import type { ColumnDataMap } from "../../data/view-reader";
import type { WebGLContextManager } from "../../webgl/context-manager";
import { TreeChartBase } from "../common/tree-chart";
import { type BreadcrumbRegion } from "./treemap-layout";
export interface TreemapLocations {
    u_resolution: WebGLUniformLocation | null;
    a_position: number;
    a_color: number;
}
/**
 * Treemap chart. Shares tree storage + streaming-pipeline + color-mode
 * state with `TreeChartBase`; adds rectangular layout + WebGL quad
 * rendering + drill / tooltip interactions.
 */
export declare class TreemapChart extends TreeChartBase {
    _program: WebGLProgram | null;
    _locations: TreemapLocations | null;
    _positionBuffer: WebGLBuffer | null;
    _colorBuffer: WebGLBuffer | null;
    _vertexCount: number;
    _hoveredNodeId: number;
    _pinnedNodeId: number;
    _breadcrumbRegions: BreadcrumbRegion[];
    _chromeCache: ImageBitmap | null;
    _chromeCacheDirty: boolean;
    /**
     * Monotonic generation counter bumped every time the static chrome
     * content changes (a new `drawStaticChrome` call). The async
     * `createImageBitmap` callback captures the current gen at kickoff
     * and only installs the resulting bitmap if its gen is still the
     * most-recent one. Without this, out-of-order bitmap resolutions
     * can store a stale bitmap in `_chromeCache` — any subsequent
     * hover-only overlay call then blits that stale snapshot over the
     * fresh chart, producing "leftover labels / cells" artefacts.
     */
    _chromeCacheGen: number;
    /**
     * Per-facet drill roots in split_by mode. Key is the facet label
     * (the top-level child of `_rootId`); value is the currently drilled
     * node inside that facet's subtree. Missing keys mean the facet
     * shows its full subtree.
     */
    _facetDrillRoots: Map<string, number>;
    _facetGrid: import("../../layout/facet-grid").FacetGrid | null;
    /** When `false`, branch nodes at relDepth=1 render as a centered
     *  overlay (same style as relDepth=2) and no top-of-rect label
     *  reservation is made in `squarify`. Default `true` preserves the
     *  legacy title-bar look. */
    _showBranchHeader: boolean;
    /**
     * Parallel to `_visibleNodeIds`. Each entry stores the depth of the
     * drill root that owns the corresponding visible node, so render
     * paths can compute `relDepth` uniformly without knowing whether
     * faceting is active. Populated in `renderTreemapFrame` during
     * layout.
     */
    _visibleBaseDepths: Int32Array | null;
    /**
     * Parallel to `_visibleNodeIds`. The drill-root node id that owns
     * each visible node (= `_currentRootId` in non-facet mode, per-
     * facet drill root in facet mode). Used by hit-testing and chrome
     * to skip the drill-root itself without a separate equality check.
     */
    _visibleRootIds: Int32Array | null;
    protected tooltipCallbacks(): {
        onHover: (mx: number, my: number) => void;
        onLeave: () => void;
        onClickPre: (mx: number, my: number) => boolean;
        onDblClick: (mx: number, my: number) => void;
    };
    uploadAndRender(glManager: WebGLContextManager, columns: ColumnDataMap, startRow: number, _endRow: number): Promise<void>;
    _fullRender(glManager: WebGLContextManager): void;
    protected destroyInternal(): void;
}