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// Copyright 2004 David Hilvert <dhilvert@auricle.dyndns.org>,
// <dhilvert@ugcs.caltech.edu>
/* This file is part of the Anti-Lamenessing Engine.
The Anti-Lamenessing Engine is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
The Anti-Lamenessing Engine is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the Anti-Lamenessing Engine; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __render_parse_h__
#define __render_parse_h__
#include "render.h"
#include "render/combine.h"
#include "render/invariant.h"
#include "render/incremental.h"
#include "render/zero.h"
/*
* Parse strings describing renderers, and return a renderer satisfying
* the string.
*/
class render_parse {
private:
static int strpfix(const char *a, const char *b) {
return strncmp(a, b, strlen(a));
}
static void nomem() {
fprintf(stderr, "\n\n*** Error: unable to allocate memory in render_parse. ***\n\n");
exit(1);
}
static void syntax_error(const char *explanation) {
fprintf(stderr, "\n\n*** Error: Render syntax: %s ***\n\n", explanation);
exit(1);
}
static filter::filter *get_SF_atomic(const char *type) {
double param;
if (!strcmp("sinc", type)) {
return new filter::sinc();
} else if (!strpfix("lanc:", type)) {
if (sscanf(type + strlen("lanc:"), "%lf", ¶m) != 1)
syntax_error("Unable to get lanczos diameter.");
return new filter::lanczos(param/2);
} else if (!strpfix("triangle:", type)) {
if (sscanf(type + strlen("triangle:"), "%lf", ¶m) != 1)
syntax_error("Unable to get triangle diameter.");
return new filter::triangle(param/2);
} else if (!strpfix("box:", type)) {
if (sscanf(type + strlen("box:"), "%lf", ¶m) != 1)
syntax_error("Unable to get box diameter.");
return new filter::box(param/2);
} else if (!strpfix("gauss:", type)) {
if (sscanf(type + strlen("gauss:"), "%lf", ¶m) != 1)
syntax_error("Unable to get gauss deviation.");
return new filter::gauss(param);
} else if (!strpfix("zero", type)) {
return new filter::zero();
} else {
fprintf(stderr, "get_SF_atomic type %s\n", type);
syntax_error("Unable to get filter.");
}
assert (0);
/*
* This line should never be reached; it's included to avoid
* 'unreachable' messages emitted by some compilers.
*/
return NULL;
}
static filter::filter *get_SF(const char *orig_type) {
char *type = strdup(orig_type);
if (type == NULL)
nomem();
char *star_index = (char *) type;
while (*star_index != '\0'
&& *star_index != '*')
star_index++;
if (*star_index == '\0') {
free(type);
return get_SF_atomic(orig_type);
}
*star_index = '\0';
filter::filter *result = new filter::mult(
get_SF_atomic(type),
get_SF(star_index + 1));
*star_index = '*';
free(type);
return result;
}
public:
static filter::scaled_filter *get_SSF(const char *type) {
if (!strpfix("coarse:", type)) {
return new filter::scaled_filter(get_SF(type + strlen("coarse:")), 1);
} else if (!strpfix("fine:", type)) {
return new filter::scaled_filter(get_SF(type + strlen("fine:")), 0);
} else if (!strpfix("auto:", type)) {
return new filter::scaled_filter(get_SF(type + strlen("auto:")), 2);
} else {
return new filter::scaled_filter(get_SF(type), 1);
}
}
static filter::ssfe *get_SSFE(const char *type) {
if (!strpfix("ex:", type)) {
return new filter::ssfe(get_SSF(type + strlen("ex:")), 1);
} else if (!strpfix("nex:", type)) {
return new filter::ssfe(get_SSF(type + strlen("nex:")), 0);
} else {
return new filter::ssfe(get_SSF(type), 1);
}
}
static render *get_invariant(const char *type) {
double param;
int offset;
invariant *i;
if (!strpfix("min:", type)) {
i = new invariant(get_SSFE(type + strlen("min:")));
i->set_min();
} else if (!strpfix("max:", type)) {
i = new invariant(get_SSFE(type + strlen("max:")));
i->set_max();
} else if (!strpfix("last:", type)) {
i = new invariant(get_SSFE(type + strlen("last:")));
i->set_last();
} else if (!strpfix("first:", type)) {
i = new invariant(get_SSFE(type + strlen("first:")));
i->set_first();
} else if (!strpfix("avg:", type)) {
i = new invariant(get_SSFE(type + strlen("avg:")));
i->set_avg();
} else if (!strpfix("avgf:", type)) {
if (sscanf(type + strlen("avgf:"), "%lf%n", ¶m, &offset) != 1)
syntax_error("Unable to get avgf weight criterion.");
i = new invariant(get_SSFE(type + strlen("avgf:") + offset + strlen(":")));
i->set_avgf(param);
} else if (!strpfix("median:", type)) {
i = new invariant(get_SSFE(type + strlen("median:")));
i->set_median();
} else {
i = new invariant(get_SSFE(type));
i->set_avg();
}
for (int index = 0; index < render::render_count(); index++)
if (typeid(*render::render_num(index)) == typeid(incremental)
&& i->equals(((incremental *)render::render_num(index))->get_invariant())) {
delete i;
return (incremental *)render::render_num(index);
} else if (typeid(*i->ssfe()->get_scaled_filter()->get_filter()) == typeid(filter::zero)) {
return new zero(i);
}
// fprintf(stderr, " new '%s'.\n", type);
return new incremental(i);
}
static render *get_combination(const char *ptype, const char *dtype) {
render *partial = get_invariant(ptype);
render *_default = get(dtype);
for (int index = 0; index < render::render_count(); index++)
if (typeid(*render::render_num(index)) == typeid(combine)
&& _default == ((combine *)render::render_num(index))->get_default()
&& partial == ((combine *)render::render_num(index))->get_partial()) {
return render::render_num(index);
}
// fprintf(stderr, " new '%s,%s'.\n", ptype, dtype);
return new combine(_default, partial);
}
static render *get(const char *orig_type) {
char *type = strdup(orig_type);
if (type == NULL)
nomem();
char *comma_index = (char *) type;
while (*comma_index != '\0'
&& *comma_index != ',')
comma_index++;
if (*comma_index == '\0') {
free(type);
return get_invariant(orig_type);
}
*comma_index = '\0';
render *result = get_combination(type, comma_index + 1);
*comma_index = ',';
free(type);
return result;
}
};
#endif
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