Implement optional Skia codec adapter (#41)

crates/libremetaverse-imaging-skia/Cargo.toml

@@ -5,11 +5,27 @@ edition.workspace = true
 rust-version.workspace = true
 license.workspace = true
 repository.workspace = true
-description = "Skia codec shims for the MetaCrate LibreMetaverse rewrite"
+description = "Optional Skia image decoder for the MetaCrate LibreMetaverse rewrite"
+
+[features]
+default = []
+skia = ["dep:skia-safe"]
 
 [dependencies]
-libremetaverse-imaging = { path = "../libremetaverse-imaging" }
-libremetaverse-types = { path = "../libremetaverse-types" }
+libremetaverse-imaging = { version = "0.0.1", path = "../libremetaverse-imaging" }
+libremetaverse-types = { version = "0.0.1", path = "../libremetaverse-types" }
+
+# rust-skia publishes WebP-capable binary caches with Vulkan on Linux/Windows
+# and without Vulkan on macOS. Matching those sets avoids an hours-long Skia
+# source build on every supported desktop target.
+[target.'cfg(any(target_os = "linux", target_os = "windows"))'.dependencies]
+skia-safe = { version = "0.99.0", default-features = false, features = ["binary-cache", "jpeg", "pdf", "svg", "textlayout", "vulkan", "webp"], optional = true }
+
+[target.'cfg(target_os = "macos")'.dependencies]
+skia-safe = { version = "0.99.0", default-features = false, features = ["binary-cache", "jpeg", "pdf", "svg", "textlayout", "webp"], optional = true }
+
+[target.'cfg(not(any(target_os = "linux", target_os = "macos", target_os = "windows")))'.dependencies]
+skia-safe = { version = "0.99.0", default-features = false, features = ["binary-cache", "jpeg", "pdf", "webp"], optional = true }
 
 [lints]
 workspace = true