完善虚拟机连接

VM/novnc/core/decoders/tightpng.js

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+/*
+ * noVNC: HTML5 VNC client
+ * Copyright (C) 2019 The noVNC Authors
+ * Licensed under MPL 2.0 (see LICENSE.txt)
+ *
+ * See README.md for usage and integration instructions.
+ *
+ */
+
+import TightDecoder from './tight.js';
+
+export default class TightPNGDecoder extends TightDecoder {
+    _pngRect(x, y, width, height, sock, display, depth) {
+        let data = this._readData(sock);
+        if (data === null) {
+            return false;
+        }
+
+        display.imageRect(x, y, width, height, "image/png", data);
+
+        return true;
+    }
+
+    _basicRect(ctl, x, y, width, height, sock, display, depth) {
+        throw new Error("BasicCompression received in TightPNG rect");
+    }
+}