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Within LTS Haskell 24.34 (ghc-9.10.3)

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1. premap :: (a -> b) -> Scan b r -> Scan a r

   foldl	Control.Scanl

   (premap f scaner) returns a new Scan where f is applied at each step

   scan (premap f scaner) list = scan scaner (map f list)
   

   premap id = id
   
   premap (f . g) = premap g . premap f
   

   premap k (pure r) = pure r
   
   premap k (f <*> x) = premap k f <*> premap k x
   

2. 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
   

3. type SessionMap = Map Text ByteString

   yesod-core	Yesod.Core.Handler

   No documentation available.

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

   yesod-core	Yesod.Core.Types

   No documentation available.

5. type SessionMap = Map Text ByteString

   yesod-core	Yesod.Core.Types

   No documentation available.

6. type TypeMap = HashMap TypeRep Dynamic

   yesod-core	Yesod.Core.Types

   No documentation available.

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:

   • ImageY8
   • ImageRGB8
   • ImageRGBA8

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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