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Diffstat (limited to 'src/Graphics/Fountainhead/TrueType.hs')
| -rw-r--r-- | src/Graphics/Fountainhead/TrueType.hs | 794 |
1 files changed, 794 insertions, 0 deletions
diff --git a/src/Graphics/Fountainhead/TrueType.hs b/src/Graphics/Fountainhead/TrueType.hs new file mode 100644 index 0000000..2b70841 --- /dev/null +++ b/src/Graphics/Fountainhead/TrueType.hs @@ -0,0 +1,794 @@ +{-# LANGUAGE DuplicateRecordFields #-} + +-- | Types representing a TrueType font. +module Graphics.Fountainhead.TrueType + ( BArmStyle(..) + , BContrast(..) + , BFamilyType(..) + , BLetterform(..) + , BMidline(..) + , BProportion(..) + , BSerifStyle(..) + , BStrokeVariation(..) + , BWeight(..) + , BXHeight(..) + , CVTable(..) + , CmapSubtable(..) + , CmapTable(..) + , CmapEncoding(..) + , CmapFormat0Table(..) + , CmapFormat2Subheader(..) + , CmapFormat2Table(..) + , CmapFormat4Table(..) + , CmapFormat6Table(..) + , CmapGroup(..) + , CmapFormat8Table(..) + , CmapFormat10Table(..) + , CmapFormat12Table(..) + , CmapFormat13Table + , CmapFormat14Table(..) + , ComponentGlyphFlags(..) + , ComponentGlyphPartDescription(..) + , CompoundGlyphDefinition(..) + , DeviceRecord(..) + , FpgmTable(..) + , FontDirectionHint(..) + , FontDirectory(..) + , FontStyle(..) + , GlyfTable(..) + , GlyphArgument(..) + , GlyphCoordinate(..) + , GlyphDefinition(..) + , GlyphDescription(..) + , GlyphTransformationOption(..) + , HdmxTable(..) + , HeadTable(..) + , HheaTable(..) + , HmtxTable(..) + , LocaTable(..) + , LongHorMetric(..) + , MaxpTable(..) + , NameRecord(..) + , NameTable(..) + , OffsetSubtable(..) + , OpenMaxpTable(..) + , Os2BaseFields(..) + , Os2MicrosoftFields(..) + , Os2Table(..) + , Os2Version1Fields(..) + , Os2Version4Fields(..) + , Os2Version5Fields(..) + , OutlineFlag(..) + , Panose(..) + , PostFormat2Table(..) + , PostHeader(..) + , PostSubtable(..) + , PostTable(..) + , PrepTable(..) + , SimpleGlyphDefinition(..) + , TableDirectory(..) + , TrueMaxpTable(..) + , UVSOffset(..) + , UVSMapping(..) + , UnicodeValueRange(..) + , VariationSelectorMap + , unLocaTable + ) where + +import Data.ByteString (ByteString) +import Data.Int (Int8, Int16) +import Data.IntMap (IntMap) +import Data.List.NonEmpty (NonEmpty(..)) +import Data.Time (LocalTime(..)) +import Data.Vector (Vector) +import Data.Word (Word8, Word16, Word32) +import Graphics.Fountainhead.Type (F2Dot14(..), Fixed32(..)) + +-- * Font directory + +data FontDirectory = FontDirectory + { offsetSubtable :: OffsetSubtable + , tableDirectory :: [TableDirectory] + } deriving (Eq, Show) + +data OffsetSubtable = OffsetSubtable + { scalerType :: Word32 + , numTables :: Int + , searchRange :: Word16 + , entrySelector :: Word16 + , rangeShift :: Word16 + } deriving (Eq, Show) + +data TableDirectory = TableDirectory + { tag :: ByteString + , checkSum :: Word32 + , offset :: Int + , length :: Int + } deriving (Eq, Show) + +-- * Name table + +data NameTable = NameTable + { format :: Word16 -- ^ Format selector. Set to 0. + , nameRecord :: [NameRecord] -- ^ The name records array. + , variable :: [ByteString] -- ^ The character strings of the names. + } deriving (Eq, Show) + +data NameRecord = NameRecord + { platformID :: Word16 -- ^ Platform identifier code. + , platformSpecificID :: Word16 -- ^ Platform-specific encoding identifier. + , languageID :: Word16 -- ^ Language identifier. + , nameID :: Word16 -- ^ Name identifier. + , length :: Int -- ^ Name string length in bytes. + , offset :: Int -- ^ Offset. + } deriving (Eq, Show) + +-- * 'cvt ' table + +newtype CVTable = CVTable [Int16] + deriving (Eq, Show) + +-- * Maximum profile table + +data TrueMaxpTable = TrueMaxpTable + { version :: Fixed32 -- ^ 0x00010000 (1.0). + , numGlyphs :: Word16 -- ^ The number of glyphs in the font. + , maxPoints :: Word16 -- ^ Points in non-compound glyph. + , maxContours :: Word16 -- ^ Contours in non-compound glyph. + , maxComponentPoints :: Word16 -- ^ Points in compound glyph. + , maxComponentContours :: Word16 -- ^ Contours in compound glyph. + , maxZones :: Word16 -- ^ Set to 2. + , maxTwilightPoints :: Word16 -- ^ Points used in Twilight Zone (Z0). + , maxStorage :: Word16 -- ^ Number of Storage Area locations. + , maxFunctionDefs :: Word16 -- ^ Number of FDEFs. + , maxInstructionDefs :: Word16 -- ^ Number of IDEFs. + , maxStackElements :: Word16 -- ^ Maximum stack depth. + , maxSizeOfInstructions :: Word16 -- ^ Byte count for glyph instructions. + , maxComponentElements :: Word16 -- ^ Number of glyphs referenced at top level. + , maxComponentDepth :: Word16 -- ^ Levels of recursion, set to 0 if font has only simple glyphs. + } deriving (Eq, Show) + +data OpenMaxpTable = OpenMaxpTable + { version :: Fixed32 -- ^ 0x00005000 (0.5). + , numGlyphs :: Word16 -- ^ The number of glyphs in the font. + } deriving (Eq, Show) + +data MaxpTable = OpenMaxp OpenMaxpTable | TrueMaxp TrueMaxpTable + deriving (Eq, Show) + +-- * Horizontal header table + +data HheaTable = HheaTable + { version :: Fixed32 -- ^ 0x00010000 (1.0). + , ascent :: Int16 -- ^ Distance from baseline of highest ascender. + , descent :: Int16 -- ^ Distance from baseline of lowest descender. + , lineGap :: Int16 -- ^ Typographic line gap. + , advanceWidthMax :: Word16 -- ^ Must be consistent with horizontal metrics. + , minLeftSideBearing :: Word16 -- ^ Must be consistent with horizontal metrics. + , minRightSideBearing :: Word16 -- ^ Must be consistent with horizontal metrics. + , xMaxExtent :: Word16 -- ^ max(lsb + (xMax-xMin)). + , caretSlopeRise :: Int16 -- ^ used to calculate the slope of the caret (rise/run) set to 1 for vertical caret. + , caretSlopeRun :: Int16 -- ^ 0 for vertical. + , caretOffset :: Int16 -- ^ Set value to 0 for non-slanted fonts. + , metricDataFormat :: Int16 -- ^ 0 for current format. + , numOfLongHorMetrics :: Word16 -- ^ Number of advance widths in metrics table. + } deriving (Eq, Show) + +-- * Font header table + +data HeadTable = HeadTable + { version :: Fixed32 -- ^ 0x00010000 if (version 1.0). + , fontRevision :: Fixed32 -- ^ Set by font manufacturer. + , checkSumAdjustment :: Word32 -- ^ To compute: set it to 0, calculate the checksum for the 'head' table and put it in the table directory, sum the entire font as a uint32_t, then store 0xB1B0AFBA - sum. (The checksum for the 'head' table will be wrong as a result. That is OK; do not reset it.) + , magicNumber :: Word32 -- ^ Set to 0x5F0F3CF5. + , flags :: Word16 + , unitsPerEm :: Word16 -- ^ Range from 64 to 16384. + , created :: LocalTime -- ^ International date. + , modified :: LocalTime -- ^ International date. + , xMin :: Int16 -- ^ For all glyph bounding boxes. + , yMin :: Int16 -- ^ For all glyph bounding boxes. + , xMax :: Int16 -- ^ For all glyph bounding boxes. + , yMax :: Int16 -- ^ For all glyph bounding boxes. + , macStyle :: FontStyle + , lowestRecPPEM :: Word16 -- ^ Smallest readable size in pixels. + , fontDirectionHint :: FontDirectionHint -- ^ 0 Mixed directional glyphs. + , indexToLocFormat :: Word16 -- ^ 0 for short offsets, 1 for long. + , glyphDataFormat :: Word16 -- ^ 0 for current format. + } deriving (Eq, Show) + +data FontStyle = FontStyle + { bold :: Bool + , italic :: Bool + , underline :: Bool + , outline :: Bool + , shadow :: Bool + , condensed :: Bool + , extended :: Bool + } deriving (Eq, Show) + +data FontDirectionHint + = MixedDirectionalGlyphs -- ^ 0. Mixed directional glyphs. + | StronglyLeftToRightGlyphs -- ^ 1. Only strongly left to right glyphs. + | LeftToRightGlyphsWithNeutrals -- ^ 2. Like 1 but also contains neutrals. + | StronglyRightToLeftGlyphs -- ^ -1. Only strongly right to left glyphs. + | RightToLeftGlyphsWithNeutrals -- ^ -2. Like -1 but also contains neutrals. + deriving (Eq, Show) + +data LocaTable + = ShortLocaTable (Vector Word16) + | LongLocaTable (Vector Word32) + deriving (Eq, Show) + +unLocaTable :: LocaTable -> Vector Word32 +unLocaTable (LongLocaTable values) = values +unLocaTable (ShortLocaTable values) = (* 2) . fromIntegral <$> values + +-- * Horizontal metrics table + +data LongHorMetric = LongHorMetric + { advanceWidth :: Word16 + , leftSideBearing :: Int16 + } deriving (Eq, Show) + +data HmtxTable = HmtxTable + { hMetrics :: NonEmpty LongHorMetric + , leftSideBearing :: [Int16] + } deriving (Eq, Show) + +-- * Glyph name and PostScript font table + +data PostHeader = PostHeader + { format :: Fixed32 -- ^ Format of this table + , italicAngle :: Fixed32 -- ^ Italic angle in degrees + , underlinePosition :: Int16 -- ^ Underline position + , underlineThickness :: Int16 -- ^ Underline thickness + , isFixedPitch :: Word32 -- ^ Font is monospaced; set to 1 if the font is monospaced and 0 otherwise (N.B., to maintain compatibility with older versions of the TrueType spec, accept any non-zero value as meaning that the font is monospaced) + , minMemType42 :: Word32 -- ^ Minimum memory usage when a TrueType font is downloaded as a Type 42 font + , maxMemType42 :: Word32 -- ^ Maximum memory usage when a TrueType font is downloaded as a Type 42 font + , minMemType1 :: Word32 -- ^ Minimum memory usage when a TrueType font is downloaded as a Type 1 font + , maxMemType1 :: Word32 -- ^ Maximum memory usage when a TrueType font is downloaded as a Type 1 font + } deriving (Eq, Show) + +data PostFormat2Table = PostFormat2Table + { glyphNameIndex :: Vector Word16 -- ^ Ordinal number of this glyph in 'post' string tables. This is not an offset. + , names :: Vector ByteString + } deriving (Eq, Show) + +data PostSubtable + = None + | PostFormat2 PostFormat2Table + | PostFormat25 (Vector Int8) + | PostFormat4 (Vector Word16) + deriving (Eq, Show) + +data PostTable = PostTable + { postHeader :: PostHeader + , postSubtable :: PostSubtable + } deriving (Eq, Show) + +-- * Font program table + +newtype FpgmTable = FpgmTable (Vector Word8) + deriving (Eq, Show) + +-- * Prep table + +newtype PrepTable = PrepTable (Vector Word8) + deriving (Eq, Show) + +-- * Horizontal device metrics table + +data HdmxTable = HdmxTable + { format :: Int16 -- ^ Format version number. + , records :: [DeviceRecord] + } deriving (Eq, Show) + +data