static cairo_int_status_t
clip_and_composite_polygon (const cairo_spans_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
cairo_polygon_t *polygon,
cairo_fill_rule_t fill_rule,
cairo_antialias_t antialias)
{
cairo_int_status_t status;
/* XXX simply uses polygon limits.point extemities, tessellation? */
status = trim_extents_to_polygon (extents, polygon);
if (unlikely (status))
return status;
if (_cairo_polygon_is_empty (polygon)) {
cairo_boxes_t boxes;
if (extents->is_bounded)
return CAIRO_STATUS_SUCCESS;
_cairo_boxes_init (&boxes);
extents->bounded.width = extents->bounded.height = 0;
return fixup_unbounded_boxes (compositor, extents, &boxes);
}
if (extents->is_bounded && extents->clip->path) {
cairo_polygon_t clipper;
cairo_antialias_t clip_antialias;
cairo_fill_rule_t clip_fill_rule;
status = _cairo_clip_get_polygon (extents->clip,
&clipper,
&clip_fill_rule,
&clip_antialias);
if (likely (status == CAIRO_INT_STATUS_SUCCESS)) {
cairo_clip_t *old_clip;
if (clip_antialias == antialias) {
/* refresh limits after trimming extents */
_cairo_polygon_limit_to_clip(polygon, extents->clip);
status = _cairo_polygon_intersect (polygon, fill_rule,
&clipper, clip_fill_rule);
_cairo_polygon_fini (&clipper);
if (unlikely (status))
return status;
old_clip = extents->clip;
extents->clip = _cairo_clip_copy_region (extents->clip);
_cairo_clip_destroy (old_clip);
} else {
_cairo_polygon_fini (&clipper);
}
}
}
return composite_polygon (compositor, extents,
polygon, fill_rule, antialias);
}
cairo_status_t
_cairo_polygon_intersect_with_boxes (cairo_polygon_t *polygon,
cairo_fill_rule_t *winding,
cairo_box_t *boxes,
int num_boxes)
{
cairo_polygon_t b;
cairo_status_t status;
int n;
if (num_boxes == 0) {
polygon->num_edges = 0;
return CAIRO_STATUS_SUCCESS;
}
for (n = 0; n < num_boxes; n++) {
if (polygon->extents.p1.x >= boxes[n].p1.x &&
polygon->extents.p2.x <= boxes[n].p2.x &&
polygon->extents.p1.y >= boxes[n].p1.y &&
polygon->extents.p2.y <= boxes[n].p2.y)
{
return CAIRO_STATUS_SUCCESS;
}
}
_cairo_polygon_init (&b, NULL, 0);
for (n = 0; n < num_boxes; n++) {
if (boxes[n].p2.x > polygon->extents.p1.x &&
boxes[n].p1.x < polygon->extents.p2.x &&
boxes[n].p2.y > polygon->extents.p1.y &&
boxes[n].p1.y < polygon->extents.p2.y)
{
cairo_point_t p1, p2;
p1.y = boxes[n].p1.y;
p2.y = boxes[n].p2.y;
p2.x = p1.x = boxes[n].p1.x;
_cairo_polygon_add_external_edge (&b, &p1, &p2);
p2.x = p1.x = boxes[n].p2.x;
_cairo_polygon_add_external_edge (&b, &p2, &p1);
}
}
status = _cairo_polygon_intersect (polygon, *winding,
&b, CAIRO_FILL_RULE_WINDING);
_cairo_polygon_fini (&b);
*winding = CAIRO_FILL_RULE_WINDING;
return status;
}
static cairo_int_status_t
fixup_unbounded_polygon (const cairo_spans_compositor_t *compositor,
const cairo_composite_rectangles_t *extents,
cairo_boxes_t *boxes)
{
cairo_polygon_t polygon, intersect;
cairo_composite_rectangles_t composite;
cairo_fill_rule_t fill_rule;
cairo_antialias_t antialias;
cairo_int_status_t status;
TRACE((stderr, "%s\n", __FUNCTION__));
/* Can we treat the clip as a regular clear-polygon and use it to fill? */
status = _cairo_clip_get_polygon (extents->clip, &polygon,
&fill_rule, &antialias);
if (status == CAIRO_INT_STATUS_UNSUPPORTED)
return status;
status= _cairo_polygon_init_boxes (&intersect, boxes);
if (unlikely (status))
goto cleanup_polygon;
status = _cairo_polygon_intersect (&polygon, fill_rule,
&intersect, CAIRO_FILL_RULE_WINDING);
_cairo_polygon_fini (&intersect);
if (unlikely (status))
goto cleanup_polygon;
status = _cairo_composite_rectangles_init_for_polygon (&composite,
extents->surface,
CAIRO_OPERATOR_CLEAR,
&_cairo_pattern_clear.base,
&polygon,
NULL);
if (unlikely (status))
goto cleanup_polygon;
status = composite_polygon (compositor, &composite,
