feat(imaging): add pure-Rust JPEG 2000 backend (#109)

tools/check_milestone_06.py

@@ -44,6 +44,8 @@ def check_features() -> None:
         raise SystemExit("imaging default features must stay empty")
     if imaging["features"].get("jpeg2000") != ["dep:libremetaverse-openjpeg"]:
         raise SystemExit("JPEG 2000 must stay isolated behind its optional feature")
+    if imaging["features"].get("rust-j2k") != ["dep:j2k"]:
+        raise SystemExit("pure-Rust JPEG 2000 must stay isolated behind rust-j2k")
     if not imaging["dependencies"]["libremetaverse-openjpeg"].get("optional"):
         raise SystemExit("the OpenJPEG adapter dependency must stay optional")
 

tools/ci-matrix/src/api_surface.rs

@@ -916,6 +916,10 @@ fn validate_features(name: &str, actual: &BTreeMap<String, Vec<String>>) -> Resu
                 "jpeg2000".to_owned(),
                 vec!["libremetaverse-imaging/jpeg2000".to_owned()],
             ),
+            (
+                "rust-j2k".to_owned(),
+                vec!["libremetaverse-imaging/rust-j2k".to_owned()],
+            ),
             ("vorbis".to_owned(), vec!["dep:vorbis_rs".to_owned()]),
         ]),
         "libremetaverse-imaging" => BTreeMap::from([
@@ -924,6 +928,7 @@ fn validate_features(name: &str, actual: &BTreeMap<String, Vec<String>>) -> Resu
                 "jpeg2000".to_owned(),
                 vec!["dep:libremetaverse-openjpeg".to_owned()],
             ),
+            ("rust-j2k".to_owned(), vec!["dep:j2k".to_owned()]),
         ]),
         "libremetaverse-imaging-skia" => BTreeMap::from([
             ("default".to_owned(), Vec::new()),

tools/ci-matrix/src/ci_gate.rs

@@ -637,6 +637,30 @@ fn test_commands() -> Vec<CommandSpec> {
                 "--locked",
             ],
         ),
+        CommandSpec::new(
+            "cargo",
+            &[
+                "test",
+                "-p",
+                "libremetaverse-imaging",
+                "--no-default-features",
+                "--features",
+                "rust-j2k",
+                "--locked",
+            ],
+        ),
+        CommandSpec::new(
+            "cargo",
+            &[
+                "test",
+                "-p",
+                "libremetaverse-imaging",
+                "--no-default-features",
+                "--features",
+                "jpeg2000,rust-j2k",
+                "--locked",
+            ],
+        ),
     ]
 }
 

tools/ci-matrix/src/lib.rs

@@ -38,7 +38,7 @@ const REQUIRED_PROFILES: [&str; 7] = [
     "windows-stable-portable",
     "macos-stable-portable",
 ];
-const REQUIRED_FEATURE_SETS: [&str; 11] = [
+const REQUIRED_FEATURE_SETS: [&str; 12] = [
     "all-features",
     "dds-bc67",
     "default",
@@ -47,15 +47,18 @@ const REQUIRED_FEATURE_SETS: [&str; 11] = [
     "jpeg2000",
     "no-default-features",
     "real-audio",
+    "rust-j2k",
     "skia",
     "tests",
     "vorbis",
 ];
-const REQUIRED_FEATURES: [(&str, &str); 6] = [
+const REQUIRED_FEATURES: [(&str, &str); 8] = [
     ("libremetaverse", "dds-bc67"),
     ("libremetaverse", "jpeg2000"),
+    ("libremetaverse", "rust-j2k"),
     ("libremetaverse", "vorbis"),
     ("libremetaverse-imaging", "jpeg2000"),
+    ("libremetaverse-imaging", "rust-j2k"),
     ("libremetaverse-imaging-skia", "skia"),
     ("libremetaverse-voice-webrtc", "real-audio"),
 ];