AuroraMiddleware/qt5base-lts
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QSpanData: use isAffine() instead of rolling your own test

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QSpanData did not properly check that whether the matrix is an affine
transformation or not. Therefore, qt paint engine chose the wrong
algorithm for drawing in case of a perpective matrix.

Change-Id: If0523bd45e86679a08874713da3fbe33a9852551
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
This commit is contained in:
Vitaliy Kharin 2012-12-10 18:45:31 +04:00 committed by The Qt Project
parent 508db17de3
commit 49ba35b990
1 changed files with 1 additions and 1 deletions
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src/gui/painting/qpaintengine_raster.cpp
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@ -4588,7 +4588,7 @@ void QSpanData::setupMatrix(const QTransform &matrix, int bilin)
txop = inv.type();
bilinear = bilin;
const bool affine = !m13 && !m23;
const bool affine = inv.isAffine();
fast_matrix = affine
&& m11 * m11 + m21 * m21 < 1e4
&& m12 * m12 + m22 * m22 < 1e4