diff options
Diffstat (limited to 'src/gui/painting/qpaintengine.cpp')
| -rw-r--r-- | src/gui/painting/qpaintengine.cpp | 23 |
1 files changed, 10 insertions, 13 deletions
diff --git a/src/gui/painting/qpaintengine.cpp b/src/gui/painting/qpaintengine.cpp index 91c4e3528f..09b1f0a8e4 100644 --- a/src/gui/painting/qpaintengine.cpp +++ b/src/gui/painting/qpaintengine.cpp @@ -152,14 +152,16 @@ QFont QTextItem::font() const \brief The QPaintEngine class provides an abstract definition of how QPainter draws to a given device on a given platform. - Qt 4.0 provides several premade implementations of QPaintEngine for the - different painter backends we support. We provide one paint engine for each - window system and painting framework we support. This includes X11 on - Unix/Linux and CoreGraphics on Mac OS X. In addition we provide QPaintEngine - implementations for OpenGL (accessible through QOpenGLWidget) and PostScript - (accessible through QPSPrinter on X11). Additionally there is a raster-based - paint engine that is a fallback for when an engine does not support a certain - capability. + Qt provides several premade implementations of QPaintEngine for the + different painter backends we support. The primary paint engine + provided is the raster paint engine, which contains a software + rasterizer which supports the full feature set on all supported platforms. + This is the default for painting on QWidget-based classes in e.g. on Windows, + X11 and Mac OS X, it is the backend for painting on QImage and it is + used as a fallback for paint engines that do not support a certain + capability. In addition we provide QPaintEngine implementations for + OpenGL (accessible through QGLWidget) and printing (which allows using + QPainter to draw on a QPrinter object). If one wants to use QPainter to draw to a different backend, one must subclass QPaintEngine and reimplement all its virtual @@ -169,11 +171,6 @@ QFont QTextItem::font() const QPaintEngine is created and owned by the QPaintDevice that created it. - The big advantage of the QPaintEngine approach opposed to - Qt 3's QPainter/QPaintDevice::cmd() approach is that it is now - possible to adapt to multiple technologies on each platform and take - advantage of each to the fullest. - \sa QPainter, QPaintDevice::paintEngine(), {Paint System} */ |