serialplot is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License

  along with serialplot.  If not, see <http://www.gnu.org/licenses/>.

*/

// IMPORTANT NOTE: this file will be renamed to "framebuffer.h" when

// stream work is complete

#ifndef FRAMEBUFFER_H

#define FRAMEBUFFER_H

struct Range

{

    double start, end;

};

/// Abstract base class for all frame buffers.

class FrameBuffer

{

public:

    /// Returns size of the buffer.

    virtual unsigned size() const = 0;

    /// Returns a sample from given index.

    virtual double sample(unsigned i) const = 0;

    /// Returns minimum and maximum of the buffer values.

    virtual Range limits() const = 0;

};

/// Common base class for index and writable frame buffers

class ResizableBuffer : public FrameBuffer

{

    /// Resize the buffer.

    ///

    /// @important Resizing to same value is an error.

    virtual void resize(unsigned n) = 0;

};

/// Abstract base class for writable frame buffers

class WFrameBuffer : public ResizableBuffer

{

    /// Add samples to the buffer

    virtual void addSamples(double* samples, unsigned n) = 0;

    /// Reset all data to 0

    virtual void clear() = 0;