Avoid more division by zero

Similar to <https://gerrit.libreoffice.org/c/core/+/151495> "Avoid division by
zero", CppunitTest_sw_ooxmlexport7 CPPUNIT_TEST_NAME=testFdo78957::TestBody
started to fail with

> drawinglayer/source/texture/texture.cxx:470:71: runtime error: division by zero
>  #0 in drawinglayer::texture::GeoTexSvxGradientRadial::appendTransformationsAndColors(std::function<void (basegfx::B2DHomMatrix const&, basegfx::BColor const&)>) at drawinglayer/source/texture/texture.cxx:470:71
>  #1 in drawinglayer::primitive2d::FillGradientPrimitive2D::generateMatricesAndColors(std::function<void (basegfx::B2DHomMatrix const&, basegfx::BColor const&)>) const at drawinglayer/source/primitive2d/fillgradientprimitive2d.cxx:99:31
>  #2 in drawinglayer::processor2d::VclPixelProcessor2D::processFillGradientPrimitive2D(drawinglayer::primitive2d::FillGradientPrimitive2D const&) at drawinglayer/source/processor2d/vclpixelprocessor2d.cxx:1017:24
>  #3 in drawinglayer::processor2d::VclPixelProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) at drawinglayer/source/processor2d/vclpixelprocessor2d.cxx:363:13
>  #4 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:68:21
>  #5 in drawinglayer::processor2d::VclProcessor2D::RenderMaskPrimitive2DPixel(drawinglayer::primitive2d::MaskPrimitive2D const&) at drawinglayer/source/processor2d/vclprocessor2d.cxx:866:9
>  #6 in drawinglayer::processor2d::VclPixelProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) at drawinglayer/source/processor2d/vclpixelprocessor2d.cxx:257:13
>  #7 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:68:21
>  #8 in drawinglayer::processor2d::BaseProcessor2D::visit(drawinglayer::primitive2d::Primitive2DContainer const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:56:13
>  #9 in drawinglayer::primitive2d::BufferedDecompositionPrimitive2D::get2DDecomposition(drawinglayer::primitive2d::Primitive2DDecompositionVisitor&, drawinglayer::geometry::ViewInformation2D const&) const at drawinglayer/source/primitive2d/BufferedDecompositionPrimitive2D.cxx:41:14
>  #10 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::BasePrimitive2D const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:46:24
>  #11 in drawinglayer::processor2d::VclPixelProcessor2D::processPolyPolygonGradientPrimitive2D(drawinglayer::primitive2d::PolyPolygonGradientPrimitive2D const&) at drawinglayer/source/processor2d/vclpixelprocessor2d.cxx:490:9
>  #12 in drawinglayer::processor2d::VclPixelProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) at drawinglayer/source/processor2d/vclpixelprocessor2d.cxx:232:13
>  #13 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:68:21
>  #14 in drawinglayer::processor2d::BaseProcessor2D::visit(drawinglayer::primitive2d::Primitive2DContainer const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:56:13
>  #15 in drawinglayer::primitive2d::BufferedDecompositionPrimitive2D::get2DDecomposition(drawinglayer::primitive2d::Primitive2DDecompositionVisitor&, drawinglayer::geometry::ViewInformation2D const&) const at drawinglayer/source/primitive2d/BufferedDecompositionPrimitive2D.cxx:41:14
>  #16 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::BasePrimitive2D const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:46:24
>  #17 in drawinglayer::processor2d::VclPixelProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) at drawinglayer/source/processor2d/vclpixelprocessor2d.cxx:378:13
>  #18 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:68:21
