From e9c800b3bef90bb8e1a3a65c981d5fc0efd159ad Mon Sep 17 00:00:00 2001
From: Rangi <sylvie.oukaour+rangi42@gmail.com>
Date: Sat, 12 Sep 2026 14:17:33 -0400
Subject: [PATCH] Fix reversing 1bpp images

Fixes #2075
---
 src/gfx/reverse.cpp                 |   2 +-
 test/gfx/reverse_1bit_palette.1bpp  |   1 +
 test/gfx/reverse_1bit_palette.flags |   1 +
 test/gfx/reverse_1bit_palette.pal   | Bin 0 -> 4 bytes
 4 files changed, 3 insertions(+), 1 deletion(-)
 create mode 100644 test/gfx/reverse_1bit_palette.1bpp
 create mode 100644 test/gfx/reverse_1bit_palette.flags
 create mode 100644 test/gfx/reverse_1bit_palette.pal

diff --git a/src/gfx/reverse.cpp b/src/gfx/reverse.cpp
index 9d6a6c35..a99609e7 100644
--- a/src/gfx/reverse.cpp
+++ b/src/gfx/reverse.cpp
@@ -569,7 +569,7 @@ void reverse() {
 				// If vertically mirrored, fetch the bytes from the other end
 				uint8_t realY = (attribute & 0x40 ? 7 - y : y) * options.bitDepth;
 				uint8_t bitplane0 = tileData[realY];
-				uint8_t bitplane1 = options.bitDepth == 2 ? tileData[realY + 1] : bitplane0;
+				uint8_t bitplane1 = options.bitDepth == 2 ? tileData[realY + 1] : 0;
 				if (attribute & 0x20) { // Handle horizontal flip
 					bitplane0 = flipTable[bitplane0];
 					bitplane1 = flipTable[bitplane1];
diff --git a/test/gfx/reverse_1bit_palette.1bpp b/test/gfx/reverse_1bit_palette.1bpp
new file mode 100644
index 00000000..0a4b2c96
--- /dev/null
+++ b/test/gfx/reverse_1bit_palette.1bpp
@@ -0,0 +1 @@
+
\ No newline at end of file
diff --git a/test/gfx/reverse_1bit_palette.flags b/test/gfx/reverse_1bit_palette.flags
new file mode 100644
index 00000000..e42e920a
--- /dev/null
+++ b/test/gfx/reverse_1bit_palette.flags
@@ -0,0 +1 @@
+-p reverse_1bit_palette.pal
diff --git a/test/gfx/reverse_1bit_palette.pal b/test/gfx/reverse_1bit_palette.pal
new file mode 100644
index 0000000000000000000000000000000000000000..e8fb40dd9cbbb6019e8dba2ad6106332f7b1850d
GIT binary patch
literal 4
Lcmb1VV5k8A0Q>-)

literal 0
HcmV?d00001