14 |
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15 |
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#include "view.h" |
16 |
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|
17 |
< |
VIEW stdview = STDVIEW(512); /* default view parameters */ |
17 |
> |
VIEW stdview = STDVIEW; /* default view parameters */ |
18 |
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|
19 |
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|
20 |
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char * |
21 |
< |
setview(v) /* set vhinc and vvinc, return message on error */ |
21 |
> |
setview(v) /* set hvec and vvec, return message on error */ |
22 |
|
register VIEW *v; |
23 |
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{ |
24 |
< |
double tan(), dt; |
24 |
> |
static char ill_horiz[] = "illegal horizontal view size"; |
25 |
> |
static char ill_vert[] = "illegal vertical view size"; |
26 |
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|
27 |
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if (normalize(v->vdir) == 0.0) /* normalize direction */ |
28 |
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return("zero view direction"); |
28 |
– |
|
29 |
– |
fcross(v->vhinc, v->vdir, v->vup); /* compute horiz dir */ |
29 |
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|
30 |
< |
if (normalize(v->vhinc) == 0.0) |
30 |
> |
fcross(v->hvec, v->vdir, v->vup); /* compute horiz dir */ |
31 |
> |
|
32 |
> |
if (normalize(v->hvec) == 0.0) |
33 |
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return("illegal view up vector"); |
33 |
– |
|
34 |
– |
fcross(v->vvinc, v->vhinc, v->vdir); /* compute vert dir */ |
34 |
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|
35 |
< |
if (v->type == VT_PAR) |
37 |
< |
dt = v->horiz; |
38 |
< |
else if (v->type == VT_PER) |
39 |
< |
dt = 2.0 * tan(v->horiz*(PI/180.0/2.0)); |
40 |
< |
else |
41 |
< |
return("unknown view type"); |
35 |
> |
fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */ |
36 |
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|
37 |
< |
if (dt <= FTINY || dt >= FHUGE) |
38 |
< |
return("illegal horizontal view size"); |
37 |
> |
if (v->horiz <= FTINY) |
38 |
> |
return(ill_horiz); |
39 |
> |
if (v->vert <= FTINY) |
40 |
> |
return(ill_vert); |
41 |
|
|
42 |
< |
if (v->hresolu <= 0) |
43 |
< |
return("illegal horizontal resolution"); |
42 |
> |
switch (v->type) { |
43 |
> |
case VT_PAR: /* parallel view */ |
44 |
> |
v->hn2 = v->horiz; |
45 |
> |
v->vn2 = v->vert; |
46 |
> |
break; |
47 |
> |
case VT_PER: /* perspective view */ |
48 |
> |
if (v->horiz >= 180.0-FTINY) |
49 |
> |
return(ill_horiz); |
50 |
> |
if (v->vert >= 180.0-FTINY) |
51 |
> |
return(ill_vert); |
52 |
> |
v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0)); |
53 |
> |
v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
54 |
> |
break; |
55 |
> |
case VT_ANG: /* angular fisheye */ |
56 |
> |
if (v->horiz > 360.0+FTINY) |
57 |
> |
return(ill_horiz); |
58 |
> |
if (v->vert > 360.0+FTINY) |
59 |
> |
return(ill_vert); |
60 |
> |
v->hn2 = v->horiz / 90.0; |
61 |
> |
v->vn2 = v->vert / 90.0; |
62 |
> |
break; |
63 |
> |
case VT_HEM: /* hemispherical fisheye */ |
64 |
> |
if (v->horiz > 180.0+FTINY) |
65 |
> |
return(ill_horiz); |
66 |
> |
if (v->vert > 180.0+FTINY) |
67 |
> |
return(ill_vert); |
