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{- This Source Code Form is subject to the terms of the Mozilla Public License,
v. 2.0. If a copy of the MPL was not distributed with this file, You can
obtain one at https://mozilla.org/MPL/2.0/. -}
-- | Generic font types.
module Graphics.Fountainhead.Type
( F2Dot14(..)
, Fixed32(..)
, FWord
, UFWord
, fixed2Double
, newlineBuilder
, succIntegral
, ttfEpoch
) where
import qualified Data.Text.Lazy.Builder as Text.Builder
import Data.Bits ((.>>.), (.&.))
import Data.Int (Int16)
import Data.Word (Word16, Word32)
import Data.Time (Day(..))
import Data.Time.Calendar.OrdinalDate (fromOrdinalDate)
newtype Fixed32 = Fixed32 Word32
deriving (Eq, Show)
newtype F2Dot14 = F2Dot14 Int16
deriving (Eq, Show)
type FWord = Int16
type UFWord = Word16
ttfEpoch :: Day
ttfEpoch = fromOrdinalDate 1904 1
succIntegral :: Integral a => a -> Int
succIntegral = succ . fromIntegral
fixed2Double :: F2Dot14 -> Double
fixed2Double (F2Dot14 fixed) =
let mantissa = realToFrac (fixed .>>. 14)
fraction = realToFrac (fixed .&. 0x3fff) / 16384.0
in mantissa + fraction
newlineBuilder :: Text.Builder.Builder
newlineBuilder = Text.Builder.singleton '\n'
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