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824 lines
21 KiB
C
824 lines
21 KiB
C
/*
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* Copyright © 2020 Benjamin Otte
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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#include "config.h"
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#include "gskpathprivate.h"
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#include "gskcurveprivate.h"
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#include "gskpathbuilder.h"
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#include "gskpathpoint.h"
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#include "gskcontourprivate.h"
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static void
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skip_whitespace (const char **p)
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{
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while (g_ascii_isspace (**p))
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(*p)++;
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}
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static void
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skip_optional_comma (const char **p)
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{
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skip_whitespace (p);
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if (**p == ',')
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(*p)++;
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}
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static gboolean
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parse_number (const char **p,
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double *c)
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{
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char *e;
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*c = g_ascii_strtod (*p, &e);
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if (e == *p)
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return FALSE;
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*p = e;
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skip_optional_comma (p);
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return TRUE;
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}
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static gboolean
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parse_coordinate (const char **p,
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double *c)
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{
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return parse_number (p, c);
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}
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static gboolean
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parse_coordinate_pair (const char **p,
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double *x,
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double *y)
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{
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double xx, yy;
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const char *o = *p;
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if (!parse_coordinate (p, &xx))
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{
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*p = o;
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return FALSE;
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}
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if (!parse_coordinate (p, &yy))
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{
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*p = o;
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return FALSE;
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}
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*x = xx;
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*y = yy;
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return TRUE;
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}
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static gboolean
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parse_nonnegative_number (const char **p,
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double *x)
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{
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const char *o = *p;
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double n;
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if (!parse_number (p, &n))
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return FALSE;
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if (n < 0)
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{
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*p = o;
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return FALSE;
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}
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*x = n;
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return TRUE;
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}
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/* This fixes a flaw in our use of strchr() below:
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*
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* If p already points at the end of the string,
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* we misinterpret strchr ("xyz", *p) returning
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* non-NULL to mean that we can increment p.
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*
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* But strchr() will return a pointer to the
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* final NUL byte in this case, and we walk off
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* the end of the string. Oops
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*/
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static inline char *
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_strchr (const char *str,
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int c)
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{
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if (c == 0)
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return NULL;
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else
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return strchr (str, c);
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}
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static gboolean
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parse_flag (const char **p,
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gboolean *f)
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{
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skip_whitespace (p);
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if (_strchr ("01", **p))
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{
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*f = **p == '1';
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(*p)++;
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skip_optional_comma (p);
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return TRUE;
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}
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return FALSE;
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}
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static gboolean
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parse_command (const char **p,
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char *cmd)
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{
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char *s;
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const char *allowed;
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if (*cmd == 'X')
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allowed = "mM";
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else
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allowed = "mMhHvVzZlLcCsStTqQaAoO";
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skip_whitespace (p);
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s = _strchr (allowed, **p);
