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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* canvas.h
*
* Sun Sep 4 13:03:51 CEST 2016
* Copyright 2016 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* DrumGizmo 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#pragma once
#include "pixelbuffer.h"
namespace GUI
{
//! Abstract class that can be used by the Paiter to draw on.
class Canvas
{
public:
virtual ~Canvas() = default;
//! @returns a reference to the pixel buffer.
virtual PixelBufferAlpha& GetPixelBuffer() = 0;
//! Signal the beginning of a paint operation.
virtual void beginPaint() = 0;
//! Signal the ending of a paint operation
//! This might trigger a redraw operation.
virtual void endPaint() = 0;
};
} // GUI::
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