/* * Copyright (C) 2012 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_BUFFERQUEUE_H #define ANDROID_GUI_BUFFERQUEUE_H #include #include #include // These are only required to keep other parts of the framework with incomplete // dependencies building successfully #include #include namespace android { // BQProducer and BQConsumer are thin shim classes to allow methods with the // same signature in both IGraphicBufferProducer and IGraphicBufferConsumer. // This will stop being an issue when we deprecate creating BufferQueues // directly (as opposed to using the *Producer and *Consumer interfaces). class BQProducer : public BnGraphicBufferProducer { public: virtual status_t detachProducerBuffer(int slot) = 0; virtual status_t attachProducerBuffer(int* slot, const sp& buffer) = 0; virtual status_t detachBuffer(int slot) { return detachProducerBuffer(slot); } virtual status_t attachBuffer(int* slot, const sp& buffer) { return attachProducerBuffer(slot, buffer); } }; class BQConsumer : public BnGraphicBufferConsumer { public: virtual status_t detachConsumerBuffer(int slot) = 0; virtual status_t attachConsumerBuffer(int* slot, const sp& buffer) = 0; virtual status_t detachBuffer(int slot) { return detachConsumerBuffer(slot); } virtual status_t attachBuffer(int* slot, const sp& buffer) { return attachConsumerBuffer(slot, buffer); } }; class BufferQueue : public BQProducer, public BQConsumer, private IBinder::DeathRecipient { public: // BufferQueue will keep track of at most this value of buffers. // Attempts at runtime to increase the number of buffers past this will fail. enum { NUM_BUFFER_SLOTS = 32 }; // Used as a placeholder slot# when the value isn't pointing to an existing buffer. enum { INVALID_BUFFER_SLOT = IGraphicBufferConsumer::BufferItem::INVALID_BUFFER_SLOT }; // Alias to -- please scope from there in future code! enum { NO_BUFFER_AVAILABLE = IGraphicBufferConsumer::NO_BUFFER_AVAILABLE, PRESENT_LATER = IGraphicBufferConsumer::PRESENT_LATER, }; // When in async mode we reserve two slots in order to guarantee that the // producer and consumer can run asynchronously. enum { MAX_MAX_ACQUIRED_BUFFERS = NUM_BUFFER_SLOTS - 2 }; // for backward source compatibility typedef ::android::ConsumerListener ConsumerListener; // ProxyConsumerListener is a ConsumerListener implementation that keeps a weak // reference to the actual consumer object. It forwards all calls to that // consumer object so long as it exists. // // This class exists to avoid having a circular reference between the // BufferQueue object and the consumer object. The reason this can't be a weak // reference in the BufferQueue class is because we're planning to expose the // consumer side of a BufferQueue as a binder interface, which doesn't support // weak references. class ProxyConsumerListener : public BnConsumerListener { public: ProxyConsumerListener(const wp& consumerListener); virtual ~ProxyConsumerListener(); virtual void onFrameAvailable(); virtual void onBuffersReleased(); virtual void onSidebandStreamChanged(); private: // mConsumerListener is a weak reference to the IConsumerListener. This is // the raison d'etre of ProxyConsumerListener. wp mConsumerListener; }; // BufferQueue manages a pool of gralloc memory slots to be used by // producers and consumers. allocator is used to allocate all the // needed gralloc buffers. BufferQueue(const sp& allocator = NULL); static void createBufferQueue(sp* outProducer, sp* outConsumer, const sp& allocator = NULL); virtual ~BufferQueue(); /* * IBinder::DeathRecipient interface */ virtual void binderDied(const wp& who); /* * IGraphicBufferProducer interface */ // Query native window attributes. The "what" values are enumerated in // window.h (e.g. NATIVE_WINDOW_FORMAT). virtual int query(int what, int* value); // setBufferCount updates the number of available buffer slots. If this // method succeeds, buffer slots will be both unallocated and owned by // the BufferQueue object (i.e. they are not owned by the producer or // consumer). // // This will fail if the producer has dequeued any buffers, or if // bufferCount is invalid. bufferCount must generally be a value // between the minimum undequeued buffer count (exclusive) and NUM_BUFFER_SLOTS // (inclusive). It may also be set to zero (the default) to indicate // that the producer does not wish to set a value. The minimum value // can be obtained by calling query(NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS, // ...). // // This may only be called by the producer. The consumer will be told // to discard buffers through the onBuffersReleased callback. virtual status_t setBufferCount(int bufferCount); // requestBuffer returns the GraphicBuffer for slot N. // // In normal operation, this is called the first time slot N is returned // by dequeueBuffer. It must be called again if dequeueBuffer returns // flags indicating that previously-returned buffers are no longer valid. virtual status_t requestBuffer(int slot, sp* buf); // dequeueBuffer gets the next buffer slot index for the producer to use. // If a buffer slot is available then that slot index is written to the // location pointed to by the buf argument and a status of OK is returned. // If no slot is available then a status of -EBUSY is returned and buf is // unmodified. // // The fence parameter will be updated to hold the fence associated with // the buffer. The contents of the buffer must not be overwritten until the // fence signals. If the fence is Fence::NO_FENCE, the buffer may be // written immediately. // // The width and height parameters must be no greater than the minimum of // GL_MAX_VIEWPORT_DIMS and GL_MAX_TEXTURE_SIZE (see: glGetIntegerv). // An error due to invalid dimensions might not be reported until // updateTexImage() is called. If width and height are both zero, the // default values specified by setDefaultBufferSize() are used instead. // // The pixel formats are enumerated in graphics.h, e.g. // HAL_PIXEL_FORMAT_RGBA_8888. If the format is 0, the default format // will be used. // // The usage argument specifies gralloc buffer usage flags. The values // are enumerated in gralloc.h, e.g. GRALLOC_USAGE_HW_RENDER. These // will be merged with the usage flags