[librsvg/rustify-rsvg-convert: 66/78] rsvg-convert: extract the final_size computation to a function

[Sven Neumann <sneumann src gnome org>]

commit 2f1659f24b0ca28451494dd6e7bb65dd301f2548
Author: Federico Mena Quintero <federico gnome org>
Date:   Mon Jan 25 15:52:35 2021 -0600

    rsvg-convert: extract the final_size computation to a function

 src/bin/rsvg-convert.rs | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)
---
diff --git a/src/bin/rsvg-convert.rs b/src/bin/rsvg-convert.rs
index fe9c8da5..ac1ec99a 100644
--- a/src/bin/rsvg-convert.rs
+++ b/src/bin/rsvg-convert.rs
@@ -412,6 +412,15 @@ impl Converter {
         Size::new(w, h)
     }
 
+    fn final_size(&self, strategy: &ResizeStrategy, natural_size: &Size, input: &Input) -> Size {
+        strategy
+            .apply(
+                Size::new(natural_size.w, natural_size.h),
+                self.keep_aspect_ratio,
+            )
+            .unwrap_or_else(|| exit!("The SVG {} has no dimensions", input))
+    }
+
     fn create_surface(&self, renderer: &CairoRenderer, input: &Input) -> Surface {
         let natural_size = self.natural_size(renderer, input);
 
@@ -431,12 +440,7 @@ impl Converter {
             _ => ResizeStrategy::FitLargestScale(self.zoom, self.width, self.height),
         };
 
-        let final_size = strategy
-            .apply(
-                Size::new(natural_size.w, natural_size.h),
-                self.keep_aspect_ratio,
-            )
-            .unwrap_or_else(|| exit!("The SVG {} has no dimensions", input));
+        let final_size = self.final_size(&strategy, &natural_size, input);
 
         let output_stream = match self.output {
             Output::Stdout => Stdout::stream().upcast::<OutputStream>(),