X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=synfig-core%2Ftrunk%2Fsrc%2Fsynfig%2Fcolor.h;h=28bed9ca062a287f84e42d2c1fdcbd72eb737b11;hb=392b62fa87099d8576a9da614be431a5046fe595;hp=7c8a356cabf1df6b43a0f5e7b1ac8c582c4c31c3;hpb=b177280b8815c394cb67c713eb34260ebb72de94;p=synfig.git

diff --git a/synfig-core/trunk/src/synfig/color.h b/synfig-core/trunk/src/synfig/color.h
index 7c8a356..28bed9c 100644
--- a/synfig-core/trunk/src/synfig/color.h
+++ b/synfig-core/trunk/src/synfig/color.h
@@ -524,6 +524,15 @@ public:
 			|| x==BLEND_HARD_LIGHT
 		;
 	}
+
+	//! a blending method is considered 'straight' if transparent pixels in the upper layer can affect the result of the blend
+	static bool is_straight(BlendMethod x)
+	{
+		return x==BLEND_STRAIGHT
+			|| x==BLEND_STRAIGHT_ONTO
+			|| x==BLEND_ALPHA_BRIGHTEN
+		;
+	}
 /*protected:
 
 	value_type& operator[](const int i)