From 4fa37704113518404084adbf15f1fdf350b42060 Mon Sep 17 00:00:00 2001
From: "Sergey \"Shnatsel\" Davidoff" <sdavydov@google.com>
Date: Mon, 2 Jan 2023 15:35:53 +0100
Subject: [PATCH 1/2] Implement size hints for FlatSampleIterator

---
 src/image/mod.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/image/mod.rs b/src/image/mod.rs
index 43a59c9a..2f76441a 100644
--- a/src/image/mod.rs
+++ b/src/image/mod.rs
@@ -530,8 +530,14 @@ impl Iterator for FlatSampleIterator<'_> {
         }
         else { None }
     }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        let remaining = self.layer.channel_data.list.len() - self.channel_index;
+        (remaining, Some(remaining))
+    }
 }
 
+impl ExactSizeIterator for FlatSampleIterator<'_> {}
 
 impl<SampleData> AnyChannels<SampleData>{
 

From 0aa407e667177bb391c2ebd0f85db59d04f5b29a Mon Sep 17 00:00:00 2001
From: "Sergey \"Shnatsel\" Davidoff" <sdavydov@google.com>
Date: Mon, 2 Jan 2023 16:05:38 +0100
Subject: [PATCH 2/2] Also implement nth()

---
 src/image/mod.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/image/mod.rs b/src/image/mod.rs
index 2f76441a..a6153db6 100644
--- a/src/image/mod.rs
+++ b/src/image/mod.rs
@@ -531,8 +531,13 @@ impl Iterator for FlatSampleIterator<'_> {
         else { None }
     }
 
+    fn nth(&mut self, pos: usize) -> Option<Self::Item> {
+        self.channel_index += pos;
+        self.next()
+    }
+
     fn size_hint(&self) -> (usize, Option<usize>) {
-        let remaining = self.layer.channel_data.list.len() - self.channel_index;
+        let remaining = self.layer.channel_data.list.len().saturating_sub(self.channel_index);
         (remaining, Some(remaining))
     }
 }