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sortix-mirror/kernel/lfbtextbuffer.cpp

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/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2012, 2013, 2014, 2015.
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.cpp
An indexable text buffer rendered to a graphical linear frame buffer.
*******************************************************************************/
#include <string.h>
#include <sortix/vga.h>
#include <sortix/kernel/kernel.h>
#include <sortix/kernel/kthread.h>
#include <sortix/kernel/refcount.h>
#include <sortix/kernel/scheduler.h>
#include <sortix/kernel/textbuffer.h>
#include <sortix/kernel/thread.h>
#include "vga.h"
#include "lfbtextbuffer.h"
namespace Sortix {
static uint32_t ColorFromRGB(uint8_t r, uint8_t g, uint8_t b)
{
union { struct { uint8_t b, g, r, a; }; uint32_t color; } ret;
ret.r = r;
ret.g = g;
ret.b = b;
ret.a = 255;
return ret.color;
}
static void LFBTextBuffer__RenderThread(void* user)
{
((LFBTextBuffer*) user)->RenderThread();
}
LFBTextBuffer* CreateLFBTextBuffer(uint8_t* lfb, uint32_t lfbformat,
size_t xres, size_t yres, size_t scansize)
{
const size_t QUEUE_LENGTH = 1024;
size_t columns = xres / (VGA_FONT_WIDTH + 1);
size_t rows = yres / VGA_FONT_HEIGHT;
size_t fontsize = VGA_FONT_CHARSIZE * VGA_FONT_NUMCHARS;
uint8_t* backbuf;
uint8_t* font;
TextChar* chars;
uint16_t* attrs;
TextBufferCmd* queue;
LFBTextBuffer* ret;
Process* kernel_process = Scheduler::GetKernelProcess();
if ( !(backbuf = new uint8_t[yres * scansize]) )
goto cleanup_done;
if ( !(font = new uint8_t[fontsize]) )
goto cleanup_backbuf;
if ( !(chars = new TextChar[columns * rows]) )
goto cleanup_font;
if ( !(attrs = new uint16_t[columns * rows]) )
goto cleanup_chars;
if ( !(queue = new TextBufferCmd[QUEUE_LENGTH]) )
goto cleanup_attrs;
if ( !(ret = new LFBTextBuffer) )
goto cleanup_queue;
memcpy(font, VGA::GetFont(), fontsize);
ret->execute_lock = KTHREAD_MUTEX_INITIALIZER;
ret->queue_lock = KTHREAD_MUTEX_INITIALIZER;
ret->queue_not_full = KTHREAD_COND_INITIALIZER;
ret->queue_not_empty = KTHREAD_COND_INITIALIZER;
ret->queue_exit = KTHREAD_COND_INITIALIZER;
ret->queue_sync = KTHREAD_COND_INITIALIZER;
ret->queue_paused = KTHREAD_COND_INITIALIZER;
ret->queue_resume = KTHREAD_COND_INITIALIZER;
ret->queue = queue;
ret->queue_length = QUEUE_LENGTH;
ret->queue_offset = 0;
ret->queue_used = 0;
ret->queue_is_paused = false;
ret->queue_thread = false;
ret->lfb = lfb;
ret->backbuf = backbuf;
ret->lfbformat = lfbformat;
ret->pixelsx = xres;
ret->pixelsy = yres;
ret->scansize = scansize;
ret->columns = columns;
ret->rows = rows;
ret->font = font;
memset(chars, 0, sizeof(chars[0]) * columns * rows);
ret->chars = chars;
memset(attrs, 0, sizeof(attrs[0]) * columns * rows);
ret->attrs = attrs;
for ( size_t i = 0; i < 16UL; i++ )
{
uint8_t r = i & 0b0100 ? (i & 0b1000 ? 255 : 191) : (i & 0b1000 ? 63 : 0);
uint8_t g = i & 0b0010 ? (i & 0b1000 ? 255 : 191) : (i & 0b1000 ? 63 : 0);
uint8_t b = i & 0b0001 ? (i & 0b1000 ? 255 : 191) : (i & 0b1000 ? 63 : 0);
ret->colors[i] = ColorFromRGB(r, g, b);
}
ret->cursorenabled = true;
ret->cursorpos = TextPos(0, 0);
for ( size_t y = 0; y < yres; y++ )
memset(lfb + scansize * y, 0, lfbformat/8UL * xres);
ret->emergency_state = false;
if ( !kernel_process )
return ret;
ret->queue_thread = true; // Visible to new thread.
