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* Copyright (C) 2016 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 "drmdisplaycompositor.h"
#include "drmhwcomposer.h"
#include "platform.h"
#include "resourcemanager.h"
#include "vsyncworker.h"
#include <hardware/hwcomposer2.h>
#include <map>
namespace android {
class DrmHwcTwo : public hwc2_device_t {
static int HookDevOpen(const struct hw_module_t *module, const char *name,
struct hw_device_t **dev);
HWC2::Error Init();
class HwcLayer {
HWC2::Composition sf_type() const {
return sf_type_;
HWC2::Composition validated_type() const {
return validated_type_;
void accept_type_change() {
sf_type_ = validated_type_;
void set_validated_type(HWC2::Composition type) {
validated_type_ = type;
bool type_changed() const {
return sf_type_ != validated_type_;
uint32_t z_order() const {
return z_order_;
buffer_handle_t buffer() {
return buffer_;
void set_buffer(buffer_handle_t buffer) {
buffer_ = buffer;
int take_acquire_fence() {
return acquire_fence_.Release();
void set_acquire_fence(int acquire_fence) {
int release_fence() {
return release_fence_.get();
int take_release_fence() {
return release_fence_.Release();
void manage_release_fence() {
release_fence_raw_ = -1;
OutputFd release_fence_output() {
return OutputFd(&release_fence_raw_);
void PopulateDrmLayer(DrmHwcLayer *layer);
// Layer hooks
HWC2::Error SetCursorPosition(int32_t x, int32_t y);
HWC2::Error SetLayerBlendMode(int32_t mode);
HWC2::Error SetLayerBuffer(buffer_handle_t buffer, int32_t acquire_fence);
HWC2::Error SetLayerColor(hwc_color_t color);
HWC2::Error SetLayerCompositionType(int32_t type);
HWC2::Error SetLayerDataspace(int32_t dataspace);
HWC2::Error SetLayerDisplayFrame(hwc_rect_t frame);
HWC2::Error SetLayerPlaneAlpha(float alpha);
HWC2::Error SetLayerSidebandStream(const native_handle_t *stream);
HWC2::Error SetLayerSourceCrop(hwc_frect_t crop);
HWC2::Error SetLayerSurfaceDamage(hwc_region_t damage);
HWC2::Error SetLayerTransform(int32_t transform);
HWC2::Error SetLayerVisibleRegion(hwc_region_t visible);
HWC2::Error SetLayerZOrder(uint32_t z);
// sf_type_ stores the initial type given to us by surfaceflinger,
// validated_type_ stores the type after running ValidateDisplay
HWC2::Composition sf_type_ = HWC2::Composition::Invalid;
HWC2::Composition validated_type_ = HWC2::Composition::Invalid;
HWC2::BlendMode blending_ = HWC2::BlendMode::None;
buffer_handle_t buffer_;
UniqueFd acquire_fence_;
int release_fence_raw_ = -1;
UniqueFd release_fence_;
hwc_rect_t display_frame_;
float alpha_ = 1.0f;
hwc_frect_t source_crop_;
int32_t cursor_x_;
int32_t cursor_y_;
HWC2::Transform transform_ = HWC2::Transform::None;
uint32_t z_order_ = 0;
android_dataspace_t dataspace_ = HAL_DATASPACE_UNKNOWN;
struct HwcCallback {
HwcCallback(hwc2_callback_data_t d, hwc2_function_pointer_t f)
: data(d), func(f) {
hwc2_callback_data_t data;
hwc2_function_pointer_t func;
class HwcDisplay {
HwcDisplay(ResourceManager *resource_manager, DrmDevice *drm,
std::shared_ptr<Importer> importer, hwc2_display_t handle,
HWC2::DisplayType type);
HwcDisplay(const HwcDisplay &) = delete;
HWC2::Error Init(std::vector<DrmPlane *> *planes);
HWC2::Error RegisterVsyncCallback(hwc2_callback_data_t data,
hwc2_function_pointer_t func);
// HWC Hooks
HWC2::Error AcceptDisplayChanges();
HWC2::Error CreateLayer(hwc2_layer_t *layer);
HWC2::Error DestroyLayer(hwc2_layer_t layer);
HWC2::Error GetActiveConfig(hwc2_config_t *config);
HWC2::Error GetChangedCompositionTypes(uint32_t *num_elements,
hwc2_layer_t *layers,
int32_t *types);
HWC2::Error GetClientTargetSupport(uint32_t width, uint32_t height,
int32_t format, int32_t dataspace);
HWC2::Error GetColorModes(uint32_t *num_modes, int32_t *modes);
HWC2::Error GetDisplayAttribute(hwc2_config_t config, int32_t attribute,
int32_t *value);
