脚本打包

npm-packages/win32-v2.4.x/canvas/lib/jpegstream.js

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+'use strict'
+
+/*!
+ * Canvas - JPEGStream
+ * Copyright (c) 2010 LearnBoost <tj@learnboost.com>
+ * MIT Licensed
+ */
+
+const { Readable } = require('stream')
+function noop () {}
+
+class JPEGStream extends Readable {
+  constructor (canvas, options) {
+    super()
+
+    if (canvas.streamJPEGSync === undefined) {
+      throw new Error('node-canvas was built without JPEG support.')
+    }
+
+    this.options = options
+    this.canvas = canvas
+  }
+
+  _read () {
+    // For now we're not controlling the c++ code's data emission, so we only
+    // call canvas.streamJPEGSync once and let it emit data at will.
+    this._read = noop
+
+    this.canvas.streamJPEGSync(this.options, (err, chunk) => {
+      if (err) {
+        this.emit('error', err)
+      } else if (chunk) {
+        this.push(chunk)
+      } else {
+        this.push(null)
+      }
+    })
+  }
+};
+
+module.exports = JPEGStream