services/surfaceflinger/DisplayDevice.h - android_frameworks_native - Gitiles

 /*
  * Copyright (C) 2007 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_DISPLAY_DEVICE_H
 #define ANDROID_DISPLAY_DEVICE_H

 #include <stdlib.h>

 #include <memory>
 #include <optional>
 #include <string>
 #include <unordered_map>

 #include <android/native_window.h>
 #include <binder/IBinder.h>
 #include <gui/LayerState.h>
 #include <hardware/hwcomposer_defs.h>
 #include <math/mat4.h>
 #include <renderengine/RenderEngine.h>
 #include <system/window.h>
 #include <ui/GraphicTypes.h>
 #include <ui/HdrCapabilities.h>
 #include <ui/Region.h>
 #include <ui/Transform.h>
 #include <utils/Mutex.h>
 #include <utils/RefBase.h>
 #include <utils/Timers.h>

 #include "DisplayHardware/DisplayIdentification.h"
 #include "RenderArea.h"

 namespace android {

 class Fence;
 class HWComposer;
 class IGraphicBufferProducer;
 class Layer;
 class SurfaceFlinger;

 struct CompositionInfo;
 struct DisplayDeviceCreationArgs;
 struct DisplayInfo;

 namespace compositionengine {
 class Display;
 class DisplaySurface;
 } // namespace compositionengine

 class DisplayDevice : public LightRefBase<DisplayDevice> {
 public:
     constexpr static float sDefaultMinLumiance = 0.0;
     constexpr static float sDefaultMaxLumiance = 500.0;

     enum {
         NO_LAYER_STACK = 0xFFFFFFFF,
     };

     explicit DisplayDevice(DisplayDeviceCreationArgs&& args);
     virtual ~DisplayDevice();

     std::shared_ptr<compositionengine::Display> getCompositionDisplay() const {
         return mCompositionDisplay;
     }

     bool isVirtual() const { return mIsVirtual; }
     bool isPrimary() const { return mIsPrimary; }

     // isSecure indicates whether this display can be trusted to display
     // secure surfaces.
     bool isSecure() const;

     int         getWidth() const;
     int         getHeight() const;
     int         getInstallOrientation() const { return mDisplayInstallOrientation; }

     void                    setVisibleLayersSortedByZ(const Vector< sp<Layer> >& layers);
     const Vector< sp<Layer> >& getVisibleLayersSortedByZ() const;
     void                    setLayersNeedingFences(const Vector< sp<Layer> >& layers);
     const Vector< sp<Layer> >& getLayersNeedingFences() const;

     void                    setLayerStack(uint32_t stack);
     void                    setDisplaySize(const int newWidth, const int newHeight);
     void                    setProjection(int orientation, const Rect& viewport, const Rect& frame);

     int                     getOrientation() const { return mOrientation; }
     static uint32_t         getPrimaryDisplayOrientationTransform();
     const ui::Transform& getTransform() const;
     const Rect& getViewport() const;
     const Rect& getFrame() const;
     const Rect& getScissor() const;
     bool needsFiltering() const;
     uint32_t getLayerStack() const;

     const std::optional<DisplayId>& getId() const;
     const wp<IBinder>& getDisplayToken() const { return mDisplayToken; }
     int32_t getSequenceId() const { return mSequenceId; }

     const Region& getUndefinedRegion() const;

     int32_t getSupportedPerFrameMetadata() const;

     bool hasWideColorGamut() const;
     // Whether h/w composer has native support for specific HDR type.
     bool hasHDR10PlusSupport() const;
     bool hasHDR10Support() const;
     bool hasHLGSupport() const;
     bool hasDolbyVisionSupport() const;

     // The returned HdrCapabilities is the combination of HDR capabilities from
     // hardware composer and RenderEngine. When the DisplayDevice supports wide
     // color gamut, RenderEngine is able to simulate HDR support in Display P3
     // color space for both PQ and HLG HDR contents. The minimum and maximum
     // luminance will be set to sDefaultMinLumiance and sDefaultMaxLumiance
     // respectively if hardware composer doesn't return meaningful values.
     const HdrCapabilities& getHdrCapabilities() const;

     // Return true if intent is supported by the display.
     bool hasRenderIntent(ui::RenderIntent intent) const;

     const Rect& getBounds() const;
     const Rect& bounds() const { return getBounds(); }

     void setDisplayName(const std::string& displayName);
     const std::string& getDisplayName() const { return mDisplayName; }

