Mondrian (empty) → 0.1.0.0

raw patch · 16 files changed

+2392/−0 lines, 16 filesdep +JuicyPixelsdep +Mondriandep +basesetup-changed

Dependencies added: JuicyPixels, Mondrian, base, bytestring, colour, css-syntax, gl, linear, mtl, scientific, sdl2, stylist-traits, text, typograffiti, unordered-containers, vector

Files

• CHANGELOG.md +5/−0
• LICENSE +674/−0
• Mondrian.cabal +67/−0
• Setup.hs +2/−0
• app/Convert.hs +29/−0
• app/Main.hs +90/−0
• lib/Graphics/Rendering/Rect.hs +50/−0
• lib/Graphics/Rendering/Rect/Backgrounds.hs +276/−0
• lib/Graphics/Rendering/Rect/Border.hs +99/−0
• lib/Graphics/Rendering/Rect/CSS.hs +42/−0
• lib/Graphics/Rendering/Rect/CSS/Backgrounds.hs +333/−0
• lib/Graphics/Rendering/Rect/CSS/Border.hs +169/−0
• lib/Graphics/Rendering/Rect/CSS/Colour.hs +310/−0
• lib/Graphics/Rendering/Rect/Image.hs +100/−0
• lib/Graphics/Rendering/Rect/Types.hs +142/−0
• test/MyLibTest.hs +4/−0

@@ -0,0 +1,5 @@+# Revision history for Mondrian++## 0.1.0.0 -- YYYY-mm-dd++* First version. Released on an unsuspecting world.

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If not, see <http://www.gnu.org/licenses/>.++Also add information on how to contact you by electronic and paper mail.++  If the program does terminal interaction, make it output a short+notice like this when it starts in an interactive mode:++    <program>  Copyright (C) <year>  <name of author>+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.+    This is free software, and you are welcome to redistribute it+    under certain conditions; type `show c' for details.++The hypothetical commands `show w' and `show c' should show the appropriate+parts of the General Public License.  Of course, your program's commands+might be different; for a GUI interface, you would use an "about box".++  You should also get your employer (if you work as a programmer) or school,+if any, to sign a "copyright disclaimer" for the program, if necessary.+For more information on this, and how to apply and follow the GNU GPL, see+<http://www.gnu.org/licenses/>.++  The GNU General Public License does not permit incorporating your program+into proprietary programs.  If your program is a subroutine library, you+may consider it more useful to permit linking proprietary applications with+the library.  If this is what you want to do, use the GNU Lesser General+Public License instead of this License.  But first, please read+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

@@ -0,0 +1,67 @@+cabal-version:       >=1.10+-- Initial package description 'Mondrian.cabal' generated by 'cabal init'.+--   For further documentation, see http://haskell.org/cabal/users-guide/++name:                Mondrian+version:             0.1.0.0+synopsis:            Renders backgrounds & borders+-- description:+homepage:            https://argonaut-constellation.org/+-- bug-reports:+license:             GPL-3+license-file:        LICENSE+author:              Adrian Cochrane+maintainer:          ~alcinnz/Mondrian@todo.argonaut-constellation.org+-- copyright:+category:            Graphics+build-type:          Simple+extra-source-files:  CHANGELOG.md++library+  exposed-modules:     Graphics.Rendering.Rect,+                       Graphics.Rendering.Rect.Backgrounds,+                       Graphics.Rendering.Rect.Border,+                       Graphics.Rendering.Rect.Image,+                       Graphics.Rendering.Rect.CSS,+                       Graphics.Rendering.Rect.CSS.Colour,+                       Graphics.Rendering.Rect.CSS.Backgrounds,+                       Graphics.Rendering.Rect.CSS.Border+  other-modules:       Graphics.Rendering.Rect.Types+  -- other-extensions:+  build-depends:       base >=4.13 && <5, stylist-traits >= 0.1.3.1 && < 1,+                       css-syntax, colour >= 2.3.6 && < 3, scientific, text,+                       bytestring, typograffiti >=0.2 && <0.4, linear,+                       gl, vector, mtl,+                       unordered-containers>=0.2 && <1, JuicyPixels >=3.0 && <4+  hs-source-dirs:      lib+  default-language:    Haskell2010++  ghc-options: -Wall++executable Mondrian+  main-is:             Main.hs+  -- other-modules:+  -- other-extensions:+  build-depends:       base >=4.13 && <5, Mondrian, sdl2 >= 2.5.4, gl, linear,+                        stylist-traits, text, css-syntax, JuicyPixels+  hs-source-dirs:      app+  default-language:    Haskell2010++  ghc-options: -Wall++executable Convert+  main-is:              Convert.hs+  build-depends:        base >= 4.13 && <5, JuicyPixels+  hs-source-dirs:       app+  default-language:     Haskell2010++  ghc-options: -Wall++test-suite Mondrian-test+  default-language:    Haskell2010+  type:                exitcode-stdio-1.0+  hs-source-dirs:      test+  main-is:             MyLibTest.hs+  build-depends:       base >=4.13 && <5++  ghc-options: -Wall

@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

@@ -0,0 +1,29 @@+module Main where++import Codec.Picture (readImage, savePngImage, DynamicImage(..), Image, PixelF)+import Codec.Picture.Types (promoteImage, convertImage, pixelMap)+import System.Environment (getArgs)++main :: IO ()+main = do+    [path] <- getArgs+    Right img <- readImage path+    savePngImage "out.png" $ convertDyn img++-- Convert pixels to some flavour of RGBA+convertDyn :: DynamicImage -> DynamicImage+convertDyn (ImageY8 img) = ImageRGBA8 $ promoteImage img+convertDyn (ImageY16 img) = ImageRGBA16 $ promoteImage img+convertDyn (ImageY32 img) =+    ImageRGBF $ promoteImage (pixelMap fromIntegral img :: Image PixelF)+convertDyn (ImageYF img) = ImageRGBF $ promoteImage img+convertDyn (ImageYA8 img) = ImageRGBA8 $ promoteImage img+convertDyn (ImageYA16 img) = ImageRGBA16 $ promoteImage img+convertDyn (ImageRGB8 img) = ImageRGB8 img+convertDyn (ImageRGB16 img) = ImageRGB16 img+convertDyn (ImageRGBF img) = ImageRGBF img+convertDyn (ImageRGBA8 img) = ImageRGBA8 img+convertDyn (ImageRGBA16 img) = ImageRGBA16 img+convertDyn (ImageYCbCr8 img) = ImageRGB8 $ convertImage img+convertDyn (ImageCMYK8 img) = ImageRGB8 $ convertImage img+convertDyn (ImageCMYK16 img) = ImageRGB16 $ convertImage img

@@ -0,0 +1,90 @@+{-# LANGUAGE OverloadedStrings #-}+module Main where++import Graphics.Rendering.Rect+import Stylist.Parse (parseProperties')+import Stylist (PropertyParser(..))+import Data.Text (Text, pack, unpack)+import Data.CSS.Syntax.Tokens (tokenize, serialize, Token(Whitespace))++import SDL hiding (trace)+import Graphics.GL.Core32+import System.Environment (getArgs)++import Data.Function (fix)+import Control.Monad (unless)+import Control.Monad.IO.Class (MonadIO (..))++import Codec.Picture (DynamicImage(..), PixelRGBA8(..),+                        readImage, generateImage)++import Debug.Trace (trace) -- To warn about invalid args++parseStyle :: PropertyParser p => String -> p+parseStyle syn+    | (ret, []) <- parseProperties' toks = apply ret+    | (ret, rest) <- parseProperties' toks =+        trace ("Extraneous chars: " ++ unpack (serialize rest)) $ apply ret+  where+    toks = tokenize $ pack syn+    apply ((key, val):props)+        | Just self' <- longhand self self key val' = self'+        | props'@(_:_) <- shorthand self key val' = apply (props' ++ props)+        | otherwise = trace ("Unsupported property " ++ unpack key) self+      where+        self = apply props+        val' = filter (/= Whitespace) val+    apply [] = temp++orthoProjection :: (Fractional a1, Integral a2) => V2 a2 -> M44 a1+orthoProjection (V2 ww wh) =+  let (hw,hh) = (fromIntegral ww, fromIntegral wh)+  in ortho 0 hw hh 0 0 1++main :: IO ()+main = do+    SDL.initializeAll+    args <- getArgs+    let style :: RectStyle Text+        style = case args of+            [] -> trace "Using blank styles, should see blank screen!" temp+            [arg] -> parseStyle arg+            (arg:_) -> trace "Extraneous commandline args!" $ parseStyle arg++    let openGL = defaultOpenGL { glProfile = Core Debug 3 3 }+        wcfg = defaultWindow {+            windowInitialSize = V2 640 480,+            windowGraphicsContext = OpenGLContext openGL,+            windowResizable = True+          }+    w <- createWindow "Mondrian" wcfg+    _ <- glCreateContext w++    atlas <- atlasFromStyles loadImage [style]+    let style' = styleResolveImages atlas style++    render <- renderRects+    fix $ \loop -> do+        events <- fmap eventPayload <$> pollEvents+        liftIO $ glClearColor 1 1 1 1+        liftIO $ glClear GL_COLOR_BUFFER_BIT++        sz@(V2 dw dh) <- liftIO $ glGetDrawableSize w+        liftIO $ glViewport 0 0 (fromIntegral dw) (fromIntegral dh)++        let rect = Rect 0 0 (fromIntegral dw) (fromIntegral dh)+            rects = Rects (shrink1 rect 150) (shrink1 rect 100) (shrink1 rect 50) rect++        render style' rects $ orthoProjection sz++        liftIO $ glSwapWindow w+        unless (QuitEvent `elem` events) loop++loadImage :: Text -> IO DynamicImage+loadImage path = do+    ret <- readImage $ unpack path+    return $ case ret of+        Right x -> x+        Left _ -> ImageRGBA8 $ generateImage transparent 1 1+transparent :: p1 -> p2 -> PixelRGBA8+transparent _ _ = PixelRGBA8 0 0 0 0

