static cairo_status_t
line_to (void *closure,
const cairo_point_t *point)
{
struct stroker *stroker = closure;
cairo_stroke_face_t start;
cairo_point_t *p1 = &stroker->current_face.point;
cairo_slope_t dev_slope;
stroker->has_initial_sub_path = TRUE;
if (p1->x == point->x && p1->y == point->y)
return CAIRO_STATUS_SUCCESS;
#if DEBUG
_cairo_contour_add_point (&stroker->path, point);
#endif
_cairo_slope_init (&dev_slope, p1, point);
compute_face (p1, &dev_slope, stroker, &start);
if (stroker->has_current_face) {
int clockwise = _cairo_slope_compare (&stroker->current_face.dev_vector,
&start.dev_vector);
if (clockwise) {
clockwise = clockwise < 0;
/* Join with final face from previous segment */
if (! within_tolerance (&stroker->current_face.ccw, &start.ccw,
stroker->contour_tolerance) ||
! within_tolerance (&stroker->current_face.cw, &start.cw,
stroker->contour_tolerance))
{
outer_join (stroker, &stroker->current_face, &start, clockwise);
inner_join (stroker, &stroker->current_face, &start, clockwise);
}
}
} else {
if (! stroker->has_first_face) {
/* Save sub path's first face in case needed for closing join */
stroker->first_face = start;
stroker->has_first_face = TRUE;
}
stroker->has_current_face = TRUE;
contour_add_point (stroker, &stroker->cw, &start.cw);
contour_add_point (stroker, &stroker->ccw, &start.ccw);
}
stroker->current_face = start;
stroker->current_face.point = *point;
stroker->current_face.ccw.x += dev_slope.dx;
stroker->current_face.ccw.y += dev_slope.dy;
stroker->current_face.cw.x += dev_slope.dx;
stroker->current_face.cw.y += dev_slope.dy;
contour_add_point (stroker, &stroker->cw, &stroker->current_face.cw);
contour_add_point (stroker, &stroker->ccw, &stroker->current_face.ccw);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
line_to (void *closure,
const cairo_point_t *point)
{
struct stroker *stroker = closure;
cairo_stroke_face_t start;
cairo_point_t *p1 = &stroker->current_face.point;
cairo_slope_t dev_slope;
stroker->has_sub_path = TRUE;
if (p1->x == point->x && p1->y == point->y)
return CAIRO_STATUS_SUCCESS;
_cairo_slope_init (&dev_slope, p1, point);
compute_face (p1, &dev_slope, stroker, &start);
if (stroker->has_current_face) {
int clockwise = join_is_clockwise (&stroker->current_face, &start);
/* Join with final face from previous segment */
outer_join (stroker, &stroker->current_face, &start, clockwise);
inner_join (stroker, &stroker->current_face, &start, clockwise);
} else {
if (! stroker->has_first_face) {
/* Save sub path's first face in case needed for closing join */
stroker->first_face = start;
_cairo_tristrip_move_to (stroker->strip, &start.cw);
stroker->has_first_face = TRUE;
}
stroker->has_current_face = TRUE;
_cairo_tristrip_add_point (stroker->strip, &start.cw);
_cairo_tristrip_add_point (stroker->strip, &start.ccw);
}
stroker->current_face = start;
stroker->current_face.point = *point;
stroker->current_face.ccw.x += dev_slope.dx;
stroker->current_face.ccw.y += dev_slope.dy;
stroker->current_face.cw.x += dev_slope.dx;
stroker->current_face.cw.y += dev_slope.dy;
_cairo_tristrip_add_point (stroker->strip, &stroker->current_face.cw);
_cairo_tristrip_add_point (stroker->strip, &stroker->current_face.ccw);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
curve_to (void *closure,
const cairo_point_t *b,
const cairo_point_t *c,
const cairo_point_t *d)
{
struct stroker *stroker = closure;
cairo_spline_t spline;
cairo_stroke_face_t face;
if (stroker->has_limits) {
if (! _cairo_spline_intersects (&stroker->current_face.point, b, c, d,
&stroker->limit))
return line_to (closure, d);
}
if (! _cairo_spline_init (&spline, spline_to, stroker,
&stroker->current_face.point, b, c, d))
return line_to (closure, d);
compute_face (&stroker->current_face.point, &spline.initial_slope,
stroker, &face);
if (stroker->has_current_face) {
int clockwise = join_is_clockwise (&stroker->current_face, &face);
/* Join with final face from previous segment */
outer_join (stroker, &stroker->current_face, &face, clockwise);
inner_join (stroker, &stroker->current_face, &face, clockwise);
} else {
if (! stroker->has_first_face) {
/* Save sub path's first face in case needed for closing join */
stroker->first_face = face;
_cairo_tristrip_move_to (stroker->strip, &face.cw);
stroker->has_first_face = TRUE;
}
stroker->has_current_face = TRUE;
_cairo_tristrip_add_point (stroker->strip, &face.cw);
_cairo_tristrip_add_point (stroker->strip, &face.ccw);
}
stroker->current_face = face;
return _cairo_spline_decompose (&spline, stroker->tolerance);
}
