Function toQuoteMessage

quote/quote.ts:1211–1261

(msg: Api.Message, args: QuoteArgs)

    const canvas = createCanvas(img.width, img.height);
    const ctx = canvas.getContext("2d");
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    ctx.drawImage(img, 0, 0);
    return canvas;
  } catch (_) {
    return undefined;
  }
}

function collectAnimatedEmojiIds(messages: any[]): string[] {
  const ids = new Set<string>();
  const scanEntity = (entity: any) => {
    const id = entity?.custom_emoji_id;
    if (id && animatedCustomEmojiCache.get(String(id))) ids.add(String(id));
  };
  const scanMessage = (message: any) => {
    if (!message) return;
    (message.entities || []).forEach(scanEntity);
    (message.caption_entities || []).forEach(scanEntity);
    // Do not let sender emoji_status alone turn a pure-text quote into animated WebM.
    // It is already rendered from customEmojiCache as a static first frame.
    if (message.replyMessage) scanMessage(message.replyMessage);
    if (message.forward) scanMessage(message.forward);
  };
  messages.forEach(scanMessage);
  return Array.from(ids);
}

function applyCustomEmojiFrame(messages: any[], id: string, frame: Buffer): void {
  const applyEntity = (entity: any) => {
    if (String(entity?.custom_emoji_id || "") === id) entity.customEmojiBuffer = frame;
  };
  const scanMessage = (message: any) => {
    if (!message) return;
    (message.entities || []).forEach(applyEntity);
    (message.caption_entities || []).forEach(applyEntity);
    const statusId = message.from?.emoji_status?.custom_emoji_id || message.from?.emoji_status?.customEmojiId || message.emoji_status?.custom_emoji_id || message.emoji_status?.customEmojiId;
    if (String(statusId || "") === id) {
      if (message.from?.emoji_status) message.from.emoji_status.customEmojiBuffer = frame;
      if (message.emoji_status) message.emoji_status.customEmojiBuffer = frame;
    }
    if (message.replyMessage) scanMessage(message.replyMessage);
    if (message.forward) scanMessage(message.forward);
  };
  messages.forEach(scanMessage);
}

function isWebmBuffer(buffer: Buffer | undefined): boolean {
  return !!buffer && buffer.length >= 4 && buffer.subarray(0, 4).equals(Buffer.from([0x1a, 0x45, 0xdf, 0xa3]));
}

function isGifBuffer(buffer: Buffer | undefined): boolean {
  return !!buffer && buffer.length >= 6 && (buffer.subarray(0, 6).toString("ascii") === "GIF87a" || buffer.subarray(0, 6).toString("ascii") === "GIF89a");
}