[webkit-qt] QtWebKit 2.3.2 and QtWebKit for Qt 5.1
Allan Sandfeld Jensen
kde at carewolf.com
Mon Jul 15 05:12:11 PDT 2013
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
Windows 64bit JIT: In QtWebKit 5.0 and QtWebKit 2.3.1 we only supported
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
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
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
Best wishes here from Bilbao (Akademy + QtCS)
`Allan Jensen (carewolf)
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