Add new_with_limits

src/decoder/mod.rs

@@ -79,10 +79,14 @@ pub struct Decoder<R: Read> {
 
 impl<R: Read> Decoder<R> {
     pub fn new(r: R) -> Decoder<R> {
+        Decoder::new_with_limits(r, Limits::default())
+    }
+
+    pub fn new_with_limits(r: R, l: Limits) -> Decoder<R> {
         Decoder {
             r: r,
             transform: ::Transformations::EXPAND | ::Transformations::SCALE_16 | ::Transformations::STRIP_16,
-            limits: Limits::default(),
+            limits: l,
         }
     }
 
@@ -94,14 +98,12 @@ impl<R: Read> Decoder<R> {
     /// // This image is 32x32 pixels, so it's more than four pixels in size.
     /// let mut limits = Limits::default();
     /// limits.pixels = 4;
-    /// let mut decoder = Decoder::new(File::open("tests/pngsuite/basi0g01.png").unwrap());
-    /// decoder.set_limits(limits);
+    /// let mut decoder = Decoder::new_with_limits(File::open("tests/pngsuite/basi0g01.png", limits).unwrap());
     /// assert!(decoder.read_info().is_err());
     /// // This image is 32x32 pixels, so it's exactly 1024 pixels in size.
     /// let mut limits = Limits::default();
     /// limits.pixels = 1024;
-    /// let mut decoder = Decoder::new(File::open("tests/pngsuite/basi0g01.png").unwrap());
-    /// decoder.set_limits(limits);
+    /// let mut decoder = Decoder::new_with_limits(File::open("tests/pngsuite/basi0g01.png", limits).unwrap());
     /// assert!(decoder.read_info().is_ok());
     /// ```
     pub fn set_limits(&mut self, limits: Limits) {