| 1 |
greg |
3.1 |
/* Copyright (c) 1996 Regents of the University of California */ |
| 2 |
|
|
|
| 3 |
|
|
#ifndef lint |
| 4 |
|
|
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
|
|
#endif |
| 6 |
|
|
|
| 7 |
|
|
/* |
| 8 |
|
|
* Routines for veiling glare and loss of acuity. |
| 9 |
|
|
*/ |
| 10 |
|
|
|
| 11 |
|
|
#include "pcond.h" |
| 12 |
|
|
|
| 13 |
|
|
|
| 14 |
|
|
#define VADAPT 0.08 /* fraction of adaptation from veil */ |
| 15 |
|
|
|
| 16 |
|
|
extern COLOR *fovimg; /* foveal (1 degree) averaged image */ |
| 17 |
|
|
extern short fvxr, fvyr; /* foveal image resolution */ |
| 18 |
|
|
|
| 19 |
|
|
#define fovscan(y) (fovimg+(y)*fvxr) |
| 20 |
|
|
|
| 21 |
|
|
static COLOR *veilimg; /* veiling image */ |
| 22 |
|
|
|
| 23 |
|
|
#define veilscan(y) (veilimg+(y)*fvxr) |
| 24 |
|
|
|
| 25 |
|
|
static FVECT *raydir = NULL; /* ray direction for each pixel */ |
| 26 |
|
|
|
| 27 |
|
|
#define rdirscan(y) (raydir+(y)*fvxr) |
| 28 |
|
|
|
| 29 |
|
|
|
| 30 |
|
|
compraydir() /* compute ray directions */ |
| 31 |
|
|
{ |
| 32 |
|
|
FVECT rorg; |
| 33 |
|
|
double h, v; |
| 34 |
|
|
register int x, y; |
| 35 |
|
|
|
| 36 |
|
|
if (raydir != NULL) /* already done? */ |
| 37 |
|
|
return; |
| 38 |
|
|
raydir = (FVECT *)malloc(fvxr*fvyr*sizeof(FVECT)); |
| 39 |
|
|
if (raydir == NULL) |
| 40 |
|
|
syserror("malloc"); |
| 41 |
|
|
|
| 42 |
|
|
for (y = 0; y < fvyr; y++) { |
| 43 |
|
|
switch (inpres.or) { |
| 44 |
|
|
case YMAJOR: case YMAJOR|XDECR: |
| 45 |
|
|
v = (y+.5)/fvyr; break; |
| 46 |
|
|
case YMAJOR|YDECR: case YMAJOR|YDECR|XDECR: |
| 47 |
|
|
v = 1. - (y+.5)/fvyr; break; |
| 48 |
|
|
case 0: case YDECR: |
| 49 |
|
|
h = (y+.5)/fvyr; break; |
| 50 |
|
|
case XDECR: case XDECR|YDECR: |
| 51 |
|
|
h = 1. - (y+.5)/fvyr; break; |
| 52 |
|
|
} |
| 53 |
|
|
for (x = 0; x < fvxr; x++) { |
| 54 |
|
|
switch (inpres.or) { |
| 55 |
|
|
case YMAJOR: case YMAJOR|YDECR: |
| 56 |
|
|
h = (x+.5)/fvxr; break; |
| 57 |
|
|
case YMAJOR|XDECR: case YMAJOR|XDECR|YDECR: |
| 58 |
|
|
h = 1. - (x+.5)/fvxr; break; |
| 59 |
|
|
case 0: case XDECR: |
| 60 |
|
|
v = (x+.5)/fvxr; break; |
| 61 |
|
|
case YDECR: case YDECR|XDECR: |
| 62 |
|
|
v = 1. - (x+.5)/fvxr; break; |
| 63 |
|
|
} |
| 64 |
|
|
if (viewray(rorg, rdirscan(y)[x], &ourview, h, v) |
| 65 |
|
|
< -FTINY) { |
| 66 |
|
|
rdirscan(y)[x][0] = |
| 67 |
|
|
rdirscan(y)[x][1] = |
| 68 |
|
|
rdirscan(y)[x][2] = 0.0; |
| 69 |
|
|
} |
| 70 |
|
|
} |
| 71 |
|
|
} |
| 72 |
|
|
} |
| 73 |
|
|
|
| 74 |
|
|
|
| 75 |
|
|
compveil() /* compute veiling image */ |
| 76 |
|
|
{ |
| 77 |
|
|
double t2, t2sum; |
| 78 |
|
|
COLOR ctmp, vsum; |
| 79 |
|
|
int px, py; |
| 80 |
|
|
register int x, y; |
| 81 |
|
|
/* compute ray directions */ |
| 82 |
|
|
compraydir(); |
| 83 |
|
|
/* compute veil image */ |
| 84 |
|
|
veilimg = (COLOR *)malloc(fvxr*fvyr*sizeof(COLOR)); |
| 85 |
|
|
if (veilimg == NULL) |
| 86 |
|
|
syserror("malloc"); |
| 87 |
|
|
for (py = 0; py < fvyr; py++) |
| 88 |
|
|
for (px = 0; px < fvxr; px++) { |
| 89 |
|
|
t2sum = 0.; |
| 90 |
|
|
setcolor(vsum, 0., 0., 0.); |
| 91 |
|
|
for (y = 0; y < fvyr; y++) |
| 92 |
|
|
for (x = 0; x < fvxr; x++) { |
| 93 |
|
|
if (x == px && y == py) continue; |
| 94 |
|
|
t2 = DOT(rdirscan(py)[px], |
| 95 |
|
|
rdirscan(y)[x]); |
| 96 |
|
|
if (t2 <= FTINY) continue; |
| 97 |
|
|
t2 = acos(t2); |
| 98 |
|
|
t2 = 1./(t2*t2); |
| 99 |
|
|
copycolor(ctmp, fovscan(y)[x]); |
| 100 |
|
|
scalecolor(ctmp, t2); |
| 101 |
|
|
addcolor(vsum, ctmp); |
| 102 |
|
|
t2sum += t2; |
| 103 |
|
|
} |
| 104 |
|
|
/* VADAPT of original is subtracted in addveil() */ |
| 105 |
|
|
scalecolor(vsum, VADAPT/t2sum); |
| 106 |
|
|
copycolor(veilscan(py)[px], vsum); |
| 107 |
|
|
} |
| 108 |
|
|
} |
| 109 |
|
|
|
| 110 |
|
|
|
| 111 |
|
|
addveil(sl, y) /* add veil to scanline */ |
| 112 |
|
|
COLOR *sl; |
| 113 |
|
|
int y; |
| 114 |
|
|
{ |
| 115 |
|
|
int vx, vy; |
| 116 |
|
|
double dx, dy; |
| 117 |
|
|
double lv, uv; |
| 118 |
|
|
register int x, i; |
| 119 |
|
|
|
| 120 |
|
|
vy = dy = (y+.5)/numscans(&inpres)*fvyr - .5; |
| 121 |
|
|
if (vy >= fvyr-1) vy--; |
| 122 |
|
|
dy -= (double)vy; |
| 123 |
|
|
for (x = 0; x < scanlen(&inpres); x++) { |
| 124 |
|
|
vx = dx = (x+.5)/scanlen(&inpres)*fvxr - .5; |
| 125 |
|
|
if (vx >= fvxr-1) vx--; |
| 126 |
|
|
dx -= (double)vx; |
| 127 |
|
|
for (i = 0; i < 3; i++) { |
| 128 |
|
|
lv = (1.-dy)*colval(veilscan(vy)[vx],i) + |
| 129 |
|
|
dy*colval(veilscan(vy+1)[vx],i); |
| 130 |
|
|
uv = (1.-dy)*colval(veilscan(vy)[vx+1],i) + |
| 131 |
|
|
dy*colval(veilscan(vy+1)[vx+1],i); |
| 132 |
|
|
colval(sl[x],i) = (1.-VADAPT)*colval(sl[x],i) + |
| 133 |
|
|
(1.-dx)*lv + dx*uv; |
| 134 |
|
|
} |
| 135 |
|
|
} |
| 136 |
|
|
} |
