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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 <gui/IGraphicBufferProducer.h>
#include <gui/BufferQueue.h>
#include <ui/ANativeObjectBase.h>
#include <ui/Region.h>
#include <utils/RefBase.h>
#include <utils/threads.h>
#include <utils/KeyedVector.h>
struct ANativeWindow_Buffer;
namespace android {
* An implementation of ANativeWindow that feeds graphics buffers into a
* BufferQueue.
* This is typically used by programs that want to render frames through
* some means (maybe OpenGL, a software renderer, or a hardware decoder)
* and have the frames they create forwarded to SurfaceFlinger for
* compositing. For example, a video decoder could render a frame and call
* eglSwapBuffers(), which invokes ANativeWindow callbacks defined by
* Surface. Surface then forwards the buffers through Binder IPC
* to the BufferQueue's producer interface, providing the new frame to a
* consumer such as GLConsumer.
class Surface
: public ANativeObjectBase<ANativeWindow, Surface, RefBase>
* creates a Surface from the given IGraphicBufferProducer (which concrete
* implementation is a BufferQueue).
* Surface is mainly state-less while it's disconnected, it can be
* viewed as a glorified IGraphicBufferProducer holder. It's therefore
* safe to create other Surfaces from the same IGraphicBufferProducer.
* However, once a Surface is connected, it'll prevent other Surfaces
* referring to the same IGraphicBufferProducer to become connected and
* therefore prevent them to be used as actual producers of buffers.
* the controlledByApp flag indicates that this Surface (producer) is
* controlled by the application. This flag is used at connect time.
Surface(const sp<IGraphicBufferProducer>& bufferProducer, bool controlledByApp = false);
/* getIGraphicBufferProducer() returns the IGraphicBufferProducer this
* Surface was created with. Usually it's an error to use the
* IGraphicBufferProducer while the Surface is connected.
sp<IGraphicBufferProducer> getIGraphicBufferProducer() const;
/* convenience function to check that the given surface is non NULL as
* well as its IGraphicBufferProducer */
static bool isValid(const sp<Surface>& surface) {
return surface != NULL && surface->getIGraphicBufferProducer() != NULL;
/* Attaches a sideband buffer stream to the Surface's IGraphicBufferProducer.
* A sideband stream is a device-specific mechanism for passing buffers
* from the producer to the consumer without using dequeueBuffer/
* queueBuffer. If a sideband stream is present, the consumer can choose
* whether to acquire buffers from the sideband stream or from the queued
* buffers.
* Passing NULL or a different stream handle will detach the previous
* handle if any.
void setSidebandStream(const sp<NativeHandle>& stream);
/* Allocates buffers based on the current dimensions/format.
* This function will allocate up to the maximum number of buffers
* permitted by the current BufferQueue configuration. It will use the
* default format and dimensions. This is most useful to avoid an allocation
* delay during dequeueBuffer. If there are already the maximum number of
* buffers allocated, this function has no effect.
void allocateBuffers();
/* Sets the generation number on the IGraphicBufferProducer and updates the
* generation number on any buffers attached to the Surface after this call.
