/*
* Copyright (C) 2013 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_GUI_IGRAPHICBUFFERCONSUMER_H
#define ANDROID_GUI_IGRAPHICBUFFERCONSUMER_H
#include <stdint.h>
#include <sys/types.h>
#include <utils/Errors.h>
#include <utils/RefBase.h>
#include <utils/Timers.h>
#include <binder/IInterface.h>
#include <ui/PixelFormat.h>
#include <ui/Rect.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
namespace android {
// ----------------------------------------------------------------------------
class BufferItem;
class Fence;
class GraphicBuffer;
class IConsumerListener;
class NativeHandle;
class IGraphicBufferConsumer : public IInterface {
public:
enum {
// Returned by releaseBuffer, after which the consumer must
// free any references to the just-released buffer that it might have.
STALE_BUFFER_SLOT = 1,
// Returned by dequeueBuffer if there are no pending buffers available.
NO_BUFFER_AVAILABLE,
// Returned by dequeueBuffer if it's too early for the buffer to be acquired.
PRESENT_LATER,
};
// acquireBuffer attempts to acquire ownership of the next pending buffer in
// the BufferQueue. If no buffer is pending then it returns
// NO_BUFFER_AVAILABLE. If a buffer is successfully acquired, the
// information about the buffer is returned in BufferItem.
//
// If the buffer returned had previously been
// acquired then the BufferItem::mGraphicBuffer field of buffer is set to
// NULL and it is assumed that the consumer still holds a reference to the
// buffer.
//
// If presentWhen is non-zero, it indicates the time when the buffer will
// be displayed on screen. If the buffer's timestamp is farther in the
// future, the buffer won't be acquired, and PRESENT_LATER will be
// returned. The presentation time is in nanoseconds, and the time base
// is CLOCK_MONOTONIC.
//
// If maxFrameNumber is non-zero, it indicates that acquireBuffer should
// only return a buffer with a frame number less than or equal to
// maxFrameNumber. If no such frame is available (such as when a buffer has
// been replaced but the consumer has not received the onFrameReplaced
// callback), then PRESENT_LATER will be returned.
//
// Return of NO_ERROR means the operation completed as normal.
//
// Return of a positive value means the operation could not be completed
// at this time, but the user should try again later:
// * NO_BUFFER_AVAILABLE - no buffer is pending (nothing queued by producer)
// * PRESENT_LATER - the buffer's timestamp is farther in the future
//
// Return of a negative value means an error has occurred:
// * INVALID_OPERATION - too many buffers have been acquired
virtual status_t acquireBuffer(BufferItem* buffer, nsecs_t presentWhen,
uint64_t maxFrameNumber = 0) = 0;
// detachBuffer attempts to remove all ownership of the buffer in the given
// slot from the buffer queue. If this call succeeds, the slot will be
// freed, and there will be no way to obtain the buffer from this interface.
// The freed slot will remain unallocated until either it is selected to
// hold a freshly allocated buffer in dequeueBuffer or a buffer is attached
// to the slot. The buffer must have already been acquired.
//
// Return of a value other than NO_ERROR means an error has occurred:
// * BAD_VALUE - the given slot number is invalid, either because it is
// out of the range [0, NUM_BUFFER_SLOTS) or because the slot
// it refers to is not currently acquired.
virtual status_t detachBuffer(int slot) = 0;
// attachBuffer attempts to transfer ownership of a buffer to the buffer
// queue. If this call succeeds, it will be as if this buffer was acquired
// from the returned slot number. As such, this call will fail if attaching
// this buffer would cause too many buffers to be simultaneously acquired.
//
// If the buffer is successfully attached, its frameNumber is initialized
// to 0. This must be passed into the releaseBuffer call or else the buffer
// will be deallocated as stale.
//
// Return of a value other than NO_ERROR means an error has occurred:
// * BAD_VALUE - outSlot or buffer were NULL, or the generation number of
// the buffer did not match the buffer queue.
