IGraphicBufferConsumer.h revision 7d2d160cdc3cba9f4454f38433c94b68376cb843
1/* 2 * Copyright (C) 2013 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_IGRAPHICBUFFERCONSUMER_H 18#define ANDROID_GUI_IGRAPHICBUFFERCONSUMER_H 19 20#include <stdint.h> 21#include <sys/types.h> 22 23#include <utils/Errors.h> 24#include <utils/RefBase.h> 25#include <utils/Timers.h> 26 27#include <binder/IInterface.h> 28#include <ui/Rect.h> 29 30namespace android { 31// ---------------------------------------------------------------------------- 32 33class IConsumerListener; 34class GraphicBuffer; 35class Fence; 36 37class IGraphicBufferConsumer : public IInterface { 38 39public: 40 41 // public facing structure for BufferSlot 42 class BufferItem : public Flattenable<BufferItem> { 43 friend class Flattenable<BufferItem>; 44 size_t getPodSize() const; 45 size_t getFlattenedSize() const; 46 size_t getFdCount() const; 47 status_t flatten(void*& buffer, size_t& size, int*& fds, size_t& count) const; 48 status_t unflatten(void const*& buffer, size_t& size, int const*& fds, size_t& count); 49 50 public: 51 // The default value of mBuf, used to indicate this doesn't correspond to a slot. 52 enum { INVALID_BUFFER_SLOT = -1 }; 53 BufferItem(); 54 55 // mGraphicBuffer points to the buffer allocated for this slot, or is NULL 56 // if the buffer in this slot has been acquired in the past (see 57 // BufferSlot.mAcquireCalled). 58 sp<GraphicBuffer> mGraphicBuffer; 59 60 // mFence is a fence that will signal when the buffer is idle. 61 sp<Fence> mFence; 62 63 // mCrop is the current crop rectangle for this buffer slot. 64 Rect mCrop; 65 66 // mTransform is the current transform flags for this buffer slot. 67 // refer to NATIVE_WINDOW_TRANSFORM_* in <window.h> 68 uint32_t mTransform; 69 70 // mScalingMode is the current scaling mode for this buffer slot. 71 // refer to NATIVE_WINDOW_SCALING_* in <window.h> 72 uint32_t mScalingMode; 73 74 // mTimestamp is the current timestamp for this buffer slot. This gets 75 // to set by queueBuffer each time this slot is queued. This value 76 // is guaranteed to be monotonically increasing for each newly 77 // acquired buffer. 78 int64_t mTimestamp; 79 80 // mIsAutoTimestamp indicates whether mTimestamp was generated 81 // automatically when the buffer was queued. 82 bool mIsAutoTimestamp; 83 84 // mFrameNumber is the number of the queued frame for this slot. 85 uint64_t mFrameNumber; 86 87 // mBuf is the slot index of this buffer (default INVALID_BUFFER_SLOT). 88 int mBuf; 89 90 // mIsDroppable whether this buffer was queued with the 91 // property that it can be replaced by a new buffer for the purpose of 92 // making sure dequeueBuffer() won't block. 93 // i.e.: was the BufferQueue in "mDequeueBufferCannotBlock" when this buffer 94 // was queued. 95 bool mIsDroppable; 96 97 // Indicates whether this buffer has been seen by a consumer yet 98 bool mAcquireCalled; 99 100 // Indicates this buffer must be transformed by the inverse transform of the screen 101 // it is displayed onto. This is applied after mTransform. 102 bool mTransformToDisplayInverse; 103 }; 104 105 enum { 106 // Returned by releaseBuffer, after which the consumer must 107 // free any references to the just-released buffer that it might have. 108 STALE_BUFFER_SLOT = 1, 109 // Returned by dequeueBuffer if there are no pending buffers available. 110 NO_BUFFER_AVAILABLE, 111 // Returned by dequeueBuffer if it's too early for the buffer to be acquired. 112 PRESENT_LATER, 113 }; 114 115 // acquireBuffer attempts to acquire ownership of the next pending buffer in 116 // the BufferQueue. If no buffer is pending then it returns 117 // NO_BUFFER_AVAILABLE. If a buffer is successfully acquired, the 118 // information about the buffer is returned in BufferItem. 119 // 120 // If the buffer returned had previously been 121 // acquired then the BufferItem::mGraphicBuffer field of buffer is set to 122 // NULL and it is assumed that the consumer still holds a reference to the 123 // buffer. 