From f81a7cfef463907ba4b68cb1352a869960350685 Mon Sep 17 00:00:00 2001
From: jao <jao@gnu.org>
Date: Fri, 9 Sep 2022 03:03:57 +0100
Subject: cairo: drawing skeleton from an xlib cairo surface

---
 src/Xmobar/X11/CairoDraw.hs     | 48 +++++++++++++++++++++++++++++++++
 src/Xmobar/X11/CairoSurface.hsc | 59 +++++++++++++++++++++++++++++++++++++++++
 xmobar.cabal                    | 11 ++++++++
 3 files changed, 118 insertions(+)
 create mode 100644 src/Xmobar/X11/CairoDraw.hs
 create mode 100644 src/Xmobar/X11/CairoSurface.hsc

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
diff --git a/xmobar.cabal b/xmobar.cabal
index 55c27e8..6601a97 100644
--- a/xmobar.cabal
+++ b/xmobar.cabal
@@ -36,6 +36,10 @@ flag with_xft
   description: Use Xft to render text. UTF-8 support included.
   default: False
 
+flag with_cairo
+  description: Use Cairo and Pango to render text, instead of Xft. UTF-8 support included.
+  default: False
+
 flag with_inotify
   description: inotify support (modern Linux only). Required for the Mail and MBox plugins.
   default: False
@@ -141,6 +145,7 @@ library
                    Xmobar.X11.ColorCache,
                    Xmobar.X11.Window,
                    Xmobar.X11.Draw,
+                   Xmobar.X11.XlibDraw,
                    Xmobar.Plugins.Command,
                    Xmobar.Plugins.BufferedPipeReader,
                    Xmobar.Plugins.CommandReader,
@@ -230,6 +235,12 @@ library
        other-modules: Xmobar.X11.MinXft
        cpp-options: -DXFT
 
+    if flag(with_cairo)
+       build-depends: gi-cairo-render >= 0.1.1 && < 0.2
+       other-modules: Xmobar.X11.CairoSurface, Xmobar.X11.CairoDraw
+       x-c2hs-header: xmobar-gtk2hs.h
+       cpp-options: -DCAIRO
+
     if flag(with_inotify) || flag(all_extensions)
        build-depends: hinotify >= 0.3 && < 0.5
        other-modules: Xmobar.Plugins.Mail, Xmobar.Plugins.MBox
-- 
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