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_audio_utils/gui/juce_AudioThumbnailCache.cpp

@@ -0,0 +1,197 @@
+/*
+  ==============================================================================
+
+   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
+{
+
+class AudioThumbnailCache::ThumbnailCacheEntry
+{
+public:
+    ThumbnailCacheEntry (const int64 hashCode)
+        : hash (hashCode),
+          lastUsed (Time::getMillisecondCounter())
+    {
+    }
+
+    ThumbnailCacheEntry (InputStream& in)
+        : hash (in.readInt64()),
+          lastUsed (0)
+    {
+        const int64 len = in.readInt64();
+        in.readIntoMemoryBlock (data, (ssize_t) len);
+    }
+
+    void write (OutputStream& out)
+    {
+        out.writeInt64 (hash);
+        out.writeInt64 ((int64) data.getSize());
+        out << data;
+    }
+
+    int64 hash;
+    uint32 lastUsed;
+    MemoryBlock data;
+
+private:
+    JUCE_LEAK_DETECTOR (ThumbnailCacheEntry)
+};
+
+//==============================================================================
+AudioThumbnailCache::AudioThumbnailCache (const int maxNumThumbs)
+    : thread ("thumb cache"),
+      maxNumThumbsToStore (maxNumThumbs)
+{
+    jassert (maxNumThumbsToStore > 0);
+    thread.startThread (2);
+}
+
+AudioThumbnailCache::~AudioThumbnailCache()
+{
+}
+
+AudioThumbnailCache::ThumbnailCacheEntry* AudioThumbnailCache::findThumbFor (const int64 hash) const
+{
+    for (int i = thumbs.size(); --i >= 0;)
+        if (thumbs.getUnchecked(i)->hash == hash)
+            return thumbs.getUnchecked(i);
+
+    return nullptr;
+}
+
+int AudioThumbnailCache::findOldestThumb() const
+{
+    int oldest = 0;
+    uint32 oldestTime = Time::getMillisecondCounter() + 1;
+
+    for (int i = thumbs.size(); --i >= 0;)
+    {
+        const ThumbnailCacheEntry* const te = thumbs.getUnchecked(i);
+
+        if (te->lastUsed < oldestTime)
+        {
+            oldest = i;
+            oldestTime = te->lastUsed;
+        }
+    }
+
+    return oldest;
+}
+
+bool AudioThumbnailCache::loadThumb (AudioThumbnailBase& thumb, const int64 hashCode)
+{
+    const ScopedLock sl (lock);
+
+    if (ThumbnailCacheEntry* te = findThumbFor (hashCode))
+    {
+        te->lastUsed = Time::getMillisecondCounter();
+
+        MemoryInputStream in (te->data, false);
+        thumb.loadFrom (in);
+        return true;
+    }
+
+    return loadNewThumb (thumb, hashCode);
+}
+
+void AudioThumbnailCache::storeThumb (const AudioThumbnailBase& thumb,
+                                      const int64 hashCode)
+{
+    const ScopedLock sl (lock);
+    ThumbnailCacheEntry* te = findThumbFor (hashCode);
+
+    if (te == nullptr)
+    {
+        te = new ThumbnailCacheEntry (hashCode);
+
+        if (thumbs.size() < maxNumThumbsToStore)
+            thumbs.add (te);
+        else
+            thumbs.set (findOldestThumb(), te);
+    }
+
+    {
+        MemoryOutputStream out (te->data, false);
+        thumb.saveTo (out);
+    }
+
+    saveNewlyFinishedThumbnail (thumb, hashCode);
+}
+
+void AudioThumbnailCache::clear()
+{
+    const ScopedLock sl (lock);
+    thumbs.clear();
+}
+
+void AudioThumbnailCache::removeThumb (const int64 hashCode)
+{
+    const ScopedLock sl (lock);
+
+    for (int i = thumbs.size(); --i >= 0;)
+        if (thumbs.getUnchecked(i)->hash == hashCode)
+            thumbs.remove (i);
+}
+
+static int getThumbnailCacheFileMagicHeader() noexcept
+{
+    return (int) ByteOrder::littleEndianInt ("ThmC");
+}
+
+bool AudioThumbnailCache::readFromStream (InputStream& source)
+{
+    if (source.readInt() != getThumbnailCacheFileMagicHeader())
+        return false;
+
+    const ScopedLock sl (lock);
+    clear();
+    int numThumbnails = jmin (maxNumThumbsToStore, source.readInt());
+
+    while (--numThumbnails >= 0 && ! source.isExhausted())
+        thumbs.add (new ThumbnailCacheEntry (source));
+
+    return true;
+}
+
+void AudioThumbnailCache::writeToStream (OutputStream& out)
+{
+    const ScopedLock sl (lock);
+
+    out.writeInt (getThumbnailCacheFileMagicHeader());
+    out.writeInt (thumbs.size());
+
+    for (int i = 0; i < thumbs.size(); ++i)
+        thumbs.getUnchecked(i)->write (out);
+}
+
+void AudioThumbnailCache::saveNewlyFinishedThumbnail (const AudioThumbnailBase&, int64)
+{
+}
+
+bool AudioThumbnailCache::loadNewThumb (AudioThumbnailBase&, int64)
+{
+    return false;
+}
+
+} // namespace juce