From 9cf30e28947dd23d30ce54a010d9d9b5332349fc Mon Sep 17 00:00:00 2001
From: Bruno Ancona <brunoanconasala@gmail.com>
Date: Sun, 1 Sep 2024 17:58:27 -0600
Subject: [PATCH] Fix exporting R8 files as PNG using libpng

Fixes an incorrect stride value for R8 images being exported to PNG on
the experimental libpng SaveToPNGFile implementation.
---
 Auxiliary/DirectXTexPNG.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Auxiliary/DirectXTexPNG.cpp b/Auxiliary/DirectXTexPNG.cpp
index 06181b78..d2d9f6a6 100644
--- a/Auxiliary/DirectXTexPNG.cpp
+++ b/Auxiliary/DirectXTexPNG.cpp
@@ -266,6 +266,7 @@ namespace
             {
             case DXGI_FORMAT_R8_UNORM:
                 color_type = PNG_COLOR_TYPE_GRAY;
+                channel = 1;
                 break;
             case DXGI_FORMAT_B8G8R8A8_UNORM:
             case DXGI_FORMAT_B8G8R8X8_UNORM: