diff --git a/libs/hwui/Gainmap.h b/libs/hwui/Gainmap.h
index 765f98a..3bc183a 100644
--- a/libs/hwui/Gainmap.h
+++ b/libs/hwui/Gainmap.h
@@ -27,6 +27,7 @@
 public:
     SkGainmapInfo info;
     sk_sp<Bitmap> bitmap;
+    static sp<Gainmap> allocateHardwareGainmap(const sp<Gainmap>& srcGainmap);
 };
 
 }  // namespace android::uirenderer