The rfb variable wasn't available at the point settingsDisabled() was
being called since it was called inline with RFB() initialization. To
solve this we pass the updateState rfb variable so that the canvas can
be queried for setting the cursor_uri value.

Apparently the virtualbox VNC server send the size and then the
security type list in separate frames so we need to wait for the full
list.

When the documement/window is scrolled, the onMouseDisable routine was
not properly calculating the position to test whether to ignore the
event or not.

Change RQ and SQ vars to rQ and sQ since caps at the start implies
a classable entity.

This is logical now since the external update callback can be provided
when the object is created so we don't need a separate init function.

It's less efficient on average that base64 (150% vs 133%). It's
non-standard (0 shifted to 256 before encoding). And I rarely use it.

Turned out not to be useful (pretty much never looked at the info once
I added it). The playback test is much more useful for measuring
performance.

getCLength was not using the index (RQi) into the receive queue.

Generally, most servers send hextile updates as single updates
containing many rects. Some servers send hextile updates as many small
framebuffer updates with a few rects each (such as QEMU). This latter
cases revealed that shifting off the beginning of the receive queue
(which happens after each hextile FBU) performs poorly.

This change switches to using an indexed receive queue (instead of
actually shifting off the array). When the receive queue has grown to
a certain size, then it is compacted all at once.

The code is not as clean, but this change results in more than 2X
speedup under Chrome for the pessimal case and 10-20% in firefox.

Apparently there are versions of UltraVNC that report version 3.6.
This is not a legal version according to the spec, but we'll just
force version 3.3 if we receive it. Thanks to Larry Rowe for the info.

Turns out when Windows is running in QEMU and a window scroll happens,
there are lots of little hextile rects sent. This is slow in noVNC.

- Some recording/playback improvement.
- Add test harness to drive playback of recordings.
- By pulling off the rect header in one chunk we get a 3X speedup in
  Chrome and a 20% speedup in firefox (specifically for the scroll
  test).
- Also, get rid of some noise from creating timers for handle_message.
  Check to make sure there isn't already a pending timer first.

(cherry picked from commit 11f3271a52505dccbf38bea422e7c9a79dddd478)
Signed-off-by: Joel Martin <github@martintribe.org>

This is very usefull when you need to open a new window (with a new document) from javascript,
without having to reload the script.js.
(cherry picked from commit 8ded53c1de06d01e50d58543c19e73926f0fbbd4)
Signed-off-by: Joel Martin <github@martintribe.org>

New API:

To use the RFB object, you now must instantiate it (this allows more
than one instance of it on the same page).

    rfb = new RFB(settings);

The 'settings' variable is a namespace that contains initial default
settings. These can also be set and read using 'rfb.set_FOO()' and
'rfb.get_FOO()' where FOO is the setting name. The current settings
are (and defaults) are:
    - target: the DOM Canvas element to use ('VNC_canvas').
    - encrypt: whether to encrypt the connection (false)
    - true_color: true_color or palette (true)
    - b64encode: base64 encode the WebSockets data (true)
    - local_cursor: use local cursor rendering (true if supported)
    - connectTimeout: milliseconds to wait for connect (2000)
    - updateState: callback when RFB state changes (none)
    - clipboardReceive: callback when clipboard data received (none)

The parameters to the updateState callback have also changed. The
function spec is now updateState(rfb, state, oldstate, msg):
    - rfb: the RFB object that this state change is for.
    - state: the new state
    - oldstate: the previous state
    - msg: a message associate with the state (not always set).

The clipboardReceive spec is clipboardReceive(rfb, text):
    - rfb: the RFB object that this text is from.
    - text: the clipboard text received.

Changes:

- The RFB and Canvas namespaces are now more proper objects. Private
  implementation is no longer exposed and the public API has been made
  explicit. Also, instantiation allows more than one VNC connection
  on the same page (to complete this, DefaultControls will also need
  this same refactoring).

- Added 'none' logging level.

- Removed automatic stylesheet selection workaround in util.js and
  move it to defaultcontrols so that it doesn't interfere with
  intergration.

- Also, some major JSLinting.

- Fix input, canvas, and cursor tests to work with new model.

If cursor Data URI scheme detection threw an exception, it would cause
canvas initialization to fail. cursor detection exceptions should just
disable local cursor change support, not cause canvas init to fail.

