import { HostBackend } from "./backend.js";

//#region src/canvas.d.ts
/** The subset of `CanvasRenderingContext2D` the painter uses (so a WebGPU/mock backend can satisfy it). */
interface Scene2DContext {
  fillStyle: string;
  strokeStyle: string;
  lineWidth: number;
  globalAlpha: number;
  font: string;
  textBaseline: string;
  save(): void;
  restore(): void;
  clearRect(x: number, y: number, w: number, h: number): void;
  fillRect(x: number, y: number, w: number, h: number): void;
  strokeRect(x: number, y: number, w: number, h: number): void;
  beginPath(): void;
  moveTo(x: number, y: number): void;
  lineTo(x: number, y: number): void;
  arc(x: number, y: number, r: number, start: number, end: number): void;
  closePath(): void;
  fill(): void;
  stroke(): void;
  fillText(text: string, x: number, y: number): void;
}
/** A node in the canvas scene graph. */
interface SceneNode {
  type: string;
  readonly props: Record<string, unknown>;
  text: string;
  readonly isTextNode: boolean;
  parent: SceneNode | null;
  readonly children: SceneNode[];
}
/** A Canvas2D backend: the reconciler builds the scene; `paint(ctx)` rasterizes it. */
interface Canvas2DBackend extends HostBackend<SceneNode> {
  /** The scene root (pass to `render(tree, backend, root)`). */
  readonly root: SceneNode;
  /** Rasterize the whole scene to `ctx` (clears `[0,0,width,height]` first). */
  paint(ctx: Scene2DContext, width: number, height: number): void;
}
/**
 * Create a Canvas2D scene backend. Drive it with the reconciler
 * (`render(scene, backend, backend.root)`), then call `backend.paint(ctx, w, h)` to rasterize — on a
 * frame loop for animations, or once for static art. `onDirty` fires after any mutation so a host can
 * schedule a repaint.
 */
/** Options for {@link createCanvas2DBackend}. */
interface Canvas2DBackendOptions {
  /** Called after any scene mutation so a host can schedule a repaint of the 2D context. */
  readonly onDirty?: () => void;
}
declare function createCanvas2DBackend(options?: Canvas2DBackendOptions): Canvas2DBackend;
//#endregion
export { Canvas2DBackend, Canvas2DBackendOptions, Scene2DContext, SceneNode, createCanvas2DBackend };
//# sourceMappingURL=canvas.d.ts.map