[Bf-blender-cvs] [322f86d] master: Fix T47896: Scripted Expression string length limit is too short for some autogenerated expressions

[Joshua Leung]

Commit: 322f86d6b330ebeb1da5c1f527714745dc901460
Author: Joshua Leung
Date:   Thu Mar 24 13:02:22 2016 +1300
Branches: master
https://developer.blender.org/rB322f86d6b330ebeb1da5c1f527714745dc901460

Fix T47896: Scripted Expression string length limit is too short for some autogenerated expressions

While most scripted expressions are quite short (e.g. "var" or "frame + 1"),
those that are autogenerated by scripts (to take into account a wide range of factors)
may require a bit more headroom to operate in.

By doubling the maximum length here, we now make it possible to combine up to 38
3-letter variables in some linear combination (with all factors expressed to 4 dp).
That should be more than enough for anyone or anything for quite a while!

Unfortunately, this does increase memory consumption for drivers across the board.

===================================================================

M	source/blender/makesdna/DNA_anim_types.h

===================================================================

diff --git a/source/blender/makesdna/DNA_anim_types.h b/source/blender/makesdna/DNA_anim_types.h
index e41ca93..d80b509 100644
--- a/source/blender/makesdna/DNA_anim_types.h
+++ b/source/blender/makesdna/DNA_anim_types.h
@@ -374,7 +374,7 @@ typedef struct ChannelDriver {
 	/* python expression to execute (may call functions defined in an accessory file) 
 	 * which relates the target 'variables' in some way to yield a single usable value
 	 */
-	char expression[256];	/* expression to compile for evaluation */
+	char expression[512];	/* expression to compile for evaluation */
 	void *expr_comp; 		/* PyObject - compiled expression, don't save this */
 	
 	float curval;		/* result of previous evaluation */