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).

1 files changed, 5 insertions, 2 deletions

diff --git a/source/blender/imbuf/IMB_thumbs.h b/source/blender/imbuf/IMB_thumbs.h
index c7e39b9e0d7..ecb0ba8abd1 100644
--- a/source/blender/imbuf/IMB_thumbs.h
+++ b/source/blender/imbuf/IMB_thumbs.h
@@ -50,13 +50,14 @@ typedef enum ThumbSize {
 
 typedef enum ThumbSource {
 	THB_SOURCE_IMAGE,
-	THB_SOURCE_MOVIE
+	THB_SOURCE_MOVIE,
+	THB_SOURCE_BLEND
 } ThumbSource;
 
 // IB_metadata
 
 /* create thumbnail for file and returns new imbuf for thumbnail */
-ImBuf* IMB_thumb_create(const char* path, ThumbSize size, ThumbSource source);
+ImBuf* IMB_thumb_create(const char* path, ThumbSize size, ThumbSource source, ImBuf *ibuf);
 
 /* read thumbnail for file and returns new imbuf for thumbnail */
 ImBuf* IMB_thumb_read(const char* path, ThumbSize size);
@@ -70,6 +71,8 @@ ImBuf* IMB_thumb_manage(const char* path, ThumbSize size, ThumbSource source);
 /* create the necessary dirs to store the thumbnails */
 void IMB_thumb_makedirs();
 
+/* special function for loading a thumbnail embedded into a blend file */
+ImBuf *IMB_loadblend_thumb(const char *path);
 
 #endif /* _IMB_THUMBS_H */