HWC2::Error GetDisplayConfigs(uint32_t *num_configs,
hwc2_config_t *configs);
HWC2::Error GetDisplayName(uint32_t *size, char *name);
HWC2::Error GetDisplayRequests(int32_t *display_requests,
uint32_t *num_elements, hwc2_layer_t *layers,
int32_t *layer_requests);
HWC2::Error GetDisplayType(int32_t *type);
HWC2::Error GetDozeSupport(int32_t *support);
HWC2::Error GetHdrCapabilities(uint32_t *num_types, int32_t *types,
float *max_luminance,
float *max_average_luminance,
float *min_luminance);
HWC2::Error GetReleaseFences(uint32_t *num_elements, hwc2_layer_t *layers,
int32_t *fences);
HWC2::Error PresentDisplay(int32_t *retire_fence);
HWC2::Error SetActiveConfig(hwc2_config_t config);
HWC2::Error SetClientTarget(buffer_handle_t target, int32_t acquire_fence,
int32_t dataspace, hwc_region_t damage);
HWC2::Error SetColorMode(int32_t mode);
HWC2::Error SetColorTransform(const float *matrix, int32_t hint);
HWC2::Error SetOutputBuffer(buffer_handle_t buffer, int32_t release_fence);
HWC2::Error SetPowerMode(int32_t mode);
HWC2::Error SetVsyncEnabled(int32_t enabled);
HWC2::Error ValidateDisplay(uint32_t *num_types, uint32_t *num_requests);
HwcLayer &get_layer(hwc2_layer_t layer) {
HWC2::Error CreateComposition(bool test);
void AddFenceToRetireFence(int fd);
ResourceManager *resource_manager_;
DrmDevice *drm_;
DrmDisplayCompositor compositor_;
std::shared_ptr<Importer> importer_;
std::unique_ptr<Planner> planner_;
std::vector<DrmPlane *> primary_planes_;
std::vector<DrmPlane *> overlay_planes_;
VSyncWorker vsync_worker_;
DrmConnector *connector_ = NULL;
DrmCrtc *crtc_ = NULL;
hwc2_display_t handle_;
HWC2::DisplayType type_;
uint32_t layer_idx_ = 0;
std::map<hwc2_layer_t, HwcLayer> layers_;
HwcLayer client_layer_;
UniqueFd retire_fence_;
UniqueFd next_retire_fence_;
int32_t color_mode_;
uint32_t frame_no_ = 0;
static DrmHwcTwo *toDrmHwcTwo(hwc2_device_t *dev) {
return static_cast<DrmHwcTwo *>(dev);
template <typename PFN, typename T>
static hwc2_function_pointer_t ToHook(T function) {
static_assert(std::is_same<PFN, T>::value, "Incompatible fn pointer");
return reinterpret_cast<hwc2_function_pointer_t>(function);
template <typename T, typename HookType, HookType func, typename... Args>
static T DeviceHook(hwc2_device_t *dev, Args... args) {
DrmHwcTwo *hwc = toDrmHwcTwo(dev);
return static_cast<T>(((*hwc).*func)(std::forward<Args>(args)...));
template <typename HookType, HookType func, typename... Args>
static int32_t DisplayHook(hwc2_device_t *dev, hwc2_display_t display_handle,
Args... args) {
DrmHwcTwo *hwc = toDrmHwcTwo(dev);
HwcDisplay &display = hwc->;
return static_cast<int32_t>((display.*func)(std::forward<Args>(args)...));
template <typename HookType, HookType func, typename... Args>
static int32_t LayerHook(hwc2_device_t *dev, hwc2_display_t display_handle,
hwc2_layer_t layer_handle, Args... args) {
DrmHwcTwo *hwc = toDrmHwcTwo(dev);
HwcDisplay &display = hwc->;
HwcLayer &layer = display.get_layer(layer_handle);
return static_cast<int32_t>((layer.*func)(std::forward<Args>(args)...));
// hwc2_device_t hooks
static int HookDevClose(hw_device_t *dev);
static void HookDevGetCapabilities(hwc2_device_t *dev, uint32_t *out_count,
int32_t *out_capabilities);
static hwc2_function_pointer_t HookDevGetFunction(struct hwc2_device *device,
int32_t descriptor);
// Device functions
HWC2::Error CreateVirtualDisplay(uint32_t width, uint32_t height,
int32_t *format, hwc2_display_t *display);
HWC2::Error DestroyVirtualDisplay(hwc2_display_t display);
void Dump(uint32_t *size, char *buffer);
uint32_t GetMaxVirtualDisplayCount();
HWC2::Error RegisterCallback(int32_t descriptor, hwc2_callback_data_t data,
hwc2_function_pointer_t function);
ResourceManager resource_manager_;
std::map<hwc2_display_t, HwcDisplay> displays_;
std::map<HWC2::Callback, HwcCallback> callbacks_;
} // namespace android