Improve best-filter-per-line heuristic used in filter mode 5

Fixes #16
shssoichiro · Mar 10, 2016 · f1e6506 · f1e6506
1 parent 3f42eae
commit f1e6506
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,5 +1,6 @@
 **Version 0.2.1**
  - Add rustdoc for public methods and structs
+ - Improve filter mode 5 heuristic ([#16](https://github.com/shssoichiro/oxipng/issues/16))
 
 **Version 0.2.0**
  - Fix program version that is displayed when running `oxipng -V`

diff --git a/src/lib.rs b/src/lib.rs
@@ -272,7 +272,7 @@ pub fn optimize(filepath: &Path, opts: &Options) -> Result<(), String> {
             const PRESERVED_HEADERS: [&'static str; 9] = ["cHRM", "gAMA", "iCCP", "sBIT", "sRGB",
                                                           "bKGD", "hIST", "pHYs", "sPLT"];
             let mut preserved = HashMap::new();
-            for (hdr, contents) in png.aux_headers.iter() {
+            for (hdr, contents) in &png.aux_headers {
                 if PRESERVED_HEADERS.contains(&hdr.as_ref()) {
                     preserved.insert(hdr.clone(), contents.clone());
                 }