static cairo_int_status_t clip_and_composite_boxes (const cairo_spans_compositor_t *compositor, cairo_composite_rectangles_t *extents, cairo_boxes_t *boxes) { cairo_int_status_t status; cairo_polygon_t polygon; TRACE ((stderr, "%s\n", __FUNCTION__)); status = trim_extents_to_boxes (extents, boxes); if (unlikely (status)) return status; if (boxes->num_boxes == 0) { if (extents->is_bounded) return CAIRO_STATUS_SUCCESS; return fixup_unbounded_boxes (compositor, extents, boxes); } /* Can we reduce drawing through a clip-mask to simply drawing the clip? */ if (extents->clip->path != NULL && extents->is_bounded) { cairo_polygon_t polygon; cairo_fill_rule_t fill_rule; cairo_antialias_t antialias; cairo_clip_t *clip; clip = _cairo_clip_copy (extents->clip); clip = _cairo_clip_intersect_boxes (clip, boxes); if (_cairo_clip_is_all_clipped (clip)) return CAIRO_INT_STATUS_NOTHING_TO_DO; status = _cairo_clip_get_polygon (clip, &polygon, &fill_rule, &antialias); _cairo_clip_path_destroy (clip->path); clip->path = NULL; if (likely (status == CAIRO_INT_STATUS_SUCCESS)) { cairo_clip_t *saved_clip = extents->clip; extents->clip = clip; status = clip_and_composite_polygon (compositor, extents, &polygon, fill_rule, antialias); clip = extents->clip; extents->clip = saved_clip; _cairo_polygon_fini (&polygon); } _cairo_clip_destroy (clip); if (status != CAIRO_INT_STATUS_UNSUPPORTED) return status; } if (boxes->is_pixel_aligned) { status = composite_aligned_boxes (compositor, extents, boxes); if (status != CAIRO_INT_STATUS_UNSUPPORTED) return status; } status = composite_boxes (compositor, extents, boxes); if (status != CAIRO_INT_STATUS_UNSUPPORTED) return status; status = _cairo_polygon_init_boxes (&polygon, boxes); if (unlikely (status)) return status; status = composite_polygon (compositor, extents, &polygon, CAIRO_FILL_RULE_WINDING, CAIRO_ANTIALIAS_DEFAULT); _cairo_polygon_fini (&polygon); return status; }
static cairo_status_t _cairo_clip_intersect_path (cairo_clip_t *clip, const cairo_path_fixed_t *path, cairo_fill_rule_t fill_rule, double tolerance, cairo_antialias_t antialias) { cairo_clip_path_t *clip_path; cairo_status_t status; cairo_rectangle_int_t extents; cairo_box_t box; cairo_bool_t is_box = FALSE; if (clip->path != NULL) { if (clip->path->fill_rule == fill_rule && (path->is_rectilinear || (tolerance == clip->path->tolerance && antialias == clip->path->antialias)) && _cairo_path_fixed_equal (&clip->path->path, path)) { return CAIRO_STATUS_SUCCESS; } } _cairo_path_fixed_approximate_clip_extents (path, &extents); if (extents.width == 0 || extents.height == 0) { _cairo_clip_set_all_clipped (clip); return CAIRO_STATUS_SUCCESS; } is_box = _cairo_path_fixed_is_box (path, &box); if (clip->path != NULL) { if (! _cairo_rectangle_intersect (&extents, &clip->path->extents)) { _cairo_clip_set_all_clipped (clip); return CAIRO_STATUS_SUCCESS; } /* does this clip wholly subsume the others? */ if (is_box && box.p1.x <= _cairo_fixed_from_int (clip->path->extents.x) && box.p2.x >= _cairo_fixed_from_int (clip->path->extents.x + clip->path->extents.width) && box.p1.y <= _cairo_fixed_from_int (clip->path->extents.y) && box.p2.y >= _cairo_fixed_from_int (clip->path->extents.y + clip->path->extents.height)) { return CAIRO_STATUS_SUCCESS; } } clip_path = _cairo_clip_path_create (clip); if (unlikely (clip_path == NULL)) return _cairo_error (CAIRO_STATUS_NO_MEMORY); status = _cairo_path_fixed_init_copy (&clip_path->path, path); if (unlikely (status)) { clip->path = clip->path->prev; _cairo_clip_path_destroy (clip_path); return status; } clip_path->extents = extents; clip_path->fill_rule = fill_rule; clip_path->tolerance = tolerance; clip_path->antialias = antialias; if (is_box) clip_path->flags |= CAIRO_CLIP_PATH_IS_BOX; return CAIRO_STATUS_SUCCESS; }