, fi m, w - fi m - 1, h - fi m - 1)
NoBorder -> (-1, -1, -1, -1)
drawRect (borderColor conf) (fi (borderWidth conf)) r
where fi = fromIntegral
renderBorder :: Config -> Double -> Double -> Surface -> IO ()
renderBorder conf w h surf =
case border conf of
NoBorder -> return ()
_ -> C.renderWith surf (outerBorder conf w h)
layoutsWidth :: [Renderinfo] -> Double
layoutsWidth = foldl (\a (_,_,w) -> a + w) 0
renderSegments :: DrawContext -> Surface -> IO Actions
renderSegments dctx surface = do
let [left, center, right] = take 3 $ dcSegments dctx
dh = dcHeight dctx
dw = dcWidth dctx
conf = dcConfig dctx
ctx <- P.cairoCreateContext Nothing
llyts <- mapM (withRenderinfo ctx dctx) left
rlyts <- mapM (withRenderinfo ctx dctx) right
clyts <- mapM (withRenderinfo ctx dctx) center
renderBackground conf surface
(lend, as) <- foldM (renderSegment surface dw) (0, []) llyts
let rw = layoutsWidth rlyts
rstart = max (lend + 1) (dw - rw - 1)
cmax = rstart - 1
cw = layoutsWidth clyts
cstart = lend + 1 + max 0 (dw - rw - lend - cw) / 2.0
(_, as') <- foldM (renderSegment surface cmax) (cstart, as) clyts
(_, as'') <- foldM (renderSegment surface dw) (rstart, as') rlyts
when (borderWidth conf > 0) (renderBorder conf dw dh surface)
return as''
|
