利用ImageDecoder API实现GIF图片暂停播放

function pauseGif(imageElement) {
  const imageData = getImageData(imageElement);
  const frames = decodeGifFrames(imageData);
  let currentFrameIndex = 0;
  let intervalId;
  function renderFrame() {
    imageElement.src = frames[currentFrameIndex].dataUri;
    currentFrameIndex++;
    if (currentFrameIndex >= frames.length) {
      currentFrameIndex = 0;
    }
  }
  function startAnimation() {
    intervalId = setInterval(renderFrame, 100);
  }
  function stopAnimation() {
    clearInterval(intervalId);
  }
  imageElement.addEventListener('mouseover', stopAnimation);
  imageElement.addEventListener('mouseout', startAnimation);
  startAnimation();
}
function getImageData(imageElement) {
  const canvas = document.createElement('canvas');
  canvas.width = imageElement.naturalWidth;
  canvas.height = imageElement.naturalHeight;
  const context = canvas.getContext('2d');
  context.drawImage(imageElement, 0, 0);
  return context.getImageData(0, 0, canvas.width, canvas.height);
}
function decodeGifFrames(imageData) {
  const decoder = new ImageDecoder(imageData);
  const frames = [];
  while (true) {
    const { done, value } = decoder.decodeAndAdvance();
    if (done) {
      break;
    }
    frames.push({
      dataUri: `data:image/gif;base64,${btoa(value.data)}`,
      delay: value.delay
    });
  }
  return frames;
}