drm_hwcomposer: Introduce DrmDisplayPipeline class
Create systematic way of binding DRM objects (Crtc,Encoder,Planes...)
to the pipeline using RAII. Use it to create the pipeline.
+ Allow pipeline creation to fail.
Closes: https://gitlab.freedesktop.org/drm-hwcomposer/drm-hwcomposer/-/issues/14
Signed-off-by: Roman Stratiienko <roman.o.stratiienko@globallogic.com>
diff --git a/drm/DrmDisplayPipeline.h b/drm/DrmDisplayPipeline.h
new file mode 100644
index 0000000..cb5b9e2
--- /dev/null
+++ b/drm/DrmDisplayPipeline.h
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 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.
+ */
+
+#ifndef ANDROID_DRMDISPLAYPIPELINE_H_
+#define ANDROID_DRMDISPLAYPIPELINE_H_
+
+#include <memory>
+#include <vector>
+
+namespace android {
+
+class DrmConnector;
+class DrmDevice;
+class DrmPlane;
+class DrmCrtc;
+class DrmEncoder;
+class DrmDisplayCompositor;
+
+struct DrmDisplayPipeline;
+
+template <class O>
+class BindingOwner;
+
+template <class O>
+class PipelineBindable {
+ friend class BindingOwner<O>;
+
+ public:
+ auto *GetPipeline() {
+ return bound_pipeline_;
+ }
+
+ auto BindPipeline(DrmDisplayPipeline *pipeline,
+ bool return_object_if_bound = false)
+ -> std::shared_ptr<BindingOwner<O>>;
+
+ private:
+ DrmDisplayPipeline *bound_pipeline_;
+ std::weak_ptr<BindingOwner<O>> owner_object_;
+};
+
+template <class B>
+class BindingOwner {
+ public:
+ explicit BindingOwner(B *pb) : bindable_(pb){};
+ ~BindingOwner() {
+ bindable_->bound_pipeline_ = nullptr;
+ }
+
+ B *Get() {
+ return bindable_;
+ }
+
+ private:
+ B *const bindable_;
+};
+
+struct DrmDisplayPipeline {
+ static auto CreatePipeline(DrmConnector &connector)
+ -> std::unique_ptr<DrmDisplayPipeline>;
+
+ DrmDevice *device;
+
+ std::shared_ptr<BindingOwner<DrmConnector>> connector;
+ std::shared_ptr<BindingOwner<DrmEncoder>> encoder;
+ std::shared_ptr<BindingOwner<DrmCrtc>> crtc;
+ std::shared_ptr<BindingOwner<DrmPlane>> primary_plane;
+ std::vector<std::shared_ptr<BindingOwner<DrmPlane>>> overlay_planes;
+};
+
+} // namespace android
+
+#endif