SurfaceFlinger: add setAllowedDisplayConfigs
Add an API to ISurfaceComposer to set allowed display configurations.
This API is expected to be called by DisplayManager depends on the
current policy in place. Once setAllowedDisplayConfigs is called,
SF can only set a new display config if it is part of the allowed
configurations list.
Test: call setAllowedDisplayConfigs() from backdoor and
observe config change.
Bug: 122905403
Change-Id: I1d0a3649bbe7a08efeb72dc270f0b2df330b021c
diff --git a/services/surfaceflinger/AllowedDisplayConfigs.h b/services/surfaceflinger/AllowedDisplayConfigs.h
new file mode 100644
index 0000000..e3b9c1f
--- /dev/null
+++ b/services/surfaceflinger/AllowedDisplayConfigs.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2019 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.
+ */
+
+#pragma once
+
+#include <log/log.h>
+#include <vector>
+
+/*
+ * Used to represent the Display Configurations allowed to be set by SurfaceFlinger
+ */
+class AllowedDisplayConfigs {
+private:
+ // Defining ConstructorTag as private to prevent instantiating this class from outside
+ // while still allowing it to be constructed by std::make_unique
+ struct ConstructorTag {};
+
+public:
+ AllowedDisplayConfigs(ConstructorTag) {}
+
+ class Builder {
+ public:
+ Builder()
+ : mAllowedDisplayConfigs(std::make_unique<AllowedDisplayConfigs>(ConstructorTag{})) {}
+
+ std::unique_ptr<const AllowedDisplayConfigs> build() {
+ return std::move(mAllowedDisplayConfigs);
+ }
+
+ // add a config to the allowed config set
+ Builder& addConfig(int32_t config) {
+ mAllowedDisplayConfigs->addConfig(config);
+ return *this;
+ }
+
+ private:
+ std::unique_ptr<AllowedDisplayConfigs> mAllowedDisplayConfigs;
+ };
+
+ bool isConfigAllowed(int32_t config) const {
+ return (std::find(mConfigs.begin(), mConfigs.end(), config) != mConfigs.end());
+ }
+
+private:
+ // add a config to the allowed config set
+ void addConfig(int32_t config) { mConfigs.push_back(config); }
+
+ std::vector<int32_t> mConfigs;
+};