comparison base/LogRange.h @ 266:2268963dabd1

* FFT: fix invalid write of normalisation factor in compact mode of disc cache
* FFT: fix range problem for normalisation factor in compact mode (it was
  stored as an unsigned scaled from an assumed float range of 0->1, which
  is not very plausible and not accurate enough even if true -- use a float
  instead)
* Spectrogram: fix vertical zoom behaviour for log frequency spectrograms:
  make the thing in the middle of the display remain in the middle after zoom
* Overview widget: don't update the detailed waveform if still decoding the
  audio file (too expensive to do all those redraws)

      * Map a value onto a logarithmic range.  This just means taking
      * the base-10 log of the absolute value, or using the threshold
      * value if the absolute value is zero.
      */
     static float map(float value, float thresh = -10);
+
+    /**
+     * Map a value from the logarithmic range back again.  This just
+     * means taking the value'th power of ten.
+     */
+    static float unmap(float value);
 };
 
 #endif