module Data.Text.ParagraphLayout.FontLoader (loadUbuntuRegular) where

import Data.ByteString (readFile)
import Data.Text.Glyphize
    (Font
    ,FontOptions(optionPPEm, optionScale)
    ,createFace
    ,createFontWithOptions
    ,defaultFontOptions
    )
import Prelude (IO, Int, Maybe(Just), String, Word, return)
import System.FilePath ((</>))

ubuntuRegularPath :: String
ubuntuRegularPath = "assets" </> "fonts" </> "ubuntu" </> "Ubuntu-R.ttf"

-- TODO: Figure out if this affects hinting!
testingPixelSize :: (Word, Word)
testingPixelSize = (24, 24)

-- This controls the output units.
-- The default is "unscaled", which uses the value of `faceUpem` in both axes.
testingScale :: (Int, Int)
testingScale = (1000, 1000)

loadUbuntuRegular :: IO Font
loadUbuntuRegular = do
    ttf <- readFile ubuntuRegularPath
    let face = createFace ttf 0
    let font = createFontWithOptions (defaultFontOptions {
        optionPPEm = Just testingPixelSize,
        optionScale = Just testingScale
    }) face
    return font