pituicat/src/Affection/Draw.hs

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{-# LANGUAGE RecordWildCards, BangPatterns #-}
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-- | Module for drawing primitives
module Affection.Draw
( drawRect
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, clear
, handleDrawRequest
, invalidateDrawRequest
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, present
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, process
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, clearArea
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) where
import Affection.Types
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import Data.Maybe (maybe)
import Foreign
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import Foreign.C.Types
import Control.Monad.State (get, put)
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import Control.Monad (when, unless)
import System.Glib.GObject
import qualified SDL
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import qualified BABL as B
import qualified GEGL as G
import Debug.Trace
drawRect
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:: G.GeglNode -- ^ Target Node
-> G.Color -- ^ Color to draw in
-> DrawType -- ^ Draw type
-> G.GeglRectangle -- ^ Dimensions of Rectangle
-> G.GeglBuffer -- ^ Final Buffer
-> Affection us ()
drawRect node color Fill rect@GeglRectangle{..} buf = do
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ad <- get
tempRoot <- liftIO $ G.gegl_node_new
opNode <- liftIO $ G.gegl_node_new_child tempRoot $ G.Operation "gegl:rectangle"
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[ G.Property "x" $ G.PropertyDouble $ fromIntegral rectangleX
, G.Property "y" $ G.PropertyDouble $ fromIntegral rectangleY
, G.Property "width" $ G.PropertyDouble $ fromIntegral rectangleWidth
, G.Property "height" $ G.PropertyDouble $ fromIntegral rectangleHeight
, G.Property "color" $ G.PropertyColor color
]
diw <- liftIO $ G.gegl_node_connect_to opNode "output" node "input"
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unless diw $ error "Affection.Draw.drawRect: connect failed"
put $ ad
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{ drawStack = (DrawRequest rect buf (Kill (Just tempRoot))) : drawStack ad
}
-- | Force update of a specific region on screen
present
:: G.GeglRectangle -- ^ Area to be updated
-> G.GeglBuffer -- ^ Target buffer
-> Bool -- ^ Shall the 'DrawRequest' persist?
-> Affection us ()
present rect buf kill = do
ad <- get
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let k = if not kill then Kill Nothing else Persist
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put ad
{ drawStack = (DrawRequest rect buf k) : drawStack ad
}
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process
:: G.GeglNode
-> Affection us ()
process = liftIO . G.gegl_node_process
putToSurface
:: Ptr a
-> G.GeglRectangle
-> Int
-> Int
-> DrawRequest
-> Affection us ()
putToSurface pixels realRect stride cpp DrawRequest{..} = do
ad <- get
liftIO $ SDL.lockSurface $ drawSurface ad
liftIO $ G.gegl_buffer_get
requestBuffer
(Just realRect)
1
(Just $ drawFormat ad)
(pixels `plusPtr`
(rectangleX realRect * cpp + rectangleY realRect * stride))
stride
G.GeglAbyssNone
liftIO $ SDL.unlockSurface $ drawSurface ad
-- | function for handling 'DrawRequest's and updating the output
handleDrawRequest
:: Ptr a -- ^ Pixel buffer to blit to
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-- -> B.BablFormatPtr -- ^ format to blit in
-> Int -- ^ Stride
-> Int -- ^ Components per Pixel
-> DrawRequest -- ^ 'DrawRequest' to handle
-> Affection us (Maybe DrawRequest)
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handleDrawRequest pixels stride cpp dr@DrawRequest{..} = do
