From 8a8a5726cef8b8cb3c32e670fd200d49f3b04c28 Mon Sep 17 00:00:00 2001
From: neonloop
Date: Sat, 28 Aug 2021 21:27:17 +0000
Subject: Fixes scaler selection when dimensions are not set yet

---
 README.md | 2 +-
 scale.c   | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index ff05cd4..e0cae71 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ git clone --recurse-submodules https://git.crowdedwood.com/picoarch
 
 To build picoarch itself, you need libSDL 1.2, libpng, and libasound. Different cores may need additional dependencies.
 
-After that, `make` bulids picoarch and all supported cores into this directory.
+After that, `make` builds picoarch and all supported cores into this directory.
 
 ### TrimUI instructions
 
diff --git a/scale.c b/scale.c
index acf03e3..3c6265e 100644
--- a/scale.c
+++ b/scale.c
@@ -392,6 +392,7 @@ static void scale_sharp_256xXXX_320xXXX(unsigned w, unsigned h, size_t pitch, co
 
 static void scale_select_scaler(unsigned w, unsigned h, size_t pitch) {
 	double current_aspect_ratio = aspect_ratio > 0 ? aspect_ratio : ((double)w / (double)h);
+	if (w == 0 || h == 0 || pitch == 0) return;
 
 	/* mame2000 sets resolutions / aspect ratio without notifying
 	 * of changes, new should always override old */
-- 
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