@@ -0,0 +1,50 @@+module Graphics.Rendering.Rect(Rect(..), Rects(..), shrink, shrink1, renderRects,+    RectStyle(..), colour, border,+    Backgrounds(..), Pattern(..), Resize(..), Length(..), RadialShape(..),+    Border(..), BorderStyle(..), topColour, rightColour, bottomColour, leftColour,+    Atlas, buildAtlas, atlasFromStyles, Texture, styleResolveImages) where++import Graphics.Rendering.Rect.CSS+import Graphics.Rendering.Rect.Backgrounds+import Graphics.Rendering.Rect.Types+import Graphics.Rendering.Rect.Image+import Graphics.Rendering.Rect.Border++import Linear (M44)+import Control.Monad.IO.Class (MonadIO)++import Codec.Picture (DynamicImage)+import Data.Text (Text)+import Data.List (nub)++shrink :: Rect -> Float -> Float -> Float -> Float -> Rect+shrink self dLeft dTop dRight dBottom =+    Rect (left self + dLeft) (top self + dTop)+         (right self - dRight) (bottom self - dBottom)+shrink1 :: Rect -> Float -> Rect+shrink1 self d = shrink self d d d d++renderRects :: (MonadIO m, MonadIO n) =>+        n (RectStyle Texture -> Rects -> M44 Float -> m ())+renderRects = do+    bg <- renderBackgrounds+    frame <- renderBorder+    return $ \style rects mat -> do+        bg (backgrounds style) rects mat+        frame (border style) rects mat++styleResolveImages :: Atlas -> RectStyle Text -> RectStyle Texture+styleResolveImages atlas self =+    let textures = map atlasLookup' $ image $ backgrounds self+    in self { backgrounds = (backgrounds self) { image = textures } }+  where+    atlasLookup' None = None+    atlasLookup' (Img path) = Img $ atlasLookup path atlas+    atlasLookup' (Linear a b) = Linear a b+    atlasLookup' (Radial a b cc d) = Radial a b cc d+    atlasLookup' (Conical a b cc) = Conical a b cc++atlasFromStyles :: MonadIO m =>+        (Text -> IO DynamicImage) -> [RectStyle Text] -> m Atlas+atlasFromStyles cb styles =+    buildAtlas cb $ nub  [path | s <- styles, Img path <- image $ backgrounds s]

@@ -0,0 +1,276 @@+module Graphics.Rendering.Rect.Backgrounds(Backgrounds(..), Pattern(..),+    RadialShape(..), Resize(..), Length(..), Extent(..),+    resolveSize, renderBackgrounds) where++import Graphics.Rendering.Rect.CSS.Backgrounds+import Graphics.Rendering.Rect.Types+import Graphics.Rendering.Rect.Image (Texture(texSize), textureSetRepeat)+import qualified Data.ByteString.Char8 as B8+import Linear (M44, V2(..))++import Control.Monad.IO.Class (MonadIO(..))+import Data.Maybe (fromMaybe, listToMaybe)+import Control.Monad (forM)++baseFragmentShader :: B8.ByteString+baseFragmentShader = B8.pack $ unlines [+    "#version 330 core",+    "out vec4 fcolour;",+    "uniform vec4 colour;",+    "void main() { fcolour = colour; }"+  ]++imageFragmentShader :: B8.ByteString+imageFragmentShader = B8.pack $ unlines [+    "#version 330 core",+    "in vec2 coord;",+    "out vec4 fcolour;",+    "uniform vec2 pos;",+    "uniform sampler2D image;",+    "uniform vec2 size;",+    "void main() { fcolour = texture(image, coord/size - pos/size); }"+  ]++linearFragmentShader :: B8.ByteString+linearFragmentShader = B8.pack $ unlines [+    "#version 330 core",+    "in vec2 coord;",+    "out vec4 fcolour;",+    "uniform vec2 size;",+    "uniform vec4 stops[10];",+    "uniform float stopPoints[10];",+    "uniform int nStops;",+    "uniform float angle;",+    "",+    "void main() {",+    "   vec2 pos = coord/size;", -- Range 0..1+    "   pos -= 0.5; pos *= 2;", -- Range -1..1+    "   float a = pos.x*sin(angle) + pos.y*-cos(angle);", -- Range -1..1+    "   a /= 2; a += 0.5;", -- Range 0..1+    "",+    "   int i = 0;",+    -- Workaround for buggy GPU drivers on test machine.+    "   if (1 < nStops - 1 && a > stopPoints[1]) i = 1;",+    "   if (2 < nStops - 1 && a > stopPoints[2]) i = 2;",+    "   if (3 < nStops - 1 && a > stopPoints[3]) i = 3;",+    "   if (4 < nStops - 1 && a > stopPoints[4]) i = 4;",+    "   if (5 < nStops - 1 && a > stopPoints[5]) i = 5;",+    "   if (6 < nStops - 1 && a > stopPoints[6]) i = 6;",+    "   if (7 < nStops - 1 && a > stopPoints[7]) i = 7;",+    "   if (8 < nStops - 1 && a > stopPoints[8]) i = 8;",+    "",+    "   a = smoothstep(stopPoints[i], stopPoints[i+1], a);",+    "   fcolour = mix(stops[i], stops[i+1], a);",+    "}"+  ]++radialFragmentShader :: B8.ByteString+radialFragmentShader = B8.pack $ unlines [+    "#version 330 core",+    "in vec2 coord;",+    "out vec4 fcolour;",+    "uniform vec2 size;",+    "uniform vec2 extent;",+    "uniform vec2 center;",+    "uniform vec4 stops[10];",+    "uniform float stopPoints[10];",+    "uniform int nStops;",+    "",+    "void main() {",+    "   float a = distance(coord/extent, center/size) * 2;",+    "",+    "   int i = 0;",+    -- Workaround for buggy GPU drivers on test machine.+    "   if (1 < nStops - 1 && a > stopPoints[1]) i = 1;",+    "   if (2 < nStops - 1 && a > stopPoints[2]) i = 2;",+    "   if (3 < nStops - 1 && a > stopPoints[3]) i = 3;",+    "   if (4 < nStops - 1 && a > stopPoints[4]) i = 4;",+    "   if (5 < nStops - 1 && a > stopPoints[5]) i = 5;",+    "   if (6 < nStops - 1 && a > stopPoints[6]) i = 6;",+    "   if (7 < nStops - 1 && a > stopPoints[7]) i = 7;",+    "   if (8 < nStops - 1 && a > stopPoints[8]) i = 8;",+    "",+    "   a = smoothstep(stopPoints[i], stopPoints[i+1], a);",+    "   fcolour = mix(stops[i], stops[i+1], a);",+    "}"+  ]+circleFragmentShader :: B8.ByteString+circleFragmentShader = B8.pack $ unlines [+    "#version 330 core",+    "in vec2 coord;",+    "out vec4 fcolour;",+    "uniform vec2 center;",+    "uniform float radius;",+    "uniform vec4 stops[10];",+    "uniform float stopPoints[10];",+    "uniform int nStops;",+    "",+    "void main() {",+    "   float a = distance(coord, center)/radius;",+    "",+    "   int i = 0;",+    -- Workaround for buggy GPU drivers on test machine.+    "   if (1 < nStops - 1 && a > stopPoints[1]) i = 1;",+    "   if (2 < nStops - 1 && a > stopPoints[2]) i = 2;",+    "   if (3 < nStops - 1 && a > stopPoints[3]) i = 3;",+    "   if (4 < nStops - 1 && a > stopPoints[4]) i = 4;",+    "   if (5 < nStops - 1 && a > stopPoints[5]) i = 5;",+    "   if (6 < nStops - 1 && a > stopPoints[6]) i = 6;",+    "   if (7 < nStops - 1 && a > stopPoints[7]) i = 7;",+    "   if (8 < nStops - 1 && a > stopPoints[8]) i = 8;",+    "",+    "   a = smoothstep(stopPoints[i], stopPoints[i+1], a);",+    "   fcolour = mix(stops[i], stops[i+1], a);",+    "}"+  ]++conicFragmentShader :: B8.ByteString+conicFragmentShader = B8.pack $ unlines [+    "#version 330 core",+    "in vec2 coord;",+    "out vec4 fcolour;",+    "uniform vec2 center;",+    "uniform float angle;",+    "uniform vec4 stops[10];",+    "uniform float stopPoints[10];",+    "uniform int nStops;",+    "",+    "void main() {",+    "   vec2 v = coord - center;",+    "   float a = atan(v.x, -v.y) - angle;",+    "   float turn = 2*radians(180);",+    "   a = fract(a/turn);",+    "",+    "   int i = 0;",+    -- Workaround for buggy GPU drivers on test machine.+    "   if (1 < nStops - 1 && a > stopPoints[1]) i = 1;",+    "   if (2 < nStops - 1 && a > stopPoints[2]) i = 2;",+    "   if (3 < nStops - 1 && a > stopPoints[3]) i = 3;",+    "   if (4 < nStops - 1 && a > stopPoints[4]) i = 4;",+    "   if (5 < nStops - 1 && a > stopPoints[5]) i = 5;",+    "   if (6 < nStops - 1 && a > stopPoints[6]) i = 6;",+    "   if (7 < nStops - 1 && a > stopPoints[7]) i = 7;",+    "   if (8 < nStops - 1 && a > stopPoints[8]) i = 8;",+    "",+    "   a = smoothstep(stopPoints[i], stopPoints[i+1], a);",+    "   fcolour = mix(stops[i], stops[i+1], a);",+    "}"+  ]++renderBackgrounds :: (MonadIO m, MonadIO n) =>+    n (Backgrounds Texture -> Rects -> M44 Float -> m ())+renderBackgrounds = do+    base <- renderRectWith baseFragmentShader ["colour"]+    layer <- renderRectWith imageFragmentShader ["size", "pos"]+    linear <- renderRectWith linearFragmentShader ["size", "angle",+            "stops", "stopPoints", "nStops"]+    ellipse <- renderRectWith radialFragmentShader ["size", "extent", "center",+            "stops", "stopPoints", "nStops"]+    circle <- renderRectWith circleFragmentShader ["center", "radius",+            "stops", "stopPoints", "nStops"]+    conic <- renderRectWith conicFragmentShader ["center", "angle",+            "stops", "stopPoints", "nStops"]+    return $ \self a b -> do+        base [] [c $ background self] (headDef borderBox $ clip self)+                (headDef paddingBox $ origin self) a b+        let layers = image self `zip` (clip self ++ repeat borderBox)+                `zip` (bgSize self ++ repeat (Size Auto Auto))+                `zip` (origin self ++ repeat paddingBox)+                `zip` (bgPos self ++ repeat (Absolute 0, Absolute 0))+                `zip` (bgRepeat self ++ repeat (True, True))+        _<-forM layers $ \(((((pat0, clip0), size0), origin0), pos0), repeat0) ->+          case pat0 of+            None -> return ()+            Img img0 -> do+                let sz = resolveSize (size $ clip0 a) (texSize img0) size0+                let pos' = (v2$l2f' pos0$size$clip0 a) - (v2$l2f' pos0 sz)+                textureSetRepeat img0 repeat0+                layer [img0] [u $ v2 sz, u pos'] clip0 origin0 a b+            Linear angle stops -> let size' = size $ clip0 a in linear [] [+                    u $ v2 $ size', u angle, cs 10 $ map fst stops,+                    us $ ls2fs size' $ map snd $ take 10 stops, u $ length stops+                ] clip0 origin0 a b+            -- FIXME: Incorporate resolveEllipseExtent without messing up center+            Radial Ellipse ext org stops -> let sz@(_,h) = size $ clip0 a in+                let (org', ext') = resolveEllipseExtent sz org ext in ellipse [] [+                    u $ v2 sz, u $ v2 ext', u $ v2 org', cs 10 $ map fst stops,+                    us $ ls2fs (0,h/2) $ map snd $ take 10 stops, u $ length stops+                ] clip0 origin0 a b+            Radial Circle ext org stops -> let sz@(w,h) = size $ clip0 a+                in let (org', r) = resolveCircleExtent sz org ext in circle [] [+                    u $ v2 org', u r, cs 10 $ map fst stops,+                    us $ ls2fs (0,min w h/2) $ map snd $ take 10 stops,+                    u $ length stops+                ] clip0 origin0 a b+            Conical angle org stops -> let sz = size $ clip0 a in conic [] [+                    u $ v2 $ l2f' org sz, u angle, cs 10 $ map fst stops,+                    us $ ls2fs (0,2*pi) $ map snd $ take 10 stops, u $ length stops+                ] clip0 origin0 a b+        return ()++headDef :: c -> [c] -> c+headDef def = fromMaybe def . listToMaybe+v2 :: (a, a) -> V2 a+v2 = uncurry V2+-- Easier to express this algorithm on CPU-side...+ls2fs :: (Float, Float) -> [Length] -> [Float]+ls2fs (_,h) ls = resolveAutos 0 $ inner True 0 ls+  where+    -- https://drafts.csswg.org/css-images/#color-stop-fixup Step 1.+    inner True _ (Auto:ls') = Scale 0:inner False 0 ls'+    inner _ _ [Auto] = [Scale 1]+    -- Step 2+    inner _ prev (Scale x:ls') | x < prev = Scale prev:inner False prev ls'+    inner _ prev (Absolute x:ls') | x/h < prev = Scale prev:inner False prev ls'+    inner _ _ (Scale x:ls') = Scale x:inner False x ls'+    inner _ _ (Absolute x:ls') = Absolute x:inner False (x/h) ls'+    inner _ prev (Auto:ls') = Auto:inner False prev ls'+    inner _ _ [] = []+    -- Step 3+    resolveAutos :: Float -> [Length] -> [Float]+    resolveAutos _ (Scale x:ls') = x:resolveAutos x ls'+    resolveAutos _ (Absolute x:ls') = (x/h):resolveAutos (x/h) ls'+    resolveAutos _ [] = []+    resolveAutos prev ls0 = [prev + succ i*grad | i <- [0..n - 1]] ++ fs+      where+        (autos, ls') = span (==Auto) ls0+        n = toEnum $ length autos+        fs = resolveAutos 0 ls' -- Doesn't matter if prev's in another branch...+        next | (x:_) <- fs = x+            | otherwise = 1 -- Step 1 should've taken care of this...+        grad = (next - prev)/(n + 1)++l2f :: Length -> Float -> Float+l2f Auto x = x/2+l2f (Scale x) y = x*y+l2f (Absolute x) _ = x+l2f' :: (Length, Length) -> (Float, Float) -> (Float, Float)+l2f' (x,y) (w,h) = (l2f x w, l2f y h)++resolveEllipseExtent :: (Float, Float) -> (Length, Length) -> Extent ->+    ((Float, Float), (Float, Float))+resolveEllipseExtent sz@(x',y') pos ext = ((x, y), inner ext)+  where+    (x,y) = l2f' pos sz+    horiz = [x, x' - x]+    vert = [y, y' - y]+    inner (Extent s t) = (l2f s x, l2f t y)+    -- FIXME: How to calculate closest/farthest-corner?+    -- Spec just says keep this aspect ratio.+    inner ClosestCorner = (minimum horiz * 2, minimum vert * 2)+    inner ClosestSide = (minimum horiz * 2, minimum vert * 2)+    inner FarthestCorner = (maximum horiz * 2, maximum vert * 2)+    inner FarthestSide = (maximum horiz * 2, maximum vert * 2)+resolveCircleExtent :: (Float, Float) -> (Length, Length) -> Extent ->+    ((Float, Float), Float)+resolveCircleExtent sz@(x',y') pos ext = ((x, y), inner ext)+  where+    (x,y) = l2f' pos sz+    sides = [x, x' - x, y, y' - y]+    corners = [hypot x y, hypot x $ y'-y, hypot y $ x'-x, hypot (x'-x) (y'-y)]+    hypot a b = sqrt $ a*a + b*b+    inner (Extent a _) = l2f a y -- Should be absolute...+    inner ClosestCorner = minimum corners+    inner ClosestSide = minimum sides+    inner FarthestCorner = maximum corners+    inner FarthestSide = maximum sides

