Add kern table formats 1 and 2

src/Graphics/Fountainhead/TrueType.hs

@@ -779,8 +779,9 @@ data KernFormat0Pair = KernFormat0Pair
     } deriving (Eq, Show)
 
 data KernFormat0Table = KernFormat0Table
-    { nPairs :: Word16 -- ^ The number of kerning pairs in this subtable.
+    -- | The largest power of two less than or equal to the value of nPairs,
-    , 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.
+    -- multiplied by the size in bytes of an entry in the subtable.
+    { searchRange :: Word16
     -- | 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,
@@ -792,3 +793,56 @@ data KernFormat0Table = KernFormat0Table
     , rangeShift :: Word16
     , pairs :: [KernFormat0Pair]
     } deriving (Eq, Show)
+
+-- | Kern subtable format 1 header.
+data StateHeader = StateHeader
+    { stateSize :: Word16 -- ^ Number of classes defined for this table.
+    -- | Offset from the beginning of the state table to the beginning of the
+    -- class subtable.
+    , classTableOffset :: Word16
+    -- | Offset from the beginning of the state table to the beginning of the
+    -- state array.
+    , stateArrayOffset :: Word16
+    -- | Offset from the beginning of the state table to the beginning of the
+    -- entry subtable.
+    , entryTableOffset :: Word16
+    -- | Offset from the beginning of the state table to the beginning of the
+    -- state table values.
+    , valueOffset :: Word16
+    } deriving (Eq, Show)
+
+data StateEntry = StateEntry
+    { newState :: Word16
+    , flags :: Word16
+    } deriving (Eq, Show)
+
+data KernFormat1Table = KernFormat1Table
+    { stateHeader :: StateHeader
+    , firstGlyph :: Word16
+    , classArray :: ByteString
+    , stateArray :: ByteString
+    , entries :: [StateEntry]
+    } deriving (Eq, Show)
+
+data SimpleArrayHeader = SimpleArrayHeader
+    { rowWidth :: Word16 -- ^ The width, in bytes, of a row in the subtable.
+    -- | Offset from beginning of this subtable to the left-hand offset table.
+    , leftOffsetTable :: Word16
+    -- | Offset from beginning of this subtable to right-hand offset table.
+    , rightOffsetTable :: Word16
+    -- | Offset from beginning of this subtable to the start of the kerning
+    -- array.
+    , array :: Word16
+    } deriving (Eq, Show)
+
+data ClassTableHeader = ClassTableHeader
+    { firstGlyph -- ^ First glyph in class range.
+    -- | The offsets array for all of the glyphs in the range.
+    , offsets :: [Word16]
+    } deriving (Eq, Show)
+
+data KernFormat2Table = KernFormat2Table
+   { simpleArrayHeader :: SimpleArrayHeader
+   , classTableHeader :: ClassTableHeader
+   , values :: [Int16]
+   } deriving (Eq, Show)