perf: eliminate SfxSimpleHint and move to SfxHint, tdf#87101 related

There were over 150 places in *::Notify() functions that did some
dynamic_cast<SfxSimpleHint*> of which ~98% were unnecessary because the
base class SfxHint passed was an SfxSimpleHint anyway. dynamic_cast
operations come with quite some cost, so avoid if possible. Specifically
for ScFormulaCell::Notify() that created a bottleneck in scenarios where
cells were notified that already handled a previous notification. In
mass operations doing the dynamic_cast before it could be decided
whether having to act on it or not this made 2/3 of all time spent in
the Notify() call.

To get rid of that rename/move SfxSimpleHint to SfxHint and let classes
derive from SfxHint instead of SfxSimpleHint. This comes only with a
slight cost that an additional sal_uInt32 is transported in such hints,
initialized to 0, but this is neglectable compared to the huge gain.

For the rare cases where a Notify() actually expects both, an SfxHint
(formerly SfxSimpleHint) and a derived hint, this changed order of the
dynamic_cast involved so the simple SfxHint::GetId() is handled last.
Modules using such combinations can further optimize by treating the
simple SfxHint::GetId() first once verified that none of the other
derived hints use an ID not equal to zero respectively none of the ID
values the simple hint uses.

Change-Id: I9fcf723e3a4487ceb92336189d23a62c344cf0ce
Reviewed-on: https://gerrit.libreoffice.org/29205
Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>

1 files changed, 4 insertions, 5 deletions

diff --git a/svx/source/svdraw/svdoedge.cxx b/svx/source/svdraw/svdoedge.cxx
index db40a25c2477..7b5ce5678631 100644
--- a/svx/source/svdraw/svdoedge.cxx
+++ b/svx/source/svdraw/svdoedge.cxx
@@ -25,7 +25,7 @@
 #include <basegfx/polygon/b2dpolygon.hxx>
 #include <basegfx/polygon/b2dpolygontools.hxx>
 #include <editeng/eeitem.hxx>
-#include <svl/smplhint.hxx>
+#include <svl/hint.hxx>
 #include <svl/style.hxx>
 
 #include <sdr/contact/viewcontactofsdredgeobj.hxx>
@@ -1559,8 +1559,7 @@ line (CL). The number of object margins per object varies between 0 and 3:
 
 void SdrEdgeObj::Notify(SfxBroadcaster& rBC, const SfxHint& rHint)
 {
-    const SfxSimpleHint* pSimple = dynamic_cast<const SfxSimpleHint*>(&rHint);
-    const sal_uInt32 nId = pSimple==nullptr ? 0 : pSimple->GetId();
+    const sal_uInt32 nId = rHint.GetId();
     bool bDataChg=nId==SFX_HINT_DATACHANGED;
     bool bDying=nId==SFX_HINT_DYING;
     bool bObj1=aCon1.pObj!=nullptr && aCon1.pObj->GetBroadcaster()==&rBC;
@@ -1608,13 +1607,13 @@ void SdrEdgeObj::Reformat()
 {
     if( nullptr != aCon1.pObj )
     {
-        SfxSimpleHint aHint( SFX_HINT_DATACHANGED );
+        SfxHint aHint( SFX_HINT_DATACHANGED );
         Notify( *const_cast<SfxBroadcaster*>(aCon1.pObj->GetBroadcaster()), aHint );
     }
 
     if( nullptr != aCon2.pObj )
     {
-        SfxSimpleHint aHint( SFX_HINT_DATACHANGED );
+        SfxHint aHint( SFX_HINT_DATACHANGED );
         Notify( *const_cast<SfxBroadcaster*>(aCon2.pObj->GetBroadcaster()), aHint );
     }
 }