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Within LTS Haskell 24.66 (ghc-9.10.3)

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  1. premapM :: Monad m => (a -> m b) -> ScanM m b r -> ScanM m a r

    foldl Control.Scanl

    (premapM f scaner) returns a new ScanM where f is applied to each input element 

    premapM return = id

premapM (f <=< g) = premap g . premap f

    premapM k (pure r) = pure r

premapM k (f <*> x) = premapM k f <*> premapM k x

  2. type SessionMap = Map Text ByteString

    yesod-core Yesod.Core.Handler

    No documentation available.

  3. type KeyedTypeMap = HashMap (TypeRep, ByteString) Dynamic

    yesod-core Yesod.Core.Types

    No documentation available.

  4. type SessionMap = Map Text ByteString

    yesod-core Yesod.Core.Types

    No documentation available.

  5. type TypeMap = HashMap TypeRep Dynamic

    yesod-core Yesod.Core.Types

    No documentation available.

  6. foldl1Map :: forall (f :: Type -> Type) b a . Foldable f => (b -> b -> b) -> (a -> b) -> T f a -> b

    non-empty Data.NonEmpty

    It holds: 

    foldl1Map f g = foldl1 f . fmap g
    but foldl1Map does not need a Functor instance.

  7. colorMap :: Pixel a => (PixelBaseComponent a -> PixelBaseComponent a) -> a -> a

    JuicyPixels Codec.Picture

    Apply a function to each component of a pixel. If the color type possess an alpha (transparency channel), it is treated like the other color components.

  8. decodeBitmap :: ByteString -> Either String DynamicImage

    JuicyPixels Codec.Picture

    Try to decode a bitmap image. Right now this function can output the following image:

  9. dynamicMap :: (forall pixel . Pixel pixel => Image pixel -> a) -> DynamicImage -> a

    JuicyPixels Codec.Picture

    Helper function to help extract information from dynamic image. To get the width of a dynamic image, you can use the following snippet: 

    dynWidth :: DynamicImage -> Int
dynWidth img = dynamicMap imageWidth img

  10. dynamicPixelMap :: (forall pixel . Pixel pixel => Image pixel -> Image pixel) -> DynamicImage -> DynamicImage

    JuicyPixels Codec.Picture

    Equivalent of the pixelMap function for the dynamic images. You can perform pixel colorspace independant operations with this function. For instance, if you want to extract a square crop of any image, without caring about colorspace, you can use the following snippet. 

    dynSquare :: DynamicImage -> DynamicImage
dynSquare = dynamicPixelMap squareImage

squareImage :: Pixel a => Image a -> Image a
squareImage img = generateImage (\x y -> pixelAt img x y) edge edge
where edge = min (imageWidth img) (imageHeight img)

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