     /* ------------------------------------------------------------------------
      * Display power mode management.
      */
     int getPowerMode() const;
     void setPowerMode(int mode);
     bool isPoweredOn() const;

     ui::Dataspace getCompositionDataSpace() const;

     /* ------------------------------------------------------------------------
      * Display active config management.
      */
     int getActiveConfig() const;
     void setActiveConfig(int mode);

     // release HWC resources (if any) for removable displays
     void disconnect();

     /* ------------------------------------------------------------------------
      * Debugging
      */
     uint32_t getPageFlipCount() const;
     std::string getDebugName() const;
     void dump(std::string& result) const;

 private:
     /*
      *  Constants, set during initialization
      */
     const sp<SurfaceFlinger> mFlinger;
     const wp<IBinder> mDisplayToken;
     const int32_t mSequenceId;

     const int mDisplayInstallOrientation;
     const std::shared_ptr<compositionengine::Display> mCompositionDisplay;

     std::string mDisplayName;
     const bool mIsVirtual;

     /*
      * Can only accessed from the main thread, these members
      * don't need synchronization.
      */

     // list of visible layers on that display
     Vector< sp<Layer> > mVisibleLayersSortedByZ;
     // list of layers needing fences
     Vector< sp<Layer> > mLayersNeedingFences;

     /*
      * Transaction state
      */
     static uint32_t displayStateOrientationToTransformOrientation(int orientation);
     static status_t orientationToTransfrom(int orientation,
                                            int w, int h, ui::Transform* tr);

     int mOrientation;
     static uint32_t sPrimaryDisplayOrientation;

     // Current power mode
     int mPowerMode;
     // Current active config
     int mActiveConfig;

     // TODO(b/74619554): Remove special cases for primary display.
     const bool mIsPrimary;
 };

 struct DisplayDeviceState {
     bool isVirtual() const { return !displayId.has_value(); }

     int32_t sequenceId = sNextSequenceId++;
     std::optional<DisplayId> displayId;
     sp<IGraphicBufferProducer> surface;
     uint32_t layerStack = DisplayDevice::NO_LAYER_STACK;
     Rect viewport;
     Rect frame;
     uint8_t orientation = 0;
     uint32_t width = 0;
     uint32_t height = 0;
     std::string displayName;
     bool isSecure = false;

 private:
     static std::atomic<int32_t> sNextSequenceId;
 };

 struct DisplayDeviceCreationArgs {
     // We use a constructor to ensure some of the values are set, without
     // assuming a default value.
     DisplayDeviceCreationArgs(const sp<SurfaceFlinger>& flinger, const wp<IBinder>& displayToken,
                               const std::optional<DisplayId>& displayId);

     const sp<SurfaceFlinger> flinger;
     const wp<IBinder> displayToken;
     const std::optional<DisplayId> displayId;

     int32_t sequenceId{0};
     bool isVirtual{false};
     bool isSecure{false};
     sp<ANativeWindow> nativeWindow;
     sp<compositionengine::DisplaySurface> displaySurface;
     int displayInstallOrientation{DisplayState::eOrientationDefault};
     bool hasWideColorGamut{false};
     HdrCapabilities hdrCapabilities;
     int32_t supportedPerFrameMetadata{0};
     std::unordered_map<ui::ColorMode, std::vector<ui::RenderIntent>> hwcColorModes;
     int initialPowerMode{HWC_POWER_MODE_NORMAL};
     bool isPrimary{false};
 };

 class DisplayRenderArea : public RenderArea {
 public:
     DisplayRenderArea(const sp<const DisplayDevice> device,
                       ui::Transform::orientation_flags rotation = ui::Transform::ROT_0)
           : DisplayRenderArea(device, device->getBounds(), device->getWidth(), device->getHeight(),
                               device->getCompositionDataSpace(), rotation) {}
     DisplayRenderArea(const sp<const DisplayDevice> device, Rect sourceCrop, uint32_t reqWidth,
                       uint32_t reqHeight, ui::Dataspace reqDataSpace,
                       ui::Transform::orientation_flags rotation, bool allowSecureLayers = true)
           : RenderArea(reqWidth, reqHeight, CaptureFill::OPAQUE, reqDataSpace,
                        getDisplayRotation(rotation, device->getInstallOrientation())),
             mDevice(device),
             mSourceCrop(sourceCrop),
             mAllowSecureLayers(allowSecureLayers) {}