124 // 125 // If presentWhen is non-zero, it indicates the time when the buffer will 126 // be displayed on screen. If the buffer's timestamp is farther in the 127 // future, the buffer won't be acquired, and PRESENT_LATER will be 128 // returned. The presentation time is in nanoseconds, and the time base 129 // is CLOCK_MONOTONIC. 130 // 131 // Return of NO_ERROR means the operation completed as normal. 132 // 133 // Return of a positive value means the operation could not be completed 134 // at this time, but the user should try again later: 135 // * NO_BUFFER_AVAILABLE - no buffer is pending (nothing queued by producer) 136 // * PRESENT_LATER - the buffer's timestamp is farther in the future 137 // 138 // Return of a negative value means an error has occurred: 139 // * INVALID_OPERATION - too many buffers have been acquired 140 virtual status_t acquireBuffer(BufferItem* buffer, nsecs_t presentWhen) = 0; 141 142 // releaseBuffer releases a buffer slot from the consumer back to the 143 // BufferQueue. This may be done while the buffer's contents are still 144 // being accessed. The fence will signal when the buffer is no longer 145 // in use. frameNumber is used to indentify the exact buffer returned. 146 // 147 // If releaseBuffer returns STALE_BUFFER_SLOT, then the consumer must free 148 // any references to the just-released buffer that it might have, as if it 149 // had received a onBuffersReleased() call with a mask set for the released 150 // buffer. 151 // 152 // Note that the dependencies on EGL will be removed once we switch to using 153 // the Android HW Sync HAL. 154 // 155 // Return of NO_ERROR means the operation completed as normal. 156 // 157 // Return of a positive value means the operation could not be completed 158 // at this time, but the user should try again later: 159 // * STALE_BUFFER_SLOT - see above (second paragraph) 160 // 161 // Return of a negative value means an error has occurred: 162 // * BAD_VALUE - one of the following could've happened: 163 // * the buffer slot was invalid 164 // * the fence was NULL 165 // * the buffer slot specified is not in the acquired state 166 virtual status_t releaseBuffer(int buf, uint64_t frameNumber, 167 EGLDisplay display, EGLSyncKHR fence, 168 const sp<Fence>& releaseFence) = 0; 169 170 // consumerConnect connects a consumer to the BufferQueue. Only one 171 // consumer may be connected, and when that consumer disconnects the 172 // BufferQueue is placed into the "abandoned" state, causing most 173 // interactions with the BufferQueue by the producer to fail. 174 // controlledByApp indicates whether the consumer is controlled by 175 // the application. 176 // 177 // consumer may not be NULL. 178 // 179 // Return of a value other than NO_ERROR means an error has occurred: 180 // * NO_INIT - the buffer queue has been abandoned 181 // * BAD_VALUE - a NULL consumer was provided 182 virtual status_t consumerConnect(const sp<IConsumerListener>& consumer, bool controlledByApp) = 0; 183 184 // consumerDisconnect disconnects a consumer from the BufferQueue. All 185 // buffers will be freed and the BufferQueue is placed in the "abandoned" 186 // state, causing most interactions with the BufferQueue by the producer to 187 // fail. 188 // 189 // Return of a value other than NO_ERROR means an error has occurred: 190 // * BAD_VALUE - no consumer is currently connected 191 virtual status_t consumerDisconnect() = 0; 192 193 // getReleasedBuffers sets the value pointed to by slotMask to a bit set. 194 // Each bit index with a 1 corresponds to a released buffer slot with that 195 // index value. In particular, a released buffer is one that has 196 // been released by the BufferQueue but have not yet been released by the consumer. 197 // 198 // This should be called from the onBuffersReleased() callback. 199 // 200 // Return of a value other than NO_ERROR means an error has occurred: 201 // * NO_INIT - the buffer queue has been abandoned. 