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If the Library as you +received it does not specify a version number of the GNU Lesser +General Public License, you may choose any version of the GNU Lesser +General Public License ever published by the Free Software Foundation. + + If the Library as you received it specifies that a proxy can decide +whether future versions of the GNU Lesser General Public License shall +apply, that proxy's public statement of acceptance of any version is +permanent authorization for you to choose that version for the +Library. diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/babl.cabal b/babl.cabal new file mode 100644 --- /dev/null +++ b/babl.cabal @@ -0,0 +1,31 @@ +name: babl +version: 0.0.0.1 +synopsis: Initial project template from stack +description: Please see README.md +homepage: http://github.com/nek0/babl#readme +license: LGPL-3 +license-file: LICENSE +author: nek0 +maintainer: nek0@nek0.eu +-- copyright: +category: Graphics +build-type: Simple +-- extra-source-files: +cabal-version: >=1.10 + +library + exposed-modules: BABL + , BABL.Format + , BABL.FFI + , BABL.FFI.Format + hs-source-dirs: src + default-language: Haskell2010 + other-extensions: ForeignFunctionInterface + extra-libraries: babl-0.1 + includes: babl/babl.h + pkgconfig-depends: babl >= 0.1.16 + build-depends: base >= 4.7 && < 5 + +source-repository head + type: git + location: https://github.com/nek0/babl diff --git a/src/BABL.hs b/src/BABL.hs new file mode 100644 --- /dev/null +++ b/src/BABL.hs @@ -0,0 +1,17 @@ +module BABL + ( babl_init + , babl_exit + , module BABL.Format + ) where + +import BABL.Format + +import qualified BABL.FFI as FFI + +-- | Initialize the BABL environment. +-- This function must be called before performing any conversions +babl_init :: IO () +babl_init = FFI.c_babl_init + +-- | Exit and clean up after BABL has been used +babl_exit = FFI.c_babl_exit diff --git a/src/BABL/FFI.hs b/src/BABL/FFI.hs new file mode 100644 --- /dev/null +++ b/src/BABL/FFI.hs @@ -0,0 +1,15 @@ +-- | FFI module for basic functions +module BABL.FFI + ( c_babl_init + , c_babl_exit + ) where + +import Foreign + +-- | Interface to the @babl_init@ function in C +foreign import ccall unsafe "babl.h babl_init" + c_babl_init :: IO () + +-- | Interface to the @babl_exit@ function in C +foreign import ccall unsafe "babl.h babl_exit" + c_babl_exit :: IO () diff --git a/src/BABL/FFI/Format.hs b/src/BABL/FFI/Format.hs new file mode 100644 --- /dev/null +++ b/src/BABL/FFI/Format.hs @@ -0,0 +1,129 @@ +-- FFI module for handling pixel formats +module BABL.FFI.Format + ( BablFormatPtr(..) + , BablFormatDummy + , ComponentModel(..) + , ComponentFormat(..) + , PixelFormat(..) + , c_babl_format + , c_babl_get_bpp + , c_babl_format_get_n_components + ) where + +import Foreign +import Foreign.C.Types (CInt(..)) +import Foreign.C.String +import Foreign.Ptr (Ptr) + +-- | The dummy Pointer behind 'BablFormatPtr'. Do not 'peek' or 'poke' +type BablFormatDummy = Ptr () +data BablFormatPtr = BablFormatPtr + { unwrap :: BablFormatDummy } + +-- | List of component models af babl formats. +data ComponentModel + = RGB + | RGBA + | RaGaBaA + | R'G'B' + | R'G'B'A + | R'aG'aB'aA + | Y + | YA + | YaA + | Y' + | Y'A + | Y'aA + | Y'CbCr + | Y'CbCrA + | HSVA + | HSV + | CMYK + | CMY + | CIELab + | CIELabAlpha + | CIELCHab + | CIELCHabAlpha + | HSLA + | HSL + | Y'CbCr709 + | Y'CbCrA709 + | Cairo + +instance Show ComponentModel where + show RGB = "RGB" + show RGBA = "RGBA" + show RaGaBaA = "RaGaBaA" + show R'G'B' = "R'G'B'" + show R'G'B'A = "R'G'B'A" + show R'aG'aB'aA = "R'aG'aB'aA" + show Y = "Y" + show YA = "YA" + show YaA = "YaA" + show Y' = "Y'" + show Y'A = "Y'A" + show Y'aA = "Y'aA" + show Y'CbCr = "Y'CbCr" + show