drm_hwcomposer: Rename DrmDisplayCompositor->DrmAtomicStateManager

Primary responsibilities of this class are:

1. Send composition/mode/active state over DRM atomic commit IOCTL
   to the kernel
2. Track commit state and keep planes owned by the Pipeline while they
   are either displayed or staged for displaying.
3. Keep framebuffers alive while they are in use or staged.

Not much related to composition itself, therefore rename it to
DrmAtomicStateManager and move it to drm folder.

Bump clang-tidy level of DrmAtomicStateManager.c to normal by fixing
minor clang-tidy findings.

Signed-off-by: Roman Stratiienko <roman.o.stratiienko@globallogic.com>

1 files changed, 89 insertions, 0 deletions

diff --git a/drm/DrmAtomicStateManager.h b/drm/DrmAtomicStateManager.h
new file mode 100644
index 0000000..08a1c13
--- /dev/null
+++ b/drm/DrmAtomicStateManager.h
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2015 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_DRM_ATOMIC_STATE_MANAGER_H_
+#define ANDROID_DRM_ATOMIC_STATE_MANAGER_H_
+
+#include <pthread.h>
+
+#include <functional>
+#include <memory>
+#include <optional>
+#include <sstream>
+#include <tuple>
+
+#include "compositor/DrmKmsPlan.h"
+#include "drm/DrmPlane.h"
+#include "drm/ResourceManager.h"
+#include "drm/VSyncWorker.h"
+#include "drmhwcomposer.h"
+
+namespace android {
+
+struct AtomicCommitArgs {
+  /* inputs. All fields are optional, but at least one has to be specified */
+  bool test_only = false;
+  std::optional<DrmMode> display_mode;
+  std::optional<bool> active;
+  std::shared_ptr<DrmKmsPlan> composition;
+
+  /* out */
+  UniqueFd out_fence;
+
+  /* helpers */
+  auto HasInputs() -> bool {
+    return display_mode || active || composition;
+  }
+};
+
+class DrmAtomicStateManager {
+ public:
+  explicit DrmAtomicStateManager(DrmDisplayPipeline *pipe) : pipe_(pipe){};
+  DrmAtomicStateManager(const DrmAtomicStateManager &) = delete;
+  ~DrmAtomicStateManager() = default;
+
+  auto ExecuteAtomicCommit(AtomicCommitArgs &args) -> int;
+  auto ActivateDisplayUsingDPMS() -> int;
+
+ private:
+  auto CommitFrame(AtomicCommitArgs &args) -> int;
+
+  struct KmsState {
+    /* Required to cleanup unused planes */
+    std::vector<std::shared_ptr<BindingOwner<DrmPlane>>> used_planes;
+    /* We have to hold a reference to framebuffer while displaying it ,
+     * otherwise picture will blink */
+    std::vector<std::shared_ptr<DrmFbIdHandle>> used_framebuffers;
+
+    DrmModeUserPropertyBlobUnique mode_blob;
+
+    /* To avoid setting the inactive state twice, which will fail the commit */
+    bool crtc_active_state{};
+  } active_frame_state_;
+
+  auto NewFrameState() -> KmsState {
+    return (KmsState){
+        .used_planes = active_frame_state_.used_planes,
+        .used_framebuffers = active_frame_state_.used_framebuffers,
+        .crtc_active_state = active_frame_state_.crtc_active_state,
+    };
+  }
+
+  DrmDisplayPipeline *const pipe_;
+};
+}  // namespace android
+
+#endif  // ANDROID_DRM_DISPLAY_COMPOSITOR_H_