Chris@109: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@109: 
Chris@109: /*
Chris@109:     Sonic Visualiser
Chris@109:     An audio file viewer and annotation editor.
Chris@109:     Centre for Digital Music, Queen Mary, University of London.
Chris@109:     This file copyright 2006 Chris Cannam.
Chris@109:     
Chris@109:     This program is free software; you can redistribute it and/or
Chris@109:     modify it under the terms of the GNU General Public License as
Chris@109:     published by the Free Software Foundation; either version 2 of the
Chris@109:     License, or (at your option) any later version.  See the file
Chris@109:     COPYING included with this distribution for more information.
Chris@109: */
Chris@109: 
Chris@109: #ifndef _RESIZEABLE_BITMAP_H_
Chris@109: #define _RESIZEABLE_BITMAP_H_
Chris@109: 
Chris@109: #include <vector>
Chris@109: #include <stdint.h>
Chris@109: 
Chris@109: class ResizeableBitmap {
Chris@109: 
Chris@109: public:
Chris@109:     ResizeableBitmap() : m_bits(0) {
Chris@109:     }
Chris@109:     ResizeableBitmap(size_t size) : m_bits(new std::vector<uint8_t>) {
Chris@109:         m_bits->assign(size / 8 + 1, 0);
Chris@109:     }
Chris@109:     ResizeableBitmap(const ResizeableBitmap &b) {
Chris@109:         m_bits = new std::vector<uint8_t>(*b.m_bits);
Chris@109:     }
Chris@109:     ResizeableBitmap &operator=(const ResizeableBitmap &b) {
Chris@109:         if (&b != this) return *this;
Chris@109:         delete m_bits;
Chris@109:         m_bits = new std::vector<uint8_t>(*b.m_bits);
Chris@109:         return *this;
Chris@109:     }
Chris@109:     ~ResizeableBitmap() {
Chris@109:         delete m_bits;
Chris@109:     }
Chris@109:     
Chris@109:     void resize(size_t bits) { // losing all data
Chris@109:         if (!m_bits || bits < m_bits->size()) {
Chris@109:             delete m_bits;
Chris@109:             m_bits = new std::vector<uint8_t>;
Chris@109:         }
Chris@109:         m_bits->assign(bits / 8, 0);
Chris@109:     }
Chris@109:     
Chris@109:     bool get(size_t column) const {
Chris@109:         return ((*m_bits)[column / 8]) & (1u << (column % 8));
Chris@109:     }
Chris@109:     
Chris@112:     void set(size_t column) {
Chris@112:         ((*m_bits)[column / 8]) |=  (uint8_t(1) << (column % 8));
Chris@112:     }
Chris@112: 
Chris@112:     void reset(size_t column) {
Chris@112:         ((*m_bits)[column / 8]) &= ~(uint8_t(1) << (column % 8));
Chris@112:     }
Chris@112: 
Chris@112:     void copy(size_t source, size_t dest) {
Chris@112:         get(source) ? set(dest) : reset(dest);
Chris@109:     }
Chris@109:     
Chris@109: private:
Chris@109:     std::vector<uint8_t> *m_bits;
Chris@109: };
Chris@109: 
Chris@109: 
Chris@109: #endif
Chris@109: