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* Copyright (C) 2010 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 <stdint.h>
#include <sys/types.h>
#include <hardware/hwcomposer_defs.h>
#include <system/graphics.h>
#include <ui/Fence.h>
#include <utils/BitSet.h>
#include <utils/Condition.h>
#include <utils/Mutex.h>
#include <utils/StrongPointer.h>
#include <utils/Thread.h>
#include <utils/Timers.h>
#include <utils/Vector.h>
extern "C" int clock_nanosleep(clockid_t clock_id, int flags,
const struct timespec *request,
struct timespec *remain);
struct hwc_composer_device_1;
struct hwc_display_contents_1;
struct hwc_layer_1;
struct hwc_procs;
struct framebuffer_device_t;
namespace android {
// ---------------------------------------------------------------------------
class Fence;
class FloatRect;
class GraphicBuffer;
class NativeHandle;
class Region;
class String8;
class SurfaceFlinger;
class HWComposer
class EventHandler {
friend class HWComposer;
virtual void onVSyncReceived(
HWComposer* composer, int32_t disp, nsecs_t timestamp) = 0;
virtual void onHotplugReceived(HWComposer* composer, int disp, bool connected) = 0;
virtual void onInvalidateReceived(HWComposer* composer) = 0;
virtual ~EventHandler() {}
enum {
const sp<SurfaceFlinger>& flinger,
EventHandler& handler);
status_t initCheck() const;
// Returns a display ID starting at VIRTUAL_DISPLAY_ID_BASE, this ID is to
// be used with createWorkList (and all other methods requiring an ID
// below).
// IDs below NUM_BUILTIN_DISPLAYS are pre-defined and therefore are
// always valid.
// Returns -1 if an ID cannot be allocated
int32_t allocateDisplayId();
// Recycles the given virtual display ID and frees the associated worklist.
// IDs below NUM_BUILTIN_DISPLAYS are not recycled.
status_t freeDisplayId(int32_t id);
// Asks the HAL what it can do
status_t prepare();
// commits the list
status_t commit();
// set power mode
status_t setPowerMode(int disp, int mode);
// set active config
status_t setActiveConfig(int disp, int mode);
// reset state when an external, non-virtual display is disconnected
void disconnectDisplay(int disp);
// create a work list for numLayers layer. sets HWC_GEOMETRY_CHANGED.
status_t createWorkList(int32_t id, size_t numLayers);
bool supportsFramebufferTarget() const;
// does this display have layers handled by HWC
bool hasHwcComposition(int32_t id) const;
// does this display have layers handled by GLES
bool hasGlesComposition(int32_t id) const;
// get the releaseFence file descriptor for a display's framebuffer layer.
// the release fence is only valid after commit()
sp<Fence> getAndResetReleaseFence(int32_t id);
// needed forward declarations
class LayerListIterator;
// return the visual id to be used to find a suitable EGLConfig for
// *ALL* displays.
int getVisualID() const;
// Forwarding to FB HAL for pre-HWC-1.1 code (see FramebufferSurface).
int fbPost(int32_t id, const sp<Fence>& acquireFence, const sp<GraphicBuffer>& buf);
int fbCompositionComplete();
void fbDump(String8& result);
// Set the output buffer and acquire fence for a virtual display.
// Returns INVALID_OPERATION if id is not a virtual display.
status_t setOutputBuffer(int32_t id, const sp<Fence>& acquireFence,
const sp<GraphicBuffer>& buf);
// Get the retire fence for the last committed frame. This fence will
// signal when the h/w composer is completely finished with the frame.
// For physical displays, it is no longer being displayed. For virtual
// displays, writes to the output buffer are complete.
sp<Fence> getLastRetireFence(int32_t id) const;
status_t setCursorPositionAsync(int32_t id, const Rect &pos);
* Interface to hardware composer's layers functionality.
* This abstracts the HAL interface to layers which can evolve in
* incompatible ways from one release to another.
* The idea is that we could extend this interface as we add
* features to h/w composer.
class HWCLayerInterface {
virtual ~HWCLayerInterface() { }
virtual int32_t getCompositionType() const = 0;
virtual uint32_t getHints() const = 0;
virtual sp<Fence> getAndResetReleaseFence() = 0;
virtual void setDefaultState() = 0;
virtual void setSkip(bool skip) = 0;
virtual void setIsCursorLayerHint(bool isCursor = true) = 0;
virtual void setBlending(uint32_t blending) = 0;
virtual void setTransform(uint32_t transform) = 0;
virtual void setFrame(const Rect& frame) = 0;
virtual void setCrop(const FloatRect& crop) = 0;
virtual void setVisibleRegionScreen(const Region& reg) = 0;
virtual void setSurfaceDamage(const Region& reg) = 0;
virtual void setSidebandStream(const sp<NativeHandle>& stream) = 0;
virtual void setBuffer(const sp<GraphicBuffer>& buffer) = 0;
virtual void setAcquireFenceFd(int fenceFd) = 0;
virtual void setPlaneAlpha(uint8_t alpha) = 0;
virtual void onDisplayed() = 0;
* Interface used to implement an iterator to a list
* of HWCLayer.
class HWCLayer : public HWCLayerInterface {
friend class LayerListIterator;
// select the layer at the given index
virtual status_t setLayer(size_t index) = 0;
virtual HWCLayer* dup() = 0;
static HWCLayer* copy(HWCLayer *rhs) {
return rhs ? rhs->dup() : nullptr;
virtual ~HWCLayer() { }
* Iterator through a HWCLayer list.