&polygon, fill_rule, antialias);
_cairo_composite_rectangles_fini (&composite);
cleanup_polygon:
_cairo_polygon_fini (&polygon);
return status;
}
cairo_int_status_t
_cairo_clip_get_polygon (const cairo_clip_t *clip,
cairo_polygon_t *polygon,
cairo_fill_rule_t *fill_rule,
cairo_antialias_t *antialias)
{
cairo_status_t status;
cairo_clip_path_t *clip_path;
if (_cairo_clip_is_all_clipped (clip)) {
_cairo_polygon_init (polygon, NULL, 0);
return CAIRO_INT_STATUS_SUCCESS;
}
/* If there is no clip, we need an infinite polygon */
assert (clip && (clip->path || clip->num_boxes));
if (clip->path == NULL) {
*fill_rule = CAIRO_FILL_RULE_WINDING;
*antialias = CAIRO_ANTIALIAS_DEFAULT;
return _cairo_polygon_init_box_array (polygon,
clip->boxes,
clip->num_boxes);
}
/* check that residual is all of the same type/tolerance */
if (! can_convert_to_polygon (clip))
return CAIRO_INT_STATUS_UNSUPPORTED;
if (clip->num_boxes < 2)
_cairo_polygon_init_with_clip (polygon, clip);
else
_cairo_polygon_init_with_clip (polygon, NULL);
clip_path = clip->path;
*fill_rule = clip_path->fill_rule;
*antialias = clip_path->antialias;
status = _cairo_path_fixed_fill_to_polygon (&clip_path->path,
clip_path->tolerance,
polygon);
if (unlikely (status))
goto err;
if (clip->num_boxes > 1) {
status = _cairo_polygon_intersect_with_boxes (polygon, fill_rule,
clip->boxes, clip->num_boxes);
if (unlikely (status))
goto err;
}
polygon->limits = NULL;
polygon->num_limits = 0;
while ((clip_path = clip_path->prev) != NULL) {
cairo_polygon_t next;
_cairo_polygon_init (&next, NULL, 0);
status = _cairo_path_fixed_fill_to_polygon (&clip_path->path,
clip_path->tolerance,
&next);
if (likely (status == CAIRO_STATUS_SUCCESS))
status = _cairo_polygon_intersect (polygon, *fill_rule,
&next, clip_path->fill_rule);
_cairo_polygon_fini (&next);
if (unlikely (status))
goto err;
*fill_rule = CAIRO_FILL_RULE_WINDING;
}
return CAIRO_STATUS_SUCCESS;
err:
_cairo_polygon_fini (polygon);
return status;
}
static cairo_surface_t *
get_clip_surface (const cairo_spans_compositor_t *compositor,
cairo_surface_t *dst,
const cairo_clip_t *clip,
const cairo_rectangle_int_t *extents)
{
cairo_composite_rectangles_t composite;
cairo_surface_t *surface;
cairo_box_t box;
cairo_polygon_t polygon;
const cairo_clip_path_t *clip_path;
cairo_antialias_t antialias;
cairo_fill_rule_t fill_rule;
cairo_int_status_t status;
assert (clip->path);
surface = _cairo_surface_create_similar_solid (dst,
CAIRO_CONTENT_ALPHA,
extents->width,
extents->height,
CAIRO_COLOR_TRANSPARENT);
_cairo_box_from_rectangle (&box, extents);
_cairo_polygon_init (&polygon, &box, 1);
clip_path = clip->path;
status = _cairo_path_fixed_fill_to_polygon (&clip_path->path,
clip_path->tolerance,
&polygon);
if (unlikely (status))
goto cleanup_polygon;
antialias = clip_path->antialias;
fill_rule = clip_path->fill_rule;
if (clip->boxes) {
cairo_polygon_t intersect;
cairo_boxes_t tmp;
_cairo_boxes_init_for_array (&tmp, clip->boxes, clip->num_boxes);
status= _cairo_polygon_init_boxes (&intersect, &tmp);
if (unlikely (status))
goto cleanup_polygon;
status = _cairo_polygon_intersect (&polygon, fill_rule,
&intersect, CAIRO_FILL_RULE_WINDING);
_cairo_polygon_fini (&intersect);
if (unlikely (status))
goto cleanup_polygon;
fill_rule = CAIRO_FILL_RULE_WINDING;
}
polygon.limits = NULL;
polygon.num_limits = 0;
clip_path = clip_path->prev;
while (clip_path) {
if (clip_path->antialias == antialias) {
cairo_polygon_t next;
_cairo_polygon_init (&next, NULL, 0);
status = _cairo_path_fixed_fill_to_polygon (&clip_path->path,
clip_path->tolerance,
&next);
if (likely (status == CAIRO_INT_STATUS_SUCCESS))
status = _cairo_polygon_intersect (&polygon, fill_rule,
&next, clip_path->fill_rule);
_cairo_polygon_fini (&next);
if (unlikely (status))