if ( !RunKernelThread(kernel_process, LFBTextBuffer__RenderThread, ret) )
ret->queue_thread = false;
return ret;
cleanup_queue:
delete[] queue;
cleanup_attrs:
delete[] attrs;
cleanup_chars:
delete[] chars;
cleanup_font:
delete[] font;
cleanup_backbuf:
delete[] backbuf;
cleanup_done:
return NULL;
}
void LFBTextBuffer::SpawnThreads()
{
if ( queue_thread )
return;
Process* kernel_process = Scheduler::GetKernelProcess();
queue_thread = true; // Visible to new thread.
if ( !RunKernelThread(kernel_process, LFBTextBuffer__RenderThread, this) )
queue_thread = false;
}
LFBTextBuffer::LFBTextBuffer()
{
}
LFBTextBuffer::~LFBTextBuffer()
{
if ( queue_thread )
{
TextBufferCmd cmd;
cmd.type = TEXTBUFCMD_EXIT;
IssueCommand(&cmd);
kthread_mutex_lock(&queue_lock);
while ( queue_thread )
kthread_cond_wait(&queue_exit, &queue_lock);
kthread_mutex_unlock(&queue_lock);
}
delete[] backbuf;
delete[] font;
delete[] chars;
delete[] attrs;
delete[] queue;
}
size_t LFBTextBuffer::Width() const
{
return columns;
}
size_t LFBTextBuffer::Height() const
{
return rows;
}
bool LFBTextBuffer::UsablePosition(TextPos pos) const
{
return pos.x < columns && pos.y < rows;
}
TextPos LFBTextBuffer::CropPosition(TextPos pos) const
{
if ( columns <= pos.x )
pos.x = columns - 1;
if ( rows <= pos.y )
pos.y = rows -1;
return pos;
}
TextPos LFBTextBuffer::AddToPosition(TextPos pos, size_t count)
{
size_t index = pos.y * columns + pos.x + count;
TextPos ret(index % columns, index / columns);
return CropPosition(ret);
}
void LFBTextBuffer::RenderChar(TextChar textchar, size_t posx, size_t posy)
{
if ( columns <= posx || rows <= posy )
return;
// TODO: Support other font sizes and resolutions.
if ( lfbformat != 32 || VGA_FONT_WIDTH != 8UL )
return;
bool drawcursor = cursorenabled && posx == cursorpos.x && posy == cursorpos.y;
uint8_t fgcoloridx = textchar.vgacolor >> 0 & 0x0F;
uint8_t bgcoloridx = textchar.vgacolor >> 4 & 0x0F;
uint32_t fgcolor = colors[fgcoloridx];
uint32_t bgcolor = colors[bgcoloridx];
int remap = VGA::MapWideToVGAFont(textchar.c);
const uint8_t* charfont = VGA::GetCharacterFont(font, remap);
for ( size_t y = 0; y < VGA_FONT_HEIGHT; y++ )
{
size_t pixely = posy * VGA_FONT_HEIGHT + y;
uint8_t linebitmap = charfont[y];
uint32_t* line = (uint32_t*) (lfb + pixely * scansize);
size_t pixelxoff = posx * (VGA_FONT_WIDTH+1);
for ( size_t x = 0; x < VGA_FONT_WIDTH; x++ )
line[pixelxoff + x] = linebitmap & 1 << (7-x) ? fgcolor : bgcolor;
uint32_t lastcolor = bgcolor;
if ( 0xB0 <= remap && remap <= 0xDF && (linebitmap & 1) )
lastcolor = fgcolor;
line[pixelxoff + VGA_FONT_WIDTH] = lastcolor;
if ( unlikely(posx + 1 == columns) )
{
for ( size_t x = pixelxoff + VGA_FONT_WIDTH + 1; x < pixelsx; x++ )
line[x] = bgcolor;
}
}
if ( unlikely(posy + 1 == rows) )
{
size_t pixelyoff = rows * VGA_FONT_HEIGHT;
for ( size_t y = pixelyoff; y < pixelsy; y++ )
{
uint32_t* line = (uint32_t*) (lfb + y * scansize);
size_t pixelxoff = posx * (VGA_FONT_WIDTH+1);
