224 lines
9.4 KiB
C++
224 lines
9.4 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_GUI_IGRAPHICBUFFERPRODUCER_H
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#define ANDROID_GUI_IGRAPHICBUFFERPRODUCER_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <utils/Errors.h>
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#include <utils/RefBase.h>
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#include <binder/IInterface.h>
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#include <ui/Fence.h>
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#include <ui/GraphicBuffer.h>
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#include <ui/Rect.h>
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namespace android {
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// ----------------------------------------------------------------------------
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class Surface;
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/*
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* This class defines the Binder IPC interface for the producer side of
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* a queue of graphics buffers. It's used to send graphics data from one
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* component to another. For example, a class that decodes video for
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* playback might use this to provide frames. This is typically done
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* indirectly, through Surface.
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*
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* The underlying mechanism is a BufferQueue, which implements
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* BnGraphicBufferProducer. In normal operation, the producer calls
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* dequeueBuffer() to get an empty buffer, fills it with data, then
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* calls queueBuffer() to make it available to the consumer.
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*
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* This class was previously called ISurfaceTexture.
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*/
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class IGraphicBufferProducer : public IInterface
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{
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public:
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DECLARE_META_INTERFACE(GraphicBufferProducer);
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enum {
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BUFFER_NEEDS_REALLOCATION = 0x1,
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RELEASE_ALL_BUFFERS = 0x2,
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};
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// requestBuffer requests a new buffer for the given index. The server (i.e.
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// the IGraphicBufferProducer implementation) assigns the newly created
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// buffer to the given slot index, and the client is expected to mirror the
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// slot->buffer mapping so that it's not necessary to transfer a
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// GraphicBuffer for every dequeue operation.
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virtual status_t requestBuffer(int slot, sp<GraphicBuffer>* buf) = 0;
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// setBufferCount sets the number of buffer slots available. Calling this
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// will also cause all buffer slots to be emptied. The caller should empty
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// its mirrored copy of the buffer slots when calling this method.
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virtual status_t setBufferCount(int bufferCount) = 0;
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// dequeueBuffer requests a new buffer slot for the client to use. Ownership
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// of the slot is transfered to the client, meaning that the server will not
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// use the contents of the buffer associated with that slot. The slot index
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// returned may or may not contain a buffer. If the slot is empty the client
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// should call requestBuffer to assign a new buffer to that slot. The client
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// is expected to either call cancelBuffer on the dequeued slot or to fill
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// in the contents of its associated buffer contents and call queueBuffer.
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// If dequeueBuffer return BUFFER_NEEDS_REALLOCATION, the client is
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// expected to call requestBuffer immediately.
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//
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// The fence parameter will be updated to hold the fence associated with
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// the buffer. The contents of the buffer must not be overwritten until the
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// fence signals. If the fence is NULL, the buffer may be written
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// immediately.
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//
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// The async parameter sets whether we're in asynchrnous mode for this
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// deququeBuffer() call.
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virtual status_t dequeueBuffer(int *slot, sp<Fence>* fence, bool async,
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uint32_t w, uint32_t h, uint32_t format, uint32_t usage) = 0;
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// queueBuffer indicates that the client has finished filling in the
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// contents of the buffer associated with slot and transfers ownership of
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// that slot back to the server. It is not valid to call queueBuffer on a
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// slot that is not owned by the client or one for which a buffer associated
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// via requestBuffer. In addition, a timestamp must be provided by the
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// client for this buffer. The timestamp is measured in nanoseconds, and
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// must be monotonically increasing. Its other properties (zero point, etc)
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// are client-dependent, and should be documented by the client.
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//
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// The async parameter sets whether we're queuing a buffer in asynchronous mode.
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//
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// outWidth, outHeight and outTransform are filled with the default width
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// and height of the window and current transform applied to buffers,
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// respectively.
