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| author | Bjoern Erik Nilsen <bjorn.nilsen@nokia.com> | 2009-05-08 14:00:57 (GMT) |
|---|---|---|
| committer | Bjørn Erik Nilsen <bjorn.nilsen@nokia.com> | 2009-05-15 15:55:44 (GMT) |
| commit | 59cc08796bfb88bc0010006f365f1361462761aa (patch) | |
| tree | 44eebedc40e44546a5788cfb3ac497f1bab7e7d6 /dist/changes-4.6.0 | |
| parent | b0095f7f8925cf571224d348124f08c56f7f46e9 (diff) | |
| download | Qt-59cc08796bfb88bc0010006f365f1361462761aa.zip Qt-59cc08796bfb88bc0010006f365f1361462761aa.tar.gz Qt-59cc08796bfb88bc0010006f365f1361462761aa.tar.bz2 | |
Graphics View Optimization: Use a simple style option by default.
QStyleOptionGraphicsItem extends QStyleOption with three values:
1) matrix, 2) levelOfDetail, 3) exposedRect, and they all
involve expensive QTranform operations when calculated. We
pass style option(s) to drawItems() and paint(), but the
extended values are usually not in use. We can therefore gain
quite some nice speedup by making them opt-in with the
QGraphicsItem::ItemUsesExtendedStyleOption flag.
Additionally, QStyleOptionGraphicsItem::levelOfDetail has been
obsoleted, and a new function QStyleOptionGraphicsItem::
levelOfDetailFromTransform(const QTransform &) has been added.
Me and Andreas don't consider this change to be too controversial
even though it changes the behavior.
Auto tests still pass.
Reviewed-by: Andreas
Diffstat (limited to 'dist/changes-4.6.0')
| -rw-r--r-- | dist/changes-4.6.0 | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/dist/changes-4.6.0 b/dist/changes-4.6.0 index db4ab5f..6a94f26 100644 --- a/dist/changes-4.6.0 +++ b/dist/changes-4.6.0 @@ -38,4 +38,14 @@ information about a particular change. - The experimental Direct3D paint engine has been removed. The reasons for this is that Qt Software focuses on OpenGL for desktop - hardware accelerated rendering.
\ No newline at end of file + hardware accelerated rendering. + + - QStyleOptionGraphicsItem::exposedRect and QStyleOptionGraphicsItem::matrix + does no longer contain fine-grained values when passed in drawItems()/paint() + unless the QGraphicsItem::ItemUsesExtendedStyleOptions flag is enabled. + By default, exposedRect is initialized to the item's bounding rect + and the matrix is untransformed. + + - QStyleOptionGraphicsItem::levelOfDetails is obsoleted and its value + is always initialized to 1. For a more fine-grained value use + QStyleOptionGraphicsItem::levelOfDetailFromTransform(const QTransform &). |