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authorwolfbeast <mcwerewolf@gmail.com>2018-05-12 11:09:44 +0200
committerwolfbeast <mcwerewolf@gmail.com>2018-05-12 11:09:44 +0200
commitcfe5ef4ac7cd59f094b538252161ad74223c47da (patch)
treee5c0ee7e70db84bd2bfc6062784006769e9df730 /widget/gonk/libui/InputTransport.h
parent28cf922aa9af4d4b8e0a3ce91dc1270a55986909 (diff)
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Remove Gonk build directories
Diffstat (limited to 'widget/gonk/libui/InputTransport.h')
-rw-r--r--widget/gonk/libui/InputTransport.h443
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diff --git a/widget/gonk/libui/InputTransport.h b/widget/gonk/libui/InputTransport.h
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-/*
- * Copyright (C) 2010 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef _ANDROIDFW_INPUT_TRANSPORT_H
-#define _ANDROIDFW_INPUT_TRANSPORT_H
-
-/**
- * Native input transport.
- *
- * The InputChannel provides a mechanism for exchanging InputMessage structures across processes.
- *
- * The InputPublisher and InputConsumer each handle one end-point of an input channel.
- * The InputPublisher is used by the input dispatcher to send events to the application.
- * The InputConsumer is used by the application to receive events from the input dispatcher.
- */
-
-#include "Input.h"
-#include <utils/Errors.h>
-#include <utils/Timers.h>
-#include <utils/RefBase.h>
-#include <utils/String8.h>
-#include <utils/Vector.h>
-#include <utils/BitSet.h>
-
-namespace android {
-
-/*
- * Intermediate representation used to send input events and related signals.
- */
-struct InputMessage {
- enum {
- TYPE_KEY = 1,
- TYPE_MOTION = 2,
- TYPE_FINISHED = 3,
- };
-
- struct Header {
- uint32_t type;
- uint32_t padding; // 8 byte alignment for the body that follows
- } header;
-
- union Body {
- struct Key {
- uint32_t seq;
- nsecs_t eventTime;
- int32_t deviceId;
- int32_t source;
- int32_t action;
- int32_t flags;
- int32_t keyCode;
- int32_t scanCode;
- int32_t metaState;
- int32_t repeatCount;
- nsecs_t downTime;
-
- inline size_t size() const {
- return sizeof(Key);
- }
- } key;
-
- struct Motion {
- uint32_t seq;
- nsecs_t eventTime;
- int32_t deviceId;
- int32_t source;
- int32_t action;
- int32_t flags;
- int32_t metaState;
- int32_t buttonState;
- int32_t edgeFlags;
- nsecs_t downTime;
- float xOffset;
- float yOffset;
- float xPrecision;
- float yPrecision;
- size_t pointerCount;
- struct Pointer {
- PointerProperties properties;
- PointerCoords coords;
- } pointers[MAX_POINTERS];
-
- int32_t getActionId() const {
- uint32_t index = (action & AMOTION_EVENT_ACTION_POINTER_INDEX_MASK)
- >> AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT;
- return pointers[index].properties.id;
- }
-
- inline size_t size() const {
- return sizeof(Motion) - sizeof(Pointer) * MAX_POINTERS
- + sizeof(Pointer) * pointerCount;
- }
- } motion;
-
- struct Finished {
- uint32_t seq;
- bool handled;
-
- inline size_t size() const {
- return sizeof(Finished);
- }
- } finished;
- } body;
-
- bool isValid(size_t actualSize) const;
- size_t size() const;
-};
-
-/*
- * An input channel consists of a local unix domain socket used to send and receive
- * input messages across processes. Each channel has a descriptive name for debugging purposes.
- *
- * Each endpoint has its own InputChannel object that specifies its file descriptor.
- *
- * The input channel is closed when all references to it are released.
- */
-class InputChannel : public RefBase {
-protected:
- virtual ~InputChannel();
-
-public:
- InputChannel(const String8& name, int fd);
-
- /* Creates a pair of input channels.
- *
- * Returns OK on success.
- */
- static status_t openInputChannelPair(const String8& name,
- sp<InputChannel>& outServerChannel, sp<InputChannel>& outClientChannel);
-
- inline String8 getName() const { return mName; }
- inline int getFd() const { return mFd; }
-
- /* Sends a message to the other endpoint.
- *
- * If the channel is full then the message is guaranteed not to have been sent at all.
- * Try again after the consumer has sent a finished signal indicating that it has
- * consumed some of the pending messages from the channel.
- *
- * Returns OK on success.
- * Returns WOULD_BLOCK if the channel is full.
- * Returns DEAD_OBJECT if the channel's peer has been closed.
- * Other errors probably indicate that the channel is broken.
- */
- status_t sendMessage(const InputMessage* msg);
-
- /* Receives a message sent by the other endpoint.
- *
- * If there is no message present, try again after poll() indicates that the fd
- * is readable.
