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Tweaks to local predictions -- better flagging and more responsiveness

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This commit is contained in:
Keith Winstein
2012-02-02 00:50:15 -05:00
parent 72fd944de6
commit d69f27fa03
2 changed files with 70 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files
terminaloverlay.cpp
+47 -29
View File
@@ -11,7 +11,7 @@ using namespace Overlay;
bool ConditionalOverlay::start_clock( uint64_t local_frame_acked, uint64_t now )
{
if ( (local_frame_acked >= expiration_frame) && (expiration_time == uint64_t(-1)) ) {
expiration_time = now + 25;
expiration_time = now + 50;
return true;
}
return false;
@@ -30,7 +30,7 @@ void ConditionalOverlayCell::apply( Framebuffer &fb, uint64_t confirmed_epoch, i
}
if ( unknown ) {
fb.get_mutable_cell( row, col )->contents.clear();
// fb.get_mutable_cell( row, col )->contents.clear();
return;
}
@@ -45,7 +45,7 @@ void ConditionalOverlayCell::apply( Framebuffer &fb, uint64_t confirmed_epoch, i
if ( display_time >= now ) {
display_time = now;
}
if ( flag ) {
if ( flag && (!replacement.is_blank()) ) {
fb.get_mutable_cell( row, col )->renditions.underlined = true;
}
}
@@ -69,12 +69,6 @@ Validity ConditionalOverlayCell::get_validity( const Framebuffer &fb, int row, u
return Pending;
}
assert( expiration_time != uint64_t(-1) );
if ( now < expiration_time ) {
return Pending;
}
/* special case deletion */
if ( current.is_blank() && replacement.is_blank() ) {
return CorrectNoCredit;
@@ -85,10 +79,22 @@ Validity ConditionalOverlayCell::get_validity( const Framebuffer &fb, int row, u
}
if ( current.contents == replacement.contents ) {
auto it = find_if( original_contents.begin(), original_contents.end(),
[&]( const Cell &x ) { return replacement.contents == x.contents; } );
if ( it == original_contents.end() ) {
return Correct;
} else {
return IncorrectOrExpired;
return CorrectNoCredit;
}
}
assert( expiration_time != uint64_t(-1) );
if ( now < expiration_time ) {
return Pending;
}
return IncorrectOrExpired;
}
Validity ConditionalCursorMove::get_validity( const Framebuffer &fb, uint64_t current_frame, uint64_t now ) const
@@ -351,8 +357,6 @@ void PredictionEngine::cull( const Framebuffer &fb )
/* go through cell predictions */
uint64_t max_delay = 0;
auto i = overlays.begin();
while ( i != overlays.end() ) {
auto inext = i;
@@ -403,6 +407,8 @@ void PredictionEngine::cull( const Framebuffer &fb )
i->row_num, j->col,
j->replacement.debug_contents(),
fb.get_cell( i->row_num, j->col )->debug_contents() );
*/
/*
if ( j->display_time != uint64_t(-1) ) {
fprintf( stderr, "TIMING %ld - %ld\n", time(NULL), now - j->display_time );
}
@@ -421,10 +427,21 @@ void PredictionEngine::cull( const Framebuffer &fb )
if ( j->tentative_until_epoch > confirmed_epoch ) {
confirmed_epoch = j->tentative_until_epoch;
/*
fprintf( stderr, "Confirmed epoch %lu (predicting in epoch %lu)\n",
fprintf( stderr, "%lc in (%d,%d) confirms epoch %lu (predicting in epoch %lu)\n",
j->replacement.debug_contents(), i->row_num, j->col,
confirmed_epoch, prediction_epoch );
*/
}
if ( j->display_time != uint64_t(-1) ) {
if ( now - j->display_time < 75 ) {
if ( flagging > 0 ) {
flagging--;
}
}
}
/* no break */
@@ -442,7 +459,9 @@ void PredictionEngine::cull( const Framebuffer &fb )
break;
case Pending:
if ( j->display_time != uint64_t(-1) ) {
max_delay = max( max_delay, now - j->display_time );
if ( now - j->display_time >= 150 ) {
flagging = 10;
}
}
break;
default:
@@ -453,16 +472,11 @@ void PredictionEngine::cull( const Framebuffer &fb )
i = inext;
}
if ( max_delay > 100 ) {
flagging = true;
} else if ( max_delay < 50 ) {
flagging = false;
}
/* go through cursor predictions */
for ( auto it = cursors.begin(); it != cursors.end(); it++ ) {
if ( it->start_clock( local_frame_acked, now ) ) {
last_scheduled_timeout = max( last_scheduled_timeout, it->expiration_time ); }
last_scheduled_timeout = max( last_scheduled_timeout, it->expiration_time );
}
}
if ( !cursors.empty() ) {
@@ -508,10 +522,6 @@ void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
{
cull( fb );
init_cursor( fb );
assert( !cursors.empty() );
/* translate application-mode cursor control function to ANSI cursor control sequence */
if ( (last_byte == 0x1b)
&& (the_byte == 'O') ) {
@@ -532,6 +542,8 @@ void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
if ( typeid( *act ) == typeid( Parser::Print ) ) {
/* make new prediction */
init_cursor( fb );
assert( act->char_present );
wchar_t ch = act->ch;
