/**
 * frame — the central data model: Cell, CellStyle and Frame (a 2D grid).
 * It is the TARGET of the diff. Written without I/O.
 *
 * Parallel buffers plus style string interning (ADR-0005), and lazy per-line
 * hashes with dirty flags (ADR-0001).
 */
import { Attr } from '../ansi/index.js';
export interface Size {
    readonly cols: number;
    readonly rows: number;
}
export interface Point {
    readonly x: number;
    readonly y: number;
}
export interface Rect {
    readonly x: number;
    readonly y: number;
    readonly w: number;
    readonly h: number;
}
export type ColorRef = string;
export interface CellStyle {
    readonly fg?: ColorRef;
    readonly bg?: ColorRef;
    readonly attrs: Attr;
}
export interface Cell {
    readonly char: string;
    readonly width: 0 | 1 | 2;
    readonly style: CellStyle;
}
export declare const DEFAULT_STYLE: CellStyle;
export declare const BLANK_CELL: Cell;
export interface Frame {
    readonly size: Size;
    cellAt(x: number, y: number): Cell;
    rowSlice(y: number): readonly Cell[];
    rowHash(y: number): number;
    set(x: number, y: number, cell: Cell): void;
    putText(x: number, y: number, text: string, style: CellStyle, clip: Rect): number;
    fillRect(rect: Rect, cell: Cell): void;
    invalidate(): void;
    clearTo(style: CellStyle): void;
}
export declare function createFrame(size: Size): Frame;
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