diff options
Diffstat (limited to 'src/Text/Pandoc/ImageSize.hs')
| -rw-r--r-- | src/Text/Pandoc/ImageSize.hs | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/src/Text/Pandoc/ImageSize.hs b/src/Text/Pandoc/ImageSize.hs index 1d6db8dfa..4c76aac13 100644 --- a/src/Text/Pandoc/ImageSize.hs +++ b/src/Text/Pandoc/ImageSize.hs @@ -71,7 +71,7 @@ import Data.Maybe (fromMaybe) -- quick and dirty functions to get image sizes -- algorithms borrowed from wwwis.pl -data ImageType = Png | Gif | Jpeg | Svg | Pdf | Eps deriving Show +data ImageType = Png | Gif | Jpeg | Svg | Pdf | Eps | Emf deriving Show data Direction = Width | Height instance Show Direction where show Width = "width" @@ -125,6 +125,9 @@ imageType img = case B.take 4 img of "%!PS" | B.take 4 (B.drop 1 $ B.dropWhile (/=' ') img) == "EPSF" -> return Eps + "\x01\x00\x00\x00" + | B.take 4 (B.drop 40 img) == " EMF" + -> return Emf _ -> mzero findSvgTag :: ByteString -> Bool @@ -139,6 +142,7 @@ imageSize opts img = Just Svg -> mbToEither "could not determine SVG size" $ svgSize opts img Just Eps -> mbToEither "could not determine EPS size" $ epsSize img Just Pdf -> mbToEither "could not determine PDF size" $ pdfSize img + Just Emf -> mbToEither "could not determine EMF size" $ emfSize img Nothing -> Left "could not determine image type" where mbToEither msg Nothing = Left msg mbToEither _ (Just x) = Right x @@ -357,6 +361,38 @@ svgSize opts img = do , dpiX = dpi , dpiY = dpi } + +emfSize :: ByteString -> Maybe ImageSize +emfSize img = + let + parseheader = runGetOrFail $ do + skip 0x18 -- 0x00 + frameL <- getWord32le -- 0x18 measured in 1/100 of a millimetre + frameT <- getWord32le -- 0x1C + frameR <- getWord32le -- 0x20 + frameB <- getWord32le -- 0x24 + skip 0x20 -- 0x28 + deviceX <- getWord32le -- 0x48 pixels of reference device + deviceY <- getWord32le -- 0x4C + mmX <- getWord32le -- 0x50 real mm of reference device (always 320*240?) + mmY <- getWord32le -- 0x58 + -- end of header + let + w = (deviceX * (frameR - frameL)) `quot` (mmX * 100) + h = (deviceY * (frameB - frameT)) `quot` (mmY * 100) + dpiW = (deviceX * 254) `quot` (mmX * 10) + dpiH = (deviceY * 254) `quot` (mmY * 10) + return $ ImageSize + { pxX = fromIntegral w + , pxY = fromIntegral h + , dpiX = fromIntegral dpiW + , dpiY = fromIntegral dpiH + } + in + case parseheader . BL.fromStrict $ img of + Left _ -> Nothing + Right (_, _, size) -> Just size + jpegSize :: ByteString -> Either String ImageSize jpegSize img = |