Avoid division by zero

At least JunitTest_framework_copmlex triggered the UBSan failure

> vcl/headless/svpgdi.cxx:924:46: runtime error: division by zero
>     #0 0x2b7114500e3b in renderSource(_cairo*, SalTwoRect const&, _cairo_surface*) vcl/headless/svpgdi.cxx:924:46
>     #1 0x2b711450074c in SvpSalGraphics::copySource(SalTwoRect const&, _cairo_surface*) vcl/headless/svpgdi.cxx:937:33
>     #2 0x2b7114501f37 in SvpSalGraphics::copyBits(SalTwoRect const&, SalGraphics*) vcl/headless/svpgdi.cxx:980:5
>     #3 0x2b7113461871 in SalGraphics::CopyBits(SalTwoRect const&, SalGraphics*, OutputDevice const*, OutputDevice const*) vcl/source/gdi/salgdilayout.cxx:529:9
>     #4 0x2b711359a1fc in VirtualDevice::InnerImplSetOutputSizePixel(Size const&, bool, unsigned char*) vcl/source/gdi/virdev.cxx:352:17
>     #5 0x2b711359bef6 in VirtualDevice::ImplSetOutputSizePixel(Size const&, bool, unsigned char*) vcl/source/gdi/virdev.cxx:391:9
>     #6 0x2b711359edc0 in VirtualDevice::SetOutputSizePixel(Size const&, bool) vcl/source/gdi/virdev.cxx:437:12
>     #7 0x2b70fa4b6f3f in sdr::overlay::OverlayManagerBuffered::ImpPrepareBufferDevice() svx/source/sdr/overlay/overlaymanagerbuffered.cxx:45:17
>     #8 0x2b70fa4c0c2c in sdr::overlay::OverlayManagerBuffered::ImpSaveBackground(vcl::Region const&, OutputDevice*) svx/source/sdr/overlay/overlaymanagerbuffered.cxx:159:13
>     #9 0x2b70fa4cecab in sdr::overlay::OverlayManagerBuffered::completeRedraw(vcl::Region const&, OutputDevice*) const svx/source/sdr/overlay/overlaymanagerbuffered.cxx:414:17
>     #10 0x2b70fa787fc4 in SdrPaintWindow::DrawOverlay(vcl::Region const&) svx/source/svdraw/sdrpaintwindow.cxx:334:13
>     #11 0x2b70fb9d388f in SdrPaintView::EndCompleteRedraw(SdrPaintWindow&, bool) svx/source/svdraw/svdpntv.cxx:753:9
>     #12 0x2b70fd77da81 in FmFormView::EndCompleteRedraw(SdrPaintWindow&, bool) svx/source/form/fmview.cxx:474:5
>     #13 0x2b70fb9d64a0 in SdrPaintView::EndDrawLayers(SdrPaintWindow&, bool) svx/source/svdraw/svdpntv.cxx:789:5
>     #14 0x2b7182085fe9 in SwViewShell::DLPostPaint2(bool) sw/source/core/view/viewsh.cxx:240:9
>     #15 0x2b71820d94c5 in SwViewShell::Paint(OutputDevice&, Rectangle const&) sw/source/core/view/viewsh.cxx:1797:21
>     #16 0x2b717c26e635 in SwCursorShell::Paint(OutputDevice&, Rectangle const&) sw/source/core/crsr/crsrsh.cxx:1273:5
>     #17 0x2b71839ae182 in SwEditWin::Paint(OutputDevice&, Rectangle const&) sw/source/uibase/docvw/edtwin2.cxx:475:9
>     #18 0x2b71100ee7e0 in PaintHelper::DoPaint(vcl::Region const*) vcl/source/window/paint.cxx:309:13
>     #19 0x2b71100ff14a in vcl::Window::ImplCallPaint(vcl::Region const*, unsigned short) vcl/source/window/paint.cxx:611:9
>     #20 0x2b71100fb252 in PaintHelper::~PaintHelper() vcl/source/window/paint.cxx:549:17
>     #21 0x2b71100ff463 in vcl::Window::ImplCallPaint(vcl::Region const*, unsigned short) vcl/source/window/paint.cxx:614:1
>     #22 0x2b71100fb252 in PaintHelper::~PaintHelper() vcl/source/window/paint.cxx:549:17
>     #23 0x2b71100ff463 in vcl::Window::ImplCallPaint(vcl::Region const*, unsigned short) vcl/source/window/paint.cxx:614:1
>     #24 0x2b71100fb252 in PaintHelper::~PaintHelper() vcl/source/window/paint.cxx:549:17
>     #25 0x2b71100ff463 in vcl::Window::ImplCallPaint(vcl::Region const*, unsigned short) vcl/source/window/paint.cxx:614:1
>     #26 0x2b71100fb252 in PaintHelper::~PaintHelper() vcl/source/window/paint.cxx:549:17
>     #27 0x2b71100ff463 in vcl::Window::ImplCallPaint(vcl::Region const*, unsigned short) vcl/source/window/paint.cxx:614:1
>     #28 0x2b71100fb252 in PaintHelper::~PaintHelper() vcl/source/window/paint.cxx:549:17
>     #29 0x2b71100ff463 in vcl::Window::ImplCallPaint(vcl::Region const*, unsigned short) vcl/source/window/paint.cxx:614:1
>     #30 0x2b7110100536 in vcl::Window::ImplCallOverlapPaint() vcl/source/window/paint.cxx:635:9
>     #31 0x2b7110102811 in vcl::Window::ImplHandlePaintHdl(Idle*) vcl/source/window/paint.cxx:667:9
>     #32 0x2b7110100ee7 in vcl::Window::LinkStubImplHandlePaintHdl(void*, Idle*) vcl/source/window/paint.cxx:645:1
>     #33 0x2b71101446d7 in Link<Idle*, void>::Call(Idle*) const include/tools/link.hxx:84:45
>     #34 0x2b711380dff9 in Idle::Invoke() vcl/source/app/idle.cxx:25:5
>     #35 0x2b711385011b in ImplSchedulerData::Invoke() vcl/source/app/scheduler.cxx:45:5
>     #36 0x2b71138535e5 in Scheduler::ProcessTaskScheduling(bool) vcl/source/app/scheduler.cxx:177:9
>     #37 0x2b71139a90d4 in ImplYield(bool, bool, unsigned long) vcl/source/app/svapp.cxx:521:5
>     #38 0x2b7113982d83 in Application::Yield() vcl/source/app/svapp.cxx:553:5
>     #39 0x2b7113982b1a in Application::Execute() vcl/source/app/svapp.cxx:473:9
>     #40 0x2b70df7a4294 in desktop::Desktop::DoExecute() desktop/source/app/app.cxx:1322:5
>     #41 0x2b70df7aeda3 in desktop::Desktop::Main() desktop/source/app/app.cxx:1647:17
>     #42 0x2b7113a0208e in ImplSVMain() vcl/source/app/svmain.cxx:172:19
>     #43 0x2b7113a0f776 in SVMain() vcl/source/app/svmain.cxx:210:16
>     #44 0x2b70df9e9d01 in soffice_main desktop/source/app/sofficemain.cxx:135:12
>     #45 0x4f0f0c in sal_main desktop/source/app/main.c:48:15
>     #46 0x4f0ee6 in main desktop/source/app/main.c:47:1
>     #47 0x2b70e137057f in __libc_start_main (/lib64/libc.so.6+0x2057f)
>     #48 0x418f48 in _start (instdir/program/soffice.bin+0x418f48)

Change-Id: I2bc4abe48c129e006582b9870229f44d2d2bb1ed

0 files changed, 0 insertions, 0 deletions