Ilia Mashkov
88 lines
2.1 KiB
TypeScript
88 lines
2.1 KiB
TypeScript
/**
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* Internal shape of pretext's PreparedTextWithSegments — only `segments` is in
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* pretext's public TS type; the numeric arrays exist at runtime but are not in
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* the published signature. Verified against node_modules/@chenglou/pretext/src/layout.ts.
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*/
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interface PretextInternals {
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/**
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* Per-segment text.
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*/
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segments: string[];
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/**
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* Per-segment full width in pixels.
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*/
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widths: number[];
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/**
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* Per-segment per-grapheme advance widths, or null when the segment is a single grapheme.
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*/
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breakableFitAdvances: (number[] | null)[];
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/**
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* Per-segment line-end fit advance.
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*/
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lineEndFitAdvances: number[];
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/**
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* Per-segment line-end paint advance.
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*/
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lineEndPaintAdvances: number[];
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}
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/**
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* Per-grapheme data computed during dual-font layout. Internal to the engine;
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* consumed by computeLineRenderModel to derive the per-frame render model.
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*/
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export interface ComparisonChar {
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/**
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* Grapheme cluster (may be >1 code unit for emoji, combining marks).
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*/
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char: string;
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/**
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* X offset from line start in fontA, pixels.
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*/
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xA: number;
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/**
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* Advance width of this grapheme in fontA, pixels.
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*/
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widthA: number;
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/**
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* X offset from line start in fontB, pixels.
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*/
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xB: number;
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/**
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* Advance width of this grapheme in fontB, pixels.
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*/
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widthB: number;
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}
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/**
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* A single laid-out line. `chars` carries the per-grapheme data needed by
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* computeLineRenderModel. Consumers should not iterate it directly.
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*/
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export interface ComparisonLine {
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/**
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* Full text of this line as returned by pretext.
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*/
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text: string;
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/**
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* Rendered width in pixels — maximum across fontA and fontB.
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*/
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width: number;
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/**
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* Per-grapheme metadata for both fonts.
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*/
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chars: ComparisonChar[];
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}
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/**
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* Aggregated output of a dual-font layout pass.
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*/
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export interface ComparisonResult {
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/**
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* Per-line grapheme data. Empty when input text is empty.
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*/
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lines: ComparisonLine[];
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/**
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* Total height in pixels.
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*/
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totalHeight: number;
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}
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