1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_GUI_IGRAPHICBUFFERPRODUCER_H 18 #define ANDROID_GUI_IGRAPHICBUFFERPRODUCER_H 19 20 #include <stdint.h> 21 #include <sys/types.h> 22 23 #include <utils/Errors.h> 24 #include <utils/RefBase.h> 25 26 #include <binder/IInterface.h> 27 28 #include <ui/Fence.h> 29 #include <ui/GraphicBuffer.h> 30 #include <ui/Rect.h> 31 32 namespace android { 33 // ---------------------------------------------------------------------------- 34 35 class Surface; 36 37 /* 38 * This class defines the Binder IPC interface for the producer side of 39 * a queue of graphics buffers. It's used to send graphics data from one 40 * component to another. For example, a class that decodes video for 41 * playback might use this to provide frames. This is typically done 42 * indirectly, through Surface. 43 * 44 * The underlying mechanism is a BufferQueue, which implements 45 * BnGraphicBufferProducer. In normal operation, the producer calls 46 * dequeueBuffer() to get an empty buffer, fills it with data, then 47 * calls queueBuffer() to make it available to the consumer. 48 * 49 * This class was previously called ISurfaceTexture. 50 */ 51 class IGraphicBufferProducer : public IInterface 52 { 53 public: 54 DECLARE_META_INTERFACE(GraphicBufferProducer); 55 56 enum { 57 BUFFER_NEEDS_REALLOCATION = 0x1, 58 RELEASE_ALL_BUFFERS = 0x2, 59 }; 60 61 // requestBuffer requests a new buffer for the given index. The server (i.e. 62 // the IGraphicBufferProducer implementation) assigns the newly created 63 // buffer to the given slot index, and the client is expected to mirror the 64 // slot->buffer mapping so that it's not necessary to transfer a 65 // GraphicBuffer for every dequeue operation. 66 virtual status_t requestBuffer(int slot, sp<GraphicBuffer>* buf) = 0; 67 68 // setBufferCount sets the number of buffer slots available. Calling this 69 // will also cause all buffer slots to be emptied. The caller should empty 70 // its mirrored copy of the buffer slots when calling this method. 71 virtual status_t setBufferCount(int bufferCount) = 0; 72 73 // dequeueBuffer requests a new buffer slot for the client to use. Ownership 74 // of the slot is transfered to the client, meaning that the server will not 75 // use the contents of the buffer associated with that slot. The slot index 76 // returned may or may not contain a buffer. If the slot is empty the client 77 // should call requestBuffer to assign a new buffer to that slot. The client 78 // is expected to either call cancelBuffer on the dequeued slot or to fill 79 // in the contents of its associated buffer contents and call queueBuffer. 80 // If dequeueBuffer return BUFFER_NEEDS_REALLOCATION, the client is 81 // expected to call requestBuffer immediately. 82 // 83 // The fence parameter will be updated to hold the fence associated with 84 // the buffer. The contents of the buffer must not be overwritten until the 85 // fence signals. If the fence is NULL, the buffer may be written 86 // immediately. 87 // 88 // The async parameter sets whether we're in asynchrnous mode for this 89 // deququeBuffer() call. 90 virtual status_t dequeueBuffer(int *slot, sp<Fence>* fence, bool async, 91 uint32_t w, uint32_t h, uint32_t format, uint32_t usage) = 0; 92 93 // queueBuffer indicates that the client has finished filling in the 94 // contents of the buffer associated with slot and transfers ownership of 95 // that slot back to the server. It is not valid to call queueBuffer on a 96 // slot that is not owned by the client or one for which a buffer associated 97 // via requestBuffer. In addition, a timestamp must be provided by the 98 // client for this buffer. The timestamp is measured in nanoseconds, and 99 // must be monotonically increasing. Its other properties (zero point, etc) 100 // are client-dependent, and should be documented by the client. 101 // 102 // The async parameter sets whether we're queuing a buffer in asynchronous mode. 103 // 104 // outWidth, outHeight and outTransform are filled with the default width 105 // and height of the window and current transform applied to buffers, 106 // respectively. 