goto cleanup_polygon;
fill_rule = CAIRO_FILL_RULE_WINDING;
}
clip_path = clip_path->prev;
}
_cairo_polygon_translate (&polygon, -extents->x, -extents->y);
status = _cairo_composite_rectangles_init_for_polygon (&composite, surface,
CAIRO_OPERATOR_ADD,
&_cairo_pattern_white.base,
&polygon,
NULL);
if (unlikely (status))
goto cleanup_polygon;
status = composite_polygon (compositor, &composite,
&polygon, fill_rule, antialias);
_cairo_composite_rectangles_fini (&composite);
_cairo_polygon_fini (&polygon);
if (unlikely (status))
goto error;
_cairo_polygon_init (&polygon, &box, 1);
clip_path = clip->path;
antialias = clip_path->antialias == CAIRO_ANTIALIAS_DEFAULT ? CAIRO_ANTIALIAS_NONE : CAIRO_ANTIALIAS_DEFAULT;
clip_path = clip_path->prev;
while (clip_path) {
if (clip_path->antialias == antialias) {
if (polygon.num_edges == 0) {
status = _cairo_path_fixed_fill_to_polygon (&clip_path->path,
clip_path->tolerance,
&polygon);
fill_rule = clip_path->fill_rule;
polygon.limits = NULL;
polygon.num_limits = 0;
} else {
cairo_polygon_t next;
_cairo_polygon_init (&next, NULL, 0);
status = _cairo_path_fixed_fill_to_polygon (&clip_path->path,
clip_path->tolerance,
&next);
if (likely (status == CAIRO_INT_STATUS_SUCCESS))
status = _cairo_polygon_intersect (&polygon, fill_rule,
&next, clip_path->fill_rule);
_cairo_polygon_fini (&next);
fill_rule = CAIRO_FILL_RULE_WINDING;
}
if (unlikely (status))
goto error;
}
clip_path = clip_path->prev;
}
if (polygon.num_edges) {
_cairo_polygon_translate (&polygon, -extents->x, -extents->y);
status = _cairo_composite_rectangles_init_for_polygon (&composite, surface,
CAIRO_OPERATOR_IN,
&_cairo_pattern_white.base,
&polygon,
NULL);
if (unlikely (status))
goto cleanup_polygon;
status = composite_polygon (compositor, &composite,
&polygon, fill_rule, antialias);
_cairo_composite_rectangles_fini (&composite);
_cairo_polygon_fini (&polygon);
if (unlikely (status))
goto error;
}
return surface;
cleanup_polygon:
_cairo_polygon_fini (&polygon);
error:
cairo_surface_destroy (surface);
return _cairo_int_surface_create_in_error (status);
}
static cairo_int_status_t
clip_and_composite_polygon (const cairo_spans_compositor_t *compositor,
cairo_composite_rectangles_t *extents,
cairo_polygon_t *polygon,
cairo_fill_rule_t fill_rule,
cairo_antialias_t antialias)
{
cairo_int_status_t status;
TRACE ((stderr, "%s\n", __FUNCTION__));
/* XXX simply uses polygon limits.point extemities, tessellation? */
status = trim_extents_to_polygon (extents, polygon);
if (unlikely (status))
return status;
if (_cairo_polygon_is_empty (polygon)) {
cairo_boxes_t boxes;
if (extents->is_bounded)
return CAIRO_STATUS_SUCCESS;
_cairo_boxes_init (&boxes);
extents->bounded.width = extents->bounded.height = 0;
return fixup_unbounded_boxes (compositor, extents, &boxes);
}
if (extents->is_bounded && extents->clip->path) {
cairo_polygon_t clipper;
cairo_antialias_t clip_antialias;
cairo_fill_rule_t clip_fill_rule;
TRACE((stderr, "%s - combining shape with clip polygon\n",
__FUNCTION__));
status = _cairo_clip_get_polygon (extents->clip,
&clipper,
&clip_fill_rule,
&clip_antialias);
if (likely (status == CAIRO_INT_STATUS_SUCCESS)) {
cairo_clip_t *old_clip;
if (clip_antialias == antialias) {
status = _cairo_polygon_intersect (polygon, fill_rule,
&clipper, clip_fill_rule);
_cairo_polygon_fini (&clipper);
if (unlikely (status))
return status;
old_clip = extents->clip;
extents->clip = _cairo_clip_copy_region (extents->clip);
_cairo_clip_destroy (old_clip);
status = trim_extents_to_polygon (extents, polygon);
if (unlikely (status))
return status;
fill_rule = CAIRO_FILL_RULE_WINDING;
} else {
_cairo_polygon_fini (&clipper);
}
}
}
return composite_polygon (compositor, extents,
polygon, fill_rule, antialias);
}