     const ui::Transform& getTransform() const override { return mDevice->getTransform(); }
     Rect getBounds() const override { return mDevice->getBounds(); }
     int getHeight() const override { return mDevice->getHeight(); }
     int getWidth() const override { return mDevice->getWidth(); }
     bool isSecure() const override { return mAllowSecureLayers && mDevice->isSecure(); }
     const sp<const DisplayDevice> getDisplayDevice() const override { return mDevice; }

     bool needsFiltering() const override {
         // check if the projection from the logical display to the physical
         // display needs filtering
         if (mDevice->needsFiltering()) {
             return true;
         }

         // check if the projection from the logical render area (i.e., the
         // physical display) to the physical render area requires filtering
         const Rect sourceCrop = getSourceCrop();
         int width = sourceCrop.width();
         int height = sourceCrop.height();
         if (getRotationFlags() & ui::Transform::ROT_90) {
             std::swap(width, height);
         }
         return width != getReqWidth() || height != getReqHeight();
     }

     Rect getSourceCrop() const override {
         // use the projected display viewport by default.
         if (mSourceCrop.isEmpty()) {
             return mDevice->getScissor();
         }

         // Recompute the device transformation for the source crop.
         ui::Transform rotation;
         ui::Transform translatePhysical;
         ui::Transform translateLogical;
         ui::Transform scale;
         const Rect& viewport = mDevice->getViewport();
         const Rect& scissor = mDevice->getScissor();
         const Rect& frame = mDevice->getFrame();

         const int orientation = mDevice->getInstallOrientation();
         // Install orientation is transparent to the callers.  Apply it now.
         uint32_t flags = 0x00;
         switch (orientation) {
             case DisplayState::eOrientation90:
                 flags = ui::Transform::ROT_90;
                 break;
             case DisplayState::eOrientation180:
                 flags = ui::Transform::ROT_180;
                 break;
             case DisplayState::eOrientation270:
                 flags = ui::Transform::ROT_270;
                 break;
             default:
                 break;
         }
         rotation.set(flags, getWidth(), getHeight());
         translateLogical.set(-viewport.left, -viewport.top);
         translatePhysical.set(scissor.left, scissor.top);
         scale.set(frame.getWidth() / float(viewport.getWidth()), 0, 0,
                   frame.getHeight() / float(viewport.getHeight()));
         const ui::Transform finalTransform =
                 rotation * translatePhysical * scale * translateLogical;
         return finalTransform.transform(mSourceCrop);
     }

 private:
     // Install orientation is transparent to the callers.  We need to cancel
     // it out by modifying rotation flags.
     static ui::Transform::orientation_flags getDisplayRotation(
             ui::Transform::orientation_flags rotation, int orientation) {
         if (orientation == DisplayState::eOrientationDefault) {
             return rotation;
         }

         // convert hw orientation into flag presentation
         // here inverse transform needed
         uint8_t hw_rot_90 = 0x00;
         uint8_t hw_flip_hv = 0x00;
         switch (orientation) {
             case DisplayState::eOrientation90:
                 hw_rot_90 = ui::Transform::ROT_90;
                 hw_flip_hv = ui::Transform::ROT_180;
                 break;
             case DisplayState::eOrientation180:
                 hw_flip_hv = ui::Transform::ROT_180;
                 break;
             case DisplayState::eOrientation270:
                 hw_rot_90 = ui::Transform::ROT_90;
                 break;
         }

         // transform flags operation
         // 1) flip H V if both have ROT_90 flag
         // 2) XOR these flags
         uint8_t rotation_rot_90 = rotation & ui::Transform::ROT_90;
         uint8_t rotation_flip_hv = rotation & ui::Transform::ROT_180;
         if (rotation_rot_90 & hw_rot_90) {
             rotation_flip_hv = (~rotation_flip_hv) & ui::Transform::ROT_180;
         }

         return static_cast<ui::Transform::orientation_flags>(
                 (rotation_rot_90 ^ hw_rot_90) | (rotation_flip_hv ^ hw_flip_hv));
     }

     const sp<const DisplayDevice> mDevice;
     const Rect mSourceCrop;
     const bool mAllowSecureLayers;
 };

