export interface RenderOptions {
    width: number;
    height: number;
    maintainAspectRatio?: boolean;
    backgroundColor?: number;
}
export interface RenderedPage {
    buffer: any;
    width: number;
    height: number;
    stride: number;
    _bitmap?: any;
}
export declare class PdfRenderService {
    private pdfium;
    private isInitialized;
    private pageCache;
    private cacheEnabled;
    private logger;
    constructor();
    /**
     * Initialize PDFium library (using singleton for performance)
     */
    initialize(): Promise<void>;
    /**
     * Enable or disable page caching
     */
    setCacheEnabled(enabled: boolean): void;
    isCacheEnabled(): boolean;
    /**
     * Cleanup PDFium library (using reference counting for singleton)
     */
    cleanup(): void;
    /**
     * Clear page cache
     */
    clearCache(): void;
    /**
     * Cleanup rendered page bitmap
     */
    cleanupRenderedPage(renderedPage: RenderedPage): void;
    /**
     * Load PDF document from buffer
     */
    loadDocument(pdfData: Buffer): any;
    /**
     * Close PDF document and clear its cache
     */
    closeDocument(pdfDoc: any): void;
    /**
     * Get page count from document
     */
    getPageCount(pdfDoc: any): number;
    /**
     * Get page dimensions in points (1/72 inch)
     */
    getPageDimensions(pdfDoc: any, pageIndex: number): {
        width: number;
        height: number;
    };
    calculateRenderWidth(pdfDoc: any, pageIndex: number, targetWidth: number): {
        width: number;
        height: number;
    };
    /**
     * Render a single PDF page to bitmap with caching
     */
    renderPage(pdfDoc: any, pageIndex: number, options: RenderOptions): RenderedPage;
    getCacheKey(pageIndex: number, width: number, height: number): string;
    /**
     * Pre-render multiple pages in parallel (performance optimization)
     */
    preRenderPages(pdfDoc: any, pageIndices: number[], options: RenderOptions): Promise<void>;
}
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