[librsvg] cargo-clippy: Pass references to RsvgBbox, don't move the values

[Federico Mena Quintero <federico src gnome org>]

commit 7c6c55ce5cb5d116f2b214cc6ae71fc1b2fd529d
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Feb 22 13:20:08 2018 -0600

    cargo-clippy: Pass references to RsvgBbox, don't move the values

 rust/src/bbox.rs         | 1 +
 rust/src/gradient.rs     | 6 +++---
 rust/src/paint_server.rs | 4 ++--
 rust/src/pattern.rs      | 6 +++---
 4 files changed, 9 insertions(+), 8 deletions(-)
---
diff --git a/rust/src/bbox.rs b/rust/src/bbox.rs
index 907ac108..6fa5d4e9 100644
--- a/rust/src/bbox.rs
+++ b/rust/src/bbox.rs
@@ -7,6 +7,7 @@ use util::*;
 
 /* Keep this in sync with ../../rsvg-private.h:RsvgBbox */
 #[repr(C)]
+#[derive(Copy, Clone)]
 pub struct RsvgBbox {
     pub rect:   cairo::Rectangle,
     pub affine: cairo::Matrix,
diff --git a/rust/src/gradient.rs b/rust/src/gradient.rs
index 89856ac5..acaf1066 100644
--- a/rust/src/gradient.rs
+++ b/rust/src/gradient.rs
@@ -684,7 +684,7 @@ pub extern fn rsvg_node_radial_gradient_new (_: *const libc::c_char, raw_parent:
 fn resolve_fallbacks_and_set_pattern (gradient: &Gradient,
                                       draw_ctx: *mut RsvgDrawingCtx,
                                       opacity:  u8,
-                                      bbox:     RsvgBbox) -> bool {
+                                      bbox:     &RsvgBbox) -> bool {
     let mut fallback_source = NodeFallbackSource::new (draw_ctx);
 
     if bbox.is_empty() {
@@ -699,14 +699,14 @@ fn resolve_fallbacks_and_set_pattern (gradient: &Gradient,
 pub fn gradient_resolve_fallbacks_and_set_pattern (node:     &RsvgNode,
                                                    draw_ctx: *mut RsvgDrawingCtx,
                                                    opacity:  u8,
-                                                   bbox:     RsvgBbox) -> bool {
+                                                   bbox:     &RsvgBbox) -> bool {
     assert! (node.get_type () == NodeType::LinearGradient || node.get_type () == NodeType::RadialGradient);
 
     let mut did_set_gradient = false;
 
     node.with_impl (|node_gradient: &NodeGradient| {
         let gradient = node_gradient.get_gradient_with_color_stops_from_node (node);
-        did_set_gradient = resolve_fallbacks_and_set_pattern (&gradient, draw_ctx, opacity, bbox);
+        did_set_gradient = resolve_fallbacks_and_set_pattern (&gradient, draw_ctx, opacity, &bbox);
     });
 
     did_set_gradient
diff --git a/rust/src/paint_server.rs b/rust/src/paint_server.rs
index 2c2f2441..aa35b00a 100644
--- a/rust/src/paint_server.rs
+++ b/rust/src/paint_server.rs
@@ -233,10 +233,10 @@ pub extern "C" fn _set_source_rsvg_paint_server(
                         node,
                         c_ctx,
                         opacity,
-                        c_bbox,
+                        &c_bbox,
                     );
                 } else if node.get_type() == NodeType::Pattern {
-                    had_paint_server = pattern::pattern_resolve_fallbacks_and_set_pattern(node, c_ctx, 
c_bbox);
+                    had_paint_server = pattern::pattern_resolve_fallbacks_and_set_pattern(node, c_ctx, 
&c_bbox);
                 }
             }
 
diff --git a/rust/src/pattern.rs b/rust/src/pattern.rs
index dbe800bc..57621010 100644
--- a/rust/src/pattern.rs
+++ b/rust/src/pattern.rs
@@ -464,12 +464,12 @@ fn set_pattern_on_draw_context (pattern: &Pattern,
 
 fn resolve_fallbacks_and_set_pattern (pattern:  &Pattern,
                                       draw_ctx: *mut RsvgDrawingCtx,
-                                      bbox:     RsvgBbox) -> bool {
+                                      bbox:     &RsvgBbox) -> bool {
     let mut fallback_source = NodeFallbackSource::new (draw_ctx);
 
     let resolved = resolve_pattern (pattern, &mut fallback_source);
 
-    set_pattern_on_draw_context (&resolved, draw_ctx, &bbox)
+    set_pattern_on_draw_context (&resolved, draw_ctx, bbox)
 }
 
 #[no_mangle]
@@ -481,7 +481,7 @@ pub extern fn rsvg_node_pattern_new (_: *const libc::c_char, raw_parent: *const
 
 pub fn pattern_resolve_fallbacks_and_set_pattern (node: &RsvgNode,
                                                   draw_ctx: *mut RsvgDrawingCtx,
-                                                  bbox:     RsvgBbox) -> bool {
+                                                  bbox: &RsvgBbox) -> bool {
     assert! (node.get_type () == NodeType::Pattern);
 
     let mut did_set_pattern = false;