cairo_bool_t
_cairo_traps_to_boxes (cairo_traps_t *traps,
cairo_antialias_t antialias,
cairo_boxes_t *boxes)
{
int i;
for (i = 0; i < traps->num_traps; i++) {
if (traps->traps[i].left.p1.x != traps->traps[i].left.p2.x ||
traps->traps[i].right.p1.x != traps->traps[i].right.p2.x)
return FALSE;
}
_cairo_boxes_init (boxes);
boxes->num_boxes = traps->num_traps;
boxes->chunks.base = (cairo_box_t *) traps->traps;
boxes->chunks.count = traps->num_traps;
boxes->chunks.size = traps->num_traps;
if (antialias != CAIRO_ANTIALIAS_NONE) {
for (i = 0; i < traps->num_traps; i++) {
/* Note the traps and boxes alias so we need to take the local copies first. */
cairo_fixed_t x1 = traps->traps[i].left.p1.x;
cairo_fixed_t x2 = traps->traps[i].right.p1.x;
cairo_fixed_t y1 = traps->traps[i].top;
cairo_fixed_t y2 = traps->traps[i].bottom;
boxes->chunks.base[i].p1.x = x1;
boxes->chunks.base[i].p1.y = y1;
boxes->chunks.base[i].p2.x = x2;
boxes->chunks.base[i].p2.y = y2;
if (boxes->is_pixel_aligned) {
boxes->is_pixel_aligned =
_cairo_fixed_is_integer (x1) && _cairo_fixed_is_integer (y1) &&
_cairo_fixed_is_integer (x2) && _cairo_fixed_is_integer (y2);
}
}
} else {
boxes->is_pixel_aligned = TRUE;
for (i = 0; i < traps->num_traps; i++) {
/* Note the traps and boxes alias so we need to take the local copies first. */
cairo_fixed_t x1 = traps->traps[i].left.p1.x;
cairo_fixed_t x2 = traps->traps[i].right.p1.x;
cairo_fixed_t y1 = traps->traps[i].top;
cairo_fixed_t y2 = traps->traps[i].bottom;
/* round down here to match Pixman's behavior when using traps. */
boxes->chunks.base[i].p1.x = _cairo_fixed_round_down (x1);
boxes->chunks.base[i].p1.y = _cairo_fixed_round_down (y1);
boxes->chunks.base[i].p2.x = _cairo_fixed_round_down (x2);
boxes->chunks.base[i].p2.y = _cairo_fixed_round_down (y2);
}
}
return TRUE;
}
static cairo_status_t
_cairo_filler_ra_line_to (void *closure,
const cairo_point_t *point)
{
cairo_filler_ra_t *filler = closure;
cairo_status_t status;
cairo_point_t p;
p.x = _cairo_fixed_round_down (point->x);
p.y = _cairo_fixed_round_down (point->y);
status = _cairo_polygon_add_external_edge (filler->polygon,
&filler->current_point,
&p);
filler->current_point = p;
return status;
}
static cairo_status_t
_cairo_filler_ra_move_to (void *closure,
const cairo_point_t *point)
{
cairo_filler_ra_t *filler = closure;
cairo_status_t status;
cairo_point_t p;
/* close current subpath */
status = _cairo_filler_ra_close (closure);
if (unlikely (status))
return status;
p.x = _cairo_fixed_round_down (point->x);
p.y = _cairo_fixed_round_down (point->y);
/* make sure that the closure represents a degenerate path */
filler->current_point = p;
filler->last_move_to = p;
return CAIRO_STATUS_SUCCESS;
}
cairo_status_t
_cairo_boxes_add (cairo_boxes_t *boxes,
cairo_antialias_t antialias,
const cairo_box_t *box)
{
cairo_box_t b;
if (antialias == CAIRO_ANTIALIAS_NONE) {
b.p1.x = _cairo_fixed_round_down (box->p1.x);
b.p1.y = _cairo_fixed_round_down (box->p1.y);
b.p2.x = _cairo_fixed_round_down (box->p2.x);
b.p2.y = _cairo_fixed_round_down (box->p2.y);
box = &b;
}
if (box->p1.y == box->p2.y)
return CAIRO_STATUS_SUCCESS;
if (box->p1.x == box->p2.x)
return CAIRO_STATUS_SUCCESS;
if (boxes->num_limits) {
cairo_point_t p1, p2;
cairo_bool_t reversed = FALSE;
int n;
/* support counter-clockwise winding for rectangular tessellation */
if (box->p1.x < box->p2.x) {
p1.x = box->p1.x;
p2.x = box->p2.x;
} else {
p2.x = box->p1.x;
p1.x = box->p2.x;
reversed = ! reversed;
}
if (p1.x >= boxes->limit.p2.x || p2.x <= boxes->limit.p1.x)
return CAIRO_STATUS_SUCCESS;
if (box->p1.y < box->p2.y) {
p1.y = box->p1.y;
p2.y = box->p2.y;
} else {
p2.y = box->p1.y;
p1.y = box->p2.y;
reversed = ! reversed;
}
if (p1.y >= boxes->limit.p2.y || p2.y <= boxes->limit.p1.y)
return CAIRO_STATUS_SUCCESS;
for (n = 0; n < boxes->num_limits; n++) {
const cairo_box_t *limits = &boxes->limits[n];
cairo_box_t _box;
cairo_point_t _p1, _p2;
if (p1.x >= limits->p2.x || p2.x <= limits->p1.x)
continue;
if (p1.y >= limits->p2.y || p2.y <= limits->p1.y)
continue;
/* Otherwise, clip the box to the limits. */
_p1 = p1;
if (_p1.x < limits->p1.x)
_p1.x = limits->p1.x;
if (_p1.y < limits->p1.y)
_p1.y = limits->p1.y;
_p2 = p2;
if (_p2.x > limits->p2.x)
_p2.x = limits->p2.x;
if (_p2.y > limits->p2.y)
_p2.y = limits->p2.y;
if (_p2.y <= _p1.y || _p2.x <= _p1.x)
continue;
_box.p1.y = _p1.y;
_box.p2.y = _p2.y;
if (reversed) {
_box.p1.x = _p2.x;
_box.p2.x = _p1.x;
} else {
_box.p1.x = _p1.x;
_box.p2.x = _p2.x;
}
_cairo_boxes_add_internal (boxes, &_box);
}
} else {
_cairo_boxes_add_internal (boxes, box);
}
return boxes->status;
}
