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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 Xmobar.Run.Parsers ( Segment, Widget(..), TextRenderInfo (..)
, colorComponents)
import Xmobar.Config.Types
import Xmobar.Text.Pango (fixXft)
import Xmobar.X11.Types
import qualified Xmobar.X11.Bitmap as B
import Xmobar.X11.XRender (drawBackground)
import Xmobar.X11.CairoSurface
type Renderinfo = (Segment, Surface -> Double -> Double -> IO (), Double)
type BitmapDrawer = Double -> Double -> String -> IO ()
type Actions = [ActionPos]
data DrawContext = DC { dcBitmapDrawer :: BitmapDrawer
, dcBitmapLookup :: String -> Maybe B.Bitmap
, dcConfig :: Config
, dcWidth :: Double
, dcHeight :: Double
, dcSegments :: [[Segment]]
}
readColourName :: String -> (SRGB.Colour Double, Double)
readColourName str =
case CNames.readColourName str of
Just c -> (c, 1.0)
Nothing -> case SRGB.sRGB24reads str of
[(c, "")] -> (c, 1.0)
[(c,d)] -> (c, read ("0x" ++ d))
_ -> (CNames.white, 1.0)
renderBackground :: Display -> Pixmap -> Config -> Dimension -> Dimension -> IO ()
renderBackground d p conf w h = do
let c = bgColor conf
(_, a) = readColourName c
a' = min (round $ 255 * a) (alpha conf)
drawBackground d p c a' (Rectangle 0 0 w h)
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
conf = (config xconf)
dc = DC (drawXBitmap xconf gc p) (lookupXBitmap xconf) conf dw dh s
render = renderSegments dc
liftIO $ renderBackground disp p conf w h
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
wd = w - o
slyt s off mx = do
when (off + w > mx) $ do
P.layoutSetEllipsize lyt P.EllipsizeEnd
P.layoutSetWidth lyt (Just $ mx - off)
C.renderWith s $ C.moveTo off voff >> P.showLayout lyt
return ((Text mk, inf, idx, a), slyt, wd)
withRenderinfo _ _ seg@(Hspace w, _, _, _) = do
return (seg, \_ _ _ -> return (), fromIntegral w)
withRenderinfo _ dctx seg@(Icon p, _, _, _) = do
let bm = dcBitmapLookup dctx p
wd = maybe 0 (fromIntegral . B.width) bm
ioff = iconOffset (dcConfig dctx)
vpos = dcHeight dctx / 2 + fromIntegral ioff
draw _ off mx = when (off + wd <= mx) $ dcBitmapDrawer dctx off vpos p
return (seg, draw, wd)
renderSegmentBackground ::
DrawContext -> Surface -> TextRenderInfo -> Double -> Double -> IO ()
renderSegmentBackground dctx surf info xbeg xend =
when (bg /= bgColor conf && (top >= 0 || bot >= 0)) $
C.renderWith surf $ do
setSourceColor (readColourName bg)
C.rectangle xbeg top (xend - xbeg) (dcHeight dctx - bot - top)
C.fillPreserve
where conf = dcConfig dctx
(_, bg) = colorComponents conf (tColorsString info)
top = fromIntegral $ tBgTopOffset info
bot = fromIntegral $ tBgBottomOffset info
renderSegment :: DrawContext -> Surface -> Double
-> (Double, Actions) -> Renderinfo -> IO (Double, Actions)
renderSegment dctx surface maxoff (off, acts) (segment, render, lwidth) = do
let end = min maxoff (off + lwidth)
(_, info, _, a) = segment
acts' = case a of Just as -> (as, round off, round end):acts; _ -> acts
renderSegmentBackground dctx surface info off end
render surface off maxoff
return (off + lwidth, acts')
setSourceColor :: (SRGB.Colour Double, Double) -> C.Render ()
setSourceColor (colour, alph) =
C.setSourceRGBA r g b alph
where rgb = SRGB.toSRGB colour
r = SRGB.channelRed rgb
g = SRGB.channelGreen rgb
b = SRGB.channelBlue rgb
drawRect :: String -> Double -> (Double, Double, Double, Double) -> C.Render()
drawRect name wd (x0, y0, x1, y1) = do
setSourceColor (readColourName name)
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
(lend, as) <- foldM (renderSegment dctx 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 dctx surface cmax) (cstart, as) clyts
(_, as'') <- foldM (renderSegment dctx surface dw) (rstart, as') rlyts
when (borderWidth conf > 0) (renderBorder conf dw dh surface)
return as''
|
