{-# LANGUAGE CPP #-}
module Codec.Picture.Jpg.Internal.Metadata ( extractMetadatas, encodeMetadatas ) where
#if !MIN_VERSION_base(4,8,0)
import Control.Applicative( pure )
import Data.Monoid( mempty )
import Data.Word( Word )
#endif
import Data.Word( Word16 )
import Data.Maybe( fromMaybe )
import qualified Codec.Picture.Metadata as Met
import Codec.Picture.Metadata( Metadatas )
import Codec.Picture.Jpg.Internal.Types
scalerOfUnit :: JFifUnit -> Met.Keys Word -> Word16 -> Metadatas -> Metadatas
scalerOfUnit :: JFifUnit -> Keys Word -> Word16 -> Metadatas -> Metadatas
scalerOfUnit JFifUnit
unit Keys Word
k Word16
v = case JFifUnit
unit of
JFifUnit
JFifUnitUnknown -> forall a. a -> a
id
JFifUnit
JFifPixelsPerInch -> forall a.
(Show a, NFData a) =>
Keys a -> a -> Metadatas -> Metadatas
Met.insert Keys Word
k (forall a b. (Integral a, Num b) => a -> b
fromIntegral Word16
v)
JFifUnit
JFifPixelsPerCentimeter ->
forall a.
(Show a, NFData a) =>
Keys a -> a -> Metadatas -> Metadatas
Met.insert Keys Word
k (Word -> Word
Met.dotsPerCentiMeterToDotPerInch forall a b. (a -> b) -> a -> b
$ forall a b. (Integral a, Num b) => a -> b
fromIntegral Word16
v)
extractMetadatas :: JpgJFIFApp0 -> Metadatas
JpgJFIFApp0
jfif =
Keys Word -> Word16 -> Metadatas -> Metadatas
inserter Keys Word
Met.DpiX (JpgJFIFApp0 -> Word16
_jfifDpiX JpgJFIFApp0
jfif)
forall a b. (a -> b) -> a -> b
$ Keys Word -> Word16 -> Metadatas -> Metadatas
inserter Keys Word
Met.DpiY (JpgJFIFApp0 -> Word16
_jfifDpiY JpgJFIFApp0
jfif) forall a. Monoid a => a
mempty
where
inserter :: Keys Word -> Word16 -> Metadatas -> Metadatas
inserter = JFifUnit -> Keys Word -> Word16 -> Metadatas -> Metadatas
scalerOfUnit forall a b. (a -> b) -> a -> b
$ JpgJFIFApp0 -> JFifUnit
_jfifUnit JpgJFIFApp0
jfif
encodeMetadatas :: Metadatas -> [JpgFrame]
encodeMetadatas :: Metadatas -> [JpgFrame]
encodeMetadatas Metadatas
metas = forall a. a -> Maybe a -> a
fromMaybe [] forall a b. (a -> b) -> a -> b
$ do
Word
dpiX <- forall a. Keys a -> Metadatas -> Maybe a
Met.lookup Keys Word
Met.DpiX Metadatas
metas
Word
dpiY <- forall a. Keys a -> Metadatas -> Maybe a
Met.lookup Keys Word
Met.DpiY Metadatas
metas
forall (f :: * -> *) a. Applicative f => a -> f a
pure forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall (f :: * -> *) a. Applicative f => a -> f a
pure forall b c a. (b -> c) -> (a -> b) -> a -> c
. JpgJFIFApp0 -> JpgFrame
JpgJFIF forall a b. (a -> b) -> a -> b
$ JpgJFIFApp0
{ _jfifUnit :: JFifUnit
_jfifUnit = JFifUnit
JFifPixelsPerInch
, _jfifDpiX :: Word16
_jfifDpiX = forall a b. (Integral a, Num b) => a -> b
fromIntegral Word
dpiX
, _jfifDpiY :: Word16
_jfifDpiY = forall a b. (Integral a, Num b) => a -> b
fromIntegral Word
dpiY
, _jfifThumbnail :: Maybe Int
_jfifThumbnail = forall a. Maybe a
Nothing
}