[shotwell] Attach a role to PhotoFileReader

[Jens Georg <jensgeorg src gnome org>]

commit 5873a3c4f46ddf1a3045387876cb20415e267338
Author: Jens Georg <mail jensge org>
Date:   Sun Oct 9 18:24:41 2016 +0200

    Attach a role to PhotoFileReader
    
    Signed-off-by: Jens Georg <mail jensge org>

 src/Photo.vala                   |    1 +
 src/photos/PhotoFileAdapter.vala |   15 +++++++++++++++
 2 files changed, 16 insertions(+), 0 deletions(-)
---
diff --git a/src/Photo.vala b/src/Photo.vala
index 222896f..a718b19 100644
--- a/src/Photo.vala
+++ b/src/Photo.vala
@@ -1258,6 +1258,7 @@ public abstract class Photo : PhotoSource, Dateable {
         if (params.thumbnails != null) {
             PhotoFileReader reader = params.row.master.file_format.create_reader(
                 params.row.master.filepath);
+            reader.set_role (PhotoFileReader.Role.THUMBNAIL);
             try {
                 ThumbnailCache.generate_for_photo(params.thumbnails, reader, params.row.orientation, 
                     params.row.master.dim);
diff --git a/src/photos/PhotoFileAdapter.vala b/src/photos/PhotoFileAdapter.vala
index 644917c..df49edb 100644
--- a/src/photos/PhotoFileAdapter.vala
+++ b/src/photos/PhotoFileAdapter.vala
@@ -57,6 +57,13 @@ public abstract class PhotoFileAdapter {
 //
 
 public abstract class PhotoFileReader : PhotoFileAdapter {
+    public enum Role {
+        DEFAULT,
+        THUMBNAIL
+    }
+
+    PhotoFileReader.Role role = Role.DEFAULT;
+
     protected PhotoFileReader(string filepath, PhotoFileFormat file_format) {
         base (filepath, file_format);
     }
@@ -76,6 +83,14 @@ public abstract class PhotoFileReader : PhotoFileAdapter {
     public virtual Gdk.Pixbuf scaled_read(Dimensions full, Dimensions scaled) throws Error {
         return resize_pixbuf(unscaled_read(), scaled, Gdk.InterpType.BILINEAR);
     }
+
+    public void set_role (PhotoFileReader.Role role) {
+        this.role = role;
+    }
+
+    public PhotoFileReader.Role get_role () {
+        return this.role;
+    }
 }
 
 //