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* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#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> {
constexpr static float sDefaultMinLumiance = 0.0;
constexpr static float sDefaultMaxLumiance = 500.0;
enum {
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;
* 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;
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 {
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())),
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;
case DisplayState::eOrientation180:
flags = ui::Transform::ROT_180;
case DisplayState::eOrientation270:
flags = ui::Transform::ROT_270;
rotation.set(flags, getWidth(), getHeight());
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);
// 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;
case DisplayState::eOrientation180:
hw_flip_hv = ui::Transform::ROT_180;
case DisplayState::eOrientation270:
hw_rot_90 = ui::Transform::ROT_90;
// 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