Issue: https://github.com/kanaka/noVNC/issues/118
Reporter @maxnet also found and suggested the fix.

Probably could be more intelligent/generic by keying off the depth
sent by the server, but this will do for now.

Switched to using: http://www.jshint.com/

Also add commented out web-socket-js debug variable in
include/websock.js

Resolve issue: https://github.com/kanaka/noVNC/pull/101

Based on proposal from @mightpenguin:
Matthew Balman <emperor@mightypenguin.org>

If view_only option is set then do not send mouse and keyboard events.
This is not a secure/enforced way to make a client view only. To
enforce view only at the server, most VNC servers support setting
a view only password.

Display API change:
    - getTile -> startTile (no longer returns a tile)
    - setSubTile -> subTile (drop img/tile first parameter)
    - putTile -> finishTile (no longer takes img/tile paramter)

The Display tile logic uses canvas image data directly and
caches/reuses a 16x16 imageData tile (for other sizes, the tile is
create for each call). This gives a 30% speedup on Chrome
13 (and no significant change for Firefox 3.6/4.0).

Other:

- Remove rgbxImageFill and cmapImageFill routines.

- Simplify constructor tests and just error if createImageData is not
  supported by canvas instead of .

- Remove webkit canvas bug workaround that effects Chrome 7. Chrome
  7 usage share is now less than 0.5 percent and the workaround is
  ugly. Drop the function wrapping in the constructor and the canvas
  flush() routine.

- Remove support for getImageData (Opera 11+ now required)

Update browser support list:

    - Chrome 8+ (really any except 7)
    - Firefox 3.6+
    - Safari 4+
    - Opera 11+
    - IE9+
    - iOS 4.2+

API changes (forward compatible):

- Display: add 'viewport' conf option to turn on and off viewport
  mode.
- RFB: add 'viewportDrag' option to enable/disable viewport dragging
  mode.

Other:

- Add clip mode setting to default UI. For touch devices, clipping is
  forced on.
- Use CSS media queries to adjust visual elements based on screen
  size. Especially disconnected logo size/position and button text size.
- Catch page unload while connected and give a confirm dialog.
- Change mouse button selector to a single button that changes between
  ' ', 'L', 'M', 'R' when clicked (empty means mouse is just being
  moved and doesn't send clicks).
- include/ui.js:setViewClip() routine sets the clipping of the
  viewport to the current size of the viewport area (if clipping is
  enabled).
- include/ui.js:setViewDrag() toggles/enables/disables viewport
  dragging mode.
- Add several images for the UI and for Apple devices:
    - images/clipboard.png: clipboard menu icon
    - images/connect.png: connect menu icon
    - images/disconnect.png: disconnect button icon
    - images/keyboard.png: show keyboard button
    - images/move.png: viewport drag/move toggle button
    - images/settings.png: settings menu icon
    - images/screen_320x460.png: iOS app/desktop link start image
    - images/screen_57x57.png: iOS app icon
    - images/screen_700x700.png: full size noVNC image

New routine fbUpdateRequests that builds the update request messages
based on the result of display.getCleanDirtyReset().

- Also, fix fbUpdateRequest to properly accept x,y,xw,yw parameters.

Part of mobile device support:
https://github.com/kanaka/noVNC/issues/48

The Display object is redefined as a larger display region with
an equal or smaller visible viewport. The size of the full display
region is set/changed using resize(). The viewport is set/changed
using viewportChange().

All exposed routines that draw on the display now take coordinates
that are absolute (relative to the full display region). For example,
the result of fillRect(100, 100, 10, 10, [255,0,0]) will appear in the
canvas at (0,0) if the viewport is set to (100,100).

Details:

- Move the generic part of the viewport code from tests/viewport.html
  into include/display.

- Add two new routines to the Display interface:

    - viewportChange(deltaX, deltaY, width, height)
        - This adjusts the position of the visible viewport and/or the
          size of the viewport.

        - deltaX and deltaY specify how the position of the viewport
          should be shifted. The position of the viewport is clamped
          to the full region size (i.e. cannot outside the display
          region).

        - The clean and dirty regions of the display are updated based
          on calls to this routine. For example, if the viewport width
          is increased, then there is now a dirty box on the right
          side of the viewport. Another example, if the viewport is
          shifted down and to the left over the display region, there
          are now two dirty boxes: one on the left side and one
          on the bottom of the viewport.

    - getCleanDirtyReset()
        - This returns an object with the clean box and a list of
          dirty boxes (that need to be redrawn).

            {'cleanBox':
                {'x': x, 'y': y, 'w': w, 'h': h},
             'dirtyBoxes':
                [{'x': x, 'y': y, 'w': w, 'h': h}, ...]
             }

        - The coordinates in the clean and dirty boxes are absolute
          coordinates (relative to the full display region) but they
          are clipped to the visible viewport.

        - Calling this function also resets the clean rectangle to be
          the whole viewport (i.e. nothing visible needs to be redrawn
          dirty) so the caller of this routine is responsible for
          redrawing any

This addresses issue #65:
https://github.com/kanaka/noVNC/issues/65

When tightPNG encoded rects were received, any fill types were
immediately drawn to the canvas while images (PNG, JPEGs) were queued
for loading. This can cause screen corruption when things are changing
rapidly due to the misordering of fills vs images.

