cairo: drawing skeleton from an xlib cairo surface

2 files changed, 107 insertions, 0 deletions

diff --git a/src/Xmobar/X11/CairoDraw.hs b/src/Xmobar/X11/CairoDraw.hs
new file mode 100644
index 0000000..424ea90
--- /dev/null
+++ b/src/Xmobar/X11/CairoDraw.hs
@@ -0,0 +1,48 @@
+------------------------------------------------------------------------------
+-- |
+-- 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 Control.Monad.IO.Class
+import Control.Monad.Reader
+
+import Graphics.X11.Xlib hiding (Segment)
+import GI.Cairo.Render.Types
+
+import Xmobar.Run.Parsers (Segment)
+import Xmobar.X11.Types
+import Xmobar.X11.CairoSurface
+-- import Xmobar.Text.Pango
+import Xmobar.Config.Types
+
+drawInPixmap :: Pixmap -> Dimension -> Dimension -> [[Segment]] -> X ()
+drawInPixmap p w h s = do
+  xconf <- ask
+  let disp = display xconf
+      scr = screenOfDisplay disp 0
+      c = config xconf
+      fi = fromIntegral
+  liftIO $ withBitmapSurface disp p scr (fi w) (fi h) (renderSegments c s)
+
+
+renderSegment :: String -> String -> Surface -> Segment -> IO ()
+renderSegment _fg _bg _surface _segment = undefined
+
+renderSegments :: Config -> [[Segment]] -> Surface -> IO ()
+renderSegments conf segments surface = do
+  let bg = bgColor conf
+      fg = fgColor conf
+  mapM_ (renderSegment fg bg surface) (concat segments)
diff --git a/src/Xmobar/X11/CairoSurface.hsc b/src/Xmobar/X11/CairoSurface.hsc
new file mode 100644
index 0000000..af2e7ae
--- /dev/null
+++ b/src/Xmobar/X11/CairoSurface.hsc
@@ -0,0 +1,59 @@
+{-# LANGUAGE CPP, ForeignFunctionInterface, EmptyDataDecls #-}
+
+------------------------------------------------------------------------------
+-- |
+-- Module: Xmobar.X11.Cairo
+-- Copyright: (c) 2022 Jose Antonio Ortega Ruiz
+-- License: BSD3-style (see LICENSE)
+--
+-- Maintainer: jao@gnu.org
+-- Stability: unstable
+-- Portability: unportable
+-- Created: Thu Sep 08, 2022 01:25
+--
+--
+-- Xlib Cairo Surface creation
+--
+------------------------------------------------------------------------------
+
+module Xmobar.X11.CairoSurface (withXlibSurface, withBitmapSurface) where
+
+import Graphics.X11.Xlib.Types
+import Graphics.X11.Types
+import GI.Cairo.Render.Types
+import qualified GI.Cairo.Render.Internal as Internal
+
+import Foreign
+import Foreign.C
+
+#include <cairo/cairo-xlib.h>
+
+foreign import ccall "cairo_xlib_surface_create"
+   cSurfaceCreate :: Display -> Drawable -> Visual -> CInt -> CInt -> Ptr Surface
+
+foreign import ccall "cairo_xlib_surface_create_for_bitmap"
+   cBitmapCreate :: Display -> Pixmap -> Screen -> CInt -> CInt -> Ptr Surface
+
+createXlibSurface :: Display -> Drawable -> Visual -> Int -> Int -> IO Surface
+createXlibSurface d dr v w h =
+  mkSurface $ cSurfaceCreate d dr v (fromIntegral w) (fromIntegral h)
+
+withXlibSurface ::
+  Display -> Drawable -> Visual -> Int -> Int -> (Surface -> IO a) -> IO a
+withXlibSurface d dr v w h f = do
+  surface <- createXlibSurface d dr v w h
+  ret <- f surface
+  Internal.surfaceDestroy surface
+  return ret
+
+createBitmapSurface :: Display -> Pixmap -> Screen -> Int -> Int -> IO Surface
+createBitmapSurface d p s w h =
+  mkSurface $ cBitmapCreate d p s (fromIntegral w) (fromIntegral h)
+
+withBitmapSurface ::
+  Display -> Pixmap -> Screen -> Int -> Int -> (Surface -> IO a) -> IO a
+withBitmapSurface d p s w h f = do
+  surface <- createBitmapSurface d p s w h
+  ret <- f surface
+  Internal.surfaceDestroy surface
+  return ret