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Kernel+LibVT: Implement left-right scrolling

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This commit implements the left/right scrolling used in the `ICH`/`DCH`
escape sequences for `VirtualConsole`. This brings us one step closer to
VT420/xterm compatibility.

We can now finally remove the last escape sequence related `ifdef`s.
This commit is contained in:
Daniel Bertalan 2021-06-05 15:11:45 +02:00 • committed by Andreas Kling
parent 7419569a2b
commit 89843cd692
4 changed files with 68 additions and 43 deletions
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62
Userland/Libraries/LibVT/Terminal.cpp
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@ -692,27 +692,15 @@ void Terminal::DL(Parameters params)
scroll_up(cursor_row(), m_scroll_region_bottom, count);
}
#ifndef KERNEL
void Terminal::DCH(Parameters params)
{
int num = 1;
if (params.size() >= 1 && params[0] != 0)
num = params[0];
auto& line = active_buffer()[cursor_row()];
num = min(num, static_cast<int>(line.length()) - cursor_column());
// Move n characters of line to the left
for (size_t i = cursor_column(); i < line.length() - num; i++)
line.cell_at(i) = line.cell_at(i + num);
// Fill remainder of line with blanks
for (size_t i = line.length() - num; i < line.length(); i++)
line.set_code_point(i, ' ');
line.set_dirty(true);
num = min<int>(num, columns() - cursor_column());
scroll_left(cursor_row(), cursor_column(), num);
}
#endif
void Terminal::linefeed()
{
@ -807,6 +795,36 @@ void Terminal::scroll_down(u16 region_top, u16 region_bottom, size_t count)
active_buffer()[row].set_dirty(true);
}
// Insert `count` blank cells at the end of the line. Text moves left.
void Terminal::scroll_left(u16 row, u16 column, size_t count)
{
VERIFY(row < rows());
VERIFY(column < columns());
count = min<size_t>(count, columns() - column);
dbgln_if(TERMINAL_DEBUG, "Scroll left {} columns from line {} column {}", count, row, column);
auto& line = active_buffer()[row];
for (size_t i = column; i < columns() - count; ++i)
swap(line.cell_at(i), line.cell_at(i + count));
clear_in_line(row, columns() - count, columns() - 1);
line.set_dirty(true);
}
// Insert `count` blank cells after `row`. Text moves right.
void Terminal::scroll_right(u16 row, u16 column, size_t count)
{
VERIFY(row < rows());
VERIFY(column < columns());
count = min<size_t>(count, columns() - column);
dbgln_if(TERMINAL_DEBUG, "Scroll right {} columns from line {} column {}", count, row, column);
auto& line = active_buffer()[row];
for (int i = columns() - 1; i >= static_cast<int>(column + count); --i)
swap(line.cell_at(i), line.cell_at(i - count));
clear_in_line(row, column, column + count - 1);
line.set_dirty(true);
}
void Terminal::put_character_at(unsigned row, unsigned column, u32 code_point)
{
VERIFY(row < rows());
@ -883,27 +901,15 @@ void Terminal::DSR(Parameters params)
}
}
#ifndef KERNEL
void Terminal::ICH(Parameters params)
{
unsigned num = 1;
if (params.size() >= 1 && params[0] != 0)
num = params[0];
auto& line = active_buffer()[cursor_row()];
auto max_insert = static_cast<unsigned>(line.length()) - cursor_column();
num = min(num, max_insert);
// Move characters after cursor to the right
for (int i = line.length() - num - 1; i >= cursor_column(); --i)
line.cell_at(i + num) = line.cell_at(i);
// Fill n characters after cursor with blanks
for (unsigned i = 0; i < num; ++i)
line.set_code_point(cursor_column() + i, ' ');
line.set_dirty(true);
num = min<unsigned>(num, columns() - cursor_column());
scroll_right(cursor_row(), cursor_column(), num);
}
#endif
void Terminal::on_input(u8 byte)
{