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if (s)
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{
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*cmd = *s;
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(*p)++;
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return TRUE;
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}
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return FALSE;
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}
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static gboolean
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parse_string (const char **p,
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const char *s)
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{
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int len = strlen (s);
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if (strncmp (*p, s, len) != 0)
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return FALSE;
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(*p) += len;
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return TRUE;
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}
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#define NEAR(x, y) (fabs ((x) - (y)) < 0.001)
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static gboolean
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is_rect (double x0, double y0,
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double x1, double y1,
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double x2, double y2,
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double x3, double y3)
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{
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return NEAR (x0, x3) && NEAR (x1, x2) &&
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NEAR (y0, y1) && NEAR (y2, y3) &&
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x0 < x1 && y1 < y2;
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}
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static gboolean
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is_line (double x0, double y0,
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double x1, double y1,
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double x2, double y2,
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double x3, double y3)
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{
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if (NEAR (y0, y3))
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return x0 <= x1 && x1 <= x2 && x2 <= x3 &&
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NEAR (y0, y1) && NEAR (y0, y2) && NEAR (y0, y3);
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else
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return y0 <= y1 && y1 <= y2 && y2 <= y3 &&
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NEAR (x0, x1) && NEAR (x0, x2) && NEAR (x0, x3);
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}
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static gboolean
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parse_rectangle (const char **p,
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double *x,
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double *y,
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double *w,
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double *h)
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{
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const char *o = *p;
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double w2;
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if (parse_coordinate_pair (p, x, y) &&
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parse_string (p, "h") &&
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parse_coordinate (p, w) &&
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parse_string (p, "v") &&
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parse_coordinate (p, h) &&
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parse_string (p, "h") &&
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parse_coordinate (p, &w2) &&
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parse_string (p, "z") &&
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w2 == -*w && *w >= 0 && *h >= 0)
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{
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skip_whitespace (p);
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return TRUE;
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}
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*p = o;
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return FALSE;
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}
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static gboolean
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parse_circle (const char **p,
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double *cx,
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double *cy,
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double *r)
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{
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const char *o = *p;
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double x0, y0, x1, y1, x2, y2, x3, y3;
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double x4, y4, x5, y5, x6, y6, x7, y7;
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double x8, y8, w0, w1, w2, w3;
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double rr;
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if (parse_coordinate_pair (p, &x0, &y0) &&
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parse_string (p, "o") &&
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parse_coordinate_pair (p, &x1, &y1) &&
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parse_coordinate_pair (p, &x2, &y2) &&
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parse_nonnegative_number (p, &w0) &&
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parse_string (p, "o") &&
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parse_coordinate_pair (p, &x3, &y3) &&
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parse_coordinate_pair (p, &x4, &y4) &&
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parse_nonnegative_number (p, &w1) &&
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parse_string (p, "o") &&
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parse_coordinate_pair (p, &x5, &y5) &&
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parse_coordinate_pair (p, &x6, &y6) &&
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parse_nonnegative_number (p, &w2) &&
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parse_string (p, "o") &&
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parse_coordinate_pair (p, &x7, &y7) &&
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parse_coordinate_pair (p, &x8, &y8) &&
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parse_nonnegative_number (p, &w3) &&
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parse_string (p, "z"))
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{
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rr = y1;
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if (x1 == 0 && y1 == rr &&
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x2 == -rr && y2 == rr &&
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x3 == -rr && y3 == 0 &&
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x4 == -rr && y4 == -rr &&
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x5 == 0 && y5 == -rr &&
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x6 == rr && y6 == -rr &&
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x7 == rr && y7 == 0 &&
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x8 == rr && y8 == rr &&
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NEAR (w0, M_SQRT1_2) && NEAR (w1, M_SQRT1_2) &&
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NEAR (w2, M_SQRT1_2) && NEAR (w3, M_SQRT1_2))
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{
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*cx = x0 - rr;
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*cy = y0;
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*r = rr;
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skip_whitespace (p);
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return TRUE;
