Chris@87: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@87: 
Chris@87: /*
Chris@87:     Sonic Visualiser
Chris@87:     An audio file viewer and annotation editor.
Chris@87:     Centre for Digital Music, Queen Mary, University of London.
Chris@87:     This file copyright 2006 Chris Cannam.
Chris@87:     
Chris@87:     This program is free software; you can redistribute it and/or
Chris@87:     modify it under the terms of the GNU General Public License as
Chris@87:     published by the Free Software Foundation; either version 2 of the
Chris@87:     License, or (at your option) any later version.  See the file
Chris@87:     COPYING included with this distribution for more information.
Chris@87: */
Chris@87: 
Chris@87: #ifndef _MATRIX_FILE_CACHE_H_
Chris@87: #define _MATRIX_FILE_CACHE_H_
Chris@87: 
Chris@87: #include <sys/types.h>
Chris@87: #include <QString>
Chris@87: 
Chris@87: // This class is _not_ thread safe.  Each instance must only be used
Chris@87: // within a single thread.  You may however have as many instances as
Chris@87: // you like referring to the same file in separate threads.
Chris@87: 
Chris@87: class MatrixFileCache
Chris@87: {
Chris@87: public:
Chris@87:     enum Mode { ReadOnly, ReadWrite };
Chris@87: 
Chris@87:     MatrixFileCache(QString fileBase, Mode mode);
Chris@87:     virtual ~MatrixFileCache();
Chris@87: 
Chris@87:     size_t getWidth() const;
Chris@87:     size_t getHeight() const;
Chris@87:     
Chris@87:     void resize(size_t width, size_t height);
Chris@87:     void reset();
Chris@87: 
Chris@87:     void setRangeOfInterest(size_t x, size_t width);
Chris@87: 
Chris@87:     float getValueAt(size_t x, size_t y) const;
Chris@87:     void getColumnAt(size_t x, float *values) const;
Chris@87: //    float getColumnMaximum(size_t x) const;
Chris@87: //    float getColumnMinimum(size_t x) const;
Chris@87: 
Chris@87:     void setValueAt(size_t x, size_t y, float value);
Chris@87:     void setColumnAt(size_t x, float *values);
Chris@87:     
Chris@87: protected:
Chris@87:     int     m_fd;
Chris@87:     Mode    m_mode;
Chris@87:     size_t  m_width;
Chris@87:     size_t  m_height;
Chris@87:     size_t  m_rx;
Chris@87:     size_t  m_rw;
Chris@87:     float **m_range;
Chris@87:     size_t  m_headerSize;
Chris@87: 
Chris@87:     mutable off_t m_off;
Chris@87: 
Chris@87:     bool seekTo(size_t x, size_t y) const;
Chris@87: };
Chris@87: 
Chris@87: #endif
Chris@87: