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sortix--sortix/kernel/vgatextbuffer.h

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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2012, 2013.
This file is part of Sortix.
Sortix 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 3 of the License, or (at your option) any later
version.
Sortix 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
Sortix. If not, see <http://www.gnu.org/licenses/>.
vgatextbuffer.h
An indexable text buffer with the VGA text mode framebuffer as backend.
*******************************************************************************/
#ifndef SORTIX_VGATEXTBUFFER_H
#define SORTIX_VGATEXTBUFFER_H
#include <sortix/kernel/textbuffer.h>
namespace Sortix {
class VGATextBuffer : public TextBuffer
{
public:
VGATextBuffer(uint16_t* vga, uint16_t* attr, size_t width, size_t height);
virtual ~VGATextBuffer();
virtual size_t Width() const;
virtual size_t Height() const;
virtual TextChar GetChar(TextPos pos) const;
virtual void SetChar(TextPos pos, TextChar c);
virtual uint16_t GetCharAttr(TextPos pos) const ;
virtual void SetCharAttr(TextPos pos, uint16_t attrval);
virtual void Scroll(ssize_t off, TextChar fillwith);
virtual void Move(TextPos to, TextPos from, size_t numchars);
virtual void Fill(TextPos from, TextPos to, TextChar fillwith,
uint16_t fillattr);
virtual bool GetCursorEnabled() const;
virtual void SetCursorEnabled(bool enablecursor);
virtual TextPos GetCursorPos() const;
virtual void SetCursorPos(TextPos cursorpos);
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virtual bool EmergencyIsImpaired();
virtual bool EmergencyRecoup();
virtual void EmergencyReset();
private:
bool UsablePosition(TextPos pos) const;
TextPos CropPosition(TextPos pos) const;
size_t OffsetOfPos(TextPos pos) const;
void UpdateCursor();
private:
uint16_t* vga;
uint16_t* attr;
size_t width;
size_t height;
TextPos cursorpos;
bool cursorenabled;
};
} // namespace Sortix
#endif