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|
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/****************** ACUITY STUFF *******************/ |
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|
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< |
typedef struct scanbar { |
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< |
short sampr; /* sample area size (power of 2) */ |
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> |
typedef struct { |
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> |
short sampe; /* sample area size (exponent of 2) */ |
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short nscans; /* number of scanlines in this bar */ |
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int len; /* individual scanline length */ |
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– |
struct scanbar *next; /* next higher resolution scanbar */ |
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int nread; /* number of scanlines loaded */ |
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< |
/* followed by the scanline data */ |
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> |
COLOR *sdata; /* scanbar data */ |
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} SCANBAR; |
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|
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< |
#define bscan(sb,y) ((COLOR *)((sb)+1)+((y)%(sb)->nscans)*(sb)->len) |
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> |
#define bscan(sb,y) ((COLOR *)(sb)->sdata+((y)%(sb)->nscans)*(sb)->len) |
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|
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SCANBAR *rootbar; /* root scan bar (lowest resolution) */ |
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|
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return(NULL); |
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for ( ; y >= sb->nread; sb->nread++) { /* read as necessary */ |
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mysl = bscan(sb, sb->nread); |
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< |
if (sb->sampr == 1) { |
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> |
if (sb->sampe == 0) { |
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if (freadscan(mysl, sb->len, infp) < 0) { |
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fprintf(stderr, "%s: %s: scanline read error\n", |
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progname, infn); |
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exit(1); |
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} |
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} else { |
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< |
sl0 = getascan(sb->next, 2*y); |
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> |
sl0 = getascan(sb+1, 2*y); |
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if (sl0 == NULL) |
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return(NULL); |
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< |
sl1 = getascan(sb->next, 2*y+1); |
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> |
sl1 = getascan(sb+1, 2*y+1); |
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for (i = 0; i < sb->len; i++) { |
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copycolor(mysl[i], sl0[2*i]); |
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addcolor(mysl[i], sl0[2*i+1]); |
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register int x; |
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/* compute foveal y position */ |
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iy = dy = (y+.5)/numscans(&inpres)*fvyr - .5; |
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< |
if (iy >= fvyr-1) iy--; |
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> |
while (iy >= fvyr-1) iy--; |
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dy -= (double)iy; |
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for (x = 0; x < scanlen(&inpres); x++) { |
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/* compute foveal x position */ |
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ix = dx = (x+.5)/scanlen(&inpres)*fvxr - .5; |
| 249 |
< |
if (ix >= fvxr-1) ix--; |
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> |
while (ix >= fvxr-1) ix--; |
| 250 |
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dx -= (double)ix; |
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/* interpolate sample rate */ |
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sr = (1.-dy)*((1.-dx)*tsampr(ix,iy) + dx*tsampr(ix+1,iy)) + |
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double d; |
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register SCANBAR *sb0; |
| 268 |
