1 |
greg |
3.1 |
#ifndef lint |
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schorsch |
3.17 |
static const char RCSid[] = "$Id: pcond4.c,v 3.16 2003/02/22 02:07:27 greg Exp $"; |
3 |
greg |
3.1 |
#endif |
4 |
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/* |
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* Routines for veiling glare and loss of acuity. |
6 |
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*/ |
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#include "pcond.h" |
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greg |
3.3 |
/************** VEILING STUFF *****************/ |
11 |
greg |
3.1 |
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12 |
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#define VADAPT 0.08 /* fraction of adaptation from veil */ |
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greg |
3.11 |
static COLOR *veilimg = NULL; /* veiling image */ |
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greg |
3.1 |
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#define veilscan(y) (veilimg+(y)*fvxr) |
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greg |
3.2 |
static float (*raydir)[3] = NULL; /* ray direction for each pixel */ |
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greg |
3.1 |
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#define rdirscan(y) (raydir+(y)*fvxr) |
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schorsch |
3.17 |
static void compraydir(void); |
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#if ADJ_VEIL |
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static void smoothveil(void); |
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#endif |
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greg |
3.1 |
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schorsch |
3.17 |
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static void |
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compraydir(void) /* compute ray directions */ |
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greg |
3.1 |
{ |
31 |
greg |
3.2 |
FVECT rorg, rdir; |
32 |
greg |
3.1 |
double h, v; |
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register int x, y; |
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if (raydir != NULL) /* already done? */ |
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return; |
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greg |
3.2 |
raydir = (float (*)[3])malloc(fvxr*fvyr*3*sizeof(float)); |
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greg |
3.1 |
if (raydir == NULL) |
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syserror("malloc"); |
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for (y = 0; y < fvyr; y++) { |
42 |
greg |
3.16 |
switch (inpres.rt) { |
43 |
greg |
3.1 |
case YMAJOR: case YMAJOR|XDECR: |
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v = (y+.5)/fvyr; break; |
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case YMAJOR|YDECR: case YMAJOR|YDECR|XDECR: |
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v = 1. - (y+.5)/fvyr; break; |
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case 0: case YDECR: |
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h = (y+.5)/fvyr; break; |
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case XDECR: case XDECR|YDECR: |
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h = 1. - (y+.5)/fvyr; break; |
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} |
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for (x = 0; x < fvxr; x++) { |
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greg |
3.16 |
switch (inpres.rt) { |
54 |
greg |
3.1 |
case YMAJOR: case YMAJOR|YDECR: |
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h = (x+.5)/fvxr; break; |
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case YMAJOR|XDECR: case YMAJOR|XDECR|YDECR: |
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h = 1. - (x+.5)/fvxr; break; |
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case 0: case XDECR: |
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v = (x+.5)/fvxr; break; |
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case YDECR: case YDECR|XDECR: |
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v = 1. - (x+.5)/fvxr; break; |
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} |
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greg |
3.2 |
if (viewray(rorg, rdir, &ourview, h, v) |
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>= -FTINY) { |
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rdirscan(y)[x][0] = rdir[0]; |
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rdirscan(y)[x][1] = rdir[1]; |
