comparison layer/SpectrogramLayer.cpp @ 91:ed01c1261b55

* add a column bitmap to the matrix file object to record which columns
  are available (optimisation for refreshing during fft creation)

 #include <iostream>
 
 #include <cassert>
 #include <cmath>
 
-//#define DEBUG_SPECTROGRAM_REPAINT 1
+#define DEBUG_SPECTROGRAM_REPAINT 1
 
 static double mod(double x, double y)
 {
     double a = floor(x / y);
     double b = x - (y * a);

 
 	    for (int q = q0i; q <= q1i; ++q) {
 		for (int s = s0i; s <= s1i; ++s) {
 		    if (s >= 0 && q >= 0 && s < cw && q < ch) {
 
+                        if (!m_cache->haveColumnAt(s)) continue;
+
 			float value;
 
 			value = m_cache->getPhaseAt(s, q);
 			if (!have || value < phaseMin) { phaseMin = value; }
 			if (!have || value > phaseMax) { phaseMax = value; }

 		continue;
 	    } else {
 		s1i = s0i;
 	    }
 	}
+        
+        bool haveColumn = false;
+        for (size_t s = s0i; s <= s1i; ++s) {
+            if (m_cache->haveColumnAt(s)) {
+                haveColumn = true;
+                break;
+            }
+        }
+        if (!haveColumn) {
+            m_mutex.unlock();
+            continue;
+        }
 
 	for (size_t q = minbin; q < bins; ++q) {
 
 	    float f0 = (float(q) * sr) / m_windowSize;
 	    float f1 = (float(q + 1) * sr) / m_windowSize;