ref: fb7dd4b3a868cb8987049c95bb32e6425a73c8b9
dir: /os/boot/rpcg/fblt.c/
#include <u.h>
#include <libc.h>
#include <libg.h>
#include <gnot.h>
/*
* bitblt operates a 'word' at a time.
* WBITS is the number of bits in a word
* LWBITS=log2(WBITS),
* W2L is the number of words in a long
* WMASK has bits set for the low order word of a long
* WType is a pointer to a word
*/
#ifndef WBITS
#define WBITS 32
#define LWBITS 5
#define W2L 1
#define WMASK ~0UL
typedef ulong *WType;
#endif
#define DEBUG
#ifdef TEST
/*
* globals used for testing
*/
int FORCEFORW;
int FORCEBAKW;
GBitmap *curdm, *cursm;
Point curpt;
Rectangle curr;
Fcode curf;
void *mem;
#endif
static void
gbitexplode(ulong sw, ulong *buf, int sdep, int x)
{
int j, o, q, n, nw, inc, qinc;
ulong s, dw, pix;
inc = 1 << sdep;
pix = (1 << inc) - 1;
nw = 1 << x;
n = 32 >> x;
qinc = (nw << sdep) - inc;
for(o = 32 - n; o >= 0; o -= n){
dw = 0;
s = sw >> o;
q = 0;
for(j = 0; j < n; j += inc){
dw |= (s & (pix << j)) << q;
q += qinc;
}
for(j = 0; j < x; j++)
dw |= dw << (inc << j);
*buf++ = dw;
}
}
/*
void
main(void)
{
ulong buf[128];
gbitexplode(0x7777, buf, 0, 3);
exits(0);
}
*/
void
gbitblt(GBitmap *dm, Point pt, GBitmap *sm, Rectangle r, Fcode fcode)
{
int width; /* width in bits of dst */
int wwidth; /* floor width in words */
int height; /* height in pixels minus 1 */
int sdep; /* src ldepth */
int ddep; /* dst ldepth */
int deltadep; /* diff between ldepths */
int sspan; /* words between scanlines in src */
int dspan; /* words between scanlines in dst */
int soff; /* bit offset of src start point */
int sdest; /* bit offset of src start point that matches doff when expanded */
int doff; /* bit offset of dst start point */
int delta; /* amount to shift src by */
int sign; /* of delta */
ulong *saddr;
ulong *daddr;
ulong *s;
ulong *d;
ulong mask;
ulong tmp; /* temp storage source word */
ulong sw; /* source word constructed */
ulong dw; /* dest word fetched */
ulong lmask; /* affected pixels in leftmost dst word */
ulong rmask; /* affected pixels in rightmost dst word */
int i;
int j;
ulong buf[32]; /* for expanding a source */
ulong *p; /* pointer into buf */
int spare; /* number of words already converted */
#ifdef TEST
curdm = dm;
cursm = sm;
curpt = pt;
curr = r;
curf = fcode;
#endif
gbitbltclip(&dm);
width = r.max.x - r.min.x;
if(width <= 0)
return;
height = r.max.y - r.min.y - 1;
if(height < 0)
return;
ddep = dm->ldepth;
pt.x <<= ddep;
width <<= ddep;
sdep = sm->ldepth;
r.min.x <<= sdep;
r.max.x <<= sdep;
dspan = dm->width * W2L;
sspan = sm->width * W2L;
daddr = (ulong*)((WType)dm->base
+ dm->zero*W2L + pt.y*dspan
+ (pt.x >> LWBITS));
