export interface BoundedCanvasAllocationInput{readonly cssWidth:unknown;readonly cssHeight:unknown;readonly desiredScale:unknown;readonly maxDimension:number;readonly maxPixels:number;}export interface BoundedCanvasAllocation{readonly cssWidth:number;readonly cssHeight:number;readonly pixelWidth:number;readonly pixelHeight:number;
/** Uniform requested scale after applying the dimension and pixel-area limits. */
readonly scale:number;
/** Exact horizontal backing-store scale after integer pixel rounding. */
readonly scaleX:number;
/** Exact vertical backing-store scale after integer pixel rounding. */
readonly scaleY:number;}
/**
* Resolves a bounded canvas backing-store allocation without allocating a canvas.
*
* The requested scale is reduced uniformly so neither backing dimension nor total pixel count can
* exceed the supplied limits. Integer rounding can make the two effective axis scales differ
* slightly, so callers receive both exact values for `CanvasRenderingContext2D.scale()`.
*/
export declare function resolveBoundedCanvasAllocation(input:Readonly<BoundedCanvasAllocationInput>):Readonly<BoundedCanvasAllocation>;
/** A memoized, detached canvas 2D context shared by any component that needs
*  offscreen canvas measurement/normalization (e.g. measuring rendered text
*  width for layout, or normalizing a CSS color string) without allocating
*  its own canvas per call. Created lazily on first use and cached per
*  `Document`, so an element adopted into another browsing context never
*  keeps parsing colors or measuring text through its former realm. Returns
*  `null` when there is no document or canvas 2D isn't available. */
export declare function getScratchCtx(ownerDocument?:Document|null):CanvasRenderingContext2D|null;