 }; // namespace android

 #endif // ANDROID_DISPLAY_DEVICE_H
	/*
	* Copyright (C) 2007 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_DISPLAY_DEVICE_H
	#define ANDROID_DISPLAY_DEVICE_H

	#include <stdlib.h>

	#include <memory>
	#include <optional>
	#include <string>
	#include <unordered_map>

	#include <android/native_window.h>
	#include <binder/IBinder.h>
	#include <gui/LayerState.h>
	#include <hardware/hwcomposer_defs.h>
	#include <math/mat4.h>
	#include <renderengine/RenderEngine.h>
	#include <system/window.h>
	#include <ui/GraphicTypes.h>
	#include <ui/HdrCapabilities.h>
	#include <ui/Region.h>
	#include <ui/Transform.h>
	#include <utils/Mutex.h>
	#include <utils/RefBase.h>
	#include <utils/Timers.h>

	#include "DisplayHardware/DisplayIdentification.h"
	#include "RenderArea.h"

	namespace android {

	class Fence;
	class HWComposer;
	class IGraphicBufferProducer;
	class Layer;
	class SurfaceFlinger;

	struct CompositionInfo;
	struct DisplayDeviceCreationArgs;
	struct DisplayInfo;

	namespace compositionengine {
	class Display;
	class DisplaySurface;
	} // namespace compositionengine

	class DisplayDevice : public LightRefBase<DisplayDevice> {
	public:
	constexpr static float sDefaultMinLumiance = 0.0;
	constexpr static float sDefaultMaxLumiance = 500.0;

	enum {
	NO_LAYER_STACK = 0xFFFFFFFF,
	};

	explicit DisplayDevice(DisplayDeviceCreationArgs&& args);
	virtual ~DisplayDevice();

	std::shared_ptr<compositionengine::Display> getCompositionDisplay() const {
	return mCompositionDisplay;
	}

	bool isVirtual() const { return mIsVirtual; }
	bool isPrimary() const { return mIsPrimary; }

	// isSecure indicates whether this display can be trusted to display
	// secure surfaces.
	bool isSecure() const;

	int getWidth() const;
	int getHeight() const;
	int getInstallOrientation() const { return mDisplayInstallOrientation; }

	void setVisibleLayersSortedByZ(const Vector< sp<Layer> >& layers);
	const Vector< sp<Layer> >& getVisibleLayersSortedByZ() const;
	void setLayersNeedingFences(const Vector< sp<Layer> >& layers);
	const Vector< sp<Layer> >& getLayersNeedingFences() const;

	void setLayerStack(uint32_t stack);
	void setDisplaySize(const int newWidth, const int newHeight);
	void setProjection(int orientation, const Rect& viewport, const Rect& frame);

	int getOrientation() const { return mOrientation; }
	static uint32_t getPrimaryDisplayOrientationTransform();
	const ui::Transform& getTransform() const;
	const Rect& getViewport() const;
	const Rect& getFrame() const;
	const Rect& getScissor() const;
	bool needsFiltering() const;
	uint32_t getLayerStack() const;

	const std::optional<DisplayId>& getId() const;
	const wp<IBinder>& getDisplayToken() const { return mDisplayToken; }
	int32_t getSequenceId() const { return mSequenceId; }

	const Region& getUndefinedRegion() const;

	int32_t getSupportedPerFrameMetadata() const;

	bool hasWideColorGamut() const;
	// Whether h/w composer has native support for specific HDR type.
	bool hasHDR10PlusSupport() const;
	bool hasHDR10Support() const;
	bool hasHLGSupport() const;
	bool hasDolbyVisionSupport() const;

	// The returned HdrCapabilities is the combination of HDR capabilities from
	// hardware composer and RenderEngine. When the DisplayDevice supports wide
	// color gamut, RenderEngine is able to simulate HDR support in Display P3
	// color space for both PQ and HLG HDR contents. The minimum and maximum
	// luminance will be set to sDefaultMinLumiance and sDefaultMaxLumiance
	// respectively if hardware composer doesn't return meaningful values.
	const HdrCapabilities& getHdrCapabilities() const;

	// Return true if intent is supported by the display.
	bool hasRenderIntent(ui::RenderIntent intent) const;

	const Rect& getBounds() const;
	const Rect& bounds() const { return getBounds(); }

	void setDisplayName(const std::string& displayName);
	const std::string& getDisplayName() const { return mDisplayName; }

