HDR info listener

Bug: 182312559
Test: SilkFX listener is called

Change-Id: I2c93f6ab51263a905c17a7afabb845317d33419d

1 files changed, 102 insertions, 0 deletions

diff --git a/core/java/android/view/SurfaceControlHdrLayerInfoListener.java b/core/java/android/view/SurfaceControlHdrLayerInfoListener.java
new file mode 100644
index 000000000000..13d68d021e31
--- /dev/null
+++ b/core/java/android/view/SurfaceControlHdrLayerInfoListener.java
@@ -0,0 +1,102 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.view;
+
+import android.annotation.RequiresPermission;
+import android.os.IBinder;
+import android.util.ArrayMap;
+
+import libcore.util.NativeAllocationRegistry;
+
+import java.util.Objects;
+
+/**
+ * Allows for the monitoring of layers with HDR content
+ *
+ * @hide */
+public abstract class SurfaceControlHdrLayerInfoListener {
+    private static final NativeAllocationRegistry sRegistry =
+            NativeAllocationRegistry.createMalloced(
+                    SurfaceControlHdrLayerInfoListener.class.getClassLoader(), nGetDestructor());
+
+    /**
+     * Callback when the HDR information about the given display has changed
+     *
+     * @param displayToken The display this callback is about
+     * @param numberOfHdrLayers How many HDR layers are visible on the display
+     * @param maxW The width of the HDR layer with the largest area
+     * @param maxH The height of the HDR layer with the largest area
+     * @param flags Additional metadata flags, currently always 0
+     *              TODO(b/182312559): Add some flags
+     *
+     * @hide */
+    public abstract void onHdrInfoChanged(IBinder displayToken, int numberOfHdrLayers,
+            int maxW, int maxH, int flags);
+
+    /**
+     * Registers this as an HDR info listener on the provided display
+     * @param displayToken
+     */
+    @RequiresPermission(android.Manifest.permission.CONTROL_DISPLAY_BRIGHTNESS)
+    public void register(IBinder displayToken) {
+        Objects.requireNonNull(displayToken);
+        synchronized (this) {
+            if (mRegisteredListeners.containsKey(displayToken)) {
+                return;
+            }
+            long nativePtr = nRegister(displayToken);
+            Runnable destructor = sRegistry.registerNativeAllocation(this, nativePtr);
+            mRegisteredListeners.put(displayToken, destructor);
+        }
+    }
+
+    /**
+     * Unregisters this as an HDR info listener on the provided display
+     * @param displayToken
+     */
+    @RequiresPermission(android.Manifest.permission.CONTROL_DISPLAY_BRIGHTNESS)
+    public void unregister(IBinder displayToken) {
+        Objects.requireNonNull(displayToken);
+        final Runnable destructor;
+        synchronized (this) {
+            destructor = mRegisteredListeners.remove(displayToken);
+        }
+        if (destructor != null) {
+            destructor.run();
+        }
+    }
+
+    /**
+     * Unregisters this on all previously registered displays
+     */
+    @RequiresPermission(android.Manifest.permission.CONTROL_DISPLAY_BRIGHTNESS)
+    public void unregisterAll() {
+        final ArrayMap<IBinder, Runnable> toDestroy;
+        synchronized (this) {
+            toDestroy = mRegisteredListeners;
+            mRegisteredListeners = new ArrayMap<>();
+        }
+        for (Runnable destructor : toDestroy.values()) {
+            destructor.run();
+        }
+    }
+
+    private ArrayMap<IBinder, Runnable> mRegisteredListeners = new ArrayMap<>();
+
+    private static native long nGetDestructor();
+    private native long nRegister(IBinder displayToken);
+}