[librsvg] drawing_ctx::state_get_current_color() - Promote the u32 result to a full Color value

[Federico Mena Quintero <federico src gnome org>]

commit eafedf3c202e754fa4514e85c17d58497ba6796e
Author: Federico Mena Quintero <federico gnome org>
Date:   Wed May 31 16:22:42 2017 -0500

    drawing_ctx::state_get_current_color() - Promote the u32 result to a full Color value
    
    Although we don't support "inherit" as a value for the "color"
    property (i.e. what is used to specify currentColor), we'll support it
    later --- this is embodied in the Color structure.

 rust/src/color.rs       |   12 ++++++++++++
 rust/src/drawing_ctx.rs |    8 ++++----
 2 files changed, 16 insertions(+), 4 deletions(-)
---
diff --git a/rust/src/color.rs b/rust/src/color.rs
index 9a25005..61d6cca 100644
--- a/rust/src/color.rs
+++ b/rust/src/color.rs
@@ -115,6 +115,12 @@ impl From<cssparser::Color> for Color {
     }
 }
 
+impl From<u32> for Color {
+    fn from (argb: u32) -> Color {
+        Color::RGBA (rgba_from_argb (argb))
+    }
+}
+
 impl From<Result<Color, AttributeError>> for ColorSpec {
     fn from (result: Result<Color, AttributeError>) -> ColorSpec {
         match result {
@@ -246,4 +252,10 @@ mod tests {
         test_roundtrip ("#aabbccdd");
         test_roundtrip ("papadzul");
     }
+
+    #[test]
+    fn from_argb () {
+        assert_eq! (Color::from (0xaabbccdd),
+                    Color::RGBA (cssparser::RGBA::new (0xbb, 0xcc, 0xdd, 0xaa)));
+    }
 }
diff --git a/rust/src/drawing_ctx.rs b/rust/src/drawing_ctx.rs
index a332ca5..0e8e8ad 100644
--- a/rust/src/drawing_ctx.rs
+++ b/rust/src/drawing_ctx.rs
@@ -268,8 +268,8 @@ pub fn state_get_stop_opacity (state: *const RsvgState) -> Result<Option<Opacity
     }
 }
 
-pub fn state_get_current_color (state: *const RsvgState) -> u32 {
-    unsafe {
-        rsvg_state_get_current_color (state)
-    }
+pub fn state_get_current_color (state: *const RsvgState) -> Color {
+    let argb = unsafe { rsvg_state_get_current_color (state) };
+
+    Color::from (argb)
 }