[librsvg: 1/3] Extract non-API logic from get_geometry_for_layer

[Federico Mena Quintero <federico src gnome org>]

commit 41a9165765c11979426cffeb7edf30d3b1fd76af
Author: Federico Mena Quintero <federico gnome org>
Date:   Fri Oct 9 14:08:39 2020 -0500

    Extract non-API logic from get_geometry_for_layer

 rsvg_internals/src/handle.rs | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)
---
diff --git a/rsvg_internals/src/handle.rs b/rsvg_internals/src/handle.rs
index 901e5bd9..9a6f78e8 100644
--- a/rsvg_internals/src/handle.rs
+++ b/rsvg_internals/src/handle.rs
@@ -155,18 +155,15 @@ impl Handle {
         }
     }
 
-    pub fn get_geometry_for_layer(
+    fn geometry_for_layer(
         &self,
-        id: Option<&str>,
-        viewport: &cairo::Rectangle,
+        node: Node,
+        viewport: Rect,
         dpi: Dpi,
         is_testing: bool,
-    ) -> Result<(cairo::Rectangle, cairo::Rectangle), RenderingError> {
-        let node = self.get_node_or_root(id)?;
+    ) -> Result<(Rect, Rect), RenderingError> {
         let root = self.document.root();
 
-        let viewport = Rect::from(*viewport);
-
         let target = cairo::ImageSurface::create(cairo::Format::Rgb24, 1, 1)?;
         let cr = cairo::Context::new(&target);
 
@@ -183,6 +180,21 @@ impl Handle {
         let ink_rect = bbox.ink_rect.unwrap_or_default();
         let logical_rect = bbox.rect.unwrap_or_default();
 
+        Ok((ink_rect, logical_rect))
+    }
+
+    pub fn get_geometry_for_layer(
+        &self,
+        id: Option<&str>,
+        viewport: &cairo::Rectangle,
+        dpi: Dpi,
+        is_testing: bool,
+    ) -> Result<(cairo::Rectangle, cairo::Rectangle), RenderingError> {
+        let viewport = Rect::from(*viewport);
+        let node = self.get_node_or_root(id)?;
+
+        let (ink_rect, logical_rect) = self.geometry_for_layer(node, viewport, dpi, is_testing)?;
+
         Ok((
             cairo::Rectangle::from(ink_rect),
             cairo::Rectangle::from(logical_rect),