Uses the CSS "scale()" operation. The main problem is that the DOM
container is not rescaled, only the size of the displayed content
within it so there will need to be some sort of mechanism to handle
this better so other elements reflow to the new size. Or it might just
not work and be removed later. The zoom property seems to do the right
behavior, but it's not widely supported. Worth exploring though.

After each complete framebufferUpdate, set a short timer to continue
processing the receive queue. This gives other events a chance to
fire. Especially important when noVNC is integrated into another
website.

noVNC was never processing more than one framebufferUpdate message per
onmessage event. If noVNC receives an incomplete framebufferUpdate and
then receives the rest of the framebufferUpdate plus another complete
framebufferUpdate, then it will fall permanently behind.

If there is more to process after a completed framebufferUpdate, then
execute normal_msg again.

All the render routines must return false if there is not enough data
in the receive queue to process their current update, and true
otherwise.

Move the whole RFB object to rfb.js. vnc.js is now just the loader
file. This allows an integrating project to easily replace vnc.js with
an alternate loader mechanism (or just do it directly in the html
file). Thanks for the idea primalmotion (http://github.com/primalmotion).

Also, JSLint the various files.

The following API changes may affect integrators:

    - Settings have been moved out of the RFB.connect() call. Each
      setting now has it's own setter function: setEncrypt, setBase64,
      setTrueColor, setCursor.

    - Encrypt and cursor settings now default to on.

    - CSS changes:
        - VNC_status_bar for input buttons switched to a element class.

        - VNC_buttons split into VNC_buttons_right and
          VNC_buttons_left

        - New id styles for VNC_settings_menu and VNC_setting

Note: the encrypt, true_color and cursor, logging setting can all be
  set on load using query string variables (in addition to host, port
  and password).

Client cursor (cursor pseudo-encoding) support has been polished and
activated.

The RFB settings are now presented as radio button list items in
a drop-down "Settings" menu when using the default controls.

Also, in the settings menu is the ability to select between alternate
style-sheets.

Cookie and stylesheet selection support added to util.js.

To change the appearance of the cursor, we use the CSS cursor style
and set the url to a data URI scheme. The image data sent via the
cursor pseudo-encoding has to be encoded to a CUR format file before
being used in the data URI.

During Canvas initialization we try and set a simple cursor to see if
the browser has support. Opera is missing support for data URI scheme
in cursor URLs.

Disabled for now until we have a better way of specifying settings
overall (too many settings for control bar now).

Add new states 'loaded', 'connect' and 'fatal':
- Loaded state is first page state. Pass WebSockets mode message using
  this state.
- Connect indicates that the user has issued a "connect" but we
  haven't gotten an WebSockets onopen yet.
- Fatal is a condition that indicates inability to continue on: right
  now, lack of WebSockets/Flash or non-working canvas.

Move much of the actual state transition code into updateState.

Handle 'password' state better in default_controls.js; instead of
disconnecting, prompt for password to send.

Add comments to updateState indicating possible states.

0 is valid UTF-8, but in order to avoid WebSockets framing, we
encode/decode it as 256.

Also, be tolerant of 0 length messages.

- Change tightpng encoding number to -260 (aliguori provided it until
  an official number can be allocated).

mootools is no longer needed. The bug that the FABridge test was
testing has been resolved in web-socket-js so it's no longer needed.

Util.Debug, Util.Info, Util.Warn, Util.Error routines instead of
direct calls to console.*. Add "logging=XXX" query variable that sets
the logging level (default is "warn").

Logging values:
    debug: code debug logging (many calls in performance path are also
           commented for performance reasons).
    info: informative messages including timing information.
    warn: significant events
    error: something has gone wrong

Also, move bugs from TODO to github issues.

Bug fixes, restore RFC2817 proxy for non wss://, and handle new closing
handshake from WebSockets 76.

The problem is, you can't set WebSocket.__swfLocation before you load
web_socket.js (because it creates the WebSocket global), but you also
can't reliably set WebSocket.__swfLocation after because if you are
doing dynamic script file includes then the onload (i.e.
WebSocket.__initialize) may fire before you have a chance to set
Websocket.__swfLocation.

Bug fixes, restore RFC2817 proxy for non wss://, and handle new
closing handshake from WebSockets 76.