68 |
> |
v->hn2 = 2.0 * sin(v->horiz*(PI/180.0/2.0)); |
69 |
> |
v->vn2 = 2.0 * sin(v->vert*(PI/180.0/2.0)); |
70 |
> |
break; |
71 |
> |
default: |
72 |
> |
return("unknown view type"); |
73 |
> |
} |
74 |
> |
if (v->type == VT_PAR || v->type == VT_PER) { |
75 |
> |
v->hvec[0] *= v->hn2; |
76 |
> |
v->hvec[1] *= v->hn2; |
77 |
> |
v->hvec[2] *= v->hn2; |
78 |
> |
v->vvec[0] *= v->vn2; |
79 |
> |
v->vvec[1] *= v->vn2; |
80 |
> |
v->vvec[2] *= v->vn2; |
81 |
> |
} |
82 |
> |
v->hn2 *= v->hn2; |
83 |
> |
v->vn2 *= v->vn2; |
84 |
|
|
85 |
< |
dt /= (double)v->hresolu; |
86 |
< |
v->vhinc[0] *= dt; |
51 |
< |
v->vhinc[1] *= dt; |
52 |
< |
v->vhinc[2] *= dt; |
85 |
> |
return(NULL); |
86 |
> |
} |
87 |
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|
54 |
– |
if (v->type == VT_PAR) |
55 |
– |
dt = v->vert; |
56 |
– |
else |
57 |
– |
dt = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
88 |
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|
89 |
< |
if (dt <= FTINY || dt >= FHUGE) |
90 |
< |
return("illegal vertical view size"); |
91 |
< |
|
92 |
< |
if (v->vresolu <= 0) |
93 |
< |
return("illegal vertical resolution"); |
94 |
< |
|
95 |
< |
dt /= (double)v->vresolu; |
96 |
< |
v->vvinc[0] *= dt; |
97 |
< |
v->vvinc[1] *= dt; |
98 |
< |
v->vvinc[2] *= dt; |
99 |
< |
|
70 |
< |
return(NULL); |
89 |
> |
normaspect(va, ap, xp, yp) /* fix pixel aspect or resolution */ |
90 |
> |
double va; /* view aspect ratio */ |
91 |
> |
double *ap; /* pixel aspect in (or out if 0) */ |
92 |
> |
int *xp, *yp; /* x and y resolution in (or out if *ap!=0) */ |
93 |
> |
{ |
94 |
> |
if (*ap <= FTINY) |
95 |
> |
*ap = va * *xp / *yp; /* compute pixel aspect */ |
96 |
> |
else if (va * *xp > *ap * *yp) |
97 |
> |
*xp = *yp / va * *ap + .5; /* reduce x resolution */ |
98 |
> |
else |
99 |
> |
*yp = *xp * va / *ap + .5; /* reduce y resolution */ |
100 |
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} |
101 |
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|
102 |
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|
103 |
< |
rayview(orig, direc, v, x, y) /* compute ray origin and direction */ |
103 |
> |
viewray(orig, direc, v, x, y) /* compute ray origin and direction */ |
104 |
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FVECT orig, direc; |
105 |
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register VIEW *v; |
106 |
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double x, y; |
107 |
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{ |
108 |
< |
register int i; |
108 |
> |
double d, z; |
109 |
> |
|
110 |
> |
x += v->hoff - 0.5; |
111 |
> |
y += v->voff - 0.5; |
112 |
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|
113 |
< |
x -= 0.5 * v->hresolu; |
114 |
< |
y -= 0.5 * v->vresolu; |
115 |
< |
|
116 |
< |
if (v->type == VT_PAR) { /* parallel view */ |
117 |
< |
for (i = 0; i < 3; i++) |
86 |
< |
orig[i] = v->vp[i] + x*v->vhinc[i] + y*v->vvinc[i]; |
113 |
> |
switch(v->type) { |
114 |
> |
case VT_PAR: /* parallel view */ |
115 |
> |
orig[0] = v->vp[0] + x*v->hvec[0] + y*v->vvec[0]; |
116 |
> |
orig[1] = v->vp[1] + x*v->hvec[1] + y*v->vvec[1]; |
117 |
> |
orig[2] = v->vp[2] + x*v->hvec[2] + y*v->vvec[2]; |
118 |
|
VCOPY(direc, v->vdir); |
119 |
< |
} else { /* perspective view */ |
119 |
> |
return(0); |
120 |
> |
