import type { Canvas, Image, Picture } from '../canvas';
import { Matrix, Rect } from '../math';
import { Surface } from '../surface';
export type RasterCacheKey = string;
export type RasterCacheEntry = {
    key: RasterCacheKey;
    usedThisFrame: boolean;
    accessCount: number;
    failed: boolean;
    result?: RasterCacheResult;
};
export declare class RasterCacheResult {
    private readonly image;
    private readonly paintBounds;
    readonly surface?: Surface | undefined;
    constructor(image: Image, paintBounds: Rect, surface?: Surface | undefined);
    /**
     * 将缓存的内容绘制到 Canvas 上，如果绘制成功返回 true，否则返回 false
     *
     * todo(haocong): 增加 canvas.getTransform 方法，避免传递 matrix
     */
    draw(canvas: Canvas, matrix: Matrix): void;
}
export declare class RasterCache {
    static readonly DEFAULT_ACCESS_THRESHOLD = 3;
    static readonly DEFAULT_PICTURE_CACHE_LIMIT_PER_FRAME = 1;
    /**
     * 缓存的大小，默认值是 5 分之一 4K 分辨率
     *
     * 例如，如长边为 8192px，短边最大可以是 101
     */
    static readonly DEFAULT_PICTURE_CACHE_AREA: number;
    /**
     * 缓存的最大边长
     */
    static readonly DEFAULT_PICTURE_CACHE_LONG_SIDE = 8192;
    static readonly DEFAULT_SURFACE_POOL_CAPACITY = 4;
    /**
     * 当 Picture 的 drawOps 超过该数值时，视为复杂的 Picture，可以被缓存，否则不会被缓存
     */
    static readonly COMPLEX_PICTURE = 5;
    private static readonly surfacePool;
    protected entries: Map<string, RasterCacheEntry>;
    private accessThreshold;
    private pictureCacheLimitPerFrame;
    private pictureCachedThisFrame;
    protected onDeleteEntry(entry: RasterCacheEntry): void;
    prepareBeforeFrame(): void;
    sweepAfterFrame(): void;
    private getOrCreateRasterCacheEntry;
    private getRasterCacheEntry;
    prepare(picture: Picture, matrix: Matrix, willChange: boolean): boolean;
    protected updateCacheResult(entry: RasterCacheEntry, picture: Picture, matrix: Matrix): void;
    static rasterizePicture(picture: Picture, matrix: Matrix): RasterCacheResult | undefined;
    drawPicture(picture: Picture, canvas: Canvas, matrix: Matrix): boolean;
    static getCacheBounds(bounds: Rect, matrix: Matrix): Rect;
    static getCacheKey(picture: Picture, matrix: Matrix): RasterCacheKey;
}