Only reconstruct on debug

src/descriptors/dct.rs

@@ -1,7 +1,7 @@
 use image::{save_buffer, GenericImageView};
 use std::f64::consts::{PI, SQRT_2};
 use crate::descriptors::{Descriptor, DCT, print_matrix};
-use log::debug;
+use log::{debug, log_enabled, Level};
 
 
 impl DCT {
@@ -114,23 +114,25 @@ impl Descriptor for DCT {
         }
         debug!("DCT-coefficients, quantized:\n {}", print_matrix(dct_values));
 
-        // De-quantization:
-        for i in 0..64 {
-            dct_values[i] = dct_values[i] * self.quantization_matrix[i] as f64;
+        if log_enabled!(Level::Debug) {
+            // De-quantization:
+            for i in 0..64 {
+                dct_values[i] = dct_values[i] * self.quantization_matrix[i] as f64;
+            }
+            debug!("DCT-coefficients, de-quantized:\n {}", print_matrix(dct_values));
+
+            // Reconstruction original pixel values:
+            let reconstructed = self.idct(dct_values);
+            debug!("Reconstructed pixel values:\n{}", print_matrix(reconstructed));
+
+            save_buffer(
+                "reconstructed.png",
+                &reconstructed,
+                8, 
+                8,
+                image::ColorType::L8
+            ).expect("Error saving buffer");
         }
-        debug!("DCT-coefficients, de-quantized:\n {}", print_matrix(dct_values));
-
-        // Reconstruction original pixel values:
-		let reconstructed = self.idct(dct_values);
-        debug!("Reconstructed pixel values:\n{}", print_matrix(reconstructed));
-
-        save_buffer(
-            "reconstructed.png",
-            &reconstructed,
-            8, 
-            8,
-            image::ColorType::L8
-        ).expect("Error saving buffer");
 
         // Calculating descriptor from dct values:
         let mut mask: u64 = 0;