/**
 * Converts input styles to PDF rendering parameters.
 *
 * Maps font, color, border, fill, and alignment properties
 * to their PDF equivalents for the layout engine and page renderer.
 *
 * This module is fully independent of the Excel module — it works with
 * the PDF module's own style interfaces (PdfFontStyle, PdfFillData, etc.).
 */
import type { PdfColor, LayoutBorders, PdfColorData, PdfFontStyle, PdfFillData, PdfBordersData, PdfAlignmentData } from "../types.js";
/**
 * Convert an ARGB color string to PDF RGB color.
 * Handles "AARRGGBB" (8-char) and "RRGGBB" (6-char) formats.
 * PDF uses 0-1 floats for each component.
 */
export declare function argbToPdfColor(argb: string | undefined): PdfColor | null;
/**
 * Convert a color data object to PDF color.
 * Handles ARGB, theme-based, and indexed colors.
 */
export declare function excelColorToPdf(color: Partial<PdfColorData> | undefined): PdfColor | null;
/**
 * Apply a tint value to a color.
 * Tint range: -1.0 (fully dark) to +1.0 (fully light).
 * Negative tint darkens, positive tint lightens.
 *
 * @see OOXML §18.8.19 - tint formula
 */
export declare function applyTint(color: PdfColor, tint: number): PdfColor;
/**
 * Default colors used in PDF rendering.
 */
export declare const DEFAULT_COLORS: {
    black: PdfColor;
    white: PdfColor;
    gridLine: PdfColor;
};
/**
 * Extract font properties for PDF rendering.
 */
export declare function extractFontProperties(font: Partial<PdfFontStyle> | undefined, defaultFamily: string, defaultSize: number): {
    fontFamily: string;
    fontSize: number;
    bold: boolean;
    italic: boolean;
    strike: boolean;
    underline: boolean;
    textColor: PdfColor;
};
/**
 * Convert a fill to a PDF background color.
 * Only pattern fills with "solid" pattern are supported as PDF backgrounds.
 * Other patterns are approximated or ignored.
 */
export declare function excelFillToPdfColor(fill: PdfFillData | undefined): PdfColor | null;
/**
 * Map border styles to PDF line widths (in points).
 *
 * Values match Excel's actual border weights as used historically by this
 * library (pre-#154). PR #154 doubled every width (0.25 → 0.5, 0.5 → 1,
 * 1 → 2) to make `thin` and `medium` more visually distinct in PDF
 * viewers, but that change made all borders heavier than Excel itself
 * (issue #164). The 2× ratio between thin/medium and the 4× ratio between
 * thin/thick are preserved with the lighter values, so styles remain
 * distinguishable while matching Excel.
 *
 *   hair   = 0.1 pt
 *   thin   = 0.25 pt   (also dotted, dashed, dashDot, dashDotDot, slantDashDot, double)
 *   medium = 0.5 pt    (also mediumDashed, mediumDashDot, mediumDashDotDot)
 *   thick  = 1   pt
 */
export declare function borderStyleToLineWidth(style: string): number;
/**
 * Convert border data to PDF LayoutBorders.
 */
export declare function excelBordersToPdf(borders: Partial<PdfBordersData> | undefined): LayoutBorders;
/**
 * Convert horizontal alignment to PDF alignment.
 */
export declare function excelHAlignToPdf(alignment: Partial<PdfAlignmentData> | undefined): "left" | "center" | "right";
/**
 * Convert vertical alignment to PDF alignment.
 */
export declare function excelVAlignToPdf(alignment: Partial<PdfAlignmentData> | undefined): "top" | "middle" | "bottom";