Implement appearance baking pipeline (#66)

crates/libremetaverse/src/baking_texture_provider.rs

@@ -0,0 +1,56 @@
+//! Default decoded-texture provider for the avatar baking pipeline.
+
+use crate::client_core::ClientWeakHandle;
+use crate::{Error, GridClient, IBakingTextureProvider};
+use libremetaverse_types::UUID;
+use libremetaverse_types::compat::CancellationToken;
+use std::future::Future;
+use std::pin::Pin;
+
+pub struct GridClientBakingTextureProvider {
+    client: ClientWeakHandle,
+}
+
+impl GridClientBakingTextureProvider {
+    #[allow(clippy::needless_pass_by_value, clippy::unnecessary_wraps)]
+    // The generated constructor owns its GridClient argument and uses the shared Result model.
+    pub(crate) fn native_new(client: GridClient) -> Result<Self, Error> {
+        Ok(Self {
+            client: client.native_weak_handle(),
+        })
+    }
+
+    pub(crate) async fn native_request_texture(
+        &self,
+        texture_id: UUID,
+        cancellation_token: Option<CancellationToken>,
+    ) -> Result<Option<crate::assets::AssetTexture>, Error> {
+        let token = cancellation_token.unwrap_or_default();
+        token.throw_if_cancellation_requested()?;
+        let client = self.client.upgrade().ok_or(Error::InvalidOperation)?;
+        let Some(mut texture) = client
+            .native_assets()?
+            .request_image(texture_id, None, Some(token.clone()))
+            .await?
+        else {
+            return Ok(None);
+        };
+        token.throw_if_cancellation_requested()?;
+        if texture.native_decode_image()? {
+            Ok(Some(texture))
+        } else {
+            Ok(None)
+        }
+    }
+}
+
+impl IBakingTextureProvider for GridClientBakingTextureProvider {
+    fn request_texture(
+        &self,
+        texture_id: UUID,
+        cancellation_token: Option<CancellationToken>,
+    ) -> Pin<Box<dyn Future<Output = Result<Option<crate::assets::AssetTexture>, Error>> + Send + '_>>
+    {
+        Box::pin(self.native_request_texture(texture_id, cancellation_token))
+    }
+}