saddr = (ulong*)((WType)sm->base
+ sm->zero*W2L + r.min.y*sspan
+ (r.min.x >> LWBITS));
doff = pt.x & (WBITS - 1);
lmask = WMASK >> doff;
rmask = (WMASK << (WBITS - ((doff+width) & (WBITS-1))))&WMASK;
if(!rmask)
rmask = WMASK;
soff = r.min.x & (WBITS-1);
wwidth = ((pt.x+width-1)>>LWBITS) - (pt.x>>LWBITS);
if(sm == dm){
#ifdef TEST
if(!FORCEBAKW &&
(FORCEFORW || sm != dm || saddr > daddr ||
(saddr == daddr && soff > doff)))
;
else{
daddr += height * dspan;
saddr += height * sspan;
sspan -= 2 * W2L * sm->width;
dspan -= 2 * W2L * dm->width;
}
#else
if(r.min.y < pt.y){ /* bottom to top */
daddr += height * dspan;
saddr += height * sspan;
sspan -= 2 * W2L * sm->width;
dspan -= 2 * W2L * dm->width;
}else if(r.min.y == pt.y && r.min.x < pt.x)
abort()/*goto right*/;
#endif
}
if(wwidth == 0) /* collapse masks for narrow cases */
lmask &= rmask;
fcode &= F;
deltadep = ddep - sdep;
sdest = doff >> deltadep;
delta = soff - sdest;
sign = 0;
if(delta < 0){
sign = 1;
delta = -delta;
}
p = 0;
for(j = 0; j <= height; j++){
d = daddr;
s = saddr;
mask = lmask;
tmp = 0;
if(!sign)
tmp = *s++;
spare = 0;
for(i = wwidth; i >= 0; i--){
if(spare)
sw = *p++;
else{
if(sign){
sw = tmp << (WBITS-delta);
tmp = *s++;
sw |= tmp >> delta;
}else{
sw = tmp << delta;
tmp = *s++;
if(delta)
sw |= tmp >> (WBITS-delta);
}
spare = 1 << deltadep;
if(deltadep >= 1){
gbitexplode(sw, buf, sdep, deltadep);
p = buf;
sw = *p++;
}
}
dw = *d;
switch(fcode){ /* ltor bit aligned */
case Zero: *d = dw & ~mask; break;
case DnorS: *d = dw ^ ((~sw | dw) & mask); break;
case DandnotS: *d = dw ^ ((sw & dw) & mask); break;
case notS: *d = dw ^ ((~sw ^ dw) & mask); break;
case notDandS: *d = dw ^ ((sw | dw) & mask); break;
case notD: *d = dw ^ mask; break;
case DxorS: *d = dw ^ (sw & mask); break;
case DnandS: *d = dw ^ ((sw | ~dw) & mask); break;
case DandS: *d = dw ^ ((~sw & dw) & mask); break;
case DxnorS: *d = dw ^ (~sw & mask); break;
case D: break;
case DornotS: *d = dw | (~sw & mask); break;
case S: *d = dw ^ ((sw ^ dw) & mask); break;
case notDorS: *d = dw ^ (~(sw & dw) & mask); break;
case DorS: *d = dw | (sw & mask); break;
case F: *d = dw | mask; break;
}
d++;
mask = WMASK;
if(i == 1)
mask = rmask;
spare--;
}
saddr += sspan;
daddr += dspan;
}
}
#ifdef TEST
void prprog(void);
GBitmap *bb1, *bb2;
ulong *src, *dst, *xdst, *xans;
int swds, dwds;
long ticks;
int timeit;
long
func(int f, long s, int sld, long d, int dld)
{
long a;
int sh, i, db, sb;
db = 1 << dld;
sb = 1 << sld;
sh = db - sb;
if(sh > 0) {
a = s;
for(i = sb; i<db; i += sb){
a <<= sb;
s |= a;
}
} else if(sh < 0)
s >>= -sh;
switch(f){
case Zero: d = 0; break;
case DnorS: d = ~(d|s); break;
