/**
 * Device pixels per page pixel of a 2D context (#674).
 *
 * `renderPageToCanvas` paints a page of `scale` ≠ 1 by scaling the context,
 * and a turned block, a vertical page or a mirrored one adds its own
 * transform. Text and paths follow the transform on their own; a picture
 * rasterised into an offscreen bitmap (an SVG, a formula) does not: its
 * bitmap must be made at the size it shows at on the device, or the blit
 * resamples it.
 */
/** Device pixels per unit along the context's x and y axes. */
export interface DeviceScale {
    x: number;
    y: number;
}
/**
 * The scale of the context's current transform along each of its axes: the
 * length on the device of one unit of x and of one unit of y, so it holds
 * through a quarter turn and a mirror. 1 on a context without
 * `getTransform` (and for a degenerate transform).
 */
export declare function deviceScaleOf(ctx: CanvasRenderingContext2D | OffscreenCanvasRenderingContext2D): DeviceScale;
/**
 * The factor a vector picture's bitmap is enlarged by over its size in page
 * pixels: the context's scale above 1, and 1 at or below it. A page drawn
 * smaller than its own resolution keeps the bitmap of its page pixels, so
 * a host that repaints at several reductions (the Sandbox follows the
 * window) rasterises each picture once.
 */
export declare function rasterScaleOf(ctx: CanvasRenderingContext2D | OffscreenCanvasRenderingContext2D): DeviceScale;
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