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/* Copyright (C) 2003-2012 by George Williams */
/*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef FONTFORGE_NONLINEARTRANS_H
#define FONTFORGE_NONLINEARTRANS_H
#include "baseviews.h"
#include "splinefont.h"
#include <utype.h>
#include <ustring.h>
#include <math.h>
#ifdef HAVE_IEEEFP_H
# include <ieeefp.h> /* Solaris defines isnan in ieeefp rather than math.h */
#endif
enum operator {
op_base = 0x100, /* Bigger than any character */
op_x, op_y, /* Returns current x & y values, no operands */
op_value, /* Returns a constant value */
op_negate, op_not, /* Unary operators: op1 */
op_log, op_exp, op_sqrt, op_sin, op_cos, op_tan,
op_abs, op_rint, op_floor, op_ceil,
op_pow, /* Binary operators: op1, op2 */
op_atan2,
op_times, op_div, op_mod,
op_add, op_sub,
op_eq, op_ne, op_le, op_lt, op_gt, op_ge,
op_and, op_or,
op_if /* Trinary operator: op1 ? op2 : op3 */
};
struct expr {
enum operator operator;
struct expr *op1, *op2, *op3;
real value;
};
struct expr_context {
char *start, *cur;
unsigned int had_error: 1;
enum operator backed_token;
real backed_val;
real x, y;
struct expr *x_expr, *y_expr;
SplineChar *sc;
void *pov;
void (*pov_func)(BasePoint *me,void *);
};
extern void _SFNLTrans(FontViewBase *fv, struct expr_context *c);
extern struct expr *nlt_parseexpr(struct expr_context *c, char *str);
extern void nlt_exprfree(struct expr *e);
extern void CVNLTrans(CharViewBase *cv,struct expr_context *c);
extern void SPLPoV(SplineSet *spl,struct pov_data *pov, int only_selected);
extern int SCNLTrans(SplineChar *sc, int layer, char *x_expr, char *y_expr);
extern int SSNLTrans(SplineSet *ss, char *x_expr, char *y_expr);
extern void CVYPerspective(CharViewBase *cv, bigreal x_vanish, bigreal y_vanish);
extern void FVPointOfView(FontViewBase *fv, struct pov_data *pov);
#endif /* FONTFORGE_NONLINEARTRANS_H */