Support buffering SystemDependent GraphicData

Started to make the buffering more flexible by adding
virtual methods

virtual sal_uInt32 getHoldCyclesInSeconds() const;
virtual sal_Int64 estimateUsageInBytes() const;

to class SystemDependentData. This will allow to add more
sensitive buffering/caching.
Also fine-tuned Linux-derived classes actively used for buffering
to be more sensitive when and where to reuse the buffered data

Change-Id: Ifc69c318ade0209aff071d76001869d9f4eeb10d
Reviewed-on: https://gerrit.libreoffice.org/60881
Tested-by: Jenkins
Reviewed-by: Armin Le Grand <Armin.Le.Grand@cib.de>

1 files changed, 14 insertions, 4 deletions

diff --git a/basegfx/source/tools/systemdependentdata.cxx b/basegfx/source/tools/systemdependentdata.cxx
index 45f2efba5012..4153d35f7d55 100644
--- a/basegfx/source/tools/systemdependentdata.cxx
+++ b/basegfx/source/tools/systemdependentdata.cxx
@@ -61,16 +61,26 @@ namespace basegfx
 namespace basegfx
 {
     SystemDependentData::SystemDependentData(
-        SystemDependentDataManager& rSystemDependentDataManager,
-        sal_uInt32 nHoldCycles)
-    :   mrSystemDependentDataManager(rSystemDependentDataManager),
-        mnHoldCycles(nHoldCycles)
+        SystemDependentDataManager& rSystemDependentDataManager)
+    :   mrSystemDependentDataManager(rSystemDependentDataManager)
     {
     }
 
     SystemDependentData::~SystemDependentData()
     {
     }
+
+    sal_uInt32 SystemDependentData::getHoldCyclesInSeconds() const
+    {
+        // default implementation returns 60(s)
+        return 60;
+    }
+
+    sal_Int64 SystemDependentData::estimateUsageInBytes() const
+    {
+        // default implementation has no idea
+        return 0;
+    }
 } // namespace basegfx
 
 namespace basegfx