refactor(core): CORE-19 type capture and preserve progress lifetimes

packages/artplayer/src/capture/frame.ts

@@ -0,0 +1,28 @@
+export type CaptureMedia = CanvasImageSource & {
+  videoWidth: number
+  videoHeight: number
+  currentTime: number
+}
+
+export function drawFrame(canvas: HTMLCanvasElement, video: CaptureMedia): void {
+  canvas.width = video.videoWidth
+  canvas.height = video.videoHeight
+  const context = canvas.getContext('2d')
+  if (!context)
+    throw new TypeError('Canvas 2D context is unavailable')
+  context.drawImage(video, 0, 0)
+}
+
+export function captureBlobUrl(canvas: HTMLCanvasElement, resolve: (url: string) => void, reject: (error: unknown) => void): void {
+  canvas.toBlob((blob) => {
+    try {
+      if (!blob)
+        throw new Error('Unable to encode screenshot blob')
+      // The public getBlobUrl caller owns this URL, including after destroy.
+      resolve(URL.createObjectURL(blob))
+    }
+    catch (error) {
+      reject(error)
+    }
+  })
+}