static cairo_status_t
_cairo_stroker_init (cairo_stroker_t *stroker,
const cairo_stroke_style_t *stroke_style,
const cairo_matrix_t *ctm,
const cairo_matrix_t *ctm_inverse,
double tolerance)
{
cairo_status_t status;
stroker->style = *stroke_style;
stroker->ctm = ctm;
stroker->ctm_inverse = ctm_inverse;
stroker->tolerance = tolerance;
stroker->ctm_determinant = _cairo_matrix_compute_determinant (stroker->ctm);
stroker->ctm_det_positive = stroker->ctm_determinant >= 0.0;
status = _cairo_pen_init (&stroker->pen,
stroke_style->line_width / 2.0,
tolerance, ctm);
if (unlikely (status))
return status;
stroker->has_bounds = FALSE;
stroker->has_current_face = FALSE;
stroker->has_first_face = FALSE;
stroker->has_initial_sub_path = FALSE;
_cairo_stroker_dash_init (&stroker->dash, stroke_style);
stroker->add_external_edge = NULL;
return CAIRO_STATUS_SUCCESS;
}
static cairo_bool_t
_cairo_rectilinear_stroker_init (cairo_rectilinear_stroker_t *stroker,
const cairo_stroke_style_t *stroke_style,
const cairo_matrix_t *ctm,
cairo_antialias_t antialias,
cairo_boxes_t *boxes)
{
/* This special-case rectilinear stroker only supports
* miter-joined lines (not curves) and a translation-only matrix
* (though it could probably be extended to support a matrix with
* uniform, integer scaling).
*
* It also only supports horizontal and vertical line_to
* elements. But we don't catch that here, but instead return
* UNSUPPORTED from _cairo_rectilinear_stroker_line_to if any
* non-rectilinear line_to is encountered.
*/
if (stroke_style->line_join != CAIRO_LINE_JOIN_MITER)
return FALSE;
/* If the miter limit turns right angles into bevels, then we
* can't use this optimization. Remember, the ratio is
* 1/sin(ɸ/2). So the cutoff is 1/sin(π/4.0) or ⎷2,
* which we round for safety. */
if (stroke_style->miter_limit < M_SQRT2)
return FALSE;
//TODO PROBABLY NOT add LINE_CAP_TRIANGULAR
if (! (stroke_style->line_cap == CAIRO_LINE_CAP_BUTT ||
stroke_style->line_cap == CAIRO_LINE_CAP_SQUARE))
{
return FALSE;
}
if (! _cairo_matrix_is_scale (ctm))
return FALSE;
stroker->stroke_style = stroke_style;
stroker->ctm = ctm;
stroker->antialias = antialias;
stroker->half_line_x =
_cairo_fixed_from_double (fabs(ctm->xx) * stroke_style->line_width / 2.0);
stroker->half_line_y =
_cairo_fixed_from_double (fabs(ctm->yy) * stroke_style->line_width / 2.0);
stroker->open_sub_path = FALSE;
stroker->segments = stroker->segments_embedded;
stroker->segments_size = ARRAY_LENGTH (stroker->segments_embedded);
stroker->num_segments = 0;
_cairo_stroker_dash_init (&stroker->dash, stroke_style);
stroker->has_bounds = FALSE;
stroker->boxes = boxes;
return TRUE;
}
static cairo_status_t
_cairo_stroker_init (cairo_stroker_t *stroker,
cairo_stroke_style_t *stroke_style,
const cairo_matrix_t *ctm,
const cairo_matrix_t *ctm_inverse,
double tolerance,
cairo_traps_t *traps)
{
cairo_status_t status;
stroker->style = stroke_style;
stroker->ctm = ctm;
stroker->ctm_inverse = ctm_inverse;
stroker->tolerance = tolerance;
stroker->traps = traps;
stroker->ctm_determinant = _cairo_matrix_compute_determinant (stroker->ctm);
stroker->ctm_det_positive = stroker->ctm_determinant >= 0.0;
status = _cairo_pen_init (&stroker->pen,
stroke_style->line_width / 2.0,
tolerance, ctm);
if (unlikely (status))
return status;
stroker->has_current_face = FALSE;
stroker->has_first_face = FALSE;
stroker->has_initial_sub_path = FALSE;
_cairo_stroker_dash_init (&stroker->dash, stroke_style);
stroker->has_bounds = _cairo_traps_get_limit (traps, &stroker->bounds);
if (stroker->has_bounds) {
/* Extend the bounds in each direction to account for the maximum area
* we might generate trapezoids, to capture line segments that are outside
* of the bounds but which might generate rendering that's within bounds.
*/
double dx, dy;
cairo_fixed_t fdx, fdy;
_cairo_stroke_style_max_distance_from_path (stroker->style,
stroker->ctm,
&dx, &dy);
fdx = _cairo_fixed_from_double (dx);
stroker->bounds.p1.x -= fdx;
stroker->bounds.p2.x += fdx;
fdy = _cairo_fixed_from_double (dy);
stroker->bounds.p1.y -= fdy;
stroker->bounds.p2.y += fdy;
}
return CAIRO_STATUS_SUCCESS;
}
static void
_cairo_rectilinear_stroker_init (cairo_rectilinear_stroker_t *stroker,
cairo_stroke_style_t *stroke_style,
const cairo_matrix_t *ctm,
cairo_traps_t *traps)
{
stroker->stroke_style = stroke_style;
stroker->ctm = ctm;
stroker->half_line_width =
_cairo_fixed_from_double (stroke_style->line_width / 2.0);
stroker->traps = traps;
stroker->open_sub_path = FALSE;
stroker->segments = stroker->segments_embedded;
stroker->segments_size = ARRAY_LENGTH (stroker->segments_embedded);
stroker->num_segments = 0;
_cairo_stroker_dash_init (&stroker->dash, stroke_style);
stroker->has_bounds = FALSE;
}
