SF: Carve out LayerHandle
Move LayerHandle outside of layer so it can
be used with the new LayerLifecycleManager.
Make Handle fields like layer private and provide
access functions so callers have to safely cast
from a binder instead of directly casting it.
Add layerid to LayerHandle since we want to
expose the layer class in fewer places.
Finally fold LayerCleaner class into LayerHandler.
Bug: 238781169
Test: presubmit
Change-Id: I86e08050cfcc89d68e6ed8fa0e8ff30063cf3603
diff --git a/services/surfaceflinger/FrontEnd/LayerHandle.cpp b/services/surfaceflinger/FrontEnd/LayerHandle.cpp
new file mode 100644
index 0000000..75e4e3a
--- /dev/null
+++ b/services/surfaceflinger/FrontEnd/LayerHandle.cpp
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2022 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.
+ */
+
+#include "LayerHandle.h"
+#include <cstdint>
+#include "Layer.h"
+#include "LayerCreationArgs.h"
+#include "SurfaceFlinger.h"
+
+namespace android::surfaceflinger {
+
+LayerHandle::LayerHandle(const sp<android::SurfaceFlinger>& flinger,
+ const sp<android::Layer>& layer)
+ : mFlinger(flinger), mLayer(layer), mLayerId(static_cast<uint32_t>(layer->getSequence())) {}
+
+LayerHandle::~LayerHandle() {
+ if (mFlinger) {
+ mFlinger->onHandleDestroyed(this, mLayer, mLayerId);
+ }
+}
+
+const String16 LayerHandle::kDescriptor = String16("android.Layer.LayerHandle");
+
+sp<LayerHandle> LayerHandle::fromIBinder(const sp<IBinder>& binder) {
+ if (binder == nullptr) {
+ return nullptr;
+ }
+
+ BBinder* b = binder->localBinder();
+ if (b == nullptr || b->getInterfaceDescriptor() != LayerHandle::kDescriptor) {
+ ALOGD("handle does not have a valid descriptor");
+ return nullptr;
+ }
+
+ // We can safely cast this binder since its local and we verified its interface descriptor.
+ return sp<LayerHandle>::cast(binder);
+}
+
+sp<android::Layer> LayerHandle::getLayer(const sp<IBinder>& binder) {
+ sp<LayerHandle> handle = LayerHandle::fromIBinder(binder);
+ return handle ? handle->mLayer : nullptr;
+}
+
+uint32_t LayerHandle::getLayerId(const sp<IBinder>& binder) {
+ sp<LayerHandle> handle = LayerHandle::fromIBinder(binder);
+ return handle ? handle->mLayerId : UNASSIGNED_LAYER_ID;
+}
+
+} // namespace android::surfaceflinger