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Reduce amount of SGR escapes emitted by tracking the active face

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This commit is contained in:
Maxime Coste 2020-03-29 13:35:42 +11:00
parent 63310370f8
commit b0dcb07540
2 changed files with 46 additions and 23 deletions
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66
src/terminal_ui.cc
View File

@ -179,29 +179,53 @@ void TerminalUI::Window::draw(DisplayCoord pos,
lines[(int)pos.line].append({}, size.column - pos.column, default_face);
}
void TerminalUI::Screen::set_face(const Face& face)
{
static constexpr int fg_table[]{ 39, 30, 31, 32, 33, 34, 35, 36, 37, 90, 91, 92, 93, 94, 95, 96, 97 };
static constexpr int bg_table[]{ 49, 40, 41, 42, 43, 44, 45, 46, 47, 100, 101, 102, 103, 104, 105, 106, 107 };
static constexpr int attr_table[]{ 0, 4, 7, 5, 1, 2, 3 };
auto set_color = [](bool fg, const Color& color, bool join) {
if (join)
fputs(";", stdout);
if (color.isRGB())
printf("%d;2;%d;%d;%d", fg ? 38 : 48, color.r, color.g, color.b);
else
printf("%d", (fg ? fg_table : bg_table)[(int)(char)color.color]);
};
if (m_active_face == face)
return;
fputs("\033[", stdout);
bool join = false;
if (face.attributes != m_active_face.attributes)
{
for (int i = 0; i < sizeof(attr_table) / sizeof(int); ++i)
{
if (face.attributes & (Attribute)(1 << i))
printf(";%d", attr_table[i]);
}
m_active_face = Face{{}, {}, face.attributes};
join = true;
}
if (m_active_face.fg != face.fg)
{
set_color(true, face.fg, join);
join = true;
}
if (m_active_face.bg != face.bg)
set_color(false, face.bg, join);
fputs("m", stdout);
m_active_face = face;
}
void TerminalUI::Screen::output(bool force)
{
if (lines.empty())
return;
static constexpr int fg_table[]{ 39, 30, 31, 32, 33, 34, 35, 36, 37, 90, 91, 92, 93, 94, 95, 96, 97 };
static constexpr int bg_table[]{ 49, 40, 41, 42, 43, 44, 45, 46, 47, 100, 101, 102, 103, 104, 105, 106, 107 };
static constexpr int attr_table[]{ 0, 4, 7, 5, 1, 2, 3 };
auto set_color = [](bool fg, const Color& color) {
if (color.isRGB())
printf(";%d;2;%d;%d;%d", fg ? 38 : 48, color.r, color.g, color.b);
else
printf(";%d", (fg ? fg_table : bg_table)[(int)(char)color.color]);
};
auto set_attributes = [](const Attribute& attributes) {
for (int i = 0; i < sizeof(attr_table) / sizeof(int); ++i)
{
if (attributes & (Attribute)(1 << i))
printf(";%d", attr_table[i]);
}
};
struct Change { int keep; int add; int del; };
Vector<Change> changes{Change{}};
auto new_hashes = lines | transform([](auto& line) { return hash_value(line.atoms); }) | gather<Vector>();
@ -254,11 +278,7 @@ void TerminalUI::Screen::output(bool force)
printf("\033[%dC", (int)pending_move);
pending_move = 0;
}
fputs("\033[", stdout);
set_attributes(atom.face.attributes);
set_color(true, atom.face.fg);
set_color(false, atom.face.bg);
fputs("m", stdout);
set_face(atom.face);
fputs(atom.text.c_str(), stdout);
if (atom.skip > 0)
{

3
src/terminal_ui.hh
View File

@ -89,7 +89,10 @@ private:
struct Screen : Window
{
void output(bool force);
void set_face(const Face& face);
Vector<size_t> hashes;
Face m_active_face;
};
Window m_window;