for ( size_t x = 0; x < VGA_FONT_WIDTH + 1; x++ )
line[pixelxoff + x] = bgcolor;
if ( unlikely(posx + 1 == columns) )
{
for ( size_t x = pixelxoff + VGA_FONT_WIDTH + 1; x < pixelsx; x++ )
line[x] = bgcolor;
}
}
}
if ( likely(!drawcursor) )
return;
for ( size_t y = VGA_FONT_HEIGHT - 2; y < VGA_FONT_HEIGHT; y++ )
{
size_t pixely = posy * VGA_FONT_HEIGHT + y;
for ( size_t x = 0; x < VGA_FONT_WIDTH+1; x++ )
{
uint32_t* line = (uint32_t*) (lfb + pixely * scansize);
size_t pixelx = posx * (VGA_FONT_WIDTH+1) + x;
line[pixelx] = fgcolor;
}
}
}
void LFBTextBuffer::RenderCharAt(TextPos pos)
{
RenderChar(chars[pos.y * columns + pos.x], pos.x, pos.y);
}
void LFBTextBuffer::RenderRegion(size_t c1, size_t r1, size_t c2, size_t r2)
{
for ( size_t y = r1; y <= r2; y++ )
for ( size_t x = c1; x <= c2; x++ )
RenderChar(chars[y * columns + x], x, y);
}
void LFBTextBuffer::RenderRange(TextPos from, TextPos to)
{
from = CropPosition(from);
to = CropPosition(to);
#if !defined(HAS_FAST_VIDEO_MEMORY)
uint8_t* orig_lfb = lfb;
bool backbuffered = from.y != to.y;
if ( backbuffered )
{
lfb = backbuf;
from.x = 0;
to.x = columns - 1;
}
#endif
TextPos i = from;
RenderChar(chars[i.y * columns + i.x], i.x, i.y);
while ( !(i.x==to.x && i.y==to.y) )
{
i = AddToPosition(i, 1);
RenderChar(chars[i.y * columns + i.x], i.x, i.y);
}
#if !defined(HAS_FAST_VIDEO_MEMORY)
if ( backbuffered )
{
lfb = orig_lfb;
size_t scanline_start = from.y * VGA_FONT_HEIGHT;
size_t scanline_end = ((to.y+1) * VGA_FONT_HEIGHT) - 1;
if ( to.y + 1 == rows )
scanline_end = pixelsy - 1;
for ( size_t sc = scanline_start; sc <= scanline_end; sc++ )
{
size_t offset = sc * scansize;
memcpy(lfb + offset, backbuf + offset, pixelsx * sizeof(uint32_t));
}
}
#endif
}
void LFBTextBuffer::IssueCommand(TextBufferCmd* cmd)
{
if ( !queue_thread || emergency_state )
{
bool exit_requested = false;
bool sync_requested = false;
bool pause_requested = false;
TextPos render_from(columns - 1, rows - 1);
TextPos render_to(0, 0);
ExecuteCommand(cmd, exit_requested, sync_requested, pause_requested, render_from, render_to);
if ( !IsTextPosBeforeTextPos(render_to, render_from) )
RenderRange(render_from, render_to);
return;
}
ScopedLock lock(&queue_lock);
while ( queue_used == queue_length )
kthread_cond_wait(&queue_not_full, &queue_lock);
if ( !queue_used )
kthread_cond_signal(&queue_not_empty);
queue[(queue_offset + queue_used++) % queue_length] = *cmd;
}
void LFBTextBuffer::StopRendering()
{
if ( !queue_thread || emergency_state )
return;
TextBufferCmd cmd;
cmd.type = TEXTBUFCMD_PAUSE;
IssueCommand(&cmd);
ScopedLock lock(&queue_lock);
while ( !queue_is_paused )
kthread_cond_wait(&queue_paused, &queue_lock);
}
void LFBTextBuffer::ResumeRendering()
{
if ( !queue_thread || emergency_state )
return;
ScopedLock lock(&queue_lock);
queue_is_paused = false;
kthread_cond_signal(&queue_resume);
}
TextChar LFBTextBuffer::GetChar(TextPos pos) const
{
if ( UsablePosition(pos) )
{
((LFBTextBuffer*) this)->StopRendering();