* See IGBP::setGenerationNumber for more information. */
status_t setGenerationNumber(uint32_t generationNumber);
// See IGraphicBufferProducer::getConsumerName
String8 getConsumerName() const;
virtual ~Surface();
// can't be copied
Surface& operator = (const Surface& rhs);
Surface(const Surface& rhs);
// ANativeWindow hooks
static int hook_cancelBuffer(ANativeWindow* window,
ANativeWindowBuffer* buffer, int fenceFd);
static int hook_dequeueBuffer(ANativeWindow* window,
ANativeWindowBuffer** buffer, int* fenceFd);
static int hook_perform(ANativeWindow* window, int operation, ...);
static int hook_query(const ANativeWindow* window, int what, int* value);
static int hook_queueBuffer(ANativeWindow* window,
ANativeWindowBuffer* buffer, int fenceFd);
static int hook_setSwapInterval(ANativeWindow* window, int interval);
static int hook_cancelBuffer_DEPRECATED(ANativeWindow* window,
ANativeWindowBuffer* buffer);
static int hook_dequeueBuffer_DEPRECATED(ANativeWindow* window,
ANativeWindowBuffer** buffer);
static int hook_lockBuffer_DEPRECATED(ANativeWindow* window,
ANativeWindowBuffer* buffer);
static int hook_queueBuffer_DEPRECATED(ANativeWindow* window,
ANativeWindowBuffer* buffer);
int dispatchConnect(va_list args);
int dispatchDisconnect(va_list args);
int dispatchSetBufferCount(va_list args);
int dispatchSetBuffersGeometry(va_list args);
int dispatchSetBuffersDimensions(va_list args);
int dispatchSetBuffersUserDimensions(va_list args);
int dispatchSetBuffersFormat(va_list args);
int dispatchSetScalingMode(va_list args);
int dispatchSetBuffersTransform(va_list args);
int dispatchSetBuffersStickyTransform(va_list args);
int dispatchSetBuffersTimestamp(va_list args);
int dispatchSetCrop(va_list args);
int dispatchSetPostTransformCrop(va_list args);
int dispatchSetUsage(va_list args);
int dispatchLock(va_list args);
int dispatchUnlockAndPost(va_list args);
int dispatchSetSidebandStream(va_list args);
int dispatchSetBuffersDataSpace(va_list args);
int dispatchSetSurfaceDamage(va_list args);
virtual int dequeueBuffer(ANativeWindowBuffer** buffer, int* fenceFd);
virtual int cancelBuffer(ANativeWindowBuffer* buffer, int fenceFd);
virtual int queueBuffer(ANativeWindowBuffer* buffer, int fenceFd);
virtual int perform(int operation, va_list args);
virtual int query(int what, int* value) const;
virtual int setSwapInterval(int interval);
virtual int lockBuffer_DEPRECATED(ANativeWindowBuffer* buffer);
virtual int connect(int api);
virtual int disconnect(int api);
virtual int setBufferCount(int bufferCount);
virtual int setBuffersDimensions(uint32_t width, uint32_t height);
virtual int setBuffersUserDimensions(uint32_t width, uint32_t height);
virtual int setBuffersFormat(PixelFormat format);
virtual int setScalingMode(int mode);
virtual int setBuffersTransform(uint32_t transform);
virtual int setBuffersStickyTransform(uint32_t transform);
virtual int setBuffersTimestamp(int64_t timestamp);
virtual int setBuffersDataSpace(android_dataspace dataSpace);
virtual int setCrop(Rect const* rect);
virtual int setUsage(uint32_t reqUsage);
virtual void setSurfaceDamage(android_native_rect_t* rects, size_t numRects);
virtual int lock(ANativeWindow_Buffer* outBuffer, ARect* inOutDirtyBounds);
virtual int unlockAndPost();
virtual int connect(int api, const sp<IProducerListener>& listener);
virtual int detachNextBuffer(sp<GraphicBuffer>* outBuffer,
sp<Fence>* outFence);
virtual int attachBuffer(ANativeWindowBuffer*);
void freeAllBuffers();
int getSlotFromBufferLocked(android_native_buffer_t* buffer) const;
struct BufferSlot {
sp<GraphicBuffer> buffer;
Region dirtyRegion;
// mSurfaceTexture is the interface to the surface texture server. All
// operations on the surface texture client ultimately translate into
// interactions with the server using this interface.
// TODO: rename to mBufferProducer
sp<IGraphicBufferProducer> mGraphicBufferProducer;
// mSlots stores the buffers that have been allocated for each buffer slot.
// It is initialized to null pointers, and gets filled in with the result of
// IGraphicBufferProducer::requestBuffer when the client dequeues a buffer from a
// slot that has not yet been used. The buffer allocated to a slot will also
// be replaced if the requested buffer usage or geometry differs from that
// of the buffer allocated to a slot.
