From: dooglus <dooglus@1f10aa63-cdf2-0310-b900-c93c546f37ac>
Date: Wed, 23 Jan 2008 19:58:41 +0000 (+0000)
Subject: Define new static member Color::is_straight(BlendMethod) to determine whether a blend... 
X-Git-Url: https://git.pterodactylus.net/?a=commitdiff_plain;h=bd49f8f66e4f28239a051ea640c3aafa0476c235;p=synfig.git

Define new static member Color::is_straight(BlendMethod) to determine whether a blend method is 'straight' or not (ie. 'straight', 'straight onto').  Possibly one of alpha_{lighten|darken} will need adding to this as well.


git-svn-id: http://svn.voria.com/code@1436 1f10aa63-cdf2-0310-b900-c93c546f37ac
---

diff --git a/synfig-core/trunk/src/synfig/color.h b/synfig-core/trunk/src/synfig/color.h
index 7c8a356..6c38c6a 100644
--- a/synfig-core/trunk/src/synfig/color.h
+++ b/synfig-core/trunk/src/synfig/color.h
@@ -524,6 +524,14 @@ 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
+		;
+	}
 /*protected:
 
 	value_type& operator[](const int i)