@@ -550,10 +562,12 @@ void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
for ( int i = cursor().col; i < fb.ds.get_width(); i++ ) {
ConditionalOverlayCell &cell = the_row.overlay_cells[ i ];
cell.reset();
cell.reset_with_orig();
cell.active = true;
cell.tentative_until_epoch = prediction_epoch;
cell.expire( local_frame_sent + 1 );
cell.original_contents.push_back( *fb.get_cell( cursor().row, i ) );
if ( i + 2 < fb.ds.get_width() ) {
ConditionalOverlayCell &next_cell = the_row.overlay_cells[ i + 1 ];
@@ -596,10 +610,11 @@ void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
/* do the insert */
for ( int i = fb.ds.get_width() - 1; i > cursor().col; i-- ) {
ConditionalOverlayCell &cell = the_row.overlay_cells[ i ];
cell.reset();
cell.reset_with_orig();
cell.active = true;
cell.tentative_until_epoch = prediction_epoch;
cell.expire( local_frame_sent + 1 );
cell.original_contents.push_back( *fb.get_cell( cursor().row, i ) );
ConditionalOverlayCell &prev_cell = the_row.overlay_cells[ i - 1 ];
const Cell *prev_cell_actual = fb.get_cell( cursor().row, i - 1 );
@@ -620,13 +635,14 @@ void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
}
ConditionalOverlayCell &cell = the_row.overlay_cells[ cursor().col ];
cell.reset();
cell.reset_with_orig();
cell.active = true;
cell.tentative_until_epoch = prediction_epoch;
cell.expire( local_frame_sent + 1 );
cell.replacement.renditions = fb.ds.get_renditions();
cell.replacement.contents.clear();
cell.replacement.contents.push_back( ch );
cell.original_contents.push_back( *fb.get_cell( cursor().row, cursor().col ) );
/*
fprintf( stderr, "[%d=>%d] Predicting %lc in row %d, col %d [tue: %lu]\n",
@@ -656,11 +672,13 @@ void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
become_tentative();
} else if ( typeid( *act ) == typeid( Parser::CSI_Dispatch ) ) {
if ( act->char_present && (act->ch == L'C') ) { /* right arrow */
init_cursor( fb );
if ( cursor().col < fb.ds.get_width() - 1 ) {
cursor().col++;
cursor().expire( local_frame_sent + 1 );
}
} else if ( act->char_present && (act->ch == L'D') ) { /* left arrow */
init_cursor( fb );
ConditionalOverlayRow &the_row = get_or_make_row( cursor().row, fb.ds.get_width() );
if ( cursor().col <= the_row.first_col ) {
become_tentative();
@@ -684,6 +702,7 @@ void PredictionEngine::new_user_byte( char the_byte, const Framebuffer &fb )
void PredictionEngine::newline_carriage_return( const Framebuffer &fb )
{
init_cursor( fb );
cursor().col = 0;
if ( cursor().row == fb.ds.get_height() - 1 ) {
for ( auto i = overlays.begin(); i != overlays.end(); i++ ) {
@@ -719,7 +738,6 @@ void PredictionEngine::become_tentative( void )
prediction_epoch ) );
cursor().active = true;
}
/*
fprintf( stderr, "Now tentative in epoch %lu (confirmed=%lu)\n",
prediction_epoch, confirmed_epoch );
terminaloverlay.hpp
+21 -6
View File
@@ -62,6 +62,9 @@ namespace Overlay {
mutable uint64_t display_time;
vector<Cell> original_contents; /* we don't give credit for correct predictions
that match the original contents */
void apply( Framebuffer &fb, uint64_t confirmed_epoch, int row, bool flag ) const;
Validity get_validity( const Framebuffer &fb, int row, uint64_t current_frame, uint64_t now ) const;
@@ -69,10 +72,22 @@ namespace Overlay {
: ConditionalOverlay( s_exp, s_col, s_tentative ),
replacement( 0 ),
unknown( false ),
display_time( -1 )
display_time( uint64_t(-1) ),
original_contents()
{}
void reset( void ) { unknown = false; display_time = -1; ConditionalOverlay::reset(); }
void reset( void ) { unknown = false; display_time = uint64_t(-1); original_contents.clear(); ConditionalOverlay::reset(); }
void reset_with_orig( void ) {
if ( (!active) || unknown ) {
reset();
return;
}
vector<Cell> new_orig( original_contents );
new_orig.push_back( replacement );
reset();
original_contents = new_orig;
}
};
class ConditionalOverlayRow {
@@ -126,9 +141,9 @@ namespace Overlay {
void newline_carriage_return( const Framebuffer &fb );
bool flagging;
int flagging;
ConditionalCursorMove & cursor( void ) { return cursors.back(); }
ConditionalCursorMove & cursor( void ) { assert( !cursors.empty() ); return cursors.back(); }
void kill_epoch( uint64_t epoch, const Framebuffer &fb );
@@ -150,8 +165,8 @@ namespace Overlay {
PredictionEngine( void ) : last_byte( 0 ), parser(), overlays(), cursors(),
local_frame_sent( 0 ), local_frame_acked( 0 ),
prediction_epoch( 0 ), confirmed_epoch( 0 ),
flagging( false ), last_scheduled_timeout( 0 )
prediction_epoch( 1 ), confirmed_epoch( 0 ),
flagging( 0 ), last_scheduled_timeout( 0 )
{
}
};