From 56ab0f93fbe02c667082cfe4dace4d83e28584ff Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sat, 20 Mar 2021 16:09:46 +0000
Subject: [PATCH] updates: Provide piece_update_image

This is the actual entrypoint

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 src/pcrender.rs | 13 +++++++++++++
 src/updates.rs  | 20 ++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/src/pcrender.rs b/src/pcrender.rs
index 86978638..ed961ca3 100644
--- a/src/pcrender.rs
+++ b/src/pcrender.rs
@@ -129,6 +129,19 @@ impl PieceRenderInstructions {
     r
   }
 
+  #[throws(IE)]
+  pub fn prep_pieceimage(&self, ioccults: &IOccults, gs: &GameState,
+                         gpc: &GPiece, ipc: &IPiece)
+                         -> PreparedPieceImage {
+    let pri = self;
+    let r = PreparedPieceImage {
+      svg        : pri.make_defs(ioccults, gs, gpc, ipc)?,
+      uos        : pri.ui_operations(gpc, ipc)?,
+    };
+    dbgc!(pri, ipc, gpc, r);
+    r
+  }
+
   pub fn angle(&self, gpc: &GPiece) -> VisiblePieceAngle {
     match self.occulted {
       PriOcculted::Visible(_)                            => gpc.angle,
diff --git a/src/updates.rs b/src/updates.rs
index 78bacdef..d6513a72 100644
--- a/src/updates.rs
+++ b/src/updates.rs
@@ -727,6 +727,26 @@ impl<'r> PrepareUpdatesBuffer<'r> {
     self.us.push(update);
   }
 
+  #[throws(InternalError)]
+  pub fn piece_update_image(&mut self, piece: PieceId) {
+    // Use this only for updates which do not change the set of valid UOs
+    // or other operations or move the piece etc.
+    let ims = self.piece_update_fallible_players(
+      piece, |_,_,_|(), |_,_|(),
+
+      |ioccults,gs,gpc,ipc,_player,pri| {
+        let im = pri.as_ref().map(|pri| {
+          let im = pri.prep_pieceimage(ioccults,gs,gpc,ipc)?;
+          Ok::<_,IE>(PreparedPieceUpdateGeneral { piece: pri.vpid, op: im })
+        }).transpose()?;
+        Ok::<_,IE>(im)
+      },
+
+      |_gpl| None,
+    )?;
+    PreparedUpdateEntry_Image { ims }
+  }
+
   pub fn piece_updates(&mut self, updates: Vec<(PieceId, PieceUpdateOps)>) {
     for (piece, ops) in updates {
       self.piece_update(piece, ops);
-- 
2.30.2