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Diffstat (limited to 'doc/src/qt4-intro.qdoc')
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1 files changed, 65 insertions, 7 deletions
diff --git a/doc/src/qt4-intro.qdoc b/doc/src/qt4-intro.qdoc index 8684ad2312..919bb880de 100644 --- a/doc/src/qt4-intro.qdoc +++ b/doc/src/qt4-intro.qdoc @@ -476,7 +476,7 @@ QML UIs through drag-and-drop. The text editor supports the QML syntax and provides authoring assistance such as auto-completion, error lookup, help lookup and easy preview of QML UI's. The Qt - Quick features in Qt Creator will be released with Qt Creator 2.1 + Quick features in Qt Creator will be released with Qt Creator 2.1 \endlist \section1 Network Bearer Management @@ -489,14 +489,72 @@ QNetworkAccessManager uses this API for HTTP level roaming. - \section1 Multimedia - playback and declarative elements + \section1 Feature Improvements in QtWebKit - The Multimedia API provides media playback and playlist support - for Qt Applications. Play music and movies through a single interface - with selectable output for movies to widgets or graphics view. + The QGraphicsWebView class has a new tiled backing store, which + improves scrolling and zooming performance. You can even create + animated zoom-in or zoom-out effects (see + QWebSettings::TiledBackingStoreEnabled). - Multimedia support for Quick is also available with the new multimedia - declarative elements. + On mobile platforms, it is often useful to avoid displaying + separate scrollbars for iframes and framesets. If you switch on + frame flattening, QtWebKit will resize frames to fit their content + to avoid separate scrollbars (see + QWebSettings::FrameFlatteningEnabled). + + Qt 4.7 adds support for accelerated compositing, which enhances + the performance of CSS animations and transitions. Read more in + \l{http://labs.trolltech.com/blogs/2010/05/17/qtwebkit-now-accelerates-css-animations-3d-transforms/}{this blog}. + + For hybrid QtWebKit and C++ projects, Qt 4.7 has added support for + transporting \l{QPixmap}s between Qt C++ and WebKit. We have also + improved the documentation hybrid development. Read more here: + \l{The QtWebKit Bridge}. + + \section1 QtWebKit Performance Benchmarks + + We have introduced a set of performance benchmarks for QtWebKit, + and made numerous improvements in rendering performance, page + loading performance, scrolling performance and CSS performance. + Here are some examples from the benchmarks run on a 64-bit Linux + workstation with the raster graphics system. + + In a benchmark that measures the scrolling performance on popular + websites, we found out that Qt 4.7.0 on this platform is 350% + faster than Qt 4.6.0, thanks to several rendering related + improvements. + + Our page loading benchmark shows an improvement of 16% in Qt 4.7.0 + from Qt 4.6.0. This is due to improvements in text layout speed, + image decoding, resource loading and event handling. + + Several CSS animation benchmarks indicate a speed improvement of + 31% from Qt 4.6.0 to Qt 4.7.0. These benchmarks are effectively + showing the improvement we get from accelerated compositing (see + above). + + \section1 Other Performance Related Improvements + + In addition to the QtWebKit module, performance has been a focus + area in Qt 4.7 throughout the Qt framework. Here are a couple of + examples about performance related feature improvements. + + On Mac OS X, Qt now uses a different widget implementation (called + "alien widgets"), which improves the responsiveness of + applications that have complex user interfaces with several + widgets. + + Qt 4.7 introduces the QStaticText class, which can be used to + improve text rendering performance. More info is available from + \l{http://labs.trolltech.com/blogs/2010/03/01/insanity-is-shaping-the-same-text-again-and-expecting-a-different-result/}{this blog}. + + The QPainter class has a new API for rendering pixmap fragments + (QPainter::drawPixmapFragments), which can improve the rendering + performance of applications that need to render + \l{QPainter::drawPixmapFragments()}{pixmap fragments}. + + Qt 4.7 has an updated version of the JavaScriptCore engine for the + QtScript module, which improves JavaScript execution performance. \section1 New Classes, Functions, Macros, etc. |