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|
{-# LANGUAGE CPP #-}
------------------------------------------------------------------------------
-- |
-- 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 qualified Data.Colour.SRGB as SRGB
import qualified Data.Colour.Names as CNames
import Control.Monad.IO.Class
import Control.Monad.Reader
import Graphics.X11.Xlib hiding (Segment, drawSegments)
import Graphics.Rendering.Cairo.Types
import qualified Graphics.Rendering.Cairo as C
import qualified Graphics.Rendering.Pango as P
import Xmobar.Run.Parsers (Segment
, Widget(..)
, Box (..)
, BoxMargins (..)
, BoxBorder (..)
, BoxOffset (..)
, TextRenderInfo (..)
, colorComponents)
import Xmobar.Config.Types
import Xmobar.Text.Pango (fixXft)
import Xmobar.X11.Types
import Xmobar.X11.Boxes (boxLines, borderRect)
import qualified Xmobar.X11.Bitmap as B
#ifdef XRENDER
import Xmobar.X11.XRender (drawBackground)
#endif
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]]
}
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 = drawSegments dc
#ifdef XRENDER
liftIO $ drawBackground disp p (bgColor conf) (alpha conf) (Rectangle 0 0 w h)
#endif
liftIO $ withXlibSurface disp p vis (fromIntegral w) (fromIntegral h) render
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
lookupXBitmap :: XConf -> String -> Maybe B.Bitmap
lookupXBitmap xconf path = lookup path (iconCache xconf)
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)
setSourceColor :: (SRGB.Colour Double, Double) -> C.Render ()
setSourceColor (colour, alph) =
if alph < 1 then C.setSourceRGBA r g b alph else C.setSourceRGB r g b
where rgb = SRGB.toSRGB colour
r = SRGB.channelRed rgb
g = SRGB.channelGreen rgb
b = SRGB.channelBlue rgb
renderLines :: String -> Double -> [(Double, Double, Double, Double)] -> C.Render ()
renderLines color wd lns = do
setSourceColor (readColourName color)
C.setLineWidth wd
mapM_ (\(x0, y0, x1, y1) -> C.moveTo x0 y0 >> C.lineTo x1 y1 >> C.stroke) lns
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, _, _, _) =
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)
drawBox :: DrawContext -> Surface -> Double -> Double -> Box -> IO ()
drawBox dctx surf x0 x1 box@(Box _ _ w color _) =
C.renderWith surf $
renderLines color (fromIntegral w) (boxLines box (dcHeight dctx) x0 x1)
drawSegmentBackground ::
DrawContext -> Surface -> TextRenderInfo -> Double -> Double -> IO ()
drawSegmentBackground dctx surf info x0 x1 =
when (bg /= bgColor conf && (top >= 0 || bot >= 0)) $
C.renderWith surf $ do
setSourceColor (readColourName bg)
C.rectangle x0 top (x1 - x0) (dcHeight dctx - bot - top)
C.fillPreserve
where conf = dcConfig dctx
(_, bg) = colorComponents conf (tColorsString info)
top = fromIntegral $ tBgTopOffset info
bot = fromIntegral $ tBgBottomOffset info
type BoundedBoxes = [(Double, Double, [Box])]
type SegAcc = (Double, Actions, BoundedBoxes)
drawSegment :: DrawContext -> Surface -> Double -> SegAcc -> Renderinfo -> IO SegAcc
drawSegment dctx surface maxoff (off, acts, boxs) (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
bs = tBoxes info
boxs' = if null bs then boxs else (off, end, bs):boxs
drawSegmentBackground dctx surface info off end
render surface off maxoff
return (off + lwidth, acts', boxs')
renderOuterBorder :: Config -> Double -> Double -> C.Render ()
renderOuterBorder conf mw mh = do
let (x0, y0, w, h) = borderRect (border conf) mw mh
setSourceColor (readColourName (borderColor conf))
C.setLineWidth (fromIntegral (borderWidth conf))
C.rectangle x0 y0 w h
C.stroke
drawBorder :: Config -> Double -> Double -> Surface -> IO ()
drawBorder conf w h surf =
case border conf of
NoBorder -> return ()
_ -> C.renderWith surf (renderOuterBorder conf w h)
drawBoxes' :: DrawContext -> Surface -> (Double, Double, [Box]) -> IO ()
drawBoxes' dctx surf (from, to, bs) = mapM_ (drawBox dctx surf from to) bs
drawBoxes :: DrawContext -> Surface -> BoundedBoxes -> IO ()
drawBoxes dctx surf ((from, to, b):(from', to', b'):bxs) =
if to < from' || b /= b'
then do drawBoxes' dctx surf (from, to, b)
drawBoxes dctx surf $ (from', to', b'):bxs
else drawBoxes dctx surf $ (from, to', b'):bxs
drawBoxes dctx surf [bi] = drawBoxes' dctx surf bi
drawBoxes _ _ [] = return ()
#ifndef XRENDER
drawCairoBackground :: DrawContext -> Surface -> IO ()
drawCairoBackground dctx surf = do
let (c, _) = readColourName (bgColor (dcConfig dctx))
C.renderWith surf $ setSourceColor (c, 1.0) >> C.paint
#endif
drawSegments :: DrawContext -> Surface -> IO Actions
drawSegments dctx surf = do
let [left, center, right] = take 3 $ dcSegments dctx
dh = dcHeight dctx
dw = dcWidth dctx
conf = dcConfig dctx
sWidth = foldl (\a (_,_,w) -> a + w) 0
ctx <- P.cairoCreateContext Nothing
llyts <- mapM (withRenderinfo ctx dctx) left
rlyts <- mapM (withRenderinfo ctx dctx) right
clyts <- mapM (withRenderinfo ctx dctx) center
#ifndef XRENDER
drawCairoBackground dctx surf
#endif
(lend, as, bx) <- foldM (drawSegment dctx surf dw) (0, [], []) llyts
let rw = sWidth rlyts
rstart = max (lend + 1) (dw - rw - 1)
cmax = rstart - 1
cw = sWidth clyts
cstart = lend + 1 + max 0 (dw - rw - lend - cw) / 2.0
(_, as', bx') <- foldM (drawSegment dctx surf cmax) (cstart, as, bx) clyts
(_, as'', bx'') <- foldM (drawSegment dctx surf dw) (rstart, as', bx') rlyts
drawBoxes dctx surf (reverse bx'')
when (borderWidth conf > 0) (drawBorder conf dw dh surf)
return as''
|
