52 lines
1.2 KiB
C++
52 lines
1.2 KiB
C++
/*
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* \brief Graphics backend interface
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* \date 2013-12-30
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* \author Norman Feske
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*/
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/*
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* Copyright (C) 2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__SCOUT__GRAPHICS_BACKEND_H_
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#define _INCLUDE__SCOUT__GRAPHICS_BACKEND_H_
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#include <scout/event.h>
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#include <scout/canvas.h>
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namespace Scout { struct Graphics_backend; }
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/*
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* We use two buffers, a foreground buffer that is displayed on screen and a
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* back buffer. While the foreground buffer must contain valid data all the
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* time, the back buffer can be used to prepare pixel data. For example,
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* drawing multiple pixel layers with alpha channel must be done in the back
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* buffer to avoid artifacts on the screen.
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*/
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struct Scout::Graphics_backend
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{
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virtual Canvas_base &front() = 0;
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virtual Canvas_base &back() = 0;
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virtual void copy_back_to_front(Rect rect) = 0;
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virtual void swap_back_and_front() = 0;
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/*
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* XXX todo mode-change notification
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*/
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virtual void position(Point p) = 0;
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virtual void bring_to_front() = 0;
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virtual void view_area(Area area) = 0;
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};
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#endif /* _INCLUDE__SCOUT__GRAPHICS_BACKEND_H_ */
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