/* Composites a region representing a set of trapezoids.
*/
static cairo_status_t
_composite_trap_region (cairo_clip_t *clip,
cairo_pattern_t *src,
cairo_operator_t op,
cairo_surface_t *dst,
cairo_region_t *trap_region,
cairo_rectangle_int_t *extents)
{
cairo_status_t status;
cairo_pattern_union_t solid_pattern;
cairo_pattern_union_t mask;
int num_rects = _cairo_region_num_boxes (trap_region);
unsigned int clip_serial;
cairo_surface_t *clip_surface = clip ? clip->surface : NULL;
if (clip_surface && op == CAIRO_OPERATOR_CLEAR) {
_cairo_pattern_init_solid (&solid_pattern.solid, CAIRO_COLOR_WHITE,
CAIRO_CONTENT_COLOR);
src = &solid_pattern.base;
op = CAIRO_OPERATOR_DEST_OUT;
}
if (num_rects == 0)
return CAIRO_STATUS_SUCCESS;
if (num_rects > 1) {
if (_cairo_surface_get_clip_mode (dst) != CAIRO_CLIP_MODE_REGION)
return CAIRO_INT_STATUS_UNSUPPORTED;
clip_serial = _cairo_surface_allocate_clip_serial (dst);
status = _cairo_surface_set_clip_region (dst,
trap_region,
clip_serial);
if (status)
return status;
}
if (clip_surface)
_cairo_pattern_init_for_surface (&mask.surface, clip_surface);
status = _cairo_surface_composite (op,
src,
clip_surface ? &mask.base : NULL,
dst,
extents->x, extents->y,
extents->x - (clip_surface ? clip->surface_rect.x : 0),
extents->y - (clip_surface ? clip->surface_rect.y : 0),
extents->x, extents->y,
extents->width, extents->height);
/* Restore the original clip if we modified it temporarily. */
if (num_rects > 1) {
cairo_status_t status2 = _cairo_surface_set_clip (dst, clip);
if (status == CAIRO_STATUS_SUCCESS)
status = status2;
}
if (clip_surface)
_cairo_pattern_fini (&mask.base);
if (src == &solid_pattern.base)
_cairo_pattern_fini (&solid_pattern.base);
return status;
}
cairo_rectangle_list_t *
_cairo_clip_copy_rectangle_list (cairo_clip_t *clip, cairo_gstate_t *gstate)
{
cairo_rectangle_list_t *list;
cairo_rectangle_t *rectangles = NULL;
int n_boxes = 0;
if (clip->all_clipped)
goto DONE;
if (clip->path || clip->surface) {
_cairo_error_throw (CAIRO_STATUS_CLIP_NOT_REPRESENTABLE);
return (cairo_rectangle_list_t*) &_cairo_rectangles_not_representable;
}
if (clip->has_region) {
int i;
n_boxes = _cairo_region_num_boxes (&clip->region);
if (n_boxes) {
rectangles = _cairo_malloc_ab (n_boxes, sizeof (cairo_rectangle_t));
if (unlikely (rectangles == NULL)) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
return (cairo_rectangle_list_t*) &_cairo_rectangles_nil;
}
for (i = 0; i < n_boxes; ++i) {
cairo_box_int_t box;
cairo_rectangle_int_t clip_rect;
_cairo_region_get_box (&clip->region, i, &box);
clip_rect.x = box.p1.x;
clip_rect.y = box.p1.y;
clip_rect.width = box.p2.x - box.p1.x;
clip_rect.height = box.p2.y - box.p1.y;
if (!_cairo_clip_int_rect_to_user(gstate, &clip_rect, &rectangles[i])) {
_cairo_error_throw (CAIRO_STATUS_CLIP_NOT_REPRESENTABLE);
free (rectangles);
return (cairo_rectangle_list_t*) &_cairo_rectangles_not_representable;
}
}
}
} else {
cairo_rectangle_int_t extents;
n_boxes = 1;
rectangles = malloc(sizeof (cairo_rectangle_t));
if (unlikely (rectangles == NULL)) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
return (cairo_rectangle_list_t*) &_cairo_rectangles_nil;
}
if (_cairo_surface_get_extents (_cairo_gstate_get_target (gstate), &extents) ||
!_cairo_clip_int_rect_to_user(gstate, &extents, rectangles))
{
_cairo_error_throw (CAIRO_STATUS_CLIP_NOT_REPRESENTABLE);
free (rectangles);
return (cairo_rectangle_list_t*) &_cairo_rectangles_not_representable;
}
}
DONE:
list = malloc (sizeof (cairo_rectangle_list_t));
if (unlikely (list == NULL)) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
free (rectangles);
return (cairo_rectangle_list_t*) &_cairo_rectangles_nil;
}
list->status = CAIRO_STATUS_SUCCESS;
list->rectangles = rectangles;
list->num_rectangles = n_boxes;
return list;
}
