Make vendor keys visible in Camera2 java APIs.

- Add vendor keys to getKeys() calls for CameraCharacteristics,
  CaptureRequest, and CaptureResult.
- Vendors can specify whether custom keys show up by listing
  visible keys in the REQUEST_AVAILABLE_RESULT_KEYS field.
- Vendor key types are always treated as a primitive (or Rational)
  array type corresponding to one of the valid types for
  a camera metadata entry.

Bug: 22067625
Change-Id: I6e7dd3db7a8bf533c2ec15ff69ca38824134e971

2 files changed, 36 insertions, 0 deletions

diff --git a/core/java/android/hardware/camera2/CameraMetadata.java b/core/java/android/hardware/camera2/CameraMetadata.java
index af1367c..c580083 100644
--- a/core/java/android/hardware/camera2/CameraMetadata.java
+++ b/core/java/android/hardware/camera2/CameraMetadata.java
@@ -173,6 +173,28 @@ public abstract class CameraMetadata<TKey> {
             }
         }
 
+        ArrayList<TKey> vendorKeys = CameraMetadataNative.getAllVendorKeys(keyClass);
+
+        if (vendorKeys != null) {
+            for (TKey k : vendorKeys) {
+                String keyName;
+                if (k instanceof CaptureRequest.Key<?>) {
+                    keyName = ((CaptureRequest.Key<?>) k).getName();
+                } else if (k instanceof CaptureResult.Key<?>) {
+                    keyName = ((CaptureResult.Key<?>) k).getName();
+                } else if (k instanceof CameraCharacteristics.Key<?>) {
+                    keyName = ((CameraCharacteristics.Key<?>) k).getName();
+                } else {
+                    continue;
+                }
+
+                if (filterTags == null || Arrays.binarySearch(filterTags,
+                        CameraMetadataNative.getTag(keyName)) >= 0) {
+                    keyList.add(k);
+                }
+            }
+        }
+
         return keyList;
     }
 
diff --git a/core/java/android/hardware/camera2/impl/CameraMetadataNative.java b/core/java/android/hardware/camera2/impl/CameraMetadataNative.java
index 7e50fd9..12a2910 100644
--- a/core/java/android/hardware/camera2/impl/CameraMetadataNative.java
+++ b/core/java/android/hardware/camera2/impl/CameraMetadataNative.java
@@ -1078,6 +1078,7 @@ public class CameraMetadataNative implements Parcelable {
     private native synchronized void nativeWriteValues(int tag, byte[] src);
     private native synchronized void nativeDump() throws IOException; // dump to ALOGD
 
+    private static native ArrayList nativeGetAllVendorKeys(Class keyClass);
     private static native int nativeGetTagFromKey(String keyName)
             throws IllegalArgumentException;
     private static native int nativeGetTypeFromTag(int tag)
@@ -1113,6 +1114,19 @@ public class CameraMetadataNative implements Parcelable {
         return nativeIsEmpty();
     }
 
+
+    /**
+     * Return a list containing keys of the given key class for all defined vendor tags.
+     *
+     * @hide
+     */
+    public static <K> ArrayList<K> getAllVendorKeys(Class<K> keyClass) {
+        if (keyClass == null) {
+            throw new NullPointerException();
+        }
+        return (ArrayList<K>) nativeGetAllVendorKeys(keyClass);
+    }
+
     /**
      * Convert a key string into the equivalent native tag.
      *