# HG changeset patch
# User Chris Cannam
# Date 1160507097 0
# Node ID f32212631b9ca14e735a73d0f1e360e1469bf518
# Parent  dc2fe023a14f0ad8a5e8d3e0ca3396c322bc8197
* Handle generator transforms (plugins whose channel count isn't dependent on
  number of audio inputs, as they have none)
* Be less keen to suspend writing FFT data in spectrogram repaint -- only do it
  if we find we actually need to query the FFT data (i.e. we aren't repainting
  an area that hasn't been generated at all yet)

diff -r dc2fe023a14f -r f32212631b9c layer/SpectrogramLayer.cpp
--- a/layer/SpectrogramLayer.cpp	Tue Oct 10 14:51:17 2006 +0000
+++ b/layer/SpectrogramLayer.cpp	Tue Oct 10 19:04:57 2006 +0000
@@ -1957,7 +1957,7 @@
     MagnitudeRange overallMag = m_viewMags[v];
     bool overallMagChanged = false;
 
-    fft->suspendWrites();
+    bool fftSuspended = false;
 
 #ifdef DEBUG_SPECTROGRAM_REPAINT
     std::cerr << (float(v->getFrameForX(1) - v->getFrameForX(0)) / increment) << " bins per pixel" << std::endl;
@@ -1992,6 +1992,12 @@
         for (int s = s0i; s <= s1i; ++s) {
 
             if (!fft->isColumnAvailable(s)) continue;
+            
+            if (!fftSuspended) {
+                fft->suspendWrites();
+                fftSuspended = true;
+            }
+
             MagnitudeRange mag;
 
             for (size_t q = minbin; q < bins; ++q) {
@@ -2149,7 +2155,7 @@
     std::cerr << "SpectrogramLayer::paint() returning" << std::endl;
 #endif
 
-    fft->resume();
+    if (fftSuspended) fft->resume();
 }
 
 void