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