case DandnotS: d = d & ~s; break;
case notS: d = ~s; break;
case notDandS: d = ~d & s; break;
case notD: d = ~d; break;
case DxorS: d = d ^ s; break;
case DnandS: d = ~(d&s); break;
case DandS: d = d & s; break;
case DxnorS: d = ~(d^s); break;
case S: d = s; break;
case DornotS: d = d | ~s; break;
case D: d = d; break;
case notDorS: d = ~d | s; break;
case DorS: d = d | s; break;
case F: d = ~0; break;
}
d &= ((1<<db)-1);
return d;
}
void
run(int fr, int to, int w, int op)
{
int i, j, f, t, fy, ty;
extern long *_clock;
fr += bb2->r.min.x;
to += bb1->r.min.x;
fy = bb2->r.min.y + 1;
ty = bb1->r.min.y + 1;
if(timeit) {
memcpy(dst, xdst, dwds * sizeof(long));
ticks -= *_clock;
gbitblt(bb1, Pt(to,ty), bb2, Rect(fr,fy,fr+w,fy+2), op);
ticks += *_clock;
return;
}
f = fr;
t = to;
memcpy(dst, xdst, dwds * sizeof(long));
for(i=0; i<w; i++) {
gbitblt(bb1, Pt(t,ty), bb2, Rect(f,fy,f+1,fy+1), op);
gbitblt(bb1, Pt(t,ty+1), bb2, Rect(f,fy+1,f+1,fy+2), op);
f++;
t++;
}
memcpy(xans, dst, dwds * sizeof(long));
memcpy(dst, xdst, dwds * sizeof(long));
gbitblt(bb1, Pt(to,ty), bb2, Rect(fr,fy,fr+w,fy+2), op);
if(memcmp(xans, dst, dwds * sizeof(long))) {
/*
* print src and dst row offset, width in bits, and forw/back
* then print for each of the four rows: the source (s),
* the dest (d), the good value of the answer (g),
* and the actual bad value of the answer (b)
*/
print("fr=%d to=%d w=%d fb=%d%d\n",
fr, to, w, FORCEFORW, FORCEBAKW);
print("dst bitmap b %#lux, z %d, w %d, ld %d, r [%d,%d][%d,%d]\n",
bb1->base, bb1->zero, bb1->width, bb1->ldepth,
bb1->r.min.x, bb1->r.min.y, bb1->r.max.x, bb1->r.max.y);
print("src bitmap b %#lux, z %d, w %d, ld %d, r [%d,%d][%d,%d]\n",
bb2->base, bb2->zero, bb2->width, bb2->ldepth,
bb2->r.min.x, bb2->r.min.y, bb2->r.max.x, bb2->r.max.y);
for(j=0; 7*j < dwds; j++) {
print("\ns");
for(i=0; i<7 && 7*j+i < dwds; i++)
print(" %.8lux", src[7*j + i]);
print("\nd");
for(i=0; i<7 && 7*j+i < dwds; i++)
print(" %.8lux", xdst[7*j + i]);
print("\ng");
for(i=0; i<7 && 7*j+i < dwds; i++)
print(" %.8lux", xans[7*j + i]);
print("\nb");
for(i=0; i<7 && 7*j+i < dwds; i++)
print(" %.8lux", dst[7*j + i]);
print("\n");
}
prprog();
}
}
void
prprog(void)
{
exits(0);
}
int
main(int argc, char *argv[])
{
int f, t, w, i, sld, dld, op, iters, simple;
ulong s, d, spix, dpix, apix, fpix, m, *ps, *pd;
Point sorg, dorg;
GBitmap *bs, *bd;
long seed;
char *ct;
sld = 0;
dld = 0;
timeit = 0;
iters = 200;
simple = 0;
ARGBEGIN {
case 'i':
iters = atoi(ARGF());
break;
case 's':
simple = 1;
break;
case 't':
timeit = 1;
ct = ARGF();
if(ct)
iters = atoi(ct);
break;
} ARGEND
if(argc > 0)
sld = atoi(argv[0]);
if(argc > 1)
