/**
 * Screenshot Utilities
 *
 * Shared canvas and screenshot helper functions used by both
 * GlobalDevBar and SweetlinkBridge for capturing and processing screenshots.
 */
/** Default screenshot scale factor */
export declare const DEFAULT_SCREENSHOT_SCALE = 0.25;
/** Default JPEG quality */
export declare const DEFAULT_SCREENSHOT_QUALITY = 0.7;
/**
 * Options for canvas scaling
 */
export interface ScaleCanvasOptions {
    scale: number;
    smoothing?: boolean;
    smoothingQuality?: ImageSmoothingQuality;
}
/**
 * Scale a canvas down to a smaller size
 *
 * @param originalCanvas - The source canvas to scale
 * @param options - Scaling options
 * @returns A new scaled canvas
 */
export declare function scaleCanvas(originalCanvas: HTMLCanvasElement, options: ScaleCanvasOptions): HTMLCanvasElement;
/**
 * Options for converting canvas to data URL
 */
export interface ToDataUrlOptions {
    format?: 'jpeg' | 'png';
    quality?: number;
}
/**
 * Convert a canvas to a data URL
 *
 * @param canvas - The canvas to convert
 * @param options - Conversion options
 * @returns Data URL string
 */
export declare function canvasToDataUrl(canvas: HTMLCanvasElement, options?: ToDataUrlOptions): string;
/**
 * Extract base64 data from a data URL
 *
 * @param dataUrl - The data URL to extract from
 * @returns Base64 encoded string without the prefix
 */
export declare function extractBase64FromDataUrl(dataUrl: string): string;
/**
 * Get the media type from a data URL
 *
 * @param dataUrl - The data URL to check
 * @returns The media type ('image/png' or 'image/jpeg')
 */
export declare function getMediaTypeFromDataUrl(dataUrl: string): 'image/png' | 'image/jpeg';
export interface PrepareForCaptureOptions {
    /** Temporarily hide devbar UI chrome from the captured image. */
    hideDevbar?: boolean;
}
/**
 * Temporarily hide DevBar chrome for screenshot capture.
 *
 * @returns Cleanup function to restore state
 */
export declare function hideDevbarForCapture(): () => void;
/**
 * Prepare the page for screenshot capture.
 * Blurs active element, adds capturing class to body, and optionally hides DevBar chrome.
 *
 * @returns Cleanup function to restore state
 */
export declare function prepareForCapture(options?: PrepareForCaptureOptions): () => void;
/**
 * Wait for a specified delay (useful for letting UI settle)
 *
 * @param ms - Milliseconds to wait
 */
export declare function delay(ms: number): Promise<void>;
/**
 * Copy a canvas to the clipboard as a PNG image
 *
 * @param canvas - The canvas to copy
 * @returns Promise that resolves when copy is complete
 */
export declare function copyCanvasToClipboard(canvas: HTMLCanvasElement): Promise<void>;
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