107 108 struct QueueBufferInput : public Flattenable<QueueBufferInput> { 109 friend class Flattenable<QueueBufferInput>; 110 inline QueueBufferInput(const Parcel& parcel); QueueBufferInputQueueBufferInput111 inline QueueBufferInput(int64_t timestamp, bool isAutoTimestamp, 112 const Rect& crop, int scalingMode, uint32_t transform, bool async, 113 const sp<Fence>& fence) 114 : timestamp(timestamp), isAutoTimestamp(isAutoTimestamp), crop(crop), 115 scalingMode(scalingMode), transform(transform), async(async), 116 fence(fence) { } deflateQueueBufferInput117 inline void deflate(int64_t* outTimestamp, bool* outIsAutoTimestamp, 118 Rect* outCrop, int* outScalingMode, uint32_t* outTransform, 119 bool* outAsync, sp<Fence>* outFence) const { 120 *outTimestamp = timestamp; 121 *outIsAutoTimestamp = bool(isAutoTimestamp); 122 *outCrop = crop; 123 *outScalingMode = scalingMode; 124 *outTransform = transform; 125 *outAsync = bool(async); 126 *outFence = fence; 127 } 128 129 // Flattenable protocol 130 size_t getFlattenedSize() const; 131 size_t getFdCount() const; 132 status_t flatten(void*& buffer, size_t& size, int*& fds, size_t& count) const; 133 status_t unflatten(void const*& buffer, size_t& size, int const*& fds, size_t& count); 134 135 private: 136 int64_t timestamp; 137 int isAutoTimestamp; 138 Rect crop; 139 int scalingMode; 140 uint32_t transform; 141 int async; 142 sp<Fence> fence; 143 }; 144 145 // QueueBufferOutput must be a POD structure 146 struct QueueBufferOutput { QueueBufferOutputQueueBufferOutput147 inline QueueBufferOutput() { } deflateQueueBufferOutput148 inline void deflate(uint32_t* outWidth, 149 uint32_t* outHeight, 150 uint32_t* outTransformHint, 151 uint32_t* outNumPendingBuffers) const { 152 *outWidth = width; 153 *outHeight = height; 154 *outTransformHint = transformHint; 155 *outNumPendingBuffers = numPendingBuffers; 156 } inflateQueueBufferOutput157 inline void inflate(uint32_t inWidth, uint32_t inHeight, 158 uint32_t inTransformHint, uint32_t inNumPendingBuffers) { 159 width = inWidth; 160 height = inHeight; 161 transformHint = inTransformHint; 162 numPendingBuffers = inNumPendingBuffers; 163 } 164 private: 165 uint32_t width; 166 uint32_t height; 167 uint32_t transformHint; 168 uint32_t numPendingBuffers; 169 }; 170 171 virtual status_t queueBuffer(int slot, 172 const QueueBufferInput& input, QueueBufferOutput* output) = 0; 173 174 // cancelBuffer indicates that the client does not wish to fill in the 175 // buffer associated with slot and transfers ownership of the slot back to 176 // the server. 177 virtual void cancelBuffer(int slot, const sp<Fence>& fence) = 0; 178 179 // query retrieves some information for this surface 180 // 'what' tokens allowed are that of android_natives.h 181 virtual int query(int what, int* value) = 0; 182 183 // connect attempts to connect a client API to the IGraphicBufferProducer. 184 // This must be called before any other IGraphicBufferProducer methods are 185 // called except for getAllocator. 186 // 187 // This method will fail if the connect was previously called on the 188 // IGraphicBufferProducer and no corresponding disconnect call was made. 189 // 190 // outWidth, outHeight and outTransform are filled with the default width 191 // and height of the window and current transform applied to buffers, 192 // respectively. The token needs to be any binder object that lives in the 193 // producer process -- it is solely used for obtaining a death notification 194 // when the producer is killed. 195 virtual status_t connect(const sp<IBinder>& token, 196 int api, bool producerControlledByApp, QueueBufferOutput* output) = 0; 197 198 // disconnect attempts to disconnect a client API from the 199 // IGraphicBufferProducer. Calling this method will cause any subsequent 200 // calls to other IGraphicBufferProducer methods to fail except for 201 // getAllocator and connect. Successfully calling connect after this will 202 // allow the other methods to succeed again. 203 // 204 // This method will fail if the the IGraphicBufferProducer is not currently 205 // connected to the specified client API. 206 virtual status_t disconnect(int api) = 0; 207 }; 208 209 // ---------------------------------------------------------------------------- 210 211 class BnGraphicBufferProducer : public BnInterface<IGraphicBufferProducer> 212 { 213 public: 214 virtual status_t onTransact( uint32_t code, 215 const Parcel& data, 216 Parcel* reply, 217 uint32_t flags = 0); 218 }; 219 220 // ---------------------------------------------------------------------------- 221 }; // namespace android 222 223 #endif // ANDROID_GUI_IGRAPHICBUFFERPRODUCER_H 224