drm_hwcomposer: support virtual displays
Virtual display support is mandatory for HWC version 1.4.
As a minimal implementation, we use frambuffer target and let SF take care of
GLES composition. We still need to handle the acquire and release fences for
both the virtual display and all layers in a separate worker thread.
BUG=24609829
TEST=screen casting to chromecast
Change-Id: Idb962f4b5bb852c9ec9ebcaa1679a653c01737fb
diff --git a/virtualcompositorworker.h b/virtualcompositorworker.h
new file mode 100644
index 0000000..4a15f0c
--- /dev/null
+++ b/virtualcompositorworker.h
@@ -0,0 +1,56 @@
+/*
+ * 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_VIRTUAL_COMPOSITOR_WORKER_H_
+#define ANDROID_VIRTUAL_COMPOSITOR_WORKER_H_
+
+#include "drm_hwcomposer.h"
+#include "worker.h"
+
+#include <queue>
+
+namespace android {
+
+class VirtualCompositorWorker : public Worker {
+ public:
+ VirtualCompositorWorker();
+ ~VirtualCompositorWorker();
+
+ int Init();
+ void QueueComposite(hwc_display_contents_1_t *dc);
+
+ protected:
+ virtual void Routine();
+
+ private:
+ struct VirtualComposition {
+ UniqueFd outbuf_acquire_fence;
+ std::vector<UniqueFd> layer_acquire_fences;
+ int release_timeline;
+ };
+
+ int CreateNextTimelineFence();
+ int FinishComposition(int timeline);
+ void Compose(std::unique_ptr<VirtualComposition> composition);
+
+ std::queue<std::unique_ptr<VirtualComposition>> composite_queue_;
+ int timeline_fd_;
+ int timeline_;
+ int timeline_current_;
+};
+}
+
+#endif