From aa1bbcb5c1b871c5d862c66f4cdf1c8dd985c1ed Mon Sep 17 00:00:00 2001
From: Lovell Fuller <github@lovell.info>
Date: Thu, 21 Mar 2024 18:33:57 +0000
Subject: [PATCH] Guard heif bitdepth property for prebuilt binaries

---
 lib/output.js     | 4 ++++
 test/unit/heif.js | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/lib/output.js b/lib/output.js
index c03d6506a..d7b071210 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -1011,6 +1011,7 @@ function tiff (options) {
  * Use these AVIF options for output image.
  *
  * AVIF image sequences are not supported.
+ * Prebuilt binaries support a bitdepth of 8 only.
  *
  * @example
  * const data = await sharp(input)
@@ -1097,6 +1098,9 @@ function heif (options) {
     }
     if (is.defined(options.bitdepth)) {
       if (is.integer(options.bitdepth) && is.inArray(options.bitdepth, [8, 10, 12])) {
+        if (options.bitdepth !== 8 && this.constructor.versions.heif) {
+          throw is.invalidParameterError('bitdepth when using prebuilt binaries', 8, options.bitdepth);
+        }
         this.options.heifBitdepth = options.bitdepth;
       } else {
         throw is.invalidParameterError('bitdepth', '8, 10 or 12', options.bitdepth);
diff --git a/test/unit/heif.js b/test/unit/heif.js
index ccd6a3992..be304b3dd 100644
--- a/test/unit/heif.js
+++ b/test/unit/heif.js
@@ -79,9 +79,16 @@ describe('HEIF', () => {
     });
   });
   it('valid bitdepth value does not throw an error', () => {
+    const { heif } = sharp.versions;
+    delete sharp.versions.heif;
     assert.doesNotThrow(() => {
       sharp().heif({ compression: 'av1', bitdepth: 12 });
     });
+    sharp.versions.heif = '1.2.3';
+    assert.throws(() => {
+      sharp().heif({ compression: 'av1', bitdepth: 10 });
+    }, /Error: Expected 8 for bitdepth when using prebuilt binaries but received 10 of type number/);
+    sharp.versions.heif = heif;
   });
   it('invalid bitdepth value should throw an error', () => {
     assert.throws(() => {