GlyphLookup class

Stores the glyph index representing the code unit at index i.

Indices are in UTF-16 code unit space. When the source text contains non-BMP characters (emoji), codepoint indices from shaping are converted to UTF-16 indices during construction. The toUtf16 method performs the same codepoint-to-UTF-16 conversion for external callers.

Constructors

GlyphLookup(List<int> indices, [List<int>? _cpToUtf16])

GlyphLookup.fromShape(TextShapeResult shape, int codeUnitCount, {String? text})

Build a GlyphLookup from shaped text.

factory

Properties

hashCode → int

The hash code for this object.

no setter, inherited

indices → List<int>

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

advanceFactor(int index, bool inv) → double

How far this code unit index is within the glyph.

count(int index) → int

glyphStart(int index) → int

Returns the first codeunit index of the glyph cluster containing index.

isGlyphBoundary(int index) → bool

Whether index is at the start of a glyph cluster boundary (i.e. not in the middle of a multi-codepoint glyph).

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

toUtf16(int codePointIndex) → int

Convert a codepoint index (from TextRun.textIndexAt) to a UTF-16 code unit index. Returns the index unchanged when all characters are BMP.

Operators

operator ==(Object other) → bool

The equality operator.

inherited