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Within LTS Haskell 24.58 (ghc-9.10.3)

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  1. mutablePixelBaseIndex :: Pixel a => MutableImage s a -> Int -> Int -> Int

    JuicyPixels Codec.Picture.Types

    Calculate theindex for the begining of the pixel at position x y

  2. packPixel :: PackeablePixel a => a -> PackedRepresentation a

    JuicyPixels Codec.Picture.Types

    The packing function, allowing to transform to a primitive.

  3. pixelAt :: Pixel a => Image a -> Int -> Int -> a

    JuicyPixels Codec.Picture.Types

    Extract a pixel at a given position, (x, y), the origin is assumed to be at the corner top left, positive y to the bottom of the image

  4. pixelBaseIndex :: Pixel a => Image a -> Int -> Int -> Int

    JuicyPixels Codec.Picture.Types

    Calculate the index for the begining of the pixel

  5. pixelFold :: forall acc pixel . Pixel pixel => (acc -> Int -> Int -> pixel -> acc) -> acc -> Image pixel -> acc

    JuicyPixels Codec.Picture.Types

    Fold over the pixel of an image with a raster scan order: from top to bottom, left to right

  6. pixelFoldM :: (Pixel pixel, Monad m) => (acc -> Int -> Int -> pixel -> m acc) -> acc -> Image pixel -> m acc

    JuicyPixels Codec.Picture.Types

    Fold over the pixel of an image with a raster scan order: from top to bottom, left to right, carrying out a state

  7. pixelFoldMap :: forall m px . (Pixel px, Monoid m) => (px -> m) -> Image px -> m

    JuicyPixels Codec.Picture.Types

    Fold over the pixel of an image with a raster scan order: from top to bottom, left to right. This functions is analog to the foldMap from the Foldable typeclass, but due to the Pixel constraint, Image cannot be made an instance of it.

  8. pixelMap :: (Pixel a, Pixel b) => (a -> b) -> Image a -> Image b

    JuicyPixels Codec.Picture.Types

    map equivalent for an image, working at the pixel level. Little example : a brightness function for an rgb image 

    brightnessRGB8 :: Int -> Image PixelRGB8 -> Image PixelRGB8
brightnessRGB8 add = pixelMap brightFunction
where up v = fromIntegral (fromIntegral v + add)
brightFunction (PixelRGB8 r g b) =
PixelRGB8 (up r) (up g) (up b)

  9. pixelMapXY :: (Pixel a, Pixel b) => (Int -> Int -> a -> b) -> Image a -> Image b

    JuicyPixels Codec.Picture.Types

    Just like pixelMap only the function takes the pixel coordinates as additional parameters.

  10. pixelOpacity :: Pixel a => a -> PixelBaseComponent a

    JuicyPixels Codec.Picture.Types

    Return the opacity of a pixel, if the pixel has an alpha layer, return the alpha value. If the pixel doesn't have an alpha value, return a value representing the opaqueness.

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