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}
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}
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*p = o;
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return FALSE;
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}
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static gboolean
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parse_rounded_rect (const char **p,
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GskRoundedRect *rr)
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{
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const char *o = *p;
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double x0, y0, x1, y1, x2, y2, x3, y3;
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double x4, y4, x5, y5, x6, y6, x7, y7;
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double x8, y8, x9, y9, x10, y10, x11, y11;
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double x12, y12, w0, w1, w2, w3;
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if (parse_coordinate_pair (p, &x0, &y0) &&
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parse_string (p, "L") &&
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parse_coordinate_pair (p, &x1, &y1) &&
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parse_string (p, "O") &&
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parse_coordinate_pair (p, &x2, &y2) &&
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parse_coordinate_pair (p, &x3, &y3) &&
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parse_nonnegative_number (p, &w0) &&
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parse_string (p, "L") &&
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parse_coordinate_pair (p, &x4, &y4) &&
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parse_string (p, "O") &&
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parse_coordinate_pair (p, &x5, &y5) &&
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parse_coordinate_pair (p, &x6, &y6) &&
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parse_nonnegative_number (p, &w1) &&
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parse_string (p, "L") &&
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parse_coordinate_pair (p, &x7, &y7) &&
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parse_string (p, "O") &&
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parse_coordinate_pair (p, &x8, &y8) &&
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parse_coordinate_pair (p, &x9, &y9) &&
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parse_nonnegative_number (p, &w2) &&
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parse_string (p, "L") &&
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parse_coordinate_pair (p, &x10, &y10) &&
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parse_string (p, "O") &&
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parse_coordinate_pair (p, &x11, &y11) &&
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parse_coordinate_pair (p, &x12, &y12) &&
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parse_nonnegative_number (p, &w3) &&
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parse_string (p, "Z"))
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{
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if (NEAR (x0, x12) && NEAR (y0, y12) &&
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is_rect (x11, y11, x2, y2, x5, y5, x8, y8) &&
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is_line (x11, y11, x0, y0, x1, y1, x2, y2) &&
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is_line (x2, y2, x3, y3, x4, y4, x5, y5) &&
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is_line (x8, y8, x7, y7, x6, y6, x5, y5) &&
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is_line (x11, y11, x10, y10, x9, y9, x8, y8) &&
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NEAR (w0, M_SQRT1_2) && NEAR (w1, M_SQRT1_2) &&
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NEAR (w2, M_SQRT1_2) && NEAR (w3, M_SQRT1_2))
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{
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rr->bounds = GRAPHENE_RECT_INIT (x11, y11, x5 - x11, y5 - y11);
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rr->corner[GSK_CORNER_TOP_LEFT] = GRAPHENE_SIZE_INIT (x12 - x11, y10 - y11);
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rr->corner[GSK_CORNER_TOP_RIGHT] = GRAPHENE_SIZE_INIT (x2 - x1, y3 - y2);
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rr->corner[GSK_CORNER_BOTTOM_RIGHT] = GRAPHENE_SIZE_INIT (x5 - x6, y5 - y4);
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rr->corner[GSK_CORNER_BOTTOM_LEFT] = GRAPHENE_SIZE_INIT (x7 - x8, y8 - y9);
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skip_whitespace (p);
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return TRUE;
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}
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}
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*p = o;
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return FALSE;
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}
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#undef NEAR
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/**
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* gsk_path_parse:
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* @string: a string
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*
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* This is a convenience function that constructs a `GskPath`
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* from a serialized form.
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*
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* The string is expected to be in (a superset of)
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* [SVG path syntax](https://www.w3.org/TR/SVG11/paths.html#PathData),
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* as e.g. produced by [method@Gsk.Path.to_string].
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*
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* A high-level summary of the syntax:
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*
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* - `M x y` Move to `(x, y)`
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* - `L x y` Add a line from the current point to `(x, y)`
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* - `Q x1 y1 x2 y2` Add a quadratic Bézier from the current point to `(x2, y2)`, with control point `(x1, y1)`
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* - `C x1 y1 x2 y2 x3 y3` Add a cubic Bézier from the current point to `(x3, y3)`, with control points `(x1, y1)` and `(x2, y2)`
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* - `Z` Close the contour by drawing a line back to the start point
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* - `H x` Add a horizontal line from the current point to the given x value
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* - `V y` Add a vertical line from the current point to the given y value
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* - `T x2 y2` Add a quadratic Bézier, using the reflection of the previous segments' control point as control point
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* - `S x2 y2 x3 y3` Add a cubic Bézier, using the reflection of the previous segments' second control point as first control point
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* - `A rx ry r l s x y` Add an elliptical arc from the current point to `(x, y)` with radii rx and ry. See the SVG documentation for how the other parameters influence the arc.
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* - `O x1 y1 x2 y2 w` Add a rational quadratic Bézier from the current point to `(x2, y2)` with control point `(x1, y1)` and weight `w`.
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*
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* All the commands have lowercase variants that interpret coordinates
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* relative to the current point.
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*
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* The `O` command is an extension that is not supported in SVG.
