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-- ldgallery - A static generator which turns a collection of tagged
-- pictures into a searchable web gallery.
--
-- Copyright (C) 2019 Pacien TRAN-GIRARD
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as
-- published by the Free Software Foundation, either version 3 of the
-- License, or (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
-- along with this program. If not, see <https://www.gnu.org/licenses/>.
{-# LANGUAGE
DuplicateRecordFields
, DeriveGeneric
, DeriveAnyClass
, FlexibleContexts
#-}
module Processors
( Resolution(..)
, DirFileProcessor, dirFileProcessor
, ItemFileProcessor, itemFileProcessor
, ThumbnailFileProcessor, thumbnailFileProcessor
, skipCached, withCached
) where
import Control.Exception (Exception, throwIO)
import Data.Function ((&))
import Data.Ratio ((%))
import Data.Char (toLower)
import GHC.Generics (Generic)
import Data.Aeson (FromJSON)
import System.Directory hiding (copyFile)
import qualified System.Directory
import System.FilePath
import Codec.Picture
import Codec.Picture.Extra -- TODO: compare DCT and bilinear (and Lanczos, but it's not implemented)
import Resource
import Files
data ProcessingException = ProcessingException FilePath String deriving Show
instance Exception ProcessingException
data Format =
Bmp | Jpg | Png | Tiff | Hdr -- static images
| Gif -- TODO: might be animated
| Other
formatFromExt :: String -> Format
formatFromExt = aux . (map toLower)
where
aux ".bmp" = Bmp
aux ".jpg" = Jpg
aux ".jpeg" = Jpg
aux ".png" = Png
aux ".tiff" = Tiff
aux ".hdr" = Hdr
aux ".gif" = Gif
aux _ = Other
data Resolution = Resolution
{ width :: Int
, height :: Int } deriving (Show, Generic, FromJSON)
type FileProcessor =
FileName -- ^ Input path
-> FileName -- ^ Output path
-> IO ()
copyFileProcessor :: FileProcessor
copyFileProcessor inputPath outputPath =
(putStrLn $ "Copying:\t" ++ outputPath)
>> ensureParentDir (flip System.Directory.copyFile) outputPath inputPath
resizeStaticImageUpTo :: Format -> Resolution -> FileProcessor
resizeStaticImageUpTo Bmp = resizeStaticGeneric readBitmap saveBmpImage
-- TODO: parameterise export quality for jpg
resizeStaticImageUpTo Jpg = resizeStaticGeneric readJpeg (saveJpgImage 80)
resizeStaticImageUpTo Png = resizeStaticGeneric readPng savePngImage
resizeStaticImageUpTo Tiff = resizeStaticGeneric readTiff saveTiffImage
resizeStaticImageUpTo Hdr = resizeStaticGeneric readHDR saveRadianceImage
resizeStaticImageUpTo Gif = resizeStaticGeneric readGif writeGifImage
where
writeGifImage :: StaticImageWriter
writeGifImage outputPath image =
saveGifImage outputPath image
& either (throwIO . ProcessingException outputPath) id
type StaticImageReader = FilePath -> IO (Either String DynamicImage)
type StaticImageWriter = FilePath -> DynamicImage -> IO ()
resizeStaticGeneric :: StaticImageReader -> StaticImageWriter -> Resolution -> FileProcessor
resizeStaticGeneric reader writer maxRes inputPath outputPath =
(putStrLn $ "Generating:\t" ++ outputPath)
>> reader inputPath
>>= either (throwIO . ProcessingException inputPath) return
>>= return . (fitDynamicImage maxRes)
>>= ensureParentDir writer outputPath
fitDynamicImage :: Resolution -> DynamicImage -> DynamicImage
fitDynamicImage (Resolution boxWidth boxHeight) image =
convertRGBA8 image
& scaleBilinear targetWidth targetHeight
& ImageRGBA8
where
picWidth = dynamicMap imageWidth image
picHeight = dynamicMap imageHeight image
resizeRatio = min (boxWidth % picWidth) (boxHeight % picHeight)
targetWidth = floor $ resizeRatio * (picWidth % 1)
targetHeight = floor $ resizeRatio * (picHeight % 1)
type Cache = FileProcessor -> FileProcessor
skipCached :: Cache
skipCached processor inputPath outputPath =
removePathForcibly outputPath
>> processor inputPath outputPath
withCached :: Cache
withCached processor inputPath outputPath =
do
isDir <- doesDirectoryExist outputPath
if isDir then removePathForcibly outputPath else noop
fileExists <- doesFileExist outputPath
if fileExists then
do
needUpdate <- isOutdated True inputPath outputPath
if needUpdate then update else skip
else
update
where
noop = return ()
update = processor inputPath outputPath
skip = putStrLn $ "Skipping:\t" ++ outputPath
type DirFileProcessor =
FileName -- ^ Input base path
-> FileName -- ^ Output base path
-> FileName -- ^ Output class (subdir)
-> DirProcessor
dirFileProcessor :: DirFileProcessor
dirFileProcessor _ _ = (.) return . (/>)
type ItemFileProcessor =
FileName -- ^ Input base path
-> FileName -- ^ Output base path
-> FileName -- ^ Output class (subdir)
-> ItemProcessor
itemFileProcessor :: Maybe Resolution -> Cache -> ItemFileProcessor
itemFileProcessor maxRes cached inputBase outputBase resClass inputRes =
cached (processor maxRes (extOf inputRes)) inPath outPath
>> return relOutPath
where
extOf = formatFromExt . takeExtension . head
relOutPath = resClass /> inputRes
inPath = localPath $ inputBase /> inputRes
outPath = localPath $ outputBase /> relOutPath
processor :: Maybe Resolution -> Format -> FileProcessor
processor Nothing _ = copyFileProcessor
processor (Just maxRes) Bmp = resizeStaticImageUpTo Bmp maxRes
processor (Just maxRes) Jpg = resizeStaticImageUpTo Jpg maxRes
processor (Just maxRes) Png = resizeStaticImageUpTo Png maxRes
processor (Just maxRes) Tiff = resizeStaticImageUpTo Tiff maxRes
processor (Just maxRes) Hdr = resizeStaticImageUpTo Hdr maxRes
processor _ Gif = copyFileProcessor -- TODO: handle animated gif resizing
processor _ Other = copyFileProcessor -- TODO: handle video reencoding and others?
type ThumbnailFileProcessor =
FileName -- ^ Input base path
-> FileName -- ^ Output base path
-> FileName -- ^ Output class (subdir)
-> ThumbnailProcessor
thumbnailFileProcessor :: Resolution -> Cache -> ThumbnailFileProcessor
thumbnailFileProcessor maxRes cached inputBase outputBase resClass inputRes =
cached <$> processor (extOf inputRes)
& process
where
extOf = formatFromExt . takeExtension . head
relOutPath = resClass /> inputRes
inPath = localPath $ inputBase /> inputRes
outPath = localPath $ outputBase /> relOutPath
process :: Maybe FileProcessor -> IO (Maybe Path)
process Nothing = return Nothing
process (Just processor) =
processor inPath outPath
>> return (Just relOutPath)
processor :: Format -> Maybe FileProcessor
processor Bmp = Just $ resizeStaticImageUpTo Bmp maxRes
processor Jpg = Just $ resizeStaticImageUpTo Jpg maxRes
processor Png = Just $ resizeStaticImageUpTo Png maxRes
processor Tiff = Just $ resizeStaticImageUpTo Tiff maxRes
processor Hdr = Just $ resizeStaticImageUpTo Hdr maxRes
processor Gif = Just $ resizeStaticImageUpTo Gif maxRes -- static thumbnail from first frame
processor _ = Nothing
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