* This behaves more or less like a forward iterator.
class LayerListIterator {
friend class HWComposer;
HWCLayer* const mLayerList;
size_t mIndex;
LayerListIterator() : mLayerList(nullptr), mIndex(0) { }
LayerListIterator(HWCLayer* layer, size_t index)
: mLayerList(layer), mIndex(index) { }
// we don't allow assignment, because we don't need it for now
LayerListIterator& operator = (const LayerListIterator& rhs);
// copy operators
LayerListIterator(const LayerListIterator& rhs)
: mLayerList(HWCLayer::copy(rhs.mLayerList)), mIndex(rhs.mIndex) {
~LayerListIterator() { delete mLayerList; }
// pre-increment
LayerListIterator& operator++() {
return *this;
// dereference
HWCLayerInterface& operator * () { return *mLayerList; }
HWCLayerInterface* operator -> () { return mLayerList; }
// comparison
bool operator == (const LayerListIterator& rhs) const {
return mIndex == rhs.mIndex;
bool operator != (const LayerListIterator& rhs) const {
return !operator==(rhs);
// Returns an iterator to the beginning of the layer list
LayerListIterator begin(int32_t id);
// Returns an iterator to the end of the layer list
LayerListIterator end(int32_t id);
// Events handling ---------------------------------------------------------
enum {
void eventControl(int disp, int event, int enabled);
struct DisplayConfig {
uint32_t width;
uint32_t height;
float xdpi;
float ydpi;
nsecs_t refresh;
android_color_mode_t colorMode;
bool operator==(const DisplayConfig& rhs) const {
return width == rhs.width &&
height == rhs.height &&
xdpi == rhs.xdpi &&
ydpi == rhs.ydpi &&
refresh == rhs.refresh &&
colorMode == rhs.colorMode;
// Query display parameters. Pass in a display index (e.g.
nsecs_t getRefreshTimestamp(int disp) const;
sp<Fence> getDisplayFence(int disp) const;
uint32_t getFormat(int disp) const;
bool isConnected(int disp) const;
// These return the values for the current config of a given display index.
// To get the values for all configs, use getConfigs below.
uint32_t getWidth(int disp) const;
uint32_t getHeight(int disp) const;
float getDpiX(int disp) const;
float getDpiY(int disp) const;
nsecs_t getRefreshPeriod(int disp) const;
android_color_mode_t getColorMode(int disp) const;
const Vector<DisplayConfig>& getConfigs(int disp) const;
size_t getCurrentConfig(int disp) const;
status_t setVirtualDisplayProperties(int32_t id, uint32_t w, uint32_t h,
uint32_t format);
// this class is only used to fake the VSync event on systems that don't
// have it.
class VSyncThread : public Thread {
HWComposer& mHwc;
mutable Mutex mLock;
Condition mCondition;
bool mEnabled;
mutable nsecs_t mNextFakeVSync;
nsecs_t mRefreshPeriod;
virtual void onFirstRef();
virtual bool threadLoop();
VSyncThread(HWComposer& hwc);
void setEnabled(bool enabled);
friend class VSyncThread;
// for debugging ----------------------------------------------------------
void dump(String8& out) const;
void loadHwcModule();
int loadFbHalModule();
LayerListIterator getLayerIterator(int32_t id, size_t index);
struct cb_context;
static void hook_invalidate(const struct hwc_procs* procs);
static void hook_vsync(const struct hwc_procs* procs, int disp,
int64_t timestamp);
static void hook_hotplug(const struct hwc_procs* procs, int disp,
int connected);
inline void invalidate();
inline void vsync(int disp, int64_t timestamp);
inline void hotplug(int disp, int connected);
status_t queryDisplayProperties(int disp);
status_t setFramebufferTarget(int32_t id,
const sp<Fence>& acquireFence, const sp<GraphicBuffer>& buf);
struct DisplayData {
Vector<DisplayConfig> configs;
size_t currentConfig;
uint32_t format; // pixel format from FB hal, for pre-hwc-1.1
bool connected;
bool hasFbComp;
bool hasOvComp;
size_t capacity;
hwc_display_contents_1* list;
hwc_layer_1* framebufferTarget;
buffer_handle_t fbTargetHandle;
sp<Fence> lastRetireFence; // signals when the last set op retires
sp<Fence> lastDisplayFence; // signals when the last set op takes
// effect on screen
buffer_handle_t outbufHandle;
sp<Fence> outbufAcquireFence;
// protected by mEventControlLock
int32_t events;
// We need to hold "copies" of these for memory management purposes. The
// actual hwc_layer_1_t holds pointers to the memory within. Vector<>
// internally doesn't copy the memory unless one of the copies is
// modified.
Vector<Region> visibleRegions;
Vector<Region> surfaceDamageRegions;
sp<SurfaceFlinger> mFlinger;
framebuffer_device_t* mFbDev;
struct hwc_composer_device_1* mHwc;
// invariant: mLists[0] != nullptr iff mHwc != nullptr
// mLists[i>0] can be nullptr. that display is to be ignored
struct hwc_display_contents_1* mLists[MAX_HWC_DISPLAYS];
DisplayData mDisplayData[MAX_HWC_DISPLAYS];
// protect mDisplayData from races between prepare and dump
mutable Mutex mDisplayLock;
size_t mNumDisplays;
cb_context* mCBContext;
EventHandler& mEventHandler;
sp<VSyncThread> mVSyncThread;
bool mDebugForceFakeVSync;
BitSet32 mAllocatedDisplayIDs;
// protected by mLock
mutable Mutex mLock;
mutable nsecs_t mLastHwVSync[HWC_NUM_PHYSICAL_DISPLAY_TYPES];
// thread-safe
mutable Mutex mEventControlLock;
// ---------------------------------------------------------------------------
}; // namespace android