DeviceRecord = DeviceRecord + { pixelSize :: Word8 -- ^ Pixel size for following widths. + , maximumWidth :: Word8 -- ^ Maximum width. + , widths :: Vector Word8 -- ^ Widths. + } deriving (Eq, Show) + +-- * Glyph outline table + +data GlyphDescription = GlyphDescription + { numberOfContours :: Int + , xMin :: Int16 -- ^ Minimum x for coordinate data. + , yMin :: Int16 -- ^ Minimum y for coordinate data. + , xMax :: Int16 -- ^ Maximum x for coordinate data. + , yMax :: Int16 -- ^ Maximum y for coordinate data. + , definition :: GlyphDefinition + } deriving (Eq, Show) + +data GlyphArgument + = GlyphInt16Argument Int16 + | GlyphWord16Argument Word16 + | GlyphInt8Argument Int8 + | GlyphWord8Argument Word8 + deriving (Eq, Show) + +data GlyphTransformationOption + = GlyphNoScale + | GlyphScale F2Dot14 + | GlyphXyScale F2Dot14 F2Dot14 + | Glyph2By2Scale F2Dot14 F2Dot14 F2Dot14 F2Dot14 + deriving (Eq, Show) + +data SimpleGlyphDefinition = SimpleGlyphDefinition + -- | Array of last points of each contour; n is the number of contours; + -- array entries are point indices. + { endPtsOfContours :: Vector Word16 + -- | Array of instructions for this glyph. + , instructions :: Vector Word8 + -- | Array of coordinates; the first is relative to (0,0), others are + -- relative to previous point. + , coordinates :: Vector GlyphCoordinate + } deriving (Eq, Show) + +data CompoundGlyphDefinition = CompoundGlyphDefinition + { components :: Vector ComponentGlyphPartDescription + , instructions :: Vector Word8 + } deriving (Eq, Show) + +data GlyphDefinition + = SimpleGlyph SimpleGlyphDefinition + | CompoundGlyph CompoundGlyphDefinition + deriving (Eq, Show) + +data ComponentGlyphFlags = ComponentGlyphFlags + { roundXyToGrid :: Bool + , weHaveInstructions :: Bool + , useMyMetrics :: Bool + , overlapCompound :: Bool + } deriving (Eq, Show) + +data GlyphCoordinate = GlyphCoordinate + { coordinateX :: Int16 + , coordinateY :: Int16 + , onCurve :: Bool + } deriving (Eq, Show) + +data ComponentGlyphPartDescription = ComponentGlyphPartDescription + { flags :: ComponentGlyphFlags + , glyphIndex :: Word16 + , argument1 :: GlyphArgument + , argument2 :: GlyphArgument + , transformationOption :: GlyphTransformationOption + } deriving (Eq, Show) + +-- * Glyph outline table + +data OutlineFlag = OutlineFlag + { onCurve :: Bool + , xShortVector :: Bool + , yShortVector :: Bool + , thisXIsSame :: Bool + , thisYIsSame :: Bool + } deriving (Eq, Show) + +newtype GlyfTable = GlyfTable (Vector GlyphDescription) + deriving (Eq, Show) + +-- * Character to glyph mapping table + +data CmapTable = CmapTable + { version :: Word16 -- ^ Version number is zero. + -- | Encodings with an offset into subtables map. + , encodings :: [CmapEncoding] + -- ^ The key into the map is the offset in the 'CmapEncoding's. + , subtables :: IntMap CmapSubtable + } deriving (Eq, Show) + +data CmapEncoding = CmapEncoding + { platformID :: Word16 -- ^ Platform identifier + , platformSpecificID :: Word16 -- ^ Platform-specific encoding identifier. + , offset :: Word32 -- ^ Offst of the mapping table. + } deriving (Eq, Show) + +data CmapFormat0Table = CmapFormat0Table + { language :: Word16 -- ^ Language code. + , glyphIndexArray :: Vector Word8 -- ^ An array that maps character codes to glyph index values. + } deriving (Eq, Show) + +data CmapFormat2Subheader = CmapFormat2Subheader + { firstCode :: Word16 + , entryCount :: Word16 + , idDelta :: Int16 + , idRangeOffset :: Word16 + } deriving (Eq, Show) + +data CmapFormat2Table = CmapFormat2Table + { language :: Word16 -- ^ Language code. + , subHeaderKeys :: Vector Word16 -- ^ Array that maps high bytes to subHeaders: value is index * 8. + , subHeaders :: Vector CmapFormat2Subheader -- ^ Variable length array of subHeader structures. + , glyphIndexArray :: Vector Word16 -- ^ Variable length array containing subarrays. + } deriving (Eq, Show) + +data CmapFormat4Table = CmapFormat4Table + { language :: Word16 -- ^ Language code. + , searchRange :: Word16 -- ^ 2 * (2**FLOOR(log2(segCount))). + , entrySelector :: Word16 -- ^ log2(searchRange/2). + , rangeShift :: Word16 -- ^ (2 * segCount) - searchRange. + , endCode :: Vector Word16 -- ^ Ending character code for each segment, last = 0xFFFF. + , startCode :: Vector Word16 -- ^ Starting character code for each segment. + , idDelta :: Vector Word16 -- ^ Delta for all character codes in segment. + , idRangeOffset :: Vector Word16 -- ^ Offset in bytes to glyph indexArray, or 0. + , glyphIndexArray :: Vector Word16 -- ^ Glyph index array. + } deriving (Eq, Show) + +data CmapFormat6Table = CmapFormat6Table + { language :: Word16 -- ^ Language code. + , firstCode :: Word16 -- ^ First character code of subrange. + , glyphIndexArray :: Vector Word16 -- ^ Array of glyph index values for character codes in the range + } deriving (Eq, Show) + +data CmapGroup = CmapGroup + -- | First character code in this group; note that if this group is for one + -- or more 16-bit character codes (which is determined from the is32 array), + -- this 32-bit value will have the high 16-bits set to zero. + { startCharCode :: Word32 + -- | Last character code in this group; same condition as listed above for + -- the startCharCode. + , endCharCode :: Word32 + -- | Glyph index corresponding to the starting character code. + , startGlyphCode :: Word32 + } deriving (Eq, Show) + +data CmapFormat8Table = CmapFormat8Table + { language :: Word32 -- ^ Language code. + -- | Tightly packed array of bits (8K bytes total) indicating whether the + -- particular 16-bit (index) value is the start of a 32-bit character code. + , is32 :: [Word8] + -- | Word32 Number of groupings which follow. + , groups :: Vector CmapGroup + } deriving (Eq, Show) + +data CmapFormat10Table = CmapFormat10Table + { language :: Word32 -- ^ Language code. + , startCharCode :: Word32 -- ^ First character code covered. + , numChars :: Word32 -- ^ Number of character codes covered. + , glyphs :: Vector Word16 -- ^ Array of glyph indices for the character codes covered. + } deriving (Eq, Show) + +data CmapFormat12Table = CmapFormat12Table + { language :: Word32 -- ^ Language code. + , groups :: Vector CmapGroup + } deriving (Eq, Show) + +type CmapFormat13Table = CmapFormat12Table + +newtype CmapFormat14Table = CmapFormat14Table + { varSelectorRecords :: VariationSelectorMap + } deriving (Eq, Show) + +data CmapSubtable + = CmapFormat0 CmapFormat0Table + | CmapFormat2 CmapFormat2Table + | CmapFormat4 CmapFormat4Table + | CmapFormat6 CmapFormat6Table + | CmapFormat8 CmapFormat8Table + | CmapFormat10 CmapFormat10Table + | CmapFormat12 CmapFormat12Table + | CmapFormat13 CmapFormat13Table + | CmapFormat14 CmapFormat14Table + deriving (Eq, Show) + +data UVSOffset a b = DefaultUVSOffset Word32 a | NonDefaultUVSOffset Word32 b + deriving (Eq, Show) + +data UVSMapping = UVSMapping + { unicodeValue :: Word32 -- ^ Base Unicode value of the UVS. + , glyphID :: Word16 -- ^ Glyph ID of the UVS. + } deriving (Eq, Show) + +data UnicodeValueRange = UnicodeValueRange + { startUnicodeValue :: Word32 -- ^ First value in this range. + , additionalCount :: Word8 -- ^ Number of additional values in this range. + } deriving (Eq, Show) + +-- | Mapping from variation selector record offsets to the record data. +type VariationSelectorMap = IntMap + (NonEmpty (UVSOffset (Vector UnicodeValueRange) (Vector UVSMapping))) + +-- * OS/2 table + +data Os2Table + = Os2Version0 Os2BaseFields (Maybe Os2MicrosoftFields) + | Os2Version1 Os2BaseFields Os2MicrosoftFields Os2Version1Fields + | Os2Version2 Os2BaseFields Os2MicrosoftFields Os2Version4Fields + | Os2Version3 Os2BaseFields Os2MicrosoftFields Os2Version4Fields + | Os2Version4 Os2BaseFields Os2MicrosoftFields Os2Version4Fields + | Os2Version5 Os2BaseFields Os2MicrosoftFields Os2Version5Fields + deriving (Eq, Show) + +data Os2Version1Fields = Os2Version1Fields + { ulCodePageRange1 :: Word32 + , ulCodePageRange2 :: Word32 + } deriving (Eq, Show) + +data Os2MicrosoftFields = Os2MicrosoftFields + { sTypoAscender :: Int16 + , sTypoDescender :: Int16 + , sTypoLineGap :: Int16 + , usWinAscent :: Word16 + , usWinDescent :: Word16 + } deriving (Eq, Show) + +data Os2Version4Fields = Os2Version4Fields + { ulCodePageRange1 :: Word32 + , ulCodePageRange2 :: Word32 + , sxHeight :: Int16 + , sCapHeight :: Int16 + , usDefaultChar :: Word16 + , usBreakChar :: Word16 + , usMaxContext :: Word16 + } deriving (Eq, Show) + +data Os2Version5Fields = Os2Version5Fields + { ulCodePageRange1 :: Word32 + , ulCodePageRange2 :: Word32 + , sxHeight :: Int16 + , sCapHeight :: Int16 + , usDefaultChar :: Word16 + , usBreakChar :: Word16 + , usMaxContext :: Word16 + , usLowerOpticalPointSize :: Word16 + , usUpperOpticalPointSize :: Word16 + } deriving (Eq, Show) + +data Os2BaseFields = Os2BaseFields + { version :: Word16 -- ^ Table version number (set to 0). + -- | Average weighted advance width of lower case letters and space. + , xAvgCharWidth :: Int16 + -- | Visual weight (degree of blackness or thickness) of stroke in glyphs. + , usWeightClass :: Word16 + -- | Relative change from the normal aspect ratio (width to height ratio) + -- as specified by a font designer for the glyphs in the font. + , usWidthClass :: Word16 + -- | Characteristics and properties of this font (set undefined bits to + -- zero). + , fsType :: Int16 + -- | Recommended horizontal size in pixels for subscripts. + , ySubscriptXSize :: Int16 + -- | Recommended vertical size in pixels for subscripts. + , ySubscriptYSize :: Int16 + -- | Recommended horizontal offset for subscripts. + , ySubscriptXOffset :: Int16 + -- | Recommended vertical offset form the baseline for subscripts. + , ySubscriptYOffset :: Int16 + -- | Recommended horizontal size in pixels for superscripts. + , ySuperscriptXSize :: Int16 + -- | Recommended vertical size in pixels for superscripts. + , ySuperscriptYSize :: Int16 + -- | Recommended horizontal offset for superscripts. + , ySuperscriptXOffset :: Int16 + -- | Recommended vertical offset from the baseline for superscripts. + , ySuperscriptYOffset :: Int16 + -- | Width of the strikeout