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|
-----------------------------------------------------------------------------
-- |
-- Module : Bitmap
-- Copyright : (C) 2013 Alexander Polakov
-- License : BSD3
--
-- Maintainer : jao@gnu.org
-- Stability : unstable
-- Portability : unportable
--
-----------------------------------------------------------------------------
module Bitmap
( updateCache
, drawBitmap
, Bitmap(..)) where
import Control.Monad
import Data.Map hiding (foldr, map, filter)
import Graphics.X11.Xlib
import System.Directory (doesFileExist)
import System.Mem.Weak ( addFinalizer )
import ColorCache
import Parsers (Widget(..))
import Actions (Action)
data Bitmap = Bitmap { width :: Dimension
, height :: Dimension
, pixmap :: Pixmap
}
updateCache :: Display -> Window -> Map FilePath Bitmap ->
[[(Widget, String, Maybe [Action])]] -> IO (Map FilePath Bitmap)
updateCache dpy win cache ps = do
let paths = map (\(Icon p, _, _) -> p) . concatMap (filter icons) $ ps
icons (Icon _, _, _) = True
icons _ = False
go m path = if member path m
then return m
else do bitmap <- loadBitmap dpy win path
return $ maybe m (\b -> insert path b m) bitmap
foldM go cache paths
loadBitmap :: Display -> Drawable -> FilePath -> IO (Maybe Bitmap)
loadBitmap d w p = do
exist <- doesFileExist p
if exist
then do
bmap <- readBitmapFile d w p
case bmap of
Right (bw, bh, bp, _, _) -> do
addFinalizer bp (freePixmap d bp)
return $ Just $ Bitmap bw bh bp
Left err -> do
putStrLn err
return Nothing
else
return Nothing
drawBitmap :: Display -> Drawable -> GC -> String -> String
-> Position -> Position -> Bitmap -> IO ()
drawBitmap d p gc fc bc x y i =
withColors d [fc, bc] $ \[fc', bc'] -> do
let w = width i
h = height i
setForeground d gc fc'
setBackground d gc bc'
copyPlane d (pixmap i) p gc 0 0 w h x (1 + y - fromIntegral h `div` 2) 1
|