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rdirscan(y)[x][2] = rdir[2]; |
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} else { |
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greg |
3.1 |
rdirscan(y)[x][0] = |
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rdirscan(y)[x][1] = |
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rdirscan(y)[x][2] = 0.0; |
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} |
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} |
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} |
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} |
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schorsch |
3.17 |
extern void |
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compveil(void) /* compute veiling image */ |
80 |
greg |
3.1 |
{ |
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double t2, t2sum; |
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COLOR ctmp, vsum; |
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int px, py; |
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register int x, y; |
85 |
greg |
3.11 |
|
86 |
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if (veilimg != NULL) /* already done? */ |
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return; |
88 |
greg |
3.1 |
/* compute ray directions */ |
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compraydir(); |
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/* compute veil image */ |
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veilimg = (COLOR *)malloc(fvxr*fvyr*sizeof(COLOR)); |
92 |
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if (veilimg == NULL) |
93 |
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syserror("malloc"); |
94 |
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for (py = 0; py < fvyr; py++) |
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for (px = 0; px < fvxr; px++) { |
96 |
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t2sum = 0.; |
97 |
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setcolor(vsum, 0., 0., 0.); |
98 |
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for (y = 0; y < fvyr; y++) |
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for (x = 0; x < fvxr; x++) { |
100 |
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if (x == px && y == py) continue; |
101 |
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t2 = DOT(rdirscan(py)[px], |
102 |
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rdirscan(y)[x]); |
103 |
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if (t2 <= FTINY) continue; |
104 |
greg |
3.4 |
/* use approximation instead |
105 |
greg |
3.12 |
t3 = acos(t2); |
106 |
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t2 = t2/(t3*t3); |
107 |
greg |
3.4 |
*/ |
108 |
greg |
3.12 |
t2 *= .5 / (1. - t2); |
109 |
greg |
3.1 |
copycolor(ctmp, fovscan(y)[x]); |
110 |
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scalecolor(ctmp, t2); |
111 |
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addcolor(vsum, ctmp); |
112 |
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t2sum += t2; |
113 |
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} |
114 |
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/* VADAPT of original is subtracted in addveil() */ |
115 |
gregl |
3.15 |
if (t2sum > FTINY) |
116 |
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scalecolor(vsum, VADAPT/t2sum); |
117 |
greg |
3.1 |
copycolor(veilscan(py)[px], vsum); |
118 |
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} |
119 |
greg |
3.11 |
/* modify FOV sample image */ |
120 |
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for (y = 0; y < fvyr; y++) |
121 |
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for (x = 0; x < fvxr; x++) { |
122 |
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scalecolor(fovscan(y)[x], 1.-VADAPT); |
123 |
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addcolor(fovscan(y)[x], veilscan(y)[x]); |
124 |
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} |
125 |
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comphist(); /* recompute histogram */ |
126 |
greg |
3.1 |
} |
127 |
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128 |
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129 |
greg |
3.16 |
#if ADJ_VEIL |
130 |
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/* |
131 |
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* The following veil adjustment was added to compensate for |
132 |
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* the fact that contrast reduction gets confused with veil |
133 |
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* in the human visual system. Therefore, we reduce the |
