From ab7ab9e52ab87963831f90ab25957d883878654d Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Thu, 2 Jun 2016 21:00:37 +0200
Subject: New ImageCache class for reusing Image resources.
---
plugingui/Makefile.mingw32 | 1 +
plugingui/image.cc | 32 +++++++++++++-
plugingui/image.h | 11 +++--
plugingui/imagecache.cc | 104 +++++++++++++++++++++++++++++++++++++++++++++
plugingui/imagecache.h | 72 +++++++++++++++++++++++++++++++
5 files changed, 216 insertions(+), 4 deletions(-)
create mode 100644 plugingui/imagecache.cc
create mode 100644 plugingui/imagecache.h
(limited to 'plugingui')
diff --git a/plugingui/Makefile.mingw32 b/plugingui/Makefile.mingw32
index 9820d1a..98d8f29 100644
--- a/plugingui/Makefile.mingw32
+++ b/plugingui/Makefile.mingw32
@@ -35,6 +35,7 @@ GUI_SRC = \
filebrowser.cc \
directory.cc \
image.cc \
+ imagecache.cc \
combobox.cc \
progressbar.cc \
verticalline.cc \
diff --git a/plugingui/image.cc b/plugingui/image.cc
index 250dc60..63f708d 100644
--- a/plugingui/image.cc
+++ b/plugingui/image.cc
@@ -48,9 +48,39 @@ Image::Image(const std::string& filename)
load(rc.data(), rc.size());
}
+Image::Image(Image&& other)
+ : _width(other._width)
+ , _height(other._height)
+ , image_data(other.image_data)
+{
+ other.image_data = nullptr;
+ other._width = 0;
+ other._height = 0;
+}
+
Image::~Image()
{
- std::free(image_data);
+ if(image_data)
+ {
+ std::free(image_data);
+ }
+}
+
+Image& Image::operator=(Image&& other)
+{
+ if(image_data)
+ {
+ std::free(image_data);
+ }
+ image_data = other.image_data;
+ _width = other._width;
+ _height = other._height;
+
+ other.image_data = nullptr;
+ other._width = 0;
+ other._height = 0;
+
+ return *this;
}
void Image::setError()
diff --git a/plugingui/image.h b/plugingui/image.h
index 92bd181..8d1fd59 100644
--- a/plugingui/image.h
+++ b/plugingui/image.h
@@ -33,12 +33,16 @@
namespace GUI {
-class Image {
+class Image
+{
public:
Image(const char* data, size_t size);
Image(const std::string& filename);
+ Image(Image&& other);
~Image();
+ Image& operator=(Image&& other);
+
size_t width() const;
size_t height() const;
@@ -49,8 +53,9 @@ private:
void load(const char* data, size_t size);
- size_t _width, _height;
- unsigned char* image_data;
+ std::size_t _width{0};
+ std::size_t _height{0};
+ unsigned char* image_data{nullptr};
};
} // GUI::
diff --git a/plugingui/imagecache.cc b/plugingui/imagecache.cc
new file mode 100644
index 0000000..6ce1171
--- /dev/null
+++ b/plugingui/imagecache.cc
@@ -0,0 +1,104 @@
+/* -*- 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::move(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::
diff --git a/plugingui/imagecache.h b/plugingui/imagecache.h
new file mode 100644
index 0000000..9ca28fb
--- /dev/null
+++ b/plugingui/imagecache.h
@@ -0,0 +1,72 @@
+/* -*- 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::
--
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