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* Copyright 2015 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.
#define HWC2_USE_CPP11
#include <hardware/hwcomposer2.h>
#undef HWC2_USE_CPP11
#include <ui/Fence.h>
#include <atomic>
#include <map>
#include <mutex>
#include <queue>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <vector>
struct hwc_composer_device_1;
struct hwc_display_contents_1;
struct hwc_layer_1;
namespace android {
class HWC2On1Adapter : public hwc2_device_t
explicit HWC2On1Adapter(struct hwc_composer_device_1* hwc1Device);
struct hwc_composer_device_1* getHwc1Device() const { return mHwc1Device; }
uint8_t getHwc1MinorVersion() const { return mHwc1MinorVersion; }
static inline HWC2On1Adapter* getAdapter(hwc2_device_t* device) {
return static_cast<HWC2On1Adapter*>(device);
// getCapabilities
void doGetCapabilities(uint32_t* outCount,
int32_t* /*hwc2_capability_t*/ outCapabilities);
static void getCapabilitiesHook(hwc2_device_t* device, uint32_t* outCount,
int32_t* /*hwc2_capability_t*/ outCapabilities) {
getAdapter(device)->doGetCapabilities(outCount, outCapabilities);
// getFunction
hwc2_function_pointer_t doGetFunction(HWC2::FunctionDescriptor descriptor);
static hwc2_function_pointer_t getFunctionHook(hwc2_device_t* device,
int32_t intDesc) {
auto descriptor = static_cast<HWC2::FunctionDescriptor>(intDesc);
return getAdapter(device)->doGetFunction(descriptor);
// Device functions
HWC2::Error createVirtualDisplay(uint32_t width, uint32_t height,
hwc2_display_t* outDisplay);
static int32_t createVirtualDisplayHook(hwc2_device_t* device,
uint32_t width, uint32_t height, int32_t* /*format*/,
hwc2_display_t* outDisplay) {
// HWC1 implementations cannot override the buffer format requested by
// the consumer
auto error = getAdapter(device)->createVirtualDisplay(width, height,
return static_cast<int32_t>(error);
HWC2::Error destroyVirtualDisplay(hwc2_display_t display);
static int32_t destroyVirtualDisplayHook(hwc2_device_t* device,
hwc2_display_t display) {
auto error = getAdapter(device)->destroyVirtualDisplay(display);
return static_cast<int32_t>(error);
std::string mDumpString;
void dump(uint32_t* outSize, char* outBuffer);
static void dumpHook(hwc2_device_t* device, uint32_t* outSize,
char* outBuffer) {
getAdapter(device)->dump(outSize, outBuffer);
uint32_t getMaxVirtualDisplayCount();
static uint32_t getMaxVirtualDisplayCountHook(hwc2_device_t* device) {
return getAdapter(device)->getMaxVirtualDisplayCount();
HWC2::Error registerCallback(HWC2::Callback descriptor,
hwc2_callback_data_t callbackData, hwc2_function_pointer_t pointer);
static int32_t registerCallbackHook(hwc2_device_t* device,
int32_t intDesc, hwc2_callback_data_t callbackData,
hwc2_function_pointer_t pointer) {
auto descriptor = static_cast<HWC2::Callback>(intDesc);
auto error = getAdapter(device)->registerCallback(descriptor,
callbackData, pointer);
return static_cast<int32_t>(error);
// Display functions
class Layer;
class SortLayersByZ {
bool operator()(const std::shared_ptr<Layer>& lhs,
const std::shared_ptr<Layer>& rhs);
class DisplayContentsDeleter {
void operator()(struct hwc_display_contents_1* contents);
class DeferredFence {
: mMutex(),
mFences({Fence::NO_FENCE, Fence::NO_FENCE}) {}
void add(int32_t fenceFd) {
mFences.emplace(new Fence(fenceFd));
const sp<Fence>& get() const {
return mFences.front();
mutable std::mutex mMutex;
std::queue<sp<Fence>> mFences;
class FencedBuffer {
FencedBuffer() : mBuffer(nullptr), mFence(Fence::NO_FENCE) {}
void setBuffer(buffer_handle_t buffer) { mBuffer = buffer; }
void setFence(int fenceFd) { mFence = new Fence(fenceFd); }
buffer_handle_t getBuffer() const { return mBuffer; }
int getFence() const { return mFence->dup(); }
buffer_handle_t mBuffer;
sp<Fence> mFence;
class Display {
typedef std::unique_ptr<hwc_display_contents_1,
DisplayContentsDeleter> HWC1Contents;
