SVGIO: tdf#97539: clip-path elements might contain...

reference to other clip-paths

Change-Id: I3722b31cefa4df6225e369b3d1db9f46be5933ff
Reviewed-on: https://gerrit.libreoffice.org/22956Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Xisco Faulí <anistenis@gmail.com>

svgio/inc/svgio/svgreader/svgstyleattributes.hxx

@@ -32,6 +32,7 @@ namespace svgio { namespace svgreader {
     class SvgGradientNode;
     class SvgPatternNode;
     class SvgMarkerNode;
+    class SvgClipPathNode;
 }}
 
 
@@ -215,6 +216,7 @@ namespace svgio
 
             /// link to content. If set, the node can be fetched on demand
             OUString               maClipPathXLink;
+            const SvgClipPathNode* mpClipPathXLink;
             OUString               maMaskXLink;
 
             /// link to markers. If set, the node can be fetched on demand
@@ -441,7 +443,8 @@ namespace svgio
             void setDesc(const OUString& rNew) { maDesc = rNew; }
 
             // ClipPathXLink content
-            const OUString getClipPathXLink() const { return maClipPathXLink; }
+            OUString getClipPathXLink() const;
+            const SvgClipPathNode* accessClipPathXLink() const;
 
             // MaskXLink content
             const OUString getMaskXLink() const { return maMaskXLink; }

svgio/source/svgreader/svgstyleattributes.cxx

@@ -1145,17 +1145,12 @@ namespace svgio
                     aSource = drawinglayer::primitive2d::Primitive2DContainer { xRef };
                 }
 
-                if(!getClipPathXLink().isEmpty())
-                {
-                    // try to access linked ClipPath
-                    const SvgClipPathNode* mpClip = dynamic_cast< const SvgClipPathNode* >(mrOwner.getDocument().findSvgNodeById(getClipPathXLink()));
-
+                const SvgClipPathNode* mpClip = accessClipPathXLink();
                 if(mpClip)
                 {
                     // #i124852# transform may be needed when userSpaceOnUse
                     mpClip->apply(aSource, pTransform);
                 }
-                }
 
                 if(!aSource.empty()) // test again, applied clipPath may have lead to empty geometry
                 {
@@ -1215,6 +1210,7 @@ namespace svgio
             maTitle(),
             maDesc(),
             maClipPathXLink(),
+            mpClipPathXLink(nullptr),
             maMaskXLink(),
             maMarkerStartXLink(),
             mpMarkerStartXLink(nullptr),
@@ -2659,6 +2655,38 @@ namespace svgio
             return nullptr;
         }
 
+        OUString SvgStyleAttributes::getClipPathXLink() const
+        {
+            if(!maClipPathXLink.isEmpty())
+            {
+                return maClipPathXLink;
+            }
+
+            const SvgStyleAttributes* pSvgStyleAttributes = getParentStyle();
+
+            if(pSvgStyleAttributes && !pSvgStyleAttributes->maClipPathXLink.isEmpty())
+            {
+                return pSvgStyleAttributes->getClipPathXLink();
+            }
+
+            return OUString();
+        }
+
+        const SvgClipPathNode* SvgStyleAttributes::accessClipPathXLink() const
+        {
+            if(!mpClipPathXLink)
+            {
+                const OUString aClipPath(getClipPathXLink());
+
+                if(!aClipPath.isEmpty())
+                {
+                    const_cast< SvgStyleAttributes* >(this)->mpClipPathXLink = dynamic_cast< const SvgClipPathNode* >(mrOwner.getDocument().findSvgNodeById(getClipPathXLink()));
+                }
+            }
+
+            return mpClipPathXLink;
+        }
+
         OUString SvgStyleAttributes::getMarkerStartXLink() const
         {
             if(!maMarkerStartXLink.isEmpty())