potrace (empty) → 0.1.0.0

raw patch · 7 files changed

+1424/−0 lines, 7 filesdep +JuicyPixelsdep +basedep +bindings-potracesetup-changed

Dependencies added: JuicyPixels, base, bindings-potrace, bytestring, containers, data-default, vector

Files

• LICENSE +674/−0
• README.md +30/−0
• Setup.hs +2/−0
• diagrams/alphaMax.svg +186/−0
• potrace.cabal +34/−0
• src/Graphics/Potrace.hs +189/−0
• src/Graphics/Potrace/Base.hs +309/−0

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@@ -0,0 +1,30 @@+## potrace++Mid-level bindings to the [potrace] library tracing a bitmap image to+vector paths. Contains helpers for converting [JuicyPixel] images to+bitmaps.++Uses [bindings-potrace] which is not yet on Hackage.++See [potrace-diagrams] for creating diagrams from bitmap images.++## potrace-bindings installation++### mac++With [homebrew]:++```+brew install potrace+```++`cabal` may complain about not finding the potrace library. In which can+you can add the `--extra-lib-dirs=/usr/local/lib+--extra-include-dirs=/usr/local/include` flags when `cabal install`ing.+++[potrace]: http://potrace.sourceforge.net+[JuicyPixel]: https://github.com/Twinside/Juicy.Pixels+[bindings-potrace]: https://github.com/rwbarton/bindings-potrace+[potrace-diagrams]: https://github.com/diagrams/potrace-diagrams+[homebrew]: http://brew.sh

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

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@@ -0,0 +1,34 @@+name:                potrace+version:             0.1.0.0+synopsis:            Trace bitmap images to paths using potrace+description:+  Trace bitmap images to paths using the potrace library. Helpers for+  generating bitmap images from functions or JuicyPixel images.+  .+  See <https://github.com/diagrams/potrace-diagrams/ potrace-diagrams>+  for an implimentation for the diagrams library.+license:             GPL-2+license-file:        LICENSE+author:              Christopher Chalmers+maintainer:          c.chalmers@me.com+copyright:           Copyright (C) 2015 Christopher Chalmers+category:            Graphics+build-type:          Simple+extra-source-files:  README.md, diagrams/*.svg+extra-doc-files:     diagrams/*.svg+cabal-version:       >=1.10++library+  exposed-modules:+    Graphics.Potrace+    Graphics.Potrace.Base+  build-depends:+    base >=4.6 && <5,+    bindings-potrace >=0.1 && <0.2,+    vector,+    JuicyPixels,+    bytestring,+    containers,+    data-default+  hs-source-dirs:      src+  default-language:    Haskell2010