case VT_PER: /* perspective view */ |
121 |
|
VCOPY(orig, v->vp); |
122 |
< |
for (i = 0; i < 3; i++) |
123 |
< |
direc[i] = v->vdir[i] + x*v->vhinc[i] + y*v->vvinc[i]; |
122 |
> |
direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
123 |
> |
direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
124 |
> |
direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
125 |
|
normalize(direc); |
126 |
+ |
return(0); |
127 |
+ |
case VT_HEM: /* hemispherical fisheye */ |
128 |
+ |
x *= v->horiz/90.0; |
129 |
+ |
y *= v->vert/90.0; |
130 |
+ |
z = 1.0 - x*x - y*y; |
131 |
+ |
if (z < 0.0) |
132 |
+ |
return(-1); |
133 |
+ |
z = sqrt(z); |
134 |
+ |
VCOPY(orig, v->vp); |
135 |
+ |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
136 |
+ |
direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
137 |
+ |
direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
138 |
+ |
return(0); |
139 |
+ |
case VT_ANG: /* angular fisheye */ |
140 |
+ |
x *= v->horiz/180.0; |
141 |
+ |
y *= v->vert/180.0; |
142 |
+ |
d = x*x + y*y; |
143 |
+ |
if (d > 1.0) |
144 |
+ |
return(-1); |
145 |
+ |
VCOPY(orig, v->vp); |
146 |
+ |
if (d <= FTINY) { |
147 |
+ |
VCOPY(direc, v->vdir); |
148 |
+ |
return(0); |
149 |
+ |
} |
150 |
+ |
d = sqrt(d); |
151 |
+ |
z = cos(PI*d); |
152 |
+ |
d = sqrt(1 - z*z)/d; |
153 |
+ |
x *= d; |
154 |
+ |
y *= d; |
155 |
+ |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
156 |
+ |
direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
157 |
+ |
direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
158 |
+ |
return(0); |
159 |
|
} |
160 |
+ |
return(-1); |
161 |
|
} |
162 |
|
|
163 |
|
|
164 |
< |
sscanview(vp, s) /* get view parameters */ |
165 |
< |
register VIEW *vp; |
166 |
< |
register char *s; |
164 |
> |
viewpixel(xp, yp, zp, v, p) /* find image location for point */ |
165 |
> |
double *xp, *yp, *zp; |
166 |
> |
register VIEW *v; |
167 |
> |
FVECT p; |
168 |
|
{ |
169 |
< |
for ( ; ; ) |
170 |
< |
switch (*s++) { |
171 |
< |
case '\0': |
172 |
< |
case '\n': |
173 |
< |
return(0); |
174 |
< |
case '-': |
175 |
< |
switch (*s++) { |
176 |
< |
case '\0': |
177 |
< |
return(-1); |
178 |
< |
case 'x': |
179 |
< |
if (sscanf(s, "%d", &vp->hresolu) != 1) |
180 |
< |
return(-1); |
181 |
< |
s = sskip(s); |
182 |
< |
continue; |
183 |
< |
case 'y': |
184 |
< |
if (sscanf(s, "%d", &vp->vresolu) != 1) |
185 |
< |
return(-1); |
186 |
< |
s = sskip(s); |
187 |
< |
continue; |
188 |
< |
case 'v': |
121 |
< |
switch (*s++) { |
122 |
< |
case '\0': |
123 |
< |
return(-1); |
124 |
< |
case 't': |
125 |
< |
vp->type = *s++; |
126 |
< |
continue; |
127 |
< |
case 'p': |
128 |
< |
if (sscanf(s, "%lf %lf %lf", |
129 |
< |
&vp->vp[0], |
130 |
< |
&vp->vp[1], |
131 |
< |
&vp->vp[2]) != 3) |
132 |
< |
return(-1); |
133 |
< |
s = sskip(sskip(sskip(s))); |
134 |
< |
continue; |
135 |
< |
case 'd': |
136 |
< |
if (sscanf(s, "%lf %lf %lf", |
137 |
< |
&vp->vdir[0], |
138 |
< |
&vp->vdir[1], |
139 |
< |
&vp->vdir[2]) != 3) |
140 |
< |
return(-1); |
141 |
< |
s = sskip(sskip(sskip(s))); |
142 |
< |
continue; |
143 |
< |
case 'u': |
144 |
< |
if (sscanf(s, "%lf %lf %lf", |
145 |
< |
&vp->vup[0], |
146 |
< |
&vp->vup[1], |
147 |
< |
&vp->vup[2]) != 3) |
148 |
< |
return(-1); |
149 |
< |
s = sskip(sskip(sskip(s))); |
150 |
< |
continue; |
151 |
< |
case 'h': |
152 |
