f9ecb4e67e
This reverts commit 79884be809.
Reason for revert: broke flutter build -- initializer_list?
Original change's description:
> migrating SkTDArray towards std::vector api
>
> push -> push_back
> add some aliases to match std::vector: count, reserve, ...
>
> Bug: skia:
> Change-Id: I1921c31d0d6e5ed3d622a0def6054c697be2d02f
> Reviewed-on: https://skia-review.googlesource.com/145884
> Reviewed-by: Mike Klein <mtklein@google.com>
> Reviewed-by: Florin Malita <fmalita@chromium.org>
> Commit-Queue: Mike Reed <reed@google.com>
TBR=mtklein@google.com,fmalita@chromium.org,reed@google.com
Change-Id: Ib6132b725aaed7c01287e3e8c2b5a14da3d3d7e9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/146140
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
121 lines
3.9 KiB
C++
121 lines
3.9 KiB
C++
/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkMessageBus_DEFINED
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#define SkMessageBus_DEFINED
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#include "../private/SkNoncopyable.h"
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#include "SkMutex.h"
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#include "SkOnce.h"
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#include "SkTArray.h"
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#include "SkTDArray.h"
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#include "SkTypes.h"
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/**
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* Message must implement bool Message::shouldSend(uint32_t inboxID) const. Perhaps someday we
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* can use std::experimental::is_detected to avoid this requirement by sending to all inboxes when
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* the method is not detected on Message.
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*/
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template <typename Message>
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class SkMessageBus : SkNoncopyable {
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public:
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// Post a message to be received by Inboxes for this Message type. Checks
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// Message::shouldSend() for each inbox. Threadsafe.
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static void Post(const Message& m);
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class Inbox {
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public:
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Inbox(uint32_t uniqueID = SK_InvalidUniqueID);
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~Inbox();
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// Overwrite out with all the messages we've received since the last call. Threadsafe.
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void poll(SkTArray<Message>* out);
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private:
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SkTArray<Message> fMessages;
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SkMutex fMessagesMutex;
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uint32_t fUniqueID;
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friend class SkMessageBus;
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void receive(const Message& m); // SkMessageBus is a friend only to call this.
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};
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private:
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SkMessageBus();
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static SkMessageBus* Get();
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SkTDArray<Inbox*> fInboxes;
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SkMutex fInboxesMutex;
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};
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// This must go in a single .cpp file, not some .h, or we risk creating more than one global
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// SkMessageBus per type when using shared libraries. NOTE: at most one per file will compile.
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#define DECLARE_SKMESSAGEBUS_MESSAGE(Message) \
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template <> \
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SkMessageBus<Message>* SkMessageBus<Message>::Get() { \
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static SkOnce once; \
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static SkMessageBus<Message>* bus; \
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once([] { bus = new SkMessageBus<Message>(); }); \
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return bus; \
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}
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// ----------------------- Implementation of SkMessageBus::Inbox -----------------------
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template<typename Message>
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SkMessageBus<Message>::Inbox::Inbox(uint32_t uniqueID) : fUniqueID(uniqueID) {
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// Register ourselves with the corresponding message bus.
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SkMessageBus<Message>* bus = SkMessageBus<Message>::Get();
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SkAutoMutexAcquire lock(bus->fInboxesMutex);
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bus->fInboxes.push(this);
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}
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template<typename Message>
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SkMessageBus<Message>::Inbox::~Inbox() {
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// Remove ourselves from the corresponding message bus.
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SkMessageBus<Message>* bus = SkMessageBus<Message>::Get();
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SkAutoMutexAcquire lock(bus->fInboxesMutex);
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// This is a cheaper fInboxes.remove(fInboxes.find(this)) when order doesn't matter.
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for (int i = 0; i < bus->fInboxes.count(); i++) {
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if (this == bus->fInboxes[i]) {
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bus->fInboxes.removeShuffle(i);
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break;
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}
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}
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}
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template<typename Message>
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void SkMessageBus<Message>::Inbox::receive(const Message& m) {
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SkAutoMutexAcquire lock(fMessagesMutex);
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fMessages.push_back(m);
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}
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template<typename Message>
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void SkMessageBus<Message>::Inbox::poll(SkTArray<Message>* messages) {
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SkASSERT(messages);
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messages->reset();
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SkAutoMutexAcquire lock(fMessagesMutex);
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fMessages.swap(*messages);
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}
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// ----------------------- Implementation of SkMessageBus -----------------------
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template <typename Message>
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SkMessageBus<Message>::SkMessageBus() {}
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template <typename Message>
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/*static*/ void SkMessageBus<Message>::Post(const Message& m) {
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SkMessageBus<Message>* bus = SkMessageBus<Message>::Get();
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SkAutoMutexAcquire lock(bus->fInboxesMutex);
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for (int i = 0; i < bus->fInboxes.count(); i++) {
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if (m.shouldSend(bus->fInboxes[i]->fUniqueID)) {
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bus->fInboxes[i]->receive(m);
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}
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}
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}
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#endif // SkMessageBus_DEFINED
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