- *
- * Returns OK on success.
- * Returns WOULD_BLOCK if there is no message present.
- * Returns DEAD_OBJECT if the channel's peer has been closed.
- * Other errors probably indicate that the channel is broken.
- */
- status_t receiveMessage(InputMessage* msg);
-
- /* Returns a new object that has a duplicate of this channel's fd. */
- sp<InputChannel> dup() const;
-
-private:
- String8 mName;
- int mFd;
-};
-
-/*
- * Publishes input events to an input channel.
- */
-class InputPublisher {
-public:
- /* Creates a publisher associated with an input channel. */
- explicit InputPublisher(const sp<InputChannel>& channel);
-
- /* Destroys the publisher and releases its input channel. */
- ~InputPublisher();
-
- /* Gets the underlying input channel. */
- inline sp<InputChannel> getChannel() { return mChannel; }
-
- /* Publishes a key event to the input channel.
- *
- * Returns OK on success.
- * Returns WOULD_BLOCK if the channel is full.
- * Returns DEAD_OBJECT if the channel's peer has been closed.
- * Returns BAD_VALUE if seq is 0.
- * Other errors probably indicate that the channel is broken.
- */
- status_t publishKeyEvent(
- uint32_t seq,
- int32_t deviceId,
- int32_t source,
- int32_t action,
- int32_t flags,
- int32_t keyCode,
- int32_t scanCode,
- int32_t metaState,
- int32_t repeatCount,
- nsecs_t downTime,
- nsecs_t eventTime);
-
- /* Publishes a motion event to the input channel.
- *
- * Returns OK on success.
- * Returns WOULD_BLOCK if the channel is full.
- * Returns DEAD_OBJECT if the channel's peer has been closed.
- * Returns BAD_VALUE if seq is 0 or if pointerCount is less than 1 or greater than MAX_POINTERS.
- * Other errors probably indicate that the channel is broken.
- */
- status_t publishMotionEvent(
- uint32_t seq,
- int32_t deviceId,
- int32_t source,
- int32_t action,
- int32_t flags,
- int32_t edgeFlags,
- int32_t metaState,
- int32_t buttonState,
- float xOffset,
- float yOffset,
- float xPrecision,
- float yPrecision,
- nsecs_t downTime,
- nsecs_t eventTime,
- size_t pointerCount,
- const PointerProperties* pointerProperties,
- const PointerCoords* pointerCoords);
-
- /* Receives the finished signal from the consumer in reply to the original dispatch signal.
- * If a signal was received, returns the message sequence number,
- * and whether the consumer handled the message.
- *
- * The returned sequence number is never 0 unless the operation failed.
- *
- * Returns OK on success.
- * Returns WOULD_BLOCK if there is no signal present.
- * Returns DEAD_OBJECT if the channel's peer has been closed.
- * Other errors probably indicate that the channel is broken.
- */
- status_t receiveFinishedSignal(uint32_t* outSeq, bool* outHandled);
-
-private:
- sp<InputChannel> mChannel;
-};
-
-/*
- * Consumes input events from an input channel.
- */
-class InputConsumer {
-public:
- /* Creates a consumer associated with an input channel. */
- explicit InputConsumer(const sp<InputChannel>& channel);
-
- /* Destroys the consumer and releases its input channel. */
- ~InputConsumer();
-
- /* Gets the underlying input channel. */
- inline sp<InputChannel> getChannel() { return mChannel; }
-
- /* Consumes an input event from the input channel and copies its contents into
- * an InputEvent object created using the specified factory.
- *
- * Tries to combine a series of move events into larger batches whenever possible.
- *
- * If consumeBatches is false, then defers consuming pending batched events if it
- * is possible for additional samples to be added to them later. Call hasPendingBatch()
- * to determine whether a pending batch is available to be consumed.
- *
- * If consumeBatches is true, then events are still batched but they are consumed
- * immediately as soon as the input channel is exhausted.
- *
- * The frameTime parameter specifies the time when the current display frame started
- * rendering in the CLOCK_MONOTONIC time base, or -1 if unknown.
- *
- * The returned sequence number is never 0 unless the operation failed.
- *
- * Returns OK on success.
- * Returns WOULD_BLOCK if there is no event present.
- * Returns DEAD_OBJECT if the channel's peer has been closed.
- * Returns NO_MEMORY if the event could not be created.
- * Other errors probably indicate that the channel is broken.
- */
- status_t consume(InputEventFactoryInterface* factory, bool consumeBatches,
- nsecs_t frameTime, uint32_t* outSeq, InputEvent** outEvent);
-
- /* Sends a finished signal to the publisher to inform it that the message
- * with the specified sequence number has finished being process and whether
- * the message was handled by the consumer.
- *
- * Returns OK on success.
- * Returns BAD_VALUE if seq is 0.
- * Other errors probably indicate that the channel is broken.
- */
- status_t sendFinishedSignal(uint32_t seq, bool handled);
-
- /* Returns true if there is a deferred event waiting.