@@ -0,0 +1,99 @@+module Graphics.Rendering.Rect.Border(renderBorder, Border(..), BorderStyle(..),+        topColour, rightColour, bottomColour, leftColour) where++import Graphics.Rendering.Rect.CSS.Border+import Graphics.Rendering.Rect.Types+import qualified Data.ByteString.Char8 as B8+import Control.Monad.IO.Class (MonadIO(..))+import Linear (M44)++borderFragmentShader :: B8.ByteString+borderFragmentShader = B8.pack $ unlines [+    "#version 330 core",+    "uniform float widths[4];",+    "uniform vec4 colours[4];",+    "uniform int styles[5];",+    "uniform vec2 boxSize;",+    "in vec2 coord;",+    "out vec4 fcolour;",+    "",+    "const int TOP = 0;",+    "const int RIGHT = 1;",+    "const int BOTTOM = 2;",+    "const int LEFT = 3;",+    "const int NONE = 4;",+    "",+    "const int NOBORDER = 0;",+    "const int SOLID = 1;",+    "const int DASHED = 2;",+    "const int DOTTED = 3;",+    "const int DOUBLE = 4;",+    "const int GROOVE = 5;",+    "const int RIDGE = 6;",+    "const int INSET = 7;",+    "const int OUTSET = 8;",+    "",+    "bool inTrap(float x, float y, float width, int height, int left, int right) {",+    "   float a = y/widths[height];",+    "   return a*widths[left] <= x && x <= width - widths[right]*a;",+    "}",+    "",+    "void main() {",+    "   int side = NONE;",+    "   if (coord.y < abs(widths[TOP]) &&",+    "           inTrap(coord.x, coord.y, boxSize.x, TOP, LEFT, RIGHT))",+    "       side = TOP;",+    "   else if (coord.x < abs(widths[LEFT]) &&",+    "           inTrap(coord.y, coord.x, boxSize.y, LEFT, TOP, BOTTOM))",+    "       side = LEFT;",+    "   else if (boxSize.x - coord.x < abs(widths[RIGHT]) &&",+    "           inTrap(coord.y, boxSize.x-coord.x, boxSize.y, RIGHT,TOP,BOTTOM))",+    "       side = RIGHT;",+    "   else if (boxSize.y - coord.y < abs(widths[BOTTOM])) side = BOTTOM;",+    "",+    "   vec2 pos = coord;",+    "   if (side == RIGHT || side == BOTTOM) pos = boxSize - coord;",+    "   if (side == LEFT || side == RIGHT) pos = pos.yx;",+    "",+    "   int segment = int(floor(pos.x/widths[side]/2));",+    "   float width = widths[side];",+    "   vec2 dotCenter = vec2(segment*width*2 + width, width/2);",+    "   int stroke3 = int(floor(3*pos.y/widths[side]));",+    "   int stroke = int(floor(2*pos.y/widths[side]));",+    "   bool topleft = side == TOP || side == LEFT;",+    "   if (!topleft) stroke = abs(1 - stroke);",+    "   if (styles[side] == SOLID) fcolour = colours[side];",+    "   else if (styles[side] == DASHED)",+    "       fcolour = segment % 2 == 0 ? colours[side] : vec4(0);",+    "   else if (styles[side] == DOTTED)",+    "       fcolour = distance(pos, dotCenter) < widths[side]/2 ?",+    "               colours[side] : vec4(0);",+    "   else if (styles[side] == DOUBLE && stroke3 != 1) fcolour = colours[side];",+    "   else if (styles[side] == GROOVE)",+    "       fcolour = colours[side] + vec4(stroke == 0 ? -0.1 : +0.1);",+    "   else if (styles[side] == RIDGE)",+    "       fcolour = colours[side] + vec4(stroke == 0 ? +0.1 : -0.1);",+    "   else if (styles[side] == INSET)",+    "       fcolour = colours[side] + vec4(topleft ? -0.2 : +0.2);",+    "   else if (styles[side] == OUTSET)",+    "       fcolour = colours[side] + vec4(topleft ? +0.2 : -0.2);",+    "   else fcolour = vec4(0.0);",+    "}"+  ]++renderBorder :: (MonadIO m, MonadIO n) => n (Border -> Rects -> M44 Float -> m ())+renderBorder = do+    inner <- renderRectWith borderFragmentShader [+            "widths[0]", "widths[1]", "widths[2]", "widths[3]",+            "colours[0]", "colours[1]", "colours[2]", "colours[3]",+            "styles[0]", "styles[1]", "styles[2]", "styles[3]", "styles[4]"]+    return $ \self rects -> let (b, p) = (borderBox rects, paddingBox rects)+        in inner [] [+            u $ top p - top b, u $ right b - right p,+            u $ bottom b - bottom p, u $ left p - left b,+            c $ topColour self, c $ rightColour self,+            c $ bottomColour self, c $ leftColour self,+            u $ fromEnum $ topStyle self, u $ fromEnum $ rightStyle self,+            u $ fromEnum $ bottomStyle self, u $ fromEnum $ leftStyle self,+            u (0 :: Int)+        ] borderBox borderBox rects

@@ -0,0 +1,42 @@+{-# LANGUAGE OverloadedStrings, RecordWildCards, FlexibleInstances #-}+module Graphics.Rendering.Rect.CSS(RectStyle(..), colour, border) where++import Stylist (PropertyParser(..))+import Graphics.Rendering.Rect.CSS.Colour (ColourPallet(foreground))+import Graphics.Rendering.Rect.CSS.Backgrounds (Backgrounds(..))+import Graphics.Rendering.Rect.CSS.Border (Border(..))+import Data.Text (Text)+import Data.Colour(AlphaColour)++data RectStyle img = RectStyle {+    colours :: ColourPallet,+    backgrounds :: Backgrounds img,+    border' :: Border+} deriving (Eq, Show, Read)+colour :: RectStyle img -> AlphaColour Float+colour = foreground . colours+border :: RectStyle img -> Border+border self = (border' self) { borderPallet = colours self }++instance PropertyParser (RectStyle Text) where+    temp = RectStyle { colours = temp, backgrounds = temp, border' = temp }+    inherit RectStyle {..} = RectStyle {+        colours = inherit colours, backgrounds = temp, border' = temp+    }+    priority RectStyle {..} =+        priority colours ++ priority backgrounds ++ priority border'++    shorthand self key value+        | ret@(_:_) <- shorthand (backgrounds self) key value = ret+        | ret@(_:_) <- shorthand (border self) key value = ret+        | Just _ <- longhand self self key value = [(key, value)]+        | otherwise = []+    longhand parent self key value+        | Just ret <- longhand (backgrounds parent) { pallet = colours self }+                (backgrounds self) { pallet = colours self } key value =+            Just self { backgrounds = ret }+        | Just ret <- longhand (colours parent) (colours self) key value =+            Just self { colours = ret }+        | Just ret <- longhand (border parent) (border self) key value =+            Just self { border' = ret }+        | otherwise = Nothing

