upload android base code part4

android/hardware/qcom/display/msm8909/libhwcomposer/hwc_virtual.h

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+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ * Copyright (C) 2012-2014, The Linux Foundation. All rights reserved.
+ *
+ * Not a Contribution, Apache license notifications and license are retained
+ * for attribution purposes only.
+ *
+ * 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 HWC_VIRTUAL
+#define HWC_VIRTUAL
+
+#include <hwc_utils.h>
+
+namespace qhwc {
+
+class HWCVirtualVDS {
+public:
+    HWCVirtualVDS(){};
+    ~HWCVirtualVDS(){};
+    // Chooses composition type and configures pipe for each layer in virtual
+    // display list
+    int prepare(hwc_composer_device_1 *dev,
+                          hwc_display_contents_1_t* list);
+    // Queues the buffer for each layer in virtual display list and call display
+    // commit.
+    int set(hwc_context_t *ctx, hwc_display_contents_1_t *list);
+    // instantiates mdpcomp, copybit and fbupdate objects and initialize those
+    // objects for virtual display during virtual display connect.
+    void init(hwc_context_t *ctx);
+    // Destroys mdpcomp, copybit and fbupdate objects and for virtual display
+    // during virtual display disconnect.
+    void destroy(hwc_context_t *ctx, size_t numDisplays,
+                       hwc_display_contents_1_t** displays);
+    int getScalingHeight() const { return mScalingHeight; };
+    int getScalingWidth() const { return mScalingWidth; };
+    // We can dump the frame buffer and WB
+    // output buffer by dynamically enabling
+    // dumping via a binder call:
+    // adb shell service call display.qservice 15 i32 3 i32 1
+    static bool sVDDumpEnabled;
+    static void dynamicDebug(bool enable) {sVDDumpEnabled = enable;};
+
+private:
+    // These variables store the resolution that WB is being configured to
+    // in the current draw cycle.
+    int mScalingWidth, mScalingHeight;
+    void setMDPScalingMode(hwc_context_t* ctx,
+            private_handle_t* ohnd, int dpy);
+};
+
+}; //namespace
+#endif