Safe Haskell	None
Language	Haskell2010

Graphics.Text.TrueType.Internal

Description

This module provide internal access to many structure, not exported by default. The stability of this module is absolutely not insured.

Synopsis

Documentation

data Font #

Type representing a font.

Constructors

Font

Fields

_fontOffsetTable :: !OffsetTable
Field discribing various offsets/positions of table inside the font file. Not available for reading.
_fontTables :: ![(ByteString, ByteString)]
_fontNames :: Maybe NameTable
_fontHeader :: Maybe FontHeader
_fontMaxp :: Maybe MaxpTable
_fontMap :: Maybe CharacterMaps
_fontGlyph :: Maybe (Vector Glyph)
_fontLoca :: Maybe (Vector Word32)
_fontHorizontalHeader :: Maybe HorizontalHeader
_fontHorizontalMetrics :: Maybe HorizontalMetricsTable

Instances

Show Font #
Methods showsPrec :: Int -> Font -> ShowS # show :: Font -> String # showList :: [Font] -> ShowS #
NFData Font #
Methods rnf :: Font -> () #

data FontHeader #

Font header

Constructors

FontHeader

Fields

_fHdrVersionNumber :: !Fixed
Table version number 0x00010000 for version 1.0.
_fHdrFontRevision :: !Fixed
fontRevision Set by font manufacturer.
_fHdrChecksumAdjust :: !Word32
To compute: set it to 0, sum the entire font as ULONG, then store 0xB1B0AFBA - sum.
_fHdrMagicNumber :: !Word32
Should be equal to 0x5F0F3CF5.
_fHdrFlags :: !HeaderFlags
_fUnitsPerEm :: !Word16
Valid range is from 16 to 16384
_fHdrCreateTime :: !Word64
International date (8-byte field).
_fHdrModificationTime :: !Word64
International date (8-byte field).
_fHdrxMin :: !FWord
For all glyph bounding boxes.
_fHdrYMin :: !FWord
For all glyph bounding boxes.
_fHdrXMax :: !FWord
For all glyph bounding boxes.
_fHdrYMax :: !FWord
For all glyph bounding boxes.
_fHdrMacStyle :: !FontStyle
Bit 0 bold (if set to 1); Bit 1 italic (if set to 1)
_fHdrLowestRecPPEM :: !Word16
Smallest readable size in pixels.
_fHdrFontDirectionHint :: !Int16
0 Fully mixed directional glyphs; 1 Only strongly left to right; 2 Like 1 but also contains neutrals ; -1 Only strongly right to left; -2 Like -1 but also contains neutrals.
_fHdrIndexToLocFormat :: !Int16
0 for short offsets, 1 for long.
_fHdrGlyphDataFormat :: !Int16
0 for current format.

Instances

Eq FontHeader #
Methods (==) :: FontHeader -> FontHeader -> Bool # (/=) :: FontHeader -> FontHeader -> Bool #
Show FontHeader #
Methods showsPrec :: Int -> FontHeader -> ShowS # show :: FontHeader -> String # showList :: [FontHeader] -> ShowS #
Binary FontHeader #
Methods put :: FontHeader -> Put # get :: Get FontHeader # putList :: [FontHeader] -> Put #
NFData FontHeader #
Methods rnf :: FontHeader -> () #

data HeaderFlags #

Header flags.

Constructors

HeaderFlags

Fields

_hfBaselineY0 :: !Bool
Bit 0 - baseline for font at y=0;
_hfLeftSideBearing :: !Bool
Bit 1 - left sidebearing at x=0;
_hfInstrDependPointSize :: !Bool
Bit 2 - instructions may depend on point size;
_hfForcePPEM :: !Bool
Bit 3 - force ppem to integer values for all internal scaler math; may use fractional ppem sizes if this bit is clear;
_hfAlterAdvance :: !Bool
Bit 4 - instructions may alter advance width (the advance widths might not scale linearly);

Instances

Eq HeaderFlags #
Methods (==) :: HeaderFlags -> HeaderFlags -> Bool # (/=) :: HeaderFlags -> HeaderFlags -> Bool #
Show HeaderFlags #
Methods showsPrec :: Int -> HeaderFlags -> ShowS # show :: HeaderFlags -> String # showList :: [HeaderFlags] -> ShowS #
Binary HeaderFlags #
Methods put :: HeaderFlags -> Put # get :: Get HeaderFlags # putList :: [HeaderFlags] -> Put #

data HorizontalHeader #

Describe the "hhea" TrueType table.