Display(HWC2On1Adapter& device, HWC2::DisplayType type);
hwc2_display_t getId() const { return mId; }
HWC2On1Adapter& getDevice() const { return mDevice; }
// Does not require locking because it is set before adding the
// Displays to the Adapter's list of displays
void setHwc1Id(int32_t id) { mHwc1Id = id; }
int32_t getHwc1Id() const { return mHwc1Id; }
void incDirty() { ++mDirtyCount; }
void decDirty() { --mDirtyCount; }
bool isDirty() const { return mDirtyCount > 0 || mZIsDirty; }
// HWC2 Display functions
HWC2::Error acceptChanges();
HWC2::Error createLayer(hwc2_layer_t* outLayerId);
HWC2::Error destroyLayer(hwc2_layer_t layerId);
HWC2::Error getActiveConfig(hwc2_config_t* outConfigId);
HWC2::Error getAttribute(hwc2_config_t configId,
HWC2::Attribute attribute, int32_t* outValue);
HWC2::Error getChangedCompositionTypes(uint32_t* outNumElements,
hwc2_layer_t* outLayers, int32_t* outTypes);
HWC2::Error getColorModes(uint32_t* outNumModes, int32_t* outModes);
HWC2::Error getConfigs(uint32_t* outNumConfigs,
hwc2_config_t* outConfigIds);
HWC2::Error getDozeSupport(int32_t* outSupport);
HWC2::Error getHdrCapabilities(uint32_t* outNumTypes,
int32_t* outTypes, float* outMaxLuminance,
float* outMaxAverageLuminance, float* outMinLuminance);
HWC2::Error getName(uint32_t* outSize, char* outName);
HWC2::Error getReleaseFences(uint32_t* outNumElements,
hwc2_layer_t* outLayers, int32_t* outFences);
HWC2::Error getRequests(int32_t* outDisplayRequests,
uint32_t* outNumElements, hwc2_layer_t* outLayers,
int32_t* outLayerRequests);
HWC2::Error getType(int32_t* outType);
HWC2::Error present(int32_t* outRetireFence);
HWC2::Error setActiveConfig(hwc2_config_t configId);
HWC2::Error setClientTarget(buffer_handle_t target,
int32_t acquireFence, int32_t dataspace,
hwc_region_t damage);
HWC2::Error setColorMode(android_color_mode_t mode);
HWC2::Error setColorTransform(android_color_transform_t hint);
HWC2::Error setOutputBuffer(buffer_handle_t buffer,
int32_t releaseFence);
HWC2::Error setPowerMode(HWC2::PowerMode mode);
HWC2::Error setVsyncEnabled(HWC2::Vsync enabled);
HWC2::Error validate(uint32_t* outNumTypes,
uint32_t* outNumRequests);
HWC2::Error updateLayerZ(hwc2_layer_t layerId, uint32_t z);
// Read configs from HWC1 device
void populateConfigs();
// Set configs for a virtual display
void populateConfigs(uint32_t width, uint32_t height);
bool prepare();
HWC1Contents cloneRequestedContents() const;
void setReceivedContents(HWC1Contents contents);
bool hasChanges() const;
HWC2::Error set(hwc_display_contents_1& hwcContents);
void addRetireFence(int fenceFd);
void addReleaseFences(const hwc_display_contents_1& hwcContents);
bool hasColorTransform() const;
std::string dump() const;
class Config {
Config(Display& display)
: mDisplay(display),
mAttributes() {}
bool isOnDisplay(const Display& display) const {
return display.getId() == mDisplay.getId();
void setAttribute(HWC2::Attribute attribute, int32_t value);
int32_t getAttribute(HWC2::Attribute attribute) const;
void setHwc1Id(uint32_t id);
bool hasHwc1Id(uint32_t id) const;
HWC2::Error getColorModeForHwc1Id(uint32_t id,
android_color_mode_t *outMode) const;
HWC2::Error getHwc1IdForColorMode(android_color_mode_t mode,
uint32_t* outId) const;
void setId(hwc2_config_t id) { mId = id; }
hwc2_config_t getId() const { return mId; }
// Attempts to merge two configs that differ only in color
// mode. Returns whether the merge was successful
bool merge(const Config& other);
std::set<android_color_mode_t> getColorModes() const;
// splitLine divides the output into two lines suitable for
// dumpsys SurfaceFlinger
std::string toString(bool splitLine = false) const;
Display& mDisplay;
hwc2_config_t mId;
std::unordered_map<HWC2::Attribute, int32_t> mAttributes;
// Maps from color transform to HWC1 config ID
std::unordered_map<android_color_mode_t, uint32_t> mHwc1Ids;
class Changes {
