comparison base/ResizeableBitset.h @ 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

+/* -*- 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
+