/**
 * Grid rendering benchmark — Canvas 2D vs WebGL spike comparison.
 * @module testing/gridSpikeBenchmark
 */
export interface GridBenchmarkResult {
    backend: "canvas2d" | "webgl";
    dpr: number;
    width: number;
    height: number;
    xTicks: number;
    yTicks: number;
    lineSegments: number;
    avgFrameUs: number;
    p95FrameUs: number;
    frames: number;
}
export interface GridCompareResult {
    canvas2d: GridBenchmarkResult;
    webgl: GridBenchmarkResult | null;
    /** Positive = WebGL faster */
    gainPercent: number;
    recommendation: "implement" | "defer";
}
/** Benchmark Canvas 2D grid via OverlayRenderer.drawGrid */
export declare function benchmarkCanvasGrid(options?: {
    width?: number;
    height?: number;
    dpr?: number;
    xTickCount?: number;
    yTickCount?: number;
    frames?: number;
    showMinor?: boolean;
}): GridBenchmarkResult;
/** Benchmark WebGL grid spike (returns null if WebGL unavailable) */
export declare function benchmarkWebGLGrid(options?: {
    width?: number;
    height?: number;
    dpr?: number;
    xTickCount?: number;
    yTickCount?: number;
    frames?: number;
}): GridBenchmarkResult | null;
/** Compare backends; recommends implement if WebGL ≥20% faster */
export declare function compareGridBackends(options?: {
    dpr?: number;
    frames?: number;
}): GridCompareResult;
/** Vertex builder smoke test (no GL required) */
export declare function countGridVertices(xTickCount: number, yTickCount: number): number;