uint32_t getNumTypes() const {
return static_cast<uint32_t>(mTypeChanges.size());
uint32_t getNumLayerRequests() const {
return static_cast<uint32_t>(mLayerRequests.size());
const std::unordered_map<hwc2_layer_t, HWC2::Composition>&
getTypeChanges() const {
return mTypeChanges;
const std::unordered_map<hwc2_layer_t, HWC2::LayerRequest>&
getLayerRequests() const {
return mLayerRequests;
int32_t getDisplayRequests() const {
int32_t requests = 0;
for (auto request : mDisplayRequests) {
requests |= static_cast<int32_t>(request);
return requests;
void addTypeChange(hwc2_layer_t layerId,
HWC2::Composition type) {
mTypeChanges.insert({layerId, type});
void clearTypeChanges() { mTypeChanges.clear(); }
void addLayerRequest(hwc2_layer_t layerId,
HWC2::LayerRequest request) {
mLayerRequests.insert({layerId, request});
std::unordered_map<hwc2_layer_t, HWC2::Composition>
std::unordered_map<hwc2_layer_t, HWC2::LayerRequest>
std::unordered_set<HWC2::DisplayRequest> mDisplayRequests;
std::shared_ptr<const Config>
getConfig(hwc2_config_t configId) const;
void populateColorModes();
void initializeActiveConfig();
void reallocateHwc1Contents();
void assignHwc1LayerIds();
void updateTypeChanges(const struct hwc_layer_1& hwc1Layer,
const Layer& layer);
void updateLayerRequests(const struct hwc_layer_1& hwc1Layer,
const Layer& layer);
void prepareFramebufferTarget();
static std::atomic<hwc2_display_t> sNextId;
const hwc2_display_t mId;
HWC2On1Adapter& mDevice;
std::atomic<size_t> mDirtyCount;
// The state of this display should only be modified from
// SurfaceFlinger's main loop, with the exception of when dump is
// called. To prevent a bad state from crashing us during a dump
// call, all public calls into Display must acquire this mutex.
// It is recursive because we don't want to deadlock in validate
// (or present) when we call HWC2On1Adapter::prepareAllDisplays
// (or setAllDisplays), which calls back into Display functions
// which require locking.
mutable std::recursive_mutex mStateMutex;
bool mZIsDirty;
HWC1Contents mHwc1RequestedContents;
HWC1Contents mHwc1ReceivedContents;
DeferredFence mRetireFence;
// Will only be non-null after the layer has been validated but
// before it has been presented
std::unique_ptr<Changes> mChanges;
int32_t mHwc1Id;
std::vector<std::shared_ptr<Config>> mConfigs;
std::shared_ptr<const Config> mActiveConfig;
std::set<android_color_mode_t> mColorModes;
android_color_mode_t mActiveColorMode;
std::string mName;
HWC2::DisplayType mType;
HWC2::PowerMode mPowerMode;
HWC2::Vsync mVsyncEnabled;
FencedBuffer mClientTarget;
FencedBuffer mOutputBuffer;
bool mHasColorTransform;
std::multiset<std::shared_ptr<Layer>, SortLayersByZ> mLayers;
std::unordered_map<size_t, std::shared_ptr<Layer>> mHwc1LayerMap;
template <typename ...Args>
static int32_t callDisplayFunction(hwc2_device_t* device,
hwc2_display_t displayId, HWC2::Error (Display::*member)(Args...),
Args... args) {
auto display = getAdapter(device)->getDisplay(displayId);
if (!display) {
return static_cast<int32_t>(HWC2::Error::BadDisplay);
auto error = ((*display).*member)(std::forward<Args>(args)...);
return static_cast<int32_t>(error);
template <typename MF, MF memFunc, typename ...Args>
static int32_t displayHook(hwc2_device_t* device, hwc2_display_t displayId,
Args... args) {
return HWC2On1Adapter::callDisplayFunction(device, displayId, memFunc,
static int32_t getDisplayAttributeHook(hwc2_device_t* device,
hwc2_display_t display, hwc2_config_t config,
int32_t intAttribute, int32_t* outValue) {
auto attribute = static_cast<HWC2::Attribute>(intAttribute);
return callDisplayFunction(device, display, &Display::getAttribute,
config, attribute, outValue);
static int32_t setColorTransformHook(hwc2_device_t* device,
hwc2_display_t display, const float* /*matrix*/,
int32_t /*android_color_transform_t*/ intHint) {
// We intentionally throw away the matrix, because if the hint is