>  #19 in drawinglayer::processor2d::BaseProcessor2D::visit(drawinglayer::primitive2d::Primitive2DContainer const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:56:13
>  #20 in drawinglayer::primitive2d::BufferedDecompositionPrimitive2D::get2DDecomposition(drawinglayer::primitive2d::Primitive2DDecompositionVisitor&, drawinglayer::geometry::ViewInformation2D const&) const at drawinglayer/source/primitive2d/BufferedDecompositionPrimitive2D.cxx:41:14
>  #21 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::BasePrimitive2D const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:46:24
>  #22 in drawinglayer::processor2d::VclPixelProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) at drawinglayer/source/processor2d/vclpixelprocessor2d.cxx:378:13
>  #23 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:68:21
>  #24 in drawinglayer::processor2d::BaseProcessor2D::visit(drawinglayer::primitive2d::Primitive2DContainer const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:56:13
>  #25 in drawinglayer::primitive2d::GroupPrimitive2D::getChildren(drawinglayer::primitive2d::Primitive2DDecompositionVisitor&) const at include/drawinglayer/primitive2d/groupprimitive2d.hxx:76:90
>  #26 in drawinglayer::primitive2d::GroupPrimitive2D::get2DDecomposition(drawinglayer::primitive2d::Primitive2DDecompositionVisitor&, drawinglayer::geometry::ViewInformation2D const&) const at drawinglayer/source/primitive2d/groupprimitive2d.cxx:53:13
>  #27 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::BasePrimitive2D const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:46:24
>  #28 in drawinglayer::processor2d::VclPixelProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) at drawinglayer/source/processor2d/vclpixelprocessor2d.cxx:378:13
>  #29 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:68:21
>  #30 in drawinglayer::processor2d::VclProcessor2D::RenderTransformPrimitive2D(drawinglayer::primitive2d::TransformPrimitive2D const&) at drawinglayer/source/processor2d/vclprocessor2d.cxx:1004:5
>  #31 in drawinglayer::processor2d::VclPixelProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) at drawinglayer/source/processor2d/vclpixelprocessor2d.cxx:284:13
>  #32 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:68:21
>  #33 in drawinglayer::processor2d::VclProcessor2D::RenderTransformPrimitive2D(drawinglayer::primitive2d::TransformPrimitive2D const&) at drawinglayer/source/processor2d/vclprocessor2d.cxx:1004:5
>  #34 in drawinglayer::processor2d::VclPixelProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) at drawinglayer/source/processor2d/vclpixelprocessor2d.cxx:284:13
>  #35 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:68:21
>  #36 in drawinglayer::processor2d::VclProcessor2D::RenderTransformPrimitive2D(drawinglayer::primitive2d::TransformPrimitive2D const&) at drawinglayer/source/processor2d/vclprocessor2d.cxx:1004:5
>  #37 in drawinglayer::processor2d::VclPixelProcessor2D::processBasePrimitive2D(drawinglayer::primitive2d::BasePrimitive2D const&) at drawinglayer/source/processor2d/vclpixelprocessor2d.cxx:284:13
>  #38 in drawinglayer::processor2d::BaseProcessor2D::process(drawinglayer::primitive2d::Primitive2DContainer const&) at drawinglayer/source/processor2d/baseprocessor2d.cxx:68:21
>  #39 in drawinglayer::convertToBitmapEx(drawinglayer::primitive2d::Primitive2DContainer&&, drawinglayer::geometry::ViewInformation2D const&, unsigned int, unsigned int, unsigned int) at drawinglayer/source/tools/converters.cxx:217:24
