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LibVT: Store all-ASCII terminal lines as 8-bit characters
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.
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parent
a398898c12
commit
7b5b4bee70
4 changed files with 78 additions and 26 deletions
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@ -36,27 +36,44 @@ Line::Line(u16 length)
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Line::~Line()
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{
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delete[] m_codepoints;
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if (m_utf32)
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delete[] m_codepoints.as_u32;
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else
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delete[] m_codepoints.as_u8;
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delete[] m_attributes;
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}
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template<typename CodepointType>
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static CodepointType* create_new_codepoint_array(size_t new_length, const CodepointType* old_codepoints, size_t old_length)
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{
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auto* new_codepoints = new CodepointType[new_length];
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for (size_t i = 0; i < new_length; ++i)
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new_codepoints[i] = ' ';
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if (old_codepoints) {
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for (size_t i = 0; i < min(old_length, new_length); ++i) {
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new_codepoints[i] = old_codepoints[i];
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}
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}
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delete[] old_codepoints;
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return new_codepoints;
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}
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void Line::set_length(u16 new_length)
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{
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if (m_length == new_length)
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return;
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auto* new_codepoints = new u32[new_length];
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if (m_utf32)
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m_codepoints.as_u32 = create_new_codepoint_array<u32>(new_length, m_codepoints.as_u32, m_length);
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else
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m_codepoints.as_u8 = create_new_codepoint_array<u8>(new_length, m_codepoints.as_u8, m_length);
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auto* new_attributes = new Attribute[new_length];
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for (size_t i = 0; i < new_length; ++i)
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new_codepoints[i] = ' ';
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if (m_codepoints && m_attributes) {
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for (size_t i = 0; i < min(m_length, new_length); ++i) {
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new_codepoints[i] = m_codepoints[i];
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if (m_attributes) {
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for (size_t i = 0; i < min(m_length, new_length); ++i)
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new_attributes[i] = m_attributes[i];
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}
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}
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delete[] m_codepoints;
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delete[] m_attributes;
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m_codepoints = new_codepoints;
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m_attributes = new_attributes;
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m_length = new_length;
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}
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@ -65,15 +82,15 @@ void Line::clear(Attribute attribute)
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{
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if (m_dirty) {
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for (u16 i = 0; i < m_length; ++i) {
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m_codepoints[i] = ' ';
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set_codepoint(i, ' ');
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m_attributes[i] = attribute;
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}
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return;
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}
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for (unsigned i = 0; i < m_length; ++i) {
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if (m_codepoints[i] != ' ')
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if (codepoint(i) != ' ')
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m_dirty = true;
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m_codepoints[i] = ' ';
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set_codepoint(i, ' ');
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}
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for (unsigned i = 0; i < m_length; ++i) {
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if (m_attributes[i] != attribute)
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@ -95,4 +112,16 @@ bool Line::has_only_one_background_color() const
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return true;
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}
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void Line::convert_to_utf32()
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{
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ASSERT(!m_utf32);
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auto* new_codepoints = new u32[m_length];
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for (size_t i = 0; i < m_length; ++i) {
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new_codepoints[i] = m_codepoints.as_u8[i];
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}
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delete m_codepoints.as_u8;
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m_codepoints.as_u32 = new_codepoints;
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m_utf32 = true;
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}
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}
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