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* veil in portions of the image where our mapping has |
135 |
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* already reduced contrast below the target value. |
136 |
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* This gets called after the intial veil has been computed |
137 |
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* and added to the foveal image, and the mapping has been |
138 |
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* determined. |
139 |
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*/ |
140 |
schorsch |
3.17 |
extern void |
141 |
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adjveil(void) /* adjust veil image */ |
142 |
greg |
3.16 |
{ |
143 |
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float *crfptr = crfimg; |
144 |
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COLOR *fovptr = fovimg; |
145 |
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COLOR *veilptr = veilimg; |
146 |
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double s2nits = 1./inpexp; |
147 |
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double vl, vl2, fovl, vlsum; |
148 |
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double deltavc[3]; |
149 |
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int i, j; |
150 |
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151 |
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if (lumf == rgblum) |
152 |
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s2nits *= WHTEFFICACY; |
153 |
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154 |
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for (i = fvxr*fvyr; i--; crfptr++, fovptr++, veilptr++) { |
155 |
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if (crfptr[0] >= 0.95) |
156 |
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continue; |
157 |
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vl = plum(veilptr[0]); |
158 |
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fovl = (plum(fovptr[0]) - vl) * (1./(1.-VADAPT)); |
159 |
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if (vl <= 0.05*fovl) |
160 |
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continue; |
161 |
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vlsum = vl; |
162 |
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for (j = 2; j < 11; j++) { |
163 |
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vlsum += crfptr[0]*vl - (1.0 - crfptr[0])*fovl; |
164 |
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vl2 = vlsum / (double)j; |
165 |
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if (vl2 < 0.0) |
166 |
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vl2 = 0.0; |
167 |
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crfptr[0] = crfactor(fovl + vl2); |
168 |
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} |
169 |
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/* desaturation code causes color fringes at this level */ |
170 |
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for (j = 3; j--; ) { |
171 |
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double vc = colval(veilptr[0],j); |
172 |
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double fovc = (colval(fovptr[0],j) - vc) * |
173 |
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(1./(1.-VADAPT)); |
174 |
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deltavc[j] = (1.-crfptr[0])*(fovl/s2nits - fovc); |
175 |
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if (vc + deltavc[j] < 0.0) |
176 |
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break; |
177 |
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} |
178 |
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if (j < 0) |
179 |
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addcolor(veilptr[0], deltavc); |
180 |
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else |
181 |
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scalecolor(veilptr[0], vl2/vl); |
182 |
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} |
183 |
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smoothveil(); /* smooth our result */ |
184 |
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} |
185 |
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186 |
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187 |
schorsch |
3.17 |
static void |
188 |
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smoothveil(void) /* smooth veil image */ |
189 |
greg |
3.16 |
{ |
190 |
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COLOR *nveilimg; |
191 |
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COLOR *ovptr, *nvptr; |
