drm_hwcomposer: Add composition skipping backend

This display backend may be chosen by setting the hwc.backend_override
system property to the "client" value.

Suggested-by: Andrii Chepurnyi <andrii_chepurnyi@epam.com>
Signed-off-by: Matvii Zorin <matvii.zorin@globallogic.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/include/backendclient.h b/include/backendclient.h
new file mode 100644
index 0000000..361160f
--- /dev/null
+++ b/include/backendclient.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+#ifndef ANDROID_BACKEND_CLIENT_H
+#define ANDROID_BACKEND_CLIENT_H
+
+#include "backend.h"
+#include "drmhwctwo.h"
+
+namespace android {
+
+class BackendClient : public Backend {
+ public:
+  HWC2::Error ValidateDisplay(DrmHwcTwo::HwcDisplay *display,
+                              uint32_t *num_types,
+                              uint32_t *num_requests) override;
+};
+}  // namespace android
+
+#endif