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https://github.com/RGBCube/serenity
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7419569a2b
Previously, this was done by telling the client to put a space at each character in the range. This was inefficient, because a large number of function calls took place and incorrect, as the ANSI standard dictates that character attributes should be cleared as well. The newly added `clear_in_line` function solves this issue. It performs just one bounds check when it's called and can be implemented as a pretty tight loop.
53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibVT/Line.h>
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namespace VT {
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Line::Line(size_t length)
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{
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set_length(length);
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}
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Line::~Line()
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{
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}
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void Line::set_length(size_t new_length)
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{
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size_t old_length = length();
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if (old_length == new_length)
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return;
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m_cells.resize(new_length);
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}
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void Line::clear_range(size_t first_column, size_t last_column, const Attribute& attribute)
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{
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VERIFY(first_column <= last_column);
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VERIFY(last_column < m_cells.size());
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for (size_t i = first_column; i <= last_column; ++i) {
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auto& cell = m_cells[i];
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if (!m_dirty)
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m_dirty = cell.code_point != ' ' || cell.attribute != attribute;
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cell = Cell { .code_point = ' ', .attribute = attribute };
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}
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}
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bool Line::has_only_one_background_color() const
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{
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if (!length())
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return true;
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// FIXME: Cache this result?
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auto color = attribute_at(0).effective_background_color();
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for (size_t i = 1; i < length(); ++i) {
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if (attribute_at(i).effective_background_color() != color)
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return false;
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}
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return true;
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}
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}
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