// * INVALID_OPERATION - cannot attach the buffer because it would cause too
// many buffers to be acquired.
// * NO_MEMORY - no free slots available
virtual status_t attachBuffer(int *outSlot,
const sp<GraphicBuffer>& buffer) = 0;
// releaseBuffer releases a buffer slot from the consumer back to the
// BufferQueue. This may be done while the buffer's contents are still
// being accessed. The fence will signal when the buffer is no longer
// in use. frameNumber is used to indentify the exact buffer returned.
//
// If releaseBuffer returns STALE_BUFFER_SLOT, then the consumer must free
// any references to the just-released buffer that it might have, as if it
// had received a onBuffersReleased() call with a mask set for the released
// buffer.
//
// Note that the dependencies on EGL will be removed once we switch to using
// the Android HW Sync HAL.
//
// Return of NO_ERROR means the operation completed as normal.
//
// Return of a positive value means the operation could not be completed
// at this time, but the user should try again later:
// * STALE_BUFFER_SLOT - see above (second paragraph)
//
// Return of a negative value means an error has occurred:
// * BAD_VALUE - one of the following could've happened:
// * the buffer slot was invalid
// * the fence was NULL
// * the buffer slot specified is not in the acquired state
virtual status_t releaseBuffer(int buf, uint64_t frameNumber,
EGLDisplay display, EGLSyncKHR fence,
const sp<Fence>& releaseFence) = 0;
// consumerConnect connects a consumer to the BufferQueue. Only one
// consumer may be connected, and when that consumer disconnects the
// BufferQueue is placed into the "abandoned" state, causing most
// interactions with the BufferQueue by the producer to fail.
// controlledByApp indicates whether the consumer is controlled by
// the application.
//
// consumer may not be NULL.
//
// Return of a value other than NO_ERROR means an error has occurred:
// * NO_INIT - the buffer queue has been abandoned
// * BAD_VALUE - a NULL consumer was provided
virtual status_t consumerConnect(const sp<IConsumerListener>& consumer, bool controlledByApp) = 0;
// consumerDisconnect disconnects a consumer from the BufferQueue. All
// buffers will be freed and the BufferQueue is placed in the "abandoned"
// state, causing most interactions with the BufferQueue by the producer to
// fail.
//
// Return of a value other than NO_ERROR means an error has occurred:
// * BAD_VALUE - no consumer is currently connected
virtual status_t consumerDisconnect() = 0;
// getReleasedBuffers sets the value pointed to by slotMask to a bit set.
// Each bit index with a 1 corresponds to a released buffer slot with that
// index value. In particular, a released buffer is one that has
// been released by the BufferQueue but have not yet been released by the consumer.
//
// This should be called from the onBuffersReleased() callback.
//
// Return of a value other than NO_ERROR means an error has occurred:
// * NO_INIT - the buffer queue has been abandoned.
virtual status_t getReleasedBuffers(uint64_t* slotMask) = 0;
// setDefaultBufferSize is used to set the size of buffers returned by
// dequeueBuffer when a width and height of zero is requested. Default
// is 1x1.
//
// Return of a value other than NO_ERROR means an error has occurred:
// * BAD_VALUE - either w or h was zero
virtual status_t setDefaultBufferSize(uint32_t w, uint32_t h) = 0;
// setMaxBufferCount sets the maximum value for the number of buffers used
// in the buffer queue (the initial default is NUM_BUFFER_SLOTS). If a call
// to setMaxAcquiredBufferCount (by the consumer), or a call to setAsyncMode
// or setMaxDequeuedBufferCount (by the producer), would cause this value to
// be exceeded then that call will fail. This call will fail if a producer
// is connected to the BufferQueue.
//
// The count must be between 1 and NUM_BUFFER_SLOTS, inclusive. The count
// cannot be less than maxAcquiredBufferCount.
//
// Return of a value other than NO_ERROR means an error has occurred:
// * BAD_VALUE - one of the below conditions occurred:
// * bufferCount was out of range (see above).