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*
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* Returns: (nullable): a new `GskPath`, or `NULL` if @string could not be parsed
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*
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* Since: 4.14
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*/
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GskPath *
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gsk_path_parse (const char *string)
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{
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GskPathBuilder *builder;
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double x, y;
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double prev_x1, prev_y1;
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double path_x, path_y;
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const char *p;
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char cmd;
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char prev_cmd;
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gboolean after_comma;
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gboolean repeat;
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builder = gsk_path_builder_new ();
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cmd = 'X';
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path_x = path_y = 0;
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x = y = 0;
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prev_x1 = prev_y1 = 0;
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after_comma = FALSE;
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p = string;
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while (*p)
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{
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prev_cmd = cmd;
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repeat = !parse_command (&p, &cmd);
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if (after_comma && !repeat)
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goto error;
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switch (cmd)
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{
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case 'X':
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goto error;
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case 'Z':
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case 'z':
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if (repeat)
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goto error;
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else
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{
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gsk_path_builder_close (builder);
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x = path_x;
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y = path_y;
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}
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break;
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case 'M':
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case 'm':
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{
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double x1, y1, w, h, r;
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GskRoundedRect rr;
|
|
|
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/* Look for special contours */
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if (parse_rectangle (&p, &x1, &y1, &w, &h))
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{
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gsk_path_builder_add_rect (builder, &GRAPHENE_RECT_INIT (x1, y1, w, h));
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if (_strchr ("zZX", prev_cmd))
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{
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path_x = x1;
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path_y = y1;
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}
|
|
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x = x1;
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y = y1;
