Implement Error for TextureValueError

src/sdl2/render.rs

@@ -35,6 +35,7 @@ use pixels;
 use pixels::PixelFormatEnum;
 use get_error;
 use std::fmt;
+use std::error::Error;
 use std::mem;
 use std::ptr;
 use libc::{c_int, uint32_t, c_double, c_void};
@@ -356,6 +357,19 @@ impl fmt::Display for TextureValueError {
     }
 }
 
+impl Error for TextureValueError {
+    fn description(&self) -> &str {
+        use self::TextureValueError::*;
+
+        match *self {
+            WidthOverflows(_) => "texture width overflow",
+            HeightOverflows(_) => "texture height overflow",
+            WidthMustBeMultipleOfTwoForFormat(..) => "texture width must be multiple of two",
+            SdlError(ref e) => e,
+        }
+    }
+}
+
 /// Texture-creating methods for the renderer
 impl<'a> Renderer<'a> {
     /// Creates a texture for a rendering context.