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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 <stdint.h>
#include <sys/types.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <GLES/gl.h>
#include <utils/RefBase.h>
#include <ui/Region.h>
#include <gui/ISurfaceComposerClient.h>
#include <private/gui/LayerState.h>
#include <hardware/hwcomposer.h>
#include "DisplayHardware/DisplayHardware.h"
#include "Transform.h"
namespace android {
// ---------------------------------------------------------------------------
class Client;
class DisplayHardware;
class GraphicBuffer;
class GraphicPlane;
class Layer;
class LayerBaseClient;
class SurfaceFlinger;
// ---------------------------------------------------------------------------
class LayerBase : public RefBase
static int32_t sSequence;
LayerBase(SurfaceFlinger* flinger, DisplayID display);
DisplayID dpy;
mutable bool contentDirty;
Region visibleRegionScreen;
Region transparentRegionScreen;
Region coveredRegionScreen;
int32_t sequence;
struct Geometry {
uint32_t w;
uint32_t h;
Rect crop;
inline bool operator == (const Geometry& rhs) const {
return (w==rhs.w && h==rhs.h && crop==rhs.crop);
inline bool operator != (const Geometry& rhs) const {
return !operator == (rhs);
struct State {
Geometry active;
Geometry requested;
uint32_t z;
uint8_t alpha;
uint8_t flags;
uint8_t reserved[2];
int32_t sequence; // changes when visible regions can change
Transform transform;
Region transparentRegion;
virtual void setName(const String8& name);
String8 getName() const;
// modify current state
bool setPosition(float x, float y);
bool setLayer(uint32_t z);
bool setSize(uint32_t w, uint32_t h);
bool setAlpha(uint8_t alpha);
bool setMatrix(const layer_state_t::matrix22_t& matrix);
bool setTransparentRegionHint(const Region& opaque);
bool setFlags(uint8_t flags, uint8_t mask);
bool setCrop(const Rect& crop);
void commitTransaction();
bool requestTransaction();
void forceVisibilityTransaction();
uint32_t getTransactionFlags(uint32_t flags);
uint32_t setTransactionFlags(uint32_t flags);
Rect visibleBounds() const;
virtual sp<LayerBaseClient> getLayerBaseClient() const { return 0; }
virtual sp<Layer> getLayer() const { return 0; }
virtual const char* getTypeId() const { return "LayerBase"; }
virtual void setGeometry(hwc_layer_t* hwcl);
virtual void setPerFrameData(hwc_layer_t* hwcl);
* draw - performs some global clipping optimizations
* and calls onDraw().
* Typically this method is not overridden, instead implement onDraw()
* to perform the actual drawing.
virtual void draw(const Region& clip) const;
virtual void drawForSreenShot();
* onDraw - draws the surface.
virtual void onDraw(const Region& clip) const = 0;
* initStates - called just after construction
virtual void initStates(uint32_t w, uint32_t h, uint32_t flags);
* doTransaction - process the transaction. This is a good place to figure
* out which attributes of the surface have changed.
virtual uint32_t doTransaction(uint32_t transactionFlags);
* setVisibleRegion - called to set the new visible region. This gives
* a chance to update the new visible region or record the fact it changed.
virtual void setVisibleRegion(const Region& visibleRegion);
* setCoveredRegion - called when the covered region changes. The covered
* region corresponds to any area of the surface that is covered
* (transparently or not) by another surface.
virtual void setCoveredRegion(const Region& coveredRegion);
* validateVisibility - cache a bunch of things
virtual void validateVisibility(const Transform& globalTransform);
* lockPageFlip - called each time the screen is redrawn and returns whether
* the visible regions need to be recomputed (this is a fairly heavy
* operation, so this should be set only if needed). Typically this is used
* to figure out if the content or size of a surface has changed.
virtual void lockPageFlip(bool& recomputeVisibleRegions);
* unlockPageFlip - called each time the screen is redrawn. updates the
* final dirty region wrt the planeTransform.