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}
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else if (parse_circle (&p, &x1, &y1, &r))
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{
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gsk_path_builder_add_circle (builder, &GRAPHENE_POINT_INIT (x1, y1), r);
|
|
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if (_strchr ("zZX", prev_cmd))
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{
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path_x = x1 + r;
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path_y = y1;
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}
|
|
|
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x = x1 + r;
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y = y1;
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}
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else if (parse_rounded_rect (&p, &rr))
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{
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gsk_path_builder_add_rounded_rect (builder, &rr);
|
|
|
|
if (_strchr ("zZX", prev_cmd))
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{
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path_x = rr.bounds.origin.x + rr.corner[GSK_CORNER_TOP_LEFT].width;
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path_y = rr.bounds.origin.y;
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}
|
|
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x = rr.bounds.origin.x + rr.corner[GSK_CORNER_TOP_LEFT].width;
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y = rr.bounds.origin.y;
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}
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else if (parse_coordinate_pair (&p, &x1, &y1))
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{
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if (cmd == 'm')
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{
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x1 += x;
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y1 += y;
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}
|
|
|
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if (repeat)
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gsk_path_builder_line_to (builder, x1, y1);
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|
else
|
|
{
|
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gsk_path_builder_move_to (builder, x1, y1);
|
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if (_strchr ("zZX", prev_cmd))
|
|
{
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path_x = x1;
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path_y = y1;
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}
|
|
}
|
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x = x1;
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y = y1;
|
|
}
|
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else
|
|
goto error;
|
|
}
|
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break;
|
|
|
|
case 'L':
|
|
case 'l':
|
|
{
|
|
double x1, y1;
|
|
|
|
if (parse_coordinate_pair (&p, &x1, &y1))
|
|
{
|
|
if (cmd == 'l')
|
|
{
|
|
x1 += x;
|
|
y1 += y;
|
|
}
|
|
|
|
if (_strchr ("zZ", prev_cmd))
|
|
{
|
|
gsk_path_builder_move_to (builder, x, y);
|
|
path_x = x;
|
|
path_y = y;
|
|
}
|
|
gsk_path_builder_line_to (builder, x1, y1);
|
|
x = x1;
|
|
y = y1;
|
|
}
|
|
else
|
|
goto error;
|
|
}
|
|
break;
|
|
|
|
case 'H':
|
|
case 'h':
|
|
{
|
|
double x1;
|
|
|
|
if (parse_coordinate (&p, &x1))
|
|
{
|
|
if (cmd == 'h')
|
|
x1 += x;
|
|
if (_strchr ("zZ", prev_cmd))
|
|
{
|
|
gsk_path_builder_move_to (builder, x, y);
|
|
path_x = x;
|
|
path_y = y;
|
|
}
|
|
gsk_path_builder_line_to (builder, x1, y);
|
|
x = x1;
|
|
}
|
|
else
|
|
goto error;
|
|
}
|
|
break;
|
|
|
|
case 'V':
|
|
case 'v':
|
|
{
|
|
double y1;
|
|
|
|
if (parse_coordinate (&p, &y1))
|
|
{
|
|
if (cmd == 'v')
|
|
y1 += y;
|
|
if (_strchr ("zZ", prev_cmd))
|
|
{
|
|
gsk_path_builder_move_to (builder, x, y);
|
|
path_x = x;
|
|
path_y = y;
|
|
}
|
|
gsk_path_builder_line_to (builder, x, y1);
|
|
y = y1;
|
|
}
|
|
else
|
|
goto error;
|
|
}
|
|
break;
|
