/**
 * Bounded Traditional Office / WPS worksheet-picture transforms.
 *
 * Admit only quadrant rotations (0/90/180/270) and boolean flips so XLSX
 * round trips stay editable instead of silently dropping geometry.
 */
export interface WorkSpreadsheetImageTransform {
    /** Degrees clockwise; only 0, 90, 180, and 270 are editable. */
    rotation: number;
    flipHorizontal: boolean;
    flipVertical: boolean;
}
export declare function normalizeSpreadsheetImageTransform(transform: WorkSpreadsheetImageTransform): WorkSpreadsheetImageTransform;
export declare function isIdentitySpreadsheetImageTransform(transform: WorkSpreadsheetImageTransform | null | undefined): boolean;
export interface XlsxImageTransformReadResult {
    transform: WorkSpreadsheetImageTransform | null;
    /** False when rotation is present but not a supported quadrant. */
    supported: boolean;
}
export declare function readXlsxImageTransform(xfrm: Element | null | undefined): XlsxImageTransformReadResult;
export declare function xlsxImageTransformAttributes(transform: WorkSpreadsheetImageTransform | null | undefined): string;