* At this point, all visible regions, surface position and size, etc... are
* correct.
virtual void unlockPageFlip(const Transform& planeTransform, Region& outDirtyRegion);
* isOpaque - true if this surface is opaque
virtual bool isOpaque() const { return true; }
* needsDithering - true if this surface needs dithering
virtual bool needsDithering() const { return false; }
* needsLinearFiltering - true if this surface's state requires filtering
virtual bool needsFiltering() const { return mNeedsFiltering; }
* isSecure - true if this surface is secure, that is if it prevents
* screenshots or VNC servers.
virtual bool isSecure() const { return false; }
* isProtected - true if the layer may contain protected content in the
virtual bool isProtected() const { return false; }
/** called with the state lock when the surface is removed from the
* current list */
virtual void onRemoved() { }
/** called after page-flip
virtual void onLayerDisplayed() { }
/** called before composition.
* returns true if the layer has pending updates.
virtual bool onPreComposition() { return false; }
/** always call base class first */
virtual void dump(String8& result, char* scratch, size_t size) const;
virtual void shortDump(String8& result, char* scratch, size_t size) const;
virtual void dumpStats(String8& result, char* buffer, size_t SIZE) const;
virtual void clearStats();
enum { // flags for doTransaction()
eDontUpdateGeometryState = 0x00000001,
eVisibleRegion = 0x00000002,
inline const State& drawingState() const { return mDrawingState; }
inline const State& currentState() const { return mCurrentState; }
inline State& currentState() { return mCurrentState; }
int32_t getOrientation() const { return mOrientation; }
int32_t getPlaneOrientation() const { return mPlaneOrientation; }
void clearWithOpenGL(const Region& clip) const;
const GraphicPlane& graphicPlane(int dpy) const;
GraphicPlane& graphicPlane(int dpy);
void clearWithOpenGL(const Region& clip, GLclampf r, GLclampf g,
GLclampf b, GLclampf alpha) const;
void drawWithOpenGL(const Region& clip) const;
void setFiltering(bool filtering);
bool getFiltering() const;
sp<SurfaceFlinger> mFlinger;
uint32_t mFlags;
// accessed only in the main thread
// Whether filtering is forced on or not
bool mFiltering;
// cached during validateVisibility()
// Whether filtering is needed b/c of the drawingstate
bool mNeedsFiltering;
// cached during validateVisibility()
int32_t mOrientation;
int32_t mPlaneOrientation;
Transform mTransform;
GLfloat mVertices[4][2];
size_t mNumVertices;
Rect mTransformedBounds;
// these are protected by an external lock
State mCurrentState;
State mDrawingState;
volatile int32_t mTransactionFlags;
// don't change, don't need a lock
bool mPremultipliedAlpha;
String8 mName;
mutable bool mDebug;
// called from class SurfaceFlinger
virtual ~LayerBase();
LayerBase(const LayerBase& rhs);
// ---------------------------------------------------------------------------
class LayerBaseClient : public LayerBase
LayerBaseClient(SurfaceFlinger* flinger, DisplayID display,
const sp<Client>& client);
virtual ~LayerBaseClient();
sp<ISurface> getSurface();
wp<IBinder> getSurfaceBinder() const;
virtual wp<IBinder> getSurfaceTextureBinder() const;
virtual sp<LayerBaseClient> getLayerBaseClient() const {
return const_cast<LayerBaseClient*>(this); }
virtual const char* getTypeId() const { return "LayerBaseClient"; }
uint32_t getIdentity() const { return mIdentity; }
virtual void dump(String8& result, char* scratch, size_t size) const;
virtual void shortDump(String8& result, char* scratch, size_t size) const;
class LayerCleaner {
sp<SurfaceFlinger> mFlinger;
wp<LayerBaseClient> mLayer;
LayerCleaner(const sp<SurfaceFlinger>& flinger,
const sp<LayerBaseClient>& layer);
virtual sp<ISurface> createSurface();
mutable Mutex mLock;
mutable bool mHasSurface;
wp<IBinder> mClientSurfaceBinder;
const wp<Client> mClientRef;
// only read
const uint32_t mIdentity;
static int32_t sIdentity;
// ---------------------------------------------------------------------------
}; // namespace android