Add an explicit FlushDrawing method to Surface that should be called after

completing a bitmap. Currently only has a real implementation on Direct2D.
Avoiding implicit flushes inside Copy and FillRectangle produced a 23% speed
improvement on files with about 1 indentation guide per line as the drawing
pipeline was being flushed for each indentation guide.

1 files changed, 4 insertions, 0 deletions

diff --git a/gtk/PlatGTK.cxx b/gtk/PlatGTK.cxx
index 3b19df3ba..3f0918886 100755
--- a/gtk/PlatGTK.cxx
+++ b/gtk/PlatGTK.cxx
@@ -189,6 +189,7 @@ public:
 	void SetClip(PRectangle rc) override;
 	void PopClip() override;
 	void FlushCachedState() override;
+	void FlushDrawing() override;
 
 	void SetUnicodeMode(bool unicodeMode_) override;
 	void SetDBCSMode(int codePage) override;
@@ -981,6 +982,9 @@ void SurfaceImpl::SetDBCSMode(int codePage) {
 void SurfaceImpl::SetBidiR2L(bool) {
 }
 
+void SurfaceImpl::FlushDrawing() {
+}
+
 std::unique_ptr<Surface> Surface::Allocate(int) {
 	return std::make_unique<SurfaceImpl>();
 }