>  #40 in drawinglayer::convertPrimitive2DContainerToBitmapEx(drawinglayer::primitive2d::Primitive2DContainer&&, basegfx::B2DRange const&, unsigned int, o3tl::Length, std::optional<Size> const&) at drawinglayer/source/tools/converters.cxx:332:28
>  #41 in SvxShape::GetBitmap(bool) const at svx/source/unodraw/unoshape.cxx:717:21
>  #42 in SvxShape::getPropertyValueImpl(rtl::OUString const&, SfxItemPropertyMapEntry const*, com::sun::star::uno::Any&) at svx/source/unodraw/unoshape.cxx:2597:18
>  #43 in SvxCustomShape::getPropertyValueImpl(rtl::OUString const&, SfxItemPropertyMapEntry const*, com::sun::star::uno::Any&) at svx/source/unodraw/unoshap2.cxx:1780:26
>  #44 in SvxShape::_getPropertyValue(rtl::OUString const&) at svx/source/unodraw/unoshape.cxx:1638:14
>  #45 in SvxShape::getPropertyValue(rtl::OUString const&) at svx/source/unodraw/unoshape.cxx:1622:16
>  #46 in non-virtual thunk to SvxShape::getPropertyValue(rtl::OUString const&) at svx/source/unodraw/unoshape.cxx
>  #47 in SwXShape::_getPropAtAggrObj(rtl::OUString const&) at sw/source/core/unocore/unodraw.cxx:1823:23
>  #48 in SwXShape::getPropertyValue(rtl::OUString const&) at sw/source/core/unocore/unodraw.cxx:1753:20
>  #49 in non-virtual thunk to SwXShape::getPropertyValue(rtl::OUString const&) at sw/source/core/unocore/unodraw.cxx
>  #50 in writerfilter::TagLogger::unoPropertySet(com::sun::star::uno::Reference<com::sun::star::beans::XPropertySet> const&) at writerfilter/source/dmapper/TagLogger.cxx:123:47
>  #51 in writerfilter::dmapper::DomainMapper_Impl::PushShapeContext(com::sun::star::uno::Reference<com::sun::star::drawing::XShape> const&) at writerfilter/source/dmapper/DomainMapper_Impl.cxx:4204:38
>  #52 in writerfilter::dmapper::DomainMapper::lcl_startShape(com::sun::star::uno::Reference<com::sun::star::drawing::XShape> const&) at writerfilter/source/dmapper/DomainMapper.cxx:3680:18
>  #53 in writerfilter::LoggedStream::startShape(com::sun::star::uno::Reference<com::sun::star::drawing::XShape> const&) at writerfilter/source/dmapper/LoggedResources.cxx:139:5
>  #54 in writerfilter::ooxml::OOXMLFastContextHandlerShape::sendShape(int) at writerfilter/source/ooxml/OOXMLFastContextHandler.cxx:1810:19
>  #55 in writerfilter::ooxml::OOXMLFastContextHandlerShape::lcl_endFastElement(int) at writerfilter/source/ooxml/OOXMLFastContextHandler.cxx:1829:9
>  #56 in writerfilter::ooxml::OOXMLFastContextHandler::endFastElement(int) at writerfilter/source/ooxml/OOXMLFastContextHandler.cxx:223:9
>  #57 in (anonymous namespace)::Entity::endElement() at sax/source/fastparser/fastparser.cxx:515:27
>  #58 in sax_fastparser::FastSaxParserImpl::callbackEndElement() at sax/source/fastparser/fastparser.cxx:1330:17
>  #59 in (anonymous namespace)::call_callbackEndElement(void*, unsigned char const*, unsigned char const*, unsigned char const*) at sax/source/fastparser/fastparser.cxx:339:18
>  #60 in xmlParseEndTag2 at workdir/UnpackedTarball/libxml2/parser.c:9742:2
>  #61 in xmlParseTryOrFinish at workdir/UnpackedTarball/libxml2/parser.c:11642:14
>  #62 in xmlParseChunk at workdir/UnpackedTarball/libxml2/parser.c:12351:13
>  #63 in sax_fastparser::FastSaxParserImpl::parse() at sax/source/fastparser/fastparser.cxx:1111:25
>  #64 in sax_fastparser::FastSaxParserImpl::parseStream(com::sun::star::xml::sax::InputSource const&) at sax/source/fastparser/fastparser.cxx:891:9
>  #65 in sax_fastparser::FastSaxParser::parseStream(com::sun::star::xml::sax::InputSource const&) at sax/source/fastparser/fastparser.cxx:1469:13
