1 files changed, 99 insertions, 0 deletions
diff --git a/libs/hwui/renderthread/RenderTask.h b/libs/hwui/renderthread/RenderTask.h
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+++ b/libs/hwui/renderthread/RenderTask.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 RENDERTASK_H_
+#define RENDERTASK_H_
+
+#include <cutils/compiler.h>
+#include <utils/Timers.h>
+
+namespace android {
+class Mutex;
+class Condition;
+namespace uirenderer {
+namespace renderthread {
+
+#define METHOD_INVOKE_PAYLOAD_SIZE (8 * sizeof(void*))
+
+/*
+ * Notes about memory management
+ *
+ * RenderThread will only invoke RenderTask::run(). It is the responsibility
+ * of the RenderTask to know if it needs to suicide at the end of run() or
+ * if some other lifecycle is being used. As such, it is not valid to reference
+ * anything on RenderTask after the first call to run().
+ *
+ * For example SignalingRenderTask
+ * is expected to be stack allocated by the calling thread, so it does not
+ * suicide in run() but instead relies on the caller to destroy it.
+ *
+ * MethodInvokeRenderTask however is currently allocated with new, so it will
+ * suicide at the end of run(). TODO: Replace this with a small pool to avoid
+ * malloc/free churn of small objects?
+ */
+
+class ANDROID_API RenderTask {
+public:
+    ANDROID_API RenderTask() : mNext(0), mRunAt(0) {}
+    ANDROID_API virtual ~RenderTask() {}
+
+    ANDROID_API virtual void run() = 0;
+
+    RenderTask* mNext;
+    nsecs_t mRunAt; // nano-seconds on the SYSTEM_TIME_MONOTONIC clock
+};
+
+class SignalingRenderTask : public RenderTask {
+public:
+    // Takes ownership of task, caller owns lock and signal
+    SignalingRenderTask(RenderTask* task, Mutex* lock, Condition* signal)
+            : mTask(task), mLock(lock), mSignal(signal) {}
+    virtual void run();
+
+private:
+    RenderTask* mTask;
+    Mutex* mLock;
+    Condition* mSignal;
+};
+
+typedef void* (*RunnableMethod)(void* data);
+
+class MethodInvokeRenderTask : public RenderTask {
+public:
+    MethodInvokeRenderTask(RunnableMethod method)
+        : mMethod(method), mReturnPtr(0) {}
+
+    void* payload() { return mData; }
+    void setReturnPtr(void** retptr) { mReturnPtr = retptr; }
+
+    virtual void run() {
+        void* retval = mMethod(mData);
+        if (mReturnPtr) {
+            *mReturnPtr = retval;
+        }
+        // Commit suicide
+        delete this;
+    }
+private:
+    RunnableMethod mMethod;
+    char mData[METHOD_INVOKE_PAYLOAD_SIZE];
+    void** mReturnPtr;
+};
+
+} /* namespace renderthread */
+} /* namespace uirenderer */
+} /* namespace android */
+#endif /* RENDERTASK_H_ */