/**
 * Synthetic Font Effects
 *
 * Provides transformations for creating synthetic bold, italic, and other effects
 * on glyph outlines. These are useful for fonts that don't have native bold/italic
 * variants.
 */
import type { GlyphPath } from "../render/path.ts";
/**
 * Apply oblique (slant/italic) transformation to a path
 *
 * @param path - The glyph path to transform
 * @param slant - Tangent of the slant angle (0.2 = ~12 degrees, typical italic)
 * @returns New path with slant applied
 *
 * Transform: x' = x + y * slant, y' = y
 */
export declare function obliquePath(path: GlyphPath, slant: number): GlyphPath;
/**
 * Apply general 2D affine transformation to a path
 *
 * @param path - The glyph path to transform
 * @param matrix - 2D transformation matrix [a, b, c, d, e, f]
 * @returns New path with transformation applied
 *
 * Transform: x' = a*x + c*y + e, y' = b*x + d*y + f
 */
export declare function transformPath(path: GlyphPath, matrix: [number, number, number, number, number, number]): GlyphPath;
/**
 * Apply horizontal scaling (condensing/expanding) to a path
 *
 * @param path - The glyph path to transform
 * @param factor - Horizontal scale factor (< 1 = narrower, > 1 = wider)
 * @returns New path with horizontal scaling applied
 *
 * Transform: x' = x * factor, y' = y
 */
export declare function condensePath(path: GlyphPath, factor: number): GlyphPath;
/**
 * Embolden (make bolder) a path by offsetting the outline
 *
 * This implementation uses a simplified approach that offsets each contour
 * outward by moving points along the normal direction. For production use,
 * a proper stroking algorithm would be more accurate.
 *
 * @param path - The glyph path to embolden
 * @param strength - Offset strength in font units (positive = bolder, negative = thinner)
 * @returns New path with emboldening applied
 */
export declare function emboldenPath(path: GlyphPath, strength: number): GlyphPath;