reduce explicit Skia flushing

The docs say that Skia handles this itself, and with Vulkan excessive
flushing may show up in profiling in some cases, as it's apparently
a non-trivial operation in GPU mode. Remove even the two workarounds,
I cannot reproduce the problems anymore, so let's assume it's been
fixed in Skia.
But still keep the flushing after a certain number of operations,
as too many pending operations still may overload Skia (or Vulkan?),
besides tdf#136369 I can also reproduce it while loading bsc#1183308
which does a large number of tiny VirtualDevice's and does GetBitmap()
on them.
Also change the counter to be global, as we use just one Skia drawing
context.

Change-Id: I48b96c2a59f8e1eeef3da154dbe373a37857c4be
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/128293
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/vcl/inc/skia/gdiimpl.hxx b/vcl/inc/skia/gdiimpl.hxx
index b5144a249207..b2814b2a6463 100644
--- a/vcl/inc/skia/gdiimpl.hxx
+++ b/vcl/inc/skia/gdiimpl.hxx
@@ -368,7 +368,7 @@ protected:
         double transparency;
     };
     LastPolyPolygonInfo mLastPolyPolygonInfo;
-    int mPendingOperationsToFlush;
+    inline static int pendingOperationsToFlush = 0;
     int mScaling; // The scale factor for HiDPI screens.
 };