about:mozilla » Platform development

SVG effects for HTML content

deb — Mon, 22 Sep 2008 15:15:02 +0000

Robert O’Callahan has been working on adding features to Firefox that allow SVG effects to be applied to HTML content. He originally posted about this work back in June, discussing his experiments with making SVG’s “clip-path”, “mask”, and “filter” properties work when applied to HTML content. Last week Robert announced that this work has been added to the main Mozilla code base, and further that he has submitted his proposal to the SVG working group for standardization. For more information about these new features, including screenshots of them in action and working demos, see Robert’s post on the Web Tech weblog.

Color profile support changes

deb — Fri, 19 Sep 2008 15:56:45 +0000

Bobby Holley has been refining Mozilla’s color management backend, working to improve performance and polish the feature so it’s ready for “prime time”. These efforts have clearly paid off, as color profile support has now been turned on by default for tagged images in the latest Firefox nightly builds. In this context, “tagged images” are any images displayed in the web browser that have an embedded ICC color profile — in other words, images that contain the information needed to do a specific and accurate color transformation. Bobby’s post goes into all the technical aspects of these changes in detail, and also discusses why color management hasn’t been enabled for everything at this time. Percy Cabello has also posted about these changes over at Mozilla Links.

CSS transforms

deb — Fri, 19 Sep 2008 15:54:17 +0000

The folks over at the Web Tech weblog have posted that Gecko (Mozilla’s layout engine) nightly builds now support a new “-moz-transform” CSS property. This property — a version of which is similarly supported by WebKit — is described as a “CSS property that accepts a list of transform functions (generic affine linear transforms) and then applies those transforms, in order, to the HTML elements the property is applied to.” Several examples of how to use the property (and descriptions of what it does) are available in the Web Tech post. “It will be interesting to see what uses developers find for CSS transforms. Much of the functionality once reserved for plugins can now be directly integrated into CSS and JavaScript.” More information and code samples are available in the Web Tech article.

nsITraceableChannel, Intercept HTTP traffic

deb — Fri, 19 Sep 2008 15:52:00 +0000

Jan Odvarko writes, “Since bug 430155 (”new nsHttpChannel interface to allow examination of HTTP data before it is passed to the channel’s creator”) is now fixed, it’s possible to intercept HTTP traffic from within a Firefox extension!” Jan estimates that this fix will be part of Firefox 3.0.3, and points out that this feature is crucial for Firebug as one of that add-on’s features is the ability to display the response of any HTTP request made by a page. To this point, Firebug has been making use of the Firefox cache and XHR monitoring to implement this feature, but there are several issues with this approach that make it suboptimal. For more information about this new feature, including examples of how to make use of it in Firefox add-ons, read Jan’s article at his Software is hard weblog.

TraceMonkey and Firefox Mobile

deb — Mon, 15 Sep 2008 15:12:30 +0000

Over the past few weeks, Vladimir Vukićević has been working on getting TraceMonkey working on the ARM architecture which is frequently used in mobile and handheld devices. “[M]obile and handheld platforms are going to quickly become consumers of the full web, and core performance gains will often yeild much more significant user-perceptible performance improvements. The result of all this work will be a richer web experience on mobile and embedded devices, by allowing those users to take advantage of modern web applications that do much of their work on the browser instead of server side.” Vlad’s TraceMonkey work will be available for testing in the next alpha release of Fennec (the code name for Firefox Mobile) by enabling a configuration setting the same way testers can enable TraceMonkey in Firefox nightly builds. For more information, including a host of technical details, see Vlad’s weblog.

Ars Technica article about Firefox, Gecko, and WebKit

deb — Mon, 15 Sep 2008 15:10:57 +0000

Ryan Paul of Ars Technica posted an interesting two-page article last week explaining why Mozilla remains committed to Gecko while WebKit popularity is increasing. As WebKit has been adopted by more browsers, Ryan writes, “some technology enthusiasts are beginning to wonder if the days are numbered for Mozilla’s Gecko rendering engine.” This is not at all the case, however, and “those who understand the differences between the two rendering engines and have an appreciation of Gecko’s technical strengths recognize that there is no basis for speculation about the possibility of Mozilla adopting [WebKit] for future versions of Firefox.” In the article, Ryan discusses WebKit’s strengths, why Apple opted for WebKit over Gecko in 2003, how Gecko has evolved and improved since, why Gecko is preferred by a host of third-party developers, and more.

