1 files changed, 127 insertions, 0 deletions
diff --git a/libs/hwui/renderthread/RenderThread.h b/libs/hwui/renderthread/RenderThread.h
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+++ b/libs/hwui/renderthread/RenderThread.h
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+/*
+ * Copyright (C) 2013 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 RENDERTHREAD_H_
+#define RENDERTHREAD_H_
+
+#include "RenderTask.h"
+
+#include <memory>
+#include <set>
+
+#include <cutils/compiler.h>
+#include <utils/Looper.h>
+#include <utils/Mutex.h>
+#include <utils/Singleton.h>
+#include <utils/Thread.h>
+
+#include "TimeLord.h"
+
+namespace android {
+class DisplayEventReceiver;
+
+namespace uirenderer {
+namespace renderthread {
+
+class DispatchFrameCallbacks;
+
+class TaskQueue {
+public:
+    TaskQueue();
+
+    RenderTask* next();
+    void queue(RenderTask* task);
+    void queueAtFront(RenderTask* task);
+    RenderTask* peek();
+    void remove(RenderTask* task);
+
+private:
+    RenderTask* mHead;
+    RenderTask* mTail;
+};
+
+// Mimics android.view.Choreographer.FrameCallback
+class IFrameCallback {
+public:
+    virtual void doFrame() = 0;
+
+protected:
+    ~IFrameCallback() {}
+};
+
+class ANDROID_API RenderThread : public Thread, public Singleton<RenderThread> {
+public:
+    // RenderThread takes complete ownership of tasks that are queued
+    // and will delete them after they are run
+    ANDROID_API void queue(RenderTask* task);
+    ANDROID_API void queueAtFront(RenderTask* task);
+    void queueDelayed(RenderTask* task, int delayMs);
+    void remove(RenderTask* task);
+
+    // Mimics android.view.Choreographer
+    void postFrameCallback(IFrameCallback* callback);
+    void removeFrameCallback(IFrameCallback* callback);
+    // If the callback is currently registered, it will be pushed back until
+    // the next vsync. If it is not currently registered this does nothing.
+    void pushBackFrameCallback(IFrameCallback* callback);
+
+    TimeLord& timeLord() { return mTimeLord; }
+
+protected:
+    virtual bool threadLoop();
+
+private:
+    friend class Singleton<RenderThread>;
+    friend class DispatchFrameCallbacks;
+
+    RenderThread();
+    virtual ~RenderThread();
+
+    void initializeDisplayEventReceiver();
+    static int displayEventReceiverCallback(int fd, int events, void* data);
+    void drainDisplayEventQueue(bool skipCallbacks = false);
+    void dispatchFrameCallbacks();
+    void requestVsync();
+
+    // Returns the next task to be run. If this returns NULL nextWakeup is set
+    // to the time to requery for the nextTask to run. mNextWakeup is also
+    // set to this time
+    RenderTask* nextTask(nsecs_t* nextWakeup);
+
+    sp<Looper> mLooper;
+    Mutex mLock;
+
+    nsecs_t mNextWakeup;
+    TaskQueue mQueue;
+
+    DisplayEventReceiver* mDisplayEventReceiver;
+    bool mVsyncRequested;
+    std::set<IFrameCallback*> mFrameCallbacks;
+    // We defer the actual registration of these callbacks until
+    // both mQueue *and* mDisplayEventReceiver have been drained off all
+    // immediate events. This makes sure that we catch the next vsync, not
+    // the previous one
+    std::set<IFrameCallback*> mPendingRegistrationFrameCallbacks;
+    bool mFrameCallbackTaskPending;
+    DispatchFrameCallbacks* mFrameCallbackTask;
+
+    TimeLord mTimeLord;
+};
+
+} /* namespace renderthread */
+} /* namespace uirenderer */
+} /* namespace android */
+#endif /* RENDERTHREAD_H_ */