From 20ba0f49dd41352c47cb50f2650478cbe22bb9e0 Mon Sep 17 00:00:00 2001
From: Lovell Fuller <github@lovell.info>
Date: Thu, 8 Oct 2020 10:05:39 +0100
Subject: [PATCH] Changelog entry and doc refresh for #2397

---
 docs/api-output.md | 3 ++-
 docs/changelog.md  | 4 ++++
 docs/humans.txt    | 3 +++
 lib/output.js      | 8 +++++---
 test/unit/tile.js  | 2 +-
 5 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/docs/api-output.md b/docs/api-output.md
index 083ad80d..aa3ce439 100644
--- a/docs/api-output.md
+++ b/docs/api-output.md
@@ -372,7 +372,8 @@ Warning: multiple sharp instances concurrently producing tile output can expose
     -   `options.skipBlanks` **[number][9]** threshold to skip tile generation, a value 0 - 255 for 8-bit images or 0 - 65535 for 16-bit images (optional, default `-1`)
     -   `options.container` **[string][2]** tile container, with value `fs` (filesystem) or `zip` (compressed file). (optional, default `'fs'`)
     -   `options.layout` **[string][2]** filesystem layout, possible values are `dz`, `iiif`, `zoomify` or `google`. (optional, default `'dz'`)
-    -   `options.centre|center` **[boolean][7]** center image in tile (optional, default `false`)
+    -   `options.centre` **[boolean][7]** centre image in tile. (optional, default `false`)
+    -   `options.center` **[boolean][7]** alternative spelling of centre. (optional, default `false`)
 
 ### Examples
 
diff --git a/docs/changelog.md b/docs/changelog.md
index 82647539..8b5f918a 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -13,6 +13,10 @@ Requires libvips v8.10.0
   [#2379](https://github.com/lovell/sharp/pull/2379)
   [@jalovatt](https://github.com/jalovatt)
 
+* Add centre/center option to tile-based output.
+  [#2397](https://github.com/lovell/sharp/pull/2397)
+  [@beig](https://github.com/beig)
+
 ### v0.26.1 - 20th September 2020
 
 * Ensure correct pageHeight when verifying multi-page image dimensions.
diff --git a/docs/humans.txt b/docs/humans.txt
index 50b7a2f0..43279801 100644
--- a/docs/humans.txt
+++ b/docs/humans.txt
@@ -203,3 +203,6 @@ GitHub: https://github.com/derom
 
 Name: Stefan Probst
 GitHub: https://github.com/stefanprobst
+
+Name: Thomas Beiganz
+GitHub: https://github.com/beig
diff --git a/lib/output.js b/lib/output.js
index 8ec94873..3553ae9f 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -658,7 +658,8 @@ function raw () {
  * @param {number} [options.skipBlanks=-1] threshold to skip tile generation, a value 0 - 255 for 8-bit images or 0 - 65535 for 16-bit images
  * @param {string} [options.container='fs'] tile container, with value `fs` (filesystem) or `zip` (compressed file).
  * @param {string} [options.layout='dz'] filesystem layout, possible values are `dz`, `iiif`, `zoomify` or `google`.
- * @param {boolean} [options.centre=false] center image in tile.
+ * @param {boolean} [options.centre=false] centre image in tile.
+ * @param {boolean} [options.center=false] alternative spelling of centre.
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
@@ -728,8 +729,9 @@ function tile (options) {
       this.options.tileSkipBlanks = 5;
     }
     // Center image in tile
-    if (is.defined(options.centre) || is.defined(options.center)) {
-      this._setBooleanOption('tileCentre', options.centre || options.center);
+    const centre = is.bool(options.center) ? options.center : options.centre;
+    if (is.defined(centre)) {
+      this._setBooleanOption('tileCentre', centre);
     }
   }
   // Format
diff --git a/test/unit/tile.js b/test/unit/tile.js
index 4868a0e6..7fab4e4b 100644
--- a/test/unit/tile.js
+++ b/test/unit/tile.js
@@ -292,7 +292,7 @@ describe('Tile', function () {
   it('Invalid center parameter value fail', function () {
     assert.throws(function () {
       sharp().tile({
-        center: 'true'
+        centre: 'true'
       });
     });
   });