192 |
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int x, y, i; |
193 |
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194 |
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nveilimg = (COLOR *)malloc(fvxr*fvyr*sizeof(COLOR)); |
195 |
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if (nveilimg == NULL) |
196 |
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return; |
197 |
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for (y = 1; y < fvyr-1; y++) { |
198 |
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ovptr = veilimg + y*fvxr + 1; |
199 |
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nvptr = nveilimg + y*fvxr + 1; |
200 |
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for (x = 1; x < fvxr-1; x++, ovptr++, nvptr++) |
201 |
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for (i = 3; i--; ) |
202 |
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nvptr[0][i] = 0.5 * ovptr[0][i] |
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+ (1./12.) * |
204 |
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(ovptr[-1][i] + ovptr[-fvxr][i] + |
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ovptr[1][i] + ovptr[fvxr][i]) |
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+ (1./24.) * |
207 |
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(ovptr[-fvxr-1][i] + ovptr[-fvxr+1][i] + |
208 |
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ovptr[fvxr-1][i] + ovptr[fvxr+1][i]); |
209 |
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} |
210 |
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ovptr = veilimg + 1; |
211 |
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nvptr = nveilimg + 1; |
212 |
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for (x = 1; x < fvxr-1; x++, ovptr++, nvptr++) |
213 |
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for (i = 3; i--; ) |
214 |
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nvptr[0][i] = 0.5 * ovptr[0][i] |
215 |
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+ (1./9.) * |
216 |
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(ovptr[-1][i] + ovptr[1][i] + ovptr[fvxr][i]) |
217 |
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+ (1./12.) * |
218 |
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(ovptr[fvxr-1][i] + ovptr[fvxr+1][i]); |
219 |
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ovptr = veilimg + (fvyr-1)*fvxr + 1; |
220 |
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nvptr = nveilimg + (fvyr-1)*fvxr + 1; |
221 |
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for (x = 1; x < fvxr-1; x++, ovptr++, nvptr++) |
222 |
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for (i = 3; i--; ) |
223 |
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nvptr[0][i] = 0.5 * ovptr[0][i] |
224 |
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+ (1./9.) * |
225 |
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(ovptr[-1][i] + ovptr[1][i] + ovptr[-fvxr][i]) |
226 |
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+ (1./12.) * |
227 |
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(ovptr[-fvxr-1][i] + ovptr[-fvxr+1][i]); |
228 |
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ovptr = veilimg + fvxr; |
229 |
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nvptr = nveilimg + fvxr; |
230 |
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for (y = 1; y < fvyr-1; y++, ovptr += fvxr, nvptr += fvxr) |
231 |
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for (i = 3; i--; ) |
232 |
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nvptr[0][i] = 0.5 * ovptr[0][i] |
233 |
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+ (1./9.) * |
234 |
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(ovptr[-fvxr][i] + ovptr[1][i] + ovptr[fvxr][i]) |
235 |
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+ (1./12.) * |
236 |
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(ovptr[-fvxr+1][i] + ovptr[fvxr+1][i]); |
237 |
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ovptr = veilimg + fvxr - 1; |
238 |
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nvptr = nveilimg + fvxr - 1; |
239 |
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for (y = 1; y < fvyr-1; y++, ovptr += fvxr, nvptr += fvxr) |
240 |
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for (i = 3; i--; ) |
241 |
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nvptr[0][i] = 0.5 * ovptr[0][i] |
242 |
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+ (1./9.) * |
243 |
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(ovptr[-fvxr][i] + ovptr[-1][i] + ovptr[fvxr][i]) |
244 |
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+ (1./12.) * |
