[dojo-contributors] Silverlight testers needed

Tom Trenka ttrenka at gmail.com
Sat Sep 6 12:46:04 EDT 2008

Just tested my font stuff, IE6/WinXP Core2Duo box, Silverlight.  All work
better under Silverlight--although your observation about
test_vectortext_load is very true.  The only two things I can see there that
are different from everything else is the following:

1) I was resizing the surface after rendering every glyph in the font
2) I am rendering each glyph manually (i.e. not via <font>.draw())

The scaling factor might be an issue as well, although it would seem the
comic book test didn't have a real problem (though still slower than both
Safari and FF).

I have a feeling that part of the issue is not deferring rendering commands
across plug-in boundaries, though I can't be sure.  If that's the case, I
also have a feeling that I'm going to run into the same issues once I get
back to the Flash-based renderer.

I know this would require a major refactor but have you given any thought to
the idea of deferring rendering at all?  Something to the effect of:

//  drawing code here

...or some other set of names.  The idea here would be similar to SVG's
suspend/resume; you could push a set of commands into a queue and force the
drawing all at once.  Nice thing about this idea is that it could be non-API
changing (i.e. current commands would render at once if these are not used)
but again it's a major refactor.

Just a thought.


On Sat, Sep 6, 2008 at 2:19 AM, Eugene Lazutkin <eugene at lazutkin.com> wrote:
> Hash: SHA1
> For Dojo 1.2 the Silverlight renderer was considerably improved.
> Following the latest Microsoft advise it doesn't use any 3rd party
> JavaScript files, and can be turned on by selecting a proper renderer.
> How to select a renderer? There is a special parameter in djConfig:
> gfxRenderer. It should be a string, which lists renderer names separated
> by commas in the order they should be tried by the gfx prologue. The
> current default is: "svg,vml,silverlight,canvas". It means that on all
> major browsers (except IE ans Safari on iPhone/iPad) SVG will be
> selected, VML will be used on IE, and Canvas will be used on iPhone/iPod.
> I plan to change the default to: "svg,silverlight,vml,canvas" after we
> ship 1.2. In practice it means, that SVG is still the preferred renderer
> for non-IE browsers, but Silverlight will be probed on IE and selected,
> if it is available, using VML as a fallback option.
> Why? Silverlight is much faster than VML and it is a much more accurate
> renderer meaning it produces pictures that are much closer to SVG
> visually than VML's ones. For example it allows to use the alpha channel
> in gradients, and it supports proper radial gradients. Of course it has
> some restrictions too that are mostly different from VML. You can read
> all gory details in our docs: http://docs.dojocampus.org/dojox/gfx
> But in order to make the change (planned for releases after 1.2) we need
> to test Silverlight renderer. How to do it? Use following string to
> include Dojo and you'll get it automatically on IE:
> <script type="text/javascript" src="../../../dojo/dojo.js"
> djConfig="isDebug: true, gfxRenderer: 'svg,silverlight,vml,canvas'">
> </script>
> Test it when Silverlight is present and when it is not (to see that the
> fallback works as expected). Get it here: http://silverlight.net/. Don't
> use Moonlight because it still has problems with the browser integration.
> How do I know if gfx uses Silverlight? Two ways to ensure that:
> 1) It says so in the Firebug Lite console: "gfx renderer = silverlight".
> Of course you can see it only if you enabled debugging.
> 2) Right-click on the picture (the surface) and you will see a totally
> different menu, which comes from Silverlight.
> Happy testing! We count on your help. If something is out of ordinary,
> and nobody filed a bug for it --- please file it. You can see the list
> of open bugs here:
> Thank you in advance,
> Eugene
> PS: It is possible to use Silverlight with Firefox on Windows, and with
> Safari on Mac, and even with Firefox on Linux, but why? These browsers
> have excellent SVG renderers. I don't expect you to test Silverlight on
> these platforms, do it on your own. Only IE is going to be officially
> supported.
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