Use a gopher as default avatar (rather than the gravatar logo) (#3208)

Also changes the avatar from a jpeg to a png, to allow for
transparent background. The indexed png is also smaller in size.

Note that at the moment the default avatar is only used when
the user requested a custom avatar and the custom avatar file
is not found (should never happen).

In the future the default avatar could be used as a default
return when by-mail avatar lookups fail too (both gravatar
and libravatar support passing a default)

4 files changed, 2 insertions, 2 deletions

diff --git a/models/user.go b/models/user.go
index e6717aecdf..f4c5b669c2 100644
--- a/models/user.go
+++ b/models/user.go
@@ -240,7 +240,7 @@ func (u *User) GenerateRandomAvatar() error {
 }
 
 func (u *User) RelAvatarLink() string {
-	defaultImgUrl := "/img/avatar_default.jpg"
+	defaultImgUrl := "/img/avatar_default.png"
 	if u.Id == -1 {
 		return defaultImgUrl
 	}
diff --git a/modules/base/tool.go b/modules/base/tool.go
index 22a90daff7..f045cb2270 100644
--- a/modules/base/tool.go
+++ b/modules/base/tool.go
@@ -207,7 +207,7 @@ func HashEmail(email string) string {
 // AvatarLink returns avatar link by given email.
 func AvatarLink(email string) string {
 	if setting.DisableGravatar || setting.OfflineMode {
-		return setting.AppSubUrl + "/img/avatar_default.jpg"
+		return setting.AppSubUrl + "/img/avatar_default.png"
 	}
 
 	return setting.GravatarSource + HashEmail(email)
diff --git a/public/img/avatar_default.jpg b/public/img/avatar_default.jpg
deleted file mode 100644
index f97aaaf041..0000000000
--- a/public/img/avatar_default.jpg
+++ /dev/null
diff --git a/public/img/avatar_default.png b/public/img/avatar_default.png
new file mode 100644
index 0000000000..fed568a12b
--- /dev/null
+++ b/public/img/avatar_default.png