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1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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2
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3 /*
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4 Sonic Visualiser
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5 An audio file viewer and annotation editor.
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6 Centre for Digital Music, Queen Mary, University of London.
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7 This file copyright 2006 Chris Cannam.
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8
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9 This program is free software; you can redistribute it and/or
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10 modify it under the terms of the GNU General Public License as
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11 published by the Free Software Foundation; either version 2 of the
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12 License, or (at your option) any later version. See the file
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13 COPYING included with this distribution for more information.
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14 */
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15
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16 #ifndef _RESIZEABLE_BITMAP_H_
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17 #define _RESIZEABLE_BITMAP_H_
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18
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19 #include <vector>
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20 #include <stdint.h>
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21
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22 class ResizeableBitset {
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23
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24 public:
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25 ResizeableBitset() : m_bits(0) {
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26 }
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27 ResizeableBitset(size_t size) : m_bits(new std::vector<uint8_t>), m_size(size) {
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28 m_bits->assign((size >> 3) + 1, 0);
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29 }
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30 ResizeableBitset(const ResizeableBitset &b) {
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31 m_bits = new std::vector<uint8_t>(*b.m_bits);
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32 }
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33 ResizeableBitset &operator=(const ResizeableBitset &b) {
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34 if (&b != this) return *this;
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35 delete m_bits;
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36 m_bits = new std::vector<uint8_t>(*b.m_bits);
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37 return *this;
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38 }
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39 ~ResizeableBitset() {
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40 delete m_bits;
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41 }
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42
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43 void resize(size_t bits) { // losing all data
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44 if (!m_bits || bits < m_bits->size()) {
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45 delete m_bits;
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46 m_bits = new std::vector<uint8_t>;
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47 }
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48 m_bits->assign((bits >> 3) + 1, 0);
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49 m_size = bits;
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50 }
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51
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52 bool get(size_t column) const {
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53 return ((*m_bits)[column >> 3]) & (1u << (column & 0x07));
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54 }
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55
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56 void set(size_t column) {
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57 ((*m_bits)[column >> 3]) |= (uint8_t(1) << (column & 0x07));
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58 }
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59
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60 void reset(size_t column) {
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61 ((*m_bits)[column >> 3]) &= ~(uint8_t(1) << (column & 0x07));
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62 }
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63
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64 void copy(size_t source, size_t dest) {
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65 get(source) ? set(dest) : reset(dest);
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66 }
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67
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68 size_t size() const {
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69 return m_size;
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70 }
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71
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72 private:
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73 std::vector<uint8_t> *m_bits;
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74 size_t m_size;
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75 };
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76
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77
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78 #endif
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79
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