You haven't posted in a while!
This is true! And I do apologize, I've been very busy and hope to post more again in the near future. I particularly apologize for comments which I might've missed, my blog started getting covered with spam comments and it became impossible to separate the good from the bad. I've mass deleted over 2000 spam comments and updated both the blog software and the antispam blacklist. Hopefully things will be better now.
Azure is a new graphics component that we've been developing for use with Mozilla. Considering Joe Drew has already done an excellent blog post on the subject I won't be going into it in much detail. You can find his blog post here, if you haven't yet I recommend you read it before you continue reading this post!
So what's the current status?
Well, we set a goal for ourselves to implement the Azure API on Direct2D for Q2. So this is what I've been working on for the last couple of weeks, in addition to that we've created an implementation of Canvas2D that sits on top of Azure. The sum of that work resulted in a build of mozilla that can run a canvas implementation based on the new Azure API. This has allowed me to do performance and correctness comparisons between the current Canvas code based on the cairo Direct2D backend, and the new code based on Azure. The latest builds feature an implementation of canvas on the Azure D2D backend that is almost as good in terms of correctness as the cairo version. In some cases even better!
Almost? What's broken?
So there's a couple of issues that still need to be resolved, the main correctness problems are:
So, what about performance?
In general, you should see much improved performance for Canvas2D in a Direct2D environment. Almost any test will perform either at the same performance level, or better. Some tests will benefit greatly, while others will basically stay the same, this mainly depends on where the bottlenecks for the tests are. There are however still some performance pitfalls, where Azure may be slightly slower than Cairo. Most of these cases should be resolved in the coming time. At the moment also the initialization of Azure canvases is slightly more expensive than normal, this should easily be offset by improved performance though!
I ran several benchmarks comparing Azure canvas performance to the Cairo Direct2D backend canvas performance. Here's a nice chart:
In addition to these tests there were some tests which weren't easy to include in the chart since they didn't report frames per second. Two notable ones are the IE Testdrive 'Speed Reading' test, which ran in 6 seconds both with Azure and Cairo, however reported an average drawing time of 5 ms for Azure, and 8 ms for Cairo. Possibly the total time ended up still being the same due to the nature of timeouts in Firefox. A more outspoken difference was the IE TestDrive Paintball demo, which ran in 10.91 seconds on Azure versus almost 30 seconds on Cairo!
All in all we're very happy with these results and hopefully future optimizations will improve them further.
I want to see this for myself!
Well, you can! I've made a build with Azure available here. Using this build Azure will be enabled by default -if- you have Direct2D support. If your system does not support Direct2D (you can check in the 'about:support' page), this will function practically as a normal nightly build. You can switch azure on and off through the 'gfx.canvas.azure.enabled' preference on the 'about:config' page.
Some info for people who want to do their own testing:
Well, first we have to iron out the last quirks and get AzureD2D canvases shipped. Once that's done it will mark a major milestone in the Azure project. Soon to follow should be an Azure implementation in Quartz, bringing performance improvements to our Mac audience. The next, possibly most interesting step for Azure will be a larger project: creating a backend that can use the GPU for rendering vector graphics through OpenGL and different Direct3D versions. This will hopefully allow us to bring fast, consistent rendering performance to our users on all platforms!
Eventually all browser rendering, and not just Canvas, should run through Azure, further improving your browsing experience in Firefox!
|<< <||> >>|