1 files changed, 22 insertions, 17 deletions

diff --git a/src/ocr.rs b/src/ocr.rs
index cde116f..14021cc 100644
--- a/src/ocr.rs
+++ b/src/ocr.rs
@@ -1,18 +1,27 @@
 use image::{DynamicImage, GrayImage, ImageFormat};
 use imageproc::template_matching::MatchTemplateMethod;
+use lazy_static::lazy_static;
 
-const REFERENCE_PNGS: [&[u8]; 10] = [
-    include_bytes!("../data/0.png"),
-    include_bytes!("../data/1.png"),
-    include_bytes!("../data/2.png"),
-    include_bytes!("../data/3.png"),
-    include_bytes!("../data/4.png"),
-    include_bytes!("../data/5.png"),
-    include_bytes!("../data/6.png"),
-    include_bytes!("../data/7.png"),
-    include_bytes!("../data/8.png"),
-    include_bytes!("../data/9.png"),
-];
+lazy_static! {
+    static ref REFERENCES: [GrayImage; 10] = {
+        let parse = |data: &[u8]| {
+            let png = image::load_from_memory_with_format(data, ImageFormat::Png).unwrap();
+            image::imageops::grayscale(&png)
+        };
+        [
+            parse(include_bytes!("../data/0.png")),
+            parse(include_bytes!("../data/1.png")),
+            parse(include_bytes!("../data/2.png")),
+            parse(include_bytes!("../data/3.png")),
+            parse(include_bytes!("../data/4.png")),
+            parse(include_bytes!("../data/5.png")),
+            parse(include_bytes!("../data/6.png")),
+            parse(include_bytes!("../data/7.png")),
+            parse(include_bytes!("../data/8.png")),
+            parse(include_bytes!("../data/9.png")),
+        ]
+    };
+}
 
 fn x_matches(image: &GrayImage, template: &GrayImage) -> Vec<u32> {
     let match_values = imageproc::template_matching::match_template(
@@ -31,11 +40,7 @@ pub fn ocr(image: DynamicImage) -> Option<u32> {
     let grayscale_image = image::imageops::grayscale(&image);
     let mut digit_x_positions: Vec<(u8, u32)> = (0..10)
         .flat_map(|i| {
-            let png_i =
-                image::load_from_memory_with_format(REFERENCE_PNGS[i as usize], ImageFormat::Png)
-                    .unwrap();
-            let grey_png_i = image::imageops::grayscale(&png_i);
-            x_matches(&grayscale_image, &grey_png_i)
+            x_matches(&grayscale_image, &REFERENCES[i as usize])
                 .into_iter()
                 .map(move |x| (i, x))
         })