245 |
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(ovptr[-fvxr-1][i] + ovptr[fvxr-1][i]); |
246 |
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for (i = 3; i--; ) { |
247 |
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nveilimg[0][i] = veilimg[0][i]; |
248 |
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nveilimg[fvxr-1][i] = veilimg[fvxr-1][i]; |
249 |
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nveilimg[(fvyr-1)*fvxr][i] = veilimg[(fvyr-1)*fvxr][i]; |
250 |
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nveilimg[fvyr*fvxr-1][i] = veilimg[fvyr*fvxr-1][i]; |
251 |
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} |
252 |
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free((void *)veilimg); |
253 |
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veilimg = nveilimg; |
254 |
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} |
255 |
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#endif |
256 |
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257 |
schorsch |
3.17 |
extern void |
258 |
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addveil( /* add veil to scanline */ |
259 |
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COLOR *sl, |
260 |
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int y |
261 |
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) |
262 |
greg |
3.1 |
{ |
263 |
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int vx, vy; |
264 |
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double dx, dy; |
265 |
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double lv, uv; |
266 |
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register int x, i; |
267 |
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268 |
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vy = dy = (y+.5)/numscans(&inpres)*fvyr - .5; |
269 |
greg |
3.7 |
while (vy >= fvyr-1) vy--; |
270 |
greg |
3.1 |
dy -= (double)vy; |
271 |
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for (x = 0; x < scanlen(&inpres); x++) { |
272 |
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vx = dx = (x+.5)/scanlen(&inpres)*fvxr - .5; |
273 |
greg |
3.7 |
while (vx >= fvxr-1) vx--; |
274 |
greg |
3.1 |
dx -= (double)vx; |
275 |
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for (i = 0; i < 3; i++) { |
276 |
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lv = (1.-dy)*colval(veilscan(vy)[vx],i) + |
277 |
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dy*colval(veilscan(vy+1)[vx],i); |
278 |
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uv = (1.-dy)*colval(veilscan(vy)[vx+1],i) + |
279 |
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dy*colval(veilscan(vy+1)[vx+1],i); |
280 |
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colval(sl[x],i) = (1.-VADAPT)*colval(sl[x],i) + |
281 |
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(1.-dx)*lv + dx*uv; |
282 |
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} |
283 |
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} |
284 |
greg |
3.3 |
} |
285 |
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286 |
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287 |
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/****************** ACUITY STUFF *******************/ |
288 |
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|
289 |
greg |
3.8 |
typedef struct { |
290 |
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short sampe; /* sample area size (exponent of 2) */ |
291 |
greg |
3.3 |
short nscans; /* number of scanlines in this bar */ |
292 |
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int len; /* individual scanline length */ |
293 |
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int nread; /* number of scanlines loaded */ |
294 |
greg |
3.8 |
COLOR *sdata; /* scanbar data */ |
295 |
greg |
3.3 |
} SCANBAR; |
296 |
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|
297 |
greg |
3.8 |
#define bscan(sb,y) ((COLOR *)(sb)->sdata+((y)%(sb)->nscans)*(sb)->len) |
298 |
greg |
3.3 |
|
299 |
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SCANBAR *rootbar; /* root scan bar (lowest resolution) */ |
300 |
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301 |
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float *inpacuD; /* input acuity data (cycles/degree) */ |
302 |
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303 |
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#define tsampr(x,y) inpacuD[(y)*fvxr+(x)] |
304 |
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305 |
schorsch |
3.17 |
static COLOR * getascan(SCANBAR *sb, int y); |
306 |
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static void acusample(COLOR col, int x, int y, double sr); |