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struct QueueBufferInput : public Flattenable<QueueBufferInput> {
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friend class Flattenable<QueueBufferInput>;
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inline QueueBufferInput(const Parcel& parcel);
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inline QueueBufferInput(int64_t timestamp, bool isAutoTimestamp,
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const Rect& crop, int scalingMode, uint32_t transform, bool async,
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const sp<Fence>& fence)
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: timestamp(timestamp), isAutoTimestamp(isAutoTimestamp), crop(crop),
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scalingMode(scalingMode), transform(transform), async(async),
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fence(fence) { }
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inline void deflate(int64_t* outTimestamp, bool* outIsAutoTimestamp,
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Rect* outCrop, int* outScalingMode, uint32_t* outTransform,
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bool* outAsync, sp<Fence>* outFence) const {
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*outTimestamp = timestamp;
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*outIsAutoTimestamp = bool(isAutoTimestamp);
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*outCrop = crop;
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*outScalingMode = scalingMode;
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*outTransform = transform;
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*outAsync = bool(async);
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*outFence = fence;
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}
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// Flattenable protocol
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size_t getFlattenedSize() const;
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size_t getFdCount() const;
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status_t flatten(void*& buffer, size_t& size, int*& fds, size_t& count) const;
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status_t unflatten(void const*& buffer, size_t& size, int const*& fds, size_t& count);
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private:
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int64_t timestamp;
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int isAutoTimestamp;
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Rect crop;
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int scalingMode;
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uint32_t transform;
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int async;
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sp<Fence> fence;
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};
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// QueueBufferOutput must be a POD structure
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struct QueueBufferOutput {
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inline QueueBufferOutput() { }
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inline void deflate(uint32_t* outWidth,
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uint32_t* outHeight,
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uint32_t* outTransformHint,
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uint32_t* outNumPendingBuffers) const {
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*outWidth = width;
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*outHeight = height;
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*outTransformHint = transformHint;
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*outNumPendingBuffers = numPendingBuffers;
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}
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inline void inflate(uint32_t inWidth, uint32_t inHeight,
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uint32_t inTransformHint, uint32_t inNumPendingBuffers) {
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width = inWidth;
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height = inHeight;
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transformHint = inTransformHint;
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numPendingBuffers = inNumPendingBuffers;
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}
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private:
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uint32_t width;
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uint32_t height;
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uint32_t transformHint;
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uint32_t numPendingBuffers;
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};
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virtual status_t queueBuffer(int slot,
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const QueueBufferInput& input, QueueBufferOutput* output) = 0;
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// cancelBuffer indicates that the client does not wish to fill in the
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// buffer associated with slot and transfers ownership of the slot back to
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// the server.
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virtual void cancelBuffer(int slot, const sp<Fence>& fence) = 0;
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// query retrieves some information for this surface
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// 'what' tokens allowed are that of android_natives.h
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virtual int query(int what, int* value) = 0;
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// connect attempts to connect a client API to the IGraphicBufferProducer.
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// This must be called before any other IGraphicBufferProducer methods are
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// called except for getAllocator.
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//
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// This method will fail if the connect was previously called on the
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// IGraphicBufferProducer and no corresponding disconnect call was made.
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//
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// outWidth, outHeight and outTransform are filled with the default width
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// and height of the window and current transform applied to buffers,
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// respectively. The token needs to be any binder object that lives in the
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// producer process -- it is solely used for obtaining a death notification
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// when the producer is killed.
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virtual status_t connect(const sp<IBinder>& token,
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int api, bool producerControlledByApp, QueueBufferOutput* output) = 0;
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// disconnect attempts to disconnect a client API from the
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// IGraphicBufferProducer. Calling this method will cause any subsequent
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// calls to other IGraphicBufferProducer methods to fail except for
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// getAllocator and connect. Successfully calling connect after this will
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// allow the other methods to succeed again.
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//
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// This method will fail if the the IGraphicBufferProducer is not currently
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// connected to the specified client API.
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virtual status_t disconnect(int api) = 0;
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};
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// ----------------------------------------------------------------------------
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class BnGraphicBufferProducer : public BnInterface<IGraphicBufferProducer>
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{
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public:
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virtual status_t onTransact( uint32_t code,
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const Parcel& data,
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Parcel* reply,
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uint32_t flags = 0);
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};
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// ----------------------------------------------------------------------------
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}; // namespace android
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#endif // ANDROID_GUI_IGRAPHICBUFFERPRODUCER_H
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