Removed traces of TryFrom to make printpdf compile on stable

README.md

@@ -121,13 +121,11 @@
  Scaling of images is implicitly done to fit one pixel = one dot at 300 dpi.
 
  ```
- #![feature(try_from)]
  extern crate printpdf;
  extern crate image; /* currently: version 0.14.0 */
 
  use printpdf::*;
  use std::fs::File;
- use std::convert::TryFrom;
  use std::convert::From;
 
  fn main() {

examples/images.rs

@@ -1,10 +1,8 @@
-#![feature(try_from)]
 extern crate printpdf;
 extern crate image;
 
 use printpdf::*;
 use std::io::Cursor;
-use std::convert::TryFrom; 
 use image::bmp::BMPDecoder;
 use std::fs::File;
 

src/lib.rs

@@ -119,13 +119,11 @@
 //! Scaling of images is implicitly done to fit one pixel = one dot at 300 dpi.
 //!
 //! ```
-//! #![feature(try_from)]
 //! extern crate printpdf;
 //! extern crate image; /* currently: version 0.14.0 */
 //!
 //! use printpdf::*;
 //! use std::fs::File;
-//! use std::convert::TryFrom;
 //! use std::convert::From;
 //!
 //! fn main() {
@@ -321,8 +319,6 @@
 //! [PDF X/3 technical notes](http://www.pdfxreport.com/lib/exe/fetch.php?media=en:technote_pdfx_checks.pdf)
 //!
 
-#![feature(try_from)]
-
 #![allow(unused_doc_comment)]
 #![allow(unused_variables)]
 #![allow(dead_code)]

src/types/pdf_layer.rs

@@ -80,14 +80,13 @@ impl PdfLayerReference {
 
     /// Add an svg element to the layer
     /// To be called from the `svg.add_to_layer()` class (see `use_xobject` documentation)
-    pub(crate) fn add_svg<T>(&self, form: T)
-    -> std::result::Result<XObjectRef, T::Error>
-    where T: std::convert::TryInto<FormXObject>
+    pub(crate) fn add_svg(&self, svg: Svg)
+    -> std::result::Result<XObjectRef, ::std::io::Error>
     {
         let doc = self.document.upgrade().unwrap();
         let mut doc = doc.borrow_mut();
         let page_mut = &mut doc.pages[self.page.0];
-        let form_data = form.try_into()?;
+        let form_data = svg.try_into()?;
         Ok(page_mut.add_xobject(XObject::Form(Box::new(form_data))))
     }
 

src/types/plugins/graphics/two_dimensional/svg.rs

@@ -135,12 +135,8 @@ impl Svg {
 
         Ok(())
     }
-}
-
-impl std::convert::TryInto<FormXObject> for Svg {
-    type Error = std::io::Error;
 
-    fn try_into(self)
+    pub fn try_into(self)
     -> std::result::Result<FormXObject, std::io::Error>
     {
         let content = lopdf::content::Content{ operations: self.operations };