Fix undefined behavior caused by a null clip path element #209

Author: sammycage

source/svgelement.cpp

@@ -1041,7 +1041,7 @@ void SVGClipPathElement::applyClipPath(SVGRenderState& state) const
             shapeElement = toSVGGeometryElement(element->firstChild());
         }
 
-        if(shapeElement == nullptr || shapeElement->isDisplayNone() || shapeElement->isVisibilityHidden())
+        if(shapeElement == nullptr || !shapeElement->isRenderable())
             continue;
         state->clipPath(shapeElement->path(), shapeElement->clip_rule(), clipTransform * shapeElement->localTransform());
         return;
@@ -1070,7 +1070,7 @@ bool SVGClipPathElement::requiresMasking() const
             shapeElement = toSVGGeometryElement(element->firstChild());
         }
 
-        if(shapeElement == nullptr || shapeElement->isDisplayNone() || shapeElement->isVisibilityHidden())
+        if(shapeElement == nullptr || !shapeElement->isRenderable())
             continue;
         if(prevShapeElement || shapeElement->clipper())
             return true;

source/svggeometryelement.cpp

@@ -138,7 +138,7 @@ void SVGGeometryElement::updateMarkerPositions(SVGMarkerPositionList& positions,
 
 void SVGGeometryElement::render(SVGRenderState& state) const
 {
-    if(m_path.isNull() || isVisibilityHidden() || isDisplayNone())
+    if(!isRenderable())
         return;
     SVGBlendInfo blendInfo(this);
     SVGRenderState newState(this, state, localTransform());

source/svggeometryelement.h

@@ -36,6 +36,8 @@ class SVGGeometryElement : public SVGGraphicsElement {
     Rect strokeBoundingBox() const override;
     void layoutElement(const SVGLayoutState& state) override;
 
+    bool isRenderable() const { return !m_path.isNull() && !isDisplayNone() && !isVisibilityHidden(); }
+
     FillRule fill_rule() const { return m_fill_rule; }
     FillRule clip_rule() const { return m_clip_rule; }