ad <- get
let surf = drawSurface ad
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mrealRect <- liftIO $ G.gegl_rectangle_intersect
requestArea
(G.GeglRectangle 0 0 (fst $ drawDimensions ad) (snd $ drawDimensions ad))
maybe (return()) (\realRect -> do
liftIO $ SDL.lockSurface surf
liftIO $ G.gegl_buffer_get
requestBuffer
(Just realRect)
1
(Just $ drawFormat ad)
(pixels `plusPtr`
(rectangleX realRect * cpp + rectangleY realRect * stride))
stride
G.GeglAbyssNone
liftIO $ SDL.unlockSurface surf
-- liftIO $ SDL.updateWindowSurface $ drawWindow ad
) mrealRect
case requestPersist of
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Persist ->
return Nothing
Kill _ ->
return $ Just dr
-- | clear a previously drawn area
invalidateDrawRequest
:: Ptr a -- ^ Pixel buffer to blit to
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-- -> B.BablFormatPtr -- ^ format to blit in
-> Int -- ^ Stride
-> Int -- ^ Components per Pixel
-> DrawRequest -- ^ Drawrequest to invalidate
-> Affection us ()
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invalidateDrawRequest pixels stride cpp dr@DrawRequest{..} = do
ad <- get
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mrealRect <- liftIO $ G.gegl_rectangle_intersect
requestArea
(G.GeglRectangle 0 0 (fst $ drawDimensions ad) (snd $ drawDimensions ad))
maybe (return()) (\realRect -> do
let surf = drawSurface ad
liftIO $ clearArea requestBuffer realRect
liftIO $ SDL.lockSurface surf
liftIO $ G.gegl_buffer_get
requestBuffer
(Just realRect)
1
(Just $ drawFormat ad)
(pixels `plusPtr`
(rectangleX realRect * cpp + rectangleY realRect * stride))
stride
G.GeglAbyssNone
liftIO $ SDL.unlockSurface surf
) mrealRect
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case requestPersist of
Kill (Just victim) ->
liftIO $ G.gegl_node_drop victim
_ ->
return ()
-- liftIO $ SDL.updateWindowSurface $ drawWindow ad
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-- | compute color for a single pixel
colorize
:: (G.ComponentValue, G.ComponentValue, G.ComponentValue, G.ComponentValue) -- ^ Pixel information in buffer
-> G.Color -- ^ Color to draw over
-> (G.ComponentValue, G.ComponentValue, G.ComponentValue, G.ComponentValue) -- ^ Resulting colour
colorize (rr, rg, rb, ra) col =
let (G.CVdouble (CDouble br)) = rr
(G.CVdouble (CDouble bg)) = rg
(G.CVdouble (CDouble bb)) = rb
(G.CVdouble (CDouble ba)) = ra
(cr, cg, cb) = case col of
G.RGBA r g b _ -> (r, g, b)
G.RGB r g b -> (r, g, b)
ca = case col of
G.RGBA _ _ _ a -> a
G.RGB _ _ _ -> 1
alpha = ca
dst_a = ba
da = alpha + dst_a * (1 - alpha)
a_term = dst_a * (1 - alpha)
red = cr * alpha + br * a_term
gre = cg * alpha + bg * a_term
blu = cb * alpha + bb * a_term
in
( G.CVdouble $ CDouble $ red / da
, G.CVdouble $ CDouble $ gre / da
, G.CVdouble $ CDouble $ blu / da
, G.CVdouble $ CDouble $ ca
)
unsafeColorize col =
let
(r, g, b) = case col of
G.RGBA cr cg cb _ -> (cr, cg, cb)
G.RGB cr cg cb -> (cr, cg, cb)
a = case col of
G.RGBA _ _ _ ca -> ca
G.RGB _ _ _ -> 1
in
( G.CVdouble $ CDouble $ r
, G.CVdouble $ CDouble $ g
, G.CVdouble $ CDouble $ b
, G.CVdouble $ CDouble $ a
)
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-- | Clear a specified area of a buffer from all data
clearArea
:: G.GeglBuffer -- ^ Target buffer
-> G.GeglRectangle -- ^ Area to clear
-> IO ()
clearArea = G.gegl_buffer_clear
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-- | Clear the whole drawing area
clear :: G.GeglBuffer -> Affection us ()
clear buffer = do
ad <- get
SDL.V2 (CInt rw) (CInt rh) <- SDL.surfaceDimensions $ drawSurface ad
let (w, h) = (fromIntegral rw, fromIntegral rh)
liftIO $ clearArea buffer (GeglRectangle 0 0 w h)