Graphics.Text.TrueType.Internal

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

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