In writing the article, Ryan spoke with Mike Shaver, Mozilla’s VP of Engineering. “Although [Shaver] respects the technical achievements of WebKit, he believes that the WebKit development model and fragmentation in the WebKit ecosystem would create serious challenges that make it unsuitable for Firefox.” Shaver goes into much more detail in the article, which you can find over on the Ars Technica site.

JavaScript benchmark quality

deb — Fri, 12 Sep 2008 14:29:30 +0000

While JavaScript engine performance has been undergoing a renaissance, JavaScript benchmark tests haven’t been keeping pace, and aren’t adapting well to the rapid performance increases we’ve been seeing. John Resig has put together a post analysing the problem, looking at three different benchmark suites — SunSpider, Dromaeo, and V8 Benchmark — and what they are doing to counter-act the problem of error levels increasing as browsers are able to run the tests more and more quickly. It’s a detailed and interesting peek into the world of JavaScript benchmarking, and you can read John’s full post on his weblog.

Tracing the Web: Andreas Gal on the new TraceMonkey JavaScript engine

deb — Mon, 08 Sep 2008 14:30:21 +0000

For the past two months Andreas Gal has been part of the Mozilla team working on a just-in-time (JIT) compiler for the JavaScript engine in Firefox. On August 22nd the project (code named “TraceMonkey”) was added to the main Firefox development code base.

Andreas writes, “TraceMonkey is a trace-based JIT compiler and it pushes the envelope on JavaScript performance. On average, we speed up Apple’s popular SunSpider benchmarks by a factor of 4.6 over the last release of Firefox. For the SunSpider ubench suite, which focuses on core JavaScript language features, we achieve a speedup of 22x. Whichever metric you chose to apply, Firefox now has the fastest JavaScript engine in the world.” Andreas’ post goes on to discuss the concepts and background behind TraceMonkey in detail, including dynamic compilation with traces, trace trees and nested trace trees, and type specialization. You can read the full article at Andreas’ weblog.

TraceMonkey vs. V8: JavaScript performance results

deb — Fri, 05 Sep 2008 15:07:30 +0000

JavaScript is an increasingly vital aspect of web browser performance since many web applications (web mail, online word processors, and so forth) rely heavily on complex JavaScript programs for their core functionality. In the past year, JavaScript performance has gone through somewhat of a renaissance, with massive strides being made by JavaScript developers working on several different projects. The two most recent developments come from Mozilla and Google — Mozilla’s new TraceMonkey engine that is part of Firefox 3.1 development, and Google’s new V8 engine that is part of the Google Chrome beta.

Brendan Eich has run some performance tests, and has posted the results of the head-to-head showdown in which he pitted the engines against each other using the SunSpider test suite on Windows XP and Windows Vista (Google Chrome is not currently available for either Mac or Linux). Brendan writes, “[TraceMonkey] win[s] by 1.28x and 1.19x respectively,” but adds that SunSpider is “one popular yet arguably non-representative benchmark suite.” He finishes by pointing out that “this contest is not a playoff where each contending VM is eliminated at any given hype-event point,” going on to sketch the rough outlines of the approach the team is taking to further improve TraceMonkey performance.

Brendan’s complete test results and commentary are available on his weblog. Further information about TraceMonkey and JavaScript performance is available through web posts by Mike Shaver, Andreas Gal, and John Resig.

Drag and Drop is here

deb — Fri, 05 Sep 2008 13:33:33 +0000

Neil Deakin has posted a development update about the inclusion of the HTML5 drag and drop API in Mozilla nightly builds. “This is the API that IE and Safari have supported for a while. Now Firefox will support it as well so you can create content in your web pages that can be dragged and dropped elsewhere. The same API is also used for Firefox extensions and XUL applications.” For more information, including examples about how to make things draggable, see Neil’s weblog post. Drag and drop documentation is available at the Mozilla Developer Center.