Y'CbCrA = "Y'CbCrA" + show HSVA = "HSVA" + show HSV = "HSV" + show CMYK = "CMYK" + show CMY = "CMY" + show CIELab = "CIE Lab" + show CIELabAlpha = "CIE Lab alpha" + show CIELCHab = "CIE LCH(ab)" + show CIELCHabAlpha = "CIE LCH(ab) alpha" + show HSLA = "HSLA" + show HSL = "HSL" + show Y'CbCr709 = "Y'CbCr709" + show Y'CbCrA709 = "Y'CbCrA709" + show Cairo = error "no show for Cairo model" + +-- | Byte format of a colour component. +data ComponentFormat + = CFhalf + | CFfloat + | CFdouble + | CFu8 + | CFu15 + | CFu16 + | CFu32 + | A8 + | RGB24 + | ARGB32 + +instance Show ComponentFormat where + show CFhalf = "half" + show CFfloat = "float" + show CFdouble = "double" + show CFu8 = "u8" + show CFu15 = "u15" + show CFu16 = "u16" + show CFu32 = "u32" + show _ = error "no show here" + +data PixelFormat + = PixelFormat + { pfComponents :: ComponentModel + , pfType :: ComponentFormat + } + +-- | create a new predefined BABL format +foreign import ccall unsafe "babl.h babl_format" + c_babl_format + :: CString -- ^ Format name + -> IO BablFormatDummy + +-- | create and define your own BABL format +-- foreign import ccall unsafe "babl.h babl_format_new" + +-- | Get the number of bytes per pixel from a format. +foreign import ccall unsafe "babl.h babl_format_get_bytes_per_pixel" + c_babl_get_bpp + :: BablFormatDummy -- ^ Format to be drawn from + -> IO CInt + +foreign import ccall unsafe "babl.h babl_format_get_n_components" + c_babl_format_get_n_components + :: BablFormatDummy + -> IO CInt diff --git a/src/BABL/Format.hs b/src/BABL/Format.hs new file mode 100644 --- /dev/null +++ b/src/BABL/Format.hs @@ -0,0 +1,82 @@ +{-# LANGUAGE RecordWildCards #-} + +-- | This module contains the pixel formats supprted my babl +module BABL.Format + ( FFI.PixelFormat(..) + , FFI.ComponentModel(..) + , FFI.ComponentFormat(..) + , FFI.BablFormatPtr + , babl_format + , babl_get_bpp + , babl_format_by_str + , babl_components_per_pixel + ) where + +import qualified BABL.FFI.Format as FFI + +import Foreign.C.String (withCString) +import Foreign.C.Types (CInt(..)) + +babl_components_per_pixel :: FFI.PixelFormat -> Int +babl_components_per_pixel FFI.PixelFormat{..} = + case pfComponents of + FFI.RGB -> 3 + FFI.RGBA -> 4 + FFI.RaGaBaA -> 4 + FFI.R'G'B' -> 3 + FFI.R'G'B'A -> 4 + FFI.R'aG'aB'aA -> 4 + FFI.Y -> 1 + FFI.YA -> 2 + FFI.YaA -> 2 + FFI.Y' -> 1 + FFI.Y'A -> 2 + FFI.Y'aA -> 2 + FFI.Y'CbCr -> 3 + FFI.Y'CbCrA -> 4 + FFI.HSVA -> 4 + FFI.HSV -> 3 + FFI.CMYK -> 4 + FFI.CMY -> 3 + FFI.CIELab -> 3 + FFI.CIELabAlpha -> 4 + FFI.CIELCHab -> 3 + FFI.CIELCHabAlpha -> 4 + FFI.HSLA -> 4 + FFI.HSL -> 3 + FFI.Y'CbCr709 -> 3 + FFI.Y'CbCrA709 -> 4 + FFI.Cairo -> case pfType of + FFI.A8 -> 1 + FFI.RGB24 -> 4 + FFI.ARGB32 -> 4 + _ -> error "wrong type" + +-- | Create a 'BablFormatPtr' to pass around to other functions. +babl_format + :: FFI.PixelFormat -- ^ Format to be used + -> IO FFI.BablFormatPtr -- ^ Pointer to specified format +babl_format (FFI.PixelFormat FFI.Cairo pfType) = + case pfType of + FFI.A8 -> babl_format_by_str "cairo-A8" + FFI.RGB24 -> babl_format_by_str "cairo-RGB24" + FFI.ARGB32 -> babl_format_by_str "cairo-ARGB32" + _ -> error "not a cairo format" +babl_format FFI.PixelFormat{..} = + babl_format_by_str (show pfComponents ++ " " ++ show pfType) + +-- | Build 'BablFormatPtr' by input String +babl_format_by_str + :: String -- ^ Input string + -> IO FFI.BablFormatPtr +babl_format_by_str s = + return . FFI.BablFormatPtr =<< withCString s FFI.c_babl_format + +-- | Peek the number of bytes per pixel from a format. +babl_get_bpp + :: FFI.PixelFormat -- ^ Format to peek from + -> IO Int +babl_get_bpp form = do + (FFI.BablFormatPtr ptr) <- babl_format form + (CInt res) <- FFI.c_babl_get_bpp ptr + return $ fromIntegral res