Constructors

HorizontalHeader

Fields

_hheaAscent :: !FWord
Distance from baseline of highest ascender
_hheaDescent :: !FWord
Distance from baseline of lowest descender
_hheaLineGap :: !FWord
typographic line gap
_hheaAdvanceWidthMax :: !FWord
must be consistent with horizontal metrics
_hheaMinLeftSideBearing :: !FWord
must be consistent with horizontal metrics
_hheaMinRightSideBearing :: !FWord
must be consistent with horizontal metrics
_hheaXmaxExtent :: !FWord
max(lsb + (xMax-xMin))
_hheaCaretSlopeRise :: !Int16
used to calculate the slope of the caret (rise/run) set to 1 for vertical caret
_hheaCaretSlopeRun :: !Int16
0 for vertical
_hheaCaretOffset :: !FWord
set value to 0 for non-slanted fonts
_hheaMetricDataFormat :: !Int16
0 for current format
_hheaLongHorMetricCount :: !Word16
number of advance widths in metrics table

Instances

Eq HorizontalHeader #
Methods (==) :: HorizontalHeader -> HorizontalHeader -> Bool # (/=) :: HorizontalHeader -> HorizontalHeader -> Bool #
Show HorizontalHeader #
Methods showsPrec :: Int -> HorizontalHeader -> ShowS # show :: HorizontalHeader -> String # showList :: [HorizontalHeader] -> ShowS #
Binary HorizontalHeader #
Methods put :: HorizontalHeader -> Put # get :: Get HorizontalHeader # putList :: [HorizontalHeader] -> Put #
NFData HorizontalHeader #
Methods rnf :: HorizontalHeader -> () #

data HorizontalMetric #

Information of horizontal advance.

Constructors

HorizontalMetric
Fields _hmtxAdvanceWidth :: !Word16 _hmtxLeftSideBearing :: !Int16

Instances

Eq HorizontalMetric #
Methods (==) :: HorizontalMetric -> HorizontalMetric -> Bool # (/=) :: HorizontalMetric -> HorizontalMetric -> Bool #
Show HorizontalMetric #
Methods showsPrec :: Int -> HorizontalMetric -> ShowS # show :: HorizontalMetric -> String # showList :: [HorizontalMetric] -> ShowS #
Binary HorizontalMetric #
Methods put :: HorizontalMetric -> Put # get :: Get HorizontalMetric # putList :: [HorizontalMetric] -> Put #

data HorizontalMetricsTable #

For every glyph (indexed by the glyph index), provide horizontal information.

Constructors

HorizontalMetricsTable
Fields _glyphMetrics :: !(Vector HorizontalMetric)

Instances

Eq HorizontalMetricsTable #
Methods (==) :: HorizontalMetricsTable -> HorizontalMetricsTable -> Bool # (/=) :: HorizontalMetricsTable -> HorizontalMetricsTable -> Bool #
Show HorizontalMetricsTable #
Methods showsPrec :: Int -> HorizontalMetricsTable -> ShowS # show :: HorizontalMetricsTable -> String # showList :: [HorizontalMetricsTable] -> ShowS #

data MaxpTable #

Constructors

MaxpTable

Fields

_maxpTableVersion :: !Fixed
version number 0x00010000 for version 1.0.
_maxpnumGlyphs :: !Word16
The number of glyphs in the font.
_maxpmaxPoints :: !Word16
Maximum points in a non-composite glyph.
_maxpmaxContours :: !Word16
Maximum contours in a non-composite glyph.
_maxpmaxCompositePoints :: !Word16
Maximum points in a composite glyph.
_maxpmaxCompositeContours :: !Word16
Maximum contours in a composite glyph.
_maxpmaxZones :: !Word16
1 if instructions do not use the twilight zone (Z0), or 2 if instructions do use Z0; should be set to 2 in most cases.
_maxpmaxTwilightPoints :: !Word16
Maximum points used in Z0.
_maxpmaxStorage :: !Word16
Number of Storage Area locations.
_maxpmaxFunctionDefs :: !Word16
Number of FDEFs.
_maxpmaxInstructionDefs :: !Word16
Number of IDEFs.
_maxpmaxStackElements :: !Word16
Maximum stack depth .
_maxpmaxSizeOfInstructions :: !Word16
Maximum byte count for glyph instructions.
_maxpmaxComponentElements :: !Word16
Maximum number of components referenced at "top level" for any composite glyph.
_maxpmaxComponentDepth :: !Word16
Maximum levels of recursion; 1 for simple components.

Instances

Eq MaxpTable #
Methods (==) :: MaxpTable -> MaxpTable -> Bool # (/=) :: MaxpTable -> MaxpTable -> Bool #
Show MaxpTable #
Methods showsPrec :: Int -> MaxpTable -> ShowS # show :: MaxpTable -> String # showList :: [MaxpTable] -> ShowS #
Binary MaxpTable #
Methods put :: MaxpTable -> Put # get :: Get MaxpTable # putList :: [MaxpTable] -> Put #
NFData MaxpTable #
Methods rnf :: MaxpTable -> () #

newtype FWord #

Constructors

FWord Word16

Instances

Eq FWord #
Methods (==) :: FWord -> FWord -> Bool # (/=) :: FWord -> FWord -> Bool #
Show FWord #
Methods showsPrec :: Int -> FWord -> ShowS # show :: FWord -> String # showList :: [FWord] -> ShowS #
Binary FWord #
Methods put :: FWord -> Put # get :: Get FWord # putList :: [FWord] -> Put #

data Fixed #

Constructors

Fixed Word16 Word16

Instances

Eq Fixed #
Methods (==) :: Fixed -> Fixed -> Bool # (/=) :: Fixed -> Fixed -> Bool #
Show Fixed #
Methods showsPrec :: Int -> Fixed -> ShowS # show :: Fixed -> String # showList :: [Fixed] -> ShowS #
Binary Fixed #
Methods put :: Fixed -> Put # get :: Get Fixed # putList :: [Fixed] -> Put #