Data.Colour.Word8
Description
This module provides Colour8, which stores RGB (red, green, blue)
colour values where each channel is a Word8. It also provides
arithmetic over such colours, and a few predefined colours.
It is the general intention that "most" work will be done with
Data.Colour.Double, with values converted to Colour8 only
as a final step. However, full arithmetic is supported anyway,
in case anybody wants to work that way. It is slightly less
efficient and flexible, however.
- data Colour8 = Colour8 {}
- c8map :: (Word8 -> Word8) -> Colour8 -> Colour8
- c8zip :: (Word8 -> Word8 -> Word8) -> Colour8 -> Colour8 -> Colour8
- c8fold :: (Word8 -> Word8 -> Word8) -> Colour8 -> Word8
- grey8 :: Word8 -> Colour8
- c8scale :: Word8 -> Colour8 -> Colour8
- unpack8 :: Colour8 -> (Word8, Word8, Word8)
- pack8 :: (Word8, Word8, Word8) -> Colour8
- c8Black :: Colour8
- c8Red :: Colour8
- c8Yellow :: Colour8
- c8Green :: Colour8
- c8Cyan :: Colour8
- c8Blue :: Colour8
- c8Magenta :: Colour8
- c8White :: Colour8
Documentation
The Colour type. Stores a red, a green and a blue component as
strict, unboxed Word8 values. (So it should be quite efficient
in time and space.) Also provides various class instances for
arithmetic, etc.
Note that 0x00 is assumed to mean zero, and 0xFF to mean one.
That means that (*) is slightly slower than you might expect
due to the extra steps required for renormalisation; (+) and
(-) are still efficient, however.
c8map :: (Word8 -> Word8) -> Colour8 -> Colour8Source
Apply a function to every channel of a Colour8. (Mostly used
internally; exposed here in case it might be useful.)
c8zip :: (Word8 -> Word8 -> Word8) -> Colour8 -> Colour8 -> Colour8Source
The colour equivilent of Data.List.zipWith. (Mostly used
internally; exposed here in case it might be useful.)
c8fold :: (Word8 -> Word8 -> Word8) -> Colour8 -> Word8Source
Use a function to fold the three values in a Colour8 into
a single value. No particular order of application is promised.