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sortix--sortix/sortix/lfbtextbuffer.h
2012-07-30 19:02:05 +02:00

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3.3 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2012.
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/>.
lfbtextbuffer.h
An indexable text buffer rendered to a graphical linear frame buffer.
*******************************************************************************/
#ifndef SORTIX_LFBTEXTBUFFER_H
#define SORTIX_LFBTEXTBUFFER_H
#include <sortix/kernel/textbuffer.h>
namespace Sortix {
// Needed information:
// Linear frame bufer
// - Pointer
// - Format (bit depth)
// - X resolution, Y resolution, scanline size
// Font
// - Pointer to our copy of the font.
// Color table for each VGA color in <sortix/vga.h>
// Number of columns and rows.
// Table of characters and attributes.
struct LFBTextBufferInfo
{
uint8_t* lfb;
size_t lfbformat;
size_t xres;
size_t yres;
size_t columns;
size_t rows;
uint16_t* chars;
uint16_t* attrs;
uint8_t* vgafont;
};
class LFBTextBuffer : public TextBuffer
{
friend LFBTextBuffer* CreateLFBTextBuffer(uint8_t* lfb, uint32_t lfbformat,
size_t xres, size_t yres,
size_t scansize);
private:
LFBTextBuffer();
public:
virtual ~LFBTextBuffer();
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 newcursorpos);
private:
void RenderChar(uint16_t vgachar, size_t posx, size_t posy);
void RenderCharAt(TextPos pos);
void RenderRegion(size_t c1, size_t r1, size_t c2, size_t r2);
void RenderRange(TextPos from, TextPos to);
bool UsablePosition(TextPos pos) const;
size_t OffsetOfPos(TextPos pos) const;
TextPos CropPosition(TextPos pos) const;
TextPos AddToPosition(TextPos pos, size_t count);
private:
uint8_t* lfb;
uint8_t* font;
uint16_t* chars;
uint16_t* attrs;
size_t columns;
size_t rows;
size_t pixelsx;
size_t pixelsy;
size_t scansize;
uint32_t colors[16UL];
uint32_t cursorcolor;
uint32_t lfbformat;
bool cursorenabled;
TextPos cursorpos;
};
LFBTextBuffer* CreateLFBTextBuffer(uint8_t* lfb, uint32_t lfbformat,
size_t xres, size_t yres, size_t scansize);
} // namespace Sortix
#endif