< |
if (sscanf(s, "%lf", |
153 |
< |
&vp->horiz) != 1) |
154 |
< |
return(-1); |
155 |
< |
s = sskip(s); |
156 |
< |
continue; |
157 |
< |
case 'v': |
158 |
< |
if (sscanf(s, "%lf", |
159 |
< |
&vp->vert) != 1) |
160 |
< |
return(-1); |
161 |
< |
s = sskip(s); |
162 |
< |
continue; |
163 |
< |
} |
164 |
< |
continue; |
165 |
< |
} |
166 |
< |
continue; |
169 |
> |
double d; |
170 |
> |
FVECT disp; |
171 |
> |
|
172 |
> |
disp[0] = p[0] - v->vp[0]; |
173 |
> |
disp[1] = p[1] - v->vp[1]; |
174 |
> |
disp[2] = p[2] - v->vp[2]; |
175 |
> |
|
176 |
> |
switch (v->type) { |
177 |
> |
case VT_PAR: /* parallel view */ |
178 |
> |
if (zp != NULL) |
179 |
> |
*zp = DOT(disp,v->vdir); |
180 |
> |
*xp = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
181 |
> |
*yp = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
182 |
> |
return; |
183 |
> |
case VT_PER: /* perspective view */ |
184 |
> |
d = DOT(disp,v->vdir); |
185 |
> |
if (zp != NULL) { |
186 |
> |
*zp = sqrt(DOT(disp,disp)); |
187 |
> |
if (d < 0.0) |
188 |
> |
*zp = -*zp; |
189 |
|
} |
190 |
+ |
if (d < 0.0) /* fold pyramid */ |
191 |
+ |
d = -d; |
192 |
+ |
if (d > FTINY) { |
193 |
+ |
d = 1.0/d; |
194 |
+ |
disp[0] *= d; |
195 |
+ |
disp[1] *= d; |
196 |
+ |
disp[2] *= d; |
197 |
+ |
} |
198 |
+ |
*xp = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
199 |
+ |
*yp = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
200 |
+ |
return; |
201 |
+ |
case VT_HEM: /* hemispherical fisheye */ |
202 |
+ |
d = normalize(disp); |
203 |
+ |
if (zp != NULL) { |
204 |
+ |
if (DOT(disp,v->vdir) < 0.0) |
205 |
+ |
*zp = -d; |
206 |
+ |
else |
207 |
+ |
*zp = d; |
208 |
+ |
} |
209 |
+ |
*xp = DOT(disp,v->hvec)*90.0/v->horiz + 0.5 - v->hoff; |
210 |
+ |
*yp = DOT(disp,v->vvec)*90.0/v->vert + 0.5 - v->voff; |
211 |
+ |
return; |
212 |
+ |
case VT_ANG: /* angular fisheye */ |
213 |
+ |
d = normalize(disp); |
214 |
+ |
if (zp != NULL) |
215 |
+ |
*zp = d; |
216 |
+ |
*xp = 0.5 - v->hoff; |
217 |
+ |
*yp = 0.5 - v->voff; |
218 |
+ |
d = DOT(disp,v->vdir); |
219 |
+ |
if (d >= 1.0-FTINY) |
220 |
+ |
return; |
221 |
+ |
if (d <= -(1.0-FTINY)) { |
222 |
+ |
*xp += 180.0/v->horiz; |
223 |
+ |
*yp += 180.0/v->vert; |
224 |
+ |
return; |
225 |
+ |
} |
226 |
+ |
d = acos(d)/PI / sqrt(1.0 - d*d); |
227 |
+ |
*xp += DOT(disp,v->hvec)*d*180.0/v->horiz; |
228 |
+ |
*yp += DOT(disp,v->vvec)*d*180.0/v->vert; |
229 |
+ |
return; |
230 |
+ |
} |
231 |
|
} |
232 |
|
|
233 |
|
|
234 |
+ |
int |
235 |
+ |
getviewopt(v, ac, av) /* process view argument */ |
236 |
+ |
register VIEW *v; |
237 |
+ |
int ac; |
238 |
+ |
register char *av[]; |
239 |
+ |
{ |
240 |
+ |
#define check(c,n) if ((av[0][c]&&av[0][c]!=' ') || n>=ac) return(-1) |
241 |
+ |
extern double atof(); |
242 |
+ |
|
243 |
+ |
if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v') |
244 |
+ |
return(-1); |
245 |
+ |
switch (av[0][2]) { |
246 |
+ |
case 't': /* type */ |
247 |
+ |
if (!av[0][3] || av[0][3]==' ') |
248 |
+ |
return(-1); |
249 |
+ |
check(4,0); |
250 |
+ |
v->type = av[0][3]; |
251 |
+ |
return(0); |
252 |
+ |
case 'p': /* point */ |
253 |
+ |
check(3,3); |
254 |
+ |
v->vp[0] = atof(av[1]); |
255 |
+ |
v->vp[1] = atof(av[2]); |
256 |
+ |
v->vp[2] = atof(av[3]); |
257 |
+ |
return(3); |
258 |
+ |
case 'd': /* direction */ |
259 |
+ |
check(3,3); |
260 |