// anything other than IDENTITY, we have to fall back to client
// composition anyway
auto hint = static_cast<android_color_transform_t>(intHint);
return callDisplayFunction(device, display, &Display::setColorTransform,
static int32_t setColorModeHook(hwc2_device_t* device,
hwc2_display_t display, int32_t /*android_color_mode_t*/ intMode) {
auto mode = static_cast<android_color_mode_t>(intMode);
return callDisplayFunction(device, display, &Display::setColorMode, mode);
static int32_t setPowerModeHook(hwc2_device_t* device,
hwc2_display_t display, int32_t intMode) {
auto mode = static_cast<HWC2::PowerMode>(intMode);
return callDisplayFunction(device, display, &Display::setPowerMode,
static int32_t setVsyncEnabledHook(hwc2_device_t* device,
hwc2_display_t display, int32_t intEnabled) {
auto enabled = static_cast<HWC2::Vsync>(intEnabled);
return callDisplayFunction(device, display, &Display::setVsyncEnabled,
// Layer functions
template <typename T>
class LatchedState {
LatchedState(Layer& parent, T initialValue)
: mParent(parent),
mValue(initialValue) {}
void setPending(T value) {
if (value == mPendingValue) {
if (mPendingValue == mValue) {
} else if (value == mValue) {
mPendingValue = value;
T getValue() const { return mValue; }
T getPendingValue() const { return mPendingValue; }
bool isDirty() const { return mPendingValue != mValue; }
void latch() {
if (isDirty()) {
mValue = mPendingValue;
Layer& mParent;
T mPendingValue;
T mValue;
class Layer {
explicit Layer(Display& display);
bool operator==(const Layer& other) { return mId == other.mId; }
bool operator!=(const Layer& other) { return !(*this == other); }
hwc2_layer_t getId() const { return mId; }
Display& getDisplay() const { return mDisplay; }
void incDirty() { if (mDirtyCount++ == 0) mDisplay.incDirty(); }
void decDirty() { if (--mDirtyCount == 0) mDisplay.decDirty(); }
bool isDirty() const { return mDirtyCount > 0; }
// HWC2 Layer functions
HWC2::Error setBuffer(buffer_handle_t buffer, int32_t acquireFence);
HWC2::Error setCursorPosition(int32_t x, int32_t y);
HWC2::Error setSurfaceDamage(hwc_region_t damage);
// HWC2 Layer state functions
HWC2::Error setBlendMode(HWC2::BlendMode mode);
HWC2::Error setColor(hwc_color_t color);
HWC2::Error setCompositionType(HWC2::Composition type);
HWC2::Error setDataspace(android_dataspace_t dataspace);
HWC2::Error setDisplayFrame(hwc_rect_t frame);
HWC2::Error setPlaneAlpha(float alpha);
HWC2::Error setSidebandStream(const native_handle_t* stream);
HWC2::Error setSourceCrop(hwc_frect_t crop);
HWC2::Error setTransform(HWC2::Transform transform);
HWC2::Error setVisibleRegion(hwc_region_t visible);
HWC2::Error setZ(uint32_t z);
HWC2::Composition getCompositionType() const {
return mCompositionType.getValue();
uint32_t getZ() const { return mZ; }
void addReleaseFence(int fenceFd);
const sp<Fence>& getReleaseFence() const;
void setHwc1Id(size_t id) { mHwc1Id = id; }
size_t getHwc1Id() const { return mHwc1Id; }
void applyState(struct hwc_layer_1& hwc1Layer, bool applyAllState);
std::string dump() const;
void applyCommonState(struct hwc_layer_1& hwc1Layer,
bool applyAllState);
void applySolidColorState(struct hwc_layer_1& hwc1Layer,
bool applyAllState);
void applySidebandState(struct hwc_layer_1& hwc1Layer,
bool applyAllState);
void applyBufferState(struct hwc_layer_1& hwc1Layer);
void applyCompositionType(struct hwc_layer_1& hwc1Layer,
bool applyAllState);
static std::atomic<hwc2_layer_t> sNextId;
const hwc2_layer_t mId;
Display& mDisplay;
size_t mDirtyCount;
FencedBuffer mBuffer;
std::vector<hwc_rect_t> mSurfaceDamage;
LatchedState<HWC2::BlendMode> mBlendMode;
LatchedState<hwc_color_t> mColor;
LatchedState<HWC2::Composition> mCompositionType;
LatchedState<hwc_rect_t> mDisplayFrame;
LatchedState<float> mPlaneAlpha;
LatchedState<const native_handle_t*> mSidebandStream;
LatchedState<hwc_frect_t> mSourceCrop;
