/**
 * Preview Renderer
 *
 * Renders ESC/POS commands to preview images.
 * Simulates thermal printer output for preview purposes.
 *
 * @example
 * ```typescript
 * const renderer = new PreviewRenderer();
 * const preview = await renderer.render(commands, { paperWidth: 58 });
 * console.log(preview.base64);
 * ```
 */
/**
 * Preview options
 */
export interface PreviewOptions {
    /** Paper width in mm (default: 58) */
    paperWidth?: number;
    /** DPI (default: 203) */
    dpi?: number;
    /** Background color (default: '#ffffff') */
    backgroundColor?: string;
    /** Foreground color (default: '#000000') */
    foregroundColor?: string;
    /** Font size in pixels (default: 24) */
    fontSize?: number;
    /** Line height multiplier (default: 1.2) */
    lineHeight?: number;
}
/**
 * Preview result
 */
export interface PreviewResult {
    /** Base64 encoded image */
    base64: string;
    /** Image width in pixels */
    width: number;
    /** Image height in pixels */
    height: number;
    /** MIME type */
    mimeType: string;
}
/**
 * Preview renderer interface
 */
export interface IPreviewRenderer {
    render(commands: Uint8Array, options?: PreviewOptions): PreviewResult;
    renderToImageData(commands: Uint8Array, options?: PreviewOptions): ImageData;
}
/**
 * Preview Renderer class
 * Renders ESC/POS commands to preview images
 */
export declare class PreviewRenderer implements IPreviewRenderer {
    private readonly logger;
    /**
     * Render ESC/POS commands to a preview image
     */
    render(commands: Uint8Array, options?: PreviewOptions): PreviewResult;
    /**
     * Render to ImageData (for Canvas rendering)
     */
    renderToImageData(commands: Uint8Array, options?: PreviewOptions): ImageData;
    /**
     * Parse ESC/POS commands into renderable lines
     */
    private parseCommands;
    /**
     * Create text buffer handlers for command parsing
     */
    private createTextBufferHandlers;
    /**
     * Create line management handlers
     */
    private createLineHandlers;
    /**
     * Parse the command stream byte by byte
     */
    private parseCommandStream;
    /**
     * Handle ESC (0x1B) or GS (0x1D) command sequences.
     * @param prefix - ESC or GS prefix byte
     * @returns Number of bytes consumed
     */
    private handleControlSequence;
    /**
     * Handle multi-byte character decoding (GBK/UTF-8).
     * @returns Decoded character and number of bytes consumed
     */
    private handleMultiByte;
    /**
     * Render to canvas and return base64
     */
    private renderToCanvas;
    /**
     * Draw lines to canvas context
     */
    private drawToContext;
    /**
     * Create placeholder result for non-browser environments
     */
    private createPlaceholder;
}
export declare const previewRenderer: PreviewRenderer;