New ImageCache class for reusing Image resources.

1 files changed, 72 insertions, 0 deletions

diff --git a/plugingui/imagecache.h b/plugingui/imagecache.h
new file mode 100644
index 0000000..9ca28fb
--- /dev/null
+++ b/plugingui/imagecache.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            imagecache.h
+ *
+ *  Thu Jun  2 17:12:05 CEST 2016
+ *  Copyright 2016 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  DrumGizmo is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#pragma once
+
+#include <string>
+#include <map>
+#include <utility>
+
+namespace GUI
+{
+
+class Image;
+class ImageCache;
+
+class ScopedImageBorrower
+{
+public:
+	ScopedImageBorrower(ImageCache& imageCache, const std::string& filename);
+	ScopedImageBorrower(ScopedImageBorrower&& other);
+	~ScopedImageBorrower();
+
+	ScopedImageBorrower& operator=(ScopedImageBorrower&& other);
+
+	Image& operator*();
+	Image& operator()();
+
+private:
+	ImageCache& imageCache;
+	std::string filename;
+	Image& image;
+};
+
+class ImageCache
+{
+public:
+	ScopedImageBorrower getImage(const std::string& filename);
+
+private:
+	friend class ScopedImageBorrower;
+
+	Image& borrow(const std::string& filename);
+	void giveBack(const std::string& filename);
+
+protected:
+	std::map<std::string, std::pair<std::size_t, Image>> imageCache;
+};
+
+} // GUI::