@@ -0,0 +1,189 @@+{-# LANGUAGE RankNTypes   #-}+{-# LANGUAGE TypeFamilies #-}++-----------------------------------------------------------------------------+-- |+-- Module      :  Graphics.Potrace+-- Copyright   :  (c) 2015 Christopher Chalmers+-- License     :  BSD-style (see LICENSE)+-- Maintainer  :  c.chalmers@me.com+--+-- Trace bitmap images into vector paths using the potrace library. This+-- module also provides helpers for turning any "JuicyPixel"s image to a+-- bitmap.+--+module Graphics.Potrace+  (+    -- * Tracing+    trace+  , trace'+  , traceForest+  , traceForest'++    -- * Path type+  , Curve (..)+  , Segment (..)+  , P2 (..)++    -- * Bitmaps+  , Bitmap+  , generate+  , fromImage+  , toImage+  , lumaThreshold++  -- * Parameters+  , Parameters (..)+  , TurnPolicy (..)++  -- ** Lenses+  , Lens'+  , turdSize+  , turnPolicy+  , alphaMax+  , optTolerance+  )+  where++import Data.Bool+import Codec.Picture.Types++import Graphics.Potrace.Base++------------------------------------------------------------------------+-- Images+------------------------------------------------------------------------++-- | Generate a bitmap by apply the predicate function to each pixel of+--   "JuicyPixels" image. 'True' corresponds to a black pixel, 'False'+--   corresponds to white.+fromImage :: Pixel a => Image a -> (a -> Bool) -> Bitmap+fromImage img@(Image w h _) f =+  generate w h $ \i j -> f $ pixelAt img i (h - j - 1)+  -- potrace starts at bottom left, juicy starts at top left++-- | Convert a 'Bitmap' to an 'image' by using the given pixels for+--   'True' and 'False'. This is mainly here for debugging purposes.+toImage :: Pixel a => Bitmap -> a -> a -> Image a+toImage bm@(Bitmap w h _ _) on off = generateImage f w h+  where f i j = bool off on $ index bm i (h - j - 1)++-- | Generate a bitmap choosing pixels according to their luma plane for+--   a threshold given between 0 and 1. Anything below the threshold is+--   white. Anything above the threshold is black. Throws an error for+--   CMYK images.+lumaThreshold :: DynamicImage -> Double -> Bitmap+lumaThreshold dimg t = case dimg of+  ImageY8 i     -> word8 i+  ImageY16 i    -> word16 i+  ImageYF i     -> float i+  ImageYA8 i    -> word8 i+  ImageYA16 i   -> word16 (dropAlphaLayer i)+  ImageRGB8 i   -> word8 i+  ImageRGB16 i  -> word16 i+  ImageRGBF i   -> float i+  ImageRGBA8 i  -> word8 i+  ImageRGBA16 i -> word16 (dropAlphaLayer i)+  ImageYCbCr8 i -> word8 i+  _             -> error "unable to compute lumaTheshold for CMYK images"+  -- ImageCMYK8 i  -> word8 (promoteImage i :: Image PixelRGB8)+  -- ImageCMYK16 i -> word16 (promoteImage i :: Image PixelRGB16)+  where+  word8 :: (PixelBaseComponent a ~ Pixel8, LumaPlaneExtractable a)+        => Image a -> Bitmap+  word8 img = fromImage img ((<x) . computeLuma)+    where x = round $ t * 255++  word16 :: (PixelBaseComponent a ~ Pixel16, LumaPlaneExtractable a)+        => Image a -> Bitmap+  word16 img = fromImage img ((<x) . computeLuma)+    where x = round $ t * 65535++  float :: (PixelBaseComponent a ~ PixelF, LumaPlaneExtractable a)+        => Image a -> Bitmap+  float img = fromImage img ((<x) . computeLuma)+    where x = realToFrac t++-- Lenses --------------------------------------------------------------++-- | A van Laarhoven lens, compatible with various lens libraries.+type Lens' s a = forall f. Functor f => (a -> f a) -> s -> f s++(<&>) :: Functor f => f a -> (a -> b) -> f b+(<&>) = flip fmap++-- | The 'turdSize' parameter can be used to “despeckle” the bitmap to+--   be traced, by removing all curves whose enclosed area is below the+--   given threshold.+--+--   Default is @2@.+turdSize :: Lens' Parameters Int+turdSize f ps = f (_turdSize ps) <&> \p' -> ps { _turdSize = p' }++-- | The 'TurnPolicy' parameter determines how to resolve ambiguities+--   during decomposition of bitmaps into paths.+--+--   Default is 'MinorityTP'.+turnPolicy :: Lens' Parameters TurnPolicy+turnPolicy f ps = f (_turnPolicy ps) <&> \p' -> ps { _turnPolicy = p' }++-- | The `alphamax` parameter is a threshold for the detection of+--   corners.  It controls the smoothness of the traced curve.The useful+--   range of this parameter is from 0.0 (polygon) to 1.3334 (no+--   corners).+--+--   Default is @1.0@.+--+-- <<diagrams/alphaMax.svg#diagram=alphaMaxExample&width=500>>+alphaMax :: Lens' Parameters Double+alphaMax f ps = f (_alphaMax ps) <&> \p' -> ps { _alphaMax = p' }++-- | The `optTolerance` parameter defines the amount of error allowed in+--   this simplification. Larger values tend to decrease the number of+--   segments, at the expense of less accuracy. The useful range is from+--   0 to infinity, although in practice one would hardly choose values+--   greater than 1 or so. For most purposes, the default value is a+--   good trade off between space and accuracy. 'Nothing' turns+--   simplification off.+--+--   Default is @'Just' 1.0@.+optTolerance :: Lens' Parameters (Maybe Double)+optTolerance f ps = f (_optTolerance ps) <&> \p' -> ps { _optTolerance = p' }++------------------------------------------------------------------------+-- SVG+------------------------------------------------------------------------++-- | Very basic svg conversion. If you want more control over the output+--   consider "diagrams-potrace".++-- path :: [P.Loop] -> [Builder] -> Builder+-- path ls attr = "<path " <> attrs <> d_ (loops ls)++-- d_ :: Builder -> Builder+-- d_ attrs = "d=\"" <> d <> "\""++-- -- | Multiple loops together in order, suitable to put inside a \"d\" attribute.+-- loops :: [P.Loop] -> Builder+-- loops = foldMap loop++-- -- | A single loop in an svg suitable to put inside a \"d\" attribute.+-- loop :: P.Loop -> Builder+-- loop (Loop p0 segs) = "M" <> pt p0 <> foldMap seg path <> " Z"+--   where+--     seg (Cubic p1 p2 p3) = "C" <> pt p1 <> " " <> pt p2 <> " " <> pt p3+--     seg (Corner p1 p2)   = "L" <> pt p1 <> "L" <> pt p2++-- mv :: Point -> Builder+-- mv p = "M " <> pt p+-- {-# INLINE mv #-}++-- pt :: Point -> Builder+-- pt (P2 x y) = n x <> " " <> n (-y)+-- {-# INLINE pt #-}++-- -- Not the fastest way but it'll do. 4 d.p. should be enough.+-- n :: Double -> Builder+-- n = string7 . showFFloat (Just 4)+-- {-# INLINE n #-}+

