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Fix illegal memory access on simple image rotates

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Clip the transformed and rounded sourceClip to the source rectangle,
so we don't try to rotate pixels outside the source.

Task-number: QTBUG-56252
Change-Id: Ib9cb80f9856724118867aea37ead0b02a6c71495
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>
This commit is contained in:
Allan Sandfeld Jensen 2016-10-05 15:45:55 +02:00 committed by Allan Sandfeld Jensen
parent e732e432ab
commit f3ce959de6
2 changed files with 21 additions and 0 deletions
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2
src/gui/painting/qpaintengine_raster.cpp
View File

@ -2273,6 +2273,8 @@ void QRasterPaintEngine::drawImage(const QRectF &r, const QImage &img, const QRe
= QRectF(sr.x() + clippedTargetRect.x() - r.x(), sr.y() + clippedTargetRect.y() - r.y(),
clippedTargetRect.width(), clippedTargetRect.height()).toRect();
clippedSourceRect = clippedSourceRect.intersected(img.rect());
uint dbpl = d->rasterBuffer->bytesPerLine();
uint sbpl = img.bytesPerLine();

19
tests/auto/gui/painting/qpainter/tst_qpainter.cpp
View File

@ -307,6 +307,8 @@ private slots:
void QTBUG50153_drawImage_assert();
void QTBUG56252();
private:
void fillData();
void setPenColor(QPainter& p);
@ -5078,6 +5080,23 @@ void tst_QPainter::QTBUG50153_drawImage_assert()
}
}
void tst_QPainter::QTBUG56252()
{
QImage sourceImage(1770, 1477, QImage::Format_RGB32);
QImage rotatedImage(1478, 1771, QImage::Format_RGB32);
QTransform transformCenter;
transformCenter.translate(739.0, 885.5);
transformCenter.rotate(270.0);
transformCenter.translate(-885.0, -738.5);
QPainter painter;
painter.begin(&rotatedImage);
painter.setTransform(transformCenter);
painter.drawImage(QPoint(0, 0),sourceImage);
painter.end();
// If no crash or illegal memory read, all is fine
}
QTEST_MAIN(tst_QPainter)
#include "tst_qpainter.moc"