202 virtual status_t getReleasedBuffers(uint32_t* slotMask) = 0; 203 204 // setDefaultBufferSize is used to set the size of buffers returned by 205 // dequeueBuffer when a width and height of zero is requested. Default 206 // is 1x1. 207 // 208 // Return of a value other than NO_ERROR means an error has occurred: 209 // * BAD_VALUE - either w or h was zero 210 virtual status_t setDefaultBufferSize(uint32_t w, uint32_t h) = 0; 211 212 // setDefaultMaxBufferCount sets the default value for the maximum buffer 213 // count (the initial default is 2). If the producer has requested a 214 // buffer count using setBufferCount, the default buffer count will only 215 // take effect if the producer sets the count back to zero. 216 // 217 // The count must be between 2 and NUM_BUFFER_SLOTS, inclusive. 218 // 219 // Return of a value other than NO_ERROR means an error has occurred: 220 // * BAD_VALUE - bufferCount was out of range (see above). 221 virtual status_t setDefaultMaxBufferCount(int bufferCount) = 0; 222 223 // disableAsyncBuffer disables the extra buffer used in async mode 224 // (when both producer and consumer have set their "isControlledByApp" 225 // flag) and has dequeueBuffer() return WOULD_BLOCK instead. 226 // 227 // This can only be called before consumerConnect(). 228 // 229 // Return of a value other than NO_ERROR means an error has occurred: 230 // * INVALID_OPERATION - attempting to call this after consumerConnect. 231 virtual status_t disableAsyncBuffer() = 0; 232 233 // setMaxAcquiredBufferCount sets the maximum number of buffers that can 234 // be acquired by the consumer at one time (default 1). This call will 235 // fail if a producer is connected to the BufferQueue. 236 // 237 // maxAcquiredBuffers must be (inclusive) between 1 and MAX_MAX_ACQUIRED_BUFFERS. 238 // 239 // Return of a value other than NO_ERROR means an error has occurred: 240 // * BAD_VALUE - maxAcquiredBuffers was out of range (see above). 241 // * INVALID_OPERATION - attempting to call this after a producer connected. 242 virtual status_t setMaxAcquiredBufferCount(int maxAcquiredBuffers) = 0; 243 244 // setConsumerName sets the name used in logging 245 virtual void setConsumerName(const String8& name) = 0; 246 247 // setDefaultBufferFormat allows the BufferQueue to create 248 // GraphicBuffers of a defaultFormat if no format is specified 249 // in dequeueBuffer. Formats are enumerated in graphics.h; the 250 // initial default is HAL_PIXEL_FORMAT_RGBA_8888. 251 // 252 // Return of a value other than NO_ERROR means an unknown error has occurred. 253 virtual status_t setDefaultBufferFormat(uint32_t defaultFormat) = 0; 254 255 // setConsumerUsageBits will turn on additional usage bits for dequeueBuffer. 256 // These are merged with the bits passed to dequeueBuffer. The values are 257 // enumerated in gralloc.h, e.g. GRALLOC_USAGE_HW_RENDER; the default is 0. 258 // 259 // Return of a value other than NO_ERROR means an unknown error has occurred. 260 virtual status_t setConsumerUsageBits(uint32_t usage) = 0; 261 262 // setTransformHint bakes in rotation to buffers so overlays can be used. 263 // The values are enumerated in window.h, e.g. 264 // NATIVE_WINDOW_TRANSFORM_ROT_90. The default is 0 (no transform). 265 // 266 // Return of a value other than NO_ERROR means an unknown error has occurred. 267 virtual status_t setTransformHint(uint32_t hint) = 0; 268 269 // dump state into a string 270 virtual void dump(String8& result, const char* prefix) const = 0; 271 272public: 273 DECLARE_META_INTERFACE(GraphicBufferConsumer); 274}; 275 276// ---------------------------------------------------------------------------- 277 278class BnGraphicBufferConsumer : public BnInterface<IGraphicBufferConsumer> 279{ 280public: 281 virtual status_t onTransact( uint32_t code, 282 const Parcel& data, 283 Parcel* reply, 284 uint32_t flags = 0); 285}; 286 287// ---------------------------------------------------------------------------- 288}; // namespace android 289 290#endif // ANDROID_GUI_IGRAPHICBUFFERCONSUMER_H 291