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80 lines
3.1 KiB
80 lines
3.1 KiB
/* |
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* Copyright (C) 2016 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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package android.hardware.automotive.evs@1.0; |
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import types; |
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/** |
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* Represents a single camera and is the primary interface for capturing images. |
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*/ |
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interface IEvsDisplay { |
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/** |
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* Returns basic information about the EVS display provided by the system. |
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* |
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* See the description of the DisplayDesc structure for details. |
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*/ |
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getDisplayInfo() generates (DisplayDesc info); |
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/** |
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* Clients may set the display state to express their desired state. |
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* |
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* The HAL implementation must gracefully accept a request for any state while in |
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* any other state, although the response may be to defer or ignore the request. The display |
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* is defined to start in the NOT_VISIBLE state upon initialization. The client is |
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* then expected to request the VISIBLE_ON_NEXT_FRAME state, and then begin providing |
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* video. When the display is no longer required, the client is expected to request |
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* the NOT_VISIBLE state after passing the last video frame. |
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* Returns INVALID_ARG if the requested state is not a recognized value. |
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*/ |
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setDisplayState(DisplayState state) generates (EvsResult result); |
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/** |
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* This call requests the current state of the display |
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* |
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* The HAL implementation should report the actual current state, which might |
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* transiently differ from the most recently requested state. Note, however, that |
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* the logic responsible for changing display states should generally live above |
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* the device layer, making it undesirable for the HAL implementation to spontaneously |
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* change display states. |
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*/ |
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getDisplayState() generates (DisplayState state); |
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/** |
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* This call returns a handle to a frame buffer associated with the display. |
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* |
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* The returned buffer may be locked and written to by software and/or GL. This buffer |
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* must be returned via a call to returnTargetBufferForDisplay() even if the |
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* display is no longer visible. |
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*/ |
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getTargetBuffer() generates (BufferDesc buffer); |
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/** |
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* This call tells the display that the buffer is ready for display. |
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* |
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* The buffer is no longer valid for use by the client after this call. |
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* There is no maximum time the caller may hold onto the buffer before making this |
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* call. The buffer may be returned at any time and in any DisplayState, but all |
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* buffers are expected to be returned before the IEvsDisplay interface is destroyed. |
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*/ |
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returnTargetBufferForDisplay(BufferDesc buffer) generates (EvsResult result); |
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};
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