comparison layer/Colour3DPlotLayer.cpp @ 105:571805759a66

* 1502816 file export is too slow and memory-hungry
  Use text stream when writing to file instead of accumulating into a string.

* 1500625 Auto-align in MIDI layer confusing
  Make value extents convert to Hz in return value

* 1494623: Duplicate display of frame 0 from vamp plugin output

 
     QImage img(w, h, QImage::Format_RGB32);
 
     for (int x = x0; x < x1; ++x) {
 
-        float sx0 = (float(v->getFrameForX(x)) - modelStart) / modelWindow;
+        long xf = v->getFrameForX(x);
+        if (xf < 0) {
+            for (int y = 0; y < h; ++y) {
+                img.setPixel(x - x0, y, m_cache->color(0));
+            }
+            continue;
+        }
+
+        float sx0 = (float(xf) - modelStart) / modelWindow;
         float sx1 = (float(v->getFrameForX(x+1)) - modelStart) / modelWindow;
             
         int sx0i = int(sx0 + 0.001);
         int sx1i = int(sx1);