/**
 * UV Seam Clipping
 *
 * Handles UV seam detection and clipping during painting.
 * Prevents painting across seams and ensures brush strokes stay within face boundaries.
 *
 * Implements Blockbench's exact seam handling:
 * 1. Paint only the UV island you hit
 * 2. Clip brush to UV triangle boundaries
 * 3. Handle overlapping UVs (mirrored textures)
 * 4. Support connected painting mode
 * 5. UV editor painting ignores seams
 */
import { MeshFace } from '../geometry/mesh_face';
import { CubeFace } from '../geometry/cube_face';
/**
 * Check if a pixel is inside a face's UV triangle
 *
 * For cubes: Check if pixel is inside UV rectangle
 * For meshes: Check if pixel is inside UV triangle using barycentric coordinates
 */
export declare function isPixelInFaceUVBounds(pixelX: number, pixelY: number, face: MeshFace | CubeFace, element: any, textureWidth: number, textureHeight: number): boolean;
/**
 * Get all faces that share the same UV pixel
 *
 * Used for handling overlapping UVs (mirrored textures)
 * If two islands share the same texture pixels, both get painted
 */
export declare function getFacesSharingUVPixel(pixelX: number, pixelY: number, element: any, textureWidth: number, textureHeight: number): Array<{
    face: MeshFace | CubeFace;
    faceKey: string | number;
}>;
/**
 * Check if two faces are in the same UV island
 *
 * Used for connected painting mode
 */
export declare function areFacesInSameUVIsland(face1: MeshFace | CubeFace, face2: MeshFace | CubeFace, element: any): boolean;
/**
 * Painting options for seam handling
 */
export interface SeamPaintingOptions {
    /**
     * Paint only the hit island (default: true)
     * If false, paint across seams (connected painting mode)
     */
    clipToIsland?: boolean;
    /**
     * Paint overlapping UVs (mirrored textures)
     * If true, paint all faces that share the same UV pixel
     */
    paintOverlappingUVs?: boolean;
    /**
     * Ignore seams (UV editor mode)
     * If true, paint anywhere on texture regardless of seams
     */
    ignoreSeams?: boolean;
}
/**
 * Check if a pixel should be painted based on seam handling rules
 */
export declare function shouldPaintPixel(pixelX: number, pixelY: number, hitFace: MeshFace | CubeFace, hitElement: any, textureWidth: number, textureHeight: number, options?: SeamPaintingOptions): boolean;
//# sourceMappingURL=uv_seam_clipping.d.ts.map