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|
| 269 |
< |
for (sb0 = rootbar; sb0->next != NULL && sb0->next->sampr > sr; |
| 271 |
< |
sb0 = sb0->next) |
| 269 |
> |
for (sb0 = rootbar; sb0->sampe != 0 && 1<<sb0[1].sampe > sr; sb0++) |
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; |
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ascanval(col, x, y, sb0); |
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< |
if (sb0->next == NULL) /* don't extrapolate highest */ |
| 272 |
> |
if (sb0->sampe == 0) /* don't extrapolate highest */ |
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return; |
| 274 |
< |
ascanval(c1, x, y, sb0->next); |
| 275 |
< |
d = (sb0->sampr - sr)/(sb0->sampr - sb0->next->sampr); |
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> |
ascanval(c1, x, y, sb0+1); |
| 275 |
> |
d = ((1<<sb0->sampe) - sr)/(1<<sb0[1].sampe); |
| 276 |
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scalecolor(col, 1.-d); |
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scalecolor(c1, d); |
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addcolor(col, c1); |
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double dx, dy; |
| 289 |
|
int ix, iy; |
| 290 |
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|
| 291 |
< |
if (sb->sampr == 1) { /* no need to interpolate */ |
| 291 |
> |
if (sb->sampe == 0) { /* no need to interpolate */ |
| 292 |
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sl0 = getascan(sb, y); |
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copycolor(col, sl0[x]); |
| 294 |
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return; |
| 295 |
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} |
| 296 |
|
/* compute coordinates for sb */ |
| 297 |
< |
ix = dx = (x+.5)/sb->sampr - .5; |
| 297 |
> |
ix = dx = (x+.5)/(1<<sb->sampe) - .5; |
| 298 |
|
while (ix >= sb->len-1) ix--; |
| 299 |
|
dx -= (double)ix; |
| 300 |
< |
iy = dy = (y+.5)/sb->sampr - .5; |
| 301 |
< |
while (iy >= numscans(&inpres)/sb->sampr-1) iy--; |
| 300 |
> |
iy = dy = (y+.5)/(1<<sb->sampe) - .5; |
| 301 |
> |
while (iy >= (numscans(&inpres)>>sb->sampe)-1) iy--; |
| 302 |
|
dy -= (double)iy; |
| 303 |
|
/* get scanlines */ |
| 304 |
|
sl0 = getascan(sb, iy); |
| 305 |
+ |
#ifdef DEBUG |
| 306 |
|
if (sl0 == NULL) { |
| 307 |
|
fprintf(stderr, "%s: internal - cannot backspace in ascanval\n", |
| 308 |
|
progname); |
| 309 |
< |
exit(1); |
| 309 |
> |
abort(); |
| 310 |
|
} |
| 311 |
+ |
#endif |
| 312 |
|
sl1 = getascan(sb, iy+1); |
| 313 |
|
/* 2D linear interpolation */ |
| 314 |
|
copycolor(col, sl0[ix]); |
| 324 |
|
scalecolor(col, 1.-dy); |
| 325 |
|
scalecolor(c1y, dy); |
| 326 |
|
addcolor(col, c1y); |
| 327 |
+ |
for (ix = 0; ix < 3; ix++) /* make sure no negative */ |
| 328 |
+ |
if (colval(col,ix) < 0.) |
| 329 |
+ |
colval(col,ix) = 0.; |
| 330 |
|
} |
| 331 |
|
|
| 332 |
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|
| 333 |
|
SCANBAR * |
| 334 |
< |
sballoc(sr, ns, sl) /* allocate scanbar */ |
| 335 |
< |
int sr; /* sampling rate */ |
| 334 |
> |
sballoc(se, ns, sl) /* allocate scanbar */ |
| 335 |
> |
int se; /* sampling rate exponent */ |
| 336 |
|
int ns; /* number of scanlines */ |
| 337 |
|
int sl; /* original scanline length */ |
| 338 |
|
{ |
| 339 |
+ |
SCANBAR *sbarr; |
| 340 |
|
register SCANBAR *sb; |
| 341 |
|
|
| 342 |
< |
sb = (SCANBAR *)malloc(sizeof(SCANBAR)+(sl/sr)*ns*sizeof(COLOR)); |
| 342 |
> |
sbarr = sb = (SCANBAR *)malloc((se+1)*sizeof(SCANBAR)); |
| 343 |
|
if (sb == NULL) |
| 344 |
|
syserror("malloc"); |
| 345 |
< |
sb->nscans = ns; |
| 346 |
< |
sb->len = sl/sr; |
| 347 |
< |
sb->nread = 0; |
| 348 |
< |
if ((sb->sampr = sr) > 1) |
| 349 |
< |
sb->next = sballoc(sr/2, ns*2, sl); |
| 350 |
< |
else |
| 351 |
< |
sb->next = NULL; |
| 352 |
< |
return(sb); |
| 345 |
> |
do { |
| 346 |
> |
sb->sampe = se; |
| 347 |
> |
sb->len = sl>>se; |
| 348 |
> |
sb->nscans = ns; |
| 349 |
> |
sb->sdata = (COLOR *)malloc(sb->len*ns*sizeof(COLOR)); |
| 350 |
> |
if (sb->sdata == NULL) |
| 351 |
> |
syserror("malloc"); |
| 352 |
> |
sb->nread = 0; |
| 353 |
> |
ns <<= 1; |
| 354 |
> |
sb++; |
| 355 |
> |
} while (--se >= 0); |
| 356 |
> |
return(sbarr); |
| 357 |
|
} |
| 358 |
|
|
| 359 |
|
|
| 393 |
|
tsampr(x,fvyr-1) = tsampr(x,fvyr-2); |
| 394 |
|
} |
| 395 |
|
for (y = 0; y < fvyr; y++) { |
| 396 |
< |
tsampr(y,0) = tsampr(y,1); |
| 397 |
< |
tsampr(y,fvxr-1) = tsampr(y,fvxr-2); |
| 396 |
> |
tsampr(0,y) = tsampr(1,y); |
| 397 |
> |
tsampr(fvxr-1,y) = tsampr(fvxr-2,y); |
| 398 |
|
} |
| 399 |
|
/* initialize with next power of two */ |
| 400 |
< |
rootbar = sballoc(2<<(int)(log(maxsr)/log(2.)), 2, scanlen(&inpres)); |
| 400 |
> |
rootbar = sballoc((int)(log(maxsr)/log(2.))+1, 2, scanlen(&inpres)); |
| 401 |
|
} |
