From 348c7dbc56ffbe490be4cdfb51d886379ea2008f Mon Sep 17 00:00:00 2001
From: Josh Holmer <jholmer.in@gmail.com>
Date: Tue, 30 Jan 2018 22:21:31 -0500
Subject: [PATCH] Extract a function into a submodule

---
 src/colors.rs  | 10 ++++++++++
 src/png/mod.rs |  7 +------
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/src/colors.rs b/src/colors.rs
index dd6e7866..c06e7dd9 100644
--- a/src/colors.rs
+++ b/src/colors.rs
@@ -44,6 +44,16 @@ impl ColorType {
             ColorType::RGBA => 6,
         }
     }
+
+    #[inline]
+    pub fn channels_per_pixel(&self) -> u8 {
+        match *self {
+            ColorType::Grayscale | ColorType::Indexed => 1,
+            ColorType::GrayscaleAlpha => 2,
+            ColorType::RGB => 3,
+            ColorType::RGBA => 4,
+        }
+    }
 }
 
 #[derive(Debug, PartialEq, Clone, Copy)]
diff --git a/src/png/mod.rs b/src/png/mod.rs
index ebc38d25..5f1e9a90 100644
--- a/src/png/mod.rs
+++ b/src/png/mod.rs
@@ -172,12 +172,7 @@ impl PngData {
     /// Return the number of channels in the image, based on color type
     #[inline]
     pub fn channels_per_pixel(&self) -> u8 {
-        match self.ihdr_data.color_type {
-            ColorType::Grayscale | ColorType::Indexed => 1,
-            ColorType::GrayscaleAlpha => 2,
-            ColorType::RGB => 3,
-            ColorType::RGBA => 4,
-        }
+        self.ihdr_data.color_type.channels_per_pixel()
     }
 
     /// Format the `PngData` struct into a valid PNG bytestream