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67 lines
2.3 KiB
67 lines
2.3 KiB
7 months ago
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/*
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* Copyright (C) 2017 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.frameworks.displayservice@1.0;
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import IEventCallback;
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interface IDisplayEventReceiver {
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/**
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* Attach callback to start receiving events. Hotplug events are enabled
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* by default. Vsync events must be enabled with setVsyncRate.
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*
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* @return status Must be:
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* SUCCESS if callback is initialized correctly.
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* BAD_VALUE if callback is nullptr or if this has already been called.
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* UNKNOWN if callback cannot be initialized.
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*/
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init(IEventCallback callback) generates (Status status);
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/**
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* Must start (or stop) sending callbacks immediately as requested.
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*
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* @param count Request to be sent a callback for every <count>th event.
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* If zero, then only send callbacks when requestNextVsync is
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* called. By default, this will be zero. Must be >= 0.
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* @return status Must be:
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* SUCCESS if rate is set successfully.
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* BAD_VALUE if count < 0 or no init.
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* UNKNOWN for all other errors.
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*/
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setVsyncRate(int32_t count) generates (Status status);
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/**
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* Must have no effect if vsync rate (set with setVsyncRate) is 0.
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*
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* @return status Must be:
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* SUCCESS if request successfully processed.
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* BAD_VALUE if no init.
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* UNKNOWN for all other errors.
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*/
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requestNextVsync() generates (Status status);
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/**
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* Server must drop all references to callback and stop sending events.
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* Client must call this method if init was called.
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*
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* @return status Must be:
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* SUCCESS if request successfully processed.
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* BAD_VALUE if init has not been called.
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* UNKNOWN for all other errors.
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*/
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close() generates (Status status);
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};
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