[Bf-blender-cvs] [893fa598319] master: readfile: re-enable read on demand for WIN32

[Campbell Barton]

Commit: 893fa598319e0d263ce48514c13c1ebbaae09cd7
Author: Campbell Barton
Date:   Mon Feb 25 08:54:10 2019 +1100
Branches: master
https://developer.blender.org/rB893fa598319e0d263ce48514c13c1ebbaae09cd7

readfile: re-enable read on demand for WIN32

Revert workaround for T61855. It's likely this was caused by slow seek
for compressed files since the same behavior happens on Linux T61880.

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

M	source/blender/blenloader/intern/readfile.c

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

diff --git a/source/blender/blenloader/intern/readfile.c b/source/blender/blenloader/intern/readfile.c
index bb7ff4efaa5..7c455c7c20f 100644
--- a/source/blender/blenloader/intern/readfile.c
+++ b/source/blender/blenloader/intern/readfile.c
@@ -224,10 +224,12 @@
 
 /**
  * Delay reading blocks we might not use (especially applies to library linking).
- * which keeps large arrays in memory from data-blocks we may not even use. */
-#if !defined(_WIN32)  /* Slow on windows, see: T61855 */
-#  define USE_BHEAD_READ_ON_DEMAND
-#endif
+ * which keeps large arrays in memory from data-blocks we may not even use.
+ *
+ * \note This is disabled when using compression,
+ * while zlib supports seek ist's unusably slow, see: T61880.
+ */
+#define USE_BHEAD_READ_ON_DEMAND
 
 /* use GHash for BHead name-based lookups (speeds up linking) */
 #define USE_GHASH_BHEAD