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import type { CanvasRenderer } from "../canvas-renderer";
import { BaseNode } from "./base-node";
const IMAGE_EPSILON = 1 / 1000;
export interface ImageNodeParams {
url: string;
duration: number;
timeOffset: number;
trimStart: number;
trimEnd: number;
x?: number;
y?: number;
width?: number;
height?: number;
opacity?: number;
}
export class ImageNode extends BaseNode<ImageNodeParams> {
private image?: HTMLImageElement;
private readyPromise: Promise<void>;
constructor(params: ImageNodeParams) {
super(params);
this.readyPromise = this.load();
}
private async load() {
const image = new Image();
this.image = image;
await new Promise<void>((resolve, reject) => {
image.onload = () => resolve();
image.onerror = () => reject(new Error("Image load failed"));
image.src = this.params.url;
});
}
private getImageTime(time: number) {
return time - this.params.timeOffset + this.params.trimStart;
}
private isInRange(time: number) {
const imageTime = this.getImageTime(time);
return (
imageTime >= this.params.trimStart - IMAGE_EPSILON &&
imageTime < this.params.trimStart + this.params.duration
);
}
async render({ renderer, time }: { renderer: CanvasRenderer; time: number }) {
await super.render({ renderer, time });
if (!this.isInRange(time)) {
return;
}
await this.readyPromise;
if (!this.image) {
return;
}
renderer.context.save();
if (this.params.opacity !== undefined) {
renderer.context.globalAlpha = this.params.opacity;
}
if (
this.params.x !== undefined &&
this.params.y !== undefined &&
this.params.width !== undefined &&
this.params.height !== undefined
) {
renderer.context.drawImage(
this.image,
this.params.x,
this.params.y,
this.params.width,
this.params.height,
);
} else {
const mediaW = this.image.naturalWidth || renderer.width;
const mediaH = this.image.naturalHeight || renderer.height;
const containScale = Math.min(
renderer.width / mediaW,
renderer.height / mediaH,
);
const drawW = mediaW * containScale;
const drawH = mediaH * containScale;
const drawX = (renderer.width - drawW) / 2;
const drawY = (renderer.height - drawH) / 2;
renderer.context.drawImage(this.image, drawX, drawY, drawW, drawH);
}
renderer.context.restore();
}
}
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