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sortix--sortix/kernel/lfbtextbuffer.h
2014-03-01 14:37:39 +01:00

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4.5 KiB
C++

/*******************************************************************************
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/>.
lfbtextbuffer.h
An indexable text buffer rendered to a graphical linear frame buffer.
*******************************************************************************/
#ifndef SORTIX_LFBTEXTBUFFER_H
#define SORTIX_LFBTEXTBUFFER_H
#include <sortix/kernel/kthread.h>
#include <sortix/kernel/textbuffer.h>
namespace Sortix {
enum TextBufferCmdType
{
TEXTBUFCMD_EXIT = 0,
TEXTBUFCMD_SYNC,
TEXTBUFCMD_PAUSE,
TEXTBUFCMD_CHAR,
TEXTBUFCMD_ATTR,
TEXTBUFCMD_CURSOR_SET_ENABLED,
TEXTBUFCMD_CURSOR_MOVE,
TEXTBUFCMD_MOVE,
TEXTBUFCMD_FILL,
TEXTBUFCMD_SCROLL,
};
struct TextBufferCmd
{
union { TextBufferCmdType type; size_t align; };
union { size_t x; size_t from_x; ssize_t scroll_offset; };
union { size_t y; size_t from_y; };
union { size_t to_x; };
union { size_t to_y; };
union
{
bool b;
struct { uint16_t c; uint16_t attr; };
size_t val;
};
};
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);
virtual bool EmergencyIsImpaired();
virtual bool EmergencyRecoup();
virtual void EmergencyReset();
public:
virtual void RenderThread();
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);
void DoScroll(ssize_t off, uint16_t entry);
void DoMove(TextPos to, TextPos from, size_t numchars);
void DoFill(TextPos from, TextPos to, uint16_t fillwith, uint16_t fillattr);
void IssueCommand(TextBufferCmd* cmd);
void StopRendering();
void ResumeRendering();
bool IsCommandIdempotent(const TextBufferCmd* cmd) const;
void ExecuteCommand(TextBufferCmd* cmd,
bool& exit_requested,
bool& sync_requested,
bool& pause_requested,
TextPos& render_from,
TextPos& render_to);
private:
kthread_mutex_t execute_lock;
kthread_mutex_t queue_lock;
kthread_cond_t queue_not_full;
kthread_cond_t queue_not_empty;
kthread_cond_t queue_exit;
kthread_cond_t queue_sync;
kthread_cond_t queue_paused;
kthread_cond_t queue_resume;
TextBufferCmd* queue;
size_t queue_length;
size_t queue_offset;
size_t queue_used;
bool queue_is_paused;
bool queue_thread;
uint8_t* lfb;
uint8_t* backbuf;
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 lfbformat;
bool cursorenabled;
TextPos cursorpos;
bool emergency_state;
size_t execute_amount;
};
LFBTextBuffer* CreateLFBTextBuffer(uint8_t* lfb, uint32_t lfbformat,
size_t xres, size_t yres, size_t scansize);
} // namespace Sortix
#endif