stroke. + , yStrikeoutSize :: Int16 + -- | Position of the strikeout stroke relative to the baseline. + , yStrikeoutPosition :: Int16 + -- ^ Classification of font-family design. + , sFamilyClass :: Int16 + -- | 10 byte series of number used to describe the visual characteristics + -- of a given typeface. + , panose :: Panose + -- | Field is split into two bit fields of 96 and 36 bits each. The low 96 + -- bits are used to specify the Unicode blocks encompassed by the font file. + -- The high 32 bits are used to specify the character or script sets covered + -- by the font file. Bit assignments are pending. Set to 0. + , ulUnicodeRange :: Vector Word32 + -- | Four character identifier for the font vendor. + , achVendID :: Vector Int8 + -- | 2-byte bit field containing information concerning the nature of the + -- font patterns. + , fsSelection :: Word16 + -- | The minimum Unicode index in this font. + , fsFirstCharIndex :: Word16 + -- | The maximum Unicode index in this font. + , fsLastCharIndex :: Word16 + } deriving (Eq, Show) + +data Panose = Panose + { bFamilyType :: BFamilyType + , bSerifStyle :: BSerifStyle + , bWeight :: BWeight + , bProportion :: BProportion + , bContrast :: BContrast + , bStrokeVariation :: BStrokeVariation + , bArmStyle :: BArmStyle + , bLetterform :: BLetterform + , bMidline :: BMidline + , bXHeight :: BXHeight + } deriving (Eq, Show) + +data BFamilyType + = AnyFamilyType + | NoFitFamilyType + | TextAndDisplayFamilyType + | ScriptFamilyType + | DecorativeFamilyType + | PictorialFamilyType + deriving (Eq, Show) + +data BSerifStyle + = AnySerifStyle + | NoFitSerifStyle + | CoveSerifStyle + | ObtuseCoveSerifStyle + | SquareCoveSerifStyle + | ObtuseSquareCoveSerifStyle + | SquareSerifStyle + | ThinSerifStyle + | BoneSerifStyle + | ExaggeratedSerifStyle + | TriangleSerifStyle + | NormalSansSerifStyle + | ObtuseSansSerifStyle + | PerpSansSerifStyle + | FlaredSerifStyle + | RoundedSerifStyle + deriving (Eq, Show) + +data BWeight + = AnyWeight + | NoFitWeight + | VeryLightWeight + | LightWeight + | ThinWeight + | BookWeight + | MediumWeight + | DemiWeight + | BoldWeight + | HeavyWeight + | BlackWeight + | NordWeight + deriving (Eq, Show) + +data BProportion + = AnyProportion + | NoFitProportion + | OldStyleProportion + | ModernProportion + | EvenWidthProportion + | ExpandedProportion + | CondensedProportion + | VeryExpandedProportion + | VeryCondensedProportion + | MonospacedProportion + deriving (Eq, Show) + +data BContrast + = AnyContrast + | NoFitContrast + | NoneContrast + | VeryLowContrast + | LowContrast + | MediumLowContrast + | MediumContrast + | MediumHighContrast + | HighContrast + | VeryHighContrast + deriving (Eq, Show) + +data BStrokeVariation + = AnyStrokeVariatoon + | NoFitStrokeVariatoon + | GradualDiagonalStrokeVariatoon + | GradualTransitionalStrokeVariatoon + | GradualVerticalStrokeVariatoon + | GradualHorizontalStrokeVariatoon + | RapidVerticalStrokeVariatoon + | RapidHorizontalStrokeVariatoon + | InstantVerticalStrokeVariatoon + deriving (Eq, Show) + +data BArmStyle + = AnyArmStyle + | NoFitArmStyle + | StraightArmsHorizontalArmStyle + | StraightArmsWedgeArmStyle + | StraightArmsVerticalArmStyle + | StraightArmsSingleSerifArmStyle + | StraightArmsDoubleSerifArmStyle + | NonStraightArmsHorizontalArmStyle + | NonStraightArmsWedgeArmStyle + | NonStraightArmsVerticalArmStyle + | NonStraightArmsSingleSerifArmStyle + | NonStraightArmsDoubleSerifArmStyle + deriving (Eq, Show) + +data BLetterform + = AnyLetterform + | NoFitLetterform + | NormalContactLetterform + | NormalWeightedLetterform + | NormalBoxedLetterform + | NormalFlattenedLetterform + | NormalRoundedLetterform + | NormalOffCenterLetterform + | NormalSquareLetterform + | ObliqueContactLetterform + | ObliqueWeightedLetterform + | ObliqueBoxedLetterform + | ObliqueFlattenedLetterform + | ObliqueRoundedLetterform + | ObliqueOffCenterLetterform + | ObliqueSquareLetterform + deriving (Eq, Show) + +data BMidline + = AnyMidline + | NoFitMidline + | StandardTrimmedMidline + | StandardPointedMidline + | StandardSerifedMidline + | HighTrimmedMidline + | HighPointedMidline + | HighSerifedMidline + | ConstantTrimmedMidline + | ConstantPointedMidline + | ConstantSerifedMidline + | LowTrimmedMidline + | LowPointedMidline + | LowSerifedMidline + deriving (Eq, Show) + +data BXHeight + = AnyXHeight + | NoFitXHeight + | ConstantSmallXHeight + | ConstantStandardXHeight + | ConstantLargeXHeight + | DuckingSmallXHeight + | DuckingStandardXHeight + | DuckingLargeXHeight + deriving (Eq, Show) + +-- * Kern table + +data KernHeader = KernHeader + { version :: Fixed32 -- ^ The version number of the kerning table (0x00010000 for the current version). + } deriving (Eq, Show) + +data KernSubtableHeader = KernSubtableHeader + -- | The length of this subtable in bytes, including this header. + { length :: Word32 + -- | Circumstances under which this table is used. + , coverage :: [Coverage] + -- | The tuple index (used for variations fonts). This value specifies which + -- tuple this subtable covers. + , tupleIndex :: Word16 + } deriving (Eq, Show) + +data Coverage + = KernVertical -- ^ Set if table has vertical kerning values. + | KernCrossStream -- ^ Set if table has cross-stream kerning values. + | KernVariation -- ^ Set if table has variation kerning values. + | KernUnusedBits -- ^ Set to 0. + | KernFormatMask -- ^ Set the format of this subtable (0-3 currently defined). + deriving (Eq, Show) + +data KernFormat0Pair = KernFormat0Pair + { left :: Word16 -- ^ The glyph index for the lefthand glyph in the kerning pair. + , right :: Word16 -- ^ The glyph index for the righthand glyph in the kerning pair. + -- | The kerning value in FUnits for the left and right pair in FUnits. + -- If this value is greater than zero, the glyphs are moved apart. + -- If this value is less than zero, the glyphs are moved together. + , value :: Int16 + } deriving (Eq, Show) + +data KernFormat0Table = KernFormat0Table + { nPairs :: Word16 -- ^ The number of kerning pairs in this subtable. + , searchRange :: Word16 -- ^ The largest power of two less than or equal to the value of nPairs, multiplied by the size in bytes of an entry in the subtable. + -- | This is calculated as log2 of the largest power of two less than or + -- equal to the value of nPairs. This value indicates how many iterations of + -- the search loop have to be made. For example, in a list of eight items, + -- there would be three iterations of the loop. + , entrySelector :: Word16 + -- | The value of nPairs minus the largest power of two less than or equal + -- to nPairs. This is multiplied by the size in bytes of an entry in the + -- table. + , rangeShift :: Word16 + , pairs :: [KernFormat0Pair] + } deriving (Eq, Show) |