diff --git a/graphics/java/android/graphics/Gainmap.java b/graphics/java/android/graphics/Gainmap.java
index 470a06c1f1f50..a7c508c75ac99 100644
--- a/graphics/java/android/graphics/Gainmap.java
+++ b/graphics/java/android/graphics/Gainmap.java
@@ -96,8 +96,8 @@ public final class Gainmap implements Parcelable {
             throw new RuntimeException("internal error: native gainmap is 0");
         }
 
-        mGainmapContents = gainmapContents;
         mNativePtr = nativeGainmap;
+        setGainmapContents(gainmapContents);
 
         NoImagePreloadHolder.sRegistry.registerNativeAllocation(this, nativeGainmap);
     }
diff --git a/libs/hwui/hwui/Bitmap.cpp b/libs/hwui/hwui/Bitmap.cpp
index cbebae9ed4389..ecf6cfc054448 100644
--- a/libs/hwui/hwui/Bitmap.cpp
+++ b/libs/hwui/hwui/Bitmap.cpp
@@ -464,7 +464,7 @@ bool Bitmap::compress(JavaCompressFormat format, int32_t quality, SkWStream* str
         SkBitmap baseBitmap = getSkBitmap();
         SkBitmap gainmapBitmap = gainmap()->bitmap->getSkBitmap();
         SkJpegEncoder::Options options{.fQuality = quality};
-        return SkJpegGainmapEncoder::EncodeJpegR(stream, baseBitmap.pixmap(), options,
+        return SkJpegGainmapEncoder::EncodeHDRGM(stream, baseBitmap.pixmap(), options,
                                                  gainmapBitmap.pixmap(), options, gainmap()->info);
     }
 #endif
diff --git a/tests/SilkFX/assets/gainmaps/granddam.jpg b/tests/SilkFX/assets/gainmaps/granddam.jpg
new file mode 100644
index 0000000000000..823f14efcbb2a
Binary files /dev/null and b/tests/SilkFX/assets/gainmaps/granddam.jpg differ
diff --git a/tests/SilkFX/assets/gainmaps/lightbulb.jpg b/tests/SilkFX/assets/gainmaps/lightbulb.jpg
new file mode 100644
index 0000000000000..232c5f0937df2
Binary files /dev/null and b/tests/SilkFX/assets/gainmaps/lightbulb.jpg differ
diff --git a/tests/SilkFX/assets/gainmaps/porsche911.jpg b/tests/SilkFX/assets/gainmaps/porsche911.jpg
new file mode 100644
index 0000000000000..50f4fc83910e9
Binary files /dev/null and b/tests/SilkFX/assets/gainmaps/porsche911.jpg differ