From c421a12fea3276d7a9230364d01d7d158015f828 Mon Sep 17 00:00:00 2001
From: Jaime Passos <lazymyuutsu@gmail.com>
Date: Fri, 15 May 2020 16:41:39 -0300
Subject: [PATCH] Fix ASTBlendPixel outputting empty pixels if the background
 pixel was empty, BUT if the foreground pixel had no alpha at all

---
 src/r_data.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/r_data.c b/src/r_data.c
index 831e75bef..21f382845 100644
--- a/src/r_data.c
+++ b/src/r_data.c
@@ -244,7 +244,13 @@ UINT32 ASTBlendPixel(RGBA_t background, RGBA_t foreground, int style, UINT8 alph
 
 			// if the background pixel is empty, match software and don't blend anything
 			if (!background.s.alpha)
-				output.rgba = 0;
+			{
+				// ...unless the foreground pixel ISN'T actually translucent.
+				if (alpha == 0xFF)
+					output.rgba = foreground.rgba;
+				else
+					output.rgba = 0;
+			}
 			else
 			{
 				UINT8 beta = (0xFF - alpha);