diff --git a/crawl-ref/source/rltiles/dc-wall.txt b/crawl-ref/source/rltiles/dc-wall.txt
index 49187ce..bd099cc 100644
--- a/crawl-ref/source/rltiles/dc-wall.txt
+++ b/crawl-ref/source/rltiles/dc-wall.txt
@@ -1577,3 +1577,37 @@ shadow_e_top_darker

 %sdir dngn/vaults
 brick_dark_leak WALL_BRICK_DARK_LEAK
+
+#los blend
+%sdir dngn/losblend
+los_blend_edge_1 LOS_BLEND_EDGE
+los_blend_edge_2
+los_blend_edge_3
+los_blend_edge_4
+los_blend_edge_5
+los_blend_edge_6
+los_blend_edge_7
+los_blend_edge_8
+los_blend_edge_9
+los_blend_edge_10
+los_blend_edge_11
+los_blend_edge_12
+los_blend_edge_13
+los_blend_edge_14
+los_blend_edge_15
+
+los_blend_corner_1 LOS_BLEND_CORNER
+los_blend_corner_2
+los_blend_corner_3
+los_blend_corner_4
+los_blend_corner_5
+los_blend_corner_6
+los_blend_corner_7
+los_blend_corner_8
+los_blend_corner_9
+los_blend_corner_10
+los_blend_corner_11
+los_blend_corner_12
+los_blend_corner_13
+los_blend_corner_14
+los_blend_corner_15
diff --git a/crawl-ref/source/tilecell.cc b/crawl-ref/source/tilecell.cc
index 0c9a84e..42cadee 100644
--- a/crawl-ref/source/tilecell.cc
+++ b/crawl-ref/source/tilecell.cc
@@ -476,6 +476,54 @@ static bool _is_seen_slimy_wall(const coord_def& gc)
     return feat == DNGN_SLIMY_WALL;
 }

+static bool _is_visible(const coord_def& gc)
+{
+    if (!map_bounds(gc))
+        return false;
+    return env.map_knowledge(gc).visible();
+}
+
+static void _pack_los_blend(const coord_def &gc, packed_cell *cell)
+{
+    /*
+     * edges:
+     * 1: north, 2: east,  4: south, 8: west
+     * corners:
+     * 1: north-east, 2: south-east, 4: south-west, 8: north-west
+     */
+     if (!_is_visible(coord_def(gc.x, gc.y)))
+        return;
+
+    int edges = 0;
+    int corners = 0;
+
+    // orthogonals
+    if (!_is_visible(coord_def(gc.x, gc.y - 1)))
+        edges |= 1;
+    if (!_is_visible(coord_def(gc.x + 1, gc.y)))
+        edges |= 2;
+    if (!_is_visible(coord_def(gc.x, gc.y + 1)))
+        edges |= 4;
+    if (!_is_visible(coord_def(gc.x - 1, gc.y)))
+        edges |= 8;
+
+    if (edges)
+        _add_overlay(TILE_LOS_BLEND_EDGE + edges - 1, cell);
+
+    // corners
+    if (!(edges & 1) && !(edges & 2) && !_is_visible(coord_def(gc.x + 1, gc.y - 1)))
+        corners |= 1;
+    if (!(edges & 2) && !(edges & 4) && !_is_visible(coord_def(gc.x + 1, gc.y + 1)))
+        corners |= 2;
+    if (!(edges & 4) && !(edges & 8) && !_is_visible(coord_def(gc.x - 1, gc.y + 1)))
+        corners |= 4;
+    if (!(edges & 1) && !(edges & 8) && !_is_visible(coord_def(gc.x - 1, gc.y - 1)))
+        corners |= 8;
+
+    if (corners)
+        _add_overlay(TILE_LOS_BLEND_CORNER + corners - 1, cell);
+}
+
 void pack_cell_overlays(const coord_def &gc, packed_cell *cell)
 {
     if (env.map_knowledge(gc).feat() == DNGN_UNSEEN)
@@ -499,4 +547,6 @@ void pack_cell_overlays(const coord_def &gc, packed_cell *cell)
             shadow_tile = TILE_DNGN_WALL_SHADOW_DARK;
         _pack_wall_shadows(gc, cell, shadow_tile);
     }
+
+    _pack_los_blend(gc, cell);
 }