X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=synfig-studio%2Ftrunk%2Fsrc%2Fsynfigapp%2Fblineconvert.cpp;h=71214c9055ac73964d4efe7033c5b801bcb917e2;hb=0b9725d16c8d5204b5e8f6557e97caf5aa328d9e;hp=45ab5fcd48a2d9df09fca0e428c5d41bf29da140;hpb=3cc0ca894a70090b26789e4c85fd25db035b6673;p=synfig.git

diff --git a/synfig-studio/trunk/src/synfigapp/blineconvert.cpp b/synfig-studio/trunk/src/synfigapp/blineconvert.cpp
index 45ab5fc..71214c9 100644
--- a/synfig-studio/trunk/src/synfigapp/blineconvert.cpp
+++ b/synfig-studio/trunk/src/synfigapp/blineconvert.cpp
@@ -39,6 +39,8 @@
 #include <synfig/general.h>
 #include <cassert>
 
+#include "general.h"
+
 #endif
 
 /* === U S I N G =========================================================== */
@@ -602,7 +604,22 @@ synfigapp::BLineConverter::operator () (std::list<synfig::BLinePoint> &out, cons
 				gaussian_blur_3(ftemp.begin(),ftemp.end(),false);
 
 			df.resize(size);
+
+			// Wondering whether the modification of the df vector
+			// using a char* pointer and pointer arithmetric was safe,
+			// I looked it up...
+			// 
+			// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2369.pdf tells me:
+			// 
+			//	23.2.5  Class template vector [vector]
+			// 
+			//	[...] The elements of a vector are stored contiguously,
+			//	meaning that if v is a vector<T,Allocator> where T is
+			//	some type other than bool, then it obeys the identity
+			//	&v[n] == &v[0] + n for all 0 <= n < v.size().
+			// 
 			GetFirstDerivatives(ftemp,0,size,(char*)&df[0],sizeof(df[0]));
+
 			//GetSimpleDerivatives(ftemp,0,size,df,0,di);
 			//< don't have to worry about indexing stuff as it is all being taken care of right now
 			//preproceval += timer();