Font engine > Layout

THtLayout = record
public
   Font: TOTFFont;
   FontSize, LetterSpacing: single;
   Glyphs: array of THtLayoutGlyph;
   Flags: byte;
   StylisticSet: TOTFStylisticFeatures;
   FeatureSet: TOpentypeFeatures;
   FontStyle: THtFontStyles;
   function Width: single;
   function Ascent: single;
   function Descent: single;
   function AsSVG: string;
   procedure AsPath(P: THtPath);
   property RTL: boolean read GetRTL write SetRTL;
   property Kerning: boolean read GetKerning write SetKerning;
   property Substitution: boolean read GetSubstitution write SetSubstitution;
   property Positioning: boolean read GetPositioning write SetPositioning;
end;

THtLayoutGlyph = record
   Symbol code
   CID: cardinal;
   Glyph ID
   GID: word;
   Offset from default position
   DX, DY: Smallint;
   Width in font units
   Width: SmallInt;
end;

Glyphs

Layout glyphs. After calling PrepareLayout glyph number can change and will not correspond to initial text length.

Flags

Font flags. Use properties to get/set flags.

StylisticSet

Set of stylistic features (ss01..ss20) that should be processed during PrepareLayout

FeatureSet

Set of OpenType features that should be processed during PrepareLayout

FontStyle

Bold, Italic, Underline, Strikeout

Width

Total width of layout

Ascent

Ascent value

Descent

Descent value

AsSVG

Convert layout to SVG string

AsPath

Convert layout to SVG path

RTL

Layout contains right-to-left text

Kerning

Process kerning when prepare layout (Kern table)

Substitutions

Process glyph substitutions when prepare layout (ligatures, etc.GSUB table)

Positioning

Adjust glyphs positions when prepare layout (GPOS table)