[librsvg/wip/dimensions-api: 9/11] RsvgUnit/RsvgLength - New public types

[Federico Mena Quintero <federico src gnome org>]

commit 9c4fb9dcf6b2a8dd44a39b3bac54eaa2e3c185cb
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Feb 7 16:44:38 2019 -0600

    RsvgUnit/RsvgLength - New public types
    
    We will return these from an API to get an SVG's intrinsic dimensions.

 librsvg/rsvg.h               | 17 +++++++++++++++++
 rsvg_internals/src/length.rs |  5 +++++
 2 files changed, 22 insertions(+)
---
diff --git a/librsvg/rsvg.h b/librsvg/rsvg.h
index cfb694a1..4232569d 100644
--- a/librsvg/rsvg.h
+++ b/librsvg/rsvg.h
@@ -204,6 +204,23 @@ gboolean rsvg_handle_get_geometry_sub (RsvgHandle    *handle,
 
 gboolean rsvg_handle_has_sub (RsvgHandle *handle, const char *id);
 
+typedef enum {
+    RSVG_UNIT_PERCENT,
+    RSVG_UNIT_PX,
+    RSVG_UNIT_EM,
+    RSVG_UNIT_EX,
+    RSVG_UNIT_IN,
+    RSVG_UNIT_CM,
+    RSVG_UNIT_MM,
+    RSVG_UNIT_PT,
+    RSVG_UNIT_PC
+} RsvgUnit;
+
+typedef struct {
+    double   length;
+    RsvgUnit unit;
+} RsvgLength;
+
 /* GIO APIs */
 
 /**
diff --git a/rsvg_internals/src/length.rs b/rsvg_internals/src/length.rs
index 78d75a40..e41f4189 100644
--- a/rsvg_internals/src/length.rs
+++ b/rsvg_internals/src/length.rs
@@ -7,7 +7,10 @@ use parsers::Parse;
 use parsers::ParseError;
 use properties::ComputedValues;
 
+// Keep this in sync with rsvg.h:RsvgUnit
+
 /// Units for length values
+#[repr(C)]
 #[derive(Debug, PartialEq, Copy, Clone)]
 pub enum LengthUnit {
     /// `1.0` means 100%
@@ -173,6 +176,8 @@ define_length_type!(LengthVertical, LengthDir::Vertical);
 /// against the current viewport's width and height.
 define_length_type!(LengthBoth, LengthDir::Both);
 
+// Keep this in sync with rsvg.h:RsvgLength
+#[repr(C)]
 #[derive(Debug, PartialEq, Copy, Clone)]
 struct Length {
     pub length: f64,