tdf#130326 related, speed up drawing

if we create the list every time we call
    ViewContact::getViewIndependentPrimitive2DContainer
then caching the result is rather worthless.
So make the caching worthwhile, which means invalidating
it when something changes.

Change-Id: I081e9501255ec1c87454bfcc1e0a741109afa99f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/113891
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
(cherry picked from commit 44711d9eb53eb6247ebdb9293a3eb5e643f78059)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/114505

2 files changed, 19 insertions, 14 deletions

diff --git a/include/svx/sdr/contact/viewcontact.hxx b/include/svx/sdr/contact/viewcontact.hxx
index c5cc61883a49..d5603790ffd0 100644
--- a/include/svx/sdr/contact/viewcontact.hxx
+++ b/include/svx/sdr/contact/viewcontact.hxx
@@ -49,7 +49,8 @@ private:
     // Primitive2DContainer of the ViewContact. This contains all necessary information
     // for the graphical visualisation and needs to be supported by all VCs which
     // can be visualized.
-    drawinglayer::primitive2d::Primitive2DContainer mxViewIndependentPrimitive2DSequence;
+    mutable drawinglayer::primitive2d::Primitive2DContainer mxViewIndependentPrimitive2DSequence;
+    mutable bool mbNeedToCreatePrimitives;
 
     // A new ViewObjectContact was created and shall be remembered.
     void AddViewObjectContact(ViewObjectContact& rVOContact);
diff --git a/svx/source/sdr/contact/viewcontact.cxx b/svx/source/sdr/contact/viewcontact.cxx
index 8e8d35db4406..75c40cfb2cc4 100644
--- a/svx/source/sdr/contact/viewcontact.cxx
+++ b/svx/source/sdr/contact/viewcontact.cxx
@@ -39,6 +39,7 @@ ViewObjectContact& ViewContact::CreateObjectSpecificViewObjectContact(ObjectCont
 ViewContact::ViewContact()
     : maViewObjectContactVector()
     , mxViewIndependentPrimitive2DSequence()
+    , mbNeedToCreatePrimitives(true)
 {
 }
 
@@ -61,6 +62,7 @@ void ViewContact::deleteAllVOCs()
 
     // assert when there were new entries added during deletion
     DBG_ASSERT(maViewObjectContactVector.empty(), "Corrupted ViewObjectContactList in VC (!)");
+    mbNeedToCreatePrimitives = true;
 }
 
 // get an Object-specific ViewObjectContact for a specific
@@ -96,6 +98,7 @@ ViewObjectContact& ViewContact::GetViewObjectContact(ObjectContact& rObjectConta
 void ViewContact::AddViewObjectContact(ViewObjectContact& rVOContact)
 {
     maViewObjectContactVector.push_back(&rVOContact);
+    mbNeedToCreatePrimitives = true;
 }
 
 // A ViewObjectContact was deleted and shall be forgotten.
@@ -107,6 +110,7 @@ void ViewContact::RemoveViewObjectContact(ViewObjectContact& rVOContact)
     if (aFindResult != maViewObjectContactVector.end())
     {
         maViewObjectContactVector.erase(aFindResult);
+        mbNeedToCreatePrimitives = true;
     }
 }
 
@@ -182,6 +186,7 @@ void ViewContact::ActionChildInserted(ViewContact& rChild)
         // rectangle will be invalidated at the associated OutputDevice.
         pCandidate->ActionChildInserted(rChild);
     }
+    mbNeedToCreatePrimitives = true;
 }
 
 // React on changes of the object of this ViewContact
@@ -199,6 +204,7 @@ void ViewContact::ActionChanged()
 
         pCandidate->ActionChanged();
     }
+    mbNeedToCreatePrimitives = true;
 }
 
 // access to SdrObject and/or SdrPage. May return 0L like the default
@@ -229,22 +235,20 @@ ViewContact::createViewIndependentPrimitive2DSequence() const
 drawinglayer::primitive2d::Primitive2DContainer const&
 ViewContact::getViewIndependentPrimitive2DContainer() const
 {
-    // local up-to-date checks. Create new list and compare.
-    drawinglayer::primitive2d::Primitive2DContainer xNew(
-        createViewIndependentPrimitive2DSequence());
-
-    if (!xNew.empty())
+    if (mbNeedToCreatePrimitives)
     {
-        // allow evtl. embedding in object-specific infos, e.g. Name, Title, Description
-        xNew = embedToObjectSpecificInformation(std::move(xNew));
-    }
+        drawinglayer::primitive2d::Primitive2DContainer xNew(
+            createViewIndependentPrimitive2DSequence());
 
-    if (mxViewIndependentPrimitive2DSequence != xNew)
-    {
-        // has changed, copy content
-        const_cast<ViewContact*>(this)->mxViewIndependentPrimitive2DSequence = std::move(xNew);
-    }
+        if (!xNew.empty())
+        {
+            // allow evtl. embedding in object-specific infos, e.g. Name, Title, Description
+            xNew = embedToObjectSpecificInformation(std::move(xNew));
+        }
 
+        mxViewIndependentPrimitive2DSequence = std::move(xNew);
+        mbNeedToCreatePrimitives = false;
+    }
     // return current Primitive2DContainer
     return mxViewIndependentPrimitive2DSequence;
 }