diff options
| author | Julien Brianceau <jbrianceau@nds.com> | 2012-11-07 11:01:08 +0100 |
|---|---|---|
| committer | The Qt Project <gerrit-noreply@qt-project.org> | 2012-11-07 14:19:00 +0100 |
| commit | 07ea3cf0b3883979e84bd91a5dc6a7a126de3123 (patch) | |
| tree | 0f7164f0dafc3b4c637f07f445e6945884930386 /src | |
| parent | 2027f204b5deba93135349da27e58c9d6f6a8aed (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.
Change-Id: Iee496b6bf0c90ffe36c4235ceaa2c80f296b2ca4
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>
Diffstat (limited to 'src')
| -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 1acdf8c433..c45513b4aa 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; |