Add support for perceptual image encoding

components/config/src/config/image_compression.rs

@@ -0,0 +1,41 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum ImageFormat {
+    Jpeg,
+    Webp,
+    Avif,
+}
+
+impl ImageFormat {
+    pub fn file_extension(&self) -> &str {
+        match self {
+            ImageFormat::Jpeg => "jpg",
+            ImageFormat::Webp => "webp",
+            ImageFormat::Avif => "avif",
+        }
+    }
+}
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub struct ImageCompression {
+    /// Glob of files to run the compression on.
+    pub glob: String,
+    /// The codec to encode files to.
+    pub format: ImageFormat,
+    /// Target SSIM score.
+    #[serde(default = "default_ssim")]
+    pub target_ssim: f64,
+    /// Number of iterations to try and reach target SSIM.
+    #[serde(default = "default_iterations")]
+    pub max_iterations: u8,
+}
+
+fn default_ssim() -> f64 {
+    0.8295
+}
+
+fn default_iterations() -> u8 {
+    5
+}

components/config/src/config/mod.rs

@@ -1,3 +1,4 @@
+pub mod image_compression;
 pub mod languages;
 pub mod link_checker;
 pub mod markup;
@@ -77,6 +78,7 @@ pub struct Config {
     pub compile_sass: bool,
     /// Whether to minify the html output
     pub minify_html: bool,
+    pub compress_images: Option<Vec<image_compression::ImageCompression>>,
     /// Whether to build the search index for the content
     pub build_search_index: bool,
     /// A list of file glob patterns to ignore when processing the content folder. Defaults to none.
@@ -466,6 +468,7 @@ impl Default for Config {
             author: None,
             compile_sass: false,
             minify_html: false,
+            compress_images: None,
             mode: Mode::Build,
             build_search_index: false,
             ignored_content: Vec::new(),

components/config/src/lib.rs

@@ -5,6 +5,7 @@ use std::path::Path;
 
 pub use crate::config::{
     Config,
+    image_compression::{ImageCompression, ImageFormat},
     languages::LanguageOptions,
     link_checker::LinkChecker,
     link_checker::LinkCheckerLevel,

components/site/Cargo.toml

@@ -29,6 +29,9 @@ content = { workspace = true }
 render = { workspace = true }
 markdown = { workspace = true }
 memchr = { workspace = true }
+perceptual-image = { version = "0.1.0", features = ["jpeg", "avif", "webp"] }
+image.workspace = true
+aho-corasick = "1.1.4"
 
 [dev-dependencies]
 tempfile = "3"