	/* ------------------------------------------------------------------------
	* Display power mode management.
	*/
	int getPowerMode() const;
	void setPowerMode(int mode);
	bool isPoweredOn() const;

	ui::Dataspace getCompositionDataSpace() const;

	/* ------------------------------------------------------------------------
	* Display active config management.
	*/
	int getActiveConfig() const;
	void setActiveConfig(int mode);

	// release HWC resources (if any) for removable displays
	void disconnect();

	/* ------------------------------------------------------------------------
	* Debugging
	*/
	uint32_t getPageFlipCount() const;
	std::string getDebugName() const;
	void dump(std::string& result) const;

	private:
	/*
	* Constants, set during initialization
	*/
	const sp<SurfaceFlinger> mFlinger;
	const wp<IBinder> mDisplayToken;
	const int32_t mSequenceId;

	const int mDisplayInstallOrientation;
	const std::shared_ptr<compositionengine::Display> mCompositionDisplay;

	std::string mDisplayName;
	const bool mIsVirtual;

	/*
	* Can only accessed from the main thread, these members
	* don't need synchronization.
	*/

	// list of visible layers on that display
	Vector< sp<Layer> > mVisibleLayersSortedByZ;
	// list of layers needing fences
	Vector< sp<Layer> > mLayersNeedingFences;

	/*
	* Transaction state
	*/
	static uint32_t displayStateOrientationToTransformOrientation(int orientation);
	static status_t orientationToTransfrom(int orientation,
	int w, int h, ui::Transform* tr);

	int mOrientation;
	static uint32_t sPrimaryDisplayOrientation;

	// Current power mode
	int mPowerMode;
	// Current active config
	int mActiveConfig;

	// TODO(b/74619554): Remove special cases for primary display.
	const bool mIsPrimary;
	};

	struct DisplayDeviceState {
	bool isVirtual() const { return !displayId.has_value(); }

	int32_t sequenceId = sNextSequenceId++;
	std::optional<DisplayId> displayId;
	sp<IGraphicBufferProducer> surface;
	uint32_t layerStack = DisplayDevice::NO_LAYER_STACK;
	Rect viewport;
	Rect frame;
	uint8_t orientation = 0;
	uint32_t width = 0;
	uint32_t height = 0;
	std::string displayName;
	bool isSecure = false;

	private:
	static std::atomic<int32_t> sNextSequenceId;
	};

	struct DisplayDeviceCreationArgs {
	// We use a constructor to ensure some of the values are set, without
	// assuming a default value.
	DisplayDeviceCreationArgs(const sp<SurfaceFlinger>& flinger, const wp<IBinder>& displayToken,
	const std::optional<DisplayId>& displayId);

	const sp<SurfaceFlinger> flinger;
	const wp<IBinder> displayToken;
	const std::optional<DisplayId> displayId;

	int32_t sequenceId{0};
	bool isVirtual{false};
	bool isSecure{false};
	sp<ANativeWindow> nativeWindow;
	sp<compositionengine::DisplaySurface> displaySurface;
	int displayInstallOrientation{DisplayState::eOrientationDefault};
	bool hasWideColorGamut{false};
	HdrCapabilities hdrCapabilities;
	int32_t supportedPerFrameMetadata{0};
	std::unordered_map<ui::ColorMode, std::vector<ui::RenderIntent>> hwcColorModes;
	int initialPowerMode{HWC_POWER_MODE_NORMAL};
	bool isPrimary{false};
	};

	class DisplayRenderArea : public RenderArea {
	public:
	DisplayRenderArea(const sp<const DisplayDevice> device,
	ui::Transform::orientation_flags rotation = ui::Transform::ROT_0)
	: DisplayRenderArea(device, device->getBounds(), device->getWidth(), device->getHeight(),
	device->getCompositionDataSpace(), rotation) {}
	DisplayRenderArea(const sp<const DisplayDevice> device, Rect sourceCrop, uint32_t reqWidth,
	uint32_t reqHeight, ui::Dataspace reqDataSpace,
	ui::Transform::orientation_flags rotation, bool allowSecureLayers = true)
	: RenderArea(reqWidth, reqHeight, CaptureFill::OPAQUE, reqDataSpace,
	getDisplayRotation(rotation, device->getInstallOrientation())),
	mDevice(device),
	mSourceCrop(sourceCrop),
	mAllowSecureLayers(allowSecureLayers) {}

