diff options
| author | Julien Brianceau <jbrianceau@nds.com> | 2012-11-07 16:35:34 +0100 |
|---|---|---|
| committer | The Qt Project <gerrit-noreply@qt-project.org> | 2012-11-08 11:35:15 +0100 |
| commit | 5a9cdc701e6f7a5e9af09dddad9ca3a4834c252b (patch) | |
| tree | 582b3a051847f48523e36945b49b20350593fe64 /src/gui | |
| parent | 708985baa7753ad12aad986b4ab175f49b922be9 (diff) | |
qpa: Fix rendering issue in blitter engine (negative scaling factors)
A 180° rotation results in a TxScale QTransform with negative scaling
factors (x=-1.0 y=-1.0). This is not properly handled by blitter paint
engine yet, so use software rendering fallback in this case.
This rendering issue can be seen when using "-webkit-transform" CSS
property in WebKit with DirectFB QPA platform.
cherry-picked from qt5/qtbase 07ea3cf0b3883979e84bd91a5dc6a7a126de3123
Change-Id: I0911fd1166a3968d0a1d6bcca47ce2b26866de44
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>
Diffstat (limited to 'src/gui')
| -rw-r--r-- | src/gui/painting/qpaintengine_blitter.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/gui/painting/qpaintengine_blitter.cpp b/src/gui/painting/qpaintengine_blitter.cpp index cbf42bbaac..5ee2bc9fec 100644 --- a/src/gui/painting/qpaintengine_blitter.cpp +++ b/src/gui/painting/qpaintengine_blitter.cpp @@ -330,7 +330,11 @@ void QBlitterPaintEnginePrivate::updateTransformState(QPainterState *s) { QTransform::TransformationType type = s->matrix.type(); - caps.updateState(STATE_XFORM_COMPLEX, type > QTransform::TxScale); + // consider scaling operations with a negative factor as "complex" for now. + // as some blitters could handle axisymmetrical operations, we should improve blitter + // paint engine to handle them as a capability + caps.updateState(STATE_XFORM_COMPLEX, (type > QTransform::TxScale) || + ((type == QTransform::TxScale) && ((s->matrix.m11() < 0.0) || (s->matrix.m22() < 0.0)))); caps.updateState(STATE_XFORM_SCALE, type > QTransform::TxTranslate); hasXForm = type >= QTransform::TxTranslate; |