Cleanup: use IMB_FTYPE_NONE instead of 0 for imbuf format comparison

Image format code checked the file type against an enum except for
zero which is used when the format can't be detected.

Also add doc-strings to some of the image file type callbacks.

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/blenkernel/intern/packedFile.c b/source/blender/blenkernel/intern/packedFile.c
index e99dd77005b..87239d160b4 100644
--- a/source/blender/blenkernel/intern/packedFile.c
+++ b/source/blender/blenkernel/intern/packedFile.c
@@ -536,8 +536,8 @@ static void unpack_generate_paths(const char *name,
       ImagePackedFile *imapf = ((Image *)id)->packedfiles.last;
       if (imapf != NULL && imapf->packedfile != NULL) {
         const PackedFile *pf = imapf->packedfile;
-        const int ftype = IMB_ispic_type_from_memory((const uchar *)pf->data, pf->size);
-        if (ftype != 0) {
+        enum eImbFileType ftype = IMB_ispic_type_from_memory((const uchar *)pf->data, pf->size);
+        if (ftype != IMB_FTYPE_NONE) {
           const int imtype = BKE_image_ftype_to_imtype(ftype, NULL);
           BKE_image_path_ensure_ext_from_imtype(tempname, imtype);
         }