>  #66 in writerfilter::ooxml::OOXMLDocumentImpl::resolve(writerfilter::Stream&) at writerfilter/source/ooxml/OOXMLDocumentImpl.cxx:515:18
>  #67 in writerfilter::dmapper::DomainMapper_Impl::substream(unsigned int, tools::SvRef<writerfilter::Reference<writerfilter::Stream>> const&) at writerfilter/source/dmapper/DomainMapper_Impl.cxx:9143:14
>  #68 in writerfilter::dmapper::DomainMapper::lcl_substream(unsigned int, tools::SvRef<writerfilter::Reference<writerfilter::Stream>>) at writerfilter/source/dmapper/DomainMapper.cxx:4390:14
>  #69 in writerfilter::LoggedStream::substream(unsigned int, tools::SvRef<writerfilter::Reference<writerfilter::Stream>>) at writerfilter/source/dmapper/LoggedResources.cxx:272:5
>  #70 in writerfilter::ooxml::OOXMLDocumentImpl::resolveFastSubStreamWithId(writerfilter::Stream&, tools::SvRef<writerfilter::Reference<writerfilter::Stream>> const&, unsigned int) at writerfilter/source/ooxml/OOXMLDocumentImpl.cxx:126:13
>  #71 in writerfilter::ooxml::OOXMLDocumentImpl::resolveHeader(writerfilter::Stream&, int, rtl::OUString const&) at writerfilter/source/ooxml/OOXMLDocumentImpl.cxx:385:10
>  #72 in writerfilter::ooxml::OOXMLFastContextHandler::resolveHeader(int, rtl::OUString const&) at writerfilter/source/ooxml/OOXMLFastContextHandler.cxx:888:35
>  #73 in writerfilter::ooxml::OOXMLHeaderHandler::finalize() at writerfilter/source/ooxml/Handler.cxx:214:20
>  #74 in writerfilter::ooxml::OOXMLFastContextHandlerProperties::handleHdrFtr() at writerfilter/source/ooxml/OOXMLFastContextHandler.cxx:1113:28
>  #75 in writerfilter::ooxml::OOXMLFactory_wml::endAction(writerfilter::ooxml::OOXMLFastContextHandler*) at workdir/CustomTarget/writerfilter/source/ooxml/OOXMLFactory_wml.cxx:7482:26
>  #76 in writerfilter::ooxml::OOXMLFactory::endAction(writerfilter::ooxml::OOXMLFastContextHandler*) at writerfilter/source/ooxml/OOXMLFactory.cxx:157:19
>  #77 in writerfilter::ooxml::OOXMLFastContextHandler::endAction() at writerfilter/source/ooxml/OOXMLFastContextHandler.cxx:316:5
>  #78 in writerfilter::ooxml::OOXMLFastContextHandlerProperties::lcl_endFastElement(int) at writerfilter/source/ooxml/OOXMLFastContextHandler.cxx:1034:9
>  #79 in writerfilter::ooxml::OOXMLFastContextHandler::endFastElement(int) at writerfilter/source/ooxml/OOXMLFastContextHandler.cxx:223:9
>  #80 in (anonymous namespace)::Entity::endElement() at sax/source/fastparser/fastparser.cxx:515:27
>  #81 in sax_fastparser::FastSaxParserImpl::callbackEndElement() at sax/source/fastparser/fastparser.cxx:1330:17
>  #82 in (anonymous namespace)::call_callbackEndElement(void*, unsigned char const*, unsigned char const*, unsigned char const*) at sax/source/fastparser/fastparser.cxx:339:18
>  #83 in xmlParseTryOrFinish at workdir/UnpackedTarball/libxml2/parser.c:11493:8
>  #84 in xmlParseChunk at workdir/UnpackedTarball/libxml2/parser.c:12351:13
>  #85 in sax_fastparser::FastSaxParserImpl::parse() at sax/source/fastparser/fastparser.cxx:1086:21
>  #86 in sax_fastparser::FastSaxParserImpl::parseStream(com::sun::star::xml::sax::InputSource const&) at sax/source/fastparser/fastparser.cxx:891:9
>  #87 in sax_fastparser::FastSaxParser::parseStream(com::sun::star::xml::sax::InputSource const&) at sax/source/fastparser/fastparser.cxx:1469:13
>  #88 in writerfilter::ooxml::OOXMLDocumentImpl::resolve(writerfilter::Stream&) at writerfilter/source/ooxml/OOXMLDocumentImpl.cxx:515:18
>  #89 in (anonymous namespace)::WriterFilter::filter(com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at writerfilter/source/filter/WriterFilter.cxx:208:24
