From e678ad1c56cd1a9697669a788d38ef1619a0a39c Mon Sep 17 00:00:00 2001
From: David Michael Barr <b@rr-dav.id.au>
Date: Mon, 16 Oct 2023 22:35:05 +0900
Subject: [PATCH] Fix assertion against entering lossless mode

When skipping, we may ignore the quantizer value. Fixes #3209.
---
 src/encoder.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/encoder.rs b/src/encoder.rs
index a3ee7e32e8..bfed8ff55d 100644
--- a/src/encoder.rs
+++ b/src/encoder.rs
@@ -2239,7 +2239,11 @@ pub fn write_tx_blocks<T: Pixel, W: Writer>(
   let bw = bsize.width_mi() / tx_size.width_mi();
   let bh = bsize.height_mi() / tx_size.height_mi();
   let qidx = get_qidx(fi, ts, cw, tile_bo);
-  assert_ne!(qidx, 0); // lossless is not yet supported
+
+  // TODO: Lossless is not yet supported.
+  if !skip {
+    assert_ne!(qidx, 0);
+  }
 
   let PlaneConfig { xdec, ydec, .. } = ts.input.planes[1].cfg;
   // SAFETY: We write to the array below before reading from it.