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save a system call on synchronized updates #1845

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nick black 2021-06-29 00:19:26 -04:00
parent ca556c3457
commit 3cbbbc5f77
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1 changed files with 16 additions and 5 deletions
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21
src/lib/render.c
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@ -1050,7 +1050,6 @@ rasterize_core(notcurses* nc, const ncpile* p, FILE* out, unsigned phase){
// desired; in this case, an ASU footer is present at the end of the buffer.
static int
notcurses_rasterize_inner(notcurses* nc, ncpile* p, FILE* out, unsigned* asu){
fseeko(out, 0, SEEK_SET);
// we only need to emit a coordinate if it was damaged. the damagemap is a
// bit per coordinate, one per struct crender.
// don't write a clearscreen. we only update things that have been changed.
@ -1107,24 +1106,35 @@ notcurses_rasterize_inner(notcurses* nc, ncpile* p, FILE* out, unsigned* asu){
// rasterize the rendered frame, and blockingly write it out to the terminal.
static int
raster_and_write(notcurses* nc, ncpile* p, FILE* out){
fseeko(out, 0, SEEK_SET);
// will we be using application-synchronized updates? if this comes back as
// non-zero, we are, and must emit the header. no ASU without a tty, and we
// can't have the escape without being connected to one...
const char* basu = get_escape(&nc->tcache, ESCAPE_BSU);
unsigned useasu = basu ? 1 : 0;
// if we have ASU support, emit a BSU speculatively. if we do so, but don't
// actually use an ESU, this BASU must be skipped on write.
if(useasu){
if(ncfputs(basu, out) == EOF){
return -1;
}
}
if(notcurses_rasterize_inner(nc, p, out, &useasu) < 0){
return -1;
}
int ret = 0;
sigset_t oldmask;
block_signals(&oldmask);
// if we loaded a BSU into the front, but don't actually want to use it,
// we start printing after the BSU.
size_t moffset = 0;
if(useasu){
if(tty_emit(basu, fileno(nc->ttyfp))){
ret = -1;
}
++nc->stats.appsync_updates;
}else{
moffset = strlen(basu);
}
if(blocking_write(fileno(nc->ttyfp), nc->rstate.mstream, nc->rstate.mstrsize)){
if(blocking_write(fileno(nc->ttyfp), nc->rstate.mstream + moffset,
nc->rstate.mstrsize - moffset)){
ret = -1;
}
unblock_signals(&oldmask);
@ -1366,6 +1376,7 @@ int ncpile_render_to_buffer(ncplane* p, char** buf, size_t* buflen){
}
notcurses* nc = ncplane_notcurses(p);
unsigned useacu = false; // no ACU to file
fseeko(nc->rstate.mstreamfp, 0, SEEK_SET);
int bytes = notcurses_rasterize_inner(nc, ncplane_pile(p), nc->rstate.mstreamfp, &useacu);
pthread_mutex_lock(&nc->statlock);
update_render_bytes(&nc->stats, bytes);