BufferSlot mSlots[NUM_BUFFER_SLOTS];
// mReqWidth is the buffer width that will be requested at the next dequeue
// operation. It is initialized to 1.
uint32_t mReqWidth;
// mReqHeight is the buffer height that will be requested at the next
// dequeue operation. It is initialized to 1.
uint32_t mReqHeight;
// mReqFormat is the buffer pixel format that will be requested at the next
// deuque operation. It is initialized to PIXEL_FORMAT_RGBA_8888.
PixelFormat mReqFormat;
// mReqUsage is the set of buffer usage flags that will be requested
// at the next deuque operation. It is initialized to 0.
uint32_t mReqUsage;
// mTimestamp is the timestamp that will be used for the next buffer queue
// operation. It defaults to NATIVE_WINDOW_TIMESTAMP_AUTO, which means that
// a timestamp is auto-generated when queueBuffer is called.
int64_t mTimestamp;
// mDataSpace is the buffer dataSpace that will be used for the next buffer
// queue operation. It defaults to HAL_DATASPACE_UNKNOWN, which
// means that the buffer contains some type of color data.
android_dataspace mDataSpace;
// mCrop is the crop rectangle that will be used for the next buffer
// that gets queued. It is set by calling setCrop.
Rect mCrop;
// mScalingMode is the scaling mode that will be used for the next
// buffers that get queued. It is set by calling setScalingMode.
int mScalingMode;
// mTransform is the transform identifier that will be used for the next
// buffer that gets queued. It is set by calling setTransform.
uint32_t mTransform;
// mStickyTransform is a transform that is applied on top of mTransform
// in each buffer that is queued. This is typically used to force the
// compositor to apply a transform, and will prevent the transform hint
// from being set by the compositor.
uint32_t mStickyTransform;
// mDefaultWidth is default width of the buffers, regardless of the
// native_window_set_buffers_dimensions call.
uint32_t mDefaultWidth;
// mDefaultHeight is default height of the buffers, regardless of the
// native_window_set_buffers_dimensions call.
uint32_t mDefaultHeight;
// mUserWidth, if non-zero, is an application-specified override
// of mDefaultWidth. This is lower priority than the width set by
// native_window_set_buffers_dimensions.
uint32_t mUserWidth;
// mUserHeight, if non-zero, is an application-specified override
// of mDefaultHeight. This is lower priority than the height set
// by native_window_set_buffers_dimensions.
uint32_t mUserHeight;
// mTransformHint is the transform probably applied to buffers of this
// window. this is only a hint, actual transform may differ.
uint32_t mTransformHint;
// mProducerControlledByApp whether this buffer producer is controlled
// by the application
bool mProducerControlledByApp;
// mSwapIntervalZero set if we should drop buffers at queue() time to
// achieve an asynchronous swap interval
bool mSwapIntervalZero;
// mConsumerRunningBehind whether the consumer is running more than
// one buffer behind the producer.
mutable bool mConsumerRunningBehind;
// mMutex is the mutex used to prevent concurrent access to the member
// variables of Surface objects. It must be locked whenever the
// member variables are accessed.
mutable Mutex mMutex;
// must be used from the lock/unlock thread
sp<GraphicBuffer> mLockedBuffer;
sp<GraphicBuffer> mPostedBuffer;
bool mConnectedToCpu;
// When a CPU producer is attached, this reflects the region that the
// producer wished to update as well as whether the Surface was able to copy
// the previous buffer back to allow a partial update.
// When a non-CPU producer is attached, this reflects the surface damage
// (the change since the previous frame) passed in by the producer.
Region mDirtyRegion;
// Stores the current generation number. See setGenerationNumber and
// IGraphicBufferProducer::setGenerationNumber for more information.
uint32_t mGenerationNumber;
}; // namespace android