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    const float *end() const { return &m_data[m_size*m_size]; }
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    const float *end() const { return &m_data[m_size*m_size]; }
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    /// get pointer to data item with indices x and y
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    /// get pointer to data item with indices x and y
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    inline float *data(const int x, const int y) const { return m_data + index(x,y); }
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    inline float *data(const int x, const int y) const { return m_data + index(x,y); }
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    void setData(const int x, const int y, const float value) { *data(x,y) = value; }
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    void setData(const int x, const int y, const float value) { *data(x,y) = value; }
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    /// get index (e.g. for data()[index]) for indices x and y
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    /// get index (e.g. for data()[index]) for indices x and y
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    inline int index(const int x, const int y) const { return y*m_size + x; }
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    inline int index(const int x, const int y) const {  Q_ASSERT(y*m_size + x < m_size*m_size); return y*m_size + x; }
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    /// retrieve the value of the stamp at given indices x and y
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    /// retrieve the value of the stamp at given indices x and y
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    inline float operator()(const int x, const int y) const { return *data(x,y); }
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    inline float operator()(const int x, const int y) const { return *data(x,y); }
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    inline float offsetValue(const int x, const int y, const int offset) const { return *data(x+offset, y+offset); }
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    inline float offsetValue(const int x, const int y, const int offset) const { return *data(x+offset, y+offset); }
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    const Stamp *reader() const { return m_reader; }
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    const Stamp *reader() const { return m_reader; }
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    void setReader(Stamp *reader) { m_reader = reader; setCrownRadius(reader->crownRadius()); /*calculates also the Area*/ }
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    void setReader(Stamp *reader) { m_reader = reader; setCrownRadius(reader->crownRadius()); /*calculates also the Area*/ }