307 |
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static void ascanval(COLOR col, int x, int y, SCANBAR *sb); |
308 |
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static SCANBAR *sballoc(int se, int ns, int sl); |
309 |
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310 |
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extern double |
311 |
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hacuity( /* return visual acuity in cycles/degree */ |
312 |
|
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double La |
313 |
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) |
314 |
greg |
3.13 |
{ |
315 |
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/* functional fit */ |
316 |
|
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return(17.25*atan(1.4*log10(La) + 0.35) + 25.72); |
317 |
greg |
3.3 |
} |
318 |
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|
319 |
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|
320 |
schorsch |
3.17 |
static COLOR * |
321 |
|
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getascan( /* find/read scanline y for scanbar sb */ |
322 |
|
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register SCANBAR *sb, |
323 |
|
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int y |
324 |
|
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) |
325 |
greg |
3.3 |
{ |
326 |
|
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register COLOR *sl0, *sl1, *mysl; |
327 |
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register int i; |
328 |
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|
329 |
greg |
3.6 |
if (y < sb->nread - sb->nscans) /* too far back? */ |
330 |
|
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return(NULL); |
331 |
greg |
3.3 |
for ( ; y >= sb->nread; sb->nread++) { /* read as necessary */ |
332 |
|
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mysl = bscan(sb, sb->nread); |
333 |
greg |
3.8 |
if (sb->sampe == 0) { |
334 |
greg |
3.3 |
if (freadscan(mysl, sb->len, infp) < 0) { |
335 |
|
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fprintf(stderr, "%s: %s: scanline read error\n", |
336 |
|
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progname, infn); |
337 |
|
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exit(1); |
338 |
|
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} |
339 |
|
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} else { |
340 |
greg |
3.8 |
sl0 = getascan(sb+1, 2*y); |
341 |
greg |
3.6 |
if (sl0 == NULL) |
342 |
|
|
return(NULL); |
343 |
greg |
3.8 |
sl1 = getascan(sb+1, 2*y+1); |
344 |
greg |
3.3 |
for (i = 0; i < sb->len; i++) { |
345 |
|
|
copycolor(mysl[i], sl0[2*i]); |
346 |
|
|
addcolor(mysl[i], sl0[2*i+1]); |
347 |
|
|
addcolor(mysl[i], sl1[2*i]); |
348 |
|
|
addcolor(mysl[i], sl1[2*i+1]); |
349 |
|
|
scalecolor(mysl[i], 0.25); |
350 |
|
|
} |
351 |
|
|
} |
352 |
|
|
} |
353 |
|
|
return(bscan(sb, y)); |
354 |
|
|
} |
355 |
|
|
|
356 |
|
|
|
357 |
schorsch |
3.17 |
extern void |
358 |
|
|
acuscan( /* get acuity-sampled scanline */ |
359 |
|
|
COLOR *scln, |
360 |
|
|
int y |
361 |
|
|
) |
362 |
greg |
3.3 |
{ |
363 |
|
|
double sr; |
364 |
|
|
double dx, dy; |
365 |
|
|
int ix, iy; |
366 |
|
|
register int x; |
367 |
|
|
/* compute foveal y position */ |
368 |
|
|
iy = dy = (y+.5)/numscans(&inpres)*fvyr - .5; |
369 |
greg |
3.9 |
while (iy >= fvyr-1) iy--; |
370 |
greg |
3.3 |
dy -= (double)iy; |
371 |
|
|
for (x = 0; x < scanlen(&inpres); x++) { |
372 |
|
|
/* compute foveal x position */ |
373 |
|
|
ix = dx = (x+.5)/scanlen(&inpres)*fvxr - .5; |
374 |
greg |
3.9 |
while (ix >= fvxr-1) ix--; |
375 |
greg |
3.3 |
dx -= (double)ix; |
376 |
|
|
/* interpolate sample rate */ |
377 |
|
|
sr = (1.-dy)*((1.-dx)*tsampr(ix,iy) + dx*tsampr(ix+1,iy)) + |
378 |
|
|
dy*((1.-dx)*tsampr(ix,iy+1) + dx*tsampr(ix+1,iy+1)); |
379 |
|
|
|
380 |
|
|
acusample(scln[x], x, y, sr); /* compute sample */ |
381 |
|
|
} |
382 |
|
|
} |
383 |
|
|
|
384 |
|
|
|
385 |
schorsch |
3.17 |
static void |
386 |
|
|
acusample( /* interpolate sample at (x,y) using rate sr */ |
387 |
|
|
COLOR col, |
388 |
|
|
int x, |
389 |
|
|
int y, |
390 |
|
|
double sr |
391 |
|
|
) |
392 |
greg |
3.3 |
{ |
393 |
|
|
COLOR c1; |
394 |
|
|
double d; |
395 |
|
|
register SCANBAR *sb0; |
396 |
|
|
|
397 |
greg |
3.8 |
for (sb0 = rootbar; sb0->sampe != 0 && 1<<sb0[1].sampe > sr; sb0++) |
398 |
greg |
3.3 |
; |
399 |
|
|
ascanval(col, x, y, sb0); |
400 |
greg |
3.8 |
if (sb0->sampe == 0) /* don't extrapolate highest */ |
401 |
greg |
3.3 |
return; |
402 |
greg |
3.8 |
ascanval(c1, x, y, sb0+1); |
403 |
|
|
d = ((1<<sb0->sampe) - sr)/(1<<sb0[1].sampe); |
404 |