TextChar ret = chars[pos.y * columns + pos.x];
((LFBTextBuffer*) this)->ResumeRendering();
return ret;
}
return {0, 0};
}
void LFBTextBuffer::SetChar(TextPos pos, TextChar c)
{
if ( !UsablePosition(pos) )
return;
TextBufferCmd cmd;
cmd.type = TEXTBUFCMD_CHAR;
cmd.x = pos.x;
cmd.y = pos.y;
cmd.c = c;
IssueCommand(&cmd);
}
uint16_t LFBTextBuffer::GetCharAttr(TextPos pos) const
{
if ( UsablePosition(pos) )
{
((LFBTextBuffer*) this)->StopRendering();
uint16_t ret = attrs[pos.y * columns + pos.x];
((LFBTextBuffer*) this)->ResumeRendering();
return ret;
}
return 0;
}
void LFBTextBuffer::SetCharAttr(TextPos pos, uint16_t attrval)
{
if ( !UsablePosition(pos) )
return;
TextBufferCmd cmd;
cmd.type = TEXTBUFCMD_ATTR;
cmd.x = pos.x;
cmd.y = pos.y;
cmd.attr = attrval;
IssueCommand(&cmd);
}
bool LFBTextBuffer::GetCursorEnabled() const
{
((LFBTextBuffer*) this)->StopRendering();
bool ret = cursorenabled;
((LFBTextBuffer*) this)->ResumeRendering();
return ret;
}
void LFBTextBuffer::SetCursorEnabled(bool enablecursor)
{
TextBufferCmd cmd;
cmd.type = TEXTBUFCMD_CURSOR_SET_ENABLED;
cmd.b = enablecursor;
IssueCommand(&cmd);
}
TextPos LFBTextBuffer::GetCursorPos() const
{
((LFBTextBuffer*) this)->StopRendering();
TextPos ret = cursorpos;
((LFBTextBuffer*) this)->ResumeRendering();
return ret;
}
void LFBTextBuffer::SetCursorPos(TextPos newcursorpos)
{
TextBufferCmd cmd;
cmd.type = TEXTBUFCMD_CURSOR_MOVE;
cmd.x = newcursorpos.x;
cmd.y = newcursorpos.y;
IssueCommand(&cmd);
}
size_t LFBTextBuffer::OffsetOfPos(TextPos pos) const
{
return pos.y * columns + pos.x;
}
void LFBTextBuffer::Scroll(ssize_t off, TextChar fillwith)
{
if ( !off )
return;
TextBufferCmd cmd;
cmd.type = TEXTBUFCMD_SCROLL;
cmd.scroll_offset = off;
cmd.c = fillwith;
IssueCommand(&cmd);
}
void LFBTextBuffer::Move(TextPos to, TextPos from, size_t numchars)
{
to = CropPosition(to);
from = CropPosition(from);
TextBufferCmd cmd;
cmd.type = TEXTBUFCMD_MOVE;
cmd.to_x = to.x;
cmd.to_y = to.y;
cmd.from_x = from.x;
cmd.from_y = from.y;
cmd.val = numchars;
IssueCommand(&cmd);
}
void LFBTextBuffer::Fill(TextPos from, TextPos to, TextChar fillwith,
uint16_t fillattr)
{
from = CropPosition(from);
to = CropPosition(to);
TextBufferCmd cmd;
cmd.type = TEXTBUFCMD_FILL;
cmd.from_x = from.x;
cmd.from_y = from.y;
cmd.to_x = to.x;
cmd.to_y = to.y;
cmd.c = fillwith;
cmd.attr = fillattr;
IssueCommand(&cmd);
}
void LFBTextBuffer::DoScroll(ssize_t off, TextChar entry)
{
bool neg = 0 < off;
size_t absoff = off < 0 ? -off : off;
if ( rows < absoff )
absoff = rows;
TextPos scrollfrom = neg ? TextPos{0, absoff} : TextPos{0, 0};
TextPos scrollto = neg ? TextPos{0, 0} : TextPos{0, absoff};
TextPos fillfrom = neg ? TextPos{0, rows-absoff} : TextPos{0, 0};
TextPos fillto = neg ? TextPos{columns-1, rows-1} : TextPos{columns-1, absoff-1};
size_t scrollchars = columns * (rows-absoff);
DoMove(scrollto, scrollfrom, scrollchars);
DoFill(fillfrom, fillto, entry, 0);
}
