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Optimize out use of sgr() by storing rendition instead (11% speedup)

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This commit is contained in:
Keith Winstein
2012-03-14 01:11:47 -04:00
parent c6c6f8bea0
commit 561a2be761
3 changed files with 18 additions and 14 deletions
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src/terminal/terminaldisplay.cc
+15 -11
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@@ -25,6 +25,12 @@ using namespace Terminal;
/* Print a new "frame" to the terminal, using ANSI/ECMA-48 escape codes. */
static const Renditions & initial_rendition( void )
{
const static Renditions blank = Renditions( 0 );
return blank;
}
std::string Display::new_frame( bool initialized, const Framebuffer &last, const Framebuffer &f ) const
{
FrameState frame( last );
@@ -67,11 +73,11 @@ std::string Display::new_frame( bool initialized, const Framebuffer &last, const
frame.append( "\033[0m\033[H\033[2J" );
initialized = false;
frame.cursor_x = frame.cursor_y = 0;
frame.current_rendition_string = "\033[0m";
frame.current_rendition = initial_rendition();
} else {
frame.cursor_x = frame.last_frame.ds.get_cursor_col();
frame.cursor_y = frame.last_frame.ds.get_cursor_row();
frame.current_rendition_string = frame.last_frame.ds.get_renditions().sgr();
frame.current_rendition = frame.last_frame.ds.get_renditions();
}
/* shortcut -- has display moved up by a certain number of lines? */
@@ -111,9 +117,9 @@ std::string Display::new_frame( bool initialized, const Framebuffer &last, const
frame.append_silent_move( f.ds.get_height() - 1, 0 );
}
if ( frame.current_rendition_string != "\033[0m" ) {
if ( !(frame.current_rendition == initial_rendition()) ) {
frame.append( "\033[0m" );
frame.current_rendition_string = "\033[0m";
frame.current_rendition = initial_rendition();
}
for ( int i = 0; i < lines_scrolled; i++ ) {
@@ -193,9 +199,9 @@ std::string Display::new_frame( bool initialized, const Framebuffer &last, const
/* have renditions changed? */
if ( (!initialized)
|| (f.ds.get_renditions().sgr() != frame.current_rendition_string) ) {
|| !(f.ds.get_renditions() == frame.current_rendition) ) {
frame.appendstring( f.ds.get_renditions().sgr() );
frame.current_rendition_string = f.ds.get_renditions().sgr();
frame.current_rendition = f.ds.get_renditions();
}
return frame.str;
@@ -217,12 +223,10 @@ void Display::put_cell( bool initialized, FrameState &frame, const Framebuffer &
frame.append_silent_move( frame.y, frame.x );
}
std::string rendition_str = cell->renditions.sgr();
if ( frame.current_rendition_string != rendition_str ) {
if ( !(frame.current_rendition == cell->renditions) ) {
/* print renditions */
frame.appendstring( rendition_str );
frame.current_rendition_string = rendition_str;
frame.appendstring( cell->renditions.sgr() );
frame.current_rendition = cell->renditions;
}
if ( cell->contents.empty() ) {