dld = atoi(argv[1]);
if(!timeit && !simple) {
seed = time(0);
print("seed %lux\n", seed); srand(seed); /**/
}
print("sld %d dld %d\n", sld, dld);
op = 1;
/* bitmaps for 1-bit tests */
bd = gballoc(Rect(0,0,32,1), dld);
bs = gballoc(Rect(0,0,32,1), sld);
for(i=0; i<bs->width; i++)
bs->base[i] = lrand();
/* bitmaps for rect tests */
if(simple) {
dorg = Pt(0,0);
sorg = Pt(0,0);
} else {
dorg = Pt(nrand(63)-31,nrand(63)-31);
sorg = Pt(nrand(63)-31,nrand(63)-31);
}
bb1 = gballoc(Rpt(dorg,add(dorg,Pt(200,4))), dld);
bb2 = gballoc(Rpt(sorg,add(sorg,Pt(200,4))), sld);
dwds = bb1->width * Dy(bb1->r);
swds = bb2->width * Dy(bb2->r);
dst = bb1->base;
src = bb2->base;
xdst = malloc(dwds * sizeof(long));
xans = malloc(dwds * sizeof(long));
for(i=0; i<swds; i++)
src[i] = lrand();
for(i=0; i<dwds; i++)
xdst[i] = lrand();
loop:
print("Op %d\n", op);
if(!timeit) {
print("one pixel\n");
ps = bs->base;
pd = bd->base;
FORCEFORW = 1;
FORCEBAKW = 0;
for(i=0; i<1000; i++, FORCEFORW = !FORCEFORW, FORCEBAKW = !FORCEBAKW) {
f = nrand(32 >> sld);
t = nrand(32 >> dld);
s = lrand();
d = lrand();
ps[0] = s;
pd[0] = d;
#ifdef T386
spix = (byterev(s) >> (32 - ((f+1)<<sld))) & ((1 << (1<<sld)) - 1);
dpix = (byterev(d) >> (32 - ((t+1)<<dld))) & ((1 << (1<<dld)) - 1);
#else
spix = (s >> (32 - ((f+1)<<sld))) & ((1 << (1<<sld)) - 1);
dpix = (d >> (32 - ((t+1)<<dld))) & ((1 << (1<<dld)) - 1);
#endif
#ifdef T386
apix = byterev(func(op, spix, sld, dpix, dld) << (32 - ((t+1)<<dld)));
#else
apix = func(op, spix, sld, dpix, dld) << (32 - ((t+1)<<dld));
#endif
gbitblt(bd, Pt(t,0), bs, Rect(f,0,f+1,1), op);
if(ps[0] != s) {
print("bb src %.8lux %.8lux %d %d\n", ps[0], s, f, t);
exits("error");
}
m = ((1 << (1<<dld)) - 1) << (32 - ((t+1)<<dld));
#ifdef T386
m = byterev(m);
#endif
if((pd[0] & ~m) != (d & ~m)) {
print("bb dst1 %.8lux %.8lux\n",
s, d);
print("bb %.8lux %.8lux %d %d\n",
ps[0], pd[0], f, t);
prprog();
exits("error");
}
if((pd[0] & m) != apix) {
spix <<= 32 - ((f+1)<<sld);
dpix <<= 32 - ((t+1)<<dld);
#ifdef T386
spix = byterev(spix);
dpix = byterev(dpix);
#endif
print("bb dst2 %.8lux %.8lux\n",
s, d);
print("bb %.8lux %.8lux %d %d\n",
ps[0], pd[0], f, t);
print("bb %.8lux %.8lux %.8lux %.8lux\n",
spix, dpix, apix, pd[0] & m);
prprog();
exits("error");
}
}
}
print("for\n");
FORCEFORW = 1;
FORCEBAKW = 0;
for(i=0; i<iters; i++) {
f = nrand(64);
t = nrand(64);
w = nrand(130);
run(f, t, w, op);
}
if(sld == dld) {
print("bak\n");
FORCEFORW = 0;
FORCEBAKW = 1;
for(i=0; i<iters; i++) {
f = nrand(64);
t = nrand(64);
w = nrand(130);
run(f, t, w, op);
}
}
if(op < F) {
op++;
goto loop;
}
if(timeit)
print("time: %d ticks\n", ticks);
exits(0);
}
#endif