void LFBTextBuffer::DoMove(TextPos to, TextPos from, size_t numchars)
{
size_t dest = OffsetOfPos(to);
size_t src = OffsetOfPos(from);
if ( dest < src )
for ( size_t i = 0; i < numchars; i++ )
chars[dest + i] = chars[src + i],
attrs[dest + i] = attrs[src + i];
else if ( src < dest )
for ( size_t i = 0; i < numchars; i++ )
chars[dest + numchars-1 - i] = chars[src + numchars-1 - i],
attrs[dest + numchars-1 - i] = attrs[src + numchars-1 - i];
}
void LFBTextBuffer::DoFill(TextPos from, TextPos to, TextChar fillwith,
uint16_t fillattr)
{
size_t start = OffsetOfPos(from);
size_t end = OffsetOfPos(to);
for ( size_t i = start; i <= end; i++ )
chars[i] = fillwith,
attrs[i] = fillattr;
}
bool LFBTextBuffer::IsCommandIdempotent(const TextBufferCmd* cmd) const
{
switch ( cmd->type )
{
case TEXTBUFCMD_EXIT: return true;
case TEXTBUFCMD_SYNC: return true;
case TEXTBUFCMD_PAUSE: return true;
case TEXTBUFCMD_CHAR: return true;
case TEXTBUFCMD_ATTR: return true;
case TEXTBUFCMD_CURSOR_SET_ENABLED: return true;
case TEXTBUFCMD_CURSOR_MOVE: return true;
case TEXTBUFCMD_MOVE: return false;
case TEXTBUFCMD_FILL: return true;
case TEXTBUFCMD_SCROLL: return false;
default: return false;
}
}
void LFBTextBuffer::ExecuteCommand(TextBufferCmd* cmd,
bool& exit_requested,
bool& sync_requested,
bool& pause_requested,
TextPos& render_from,
TextPos& render_to)
{
switch ( cmd->type )
{
case TEXTBUFCMD_EXIT:
exit_requested = true;
break;
case TEXTBUFCMD_SYNC:
sync_requested = true;
break;
case TEXTBUFCMD_PAUSE:
pause_requested = true;
break;
case TEXTBUFCMD_CHAR:
{
TextPos pos(cmd->x, cmd->y);
chars[pos.y * columns + pos.x] = cmd->c;
if ( IsTextPosBeforeTextPos(pos, render_from) )
render_from = pos;
if ( IsTextPosAfterTextPos(pos, render_to) )
render_to = pos;
} break;
case TEXTBUFCMD_ATTR:
{
TextPos pos(cmd->x, cmd->y);
attrs[pos.y * columns + pos.x] = cmd->attr;
} break;
case TEXTBUFCMD_CURSOR_SET_ENABLED:
if ( cmd->b != cursorenabled )
{
cursorenabled = cmd->b;
if ( IsTextPosBeforeTextPos(cursorpos, render_from) )
render_from = cursorpos;
if ( IsTextPosAfterTextPos(cursorpos, render_to) )
render_to = cursorpos;
}
break;
case TEXTBUFCMD_CURSOR_MOVE:
{
TextPos pos(cmd->x, cmd->y);
if ( cursorpos.x != pos.x || cursorpos.y != pos.y )
{
if ( IsTextPosBeforeTextPos(cursorpos, render_from) )
render_from = cursorpos;
if ( IsTextPosAfterTextPos(cursorpos, render_to) )
render_to = cursorpos;
cursorpos = pos;
if ( IsTextPosBeforeTextPos(cursorpos, render_from) )
render_from = cursorpos;
if ( IsTextPosAfterTextPos(cursorpos, render_to) )
render_to = cursorpos;
}
} break;
case TEXTBUFCMD_MOVE:
{
TextPos to(cmd->to_x, cmd->to_y);
TextPos from(cmd->from_x, cmd->from_y);
size_t numchars = cmd->val;
DoMove(to, from, numchars);
TextPos toend = AddToPosition(to, numchars);
if ( IsTextPosBeforeTextPos(to, render_from) )
render_from = to;
if ( IsTextPosAfterTextPos(toend, render_to) )
render_to = toend;
} break;
case TEXTBUFCMD_FILL:
{
TextPos from(cmd->from_x, cmd->from_y);
