From c0739bfa0c3c67f635b5fbe9c84275291a465051 Mon Sep 17 00:00:00 2001
From: Young Hahn <young@developmentseed.org>
Date: Wed, 25 Jan 2012 00:09:03 -0500
Subject: [PATCH] Allow tilelive to pass in tile id. Prepares for delegation of
 dupe/id detection entirely to tilelive.

---
 lib/mbtiles.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/mbtiles.js b/lib/mbtiles.js
index 0902cf0..b93ff8e 100644
--- a/lib/mbtiles.js
+++ b/lib/mbtiles.js
@@ -529,7 +529,11 @@ MBTiles.prototype.putTile = function(z, x, y, data, callback) {
     // Flip Y coordinate because MBTiles files are TMS.
     y = (1 << z) - 1 - y;
 
-    var id = crypto.createHash('md5').update(data).digest('hex');
+    // Allow tilelive to pass us a data.id. If not, generate an md5
+    // from the image buffer data.
+    // @TODO refactor this such that it is entirely tilelive's responsibility
+    // to assign an ID to tiles and identify blanks. We're halfway there.
+    var id = data.id || crypto.createHash('md5').update(data).digest('hex');
     if (!this._tileCache[id]) {
         // This corresponds to the images table.
         this._tileCache[id] = data;