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import type { CanvasRenderer } from "../canvas-renderer";
import { resolveStickerId } from "@/lib/stickers";
import { VisualNode, type VisualNodeParams } from "./visual-node";
export interface StickerNodeParams extends VisualNodeParams {
stickerId: string;
intrinsicWidth?: number;
intrinsicHeight?: number;
}
interface CachedStickerSource {
source: HTMLImageElement;
width: number;
height: number;
}
const stickerSourceCache = new Map<string, Promise<CachedStickerSource>>();
function loadStickerSource({ stickerId }: { stickerId: string }): Promise<CachedStickerSource> {
const cached = stickerSourceCache.get(stickerId);
if (cached) return cached;
const promise = (async (): Promise<CachedStickerSource> => {
const url = resolveStickerId({
stickerId,
options: { width: 200, height: 200 },
});
const image = new Image();
await new Promise<void>((resolve, reject) => {
image.onload = () => resolve();
image.onerror = () =>
reject(new Error(`Failed to load sticker: ${stickerId}`));
image.src = url;
});
return { source: image, width: image.naturalWidth, height: image.naturalHeight };
})();
stickerSourceCache.set(stickerId, promise);
return promise;
}
export class StickerNode extends VisualNode<StickerNodeParams> {
private cachedSource: Promise<CachedStickerSource>;
constructor(params: StickerNodeParams) {
super(params);
this.cachedSource = loadStickerSource({ stickerId: params.stickerId });
}
async render({ renderer, time }: { renderer: CanvasRenderer; time: number }) {
await super.render({ renderer, time });
if (!this.isInRange({ time })) {
return;
}
const { source, width: loadedWidth, height: loadedHeight } =
await this.cachedSource;
// Prefer element-stored intrinsic dimensions as the geometry authority.
// The loaded image is only the drawable source.
const sourceWidth = this.params.intrinsicWidth ?? loadedWidth;
const sourceHeight = this.params.intrinsicHeight ?? loadedHeight;
this.renderVisual({
renderer,
source,
sourceWidth,
sourceHeight,
timelineTime: time,
});
}
}
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