From a9f6c4b6225d4091d861b00f61dc84ccd9d3d81b Mon Sep 17 00:00:00 2001
From: Lephe <sebastien.michelland@protonmail.com>
Date: Wed, 2 Jun 2021 11:22:29 +0200
Subject: [PATCH] display-cg: fix a bug in bopti r5g6b6 for very thin images

---
 src/render-cg/bopti-asm.s | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/render-cg/bopti-asm.s b/src/render-cg/bopti-asm.s
index 84149f8..dd63124 100644
--- a/src/render-cg/bopti-asm.s
+++ b/src/render-cg/bopti-asm.s
@@ -66,6 +66,8 @@ _bopti_r5g6b5:
 	add	r3, r5
 
 	mov	r6, r10
+	tst	r6, r6
+	bt	.r5g6b5_y_end
 
 .r5g6b5_x:
 	# Copy longwords
@@ -76,7 +78,7 @@ _bopti_r5g6b5:
 	bf.s	.r5g6b5_x
 	add	#4, r5
 
-# -
+.r5g6b5_y_end:
 
 	add	r8, r4
 	dt	r7