greg |
3.3 |
scalecolor(col, 1.-d); |
405 |
|
|
scalecolor(c1, d); |
406 |
|
|
addcolor(col, c1); |
407 |
|
|
} |
408 |
|
|
|
409 |
|
|
|
410 |
schorsch |
3.17 |
static void |
411 |
|
|
ascanval( /* interpolate scanbar at orig. coords (x,y) */ |
412 |
|
|
COLOR col, |
413 |
|
|
int x, |
414 |
|
|
int y, |
415 |
|
|
SCANBAR *sb |
416 |
|
|
) |
417 |
greg |
3.3 |
{ |
418 |
|
|
COLOR *sl0, *sl1, c1, c1y; |
419 |
|
|
double dx, dy; |
420 |
|
|
int ix, iy; |
421 |
|
|
|
422 |
greg |
3.8 |
if (sb->sampe == 0) { /* no need to interpolate */ |
423 |
greg |
3.6 |
sl0 = getascan(sb, y); |
424 |
|
|
copycolor(col, sl0[x]); |
425 |
|
|
return; |
426 |
|
|
} |
427 |
|
|
/* compute coordinates for sb */ |
428 |
greg |
3.8 |
ix = dx = (x+.5)/(1<<sb->sampe) - .5; |
429 |
greg |
3.7 |
while (ix >= sb->len-1) ix--; |
430 |
greg |
3.3 |
dx -= (double)ix; |
431 |
greg |
3.8 |
iy = dy = (y+.5)/(1<<sb->sampe) - .5; |
432 |
|
|
while (iy >= (numscans(&inpres)>>sb->sampe)-1) iy--; |
433 |
greg |
3.3 |
dy -= (double)iy; |
434 |
|
|
/* get scanlines */ |
435 |
|
|
sl0 = getascan(sb, iy); |
436 |
greg |
3.9 |
#ifdef DEBUG |
437 |
greg |
3.14 |
if (sl0 == NULL) |
438 |
|
|
error(INTERNAL, "cannot backspace in ascanval"); |
439 |
greg |
3.9 |
#endif |
440 |
greg |
3.3 |
sl1 = getascan(sb, iy+1); |
441 |
|
|
/* 2D linear interpolation */ |
442 |
|
|
copycolor(col, sl0[ix]); |
443 |
|
|
scalecolor(col, 1.-dx); |
444 |
|
|
copycolor(c1, sl0[ix+1]); |
445 |
|
|
scalecolor(c1, dx); |
446 |
|
|
addcolor(col, c1); |
447 |
|
|
copycolor(c1y, sl1[ix]); |
448 |
|
|
scalecolor(c1y, 1.-dx); |
449 |
|
|
copycolor(c1, sl1[ix+1]); |
450 |
|
|
scalecolor(c1, dx); |
451 |
|
|
addcolor(c1y, c1); |
452 |
|
|
scalecolor(col, 1.-dy); |
453 |
|
|
scalecolor(c1y, dy); |
454 |
|
|
addcolor(col, c1y); |
455 |
greg |
3.9 |
for (ix = 0; ix < 3; ix++) /* make sure no negative */ |
456 |
|
|
if (colval(col,ix) < 0.) |
457 |
|
|
colval(col,ix) = 0.; |
458 |
greg |
3.3 |
} |
459 |
|
|
|
460 |
|
|
|
461 |
schorsch |
3.17 |
static SCANBAR * |
462 |
|
|
sballoc( /* allocate scanbar */ |
463 |
|
|
int se, /* sampling rate exponent */ |
464 |
|
|
int ns, /* number of scanlines */ |
465 |
|
|
int sl /* original scanline length */ |
466 |
|
|
) |
467 |
greg |
3.3 |
{ |
468 |
greg |
3.8 |
SCANBAR *sbarr; |
469 |
greg |
3.3 |
register SCANBAR *sb; |
470 |
|
|
|
471 |
greg |
3.9 |
sbarr = sb = (SCANBAR *)malloc((se+1)*sizeof(SCANBAR)); |
472 |
greg |
3.3 |
if (sb == NULL) |
473 |
|
|
syserror("malloc"); |
474 |
greg |
3.8 |
do { |
475 |
greg |
3.16 |
sb->len = sl>>se; |
476 |
|
|
if (sb->len <= 0) |
477 |
|
|
continue; |
478 |
greg |
3.9 |
sb->sampe = se; |
479 |
|
|
sb->nscans = ns; |
480 |
|
|
sb->sdata = (COLOR *)malloc(sb->len*ns*sizeof(COLOR)); |
481 |
greg |
3.8 |
if (sb->sdata == NULL) |
482 |
|
|
syserror("malloc"); |
483 |
|
|
sb->nread = 0; |
484 |
|
|
ns <<= 1; |
485 |
|
|
sb++; |
486 |
greg |
3.9 |
} while (--se >= 0); |
487 |
greg |
3.8 |
return(sbarr); |
488 |
greg |
3.3 |
} |
489 |
|
|
|
490 |
|
|
|
491 |
schorsch |
3.17 |
extern void |
492 |
|
|
initacuity(void) /* initialize variable acuity sampling */ |
493 |
greg |
3.3 |
{ |
494 |
|
|
FVECT diffx, diffy, cp; |
495 |
|
|
double omega, maxsr; |
496 |
|
|
register int x, y, i; |
497 |
|
|
|
498 |
|
|
compraydir(); /* compute ray directions */ |
499 |
|
|
|
500 |
|
|
inpacuD = (float *)malloc(fvxr*fvyr*sizeof(float)); |
501 |
|
|
if (inpacuD == NULL) |
502 |
|
|
syserror("malloc"); |
503 |
|
|
maxsr = 1.; /* compute internal sample rates */ |
504 |
|
|
for (y = 1; y < fvyr-1; y++) |
505 |
|
|
for (x = 1; x < fvxr-1; x++) { |
506 |
|
|
for (i = 0; i < 3; i++) { |
507 |
|
|
diffx[i] = 0.5*fvxr/scanlen(&inpres) * |
508 |
|
|
(rdirscan(y)[x+1][i] - |
509 |
|
|
rdirscan(y)[x-1][i]); |
510 |
|
|
diffy[i] = 0.5*fvyr/numscans(&inpres) * |
511 |
|
|
(rdirscan(y+1)[x][i] - |
512 |
|
|
rdirscan(y-1)[x][i]); |
513 |
|
|
} |
514 |
|
|
fcross(cp, diffx, diffy); |
515 |
|
|
omega = 0.5 * sqrt(DOT(cp,cp)); |
516 |
greg |
3.10 |
if (omega <= FTINY*FTINY) |
517 |
greg |
3.4 |
tsampr(x,y) = 1.; |
518 |
|
|
else if ((tsampr(x,y) = PI/180. / sqrt(omega) / |
519 |
|
|
hacuity(plum(fovscan(y)[x]))) > maxsr) |
520 |
greg |
3.3 |
maxsr = tsampr(x,y); |
521 |
|
|
} |
522 |
|
|
/* copy perimeter (easier) */ |
523 |
|
|
for (x = 1; x < fvxr-1; x++) { |
524 |
|
|
tsampr(x,0) = tsampr(x,1); |
525 |
|
|
tsampr(x,fvyr-1) = tsampr(x,fvyr-2); |
526 |
|
|
} |
527 |
|
|
for (y = 0; y < fvyr; y++) { |
528 |
greg |
3.9 |
tsampr(0,y) = tsampr(1,y); |
529 |
|
|
tsampr(fvxr-1,y) = tsampr(fvxr-2,y); |
530 |
greg |
3.3 |
} |
531 |
|
|
/* initialize with next power of two */ |
532 |
greg |
3.8 |
rootbar = sballoc((int)(log(maxsr)/log(2.))+1, 2, scanlen(&inpres)); |
533 |
greg |
3.1 |
} |