import { BoundingBoxConfig } from '../types';

/**
 * Full-frame identity bounding box. A box with these values covers the whole viewport,
 * which renders the same as having no box at all.
 */
export declare const DEFAULT_BOUNDING_BOX: BoundingBoxConfig;
/**
 * Merges a user-supplied (possibly partial) bounding box with the full-frame defaults so the
 * renderer always receives a complete BoundingBoxConfig — the GPU path dereferences every
 * dimension (`bbox.x.unit`, …) and would crash on a partial object. Returns undefined when no
 * box is given: absence keeps the bounding-box render path disabled entirely, so a merged
 * default is never forced onto layers that don't use one.
 */
export declare function resolveBoundingBox(bbox?: Partial<BoundingBoxConfig> | null): BoundingBoxConfig | undefined;
/**
 * True when a box covers the whole frame with no rotation or corner rounding — i.e. it renders
 * identically to having no box at all. Such a box is a real cost: the clip mask, the resize-fit
 * UV mapping and (for a Group) a full RTT round-trip + resample are all emitted for an identity
 * transform. `boundingBox={{ origin: 'center' }}` merges to exactly this, so it is a common
 * shape to hit; both the composer and the renderer treat it as "no box".
 *
 * Only `uv` units count as identity. A px box that happens to equal the frame right now would
 * flip in and out of identity on every resize, and crossing that boundary is a recompile.
 *
 * Origin is irrelevant here: with x=0, y=0 and a 1x1 size every origin resolves the box's
 * top-left to (0,0) (`resolveTopLeft` in kit/uvTransform).
 */
export declare function isIdentityBoundingBox(bbox?: Partial<BoundingBoxConfig> | null): boolean;
//# sourceMappingURL=boundingBox.d.ts.map