1 files changed, 89 insertions, 0 deletions
diff --git a/drm/DrmAtomicStateManager.h b/drm/DrmAtomicStateManager.h
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+++ b/drm/DrmAtomicStateManager.h
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+/*
+ * 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_