cairo_int_status_t
_cairo_path_fixed_stroke_to_traps (const cairo_path_fixed_t *path,
const cairo_stroke_style_t *stroke_style,
const cairo_matrix_t *ctm,
const cairo_matrix_t *ctm_inverse,
double tolerance,
cairo_traps_t *traps)
{
cairo_int_status_t status;
cairo_polygon_t polygon;
_cairo_polygon_init (&polygon, traps->limits, traps->num_limits);
status = _cairo_path_fixed_stroke_to_polygon (path,
stroke_style,
ctm,
ctm_inverse,
tolerance,
&polygon);
if (unlikely (status))
goto BAIL;
status = _cairo_polygon_status (&polygon);
if (unlikely (status))
goto BAIL;
status = _cairo_bentley_ottmann_tessellate_polygon (traps, &polygon,
CAIRO_FILL_RULE_WINDING);
BAIL:
_cairo_polygon_fini (&polygon);
return status;
}
/* Compute outline of a given spline using the pen.
The trapezoids needed to fill that outline will be added to traps
*/
cairo_status_t
_cairo_pen_stroke_spline (cairo_pen_t *pen,
cairo_spline_t *spline,
double tolerance,
cairo_traps_t *traps)
{
cairo_status_t status;
cairo_polygon_t polygon;
/* If the line width is so small that the pen is reduced to a
single point, then we have nothing to do. */
if (pen->num_vertices <= 1)
return CAIRO_STATUS_SUCCESS;
_cairo_polygon_init (&polygon);
status = _cairo_spline_decompose (spline, tolerance);
if (status)
goto BAIL;
_cairo_pen_stroke_spline_half (pen, spline, CAIRO_DIRECTION_FORWARD, &polygon);
_cairo_pen_stroke_spline_half (pen, spline, CAIRO_DIRECTION_REVERSE, &polygon);
_cairo_polygon_close (&polygon);
status = _cairo_polygon_status (&polygon);
if (status)
goto BAIL;
status = _cairo_bentley_ottmann_tessellate_polygon (traps, &polygon, CAIRO_FILL_RULE_WINDING);
BAIL:
_cairo_polygon_fini (&polygon);
return status;
}
cairo_status_t
_cairo_path_fixed_fill_to_polygon (const cairo_path_fixed_t *path,
double tolerance,
cairo_polygon_t *polygon)
{
cairo_filler_t filler;
cairo_status_t status;
_cairo_filler_init (&filler, tolerance, polygon);
status = _cairo_path_fixed_interpret (path,
CAIRO_DIRECTION_FORWARD,
_cairo_filler_move_to,
_cairo_filler_line_to,
_cairo_filler_curve_to,
_cairo_filler_close_path,
&filler);
if (unlikely (status))
return status;
_cairo_polygon_close (polygon);
status = _cairo_polygon_status (polygon);
_cairo_filler_fini (&filler);
return status;
}
cairo_status_t
_cairo_polygon_add_external_edge (void *polygon,
const cairo_point_t *p1,
const cairo_point_t *p2)
{
_cairo_polygon_add_edge (polygon, p1, p2, 1);
return _cairo_polygon_status (polygon);
}
static cairo_status_t
_cairo_filler_close_path (void *closure)
{
cairo_filler_t *filler = closure;
cairo_polygon_t *polygon = &filler->polygon;
_cairo_polygon_close (polygon);
return _cairo_polygon_status (polygon);
}
static cairo_status_t
_cairo_filler_line_to (void *closure, cairo_point_t *point)
{
cairo_filler_t *filler = closure;
cairo_polygon_t *polygon = &filler->polygon;
_cairo_polygon_line_to (polygon, point);
filler->current_point = *point;
return _cairo_polygon_status (&filler->polygon);
}
cairo_status_t
_cairo_path_fixed_fill_to_traps (cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_traps_t *traps)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
cairo_filler_t filler;
/* Before we do anything else, we use a special-case filler for
* a device-axis aligned rectangle if possible. */
status = _cairo_path_fixed_fill_rectangle (path, traps);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
_cairo_filler_init (&filler, tolerance, traps);
status = _cairo_path_fixed_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;
_cairo_polygon_close (&filler.polygon);
status = _cairo_polygon_status (&filler.polygon);
if (status)
goto BAIL;
status = _cairo_bentley_ottmann_tessellate_polygon (filler.traps,
&filler.polygon,
fill_rule);
if (status)
goto BAIL;
BAIL:
_cairo_filler_fini (&filler);
return status;
}
static cairo_status_t
_cairo_stroker_add_cap (cairo_stroker_t *stroker, cairo_stroke_face_t *f)
{
cairo_status_t status;
if (stroker->style->line_cap == CAIRO_LINE_CAP_BUTT)
return CAIRO_STATUS_SUCCESS;
switch (stroker->style->line_cap) {
case CAIRO_LINE_CAP_ROUND: {
int i;
int start, stop;
cairo_slope_t slope;
cairo_point_t tri[3];
cairo_pen_t *pen = &stroker->pen;
slope = f->dev_vector;
start = _cairo_pen_find_active_cw_vertex_index (pen, &slope);
slope.dx = -slope.dx;
slope.dy = -slope.dy;
stop = _cairo_pen_find_active_cw_vertex_index (pen, &slope);
tri[0] = f->point;
tri[1] = f->cw;
for (i=start; i != stop; i = (i+1) % pen->num_vertices) {
tri[2] = f->point;
_translate_point (&tri[2], &pen->vertices[i].point);
status = _cairo_traps_tessellate_triangle (stroker->traps, tri);
if (unlikely (status))
return status;
tri[1] = tri[2];
}
tri[2] = f->ccw;
return _cairo_traps_tessellate_triangle (stroker->traps, tri);
}
case CAIRO_LINE_CAP_SQUARE: {
double dx, dy;
cairo_slope_t fvector;
cairo_point_t occw, ocw;
cairo_polygon_t polygon;
dx = f->usr_vector.x;
dy = f->usr_vector.y;
dx *= stroker->style->line_width / 2.0;
dy *= stroker->style->line_width / 2.0;
cairo_matrix_transform_distance (stroker->ctm, &dx, &dy);
fvector.dx = _cairo_fixed_from_double (dx);
fvector.dy = _cairo_fixed_from_double (dy);
occw.x = f->ccw.x + fvector.dx;
occw.y = f->ccw.y + fvector.dy;
ocw.x = f->cw.x + fvector.dx;
ocw.y = f->cw.y + fvector.dy;
_cairo_polygon_init (&polygon);
_cairo_polygon_move_to (&polygon, &f->cw);
_cairo_polygon_line_to (&polygon, &ocw);
_cairo_polygon_line_to (&polygon, &occw);
_cairo_polygon_line_to (&polygon, &f->ccw);
_cairo_polygon_close (&polygon);
status = _cairo_polygon_status (&polygon);
if (status == CAIRO_STATUS_SUCCESS) {
status = _cairo_bentley_ottmann_tessellate_polygon (stroker->traps,
&polygon,
CAIRO_FILL_RULE_WINDING);
}
_cairo_polygon_fini (&polygon);
return status;
}
case CAIRO_LINE_CAP_BUTT:
default:
return CAIRO_STATUS_SUCCESS;
}
}