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@92: #include <QMutex>
Chris@92: #include <map>
Chris@87: 
Chris@95: #include "FileReadThread.h"
Chris@87: 
Chris@96: class MatrixFile : public QObject
Chris@87: {
Chris@95:     Q_OBJECT
Chris@95: 
Chris@87: public:
Chris@87:     enum Mode { ReadOnly, ReadWrite };
Chris@87: 
Chris@96:     MatrixFile(QString fileBase, Mode mode);
Chris@96:     virtual ~MatrixFile();
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@95:     float getValueAt(size_t x, size_t y);
Chris@95:     void getColumnAt(size_t x, float *values);
Chris@87: 
Chris@87:     void setValueAt(size_t x, size_t y, float value);
Chris@87:     void setColumnAt(size_t x, float *values);
Chris@95: 
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_headerSize;
Chris@92:     QString m_fileName;
Chris@95:     size_t  m_defaultCacheWidth;
Chris@95:     size_t  m_prevX;
Chris@87: 
Chris@95:     struct Cache {
Chris@95:         size_t  x;
Chris@95:         size_t  width;
Chris@95:         float  *data;
Chris@95:     };
Chris@90: 
Chris@95:     Cache m_cache;
Chris@87: 
Chris@95:     bool getValuesFromCache(size_t x, size_t ystart, size_t ycount,
Chris@95:                             float *values);
Chris@95: 
Chris@95:     void primeCache(size_t x, bool left);
Chris@95: 
Chris@95:     bool seekTo(size_t x, size_t y);
Chris@95: 
Chris@95:     FileReadThread m_readThread;
Chris@95:     int m_requestToken;
Chris@97: 
Chris@95:     size_t m_requestingX;
Chris@95:     size_t m_requestingWidth;
Chris@97:     char *m_spareData;
Chris@92: 
Chris@92:     static std::map<QString, int> m_refcount;
Chris@92:     static QMutex m_refcountMutex;
Chris@95:     QMutex m_fdMutex;
Chris@95:     QMutex m_cacheMutex;
Chris@87: };
Chris@87: 
Chris@87: #endif
Chris@87: