export declare const PI: number;
export declare const PI_2: number;
export declare function isPow2(v: number): boolean;
export interface ExportTile {
    /** Left offset of the tile in the full image (logical units). */
    x: number;
    /** Top offset of the tile in the full image (logical units). */
    y: number;
    /** Tile width (logical units); clamped at the right edge. */
    width: number;
    /** Tile height (logical units); clamped at the bottom edge. */
    height: number;
}
/**
 * Split a `width × height` image into a grid of tiles no larger than `limit`
 * on either axis. Used to export images that exceed a single GPU render pass
 * (texture / renderbuffer / viewport limits). Tiles are returned row-major and
 * cover the whole image with no overlap; edge tiles are clamped to the
 * remaining size. Returns an empty array for a degenerate (zero-area) image.
 */
export declare function planExportTiles(width: number, height: number, limit: number): ExportTile[];