/**
 * Lightweight TrueType glyph rasterizer for chart PNG text rendering.
 *
 * Parses the minimal set of TTF tables (cmap, hmtx, loca, glyf, head, hhea,
 * maxp) needed to extract glyph outlines, then rasterizes them via scan-line
 * fill. No dependencies outside this module except `@utils/fs`.
 *
 * Supports:
 * - Simple glyphs (positive numberOfContours)
 * - Composite glyphs (negative numberOfContours, recursive component assembly)
 * - Quadratic B-spline outlines (on-curve / off-curve points, implicit
 *   on-curve midpoints between consecutive off-curve points)
 *
 * Does NOT support: hinting, kerning, OpenType features, vertical layout.
 * This is intentional — the goal is readable chart labels, not DTP.
 */
interface GlyphPoint {
    x: number;
    y: number;
    onCurve: boolean;
}
interface GlyphOutline {
    contours: GlyphPoint[][];
    advanceWidth: number;
}
export interface RasterFont {
    unitsPerEm: number;
    ascent: number;
    descent: number;
    getOutline(codePoint: number): GlyphOutline | undefined;
}
/**
 * Parse a TTF font file into a RasterFont that can render glyphs to pixels.
 */
export declare function parseRasterFont(data: Uint8Array): RasterFont;
/**
 * Rasterize a single glyph into an alpha bitmap with 4x supersampled
 * anti-aliasing for smooth edges.
 *
 * @param outline - Glyph outline from RasterFont.getOutline()
 * @param fontSize - Target font size in pixels
 * @param unitsPerEm - Font's unitsPerEm
 * @returns { width, height, offsetX, offsetY, pixels }
 *   offsetX/offsetY are pixel offsets from the pen position (left of baseline)
 *   to the top-left of the bitmap.  pixels values are 0–255 (coverage).
 */
export declare function rasterizeGlyph(outline: GlyphOutline, fontSize: number, unitsPerEm: number): {
    width: number;
    height: number;
    offsetX: number;
    offsetY: number;
    pixels: Uint8Array;
};
/**
 * Load a system font for text rasterization.
 * Returns null in browser environments or if no font is found.
 * Results are cached — only loads once.
 */
export declare function loadSystemFont(): RasterFont | null;
/** Reset cached font (for testing). */
export declare function resetCachedFont(): void;
export {};