diff options
| -rw-r--r-- | src/gui/painting/qdrawhelper.cpp | 6 | ||||
| -rw-r--r-- | tests/auto/gui/painting/qpainter/tst_qpainter.cpp | 26 |
2 files changed, 30 insertions, 2 deletions
diff --git a/src/gui/painting/qdrawhelper.cpp b/src/gui/painting/qdrawhelper.cpp index 87ceb9a89d..28c7099d3c 100644 --- a/src/gui/painting/qdrawhelper.cpp +++ b/src/gui/painting/qdrawhelper.cpp @@ -1938,9 +1938,10 @@ static const uint * QT_FASTCALL fetchTransformedBilinearARGB32PM(uint *buffer, c // intermediate_buffer[0] is a buffer of red-blue component of the pixel, in the form 0x00RR00BB // intermediate_buffer[1] is the alpha-green component of the pixel, in the form 0x00AA00GG + // +1 for the last pixel to interpolate with, and +1 for rounding errors. quint32 intermediate_buffer[2][buffer_size + 2]; // count is the size used in the intermediate_buffer. - int count = qCeil(length * data->m11) + 2; //+1 for the last pixel to interpolate with, and +1 for rounding errors. + int count = (qint64(length) * fdx + fixed_scale - 1) / fixed_scale + 2; Q_ASSERT(count <= buffer_size + 2); //length is supposed to be <= buffer_size and data->m11 < 1 in this case int f = 0; int lim = count; @@ -2448,12 +2449,13 @@ static const uint *QT_FASTCALL fetchTransformedBilinear(uint *buffer, const Oper // The idea is first to do the interpolation between the row s1 and the row s2 // into an intermediate buffer, then we interpolate between two pixel of this buffer. FetchPixelsFunc fetch = qFetchPixels[layout->bpp]; + // +1 for the last pixel to interpolate with, and +1 for rounding errors. uint buf1[buffer_size + 2]; uint buf2[buffer_size + 2]; const uint *ptr1; const uint *ptr2; - int count = qCeil(length * data->m11) + 2; //+1 for the last pixel to interpolate with, and +1 for rounding errors. + int count = (qint64(length) * fdx + fixed_scale - 1) / fixed_scale + 2; Q_ASSERT(count <= buffer_size + 2); //length is supposed to be <= buffer_size and data->m11 < 1 in this case if (blendType == BlendTransformedBilinearTiled) { diff --git a/tests/auto/gui/painting/qpainter/tst_qpainter.cpp b/tests/auto/gui/painting/qpainter/tst_qpainter.cpp index 1ed78fa0ef..8c72532122 100644 --- a/tests/auto/gui/painting/qpainter/tst_qpainter.cpp +++ b/tests/auto/gui/painting/qpainter/tst_qpainter.cpp @@ -305,6 +305,8 @@ private slots: void drawPolyline_data(); void drawPolyline(); + void QTBUG50153_drawImage_assert(); + private: void fillData(); void setPenColor(QPainter& p); @@ -5052,6 +5054,30 @@ void tst_QPainter::drawPolyline() QCOMPARE(images[0], images[1]); } +void tst_QPainter::QTBUG50153_drawImage_assert() +{ + QImage::Format formats[] = { + QImage::Format_RGB32, // fetchTransformedBilinearARGB32PM + QImage::Format_ARGB32 // fetchTransformedBilinear + }; + + for (unsigned i = 0; i < sizeof(formats) / sizeof(formats[0]); i++) { + QImage image(3027, 2999, formats[i]); + + QImage backingStore(image.size(), QImage::Format_ARGB32); + QPainter backingStorePainter(&backingStore); + + QTransform transform; + transform.scale( 0.999987, 0.999987 ); + + backingStorePainter.setTransform(transform); + backingStorePainter.setRenderHint(QPainter::SmoothPixmapTransform, true); + backingStorePainter.drawImage(0, 0, image); + + // No crash, all fine + } +} + QTEST_MAIN(tst_QPainter) #include "tst_qpainter.moc" |