ModuleJuicyPixels-3.3.9Haskell2010

Codec.Picture.Jpg.Internal.FastDct

2 values

PackageJuicyPixels-3.3.9
Exports2
LanguageHaskell2010
LicenceBSD-3-Clause
SourceFastDct.hs

valuereferenceDct

:: MutableMacroBlock s Int32
-> MutableMacroBlock s Int16
-> ST s (MutableMacroBlock s Int32)

Reference implementation of the DCT, directly implementing the formula of ITU-81. It's slow as hell, perform to many operations, but is accurate and a good reference point.

valuefastDctLibJpeg

:: MutableMacroBlock s Int32
-> MutableMacroBlock s Int16
-> ST s (MutableMacroBlock s Int32)

Fast DCT extracted from libjpeg