|
|
|
case 'C':
|
|
case 'c':
|
|
{
|
|
double x0, y0, x1, y1, x2, y2;
|
|
|
|
if (parse_coordinate_pair (&p, &x0, &y0) &&
|
|
parse_coordinate_pair (&p, &x1, &y1) &&
|
|
parse_coordinate_pair (&p, &x2, &y2))
|
|
{
|
|
if (cmd == 'c')
|
|
{
|
|
x0 += x;
|
|
y0 += y;
|
|
x1 += x;
|
|
y1 += y;
|
|
x2 += x;
|
|
y2 += y;
|
|
}
|
|
if (_strchr ("zZ", prev_cmd))
|
|
{
|
|
gsk_path_builder_move_to (builder, x, y);
|
|
path_x = x;
|
|
path_y = y;
|
|
}
|
|
gsk_path_builder_cubic_to (builder, x0, y0, x1, y1, x2, y2);
|
|
prev_x1 = x1;
|
|
prev_y1 = y1;
|
|
x = x2;
|
|
y = y2;
|
|
}
|
|
else
|
|
goto error;
|
|
}
|
|
break;
|
|
|
|
case 'S':
|
|
case 's':
|
|
{
|
|
double x0, y0, x1, y1, x2, y2;
|
|
|
|
if (parse_coordinate_pair (&p, &x1, &y1) &&
|
|
parse_coordinate_pair (&p, &x2, &y2))
|
|
{
|
|
if (cmd == 's')
|
|
{
|
|
x1 += x;
|
|
y1 += y;
|
|
x2 += x;
|
|
y2 += y;
|
|
}
|
|
if (_strchr ("CcSs", prev_cmd))
|
|
{
|
|
x0 = 2 * x - prev_x1;
|
|
y0 = 2 * y - prev_y1;
|
|
}
|
|
else
|
|
{
|
|
x0 = x;
|
|
y0 = y;
|
|
}
|
|
if (_strchr ("zZ", prev_cmd))
|
|
{
|
|
gsk_path_builder_move_to (builder, x, y);
|
|
path_x = x;
|
|
path_y = y;
|
|
}
|
|
gsk_path_builder_cubic_to (builder, x0, y0, x1, y1, x2, y2);
|
|
prev_x1 = x1;
|
|
prev_y1 = y1;
|
|
x = x2;
|
|
y = y2;
|
|
}
|
|
else
|
|
goto error;
|
|
}
|
|
break;
|
|
|
|
case 'Q':
|
|
case 'q':
|
|
{
|
|
double x1, y1, x2, y2;
|
|
|
|
if (parse_coordinate_pair (&p, &x1, &y1) &&
|
|
parse_coordinate_pair (&p, &x2, &y2))
|
|
{
|
|
if (cmd == 'q')
|
|
{
|
|
x1 += x;
|
|
y1 += y;
|
|
x2 += x;
|
|
y2 += y;
|
|
}
|
|
if (_strchr ("zZ", prev_cmd))
|
|
{
|
|
gsk_path_builder_move_to (builder, x, y);
|
|
path_x = x;
|
|
path_y = y;
|
|
}
|
|
gsk_path_builder_quad_to (builder, x1, y1, x2, y2);
|
|
prev_x1 = x1;
|
|
prev_y1 = y1;
|
|
x = x2;
|
|
y = y2;
|
|
}
|
|
else
|
|
goto error;
|
|
}
|
|
break;
|
|
|
|
case 'T':
|
|
case 't':
|
|
{
|
|
double x1, y1, x2, y2;
|
|
|
|
if (parse_coordinate_pair (&p, &x2, &y2))
|
|
{
|
|
if (cmd == 't')
|
|
{
|
|
x2 += x;
|
|
y2 += y;
|
|
}
|
|
if (_strchr ("QqTt", prev_cmd))
|
|
{
|
|
x1 = 2 * x - prev_x1;
|
|
y1 = 2 * y - prev_y1;
|
|
}
|
|
else
|
|
{
|
|
x1 = x;
|
|
y1 = y;
|
|
}
|
|
if (_strchr ("zZ", prev_cmd))
|
|
{
|
|
gsk_path_builder_move_to (builder, x, y);
|
|
path_x = x;
|
|
path_y = y;
|
|
}
|
|
gsk_path_builder_quad_to (builder, x1, y1, x2, y2);
|
|
prev_x1 = x1;
|
|
prev_y1 = y1;
|
|
x = x2;
|
|
y = y2;
|
|
}
|
|
else
|
|
goto error;
|
|
}
|
|
break;
|
|
|
|
case 'O':
|
|
case 'o':
|
|
{
|
|
double x1, y1, x2, y2, weight;
|
|
|
|
if (parse_coordinate_pair (&p, &x1, &y1) &&
|
|
parse_coordinate_pair (&p, &x2, &y2) &&
|
|
parse_nonnegative_number (&p, &weight))
|
|
{
|
|
if (cmd == 'o')
|
|
{
|
|
x1 += x;
|
|
y1 += y;
|
|
x2 += x;
|
|
y2 += y;
|
|
}
|
|
if (_strchr ("zZ", prev_cmd))
|
|
{
|
|
gsk_path_builder_move_to (builder, x, y);
|
|
path_x = x;
|
|
path_y = y;
|
|
}
|
|
gsk_path_builder_conic_to (builder, x1, y1, x2, y2, weight);
|
|
x = x2;
|
|
y = y2;
|
|
}
|
|
else
|
|
goto error;
|
|
}
|
|
break;
|
|
|
|
case 'A':
|
|
case 'a':
|
|
{
|
|
double rx, ry;
|
|
double x_axis_rotation;
|
|
int large_arc, sweep;
|
|
double x1, y1;
|
|
|
|
if (parse_nonnegative_number (&p, &rx) &&
|
|
parse_nonnegative_number (&p, &ry) &&
|
|
parse_number (&p, &x_axis_rotation) &&
|
|
parse_flag (&p, &large_arc) &&
|
|
parse_flag (&p, &sweep) &&
|
|
parse_coordinate_pair (&p, &x1, &y1))
|
|
{
|
|
if (cmd == 'a')
|
|
{
|
|
x1 += x;
|
|
y1 += y;
|
|
}
|
|
|
|
if (_strchr ("zZ", prev_cmd))
|
|
{
|
|
gsk_path_builder_move_to (builder, x, y);
|
|
path_x = x;
|
|
path_y = y;
|
|
}
|
|
gsk_path_builder_svg_arc_to (builder,
|
|
rx, ry, x_axis_rotation,
|
|
large_arc, sweep,
|
|
x1, y1);
|
|
x = x1;
|
|
y = y1;
|
|
}
|
|
else
|
|
goto error;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
goto error;
|
|
}
|
|
|
|
after_comma = (p > string) && p[-1] == ',';
|
|
}
|
|
|
|
if (after_comma)
|
|
goto error;
|
|
|
|
return gsk_path_builder_free_to_path (builder);
|
|
|
|
error:
|
|
//g_warning ("Can't parse string '%s' as GskPath, error at %ld", string, p - string);
|
|
gsk_path_builder_unref (builder);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* vim:set foldmethod=marker expandtab: */
|