From 31affcdb468a3f0fb8a01046060a19581a86c374 Mon Sep 17 00:00:00 2001
From: cxl <cxl@f0d560ea-af0d-0410-9eb7-867de7ffcac7>
Date: Sat, 23 Feb 2019 15:28:18 +0000
Subject: [PATCH] CtrlCore: Improved Image cache behaviour in Win32

git-svn-id: svn://ultimatepp.org/upp/trunk@12788 f0d560ea-af0d-0410-9eb7-867de7ffcac7
---
 uppsrc/CtrlCore/ImageWin32.cpp | 6 ++++++
 uppsrc/Draw/Image.h            | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/uppsrc/CtrlCore/ImageWin32.cpp b/uppsrc/CtrlCore/ImageWin32.cpp
index 20ad00f82..601f63d43 100644
--- a/uppsrc/CtrlCore/ImageWin32.cpp
+++ b/uppsrc/CtrlCore/ImageWin32.cpp
@@ -339,6 +339,12 @@ void SystemDraw::SysDrawImageOp(int x, int y, const Image& img, const Rect& src,
 	LLOG("SysDrawImageOp " << img.GetSerialId() << ' ' << img.GetSize());
 	ImageSysDataMaker m;
 	static LRUCache<ImageSysData, int64> cache;
+	static int Rsz;
+	Rsz += img.GetLength();
+	if(Rsz > 200 * 200) { // we do not want to do this for each small image painted...
+		Rsz = 0;
+		cache.Remove([](const ImageSysData& object) { return object.img.GetRefCount() == 1; });
+	}
 	LLOG("SysImage cache pixels " << cache.GetSize() << ", count " << cache.GetCount());
 	Size sz = Ctrl::GetPrimaryScreenArea().GetSize();
 	m.img = IsPrinter() && GetDeviceCaps(GetHandle(), NUMCOLORS) == 2 ? Dither(img, 360) : img; // If printer does not support color, dither
diff --git a/uppsrc/Draw/Image.h b/uppsrc/Draw/Image.h
index a18f57edf..b4150bd3a 100644
--- a/uppsrc/Draw/Image.h
+++ b/uppsrc/Draw/Image.h
@@ -253,6 +253,10 @@ public:
 		char info[24];
 	};
 	explicit Image(const Init& init);
+	
+	// required by system image cache managemenent
+	
+	int GetRefCount() const         { return data->refcount; }
 };
 
 Image Premultiply(const Image& img);