blend file thumbnailing

- uses same thumbnail system as image browser
- blend files show thumbnails in ubuntu/gnome (freedesktop spec)
- 128x128 images are embedded into the blend file header, a simple loader avoids reading the entire blend file to extract it when generating thumbnails in the file selector.
  When the image browser reads a directory it loads images and creates thumbnails, blend files embedded images are treated just like loading an image.
- the thumbnail is created from the camera view in solid mode. (no camera == no thumbnal).
- readfile/writefile.c: had to use the 'TEST' code name to save thumbnails, anything else would segfault older blender versions on load. (its not used elsewhere).

2 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/blenkernel/BKE_utildefines.h b/source/blender/blenkernel/BKE_utildefines.h
index 73323c5a960..925b1d7171a 100644
--- a/source/blender/blenkernel/BKE_utildefines.h
+++ b/source/blender/blenkernel/BKE_utildefines.h
@@ -166,7 +166,7 @@
 #define IMAG MAKE_ID('I','M','A','G')
 
 #define DNA1 MAKE_ID('D','N','A','1')
-#define TEST MAKE_ID('T','E','S','T')
+#define TEST MAKE_ID('T','E','S','T') /* used as preview between 'REND' and 'GLOB' */
 #define REND MAKE_ID('R','E','N','D')
 #define USER MAKE_ID('U','S','E','R')
 
diff --git a/source/blender/blenkernel/intern/blender.c b/source/blender/blenkernel/intern/blender.c
index 5d12675952c..046b8de2431 100644
--- a/source/blender/blenkernel/intern/blender.c
+++ b/source/blender/blenkernel/intern/blender.c
@@ -534,7 +534,7 @@ void BKE_write_undo(bContext *C, char *name)
 		sprintf(numstr, "%d.blend", counter);
 		BLI_make_file_string("/", tstr, btempdir, numstr);
 	
-		success= BLO_write_file(CTX_data_main(C), tstr, G.fileflags, NULL);
+		success= BLO_write_file(CTX_data_main(C), tstr, G.fileflags, NULL, NULL);
 		
 		strcpy(curundo->str, tstr);
 	}