From ab8ed4e1e205d50985bd706f66c2384bb47a4d51 Mon Sep 17 00:00:00 2001
From: Nicolas Silva <nical@fastmail.com>
Date: Tue, 30 Oct 2018 17:01:23 +0100
Subject: [PATCH] Properly evict cached blob tiles when they are out of the
 visible area.

---
 webrender/src/resource_cache.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/webrender/src/resource_cache.rs b/webrender/src/resource_cache.rs
index 908956be64..5269afb627 100644
--- a/webrender/src/resource_cache.rs
+++ b/webrender/src/resource_cache.rs
@@ -1202,6 +1202,20 @@ impl ResourceCache {
         );
 
         tiles.retain(|tile, _| { tile_range.contains(tile) });
+
+        let texture_cache = &mut self.texture_cache;
+        match self.cached_images.try_get_mut(&key) {
+            Some(&mut ImageResult::Multi(ref mut entries)) => {
+                entries.retain(|key, entry| {
+                    if key.tile.is_none() || tile_range.contains(&key.tile.unwrap()) {
+                        return true;
+                    }
+                    texture_cache.mark_unused(&entry.texture_cache_handle);
+                    return false;
+                });
+            }
+            _ => {}
+        }
     }
 
     pub fn request_glyphs(