@@ -0,0 +1,309 @@+{-# LANGUAGE BangPatterns #-}+{-# LANGUAGE LambdaCase   #-}++-----------------------------------------------------------------------------+-- |+-- Module      :  Graphics.Potrace.Base+-- Copyright   :  (c) 2015 Christopher Chalmers+-- License     :  BSD-style (see LICENSE)+-- Maintainer  :  c.chalmers@me.com+--+-- A mid-level interface to potrace. Includes helpers for making+-- bitmap images. This is useful for other libraries that want to+-- implement their own tools on top of potrace (see+-- "potrace-diagrams").+--+-- In principle this could be in a separate module but there's already+-- three separate potrace modules and the dependencies aren't huge.+++module Graphics.Potrace.Base+  (+    -- * Tracing+    Curve (..)+  , Segment (..)+  , P2 (..)+  , trace+  , trace'+  , traceForest+  , traceForest'++    -- * Bitmaps+  , Bitmap (..)+  , generate+  , index++  -- * Parameters+  , Parameters (..)+  , TurnPolicy (..)+  ) where++import           Control.Applicative+import           Data.Bits+import           Data.Default+import           Data.Monoid+import           Data.Tree+import qualified Data.Vector.Storable as V+import           Foreign.C.Types+import           Foreign.Marshal.Alloc+import           Foreign.Ptr+import           Foreign.Storable+import           System.IO.Unsafe (unsafePerformIO)++import           Bindings.Potrace++------------------------------------------------------------------------+-- Bitmap+------------------------------------------------------------------------++-- | Data type to represent a bit packed image. This can be passed to+--   potrace via 'trace'. The constructor is exported by+--   'Graphics.Potrace.Base' but be aware the underlying vector has a+--   host dependant form. You are advised to use 'generate' to create a+--   'Bitmap'.+data Bitmap = Bitmap+  { bitmapWidth  :: Int+  , bitmapHeight :: Int+  , bitmapDy     :: Int+  , bitmapData   :: V.Vector CULong+  }++-- | Given an image and a predicate for whether a pixel is on or off,+--   create a bit-packed image suitable for passing to potrace.+generate :: Int -> Int -> (Int -> Int -> Bool) -> Bitmap+generate w h f = Bitmap w h dy v+  where+  -- The format of the vector potrace needs depends on the size and+  -- endianness of the machine.+  m = sizeOf (0 :: CULong) * 8++  -- Potrace works in blocks of the Word size m. We make each x+  -- (horizontal) line n words wide, the last word only uses r of its+  -- bits.+  (n,r) = w `divMod` m+  dy = if r == 0 then n else n + 1++  -- Number of potential pixels (bits) in each x line (we only use w of them).+  l = dy * m++  -- Each x line is made up of dy words, so we need dy*h words for+  -- the whole picture.+  v = V.generate (dy*h) $ \i ->+    -- The starting point in the image for current block of pixels.+    let (y,x) = (i*m) `divMod` l+        -- Number of pixels we need to fill.+        c | x + m  > w = r+          | otherwise  = m++        -- Loop to fill word with bits. XXX Deal with endianness+        go !k !b+          | k < 0       = b+          | f (x + k) y = go (k - 1) $ setBit b (m - 1 - k)+          | otherwise   = go (k - 1) b++    in  go (c - 1) 0+{-# INLINE generate #-}++-- | Index a pixel in a 'Bitmap'. This is mainly here for debugging+--   purposes.