From: dooglus <dooglus@1f10aa63-cdf2-0310-b900-c93c546f37ac>
Date: Wed, 23 Jan 2008 17:40:47 +0000 (+0000)
Subject: Add new method Layer::reads_context() which returns true iff the layer needs to be... 
X-Git-Url: https://git.pterodactylus.net/?a=commitdiff_plain;h=b82a781c2bb8dc8cad09ea94beebf6053827acb9;p=synfig.git

Add new method Layer::reads_context() which returns true iff the layer needs to be able to see its context (underlying layers) to work.


git-svn-id: http://svn.voria.com/code@1430 1f10aa63-cdf2-0310-b900-c93c546f37ac
---

diff --git a/synfig-core/trunk/src/synfig/layer.cpp b/synfig-core/trunk/src/synfig/layer.cpp
index bc65a6d..488d6b7 100644
--- a/synfig-core/trunk/src/synfig/layer.cpp
+++ b/synfig-core/trunk/src/synfig/layer.cpp
@@ -371,6 +371,12 @@ Layer::clone(const GUID& deriv_guid) const
 	return ret;
 }
 
+bool
+Layer::reads_context() const
+{
+	return false;
+}
+
 Rect
 Layer::get_full_bounding_rect(Context context)const
 {
diff --git a/synfig-core/trunk/src/synfig/layer.h b/synfig-core/trunk/src/synfig/layer.h
index fa7b3b7..a995299 100644
--- a/synfig-core/trunk/src/synfig/layer.h
+++ b/synfig-core/trunk/src/synfig/layer.h
@@ -428,6 +428,14 @@ public:
 	//! Duplicates the Layer
 	virtual Handle clone(const GUID& deriv_guid=GUID())const;
 
+	//! Returns true if the layer needs to be able to examine its context.
+	/*! context to render itself, other than for simple blending.  For
+	**  example, the blur layer will return true - it can't do its job
+	**  if it can't see its context, and the circle layer will return
+	**  false - rendering a circle doesn't depend on the underlying
+	**  context until the final blend operation. */
+	virtual bool reads_context()const;
+
 #ifdef THIS_CODE_IS_NOT_USED
 	//! Duplicates the Layer without duplicating the value nodes
 	virtual Layer *simple_clone()const;