@@ -0,0 +1,333 @@+{-# LANGUAGE OverloadedStrings, FlexibleInstances #-}+module Graphics.Rendering.Rect.CSS.Backgrounds (Backgrounds(..),+    Pattern(..), RadialShape(..), Extent(..),+    Resize(..), Length(..), resolveSize) where++import Stylist (PropertyParser(..), parseUnorderedShorthand, parseOperands)+import Data.CSS.Syntax.Tokens (Token(..), NumericValue(..))+import Data.Maybe (isJust, catMaybes)+import Data.Text (Text)+import Data.Scientific (scientific, toRealFloat)++import Graphics.Rendering.Rect.CSS.Colour (ColourPallet, parseColour)+import Data.Colour (AlphaColour, transparent)+import Graphics.Rendering.Rect.Types (Rects(..), Rect(..))++data Backgrounds img = Backgrounds {+    pallet :: ColourPallet,+    background :: C,+    clip :: [Rects -> Rect],+    origin :: [Rects -> Rect],+    image :: [Pattern img],+    bgPos :: [(Length, Length)],+    bgSize :: [Resize],+    bgRepeat :: [(Bool, Bool)]+} deriving (Eq, Show, Read)++type C = AlphaColour Float++data Pattern img = None | Img img | Linear Float [(C, Length)]+    | Radial RadialShape Extent (Length, Length) [(C, Length)]+    | Conical Float (Length, Length) [(C, Length)]+    deriving (Eq, Show, Read)+data RadialShape = Circle | Ellipse deriving (Eq, Show, Read)+data Extent = Extent Length Length | ClosestCorner+    | ClosestSide | FarthestCorner | FarthestSide deriving (Eq, Show, Read)++-- We need to resolve images before we can compute the actual lengths!+data Resize = Cover | Contain | Size Length Length deriving (Eq, Show, Read)+data Length = Absolute Float | Scale Float | Auto deriving (Eq, Show, Read)++instance PropertyParser (Backgrounds Text) where+    temp = Backgrounds {+        pallet = temp, background = transparent, clip = [borderBox],+        image = [None], bgSize = [Size Auto Auto], origin = [paddingBox],+        bgPos = [(Absolute 0, Absolute 0)], bgRepeat = [(True, True)]+      }+    inherit _ = temp+    priority _ = []++    longhand _ self@Backgrounds{ pallet = c } "background-color" toks+        | Just ([], val) <- parseColour c toks = Just self { background = val }+    longhand _ self "background-clip" t | val@(_:_) <- parseCSSList box t =+        Just self { clip = reverse val }+    longhand _ self@Backgrounds { pallet = pp } "background-image" t+        | val@(_:_) <- parseCSSList inner t = Just self { image = reverse val }+      where+        inner [Ident "none"] = Just None+        inner [Ident "initial"] = Just None+        inner [Url ret] = Just $ Img ret+        inner [Function "url", String ret, RightParen] = Just $ Img ret+        inner (Function "linear-gradient":toks)+            | Just cs@(_:_:_)<-colourStops pp (Comma:toks) = Just $ Linear pi cs+        inner (Function "linear-gradient":Dimension _ x unit:toks)+            | Just s <- lookup unit angularUnits,+                Just cs@(_:_:_) <- colourStops pp toks = Just $ Linear (f x*s) cs+        inner (Function "linear-gradient":Ident "to":Ident a:Ident b:toks)+            | Just angle<-corner a b, Just stops@(_:_:_)<-colourStops pp toks =+                Just $ Linear angle stops+            | Just angle<-corner b a, Just stops@(_:_:_)<-colourStops pp toks =+                Just $ Linear angle stops+          where+            corner "top" "right" = Just $ 0.25*pi+            corner "bottom" "right" = Just $ 0.75*pi+            corner "bottom" "left" = Just $ 1.25*pi+            corner "top" "left" = Just $ 1.75*pi+            corner _ _ = Nothing+        inner (Function "linear-gradient":Ident "to":Ident side:toks)+            | Just angle <- lookup side [+                ("top", 0), ("right", pi/2), ("bottom", pi), ("left", pi*1.5)],+                Just cs@(_:_:_) <- colourStops pp toks = Just $ Linear angle cs+        inner (Function "radial-gradient":toks)+            | Just cs@(_:_:_) <- colourStops pp (Comma:toks) =+                Just $ Radial Ellipse FarthestCorner center cs+            | (shp, org, ext, ts) <- radArgs toks,+                Just cs@(_:_:_) <- colourStops pp ts = Just $ Radial shp ext org cs+          where+            radArgs (Ident s:Ident "at":ts) | Just shape <- radShape s,+                    Just (org, ts') <- position ts =+                (shape, org, FarthestCorner, ts')+            radArgs (Ident "at":ts) | Just (org, ts') <- position ts =+                (Ellipse, org, FarthestCorner, ts')+            radArgs (Ident "circle":Ident "at":ts)+                | Just (org, ts') <- position ts = (Circle,org,FarthestCorner,ts')+            radArgs (Ident "circle":ts)+                | Just (_, Ident "at":ts') <- circleExt ts,+                        Just (org, stops) <- position ts' =+                    (Circle, org, FarthestCorner, stops)+                | Just (_,ts')<-circleExt ts=(Circle,center,FarthestCorner,ts')+                | otherwise = (Circle, center, FarthestCorner, ts)+            radArgs (Ident "ellipse":Ident "at":ts)+                | Just (org,ts')<-position ts=(Ellipse,org,FarthestCorner,ts')+            radArgs (Ident "ellipse":ts)+                | Just (_, Ident "at":ts') <- ellipseExt ts,+                        Just (org, stops) <- position ts' =+                    (Ellipse, org, FarthestCorner, stops)+                | Just (_,ts')<-ellipseExt ts=(Ellipse,center,FarthestCorner,ts')+                | otherwise = (Ellipse, center, FarthestCorner, ts)+            radArgs ts | Just (_, Ident "at":ts') <- ellipseExt ts,+                        Just (org, stops) <- position ts' =+                    (Ellipse, org, FarthestCorner, stops)+                | Just (_, Ident "ellipse":Ident "at":ts') <- ellipseExt ts,+                        Just (org, stops) <- position ts' =+                    (Ellipse, org, FarthestCorner, stops)+                | Just (_, Ident "ellipse":ts') <- ellipseExt ts =+                    (Ellipse, center, FarthestCorner, ts')+                | Just (_, Ident "circle":Ident "at":ts') <- circleExt ts,+                        Just (org, stops) <- position ts' =+                    (Circle, org, FarthestCorner, stops)+                | Just (_, Ident "circle":ts') <- circleExt ts =+                    (Circle, center, FarthestCorner, ts')+                | otherwise = (Ellipse, center, FarthestCorner, ts)+            radShape "circle" = Just Circle+            radShape "ellipse" = Just Ellipse+            radShape _ = Nothing+            radExt (Ident "closest-corner":ts) = Just (ClosestCorner, ts)+            radExt (Ident "closest-side":ts) = Just (ClosestSide, ts)+            radExt (Ident "farthest-corner":ts) = Just (FarthestCorner, ts)+            radExt (Ident "farthest-side":ts) = Just (FarthestSide, ts)+            radExt _ = Nothing+            ellipseExt ts | Just ret <- radExt ts = Just ret+            ellipseExt (Percentage _ x:Percentage _ y:ts) =+                Just (p' x `Extent` p' y, ts)+            ellipseExt (Percentage _ x:Dimension _ y "px":ts) =+                Just (p' x `Extent` f' y, ts)+            ellipseExt (Dimension _ x "px":Percentage _ y:ts) =+                Just (f' x `Extent` p' y, ts)+            ellipseExt (Dimension _ x "px":Dimension _ y "px":ts) =+                Just (f' x `Extent` p' y, ts)+            ellipseExt _ = Nothing+            circleExt (Dimension _ x "px":ts) = Just (f' x `Extent` f' x, ts)+            circleExt ts = radExt ts+        -- NOTE: Not implementing colourspaces yet...+        inner (Function "conic-gradient":Ident "from":Dimension _ x unit:+                    Ident "at":ts)+            | Just (org, ts') <- position ts, Just s <- lookup unit angularUnits,+              Just stops@(_:_:_) <- colourStops pp ts' =+                Just $ Conical (f x*s) org stops+        inner (Function "conic-gradient":Ident "from":Dimension _ x unit:ts)+            | Just s <- lookup unit angularUnits,+              Just stops@(_:_:_) <- colourStops pp ts =+                Just $ Conical (f x*s) center stops+        inner (Function "conic-gradient":Ident "at":ts)+            | Just (org, ts') <- position ts,+                Just cs@(_:_:_) <- colourStops pp ts' = Just $ Conical 0 org cs+        inner (Function "conic-gradient":ts)+            | Just stops@(_:_:_) <- colourStops pp (Comma:ts) =+                Just $ Conical 0 center stops+        inner _ = Nothing++        angularUnits = [("deg",pi/180),("grad",pi/200),("rad",1),("turn",2*pi)]+        center = (Scale 0.5, Scale 0.5)+    longhand _ self "background-origin" t | val@(_:_) <- parseCSSList box t =+        Just self { origin = reverse val }+    longhand _ self "background-position" t | val@(_:_) <- parseCSSList position t,+        all (null . snd) val = Just self { bgPos = reverse $ map fst val }+    longhand _ self "background-repeat" t | val@(_:_) <- parseCSSList inner t =+        Just self { bgRepeat = reverse val }+      where+        inner [Ident "initial"] = Just (True, True)+        inner [Ident "repeat-x"] = Just (True, False)+        inner [Ident "repeat-y"] = Just (False, True)+        inner [x] | Just y <- inner' x = Just (y, y)+        inner [x, y] | Just x' <- inner' x, Just y' <- inner' y = Just (x', y')+        inner _ = Nothing+        inner' (Ident "repeat") = Just True+        inner' (Ident "no-repeat") = Just False+        inner' _ = Nothing+    longhand _ self "background-size" t | val@(_:_) <- parseCSSList inner t =+        Just self { bgSize = reverse val }+      where -- TODO: Add shorthand support, after background-position.+        inner [x, y] | Just a <- l x, Just b <- l y = Just $ Size a b+        inner [Ident "contain"] = Just Contain+        inner [Ident "cover"] = Just Cover+        inner [Ident "auto"] = Just $ Size Auto Auto+        inner [Ident "initial"] = Just $ Size Auto Auto+        inner _ = Nothing+        -- NOTE: Leave lowering other units to CatTrap.+        l (Ident "auto") = Just Auto+        l (Dimension _ x "px") = Just $ Absolute $ f x+        l (Percentage _ x) = Just $ Scale $ p x+        l _ = Nothing+    longhand _ _ _ _ = Nothing++    -- The multi-layered shorthand is one source of parsing complexity.+    shorthand self "background" t = catProps $ reverse $ parseCSSList inner t+      where+        catProps [] = []+        catProps (props:pss)+            | Just [Ident "initial"] <- "background-color" `lookup` catProps pss =+                map (catProp $ catProps pss) props+            | otherwise = [] -- Only allow background-color in bottommost layer.+        catProp _ ret@("background-color", _) = ret+        catProp bases (key, val)+            | Just base <- key `lookup` bases = (key, base ++ Comma:val)+            -- Shouldn't happen, `inner` expands all props at least to "initial"!+            | otherwise = (key, val)+        inner toks | ret@(_:_) <- parseUnorderedShorthand self [+                "background-color", "background-clip", "background-image",+                "background-origin", "background-position"+              ] toks = Just ret+          | otherwise = Nothing+    shorthand self key val | Just _ <- longhand self self key val = [(key, val)]+        | otherwise = []++box :: [Token] -> Maybe (Rects -> Rect)+box [Ident "content-box"] = Just contentBox+box [Ident "padding-box"] = Just paddingBox+box [Ident "border-box"] = Just borderBox+box [Ident "initial"] = Just borderBox -- To aid shorthand implementation.+box _ = Nothing++position :: [Token] -> Maybe ((Length, Length), [Token])+position (x:y:ts) = position' x y ts <* position' y x ts <* position' x x (y:ts)+position [x] = position' x x []+position _ = Nothing+position' :: Token -> Token -> [Token] -> Maybe ((Length, Length), [Token])+position' x y ts = case ((case x of+        Ident "left" -> Scale 0+        Ident "center" -> Scale 0.5+        Ident "right" -> Scale 1+        Percentage _ a -> p' a+        Dimension _ a "px" -> f' a+        _ -> Auto,+    case y of+        Ident "top" -> Scale 0+        Ident "center" -> Scale 0.5+        Ident "bottom" -> Scale 1+        Percentage _ a -> p' a+        Dimension _ a "px" -> f' a+        _ -> Auto),+    ts) of+        ((Auto, _), _) -> Nothing+        ((_, Auto), _) -> Nothing+        ret -> Just ret++colourStops :: ColourPallet+        -> [Token] -> Maybe [(AlphaColour Float, Length)]+colourStops _ [RightParen] = Just []+colourStops cs (Comma:toks)+    | Just (Percentage _ x:toks', c) <- parseColour cs toks,+        Just ret <- colourStops cs toks' = Just $ (c, Scale $ p x):ret+    | Just (Dimension _ x "px":toks', c) <- parseColour cs toks,+        Just ret <- colourStops cs toks' = Just $ (c, Absolute $ f x):ret+    | Just (toks', c) <- parseColour cs toks,+        Just ret <- colourStops cs toks' = Just $ (c, Auto):ret+colourStops cs (Comma:Percentage _ x:toks)+    | Just (toks', c) <- parseColour cs toks,+        Just ret <- colourStops cs toks' = Just $ (c, Scale $ p x):ret+colourStops cs (Comma:Dimension _ x "px":toks)+    | Just (toks', c) <- parseColour cs toks,+        Just ret <- colourStops cs toks' = Just $ (c, Absolute $ f x):ret+colourStops _ _ = Nothing++parseCSSList :: ([Token] -> Maybe a) -> [Token] -> [a]+parseCSSList cb toks | all isJust ret = catMaybes ret+    | otherwise = []+  where ret = map cb $ map concat $ splitList [Comma] $ parseOperands toks++f :: NumericValue -> Float+f (NVInteger x) = fromInteger x+f (NVNumber x) = toRealFloat x+p :: NumericValue -> Float+p (NVInteger x) = fromInteger x / 100+-- Do the division while we're in base-10!+p (NVNumber x) = toRealFloat (x/scientific 1 2)+p' :: NumericValue -> Length+p' = Scale . p+f' :: NumericValue -> Length+f' = Absolute . f++------+--- Utils taken from HappStack+------++-- | Repeadly splits a list by the provided separator and collects the results+splitList :: Eq a => a -> [a] -> [[a]]+splitList _   [] = []+splitList sep list = h:splitList sep t+        where (h,t)=split (==sep) list++-- | Split is like break, but the matching element is dropped.+split :: (a -> Bool) -> [a] -> ([a], [a])+split filt s = (x,y)+        where+        (x,y')=break filt s+        y = if null y' then [] else tail y'++------+--- Dynamically-computed properties+------++resolveSize :: (Float, Float) -> (Float, Float) -> Resize -> (Float, Float)+resolveSize (owidth, oheight) (width, height) Contain+    | width > owidth, height*sw > oheight, height > width = (width*sh, height*sh)+    | width > owidth = (width*sw, height*sw)+    | height > oheight = (width*sh, height*sh)+    | height > width = (width*sw, height*sw)+    | otherwise = (width*sh, height*sh)+  where+    sh = oheight/height+    sw = owidth/width+resolveSize (owidth, oheight) (width, height) Cover+    | owidth > width, oheight > height*sw = (width*sh, height*sh)+    | oheight > height, owidth > width*sh = (width*sw, height*sw)+    | owidth > width = (width*sw, height*sw)+    | oheight > height = (width*sh, height*sh)+    | oheight > height*sw = (width*sh, height*sh)+    | owidth > width*sh = (width*sw, height*sw)+    | height > width = (width*sw, height*sw)+    | otherwise = (width*sh, height*sh)+  where+    sh = oheight/height+    sw = owidth/width+resolveSize _ ret (Size Auto Auto) = ret+resolveSize _ (width, height) (Size x y) = (x', y')+  where+    x' | Absolute ret <- x = ret+        | Scale s <- x = width*s+        | Auto <- x = y' * width/height+    y' | Absolute ret <- y = ret+        | Scale s <- y = height*s+    -- NOTE: If Auto,Auto case wasn't handled above this'd be an infinite loop.+        | Auto <- y = x' * height/width

