THPDFHeadlessShapedGlyph

A glyph from HPDFHeadlessShaping contains GlyphID, Advance, XOffset, and YOffset in the 1000-unit font coordinate system

UnicodeText retains its complete logical UTF-16 cluster, including ligatures and combining sequences; SourceOffset is the zero-based UTF-16 offset in the paragraph input after any requested wrapping

LineBreak marks a paragraph boundary instead of a drawable glyph; its geometry fields are zero