+index :: Bitmap -> Int -> Int -> Bool+index (Bitmap w h dy v) i j = testBit w (m - 1 - r)+  where+    m = sizeOf (0 :: CULong) * 8+    w = v V.! (j * dy + (i `div` m))+    (n,r) = i `divMod` m+{-# INLINE index #-}++------------------------------------------------------------------------+-- Parameters+------------------------------------------------------------------------++-- | Parameters to control the tracing operation of potrace. The default+--   parameters are+--+-- @+-- Parameters+--   { 'turdSize'     = 2+--   , 'turnPolicy'   = 'MinorityTP'+--   , 'alphaMax'     = 1.0+--   , 'optTolerance' = 'Just' 0.2+--   }+-- @+data Parameters = Parameters+  { _turdSize     :: Int            -- ^ See 'Graphics.Potrace.turdSize'.+  , _turnPolicy   :: TurnPolicy     -- ^ See 'Graphics.Potrace.turnPolicy'.+  , _alphaMax     :: Double         -- ^ See 'Graphics.Potrace.alphaMax'.+  , _optTolerance :: (Maybe Double) -- ^ See 'Graphics.Potrace.optTolerance'.+  }++instance Default Parameters where+  def = Parameters+    { _turdSize     = 2+    , _turnPolicy   = MinorityTP+    , _alphaMax     = 1.0+    , _optTolerance = Just 0.2+    }++-- | How to resolve ambiguities during decomposition of bitmaps into+--   paths.+data TurnPolicy+  = BlackTP    -- ^ Prefers to connect black (foreground) components+  | WhiteTP    -- ^ Prefers to connect white (background) components.+  | LeftTP     -- ^ Always take a left turn.+  | RightTP    -- ^ Always take a right turn.+  | MinorityTP -- ^ Prefers to connect the color (black or white) that+               --   occurs least frequently in a local neighborhood of the+               --   current position.+  | MajorityTP -- ^ Prefers to connect the color (black or white) that+               --   occurs most frequently in a local neighborhood of+               --   the current position. (default)+  | RandomTP   -- ^ Choose pseudo-randomly++-- Parameter internals -------------------------------------------------++-- | Allocate new parameters from potrace's default parameters. This+--   should protect against future changes to the options. When no+--   longer needed, these should be deallocated with+--   'p'potrace_param_free'+params :: Parameters -> IO (Ptr C'potrace_param_s)+params (Parameters ts tp am ot) = do+  c_param <- c'potrace_param_default+  poke (p'potrace_param_s'turdsize     c_param) $ fromIntegral ts+  poke (p'potrace_param_s'turnpolicy   c_param) $ turn tp+  poke (p'potrace_param_s'alphamax     c_param) $ CDouble am+  poke (p'potrace_param_s'opticurve    c_param) $ optiOn+  poke (p'potrace_param_s'opttolerance c_param) $ optiVal+  return c_param+  where (optiOn, optiVal) = case ot of+          Just t  -> (1, CDouble t)+          Nothing -> (0, 0)++turn :: TurnPolicy -> CInt+turn = \case+  BlackTP    -> c'POTRACE_TURNPOLICY_BLACK+  WhiteTP    -> c'POTRACE_TURNPOLICY_WHITE+  LeftTP     -> c'POTRACE_TURNPOLICY_LEFT+  RightTP    -> c'POTRACE_TURNPOLICY_RIGHT+  MinorityTP -> c'POTRACE_TURNPOLICY_MINORITY+  MajorityTP -> c'POTRACE_TURNPOLICY_MAJORITY+  RandomTP   -> c'POTRACE_TURNPOLICY_RANDOM++------------------------------------------------------------------------+-- Tracing+------------------------------------------------------------------------++-- | Data type representing a 2D point were the origin is at the bottom+--   left.+data P2 = P2 {-# UNPACK #-} !Double {-# UNPACK #-} !Double+  deriving (Show, Read)++-- | potrace defines a segment as either 'Bezier' or a 'Corner' (in most+--   systems this is equivalent to linear segments).+data Segment+  = Bezier {-# UNPACK #-} !P2 {-# UNPACK #-} !P2 {-# UNPACK #-} !P2+  | Corner {-# UNPACK #-} !P2 {-# UNPACK #-} !P2+  deriving (Show, Read)++-- | A curve is a list of segments. The starting point is provided for+--   convenience but this is just the final point of the last segment.+data Curve = Curve {-# UNPACK #-} !P2 [Segment]++-- | Trace the bitmap image to a list of curves using potrace with 'def'+--   parameters.