Replace Ratio<u16> with Ratio<i32>

As per rust-num/num#76, Ratio no longer
accepts unsigned types.

Signed-off-by: Anders Kaseorg <[email protected]>

Author: andersk

src/animation.rs

@@ -22,7 +22,7 @@ impl Frames {
 #[derive(Clone)]
 pub struct Frame {
     /// Delay between the frames in s
-    delay: Ratio<u16>,
+    delay: Ratio<i32>,
     /// x offset
     left: u32,
     /// y offset
@@ -42,7 +42,7 @@ impl Frame {
     }
 
     /// Contructs a new frame
-    pub fn from_parts(buffer: RgbaImage, left: u32, top: u32, delay: Ratio<u16>) -> Frame {
+    pub fn from_parts(buffer: RgbaImage, left: u32, top: u32, delay: Ratio<i32>) -> Frame {
         Frame {
             delay: delay,
             left: left,
@@ -52,7 +52,7 @@ impl Frame {
     }
 
     /// Delay of this frame
-    pub fn delay(&self) -> Ratio<u16> {
+    pub fn delay(&self) -> Ratio<i32> {
         self.delay
     }
 

src/gif/decoder.rs

@@ -238,7 +238,7 @@ impl<R: Read> GIFDecoder<R> {
                 image,
                 image_left as u32,
                 image_top as u32,
-                Ratio::new(self.delay, 100)
+                Ratio::new(self.delay as i32, 100)
             ))
         } else {
             Err(ImageError::FormatError(