2 * Copyright (C) 2013 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #ifndef ANDROID_GUI_IGRAPHICBUFFERCONSUMER_H
18 #define ANDROID_GUI_IGRAPHICBUFFERCONSUMER_H
21 #include <sys/types.h>
23 #include <utils/Errors.h>
24 #include <utils/RefBase.h>
25 #include <utils/Timers.h>
27 #include <binder/IInterface.h>
31 // ----------------------------------------------------------------------------
33 class IConsumerListener;
37 class IGraphicBufferConsumer : public IInterface {
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);
51 enum { INVALID_BUFFER_SLOT = -1 };
54 // mGraphicBuffer points to the buffer allocated for this slot, or is NULL
55 // if the buffer in this slot has been acquired in the past (see
56 // BufferSlot.mAcquireCalled).
57 sp<GraphicBuffer> mGraphicBuffer;
59 // mFence is a fence that will signal when the buffer is idle.
62 // mCrop is the current crop rectangle for this buffer slot.
65 // mTransform is the current transform flags for this buffer slot.
68 // mScalingMode is the current scaling mode for this buffer slot.
69 uint32_t mScalingMode;
71 // mTimestamp is the current timestamp for this buffer slot. This gets
72 // to set by queueBuffer each time this slot is queued.
75 // mFrameNumber is the number of the queued frame for this slot.
76 uint64_t mFrameNumber;
78 // mBuf is the slot index of this buffer
81 // mIsDroppable whether this buffer was queued with the
82 // property that it can be replaced by a new buffer for the purpose of
83 // making sure dequeueBuffer() won't block.
84 // i.e.: was the BufferQueue in "mDequeueBufferCannotBlock" when this buffer
88 // Indicates whether this buffer has been seen by a consumer yet
93 // acquireBuffer attempts to acquire ownership of the next pending buffer in
94 // the BufferQueue. If no buffer is pending then it returns -EINVAL. If a
95 // buffer is successfully acquired, the information about the buffer is
96 // returned in BufferItem. If the buffer returned had previously been
97 // acquired then the BufferItem::mGraphicBuffer field of buffer is set to
98 // NULL and it is assumed that the consumer still holds a reference to the
101 // If presentWhen is nonzero, it indicates the time when the buffer will
102 // be displayed on screen. If the buffer's timestamp is farther in the
103 // future, the buffer won't be acquired, and PRESENT_LATER will be
104 // returned. The presentation time is in nanoseconds, and the time base
105 // is CLOCK_MONOTONIC.
106 virtual status_t acquireBuffer(BufferItem *buffer, nsecs_t presentWhen) = 0;
108 // releaseBuffer releases a buffer slot from the consumer back to the
109 // BufferQueue. This may be done while the buffer's contents are still
110 // being accessed. The fence will signal when the buffer is no longer
111 // in use. frameNumber is used to indentify the exact buffer returned.
113 // If releaseBuffer returns STALE_BUFFER_SLOT, then the consumer must free
114 // any references to the just-released buffer that it might have, as if it
115 // had received a onBuffersReleased() call with a mask set for the released
118 // Note that the dependencies on EGL will be removed once we switch to using
119 // the Android HW Sync HAL.
120 virtual status_t releaseBuffer(int buf, uint64_t frameNumber,
121 EGLDisplay display, EGLSyncKHR fence,
122 const sp<Fence>& releaseFence) = 0;
124 // consumerConnect connects a consumer to the BufferQueue. Only one
125 // consumer may be connected, and when that consumer disconnects the
126 // BufferQueue is placed into the "abandoned" state, causing most
127 // interactions with the BufferQueue by the producer to fail.
128 // controlledByApp indicates whether the consumer is controlled by
131 // consumer may not be NULL.
132 virtual status_t consumerConnect(const sp<IConsumerListener>& consumer, bool controlledByApp) = 0;
134 // consumerDisconnect disconnects a consumer from the BufferQueue. All
135 // buffers will be freed and the BufferQueue is placed in the "abandoned"
136 // state, causing most interactions with the BufferQueue by the producer to
138 virtual status_t consumerDisconnect() = 0;
140 // getReleasedBuffers sets the value pointed to by slotMask to a bit mask
141 // indicating which buffer slots have been released by the BufferQueue
142 // but have not yet been released by the consumer.
144 // This should be called from the onBuffersReleased() callback.
145 virtual status_t getReleasedBuffers(uint32_t* slotMask) = 0;
147 // setDefaultBufferSize is used to set the size of buffers returned by
148 // dequeueBuffer when a width and height of zero is requested. Default
150 virtual status_t setDefaultBufferSize(uint32_t w, uint32_t h) = 0;
152 // setDefaultMaxBufferCount sets the default value for the maximum buffer
153 // count (the initial default is 2). If the producer has requested a
154 // buffer count using setBufferCount, the default buffer count will only
155 // take effect if the producer sets the count back to zero.
157 // The count must be between 2 and NUM_BUFFER_SLOTS, inclusive.
158 virtual status_t setDefaultMaxBufferCount(int bufferCount) = 0;
160 // disableAsyncBuffer disables the extra buffer used in async mode
161 // (when both producer and consumer have set their "isControlledByApp"
162 // flag) and has dequeueBuffer() return WOULD_BLOCK instead.
164 // This can only be called before consumerConnect().
165 virtual status_t disableAsyncBuffer() = 0;
167 // setMaxAcquiredBufferCount sets the maximum number of buffers that can
168 // be acquired by the consumer at one time (default 1). This call will
169 // fail if a producer is connected to the BufferQueue.
170 virtual status_t setMaxAcquiredBufferCount(int maxAcquiredBuffers) = 0;
172 // setConsumerName sets the name used in logging
173 virtual void setConsumerName(const String8& name) = 0;
175 // setDefaultBufferFormat allows the BufferQueue to create
176 // GraphicBuffers of a defaultFormat if no format is specified
177 // in dequeueBuffer. Formats are enumerated in graphics.h; the
178 // initial default is HAL_PIXEL_FORMAT_RGBA_8888.
179 virtual status_t setDefaultBufferFormat(uint32_t defaultFormat) = 0;
181 // setConsumerUsageBits will turn on additional usage bits for dequeueBuffer.
182 // These are merged with the bits passed to dequeueBuffer. The values are
183 // enumerated in gralloc.h, e.g. GRALLOC_USAGE_HW_RENDER; the default is 0.
184 virtual status_t setConsumerUsageBits(uint32_t usage) = 0;
186 // setTransformHint bakes in rotation to buffers so overlays can be used.
187 // The values are enumerated in window.h, e.g.
188 // NATIVE_WINDOW_TRANSFORM_ROT_90. The default is 0 (no transform).
189 virtual status_t setTransformHint(uint32_t hint) = 0;
191 // dump state into a string
192 virtual void dump(String8& result, const char* prefix) const = 0;
195 DECLARE_META_INTERFACE(GraphicBufferConsumer);
198 // ----------------------------------------------------------------------------
200 class BnGraphicBufferConsumer : public BnInterface<IGraphicBufferConsumer>
203 virtual status_t onTransact( uint32_t code,
209 // ----------------------------------------------------------------------------
210 }; // namespace android
212 #endif // ANDROID_GUI_IGRAPHICBUFFERCONSUMER_H