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/* cairo - a vector graphics library with display and print output
*
* Copyright © 2002 University of Southern California
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Carl D. Worth <cworth@isi.edu>
*/
#include "cairoint.h"
typedef struct cairo_filler {
cairo_gstate_t *gstate;
cairo_traps_t *traps;
cairo_point_t current_point;
cairo_polygon_t polygon;
} cairo_filler_t;
static void
_cairo_filler_init (cairo_filler_t *filler, cairo_gstate_t *gstate, cairo_traps_t *traps);
static void
_cairo_filler_fini (cairo_filler_t *filler);
static cairo_status_t
_cairo_filler_move_to (void *closure, cairo_point_t *point);
static cairo_status_t
_cairo_filler_line_to (void *closure, cairo_point_t *point);
static cairo_status_t
_cairo_filler_curve_to (void *closure,
cairo_point_t *b,
cairo_point_t *c,
cairo_point_t *d);
static cairo_status_t
_cairo_filler_close_path (void *closure);
static void
_cairo_filler_init (cairo_filler_t *filler, cairo_gstate_t *gstate, cairo_traps_t *traps)
{
filler->gstate = gstate;
filler->traps = traps;
filler->current_point.x = 0;
filler->current_point.y = 0;
_cairo_polygon_init (&filler->polygon);
}
static void
_cairo_filler_fini (cairo_filler_t *filler)
{
_cairo_polygon_fini (&filler->polygon);
}
static cairo_status_t
_cairo_filler_move_to (void *closure, cairo_point_t *point)
{
cairo_status_t status;
cairo_filler_t *filler = closure;
cairo_polygon_t *polygon = &filler->polygon;
status = _cairo_polygon_close (polygon);
if (status)
return status;
status = _cairo_polygon_move_to (polygon, point);
if (status)
return status;
filler->current_point = *point;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_filler_line_to (void *closure, cairo_point_t *point)
{
cairo_status_t status;
cairo_filler_t *filler = closure;
cairo_polygon_t *polygon = &filler->polygon;
status = _cairo_polygon_line_to (polygon, point);
if (status)
return status;
filler->current_point = *point;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_filler_curve_to (void *closure,
cairo_point_t *b,
cairo_point_t *c,
cairo_point_t *d)
{
int i;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
cairo_filler_t *filler = closure;
cairo_polygon_t *polygon = &filler->polygon;
cairo_gstate_t *gstate = filler->gstate;
cairo_spline_t spline;
status = _cairo_spline_init (&spline, &filler->current_point, b, c, d);
if (status == CAIRO_INT_STATUS_DEGENERATE)
return CAIRO_STATUS_SUCCESS;
_cairo_spline_decompose (&spline, gstate->tolerance);
if (status)
goto CLEANUP_SPLINE;
for (i = 1; i < spline.num_points; i++) {
status = _cairo_polygon_line_to (polygon, &spline.points[i]);
if (status)
break;
}
CLEANUP_SPLINE:
_cairo_spline_fini (&spline);
filler->current_point = *d;
return status;
}
static cairo_status_t
_cairo_filler_close_path (void *closure)
{
cairo_status_t status;
cairo_filler_t *filler = closure;
cairo_polygon_t *polygon = &filler->polygon;
status = _cairo_polygon_close (polygon);
if (status)
return status;
return CAIRO_STATUS_SUCCESS;
}
cairo_status_t
_cairo_path_fill_to_traps (cairo_path_t *path, cairo_gstate_t *gstate, cairo_traps_t *traps)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
cairo_filler_t filler;
_cairo_filler_init (&filler, gstate, traps);
status = _cairo_path_interpret (path,
CAIRO_DIRECTION_FORWARD,
_cairo_filler_move_to,
_cairo_filler_line_to,
_cairo_filler_curve_to,
_cairo_filler_close_path,
&filler);
if (status)
goto BAIL;
status = _cairo_polygon_close (&filler.polygon);
if (status)
goto BAIL;
status = _cairo_traps_tessellate_polygon (filler.traps,
&filler.polygon,
filler.gstate->fill_rule);
if (status)
goto BAIL;
BAIL:
_cairo_filler_fini (&filler);
return status;
}
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