annotate base/ResizeableBitmap.h @ 109:61a2ac1241b3

* Make a single base Thread class for RT and non-RT threads
* Pull ResizeableBitmap out from the MatrixFile's ColumnBitmap
* Reorder SpectrogramLayer::paint somewhat so as to improve cache hit ratio
  in the FFT file cache

/* -*- 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, bool state) {
        if (state) {
            ((*m_bits)[column / 8]) |=  (uint8_t(1) << (column % 8));
        } else {
            ((*m_bits)[column / 8]) &= ~(uint8_t(1) << (column % 8));
        }
    }
    
private:
    std::vector<uint8_t> *m_bits;
};


#endif