export interface IGlyphRasterizer {
    /**
     * A unique identifier for the rasterizer.
     */
    readonly id: number;
    /**
     * An identifier for properties inherent to rendering with this rasterizer. This will be the
     * same as other rasterizer cache keys provided they share the same property values in question.
     */
    readonly cacheKey: string;
    /**
     * Rasterizes a glyph.
     * @param chars The character(s) to rasterize. This can be a single character, a ligature, an
     * emoji, etc.
     * @param tokenMetadata The token metadata of the glyph to rasterize. See {@link MetadataConsts}
     * for how this works.
     * @param decorationStyleSetId The id of the decoration style sheet. Zero means no decoration.
     * @param colorMap A theme's color map.
     */
    rasterizeGlyph(chars: string, tokenMetadata: number, decorationStyleSetId: number, colorMap: string[]): Readonly<IRasterizedGlyph>;
    getTextMetrics(text: string): TextMetrics;
}
/**
 * A simple bounding box in a 2D plane.
 */
export interface IBoundingBox {
    /** The left x coordinate (inclusive). */
    left: number;
    /** The top y coordinate (inclusive). */
    top: number;
    /** The right x coordinate (inclusive). */
    right: number;
    /** The bottom y coordinate (inclusive). */
    bottom: number;
}
/**
 * A glyph that has been rasterized to a canvas.
 */
export interface IRasterizedGlyph {
    /**
     * The source canvas the glyph was rasterized to.
     */
    source: OffscreenCanvas;
    /**
     * The bounding box of the glyph within {@link source}.
     */
    boundingBox: IBoundingBox;
    /**
     * The offset to the glyph's origin (where it should be drawn to).
     */
    originOffset: {
        x: number;
        y: number;
    };
    /**
     * The distance from the glyph baseline to the top of the highest bounding rectangle of all
     * fonts used to render the text.
     *
     * @see {@link TextMetrics.fontBoundingBoxAscent}
     */
    fontBoundingBoxAscent: number;
    /**
     * The distance from the glyph baseline to the bottom of the bounding rectangle of all fonts
     * used to render the text.
     *
     * @see {@link TextMetrics.fontBoundingBoxDescent}
     */
    fontBoundingBoxDescent: number;
}