80 lines
3.1 KiB
Text
80 lines
3.1 KiB
Text
/*
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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 below 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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