put webp behind a feature flag (vercel/turborepo#4641)

### Description

aarch64 is unable to compile it, so we disable it for now

Author: sokra

crates/turbo-binding/Cargo.toml

@@ -110,6 +110,8 @@ __turbopack_dev_server = ["__turbopack", "turbopack-dev-server"]
 __turbopack_ecmascript = ["__turbopack", "turbopack-ecmascript"]
 __turbopack_env = ["__turbopack", "turbopack-env"]
 __turbopack_image = ["__turbopack", "turbopack-image"]
+__turbopack_image_avif = ["turbopack-image/avif"]
+__turbopack_image_webp = ["turbopack-image/webp"]
 __turbopack_json = ["__turbopack", "turbopack-json"]
 __turbopack_mdx = ["__turbopack", "turbopack-mdx"]
 __turbopack_node = ["__turbopack", "turbopack-node"]

crates/turbopack-image/Cargo.toml

@@ -11,15 +11,17 @@ bench = false
 
 [features]
 avif = ["image/avif-decoder", "image/avif-encoder"]
+webp = ["image/webp", "image/webp-encoder"]
 
 [dependencies]
 anyhow = { workspace = true }
 base64 = "0.21.0"
 image = { workspace = true, default-features = false, features = [
-  "webp",
   "png",
   "jpeg",
-  "webp-encoder",
+  "ico",
+  "bmp",
+  "tga",
 ] }
 indexmap = { workspace = true }
 mime = { workspace = true }

crates/turbopack-image/src/process.rs

@@ -6,7 +6,6 @@ use image::{
     codecs::{
         jpeg::JpegEncoder,
         png::{CompressionType, PngEncoder},
-        webp::{WebPEncoder, WebPQuality},
     },
     imageops::FilterType,
     GenericImageView, ImageEncoder, ImageFormat,
@@ -100,7 +99,9 @@ fn compute_blur_data(
                 Base64Display::new(&buf, &STANDARD)
             )
         }
+        #[cfg(feature = "webp")]
         ImageFormat::WebP => {
+            use image::webp::{WebPEncoder, WebPQuality};
             WebPEncoder::new_with_quality(&mut buf, WebPQuality::lossy(options.quality))
                 .write_image(
                     small_image.as_bytes(),
@@ -127,7 +128,10 @@ fn compute_blur_data(
                 Base64Display::new(&buf, &STANDARD)
             )
         }
-        _ => unreachable!(),
+        _ => bail!(
+            "Ecoding for image format {:?} has not been compiled into the current build",
+            format
+        ),
     };
 
     Ok((url, blur_width, blur_height))