RemoteDesktop: use asm decoder, remove dependencies on libjpg, improvement rendering perf

RemoteDesktop/javascript/decoder_asm.js

@@ -0,0 +1,52 @@
+// Generated by CoffeeScript 1.12.8
+  var api, onmessage, resolution, wasm_update;
+
+  importScripts('wvnc_asm.js');
+
+  api = {};
+
+  resolution = void 0;
+
+  Module.onRuntimeInitialized = function() {
+    return api = {
+      createBuffer: Module.cwrap('create_buffer', 'number', ['number', 'number']),
+      destroyBuffer: Module.cwrap('destroy_buffer', '', ['number']),
+      updateBuffer: Module.cwrap("update", 'number', ['number', 'number', 'number', 'number', 'number', 'number']),
+      decodeBuffer: Module.cwrap("decode", 'number', ['number', 'number', 'number', 'number'])
+    };
+  };
+
+  wasm_update = function(msg) {
+    var datain, dataout, flag, h, p, po, size, tmp, w, x, y;
+    datain = new Uint8Array(msg);
+    x = datain[1] | (datain[2] << 8);
+    y = datain[3] | (datain[4] << 8);
+    w = datain[5] | (datain[6] << 8);
+    h = datain[7] | (datain[8] << 8);
+    flag = datain[9];
+    p = api.createBuffer(datain.length);
+    Module.HEAP8.set(datain, p);
+    size = w * h * 4;
+    po = api.decodeBuffer(p, datain.length, size);
+    dataout = new Uint8Array(Module.HEAP8.buffer, po, size);
+    msg = {};
+    tmp = new Uint8Array(size);
+    tmp.set(dataout, 0);
+    msg.pixels = tmp.buffer;
+    msg.x = x;
+    msg.y = y;
+    msg.w = w;
+    msg.h = h;
+    postMessage(msg, [msg.pixels]);
+    api.destroyBuffer(po);
+    return api.destroyBuffer(p);
+  };
+
+  onmessage = function(e) {
+    if (e.data.depth) {
+      return resolution = e.data;
+    } else {
+      return wasm_update(e.data);
+    }
+  };
+