[webkit-qt] QtWebKit 2.3.2 and QtWebKit for Qt 5.1

Richard Gerd Kuesters richard at humantech.com.br
Mon Jul 15 05:38:52 PDT 2013

Congratulations to the WebKit-Qt team!

I've been using Qt 5.1 since early beta versions, as I was informed (in 
this same list) about limitations on running JavaScript on 64 bit 
Windows boxes.

I'm very pleased by this release! I can now use Qt all over my 
applications and axe all MFC and Internet Explorer compatible (so far 
the only 64 JIT in Windows) code! This is simply awesome! :)

I can also say here that I successfully compiled Qt 5.1 (and WebKit) 
using VS2008, running it even on Windows XP. It also looks too good to 
be true ;)

And, one last thing: no more VMs with Windows to develop :)

Again, thank you all for your efforts.

Best regards,

On 07/15/2013 09:12 AM, Allan Sandfeld Jensen wrote:
> Hello WebKit-Qt
> Thursday I tagged QtWebKit 2.3.2. To avoid confusion I will present both
> QtWebKit for Qt 5.1 and QtWebKit 2.3.2.
> The new features in QtWebKit for Qt 5.1 can be seen on http://qt-project.org/wiki/New-Features-in-Qt-5.1 . Let me expand a few interesting ones
> below:
> Windows 64bit JIT: In QtWebKit 5.0 and QtWebKit 2.3.1 we only supported
> interpreted JavaScriptCore on 64bit Windows. The issue is that unlike 32bit
> x86, x64 has different calling conversions on Windows and Linux, so the it
> requires different JIT implementations to work on Win64, and on top of that
>   Note that x64 is still not as fast as x86 on windows or x64 on linux. Only
> first generation JIT has been implemented, the second generation DFG JIT is
> not available. This work was also cherry-picked forQtWebKit 2.3.2
> MIPS JavaScriptCore: MIPS have had second level DFG JIT implemented. This work
> was also cherry-picked for QtWebKit 2.3.2. Note the at WebKit MIPS
> implementation is limited to the O32 binary format and calling convention, and
> requires 64bit floating-point any other MIPS configuration will default to
> interpreted.
> Improved garbage collection: Garbage collection have been improved by
> implemented the activity triggered garbage collected and the incremental
> sweeping garbage collector. The first means that garbage collection can now be
> triggered by new allocations. This is more likely to keep the memory usage
> constant, by spending time to find garbage each time more memory are
> allocated. The second means that garbage collection will now run incrementally
> which means JS will now cause shorter CPU stalls when under pressure.
> Improved font rendering: In Qt 5.1 QtWebkit now defaults to enabling font
> kerning  Previously kerning could be enabled using '-webkit-font-kerning:
> normal' but  doing so would incur a big performance hit because a complex font
> rendering path would be used (the slowl path used when complex shaping is
> required). In Qt 5.1 we can now renderer kerned text in the fast font
> rendering path, which means we can now enable it when '-webkit-font-kerning'
> is set to 'auto' which is default. This is Qt 5.1 only because it depends on
> new features added there.
> Support for WOFF fonts: We have added support for the WOFF web-font format.
> This feature depends on the presence of the zlib library when building WebKit.
> This work was also cherry-picked for QtWebKit 2.3.2.
> Qt 5.1 is available at http://qt-project.org/downloads
> QtWebKit 2.3 for Qt 4.8 is maintained at https://gitorious.org/+qtwebkit-developers/webkit/qtwebkit-23 and the tarball 2.3.2 is
> https://gitorious.org/+qtwebkit-developers/webkit/qtwebkit-23/commit/2f529cca5356e2214560a62f4bff2f4ba793e119
> Best wishes here from Bilbao (Akademy + QtCS)
> `Allan Jensen (carewolf)
> _______________________________________________
> webkit-qt mailing list
> webkit-qt at lists.webkit.org
> https://lists.webkit.org/mailman/listinfo/webkit-qt

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