>  #90 in SfxObjectShell::ImportFrom(SfxMedium&, com::sun::star::uno::Reference<com::sun::star::text::XTextRange> const&) at sfx2/source/doc/objstor.cxx:2272:34
>  #91 in SfxObjectShell::DoLoad(SfxMedium*) at sfx2/source/doc/objstor.cxx:739:23
>  #92 in SfxBaseModel::load(com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at sfx2/source/doc/sfxbasemodel.cxx:1940:36
>  #93 in (anonymous namespace)::SfxFrameLoader_Impl::load(com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&, com::sun::star::uno::Reference<com::sun::star::frame::XFrame> const&) at sfx2/source/view/frmload.cxx:720:28
>  #94 in framework::LoadEnv::impl_loadContent() at framework/source/loadenv/loadenv.cxx:1176:37
>  #95 in framework::LoadEnv::start() at framework/source/loadenv/loadenv.cxx:412:20
>  #96 in framework::LoadEnv::startLoading(rtl::OUString const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&, com::sun::star::uno::Reference<com::sun::star::frame::XFrame> const&, rtl::OUString const&, int, LoadEnvFeatures) at framework/source/loadenv/loadenv.cxx:308:5
>  #97 in framework::LoadEnv::loadComponentFromURL(com::sun::star::uno::Reference<com::sun::star::frame::XComponentLoader> const&, com::sun::star::uno::Reference<com::sun::star::uno::XComponentContext> const&, rtl::OUString const&, rtl::OUString const&, int, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at framework/source/loadenv/loadenv.cxx:168:14
>  #98 in framework::Desktop::loadComponentFromURL(rtl::OUString const&, rtl::OUString const&, int, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at framework/source/services/desktop.cxx:593:16
>  #99 in non-virtual thunk to framework::Desktop::loadComponentFromURL(rtl::OUString const&, rtl::OUString const&, int, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at framework/source/services/desktop.cxx
>  #100 in unotest::MacrosTest::loadFromDesktop(rtl::OUString const&, rtl::OUString const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) at unotest/source/cpp/macros_test.cxx:71:62
>  #101 in UnoApiTest::load(rtl::OUString const&, char const*) at test/source/unoapi_test.cxx:115:11
>  #102 in SwModelTestBase::loadURL(rtl::OUString const&, char const*, char const*) at sw/qa/unit/swmodeltestbase.cxx:470:20
>  #103 in SwModelTestBase::load(char const*, char const*) at sw/qa/inc/swmodeltestbase.hxx:353:16
>  #104 in SwModelTestBase::loadAndSave(char const*) at sw/qa/unit/swmodeltestbase.cxx:523:5
>  #105 in testFdo78957::TestBody() at sw/qa/extras/ooxmlexport/ooxmlexport7.cxx:783:5

Change-Id: Ifbc7da0b6c971df61e9908cc02b10a9f50769fcf
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/151496
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drawinglayer/source/texture/texture.cxx b/drawinglayer/source/texture/texture.cxx
index 648359931bd0..aeeb5b61bb05 100644
--- a/drawinglayer/source/texture/texture.cxx
+++ b/drawinglayer/source/texture/texture.cxx
@@ -467,7 +467,11 @@ namespace drawinglayer::texture
                     // set and add at target
                     aCallback(
                         maGradientInfo.getTextureTransform() * basegfx::utils::createScaleB2DHomMatrix(fSize, fSize),
-                        interpolate(aCStart, aCEnd, double(innerLoop) / double(nSteps - 1)));
+                        interpolate(
+                            aCStart, aCEnd,
+                            nSteps == 1
+                                ? std::numeric_limits<double>::infinity()
+                                : double(innerLoop) / double(nSteps - 1)));
                 }
             }