@@ -0,0 +1,169 @@+{-# LANGUAGE OverloadedStrings #-}+module Graphics.Rendering.Rect.CSS.Border(Border(..), BorderStyle(..),+    topColour, rightColour, bottomColour, leftColour) where++import Stylist (PropertyParser(..), parseUnorderedShorthand, parseOperands)+import Data.CSS.Syntax.Tokens (Token(..))+import Graphics.Rendering.Rect.CSS.Colour (ColourPallet(foreground), parseColour)+import Data.Colour (AlphaColour)+import Data.Maybe (fromMaybe, isJust)+import Data.Text (Text)++data Border = Border {+    borderPallet :: ColourPallet,+    topStyle :: BorderStyle,+    topColour' :: Maybe (AlphaColour Float),+    rightStyle :: BorderStyle,+    rightColour' :: Maybe (AlphaColour Float),+    bottomStyle :: BorderStyle,+    bottomColour' :: Maybe (AlphaColour Float),+    leftStyle :: BorderStyle,+    leftColour' :: Maybe (AlphaColour Float)+} deriving (Eq, Show, Read)++resolveColour :: Border -> Maybe (AlphaColour Float) -> AlphaColour Float+resolveColour self = fromMaybe $ foreground $ borderPallet self+topColour, rightColour, bottomColour, leftColour :: Border -> AlphaColour Float+topColour self = resolveColour self $ topColour' self+rightColour self = resolveColour self $ rightColour' self+bottomColour self = resolveColour self $ bottomColour' self+leftColour self = resolveColour self $ leftColour' self++data BorderStyle = NoBorder | Solid | Dashed | Dotted | Double+    | Groove | Ridge | Inset | Outset deriving (Eq, Show, Read, Enum)++style :: Token -> Maybe BorderStyle+style (Ident "initial") = Just NoBorder+style (Ident "none") = Just NoBorder+style (Ident "hidden") = Just NoBorder+style (Ident "solid") = Just Solid+style (Ident "dashed") = Just Dashed+style (Ident "dotted") = Just Dotted+style (Ident "double") = Just Double+style (Ident "groove") = Just Groove+style (Ident "ridge") = Just Ridge+style (Ident "inset") = Just Inset+style (Ident "outset") = Just Outset+style _ = Nothing++instance PropertyParser Border where+    temp = Border {+        borderPallet = temp,+        topStyle = NoBorder,+        topColour' = Nothing,+        rightStyle = NoBorder,+        rightColour' = Nothing,+        bottomStyle = NoBorder,+        bottomColour' = Nothing,+        leftStyle = NoBorder,+        leftColour' = Nothing+      }+    inherit = const temp+    priority = const []++    longhand _ s "border-top-style" [t] | Just v <- style t = Just s {topStyle=v}+    longhand _ s "border-right-style" [t] | Just v<-style t=Just s {rightStyle=v}+    longhand _ s "border-bottom-style" [t]|Just v<-style t=Just s {bottomStyle=v}+    longhand _ s "border-left-style" [t] | Just v<-style t = Just s {leftStyle=v}+    longhand _ self@Border { borderPallet = cc } "border-top-color" ts+        | Just ([], v) <- parseColour cc ts = Just self { topColour' = Just v }+    longhand _ self@Border { borderPallet = cc } "border-right-color" ts+        | Just ([], v) <- parseColour cc ts = Just self { rightColour' = Just v }+    longhand _ self@Border { borderPallet = cc } "border-bottom-color" ts+        | Just ([], v) <- parseColour cc ts = Just self { bottomColour' = Just v }+    longhand _ self@Border { borderPallet = cc } "border-left-color" ts+        | Just ([], v) <- parseColour cc ts = Just self { leftColour' = Just v }++    -- Should be handled by caller, but for the sake of shorthands...+    longhand _ self "border-top-width" [Dimension _ _ "px"] = Just self+    longhand _ self "border-right-width" [Dimension _ _ "px"] = Just self+    longhand _ self "border-bottom-width" [Dimension _ _ "px"] = Just self+    longhand _ self "border-left-width" [Dimension _ _ "px"] = Just self+    longhand _ _ _ _ = Nothing++    shorthand self "border-width" toks+        | length x > 0 && length x <= 4, (top:right:bottom:left:_) <- cycle x,+            all (validProp self "border-top-width") x =+                [("border-top-width", top), ("border-right-width", right),+                 ("border-bottom-width", bottom), ("border-left-width", left)]+      where x = parseOperands toks+    -- Define other border shorthands here to properly handle border-widths+    shorthand self "border" toks = parseUnorderedShorthand self [+        "border-color", "border-style", "border-width"] toks+    shorthand self "border-top" toks = parseUnorderedShorthand self [+        "border-top-color", "border-top-style", "border-top-width"] toks+    shorthand self "border-right" toks = parseUnorderedShorthand self [+        "border-right-color", "border-right-style", "border-right-width"] toks+    shorthand self "border-bottom" toks = parseUnorderedShorthand self [+        "border-bottom-color", "border-bottom-style", "border-bottom-width"] toks+    shorthand self "border-left" toks = parseUnorderedShorthand self [+        "border-left-color", "border-left-style", "border-left-width"] toks+    shorthand self "border-inline" toks = parseUnorderedShorthand self [+        "border-inline-color", "border-inline-style", "border-inline-width"] toks+    shorthand self "border-inline-start" toks = parseUnorderedShorthand self [+        "border-inline-start-color", "border-inline-start-style",+        "border-inline-start-width"] toks+    shorthand self "border-inline-end" toks = parseUnorderedShorthand self [+        "border-inline-end-color", "border-inline-end-style",+        "border-inline-end-width"] toks+    shorthand self "border-block" toks = parseUnorderedShorthand self [+        "border-block-color", "border-block-style", "border-block-width"] toks+    shorthand self "border-block-start" toks = parseUnorderedShorthand self [+        "border-block-start-color", "border-block-start-style",+        "border-block-start-width"] toks+    shorthand self "border-block-end" toks = parseUnorderedShorthand self [+        "border-block-end-color", "border-block-end-style",+        "border-block-end-width"] toks+    shorthand self "border-color" toks+        | length x > 0 && length x <= 4, (top:right:bottom:left:_) <- cycle x,+            all (validProp self "border-top-color") x =+                [("border-top-color", top), ("border-right-color", right),+                 ("border-bottom-color", bottom), ("border-left-color", left)]+      where x = parseOperands toks+    shorthand self "border-style" toks+        | length x > 0 && length x <= 4, (top:right:bottom:left:_) <- cycle x,+            all (validProp self "border-top-style") x =+                [("border-top-style", top), ("border-right-style", right),+                 ("border-bottom-style", bottom), ("border-left-style", left)]+      where x = parseOperands toks+    shorthand self "border-width" toks+        | length x > 0 && length x <= 4, (top:right:bottom:left:_) <- cycle x,+            all (validProp self "border-top-width") x =+                [("border-top-width", top), ("border-right-width", right),+                 ("border-bottom-width", bottom), ("border-left-width", left)]+      where x = parseOperands toks+    shorthand self "border-inline-color" toks+        | length x > 0 && length x <= 2, (s:e:_) <- cycle x,+            all (validProp self "border-inline-start-color") x =+                [("border-inline-start-color", s), ("border-inline-end-color", e)]+      where x = parseOperands toks+    shorthand self "border-inline-style" toks+        | length x > 0 && length x <= 2, (s:e:_) <- cycle x,+            all (validProp self "border-inline-start-style") x =+                [("border-inline-start-style", s), ("border-inline-end-style", e)]+      where x = parseOperands toks+    shorthand self "border-inline-width" toks+        | length x > 0 && length x <= 2, (s:e:_) <- cycle x,+            all (validProp self "border-inline-start-width") x =+                [("border-inline-start-width", s), ("border-inline-end-style", e)]+      where x = parseOperands toks+    shorthand self "border-block-color" toks+        | length x > 0 && length x <= 2, (s:e:_) <- cycle x,+            all (validProp self "border-block-start-color") x =+                [("border-block-start-color", s), ("border-block-end-color", e)]+      where x = parseOperands toks+    shorthand self "border-block-style" toks+        | length x > 0 && length x <= 2, (s:e:_) <- cycle x,+            all (validProp self "border-block-start-style") x =+                [("border-block-start-style", s), ("border-block-end-style", e)]+      where x = parseOperands toks+    shorthand self "border-block-width" toks+        | length x > 0 && length x <= 2, (s:e:_) <- cycle x,+            all (validProp self "border-block-start-width") x =+                [("border-block-start-width", s), ("border-block-end-width", e)]+      where x = parseOperands toks+    shorthand self k v | Just _ <- longhand self self k v = [(k, v)]+        | otherwise = []++validProp :: PropertyParser a => a -> Text -> [Token] -> Bool+validProp self key value = isJust $ longhand self self key value

