[librsvg: 2/15] Use the primitive_units from the FilterContext; no need to get them from a parent node

[Federico Mena Quintero <federico src gnome org>]

commit 5bf020ea801cc5c9fd39b8f8042481a20b53b681
Author: John Ledbetter <john ledbetter gmail com>
Date:   Mon Mar 8 13:32:16 2021 -0600

    Use the primitive_units from the FilterContext; no need to get them from a parent node
    
    The primitiveUnits from the <filter> node have already been copied to
    the FilterContext when it was built.  We don't need
    Primitive.get_bounds() to go looking up the tree of elements.

 src/filters/mod.rs | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)
---
diff --git a/src/filters/mod.rs b/src/filters/mod.rs
index 7f3d9017..0419197d 100644
--- a/src/filters/mod.rs
+++ b/src/filters/mod.rs
@@ -141,18 +141,8 @@ impl Primitive {
         ctx: &'a FilterContext,
         parent: Option<&Node>,
     ) -> Result<BoundsBuilder, FilterError> {
-        let primitive_units = parent
-            .and_then(|parent| {
-                assert!(parent.is_element());
-                match *parent.borrow_element() {
-                    Element::Filter(ref f) => Some(f.get_primitive_units()),
-                    _ => None,
-                }
-            })
-            .unwrap_or(CoordUnits::UserSpaceOnUse);
-
         // With ObjectBoundingBox, only fractions and percents are allowed.
-        if primitive_units == CoordUnits::ObjectBoundingBox {
+        if ctx.primitive_units() == CoordUnits::ObjectBoundingBox {
             check_units(self.x)?;
             check_units(self.y)?;
             check_units(self.width)?;