Made AudioThumbnail::loadFrom return a bool.

modules/juce_audio_utils/gui/juce_AudioThumbnail.cpp

@@ -573,12 +573,12 @@ void AudioThumbnail::createChannels (const int length)
 }
 
 //==============================================================================
-void AudioThumbnail::loadFrom (InputStream& rawInput)
+bool AudioThumbnail::loadFrom (InputStream& rawInput)
 {
     BufferedInputStream input (rawInput, 4096);
 
     if (input.readByte() != 'j' || input.readByte() != 'a' || input.readByte() != 't' || input.readByte() != 'm')
-        return;
+        return false;
 
     const ScopedLock sl (lock);
     clearChannelData();
@@ -596,6 +596,8 @@ void AudioThumbnail::loadFrom (InputStream& rawInput)
     for (int i = 0; i < numThumbnailSamples; ++i)
         for (int chan = 0; chan < numChannels; ++chan)
             channels.getUnchecked(chan)->getData(i)->read (input);
+
+    return true;
 }
 
 void AudioThumbnail::saveTo (OutputStream& output) const

modules/juce_audio_utils/gui/juce_AudioThumbnail.h

@@ -119,7 +119,7 @@ public:
         previously have been created by the saveTo() method.
         @see saveTo
     */
-    void loadFrom (InputStream& input);
+    bool loadFrom (InputStream& input);
 
     /** Saves the low res thumbnail data to an output stream.
 

modules/juce_audio_utils/gui/juce_AudioThumbnailBase.h

@@ -83,7 +83,7 @@ public:
         previously have been created by the saveTo() method.
         @see saveTo
     */
-    virtual void loadFrom (InputStream& input) = 0;
+    virtual bool loadFrom (InputStream& input) = 0;
 
     /** Saves the low res thumbnail data to an output stream.
 

modules/juce_audio_utils/gui/juce_AudioThumbnailCache.cpp

@@ -26,16 +26,16 @@
 class AudioThumbnailCache::ThumbnailCacheEntry
 {
 public:
-    ThumbnailCacheEntry (const int64 hash_)
-        : hash (hash_),
+    ThumbnailCacheEntry (const int64 hashCode)
+        : hash (hashCode),
           lastUsed (Time::getMillisecondCounter())
     {
     }
 
     ThumbnailCacheEntry (InputStream& in)
-        : lastUsed (0)
+        : hash (in.readInt64()),
+          lastUsed (0)
     {
-        hash = in.readInt64();
         const int64 len = in.readInt64();
         in.readIntoMemoryBlock (data, (ssize_t) len);
     }

modules/juce_audio_utils/gui/juce_AudioThumbnailCache.h

@@ -54,8 +54,7 @@ public:
     virtual ~AudioThumbnailCache();
 
     //==============================================================================
-    /** Clears out any stored thumbnails.
-    */
+    /** Clears out any stored thumbnails. */
     void clear();
 
     /** Reloads the specified thumb if this cache contains the appropriate stored
@@ -89,9 +88,14 @@ public:
     TimeSliceThread& getTimeSliceThread() noexcept      { return thread; }
 
 protected:
-    /** */
+    /** This can be overridden to provide a custom callback for saving thumbnails
+        once they have finished being loaded.
+    */
     virtual void saveNewlyFinishedThumbnail (const AudioThumbnailBase&, int64 hashCode);
-    /** */
+
+    /** This can be overridden to provide a custom callback for loading thumbnails
+        from pre-saved files to save the cache the trouble of having to create them.
+    */
     virtual bool loadNewThumb (AudioThumbnailBase&, int64 hashCode);
 
 private: