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LibVT: Make VT::Line use a Vector for storage

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This is preparation for non-destructive terminal resizing which will
require more dynamic storage for lines.
This commit is contained in:
Andreas Kling 2021-02-26 20:28:22 +01:00
parent c58570ebaf
commit b7c66233f6
5 changed files with 60 additions and 123 deletions
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83
Userland/Libraries/LibVT/Line.cpp
View file

@ -25,103 +25,52 @@
*/
#include <LibVT/Line.h>
#include <string.h>
namespace VT {
Line::Line(u16 length)
Line::Line(size_t length)
{
set_length(length);
}
Line::~Line()
{
if (m_utf32)
delete[] m_code_points.as_u32;
else
delete[] m_code_points.as_u8;
delete[] m_attributes;
}
template<typename CodepointType>
static CodepointType* create_new_code_point_array(size_t new_length, const CodepointType* old_code_points, size_t old_length)
void Line::set_length(size_t new_length)
{
auto* new_code_points = new CodepointType[new_length];
for (size_t i = 0; i < new_length; ++i)
new_code_points[i] = ' ';
if (old_code_points) {
for (size_t i = 0; i < min(old_length, new_length); ++i) {
new_code_points[i] = old_code_points[i];
}
}
delete[] old_code_points;
return new_code_points;
}
void Line::set_length(u16 new_length)
{
if (m_length == new_length)
size_t old_length = length();
if (old_length == new_length)
return;
if (m_utf32)
m_code_points.as_u32 = create_new_code_point_array<u32>(new_length, m_code_points.as_u32, m_length);
else
m_code_points.as_u8 = create_new_code_point_array<u8>(new_length, m_code_points.as_u8, m_length);
auto* new_attributes = new Attribute[new_length];
if (m_attributes) {
for (size_t i = 0; i < min(m_length, new_length); ++i)
new_attributes[i] = m_attributes[i];
}
delete[] m_attributes;
m_attributes = new_attributes;
m_length = new_length;
m_cells.resize(new_length);
}
void Line::clear(Attribute attribute)
void Line::clear(const Attribute& attribute)
{
if (m_dirty) {
for (u16 i = 0; i < m_length; ++i) {
set_code_point(i, ' ');
m_attributes[i] = attribute;
for (auto& cell : m_cells) {
cell = Cell { .code_point = ' ', .attribute = attribute };
}
return;
}
for (unsigned i = 0; i < m_length; ++i) {
if (code_point(i) != ' ')
m_dirty = true;
set_code_point(i, ' ');
}
for (unsigned i = 0; i < m_length; ++i) {
if (m_attributes[i] != attribute)
m_dirty = true;
m_attributes[i] = attribute;
for (auto& cell : m_cells) {
if (!m_dirty)
m_dirty = cell.code_point != ' ' || cell.attribute != attribute;
cell = Cell { .code_point = ' ', .attribute = attribute };
}
}
bool Line::has_only_one_background_color() const
{
if (!m_length)
if (!length())
return true;
// FIXME: Cache this result?
auto color = m_attributes[0].effective_background_color();
for (size_t i = 1; i < m_length; ++i) {
if (m_attributes[i].effective_background_color() != color)
auto color = attribute_at(0).effective_background_color();
for (size_t i = 1; i < length(); ++i) {
if (attribute_at(i).effective_background_color() != color)
return false;
}
return true;
}
void Line::convert_to_utf32()
{
VERIFY(!m_utf32);
auto* new_code_points = new u32[m_length];
for (size_t i = 0; i < m_length; ++i) {
new_code_points[i] = m_code_points.as_u8[i];
}
delete m_code_points.as_u8;
m_code_points.as_u32 = new_code_points;
m_utf32 = true;
}
}