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authorBent Bisballe Nyeng <deva@aasimon.org>2020-12-29 16:09:43 +0100
committerBent Bisballe Nyeng <deva@aasimon.org>2020-12-29 16:39:54 +0100
commit645250e1cd8ce9bc1faea599df7a1b05836bfeb8 (patch)
treec6311afab3900d2dd2aecbfbe1ac348d0e48c428 /dggui/imagecache.cc
parentdce64999d3325c5b55499d6ba657066efa48fbff (diff)
Split UI code into application/plugin UI and UI library.
Diffstat (limited to 'dggui/imagecache.cc')
-rw-r--r--dggui/imagecache.cc103
1 files changed, 103 insertions, 0 deletions
diff --git a/dggui/imagecache.cc b/dggui/imagecache.cc
new file mode 100644
index 0000000..d3130fe
--- /dev/null
+++ b/dggui/imagecache.cc
@@ -0,0 +1,103 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * imagecache.cc
+ *
+ * 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.
+ */
+#include "imagecache.h"
+
+#include <cassert>
+
+#include "image.h"
+
+namespace GUI
+{
+
+ScopedImageBorrower::ScopedImageBorrower(ImageCache& imageCache,
+ const std::string& filename)
+ : imageCache(imageCache)
+ , filename(filename)
+ , image(imageCache.borrow(filename))
+{
+}
+
+ScopedImageBorrower::ScopedImageBorrower(ScopedImageBorrower&& other)
+ : imageCache(other.imageCache)
+ , filename(other.filename)
+ , image(other.image)
+{
+ other.filename.clear();
+}
+
+ScopedImageBorrower::~ScopedImageBorrower()
+{
+ if(!filename.empty())
+ {
+ imageCache.giveBack(filename);
+ }
+}
+
+Image& ScopedImageBorrower::operator*()
+{
+ return image;
+}
+
+Image& ScopedImageBorrower::operator()()
+{
+ return image;
+}
+
+ScopedImageBorrower ImageCache::getImage(const std::string& filename)
+{
+ return ScopedImageBorrower(*this, filename);
+}
+
+Image& ImageCache::borrow(const std::string& filename)
+{
+ auto cacheIterator = imageCache.find(filename);
+ if(cacheIterator == imageCache.end())
+ {
+ Image image(filename);
+ auto insertValue =
+ imageCache.emplace(filename, std::make_pair(0, std::move(image)));
+ cacheIterator = insertValue.first;
+ }
+
+ auto& cacheEntry = cacheIterator->second;
+ ++cacheEntry.first;
+ return cacheEntry.second;
+}
+
+void ImageCache::giveBack(const std::string& filename)
+{
+ auto cacheIterator = imageCache.find(filename);
+ assert(cacheIterator != imageCache.end());
+ auto& cacheEntry = cacheIterator->second;
+ --cacheEntry.first;
+ if(cacheEntry.first == 0)
+ {
+ imageCache.erase(cacheIterator);
+ }
+}
+
+} // GUI::