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LibVT: Store all-ASCII terminal lines as 8-bit characters

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To conserve memory, we now use byte storage for terminal lines until we
encounter a non-ASCII codepoint. At that point, we transparently switch
to UTF-32 storage for that one line.
This commit is contained in:
Andreas Kling 2020-05-17 11:32:31 +02:00
parent a398898c12
commit 7b5b4bee70
4 changed files with 78 additions and 26 deletions
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55
Libraries/LibVT/Line.cpp
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@ -36,27 +36,44 @@ Line::Line(u16 length)
Line::~Line()
{
delete[] m_codepoints;
if (m_utf32)
delete[] m_codepoints.as_u32;
else
delete[] m_codepoints.as_u8;
delete[] m_attributes;
}
template<typename CodepointType>
static CodepointType* create_new_codepoint_array(size_t new_length, const CodepointType* old_codepoints, size_t old_length)
{
auto* new_codepoints = new CodepointType[new_length];
for (size_t i = 0; i < new_length; ++i)
new_codepoints[i] = ' ';
if (old_codepoints) {
for (size_t i = 0; i < min(old_length, new_length); ++i) {
new_codepoints[i] = old_codepoints[i];
}
}
delete[] old_codepoints;
return new_codepoints;
}
void Line::set_length(u16 new_length)
{
if (m_length == new_length)
return;
auto* new_codepoints = new u32[new_length];
if (m_utf32)
m_codepoints.as_u32 = create_new_codepoint_array<u32>(new_length, m_codepoints.as_u32, m_length);
else
m_codepoints.as_u8 = create_new_codepoint_array<u8>(new_length, m_codepoints.as_u8, m_length);
auto* new_attributes = new Attribute[new_length];
for (size_t i = 0; i < new_length; ++i)
new_codepoints[i] = ' ';
if (m_codepoints && m_attributes) {
for (size_t i = 0; i < min(m_length, new_length); ++i) {
new_codepoints[i] = m_codepoints[i];
if (m_attributes) {
for (size_t i = 0; i < min(m_length, new_length); ++i)
new_attributes[i] = m_attributes[i];
}
}
delete[] m_codepoints;
delete[] m_attributes;
m_codepoints = new_codepoints;
m_attributes = new_attributes;
m_length = new_length;
}
@ -65,15 +82,15 @@ void Line::clear(Attribute attribute)
{
if (m_dirty) {
for (u16 i = 0; i < m_length; ++i) {
m_codepoints[i] = ' ';
set_codepoint(i, ' ');
m_attributes[i] = attribute;
}
return;
}
for (unsigned i = 0; i < m_length; ++i) {
if (m_codepoints[i] != ' ')
if (codepoint(i) != ' ')
m_dirty = true;
m_codepoints[i] = ' ';
set_codepoint(i, ' ');
}
for (unsigned i = 0; i < m_length; ++i) {
if (m_attributes[i] != attribute)
@ -95,4 +112,16 @@ bool Line::has_only_one_background_color() const
return true;
}
void Line::convert_to_utf32()
{
ASSERT(!m_utf32);
auto* new_codepoints = new u32[m_length];
for (size_t i = 0; i < m_length; ++i) {
new_codepoints[i] = m_codepoints.as_u8[i];
}
delete m_codepoints.as_u8;
m_codepoints.as_u32 = new_codepoints;
m_utf32 = true;
}
}