+ |
v->vdir[0] = atof(av[1]); |
261 |
+ |
v->vdir[1] = atof(av[2]); |
262 |
+ |
v->vdir[2] = atof(av[3]); |
263 |
+ |
return(3); |
264 |
+ |
case 'u': /* up */ |
265 |
+ |
check(3,3); |
266 |
+ |
v->vup[0] = atof(av[1]); |
267 |
+ |
v->vup[1] = atof(av[2]); |
268 |
+ |
v->vup[2] = atof(av[3]); |
269 |
+ |
return(3); |
270 |
+ |
case 'h': /* horizontal size */ |
271 |
+ |
check(3,1); |
272 |
+ |
v->horiz = atof(av[1]); |
273 |
+ |
return(1); |
274 |
+ |
case 'v': /* vertical size */ |
275 |
+ |
check(3,1); |
276 |
+ |
v->vert = atof(av[1]); |
277 |
+ |
return(1); |
278 |
+ |
case 's': /* shift */ |
279 |
+ |
check(3,1); |
280 |
+ |
v->hoff = atof(av[1]); |
281 |
+ |
return(1); |
282 |
+ |
case 'l': /* lift */ |
283 |
+ |
check(3,1); |
284 |
+ |
v->voff = atof(av[1]); |
285 |
+ |
return(1); |
286 |
+ |
default: |
287 |
+ |
return(-1); |
288 |
+ |
} |
289 |
+ |
#undef check |
290 |
+ |
} |
291 |
+ |
|
292 |
+ |
|
293 |
+ |
int |
294 |
+ |
sscanview(vp, s) /* get view parameters from string */ |
295 |
+ |
VIEW *vp; |
296 |
+ |
register char *s; |
297 |
+ |
{ |
298 |
+ |
int ac; |
299 |
+ |
char *av[4]; |
300 |
+ |
int na; |
301 |
+ |
int nvopts = 0; |
302 |
+ |
|
303 |
+ |
while (*s == ' ') |
304 |
+ |
s++; |
305 |
+ |
while (*s) { |
306 |
+ |
ac = 0; |
307 |
+ |
do { |
308 |
+ |
av[ac++] = s; |
309 |
+ |
while (*s && *s != ' ') |
310 |
+ |
s++; |
311 |
+ |
while (*s == ' ') |
312 |
+ |
s++; |
313 |
+ |
} while (*s && ac < 4); |
314 |
+ |
if ((na = getviewopt(vp, ac, av)) >= 0) { |
315 |
+ |
if (na+1 < ac) |
316 |
+ |
s = av[na+1]; |
317 |
+ |
nvopts++; |
318 |
+ |
} else if (ac > 1) |
319 |
+ |
s = av[1]; |
320 |
+ |
} |
321 |
+ |
return(nvopts); |
322 |
+ |
} |
323 |
+ |
|
324 |
+ |
|
325 |
|
fprintview(vp, fp) /* write out view parameters */ |
326 |
|
register VIEW *vp; |
327 |
|
FILE *fp; |
331 |
|
fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0], vp->vdir[1], vp->vdir[2]); |
332 |
|
fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]); |
333 |
|
fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert); |
334 |
< |
fprintf(fp, " -x %d -y %d", vp->hresolu, vp->vresolu); |
334 |
> |
fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff); |
335 |
|
} |
336 |
|
|
337 |
|
|
338 |
|
static VIEW *hview; /* view from header */ |
339 |
|
static int gothview; /* success indicator */ |
340 |
< |
static char *altname[] = {NULL,"rpict","rview",VIEWSTR,NULL}; |
340 |
> |
static char *altname[] = {NULL,"rpict","rview","pinterp",VIEWSTR,NULL}; |
341 |
|
|
342 |
|
|
343 |
|
static |
348 |
|
|
349 |
|
for (an = altname; *an != NULL; an++) |
350 |
|
if (!strncmp(*an, s, strlen(*an))) { |
351 |
< |
if (sscanview(hview, s+strlen(*an)) == 0) |
351 |
> |
if (sscanview(hview, s+strlen(*an)) > 0) |
352 |
|
gothview++; |
353 |
|
return; |
354 |
|
} |
356 |
|
|
357 |
|
|
358 |
|
int |
359 |
< |
viewfile(fname, vp) /* get view from file */ |
359 |
> |
viewfile(fname, vp, xp, yp) /* get view from file */ |
360 |
|
char *fname; |
361 |
|
VIEW *vp; |
362 |
+ |
int *xp, *yp; |
363 |
|
{ |
364 |
|
extern char *progname; |
365 |
|
FILE *fp; |
372 |
|
gothview = 0; |
373 |
|
|
374 |
|
getheader(fp, gethview); |
375 |
+ |
|
376 |
+ |
if (xp != NULL && yp != NULL |
377 |
+ |
&& fgetresolu(xp, yp, fp) == -1) |
378 |
+ |
gothview = 0; |
379 |
|
|
380 |
|
fclose(fp); |
381 |
|
|