Ensure composite can tile with outside resize #3227

docs/changelog.md

@@ -4,6 +4,11 @@
 
 Requires libvips v8.12.2
 
+### v0.30.7 - TBD
+
+* Ensure tiled composition always works with outside resizing.
+  [#3227](https://github.com/lovell/sharp/issues/3227)
+
 ### v0.30.6 - 30th May 2022
 
 * Allow values for `limitInputPixels` larger than 32-bit.

src/pipeline.cc

@@ -607,14 +607,14 @@ class PipelineWorker : public Napi::AsyncWorker {
             int across = 0;
             int down = 0;
             // Use gravity in overlay
-            if (compositeImage.width() <= baton->width) {
+            if (compositeImage.width() <= image.width()) {
               across = static_cast<int>(ceil(static_cast<double>(image.width()) / compositeImage.width()));
               // Ensure odd number of tiles across when gravity is centre, north or south
               if (composite->gravity == 0 || composite->gravity == 1 || composite->gravity == 3) {
                 across |= 1;
               }
             }
-            if (compositeImage.height() <= baton->height) {
+            if (compositeImage.height() <= image.height()) {
               down = static_cast<int>(ceil(static_cast<double>(image.height()) / compositeImage.height()));
               // Ensure odd number of tiles down when gravity is centre, east or west
               if (composite->gravity == 0 || composite->gravity == 2 || composite->gravity == 4) {

test/unit/composite.js

@@ -420,4 +420,31 @@ describe('composite', () => {
 
     assert.deepStrictEqual(red, { r, g, b });
   });
+
+  it('Ensure tiled composition works with resized fit=outside', async () => {
+    const { info } = await sharp({
+      create: {
+        width: 41, height: 41, channels: 3, background: 'red'
+      }
+    })
+      .resize({
+        width: 10,
+        height: 40,
+        fit: 'outside'
+      })
+      .composite([
+        {
+          input: {
+            create: {
+              width: 16, height: 16, channels: 3, background: 'green'
+            }
+          },
+          tile: true
+        }
+      ])
+      .toBuffer({ resolveWithObject: true });
+
+    assert.strictEqual(info.width, 40);
+    assert.strictEqual(info.height, 40);
+  });
 });