// * failure to adjust the number of available slots.
// * INVALID_OPERATION - attempting to call this after a producer connected.
virtual status_t setMaxBufferCount(int bufferCount) = 0;
// setMaxAcquiredBufferCount sets the maximum number of buffers that can
// be acquired by the consumer at one time (default 1). If this method
// succeeds, any new buffer slots will be both unallocated and owned by the
// BufferQueue object (i.e. they are not owned by the producer or consumer).
// Calling this may also cause some buffer slots to be emptied.
//
// This function should not be called with a value of maxAcquiredBuffers
// that is less than the number of currently acquired buffer slots. Doing so
// will result in a BAD_VALUE error.
//
// maxAcquiredBuffers must be (inclusive) between 1 and
// MAX_MAX_ACQUIRED_BUFFERS. It also cannot cause the maxBufferCount value
// to be exceeded.
//
// Return of a value other than NO_ERROR means an error has occurred:
// * NO_INIT - the buffer queue has been abandoned
// * BAD_VALUE - one of the below conditions occurred:
// * maxAcquiredBuffers was out of range (see above).
// * failure to adjust the number of available slots.
// * client would have more than the requested number of
// acquired buffers after this call
// * INVALID_OPERATION - attempting to call this after a producer connected.
virtual status_t setMaxAcquiredBufferCount(int maxAcquiredBuffers) = 0;
// setConsumerName sets the name used in logging
virtual void setConsumerName(const String8& name) = 0;
// setDefaultBufferFormat allows the BufferQueue to create
// GraphicBuffers of a defaultFormat if no format is specified
// in dequeueBuffer.
// The initial default is PIXEL_FORMAT_RGBA_8888.
//
// Return of a value other than NO_ERROR means an unknown error has occurred.
virtual status_t setDefaultBufferFormat(PixelFormat defaultFormat) = 0;
// setDefaultBufferDataSpace is a request to the producer to provide buffers
// of the indicated dataSpace. The producer may ignore this request.
// The initial default is HAL_DATASPACE_UNKNOWN.
//
// Return of a value other than NO_ERROR means an unknown error has occurred.
virtual status_t setDefaultBufferDataSpace(
android_dataspace defaultDataSpace) = 0;
// setConsumerUsageBits will turn on additional usage bits for dequeueBuffer.
// These are merged with the bits passed to dequeueBuffer. The values are
// enumerated in gralloc.h, e.g. GRALLOC_USAGE_HW_RENDER; the default is 0.
//
// Return of a value other than NO_ERROR means an unknown error has occurred.
virtual status_t setConsumerUsageBits(uint32_t usage) = 0;
// setTransformHint bakes in rotation to buffers so overlays can be used.
// The values are enumerated in window.h, e.g.
// NATIVE_WINDOW_TRANSFORM_ROT_90. The default is 0 (no transform).
//
// Return of a value other than NO_ERROR means an unknown error has occurred.
virtual status_t setTransformHint(uint32_t hint) = 0;
// Retrieve the sideband buffer stream, if any.
virtual sp<NativeHandle> getSidebandStream() const = 0;
// discardFreeBuffers releases all currently-free buffers held by the queue,
// in order to reduce the memory consumption of the queue to the minimum
// possible without discarding data.
virtual status_t discardFreeBuffers() = 0;
// dump state into a string
virtual void dump(String8& result, const char* prefix) const = 0;
public:
DECLARE_META_INTERFACE(GraphicBufferConsumer);
};
// ----------------------------------------------------------------------------
class BnGraphicBufferConsumer : public BnInterface<IGraphicBufferConsumer>
{
public:
virtual status_t onTransact( uint32_t code,
const Parcel& data,
Parcel* reply,
uint32_t flags = 0);
};
// ----------------------------------------------------------------------------
}; // namespace android
#endif // ANDROID_GUI_IGRAPHICBUFFERCONSUMER_H