From 69220505b6109227984f0d5de97180e989d1adce Mon Sep 17 00:00:00 2001
From: Johannes Schickel
Date: Mon, 14 Dec 2015 05:14:09 +0100
Subject: GRAPHICS: Add function to query TransparentSurface's builtin
 PixelFormat.

---
 graphics/transparent_surface.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/graphics/transparent_surface.h b/graphics/transparent_surface.h
index 4a23522aab..0cd7d5b2e9 100644
--- a/graphics/transparent_surface.h
+++ b/graphics/transparent_surface.h
@@ -75,6 +75,18 @@ struct TransparentSurface : public Graphics::Surface {
 	TransparentSurface();
 	TransparentSurface(const Graphics::Surface &surf, bool copyData = false);
 
+	/**
+	 * Returns the pixel format all operations of TransparentSurface support.
+	 *
+	 * Unlike Surface TransparentSurface only works with a fixed pixel format.
+	 * This format can be queried using this static function.
+	 *
+	 * @return Supported pixel format.
+	 */
+	static PixelFormat getSupportedPixelFormat() {
+		return PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0);
+	}
+
 	void setColorKey(char r, char g, char b);
 	void disableColorKey();
 
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