comparison base/MatrixFile.h @ 96:1aebdc68ec6d

* Introduce simple non-RT thread base class
* Rename MatrixFileCache to MatrixFile
* some fixes & tidying

+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    This file copyright 2006 Chris Cannam.
+    
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef _MATRIX_FILE_CACHE_H_
+#define _MATRIX_FILE_CACHE_H_
+
+#include <sys/types.h>
+#include <QString>
+#include <QMutex>
+#include <map>
+
+#include "FileReadThread.h"
+
+class MatrixFile : public QObject
+{
+    Q_OBJECT
+
+public:
+    enum Mode { ReadOnly, ReadWrite };
+
+    MatrixFile(QString fileBase, Mode mode);
+    virtual ~MatrixFile();
+
+    size_t getWidth() const;
+    size_t getHeight() const;
+    
+    void resize(size_t width, size_t height);
+    void reset();
+
+    float getValueAt(size_t x, size_t y);
+    void getColumnAt(size_t x, float *values);
+
+    void setValueAt(size_t x, size_t y, float value);
+    void setColumnAt(size_t x, float *values);
+
+protected slots:
+    void requestCancelled(int token);
+
+protected:
+    int     m_fd;
+    Mode    m_mode;
+    size_t  m_width;
+    size_t  m_height;
+    size_t  m_headerSize;
+    QString m_fileName;
+    size_t  m_defaultCacheWidth;
+    size_t  m_prevX;
+
+    struct Cache {
+        size_t  x;
+        size_t  width;
+        float  *data;
+    };
+
+    Cache m_cache;
+
+    bool getValuesFromCache(size_t x, size_t ystart, size_t ycount,
+                            float *values);
+
+    void primeCache(size_t x, bool left);
+
+    bool seekTo(size_t x, size_t y);
+
+    FileReadThread m_readThread;
+    int m_requestToken;
+    size_t m_requestingX;
+    size_t m_requestingWidth;
+
+    static std::map<QString, int> m_refcount;
+    static QMutex m_refcountMutex;
+    QMutex m_fdMutex;
+    QMutex m_cacheMutex;
+};
+
+#endif
+