@@ -0,0 +1,310 @@+{-# LANGUAGE OverloadedStrings, PatternSynonyms, ViewPatterns #-}+module Graphics.Rendering.Rect.CSS.Colour(ColourPallet(..), parseColour) where++import Data.Colour (Colour, AlphaColour, withOpacity, opaque, transparent)+import Data.Colour.SRGB (sRGB, sRGB24)+import Data.Colour.Names+import Data.Colour.RGBSpace.HSL (hsl)+import Data.Colour.RGBSpace (uncurryRGB)+import Data.Colour.SRGB.Linear (rgb)++import Data.CSS.Syntax.Tokens (Token(..), NumericValue(..))+import Data.Scientific (toRealFloat)+import qualified Data.Text as Txt++import Data.Word (Word8)+import Data.Char (isHexDigit, toLower)+import Data.List (elemIndex)+import Debug.Trace (trace) -- For warning messages.++import Stylist (PropertyParser(..))++hsl' :: RealFrac a => a -> a -> a -> Colour a+hsl' hue s l = uncurryRGB rgb $ hsl hue s l++data ColourPallet = ColourPallet {+    foreground :: AlphaColour Float,+    accent :: AlphaColour Float+} deriving (Read, Show, Eq)++instance PropertyParser ColourPallet where+    temp = ColourPallet { foreground = opaque black, accent = opaque blue }+    inherit = id+    priority _ = ["color", "accent"]++    longhand _ self "color" [Ident "initial"]=Just self {foreground=opaque black}+    longhand _ self "color" toks | Just ([], val) <- parseColour self toks =+        Just self { foreground = val }+    longhand _ self "accent-color" [Ident kw]+        | kw `elem` ["initial", "auto"] = Just self {accent = opaque blue}+    longhand _ self "accent-color" t | Just ([], val) <- parseColour self t =+        Just self { accent = val }+    longhand _ _ _ _ = Nothing+    shorthand self key val | Just _ <- longhand self self key val = [(key, val)]+        | otherwise = []++parseColour :: ColourPallet -> [Token] -> Maybe ([Token], AlphaColour Float)+parseColour _ (Function "rgb":Percentage _ r:Comma:+        Percentage _ g:Comma:Percentage _ b:RightParen:toks) =+    Just (toks, opaque $ sRGB (pc r) (pc g) (pc b))+parseColour _ (Function "rgba":Percentage _ r:Comma:+        Percentage _ g:Comma:Percentage _ b:Comma:a':RightParen:toks)+    | a' /= Ident "none", Just a <- f' a' =+        Just (toks, sRGB (pc r) (pc g) (pc b) `withOpacity` a)+parseColour _ (Function "rgb":Number _ (NVInteger r):Comma:+        Number _ (NVInteger g):Comma:Number _ (NVInteger b):RightParen:toks) =+    Just (toks, opaque $ sRGB24 (w r) (w g) (w b))+parseColour _ (Function "rgba":Number _ (NVInteger r):Comma:+        Number _ (NVInteger g):Comma:Number _ (NVInteger b):Comma:+        a':RightParen:toks) | a' /= Ident "none", Just a <- f' a' =+    Just (toks, sRGB24 (w r) (w g) (w b) `withOpacity` a)++parseColour _ (Function "rgb":r':g':b':RightParen:toks)+    | Just r <- w' r', Just g <- w' g', Just b <- w' b' =+        Just (toks, opaque $ sRGB24 r g b)+parseColour _ (Function "rgb":r':g':b':Delim '/':a':RightParen:toks)+    | Just r <- w' r', Just g <- w' g', Just b <- w' b', Just a <- f' a' =+        Just (toks, sRGB24 r g b `withOpacity` a)+parseColour _ (Hash _ v@(r0 :. r1 :. g0 :. g1 :. b0 :. b1 :. ""):toks)+    | Txt.all isHexDigit v = Just (toks, opaque $ sRGBhex r0 r1 g0 g1 b0 b1)+parseColour _ (Hash _ v@(r0 :. r1 :. g0 :. g1 :. b0 :. b1 :. a0 :. a1 :. ""):toks)+    | Txt.all isHexDigit v =+        Just (toks, sRGBhex r0 r1 g0 g1 b0 b1 `withOpacity` h' a0 a1)+parseColour _ (Hash _ v@(r:.g:.b:.""):toks) | Txt.all isHexDigit v =+    Just (toks, opaque $ sRGBhex r r g g b b)+parseColour _ (Hash _ v@(r:.g:.b:.a:.""):toks) | Txt.all isHexDigit v =+    Just (toks, sRGBhex r r g g b b `withOpacity` h' a a)++parseColour _ (Ident x:toks) | Just x' <- inner $ Txt.toLower x =+    Just (toks, opaque x')+  where+    -- NOTE: Some of these colour names are inconsistant or even offensive.+    -- There are historical reasons for this labelling.+    -- https://www.youtube.com/watch?v=HmStJQzclHc+    inner "aliceblue" = Just aliceblue+    inner "antiquewhite" = Just antiquewhite+    inner "aqua" = Just aqua+    inner "aquamarine" = Just aquamarine+    inner "azure" = Just azure+    inner "beige" = Just beige+    inner "bisque" = Just bisque+    inner "black" = Just black+    inner "blanchedalmond" = Just blanchedalmond+    inner "blue" = Just blue+    inner "blueviolet" = Just blueviolet+    inner "brown" = Just brown+    inner "burlywood" = Just burlywood+    inner "cadetblue" = Just cadetblue+    inner "chartreuse" = Just chartreuse+    inner "chocolate" = Just chocolate+    inner "coral" = Just coral+    inner "cornflowerblue" = Just cornflowerblue+    inner "cornsilk" = Just cornsilk+    inner "crimson" = Just crimson+    inner "cyan" = Just cyan+    inner "darkblue" = Just darkblue+    inner "darkcyan" = Just darkcyan+    inner "darkgoldenrod" = Just darkgoldenrod+    inner "darkgray" = Just darkgray+    inner "darkgrey" = Just darkgrey+    inner "darkgreen" = Just darkgreen+    inner "darkkhaki" = Just darkkhaki+    inner "darkmagenta" = Just darkmagenta+    inner "darkolivegreen" = Just darkolivegreen+    inner "darkorange" = Just darkorange+    inner "darkorchid" = Just darkorchid+    inner "darkred" = Just darkred+    inner "darksalmon" = Just darksalmon+    inner "darkseagreen" = Just darkseagreen+    inner "darkslateblue" = Just darkslateblue+    inner "darkslategray" = Just darkslategray+    inner "darkslategrey" = Just darkslategrey+    inner "darkturquoise" = Just darkturquoise+    inner "darkviolet" = Just darkviolet+    inner "deeppink" = Just deeppink+    inner "deepskyblue" = Just deepskyblue+    inner "dimgray" = Just dimgray+    inner "dimgrey" = Just dimgrey+    inner "dodgerblue" = Just dodgerblue+    inner "firebrick" = Just firebrick+    inner "floralwhite" = Just floralwhite+    inner "forestgreen" = Just forestgreen+    inner "fuchsia" = Just fuchsia+    inner "gainsboro" = Just gainsboro+    inner "ghostwhite" = Just ghostwhite+    inner "gold" = Just gold+    inner "goldenrod" = Just goldenrod+    inner "gray" = Just gray+    inner "grey" = Just grey+    inner "green" = Just green+    inner "greenyellow" = Just greenyellow+    inner "honeydew" = Just honeydew+    inner "hotpink" = Just hotpink+    inner "indianred" = Just indianred+    inner "indigo" = Just indigo+    inner "ivory" = Just ivory+    inner "khaki" = Just khaki+    inner "lavender" = Just lavender+    inner "lavenderblush" = Just lavenderblush+    inner "lawngreen" = Just lawngreen+    inner "lemonchiffon" = Just lemonchiffon+    inner "lightblue" = Just lightblue+    inner "lightcoral" = Just lightcoral+    inner "lightcyan" = Just lightcyan+    inner "lightgoldenrodyellow" = Just lightgoldenrodyellow+    inner "lightgray" = Just lightgray+    inner "lightgrey" = Just lightgrey+    inner "lightgreen" = Just lightgreen+    inner "lightpink" = Just lightpink+    inner "lightsalmon" = Just lightsalmon+    inner "lightseagreen" = Just lightseagreen+    inner "lightskyblue" = Just lightskyblue+    inner "lightslategray" = Just lightslategray+    inner "lightslategrey" = Just lightslategrey+    inner "lightsteelblue" = Just lightsteelblue+    inner "lightyellow" = Just lightyellow+    inner "lime" = Just lime+    inner "limegreen" = Just limegreen+    inner "linen" = Just linen+    inner "magenta" = Just magenta+    inner "maroon" = Just maroon+    inner "mediumaquamarine" = Just mediumaquamarine+    inner "mediumblue" = Just mediumblue+    inner "mediumorchid" = Just mediumorchid+    inner "mediumpurple" = Just mediumpurple+    inner "mediumseagreen" = Just mediumseagreen+    inner "mediumslateblue" = Just mediumslateblue+    inner "mediumspringgreen" = Just mediumspringgreen+    inner "mediumturquoise" = Just mediumturquoise+    inner "mediumvioletred" = Just mediumvioletred+    inner "midnightblue" = Just midnightblue+    inner "mintcream" = Just mintcream+    inner "mistyrose" = Just mistyrose+    inner "moccasin" = Just moccasin+    inner "navajowhite" = Just navajowhite+    inner "navy" = Just navy+    inner "oldlace" = Just oldlace+    inner "olive" = Just olive+    inner "olivedrab" = Just olivedrab+    inner "orange" = Just orange+    inner "orangered" = Just orangered+    inner "orchid" = Just orchid+    inner "palegoldenrod" = Just palegoldenrod+    inner "palegreen" = Just palegreen+    inner "paleturquoise" = Just paleturquoise+    inner "palevioletred" = Just palevioletred+    inner "papayawhip" = Just papayawhip+    inner "peachpuff" = Just peachpuff+    inner "peru" = Just peru+    inner "pink" = Just pink+    inner "plum" = Just plum+    inner "powderblue" = Just powderblue+    inner "purple" = Just purple+    -- Named after CSS pioneer Eric Meyer's late daughter+    inner "rebeccapurple" = Just $ sRGB 102 51 153+    inner "red" = Just red+    inner "rosybrown" = Just rosybrown+    inner "royalblue" = Just royalblue+    inner "saddlebrown" = Just saddlebrown+    inner "salmon" = Just salmon+    inner "sandybrown" = Just sandybrown+    inner "seagreen" = Just seagreen+    inner "seashell" = Just seashell+    inner "sienna" = Just sienna+    inner "silver" = Just silver+    inner "skyblue" = Just skyblue+    inner "slateblue" = Just slateblue+    inner "slategray" = Just slategray+    inner "slategrey" = Just slategrey+    inner "snow" = Just snow+    inner "springgreen" = Just springgreen+    inner "steelblue" = Just steelblue+    inner "tan" = Just Data.Colour.Names.tan+    inner "teal" = Just teal+    inner "thistle" = Just thistle+    inner "tomato" = Just tomato+    inner "turquoise" = Just turquoise+    inner "violet" = Just violet+    inner "wheat" = Just wheat+    inner "white" = Just white+    inner "whitesmoke" = Just whitesmoke+    inner "yellow" = Just yellow+    inner "yellowgreen" = Just yellowgreen+    inner _ = Nothing+parseColour _ (Ident x:toks) | Txt.toLower x == "transparent" =+    Just (toks, transparent)+-- FIXME: Add infrastructure to prioritize resolving `color`+parseColour self@ColourPallet { foreground = colour} (Ident x:toks)+    | Txt.toLower x `elem` ["currentcolor", "initial"] = Just (toks, colour)+    | Txt.toLower x == "accentcolor" = Just (toks, accent self)++parseColour _ (Function "hsl":hue':Comma:Percentage _ s:Comma:Percentage _ l:+        RightParen:toks)+    | Just hue <- d hue' = Just (toks, opaque $ hsl' hue (pc s) (pc l))+parseColour _ (Function "hsl":hue':Comma:Percentage _ s:Comma:Percentage _ l:+        Comma:a':RightParen:toks) | Just hue <- d hue', Just a <- f' a' =+    Just (toks, hsl' hue (pc s) (pc l) `withOpacity` a)+parseColour _ (Function "hsla":hue':Comma:Percentage _ s:Comma:Percentage _ l:+        Comma:a':RightParen:toks) | Just hue <- d hue', Just a <- f' a' =+    Just (toks, hsl' hue (pc s) (pc l) `withOpacity` a)+parseColour _ (Function "hsl":hue':s':l':RightParen:toks)+    | Just hue <- d' hue', Just s <- pc' s', Just l <- pc' l' =+        Just (toks, opaque $ hsl' hue s l)+parseColour _ (Function "hsl":hue':s':l':Delim '/':a':RightParen:toks)+    | Just hue <- d' hue', Just s <- pc' s', Just l <- pc' l', Just a <- f' a' =+        Just (toks, hsl' hue s l `withOpacity` a)++parseColour _ _ = Nothing++sRGBhex :: Char -> Char -> Char -> Char -> Char -> Char -> Colour Float+sRGBhex r0 r1 g0 g1 b0 b1 = sRGB24 (h r0 r1) (h g0 g1) (h b0 b1)++h :: Char -> Char -> Word8+h a b+    | Just a' <- toLower a `elemIndex` digits,+        Just b' <- toLower b `elemIndex` digits = toEnum a'*16 + toEnum b'+    | otherwise = trace (a:b:" Invalid hexcode!") 0 -- Should already be checked!+  where+    digits = "0123456789abcdef"+h' :: Char -> Char -> Float+h' a b = fromIntegral (h a b) / 255++pc :: NumericValue -> Float+pc x = f x / 100+pc' :: Token -> Maybe Float+pc' (Ident "none") = Just 0+pc' (Percentage _ x) = Just $ pc x+pc' _ = Nothing++f :: NumericValue -> Float+f (NVInteger x) = fromIntegral x+f (NVNumber x) = toRealFloat x+f' :: Token -> Maybe Float+f' (Ident "none") = Just 0+f' (Percentage _ x) = Just $ pc x+f' (Number _ x) = Just $ f x+f' _ = Nothing++w :: Integer -> Word8+w = fromInteger+w' :: Token -> Maybe Word8+w' (Ident "none") = Just 0+w' (Number _ (NVInteger x)) | x >= 0 && x <= 255 = Just $ fromIntegral $ w x+w' (Percentage _ x) = Just $ toEnum $ fromEnum (pc x * 255)+w' _ = Nothing++d', d :: Token -> Maybe Float+d (Dimension _ x "deg") = Just $ f x+d (Dimension _ x "grad") = Just $ f x / 400 * 360+d (Dimension _ x "rad") = Just $ f x / pi * 180+d (Dimension _ x "turn") = Just $ f x * 360+d (Number _ x) = Just $ f x+d _ = Nothing+d' (Ident "none") = Just 0+d' x = d x++-- Copied from css-syntax.+pattern (:.) :: Char -> Txt.Text -> Txt.Text+pattern x :. xs <- (Txt.uncons -> Just (x, xs))++infixr 5 :.

@@ -0,0 +1,100 @@+{-# LANGUAGE OverloadedStrings #-}+module Graphics.Rendering.Rect.Image(+    Atlas, buildAtlas, Texture(..), atlasLookup, textureSetRepeat) where++import qualified Data.HashMap.Lazy as HM+import Data.Text (Text)+import Codec.Picture (DynamicImage(..), Image(..), PixelF, pixelMap)+import Codec.Picture.Types (promoteImage, dynamicMap, convertImage)++import Control.Monad.IO.Class (MonadIO(..))+import Control.Monad (forM)+import Data.Maybe (fromMaybe)++import Graphics.GL.Core32+import Graphics.GL.Types+import Graphics.GL.Ext.EXT.Cmyka+import Graphics.GL.Ext.SGIX.Ycrcb+import Graphics.GL.Compatibility32++import Data.Vector.Storable (unsafeWith, unsafeCast, Vector)+import Foreign.Ptr (castPtr)+import Foreign.Marshal.Array (allocaArray, peekArray)++data Atlas = Atlas { unAtlas :: HM.HashMap Text Texture }++buildAtlas :: MonadIO m => (Text -> IO DynamicImage) -> [Text] -> m Atlas+buildAtlas _ [] = return $ Atlas HM.empty+buildAtlas cb srcs = do+    -- TODO Merge textures into an actual atlas.+    let len = length srcs+    textures <- liftIO $ allocaArray (toEnum len) $ \ptr -> do+        glGenTextures (toEnum len) ptr+        peekArray len ptr+    imgs <- liftIO $ forM srcs cb++    sizes <- forM (zip textures imgs) $ \(texture, dyn) -> do+        -- NOTE: `unsafe` crashes with a divide-by-zero given a `Vector ()`+        let dyn' = convertDyn dyn+        let img = dynamicMap (unsafeCast . imageData) dyn' :: Vector Word+        let (format, word) = glFormat dyn'+        liftIO $ glBindTexture GL_TEXTURE_2D texture+        liftIO $ unsafeWith img $ glTexImage2D GL_TEXTURE_2D 0 GL_RGBA+                    (toEnum $ dynamicMap imageWidth dyn')+                    (toEnum $ dynamicMap imageHeight dyn')+                    0 format word . castPtr+        liftIO $ glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER GL_LINEAR+        liftIO $ glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER GL_LINEAR++        return (toEnum $ dynamicMap imageWidth dyn',+                toEnum $ dynamicMap imageHeight dyn')++    let textures' = map (uncurry Texture) $ zip textures sizes+    return $ Atlas $ HM.fromList $ zip srcs textures'++data Texture = Texture { unTexture :: GLuint, texSize :: (Float, Float) }+nilTexture :: Texture+nilTexture = Texture 0 (0, 0)+atlasLookup :: Text -> Atlas -> Texture+atlasLookup key = fromMaybe nilTexture . HM.lookup key . unAtlas+textureSetRepeat :: MonadIO m => Texture -> (Bool, Bool) -> m ()+textureSetRepeat tex (repeatX, repeatY) = do+    liftIO $ glBindTexture GL_TEXTURE_2D $ unTexture tex+    liftIO $ glTexParameteri GL_TEXTURE_2D GL_TEXTURE_WRAP_S $+        if repeatX then GL_REPEAT else GL_CLAMP_TO_BORDER+    liftIO $ glTexParameteri GL_TEXTURE_2D GL_TEXTURE_WRAP_T $+        if repeatY then GL_REPEAT else GL_CLAMP_TO_BORDER++-- Convert pixels to some flavour of RGBA+convertDyn :: DynamicImage -> DynamicImage+convertDyn (ImageY8 img) = ImageRGBA8 $ promoteImage img+convertDyn (ImageY16 img) = ImageRGBA16 $ promoteImage img+convertDyn (ImageY32 img) =+    ImageRGBF $ promoteImage (pixelMap fromIntegral img :: Image PixelF)+convertDyn (ImageYF img) = ImageRGBF $ promoteImage img+convertDyn (ImageYA8 img) = ImageRGBA8 $ promoteImage img+convertDyn (ImageYA16 img) = ImageRGBA16 $ promoteImage img+convertDyn (ImageRGB8 img) = ImageRGB8 img+convertDyn (ImageRGB16 img) = ImageRGB16 img+convertDyn (ImageRGBF img) = ImageRGBF img+convertDyn (ImageRGBA8 img) = ImageRGBA8 img+convertDyn (ImageRGBA16 img) = ImageRGBA16 img+convertDyn (ImageYCbCr8 img) = ImageRGB8 $ convertImage img+convertDyn (ImageCMYK8 img) = ImageRGB8 $ convertImage img+convertDyn (ImageCMYK16 img) = ImageRGB16 $ convertImage img++glFormat :: DynamicImage -> (GLenum, GLenum)+glFormat (ImageY8 _) = (GL_LUMINANCE, GL_UNSIGNED_BYTE)+glFormat (ImageY16 _) = (GL_LUMINANCE, GL_UNSIGNED_SHORT)+glFormat (ImageY32 _) = (GL_LUMINANCE, GL_UNSIGNED_INT)+glFormat (ImageYF _) = (GL_LUMINANCE, GL_FLOAT)+glFormat (ImageYA8 _) = (GL_LUMINANCE_ALPHA, GL_BYTE)+glFormat (ImageYA16 _) = (GL_LUMINANCE_ALPHA, GL_UNSIGNED_SHORT)+glFormat (ImageRGB8 _) = (GL_RGB, GL_UNSIGNED_BYTE)+glFormat (ImageRGB16 _) = (GL_RGB, GL_UNSIGNED_SHORT)+glFormat (ImageRGBF _) = (GL_RGB, GL_FLOAT)+glFormat (ImageRGBA8 _) = (GL_RGBA, GL_UNSIGNED_BYTE)+glFormat (ImageRGBA16 _) = (GL_RGBA, GL_UNSIGNED_BYTE)+glFormat (ImageYCbCr8 _) = (GL_YCRCB_444_SGIX, GL_UNSIGNED_BYTE)+glFormat (ImageCMYK8 _) = (GL_CMYK_EXT, GL_UNSIGNED_BYTE)+glFormat (ImageCMYK16 _) = (GL_CMYK_EXT, GL_UNSIGNED_SHORT)