TextPos to(cmd->to_x, cmd->to_y);
DoFill(from, to, cmd->c, cmd->attr);
if ( IsTextPosBeforeTextPos(from, render_from) )
render_from = from;
if ( IsTextPosAfterTextPos(to, render_to) )
render_to = to;
} break;
case TEXTBUFCMD_SCROLL:
{
ssize_t off = cmd->scroll_offset;
DoScroll(off, cmd->c);
render_from = {0, 0};
render_to = {columns-1, rows-1};
} break;
}
}
void LFBTextBuffer::RenderThread()
{
queue_is_paused = false;
size_t offset = 0;
size_t amount = 0;
bool exit_requested = false;
bool sync_requested = false;
bool pause_requested = false;
while ( true )
{
kthread_mutex_lock(&queue_lock);
if ( queue_used == queue_length && amount )
kthread_cond_signal(&queue_not_full);
queue_used -= amount;
queue_offset = (queue_offset + amount) % queue_length;
if ( !queue_used )
{
if ( exit_requested )
{
queue_thread = false;
kthread_cond_signal(&queue_exit);
kthread_mutex_unlock(&queue_lock);
return;
}
if ( sync_requested )
{
kthread_cond_signal(&queue_sync);
sync_requested = false;
}
if ( pause_requested )
{
queue_is_paused = true;
kthread_cond_signal(&queue_paused);
while ( queue_is_paused )
kthread_cond_wait(&queue_resume, &queue_lock);
pause_requested = false;
}
}
while ( !queue_used )
kthread_cond_wait(&queue_not_empty, &queue_lock);
amount = queue_used;
offset = queue_offset;
kthread_mutex_unlock(&queue_lock);
execute_amount = amount;
kthread_mutex_lock(&execute_lock);
TextPos render_from(columns - 1, rows - 1);
TextPos render_to(0, 0);
for ( size_t i = 0; i < amount; i++ )
{
TextBufferCmd* cmd = &queue[(offset + i) % queue_length];
ExecuteCommand(cmd, exit_requested, sync_requested, pause_requested, render_from, render_to);
}
kthread_mutex_unlock(&execute_lock);
if ( !IsTextPosBeforeTextPos(render_to, render_from) )
RenderRange(render_from, render_to);
}
}
bool LFBTextBuffer::EmergencyIsImpaired()
{
return !emergency_state;
}
bool LFBTextBuffer::EmergencyRecoup()
{
if ( !emergency_state )
emergency_state = true;
if ( !kthread_mutex_trylock(&queue_lock) )
return false;
kthread_mutex_unlock(&queue_lock);
if ( !kthread_mutex_trylock(&execute_lock) )
{
for ( size_t i = 0; i < execute_amount; i++ )
{
TextBufferCmd* cmd = &queue[(queue_offset + i) % queue_length];
if ( !IsCommandIdempotent(cmd) )
return false;
}
}
else
kthread_mutex_unlock(&execute_lock);
TextPos render_from(0, 0);
TextPos render_to(columns - 1, rows - 1);
for ( size_t i = 0; i < queue_used; i++ )
{
bool exit_requested = false;
bool sync_requested = false;
bool pause_requested = false;
TextBufferCmd* cmd = &queue[(queue_offset + i) % queue_length];
ExecuteCommand(cmd, exit_requested, sync_requested, pause_requested,
render_from, render_to);
}
queue_used = 0;
queue_offset = 0;
RenderRange(render_from, render_to);
return true;
}
void LFBTextBuffer::EmergencyReset()
{
// TODO: Reset everything here!
Fill(TextPos{0, 0}, TextPos{columns-1, rows-1}, TextChar{0, 0}, 0);
SetCursorPos(TextPos{0, 0});
}
} // namespace Sortix
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