+trace :: Bitmap -> [Curve]+trace = trace' def++-- | Trace the bitmap image to a list of curves using potrace with given+--   parameters.+trace' :: Parameters -> Bitmap -> [Curve]+trace' p bm = unsafePerformIO $ unsafeWithImage pathList p bm++-- | Trace the bitmap image as a forest of curves using potrace with 'def'+--   parameters. Each child curve is completely contained in it's+--   parent.+traceForest :: Bitmap -> Forest Curve+traceForest = traceForest' def++-- | Trace the bitmap image as a forest of curves using potrace with+--   given parameters parameters. Each child curve is completely+--   contained in it's parent.+traceForest' :: Parameters -> Bitmap -> Forest Curve+traceForest' p bm = unsafePerformIO $ unsafeWithImage pathForest p bm++-- Internals -----------------------------------------------------------++-- | Go though the curve and turn in into a list of segments.+curve :: C'potrace_curve_s -> IO Curve+curve (C'potrace_curve_s n ts ps_) = Curve <$> p0 <*> go 0 where+  ps = castPtr ps_+  -- The last point in the vector is also the starting point+  p0 = peekElemOff ps (3*fromIntegral n - 1)+  go i | i >= fromIntegral n = pure []+  go i = do+    let o = 3*i+    t <- peekElemOff ts i+    s <- if t == c'POTRACE_CORNER+         then Corner <$> peekElemOff ps (o + 1)+                     <*> peekElemOff ps (o + 2)+         else Bezier <$> peekElemOff ps (o + 0)+                     <*> peekElemOff ps (o + 1)+                     <*> peekElemOff ps (o + 2)+    ss <- go (i+1)+    return (s:ss)++-- | Helper for constructing lists from linked lists of pointers. If the+--   ptr is 'nullPtr' return mempty, otherwise pass the pointer value to+--   the function.+onPtr :: (Storable a, Monoid b) => (a -> IO b) -> Ptr a -> IO b+onPtr f ptr+  | ptr == nullPtr = pure mempty+  | otherwise      = peek ptr >>= f+{-# INLINE onPtr #-}++type State = C'potrace_state_s++-- | List of curves in order, suitable for passing to a renderer.+pathList :: State -> IO [Curve]+pathList (C'potrace_state_s _i ptr0 _) = go ptr0 where+  go = onPtr $ \p -> do+    s  <- curve $ c'potrace_path_s'curve p+    ss <- go (c'potrace_path_s'next p)+    pure (s:ss)++-- | Tree structure of paths where each child is enclosed within it's+--   parent.+pathForest :: State -> IO (Forest Curve)+pathForest (C'potrace_state_s _i ptr0 _) = go ptr0 where+  go = onPtr $ \p -> do+    s  <- curve $ c'potrace_path_s'curve p+    ch <- go $ c'potrace_path_s'childlist p+    sb <- go $ c'potrace_path_s'sibling p+    pure (Node s ch : sb)++unsafeWithImage :: (State -> IO r) -> Parameters -> Bitmap -> IO r+unsafeWithImage f ps (Bitmap w h dy v) = V.unsafeWith v $ \p -> do+  c_param <- params ps+  alloca $ \c_bitmap -> do+    poke c_bitmap $ C'potrace_bitmap_s (fromIntegral w) (fromIntegral h) (fromIntegral dy) p+    c_status <- c'potrace_trace c_param c_bitmap+    r        <- peek c_status >>= f++    c'potrace_state_free c_status+    c'potrace_param_free c_param+    return r+------------------------------------------------------------------------+-- Instances+------------------------------------------------------------------------++instance Storable P2 where+  sizeOf _ = 2 * sizeOf (undefined::Double)+  {-# INLINE sizeOf #-}+  alignment _ = alignment (undefined::Double)+  {-# INLINE alignment #-}+  poke ptr (P2 x y) = poke ptr' x >> pokeElemOff ptr' 1 y+    where ptr' = castPtr ptr+  {-# INLINE poke #-}+  peek ptr = P2 <$> peek ptr' <*> peekElemOff ptr' 1+    where ptr' = castPtr ptr+  {-# INLINE peek #-}+