Also, remove the onload setting in each image on the queue and instead
decrease the tight image queue scanning interval (to 40ms or 25
scans per second).

For debugging issue #70: https://github.com/kanaka/noVNC/issues/70

This change allows one to implement a single WebSockets proxy, which
multiplexes connections to different hosts.

- Update test mode calls to work with separate websock module.

- Pull in include/websock.js update 7f487fdbd from websockify.

- Add conf_defaults which accepts an array of configuration
  attributes.
- Split out user configuration defaults from the actual configuration
  object.
- Add mode field and enforce read-only, write-once, read-write modes.

API changes:
    - include/canvas.js renamed to include/display.js
    - Display.rescale() method removed from API. Use Display.set_scale() instead.
    - Make logo configuration attribute of Display and display it when
      clear() is called if it is set.

API deprecations:
    - use RFB onUpdateState instead of updateState.
    - use RFB onClipboard instead of clipboardReceive.

See https://github.com/kanaka/noVNC/wiki/ModuleAPI for detailed noVNC
modules and API description.

Expand and normalize the event/callback interfaces. Standize on
"onEventName" form for callbacks.

    Callback Renames:
        - RFB updateState -> onUpdateState
        - RFB clipboardReceive -> onClipboard
        - Keyboard keyPress -> onKeyPress
        - Mouse mouseButton -> onMouseButton
        - Mouse mouseMove -> onMouseMove

    Callback Additions:
        - RFB onPasswordRequired
        - RFB onBell
        - RFB onFBUReceive
        - RFB onFBUComplete

Other:
- Add array type support to Util.conf_default()
- Removed a bunch of routines from the Display API that were just used
  internally and not actually by noVNC: flush, setFillColor,
  imageDataGet, imageDataCreate, rgbxImageData, rgbxImageFill,
  cmapImageData, cmapImageFill.
- More keyboard/mouse logging when debug turned on.
- Some JSLinting

API change: for intergrators that explicitly include the Javascript
files (that do not use include/vnc.js)js, include/input.js is a new
file that must also be included.

The mouse and keyboard handling could be useful on its own so split it
out into a Keyboard and Mouse class in include/input.js.

This refactoring is preparation to deal with issue #21 - non-US
keyboard layouts.

Fix mouse button mapping in IE9. All browsers have converged on
a standard left=0, middle=1, right=2 ... all except IE that is.

Add html5 doctype to tests.

In vnc_perf test, use do_test instead of start for function name since
start is a keyword in IE.

In error about Flash give a link to Adobe's download page.

Current timeout is 2 seconds for connect timeout. Use 5 seconds if
web-socket-js (Flash WebSockets emulator) is being used. On Windows XP
with Flash 10.2.152.26, connecting seems to take quite a bit longer
than it probably should. This should make it work more consistently.

Thanks to Michael Sersen for creating images/Logo.svg.

- Add images directory with original SVG logo, favicon, and some
  derivative PNGs of the logo for different purpose.

- Note that license on images/* is CC BY-SA.

- Add utils/img2js.py to take an image and generate a base64 encoded
  data URI string.

- Add base64 encoded data URI screen logo to display in canvas when
  disconnected.

Copy in include/websock.js from websockify and use that instead. Still
some cleanup of network code but it's a good start.

Issue #39: https://github.com/kanaka/noVNC/issues/issue/39

Issue #39: https://github.com/kanaka/noVNC/issues/issue/39

Rename the $() selector to $D() so that it doesn't collide with
the jQuery name.

The API change is that the 'target' option for Canvas and RFB objects
must now be a DOM Canvas element. A string is no longer accepted
because this requires that a DOM lookup is done and the Canvas and RFB
should have no UI code in them. Modularity.

Only call encode_message when the WebSockets object is actually
ready to send. Otherwise multiple base64 encode sequences can be
encoded into the same WebSockets frame. This causes the C version of
wsproxy to crash and the python version to ignore the subsequent
base64 sequence(s).

Thanks to Colin Dean (xvpsource.org) for finding this and helping
track it down.

- Split out ClientInitialisation state.

- In version 3.3 and 3.7, when the server has no auth (scheme
  1), then we should skip from Authentication to ClientInitialisation.

If shared mode is false, then the server should disconnect other
connections before the current connection is allowed to proceed.

- rQwait checks the receive queue to see if there is enough data to
  satisfy the following request. If not it returns true (which is
  almost always translated into an immediate return false by the
  caller).

- rQwait is called quite a bit and this generally allows 4 lines to
  become 1 line where it is called.

- rQwait allows simplification of cuttext processing. No global
  tracking needed anymore.

Overall, about 60 lines less code.

DES is just used once during authentication and is not performance
sensitive so we save some space by generating and/or removing some
lookup tables. Also, shorten some very frequently used variables.

Shaves off about 100 lines.

The decrypt functionality is never used so remove it. Also, we can
assume that we are always DES encrypting 16 characters which allows
several things to be simplified in DES.

Overall this removes about 80 lines of code.