git subrepo clone --branch=sono6good https://github.com/essej/JUCE.git deps/juce

subrepo:
  subdir:   "deps/juce"
  merged:   "b13f9084e"
upstream:
  origin:   "https://github.com/essej/JUCE.git"
  branch:   "sono6good"
  commit:   "b13f9084e"
git-subrepo:
  version:  "0.4.3"
  origin:   "https://github.com/ingydotnet/git-subrepo.git"
  commit:   "2f68596"

deps/juce/modules/juce_graphics/images/juce_ImageCache.cpp

@@ -0,0 +1,169 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2020 - Raw Material Software Limited
+
+   JUCE is an open source library subject to commercial or open-source
+   licensing.
+
+   By using JUCE, you agree to the terms of both the JUCE 6 End-User License
+   Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
+
+   End User License Agreement: www.juce.com/juce-6-licence
+   Privacy Policy: www.juce.com/juce-privacy-policy
+
+   Or: You may also use this code under the terms of the GPL v3 (see
+   www.gnu.org/licenses).
+
+   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
+   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
+   DISCLAIMED.
+
+  ==============================================================================
+*/
+
+namespace juce
+{
+
+struct ImageCache::Pimpl     : private Timer,
+                               private DeletedAtShutdown
+{
+    Pimpl() {}
+    ~Pimpl() override { clearSingletonInstance(); }
+
+    JUCE_DECLARE_SINGLETON_SINGLETHREADED_MINIMAL (ImageCache::Pimpl)
+
+    Image getFromHashCode (const int64 hashCode) noexcept
+    {
+        const ScopedLock sl (lock);
+
+        for (auto& item : images)
+        {
+            if (item.hashCode == hashCode)
+            {
+                item.lastUseTime = Time::getApproximateMillisecondCounter();
+                return item.image;
+            }
+        }
+
+        return {};
+     }
+
+    void addImageToCache (const Image& image, const int64 hashCode)
+    {
+        if (image.isValid())
+        {
+            if (! isTimerRunning())
+                startTimer (2000);
+
+            const ScopedLock sl (lock);
+            images.add ({ image, hashCode, Time::getApproximateMillisecondCounter() });
+        }
+    }
+
+    void timerCallback() override
+    {
+        auto now = Time::getApproximateMillisecondCounter();
+
+        const ScopedLock sl (lock);
+
+        for (int i = images.size(); --i >= 0;)
+        {
+            auto& item = images.getReference(i);
+
+            if (item.image.getReferenceCount() <= 1)
+            {
+                if (now > item.lastUseTime + cacheTimeout || now < item.lastUseTime - 1000)
+                    images.remove (i);
+            }
+            else
+            {
+                item.lastUseTime = now; // multiply-referenced, so this image is still in use.
+            }
+        }
+
+        if (images.isEmpty())
+            stopTimer();
+    }
+
+    void releaseUnusedImages()
+    {
+        const ScopedLock sl (lock);
+
+        for (int i = images.size(); --i >= 0;)
+            if (images.getReference(i).image.getReferenceCount() <= 1)
+                images.remove (i);
+    }
+
+    struct Item
+    {
+        Image image;
+        int64 hashCode;
+        uint32 lastUseTime;
+    };
+
+    Array<Item> images;
+    CriticalSection lock;
+    unsigned int cacheTimeout = 5000;
+
+    JUCE_DECLARE_NON_COPYABLE (Pimpl)
+};
+
+JUCE_IMPLEMENT_SINGLETON (ImageCache::Pimpl)
+
+
+//==============================================================================
+Image ImageCache::getFromHashCode (const int64 hashCode)
+{
+    if (Pimpl::getInstanceWithoutCreating() != nullptr)
+        return Pimpl::getInstanceWithoutCreating()->getFromHashCode (hashCode);
+
+    return {};
+}
+
+void ImageCache::addImageToCache (const Image& image, const int64 hashCode)
+{
+    Pimpl::getInstance()->addImageToCache (image, hashCode);
+}
+
+Image ImageCache::getFromFile (const File& file)
+{
+    auto hashCode = file.hashCode64();
+    auto image = getFromHashCode (hashCode);
+
+    if (image.isNull())
+    {
+        image = ImageFileFormat::loadFrom (file);
+        addImageToCache (image, hashCode);
+    }
+
+    return image;
+}
+
+Image ImageCache::getFromMemory (const void* imageData, const int dataSize)
+{
+    auto hashCode = (int64) (pointer_sized_int) imageData;
+    auto image = getFromHashCode (hashCode);
+
+    if (image.isNull())
+    {
+        image = ImageFileFormat::loadFrom (imageData, (size_t) dataSize);
+        addImageToCache (image, hashCode);
+    }
+
+    return image;
+}
+
+void ImageCache::setCacheTimeout (const int millisecs)
+{
+    jassert (millisecs >= 0);
+    Pimpl::getInstance()->cacheTimeout = (unsigned int) millisecs;
+}
+
+void ImageCache::releaseUnusedImages()
+{
+    Pimpl::getInstance()->releaseUnusedImages();
+}
+
+} // namespace juce