Index: src/sp-item.cpp
===================================================================
--- src/sp-item.cpp	(Revision 22378)
+++ src/sp-item.cpp	(Arbeitskopie)
@@ -803,39 +803,57 @@
                 if (SP_FILTER(filter)->height._set)
                     h = SP_FILTER(filter)->height.computed;
 
-                double dx0 = 0;
-                double dx1 = 0;
-                double dy0 = 0;
-                double dy1 = 0;
-                if (filter_is_single_gaussian_blur(SP_FILTER(filter))) {
-                    // if this is a single blur, use 2.4*radius
-                    // which may be smaller than the default area;
-                    // see set_filter_area for why it's 2.4
-                    double r = get_single_gaussian_blur_radius (SP_FILTER(filter));
-                    dx0 = -2.4 * r;
-                    dx1 = 2.4 * r;
-                    dy0 = -2.4 * r;
-                    dy1 = 2.4 * r;
-                } else {
-                    // otherwise, calculate expansion from relative to absolute units:
-                    dx0 = x * (temp_bbox.x1 - temp_bbox.x0);
-                    dx1 = (w + x - 1) * (temp_bbox.x1 - temp_bbox.x0);
-                    dy0 = y * (temp_bbox.y1 - temp_bbox.y0);
-                    dy1 = (h + y - 1) * (temp_bbox.y1 - temp_bbox.y0);
-                }
+                if(SP_FILTER(filter)->filterUnits_set) {
+                    if(SP_FILTER(filter)->filterUnits == SP_FILTER_UNITS_OBJECTBOUNDINGBOX) {
+                        double dx0 = 0;
+                        double dx1 = 0;
+                        double dy0 = 0;
+                        double dy1 = 0;
+                        if (filter_is_single_gaussian_blur(SP_FILTER(filter))) {
+                            // if this is a single blur, use 2.4*radius
+                            // which may be smaller than the default area;
+                            // see set_filter_area for why it's 2.4
+                            double r = get_single_gaussian_blur_radius (SP_FILTER(filter));
+                            dx0 = -2.4 * r;
+                            dx1 = 2.4 * r;
+                            dy0 = -2.4 * r;
+                            dy1 = 2.4 * r;
+                        } else {
+                            // otherwise, calculate expansion from relative to absolute units:
+                            dx0 = x * (temp_bbox.x1 - temp_bbox.x0);
+                            dx1 = (w + x - 1) * (temp_bbox.x1 - temp_bbox.x0);
+                            dy0 = y * (temp_bbox.y1 - temp_bbox.y0);
+                            dy1 = (h + y - 1) * (temp_bbox.y1 - temp_bbox.y0);
+                        }
 
-                // transform the expansions by the item's transform:
-                Geom::Matrix i2d(sp_item_i2d_affine (item));
-                dx0 *= i2d.expansionX();
-                dx1 *= i2d.expansionX();
-                dy0 *= i2d.expansionY();
-                dy1 *= i2d.expansionY();
+                        // transform the expansions by the item's transform:
+                        Geom::Matrix i2d(sp_item_i2d_affine (item));
+                        dx0 *= i2d.expansionX();
+                        dx1 *= i2d.expansionX();
+                        dy0 *= i2d.expansionY();
+                        dy1 *= i2d.expansionY();
 
-                // expand the bbox
-                temp_bbox.x0 += dx0;
-                temp_bbox.x1 += dx1;
-                temp_bbox.y0 += dy0;
-                temp_bbox.y1 += dy1;
+                        // expand the bbox
+                        temp_bbox.x0 += dx0;
+                        temp_bbox.x1 += dx1;
+                        temp_bbox.y0 += dy0;
+                        temp_bbox.y1 += dy1;
+                    } else if(SP_FILTER(filter)->filterUnits == SP_FILTER_UNITS_USERSPACEONUSE) {
+                        double blur_margin = 0.0;
+                        if (filter_is_single_gaussian_blur(SP_FILTER(filter))) {
+                            blur_margin = 2.4 * get_single_gaussian_blur_radius (SP_FILTER(filter));
+                        }
+                        Geom::Rect filter_rect(Geom::Point(x - blur_margin, y - blur_margin), Geom::Point(x + w + blur_margin, y + h + blur_margin));
+                        filter_rect = filter_rect * transform;
+
+                        temp_bbox.x0 = filter_rect.min()[Geom::X];
+                        temp_bbox.y0 = filter_rect.min()[Geom::Y];
+                        temp_bbox.x1 = filter_rect.max()[Geom::X];
+                        temp_bbox.y1 = filter_rect.max()[Geom::Y];
+                    } else {
+                        g_warning("Error in Inkscape::Filters::FilterUnits::get_matrix_user2units: unrecognized unit type (%d)", SP_FILTER(filter)->filterUnits);
+                    }
+                }
             }
         }
         if (item->clip_ref->getObject()) {