LatchedState<HWC2::Transform> mTransform;
LatchedState<std::vector<hwc_rect_t>> mVisibleRegion;
uint32_t mZ;
DeferredFence mReleaseFence;
size_t mHwc1Id;
bool mHasUnsupportedDataspace;
bool mHasUnsupportedPlaneAlpha;
template <typename ...Args>
static int32_t callLayerFunction(hwc2_device_t* device,
hwc2_display_t displayId, hwc2_layer_t layerId,
HWC2::Error (Layer::*member)(Args...), Args... args) {
auto result = getAdapter(device)->getLayer(displayId, layerId);
auto error = std::get<HWC2::Error>(result);
if (error == HWC2::Error::None) {
auto layer = std::get<Layer*>(result);
error = ((*layer).*member)(std::forward<Args>(args)...);
return static_cast<int32_t>(error);
template <typename MF, MF memFunc, typename ...Args>
static int32_t layerHook(hwc2_device_t* device, hwc2_display_t displayId,
hwc2_layer_t layerId, Args... args) {
return HWC2On1Adapter::callLayerFunction(device, displayId, layerId,
memFunc, std::forward<Args>(args)...);
// Layer state functions
static int32_t setLayerBlendModeHook(hwc2_device_t* device,
hwc2_display_t display, hwc2_layer_t layer, int32_t intMode) {
auto mode = static_cast<HWC2::BlendMode>(intMode);
return callLayerFunction(device, display, layer,
&Layer::setBlendMode, mode);
static int32_t setLayerCompositionTypeHook(hwc2_device_t* device,
hwc2_display_t display, hwc2_layer_t layer, int32_t intType) {
auto type = static_cast<HWC2::Composition>(intType);
return callLayerFunction(device, display, layer,
&Layer::setCompositionType, type);
static int32_t setLayerDataspaceHook(hwc2_device_t* device,
hwc2_display_t display, hwc2_layer_t layer, int32_t intDataspace) {
auto dataspace = static_cast<android_dataspace_t>(intDataspace);
return callLayerFunction(device, display, layer, &Layer::setDataspace,
static int32_t setLayerTransformHook(hwc2_device_t* device,
hwc2_display_t display, hwc2_layer_t layer, int32_t intTransform) {
auto transform = static_cast<HWC2::Transform>(intTransform);
return callLayerFunction(device, display, layer, &Layer::setTransform,
static int32_t setLayerZOrderHook(hwc2_device_t* device,
hwc2_display_t display, hwc2_layer_t layer, uint32_t z) {
return callDisplayFunction(device, display, &Display::updateLayerZ,
layer, z);
// Adapter internals
void populateCapabilities();
Display* getDisplay(hwc2_display_t id);
std::tuple<Layer*, HWC2::Error> getLayer(hwc2_display_t displayId,
hwc2_layer_t layerId);
void populatePrimary();
bool prepareAllDisplays();
std::vector<struct hwc_display_contents_1*> mHwc1Contents;
HWC2::Error setAllDisplays();
void hwc1Invalidate();
void hwc1Vsync(int hwc1DisplayId, int64_t timestamp);
void hwc1Hotplug(int hwc1DisplayId, int connected);
// These are set in the constructor and before any asynchronous events are
// possible
struct hwc_composer_device_1* const mHwc1Device;
const uint8_t mHwc1MinorVersion;
bool mHwc1SupportsVirtualDisplays;
class Callbacks;
const std::unique_ptr<Callbacks> mHwc1Callbacks;
std::unordered_set<HWC2::Capability> mCapabilities;
// These are only accessed from the main SurfaceFlinger thread (not from
// callbacks or dump
std::map<hwc2_layer_t, std::shared_ptr<Layer>> mLayers;
std::shared_ptr<Display> mHwc1VirtualDisplay;
// These are potentially accessed from multiple threads, and are protected
// by this mutex. This needs to be recursive, since the HWC1 implementation
// can call back into the invalidate callback on the same thread that is
// calling prepare.
std::recursive_timed_mutex mStateMutex;
struct CallbackInfo {
hwc2_callback_data_t data;
hwc2_function_pointer_t pointer;
std::unordered_map<HWC2::Callback, CallbackInfo> mCallbacks;
bool mHasPendingInvalidate;
std::vector<std::pair<int, int64_t>> mPendingVsyncs;
std::vector<std::pair<int, int>> mPendingHotplugs;
std::map<hwc2_display_t, std::shared_ptr<Display>> mDisplays;
std::unordered_map<int, hwc2_display_t> mHwc1DisplayMap;
} // namespace android