[SF] Extract {Display|Layer}RenderArea to separate files

This CL also fixes incorrect sampling bounds in RegionSamplingThread,
caused by ag/11837111.

Bug: 158599281
Test: atest libsurfaceflinger_unittest
Test: take a screenshot from launcher
Test: take a screenshot from YouTube while playing a video
Change-Id: I7e7777071e91a833a7bad4bd77e9d0c989fea9b7
diff --git a/services/surfaceflinger/DisplayRenderArea.h b/services/surfaceflinger/DisplayRenderArea.h
new file mode 100644
index 0000000..340efb5
--- /dev/null
+++ b/services/surfaceflinger/DisplayRenderArea.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2020 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.
+ */
+
+#pragma once
+
+#include <ui/GraphicTypes.h>
+#include <ui/Transform.h>
+
+#include "RenderArea.h"
+
+namespace android {
+
+class DisplayDevice;
+
+class DisplayRenderArea : public RenderArea {
+public:
+    static std::unique_ptr<RenderArea> create(wp<const DisplayDevice>, const Rect& sourceCrop,
+                                              ui::Size reqSize, ui::Dataspace,
+                                              RotationFlags rotation,
+                                              bool allowSecureLayers = true);
+
+    const ui::Transform& getTransform() const override;
+    Rect getBounds() const override;
+    int getHeight() const override;
+    int getWidth() const override;
+    bool isSecure() const override;
+    sp<const DisplayDevice> getDisplayDevice() const override;
+    bool needsFiltering() const override;
+    Rect getSourceCrop() const override;
+
+private:
+    DisplayRenderArea(sp<const DisplayDevice>, const Rect& sourceCrop, ui::Size reqSize,
+                      ui::Dataspace, RotationFlags rotation, bool allowSecureLayers = true);
+
+    const sp<const DisplayDevice> mDisplay;
+    const Rect mSourceCrop;
+    const bool mAllowSecureLayers;
+    const ui::Transform mTransform;
+};
+
+} // namespace android
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