@@ -0,0 +1,142 @@+{-# LANGUAGE RecordWildCards #-}+-- So getters can implement typeclasses+{-# LANGUAGE TypeSynonymInstances, FlexibleInstances #-}+module Graphics.Rendering.Rect.Types(Rect(..), size, Rects(..), BoxSelector,+        Uniform, u, us, c, cs, renderRectWith, liftGL) where++import Linear (M44, V2(..), V4(..))+import qualified Data.ByteString.Char8 as B8+import Data.ByteString (ByteString)+import qualified Data.Vector.Unboxed as UV++import Typograffiti.GL+import Graphics.GL.Core32+import Graphics.GL.Types+import Foreign.Marshal.Array (withArray, withArrayLen)+import Foreign.Ptr (castPtr)++import Control.Monad.IO.Class (MonadIO(..))+import Control.Monad (forM)+import System.Exit (die)++import Data.Colour (AlphaColour, over, alphaChannel)+import Data.Colour.SRGB (RGB(..), toSRGB)+import Data.Colour.Names (black)+import Graphics.Rendering.Rect.Image (Texture(..))++data Rect = Rect {+    left :: Float, top :: Float,+    right :: Float, bottom :: Float+} deriving (Read, Show, Eq, Ord)+rect2geom :: Rect -> UV.Vector (V2 Float)+rect2geom Rect{..} = UV.fromList+    [V2 left top, V2 right top, V2 left bottom, V2 right bottom]+size :: Rect -> (Float, Float)+size Rect {..} = (right - left, bottom - top)++data Rects = Rects {+    contentBox :: Rect,+    paddingBox :: Rect,+    borderBox :: Rect,+    marginBox :: Rect+} deriving (Read, Show, Eq, Ord)+rect :: Float -> Rect+rect x = Rect x x x x++type BoxSelector = Rects -> Rect+instance Eq BoxSelector where+    a == b = a rects == b rects+      where rects = Rects (rect 0) (rect 1) (rect 2) (rect 3)+instance Show BoxSelector where+    show a | a rects == rect 0 = "contentBox"+        | a rects == rect 1 = "paddingBox"+        | a rects == rect 2 = "borderBox"+        | a rects == rect 3 = "marginBox"+        | otherwise = "?"+      where rects = Rects (rect 0) (rect 1) (rect 2) (rect 3)+instance Read BoxSelector where+    readsPrec _ ('c':'o':'n':'t':'e':'n':'t':'B':'o':'x':t) = [(contentBox, t)]+    readsPrec _ ('p':'a':'d':'d':'i':'n':'g':'B':'o':'x':t) = [(paddingBox, t)]+    readsPrec _ ('b':'o':'r':'d':'e':'r':'B':'o':'x':t) = [(borderBox, t)]+    readsPrec _ ('m':'a':'r':'g':'i':'n':'B':'o':'x':t) = [(marginBox, t)]+    readsPrec _ _ = []++vertexShader :: ByteString+vertexShader = B8.pack $ unlines [+    "#version 330 core",+    "uniform mat4 transform;",+    "uniform vec2 origin;",+    "in vec2 pos;",+    "out vec2 coord;",+    "void main() {",+    "   gl_Position = vec4(pos, 0, 1) * transform;",+    "   coord = pos - origin;",+    "}"+  ]++type Uniform m = GLuint -> GLint -> m ()+u :: (MonadIO m, UniformValue a) => a -> Uniform m+u val prog slot = liftIO $ updateUniform prog slot val+us :: MonadIO m => [Float] -> Uniform m+us vals prog slot = do+    liftIO $ withArrayLen vals $ \len -> glUniform1fv slot (toEnum len)+    clearUniformUpdateError prog slot vals++c :: MonadIO m => AlphaColour Float -> Uniform m+c rgba = u $ c' rgba+c' :: AlphaColour Float -> V4 Float+c' rgba = V4 r g b a+  where+    a = alphaChannel rgba+    -- Workaround for missing APIs in "colour" hackage.+    RGB r g b = toSRGB $ over rgba black+cs :: MonadIO m => Int -> [AlphaColour Float] -> Uniform m+cs mlen rgba prog slot = do+    let val = map c' $ take mlen rgba+    liftIO $ withArrayLen val $ \len -> glUniform4fv slot (toEnum len) . castPtr+    clearUniformUpdateError prog slot val++renderRectWith :: (MonadIO m, MonadIO n) => ByteString -> [String] ->+        n ([Texture] -> [Uniform m] -> (a -> Rect) -> (a -> Rect) -> a+            -> M44 Float -> m ())+renderRectWith fragmentShader uniformNames = do+    vs <- liftGL $ compileOGLShader vertexShader GL_VERTEX_SHADER+    fs <- liftGL $ compileOGLShader fragmentShader GL_FRAGMENT_SHADER+    prog <- liftGL $ compileOGLProgram [("pos", 0)] [vs, fs]+    uniformIDs <- forM uniformNames $ getUniformLocation prog+    matID <- getUniformLocation prog "transform"+    originID <- getUniformLocation prog "origin"+    szID <- getUniformLocation prog "boxSize"+    glUseProgram prog+    glEnable GL_BLEND+    glBlendFunc GL_SRC_ALPHA GL_ONE_MINUS_SRC_ALPHA+    return $ \textures uniforms clip' origin' rects mat -> do+        vao <- liftIO $ newBoundVAO+        pbuf <- newBuffer+        bufferGeometry 0 pbuf $ rect2geom $ clip' rects++        glUseProgram prog+        liftIO $ updateUniform prog matID $ mflip mat+        let r = origin' rects+        liftIO $ updateUniform prog originID $ V2 (left r) (top r)+        liftIO $ updateUniform prog szID $ V2 (right r - left r) (bottom r - top r)+        _ <- forM (zip uniformIDs uniforms) $ \(slot, cb) -> cb prog slot++        withBoundTextures (map unTexture textures) $ do+            glBindVertexArray vao+            drawVAO prog vao GL_TRIANGLE_STRIP 4+            glBindVertexArray 0++        liftIO $ withArray [pbuf] $ glDeleteBuffers 1+        liftIO $ withArray [vao] $ glDeleteVertexArrays 1++liftGL :: MonadIO m => IO (Either String a) -> m a+liftGL n = do+    ret <- liftIO n+    case ret of+        Left err -> liftIO $ die err+        Right x -> return x++mflip :: V4 (V4 a) -> V4 (V4 a)+mflip (V4 (V4 a b cc d) (V4 e f g h) (V4 i j k l) (V4 m n o p)) =+    V4 (V4 a e i m) (V4 b f j n) (V4 cc g k o) (V4 d h l p)

@@ -0,0 +1,4 @@+module Main (main) where++main :: IO ()+main = putStrLn "Test suite not yet implemented."