specified by setConsumerUsageBits. // // The return value may be a negative error value or a non-negative // collection of flags. If the flags are set, the return values are // valid, but additional actions must be performed. // // If IGraphicBufferProducer::BUFFER_NEEDS_REALLOCATION is set, the // producer must discard cached GraphicBuffer references for the slot // returned in buf. // If IGraphicBufferProducer::RELEASE_ALL_BUFFERS is set, the producer // must discard cached GraphicBuffer references for all slots. // // In both cases, the producer will need to call requestBuffer to get a // GraphicBuffer handle for the returned slot. virtual status_t dequeueBuffer(int *buf, sp* fence, bool async, uint32_t width, uint32_t height, uint32_t format, uint32_t usage); // See IGraphicBufferProducer::detachBuffer virtual status_t detachProducerBuffer(int slot); // See IGraphicBufferProducer::attachBuffer virtual status_t attachProducerBuffer(int* slot, const sp& buffer); // queueBuffer returns a filled buffer to the BufferQueue. // // Additional data is provided in the QueueBufferInput struct. Notably, // a timestamp must be provided for the buffer. The timestamp is in // nanoseconds, and must be monotonically increasing. Its other semantics // (zero point, etc) are producer-specific and should be documented by the // producer. // // The caller may provide a fence that signals when all rendering // operations have completed. Alternatively, NO_FENCE may be used, // indicating that the buffer is ready immediately. // // Some values are returned in the output struct: the current settings // for default width and height, the current transform hint, and the // number of queued buffers. virtual status_t queueBuffer(int buf, const QueueBufferInput& input, QueueBufferOutput* output); // cancelBuffer returns a dequeued buffer to the BufferQueue, but doesn't // queue it for use by the consumer. // // The buffer will not be overwritten until the fence signals. The fence // will usually be the one obtained from dequeueBuffer. virtual void cancelBuffer(int buf, const sp& fence); // See IGraphicBufferProducer::connect virtual status_t connect(const sp& listener, int api, bool producerControlledByApp, QueueBufferOutput* output); // disconnect attempts to disconnect a producer API from the BufferQueue. // Calling this method will cause any subsequent calls to other // IGraphicBufferProducer methods to fail except for getAllocator and connect. // Successfully calling connect after this will allow the other methods to // succeed again. // // This method will fail if the the BufferQueue is not currently // connected to the specified producer API. virtual status_t disconnect(int api); // Attaches a sideband buffer stream to the BufferQueue. // // 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. virtual status_t setSidebandStream(const sp& stream); /* * IGraphicBufferConsumer interface */ // 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 nonzero, 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. virtual status_t acquireBuffer(BufferItem* buffer, nsecs_t presentWhen); // See IGraphicBufferConsumer::detachBuffer virtual status_t detachConsumerBuffer(int slot); // See IGraphicBufferConsumer::attachBuffer virtual status_t attachConsumerBuffer(int* slot, const sp& buffer); // 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. virtual status_t releaseBuffer(int buf, uint64_t frameNumber, EGLDisplay display, EGLSyncKHR fence, const sp& releaseFence); // 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. virtual status_t consumerConnect(const sp& consumer, bool controlledByApp); // 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. virtual status_t consumerDisconnect(); // getReleasedBuffers sets the value pointed to by slotMask to a bit mask // indicating which buffer slots have been released by the BufferQueue // but have not yet been released by the consumer. // // This should be called from the onBuffersReleased() callback. virtual status_t getReleasedBuffers(uint32_t* slotMask); // setDefaultBufferSize is used to set the size of buffers returned by // dequeueBuffer when a width and height of zero is requested. Default // is 1x1. virtual status_t setDefaultBufferSize(uint32_t w, uint32_t h); // setDefaultMaxBufferCount sets the default value for the maximum buffer // count (the initial default is 2). If the producer has requested a // buffer count using setBufferCount, the default buffer count will only // take effect if the producer sets the count back to zero. // // The count must be between 2 and NUM_BUFFER_SLOTS, inclusive. virtual status_t setDefaultMaxBufferCount(int bufferCount); // disableAsyncBuffer disables the extra buffer used in async mode // (when both producer and consumer have set their "isControlledByApp" // flag) and has dequeueBuffer() return WOULD_BLOCK instead. // // This can only be called before consumerConnect(). virtual status_t disableAsyncBuffer(); // setMaxAcquiredBufferCount sets the maximum number of buffers that can // be acquired by the consumer at one time (default 1). This call will // fail if a producer is connected to the BufferQueue. virtual status_t setMaxAcquiredBufferCount(int maxAcquiredBuffers); // setConsumerName sets the name used in logging virtual void setConsumerName(const String8& name); // setDefaultBufferFormat allows the BufferQueue to create // GraphicBuffers of a defaultFormat if no format is specified // in dequeueBuffer. Formats are enumerated in graphics.h; the // initial default is HAL_PIXEL_FORMAT_RGBA_8888. virtual status_t setDefaultBufferFormat(uint32_t defaultFormat); // 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. virtual status_t setConsumerUsageBits(uint32_t usage); // 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). virtual status_t setTransformHint(uint32_t hint); // Retrieve the BufferQueue's sideband stream, if any. virtual sp getSidebandStream() const; // dump our state in a String virtual void dump(String8& result, const char* prefix) const; private: sp mProducer; sp mConsumer; }; // ---------------------------------------------------------------------------- }; // namespace android #endif // ANDROID_GUI_BUFFERQUEUE_H