- *
- * Should be called after calling consume() to determine whether the consumer
- * has a deferred event to be processed. Deferred events are somewhat special in
- * that they have already been removed from the input channel. If the input channel
- * becomes empty, the client may need to do extra work to ensure that it processes
- * the deferred event despite the fact that the input channel's file descriptor
- * is not readable.
- *
- * One option is simply to call consume() in a loop until it returns WOULD_BLOCK.
- * This guarantees that all deferred events will be processed.
- *
- * Alternately, the caller can call hasDeferredEvent() to determine whether there is
- * a deferred event waiting and then ensure that its event loop wakes up at least
- * one more time to consume the deferred event.
- */
- bool hasDeferredEvent() const;
-
- /* Returns true if there is a pending batch.
- *
- * Should be called after calling consume() with consumeBatches == false to determine
- * whether consume() should be called again later on with consumeBatches == true.
- */
- bool hasPendingBatch() const;
-
-private:
- // True if touch resampling is enabled.
- const bool mResampleTouch;
-
- // The input channel.
- sp<InputChannel> mChannel;
-
- // The current input message.
- InputMessage mMsg;
-
- // True if mMsg contains a valid input message that was deferred from the previous
- // call to consume and that still needs to be handled.
- bool mMsgDeferred;
-
- // Batched motion events per device and source.
- struct Batch {
- Vector<InputMessage> samples;
- };
- Vector<Batch> mBatches;
-
- // Touch state per device and source, only for sources of class pointer.
- struct History {
- nsecs_t eventTime;
- BitSet32 idBits;
- int32_t idToIndex[MAX_POINTER_ID + 1];
- PointerCoords pointers[MAX_POINTERS];
-
- void initializeFrom(const InputMessage* msg) {
- eventTime = msg->body.motion.eventTime;
- idBits.clear();
- for (size_t i = 0; i < msg->body.motion.pointerCount; i++) {
- uint32_t id = msg->body.motion.pointers[i].properties.id;
- idBits.markBit(id);
- idToIndex[id] = i;
- pointers[i].copyFrom(msg->body.motion.pointers[i].coords);
- }
- }
-
- const PointerCoords& getPointerById(uint32_t id) const {
- return pointers[idToIndex[id]];
- }
- };
- struct TouchState {
- int32_t deviceId;
- int32_t source;
- size_t historyCurrent;
- size_t historySize;
- History history[2];
- History lastResample;
-
- void initialize(int32_t deviceId, int32_t source) {
- this->deviceId = deviceId;
- this->source = source;
- historyCurrent = 0;
- historySize = 0;
- lastResample.eventTime = 0;
- lastResample.idBits.clear();
- }
-
- void addHistory(const InputMessage* msg) {
- historyCurrent ^= 1;
- if (historySize < 2) {
- historySize += 1;
- }
- history[historyCurrent].initializeFrom(msg);
- }
-
- const History* getHistory(size_t index) const {
- return &history[(historyCurrent + index) & 1];
- }
- };
- Vector<TouchState> mTouchStates;
-
- // Chain of batched sequence numbers. When multiple input messages are combined into
- // a batch, we append a record here that associates the last sequence number in the
- // batch with the previous one. When the finished signal is sent, we traverse the
- // chain to individually finish all input messages that were part of the batch.
- struct SeqChain {
- uint32_t seq; // sequence number of batched input message
- uint32_t chain; // sequence number of previous batched input message
- };
- Vector<SeqChain> mSeqChains;
-
- status_t consumeBatch(InputEventFactoryInterface* factory,
- nsecs_t frameTime, uint32_t* outSeq, InputEvent** outEvent);
- status_t consumeSamples(InputEventFactoryInterface* factory,
- Batch& batch, size_t count, uint32_t* outSeq, InputEvent** outEvent);
-
- void updateTouchState(InputMessage* msg);
- void rewriteMessage(const TouchState& state, InputMessage* msg);
- void resampleTouchState(nsecs_t frameTime, MotionEvent* event,
- const InputMessage *next);
-
- ssize_t findBatch(int32_t deviceId, int32_t source) const;
- ssize_t findTouchState(int32_t deviceId, int32_t source) const;
-
- status_t sendUnchainedFinishedSignal(uint32_t seq, bool handled);
-
- static void initializeKeyEvent(KeyEvent* event, const InputMessage* msg);
- static void initializeMotionEvent(MotionEvent* event, const InputMessage* msg);
- static void addSample(MotionEvent* event, const InputMessage* msg);
- static bool canAddSample(const Batch& batch, const InputMessage* msg);
- static ssize_t findSampleNoLaterThan(const Batch& batch, nsecs_t time);
- static bool shouldResampleTool(int32_t toolType);
-
- static bool isTouchResamplingEnabled();
-};
-
-} // namespace android
-
-#endif // _ANDROIDFW_INPUT_TRANSPORT_H