	const ui::Transform& getTransform() const override { return mDevice->getTransform(); }
	Rect getBounds() const override { return mDevice->getBounds(); }
	int getHeight() const override { return mDevice->getHeight(); }
	int getWidth() const override { return mDevice->getWidth(); }
	bool isSecure() const override { return mAllowSecureLayers && mDevice->isSecure(); }
	const sp<const DisplayDevice> getDisplayDevice() const override { return mDevice; }

	bool needsFiltering() const override {
	// check if the projection from the logical display to the physical
	// display needs filtering
	if (mDevice->needsFiltering()) {
	return true;
	}

	// check if the projection from the logical render area (i.e., the
	// physical display) to the physical render area requires filtering
	const Rect sourceCrop = getSourceCrop();
	int width = sourceCrop.width();
	int height = sourceCrop.height();
	if (getRotationFlags() & ui::Transform::ROT_90) {
	std::swap(width, height);
	}
	return width != getReqWidth() \|\| height != getReqHeight();
	}

	Rect getSourceCrop() const override {
	// use the projected display viewport by default.
	if (mSourceCrop.isEmpty()) {
	return mDevice->getScissor();
	}

	// Recompute the device transformation for the source crop.
	ui::Transform rotation;
	ui::Transform translatePhysical;
	ui::Transform translateLogical;
	ui::Transform scale;
	const Rect& viewport = mDevice->getViewport();
	const Rect& scissor = mDevice->getScissor();
	const Rect& frame = mDevice->getFrame();

	const int orientation = mDevice->getInstallOrientation();
	// Install orientation is transparent to the callers. Apply it now.
	uint32_t flags = 0x00;
	switch (orientation) {
	case DisplayState::eOrientation90:
	flags = ui::Transform::ROT_90;
	break;
	case DisplayState::eOrientation180:
	flags = ui::Transform::ROT_180;
	break;
	case DisplayState::eOrientation270:
	flags = ui::Transform::ROT_270;
	break;
	default:
	break;
	}
	rotation.set(flags, getWidth(), getHeight());
	translateLogical.set(-viewport.left, -viewport.top);
	translatePhysical.set(scissor.left, scissor.top);
	scale.set(frame.getWidth() / float(viewport.getWidth()), 0, 0,
	frame.getHeight() / float(viewport.getHeight()));
	const ui::Transform finalTransform =
	rotation * translatePhysical * scale * translateLogical;
	return finalTransform.transform(mSourceCrop);
	}

	private:
	// Install orientation is transparent to the callers. We need to cancel
	// it out by modifying rotation flags.
	static ui::Transform::orientation_flags getDisplayRotation(
	ui::Transform::orientation_flags rotation, int orientation) {
	if (orientation == DisplayState::eOrientationDefault) {
	return rotation;
	}

	// convert hw orientation into flag presentation
	// here inverse transform needed
	uint8_t hw_rot_90 = 0x00;
	uint8_t hw_flip_hv = 0x00;
	switch (orientation) {
	case DisplayState::eOrientation90:
	hw_rot_90 = ui::Transform::ROT_90;
	hw_flip_hv = ui::Transform::ROT_180;
	break;
	case DisplayState::eOrientation180:
	hw_flip_hv = ui::Transform::ROT_180;
	break;
	case DisplayState::eOrientation270:
	hw_rot_90 = ui::Transform::ROT_90;
	break;
	}

	// transform flags operation
	// 1) flip H V if both have ROT_90 flag
	// 2) XOR these flags
	uint8_t rotation_rot_90 = rotation & ui::Transform::ROT_90;
	uint8_t rotation_flip_hv = rotation & ui::Transform::ROT_180;
	if (rotation_rot_90 & hw_rot_90) {
	rotation_flip_hv = (~rotation_flip_hv) & ui::Transform::ROT_180;
	}

	return static_cast<ui::Transform::orientation_flags>(
	(rotation_rot_90 ^ hw_rot_90) \| (rotation_flip_hv ^ hw_flip_hv));
	}

	const sp<const DisplayDevice> mDevice;
	const Rect mSourceCrop;
	const bool mAllowSecureLayers;
	};

	}; // namespace android

	#endif // ANDROID_DISPLAY_DEVICE_H