comparison data/fft/FFTDataServer.h @ 154:6ec58bb8f729

* Suspend/resume fft data server write activity while reading from a server
  to repaint the spectrogram display.  Makes a significant improvement to
  the otherwise dreadful responsiveness of spectrogram display.

     float      getPhaseAt(size_t x, size_t y);
     void       getValuesAt(size_t x, size_t y, float &real, float &imaginary);
     bool       isColumnReady(size_t x);
 
     void       suspend();
+    void       resume(); // also happens automatically if new data needed
 
     // Convenience functions:
 
     bool isLocalPeak(size_t x, size_t y) {
         float mag = getMagnitudeAt(x, y);

     typedef std::deque<int> IntQueue;
     IntQueue m_dormantCaches;
 
     int m_lastUsedCache;
     FFTCache *getCache(size_t x, size_t &col) {
-        if (m_suspended) resume();
         col   = x % m_cacheWidth;
         int c = x / m_cacheWidth;
         // The only use of m_lastUsedCache without a lock is to
         // establish whether a cache has been created at all (they're
         // created on demand, but not destroyed until the server is).

     bool m_suspended;
     FillThread *m_fillThread;
 
     void deleteProcessingData();
     void fillColumn(size_t x);
-    void resume();
 
     QString generateFileBasename() const;
     static QString generateFileBasename(const DenseTimeValueModel *model,
                                         int channel,
                                         WindowType windowType,