xfnw/plan9fox
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

libdraw: avoid BPSHORT()/BPLONG() expansion, cleanup loadchar(),cachechars()

Browse source 
assigning the expression value to a temporary variable in
BPSHORT() and BPLONG() saves arround 2K of text in rio on
arm and arround 1K on amd64.

loadchar(): use the passed in "h" as the char index instead
of recomputing it from c-f->cache. dont recompute wid.

cachechars(): do cache lookup and find oldest entry in a
single loop pass.
This commit is contained in:
cinap_lenrek 2016-04-13 00:34:48 +02:00
parent 6b989beb2f
commit 1787584ad8
3 changed files with 24 additions and 32 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
sys/include/ape/draw.h
View file

@ -512,10 +512,10 @@ extern int _cursorfd;
extern int _drawdebug; /* set to 1 to see errors from flushimage */
extern void _setdrawop(Display*, Drawop);
#define BGSHORT(p) (((p)[0]<<0) | ((p)[1]<<8))
#define BGLONG(p) ((BGSHORT(p)<<0) | (BGSHORT(p+2)<<16))
#define BPSHORT(p, v) ((p)[0]=(v), (p)[1]=((v)>>8))
#define BPLONG(p, v) (BPSHORT(p, (v)), BPSHORT(p+2, (v)>>16))
#define BGSHORT(p) ((p)[0]|((p)[1]<<8))
#define BGLONG(p) ((p)[0]|((p)[1]<<8)|((p)[2]<<16)|((p)[3]<<24))
#define BPSHORT(p,v) do{ushort _v_=(v);(p)[0]=_v_;(p)[1]=_v_>>8;}while(0)
#define BPLONG(p,v) do{ulong _v_=(v);(p)[0]=_v_;(p)[1]=_v_>>8;(p)[2]=_v_>>16;(p)[3]=_v_>>24;}while(0)
/*
* Compressed image file parameters and helper routines

8
sys/include/draw.h
View file

@ -505,10 +505,10 @@ extern int _cursorfd;
extern int _drawdebug; /* set to 1 to see errors from flushimage */
extern void _setdrawop(Display*, Drawop);
#define BGSHORT(p) (((p)[0]<<0) | ((p)[1]<<8))
#define BGLONG(p) ((BGSHORT(p)<<0) | (BGSHORT(p+2)<<16))
#define BPSHORT(p, v) ((p)[0]=(v), (p)[1]=((v)>>8))
#define BPLONG(p, v) (BPSHORT(p, (v)), BPSHORT(p+2, (v)>>16))
#define BGSHORT(p) ((p)[0]|((p)[1]<<8))
#define BGLONG(p) ((p)[0]|((p)[1]<<8)|((p)[2]<<16)|((p)[3]<<24))
#define BPSHORT(p,v) do{ushort _v_=(v);(p)[0]=_v_;(p)[1]=_v_>>8;}while(0)
#define BPLONG(p,v) do{ulong _v_=(v);(p)[0]=_v_;(p)[1]=_v_>>8;(p)[2]=_v_>>16;(p)[3]=_v_>>24;}while(0)
/*
* Compressed image file parameters and helper routines

40
sys/src/libdraw/font.c
View file

@ -10,7 +10,7 @@ static int fontresize(Font*, int, int, int);
int
cachechars(Font *f, char **ss, Rune **rr, ushort *cp, int max, int *wp, char **subfontname)
{
int i, j, th, sh, h, w, rw, wid, nc;
int i, j, h, w, rw, wid, nc;
char *sp;
Rune r, *rp, vr;
ulong a;
@ -41,32 +41,24 @@ cachechars(Font *f, char **ss, Rune **rr, ushort *cp, int max, int *wp, char **s
rw = 1;
}
sh = (17 * (uint)r) & (f->ncache-NFLOOK-1);
c = &f->cache[sh];
a = ~0;
h = (17 * (uint)r) & (f->ncache-NFLOOK-1);
c = &f->cache[h];
tc = c;
ec = c+NFLOOK;
h = sh;
while(c < ec){
if(c->value==r && c->age)
goto Found;
if(c->age < a){
a = c->age;
tc = c;
}
c++;
h++;
}
/*
* Not found; toss out oldest entry
*/
a = ~0;
th = sh;
tc = &f->cache[th];
while(tc < ec){
if(tc->age < a){
a = tc->age;
h = th;
c = tc;
}
tc++;
th++;
}
/* Not found; use oldest entry */
c = tc;
h = tc - f->cache;
if(a && (f->age-a)<500){ /* kicking out too recent; resize */
nc = 2*(f->ncache-NFLOOK) + NFLOOK;
@ -287,8 +279,6 @@ loadchar(Font *f, Rune r, Cacheinfo *c, int h, int noflush, char **subfontname)
/* c is still valid as didn't reallocate f->cache */
}
c->value = r;
top = fi->top + (f->ascent-subf->f->ascent);
bottom = fi->bottom + (f->ascent-subf->f->ascent);
c->width = fi->width;
c->x = h*f->width;
c->left = fi->left;
@ -297,13 +287,15 @@ loadchar(Font *f, Rune r, Cacheinfo *c, int h, int noflush, char **subfontname)
b = bufimage(f->display, 37);
if(b == nil)
return 0;
top = fi->top + (f->ascent-subf->f->ascent);
bottom = fi->bottom + (f->ascent-subf->f->ascent);
b[0] = 'l';
BPLONG(b+1, f->cacheimage->id);
BPLONG(b+5, subf->f->bits->id);
BPSHORT(b+9, c-f->cache);
BPSHORT(b+9, h);
BPLONG(b+11, c->x);
BPLONG(b+15, top);
BPLONG(b+19, c->x+((fi+1)->x-fi->x));
BPLONG(b+19, c->x+wid);
BPLONG(b+23, bottom);
BPLONG(b+27, fi->x);
BPLONG(b+31, fi->top);