moved frame cache to external class that's easier to pass around

app/render/backend/videorenderframecache.cpp

@@ -0,0 +1,62 @@
+#include "videorenderframecache.h"
+
+#include <QDir>
+#include <QFileInfo>
+
+#include "common/filefunctions.h"
+
+VideoRenderFrameCache::VideoRenderFrameCache()
+{
+
+}
+
+bool VideoRenderFrameCache::HasHash(const QByteArray &hash)
+{
+  return QFileInfo::exists(CachePathName(hash));
+}
+
+bool VideoRenderFrameCache::IsCaching(const QByteArray &hash)
+{
+  cache_hash_list_mutex_.lock();
+
+  bool is_caching = cache_hash_list_.contains(hash);
+
+  cache_hash_list_mutex_.unlock();
+
+  return is_caching;
+}
+
+bool VideoRenderFrameCache::TryCache(const QByteArray &hash)
+{
+  cache_hash_list_mutex_.lock();
+
+  bool is_caching = cache_hash_list_.contains(hash);
+
+  if (!is_caching) {
+    cache_hash_list_.append(hash);
+  }
+
+  cache_hash_list_mutex_.unlock();
+
+  return !is_caching;
+}
+
+void VideoRenderFrameCache::SetCacheID(const QString &id)
+{
+  cache_id_ = id;
+}
+
+QByteArray VideoRenderFrameCache::TimeToHash(const rational &time)
+{
+  return time_hash_map_.value(time);
+}
+
+QString VideoRenderFrameCache::CachePathName(const QByteArray &hash)
+{
+  QDir this_cache_dir = QDir(GetMediaCacheLocation()).filePath(cache_id_);
+  this_cache_dir.mkpath(".");
+
+  QString filename = QStringLiteral("%1.exr").arg(QString(hash.toHex()));
+
+  return this_cache_dir.filePath(filename);
+}