changeset 113:534373d65f39

* Use fractional window overlaps in the spectrogram, instead of percentages
  (90% is kind of meaningless when none of your window sizes are divisible
  by 10!)
* ResizeableBitmap -> ResizeableBitset and the odd other tidy up

--- a/base/FFTCache.h	Tue May 09 16:18:59 2006 +0000
+++ b/base/FFTCache.h	Wed May 10 11:43:52 2006 +0000
@@ -36,7 +36,7 @@
     virtual float getNormalizedMagnitudeAt(size_t x, size_t y) const = 0;
     virtual float getPhaseAt(size_t x, size_t y) const = 0;
 
-    virtual bool haveColumnAt(size_t x) const = 0;
+    virtual bool haveSetColumnAt(size_t x) const = 0;
     virtual void setColumnAt(size_t x, float *mags, float *phases, float factor) = 0;
 
     bool isLocalPeak(size_t x, size_t y) const {
@@ -120,7 +120,7 @@
         }
     }
     
-    virtual bool haveColumnAt(size_t x) const {
+    virtual bool haveSetColumnAt(size_t x) const {
         return true;
     }
 

--- a/base/ResizeableBitmap.h	Tue May 09 16:18:59 2006 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,73 +0,0 @@
-/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
-
-/*
-    Sonic Visualiser
-    An audio file viewer and annotation editor.
-    Centre for Digital Music, Queen Mary, University of London.
-    This file copyright 2006 Chris Cannam.
-    
-    This program is free software; you can redistribute it and/or
-    modify it under the terms of the GNU General Public License as
-    published by the Free Software Foundation; either version 2 of the
-    License, or (at your option) any later version.  See the file
-    COPYING included with this distribution for more information.
-*/
-
-#ifndef _RESIZEABLE_BITMAP_H_
-#define _RESIZEABLE_BITMAP_H_
-
-#include <vector>
-#include <stdint.h>
-
-class ResizeableBitmap {
-
-public:
-    ResizeableBitmap() : m_bits(0) {
-    }
-    ResizeableBitmap(size_t size) : m_bits(new std::vector<uint8_t>) {
-        m_bits->assign(size / 8 + 1, 0);
-    }
-    ResizeableBitmap(const ResizeableBitmap &b) {
-        m_bits = new std::vector<uint8_t>(*b.m_bits);
-    }
-    ResizeableBitmap &operator=(const ResizeableBitmap &b) {
-        if (&b != this) return *this;
-        delete m_bits;
-        m_bits = new std::vector<uint8_t>(*b.m_bits);
-        return *this;
-    }
-    ~ResizeableBitmap() {
-        delete m_bits;
-    }
-    
-    void resize(size_t bits) { // losing all data
-        if (!m_bits || bits < m_bits->size()) {
-            delete m_bits;
-            m_bits = new std::vector<uint8_t>;
-        }
-        m_bits->assign(bits / 8, 0);
-    }
-    
-    bool get(size_t column) const {
-        return ((*m_bits)[column / 8]) & (1u << (column % 8));
-    }
-    
-    void set(size_t column) {
-        ((*m_bits)[column / 8]) |=  (uint8_t(1) << (column % 8));
-    }
-
-    void reset(size_t column) {
-        ((*m_bits)[column / 8]) &= ~(uint8_t(1) << (column % 8));
-    }
-
-    void copy(size_t source, size_t dest) {
-        get(source) ? set(dest) : reset(dest);
-    }
-    
-private:
-    std::vector<uint8_t> *m_bits;
-};
-
-
-#endif
-

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/base/ResizeableBitset.h	Wed May 10 11:43:52 2006 +0000
@@ -0,0 +1,73 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    This file copyright 2006 Chris Cannam.
+    
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef _RESIZEABLE_BITMAP_H_
+#define _RESIZEABLE_BITMAP_H_
+
+#include <vector>
+#include <stdint.h>
+
+class ResizeableBitset {
+
+public:
+    ResizeableBitset() : m_bits(0) {
+    }
+    ResizeableBitset(size_t size) : m_bits(new std::vector<uint8_t>) {
+        m_bits->assign(size / 8 + 1, 0);
+    }
+    ResizeableBitset(const ResizeableBitset &b) {
+        m_bits = new std::vector<uint8_t>(*b.m_bits);
+    }
+    ResizeableBitset &operator=(const ResizeableBitset &b) {
+        if (&b != this) return *this;
+        delete m_bits;
+        m_bits = new std::vector<uint8_t>(*b.m_bits);
+        return *this;
+    }
+    ~ResizeableBitset() {
+        delete m_bits;
+    }
+    
+    void resize(size_t bits) { // losing all data
+        if (!m_bits || bits < m_bits->size()) {
+            delete m_bits;
+            m_bits = new std::vector<uint8_t>;
+        }
+        m_bits->assign(bits / 8, 0);
+    }
+    
+    bool get(size_t column) const {
+        return ((*m_bits)[column / 8]) & (1u << (column % 8));
+    }
+    
+    void set(size_t column) {
+        ((*m_bits)[column / 8]) |=  (uint8_t(1) << (column % 8));
+    }
+
+    void reset(size_t column) {
+        ((*m_bits)[column / 8]) &= ~(uint8_t(1) << (column % 8));
+    }
+
+    void copy(size_t source, size_t dest) {
+        get(source) ? set(dest) : reset(dest);
+    }
+    
+private:
+    std::vector<uint8_t> *m_bits;
+};
+
+
+#endif
+

--- a/base/Window.h	Tue May 09 16:18:59 2006 +0000
+++ b/base/Window.h	Wed May 10 11:43:52 2006 +0000
@@ -108,8 +108,8 @@
 	    
     case GaussianWindow:
 	for (i = 0; i < n; ++i) {
-	    mult[i] = mult[i] * exp((-1.0 / (n*n)) * ((T(2*i) - n) *
-						      (T(2*i) - n)));
+            mult[i] = mult[i] * exp(-(pow(i - (n-1)/2.0, 2) /
+                                      (2 * pow(0.25 * n, 2)))); // sd = 0.25
 	}
 	break;