Made rustdct an optional dependency

Author: OrangeHoopla

Cargo.toml

@@ -12,10 +12,9 @@ homepage = "https://github.com/image-rs/imageproc"
 exclude = [".github/*", "examples/*", "tests/*"]
 
 [features]
-default = ["rayon", "image/default","ab_glyph"]
+default = ["rayon", "image/default", "ab_glyph", "rustdct"]
 display-window = ["sdl2"]
 rayon = ["dep:rayon", "image/rayon"]
-ab_glyph = ["dep:ab_glyph"]
 
 [dependencies]
 ab_glyph = { version = "0.2.23", default-features = false, features = ["std"], optional = true}
@@ -37,7 +36,7 @@ sdl2 = { version = "0.38.0", optional = true, default-features = false, features
     "bundled",
 ] }
 katexit = { version = "0.1.4", optional = true, default-features = false }
-rustdct = "0.7.1"
+rustdct = { version = "0.7.1", optional = true }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 getrandom = { version = "0.3.0", default-features = false, features = ["wasm_js"] }

src/lib.rs

@@ -37,6 +37,7 @@ pub mod gradients;
 pub mod haar;
 pub mod hog;
 pub mod hough;
+#[cfg(feature = "rustdct")]
 pub mod image_hash;
 pub mod integral_image;
 pub mod kernel;