| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "flutter/shell/platform/embedder/vsync_waiter_embedder.h" |
| |
| namespace flutter { |
| |
| VsyncWaiterEmbedder::VsyncWaiterEmbedder( |
| const VsyncCallback& vsync_callback, |
| const flutter::TaskRunners& task_runners) |
| : VsyncWaiter(task_runners), vsync_callback_(vsync_callback) { |
| FML_DCHECK(vsync_callback_); |
| } |
| |
| VsyncWaiterEmbedder::~VsyncWaiterEmbedder() = default; |
| |
| // |VsyncWaiter| |
| void VsyncWaiterEmbedder::AwaitVSync() { |
| auto* weak_waiter = new std::weak_ptr<VsyncWaiter>(shared_from_this()); |
| intptr_t baton = reinterpret_cast<intptr_t>(weak_waiter); |
| vsync_callback_(baton); |
| } |
| |
| // static |
| bool VsyncWaiterEmbedder::OnEmbedderVsync( |
| const flutter::TaskRunners& task_runners, |
| intptr_t baton, |
| fml::TimePoint frame_start_time, |
| fml::TimePoint frame_target_time) { |
| if (baton == 0) { |
| return false; |
| } |
| |
| // If the time here is in the future, the contract for `FlutterEngineOnVsync` |
| // says that the engine will only process the frame when the time becomes |
| // current. |
| task_runners.GetUITaskRunner()->PostTaskForTime( |
| [frame_start_time, frame_target_time, baton]() { |
| std::weak_ptr<VsyncWaiter>* weak_waiter = |
| reinterpret_cast<std::weak_ptr<VsyncWaiter>*>(baton); |
| auto vsync_waiter = weak_waiter->lock(); |
| delete weak_waiter; |
| if (vsync_waiter) { |
| vsync_waiter->FireCallback(frame_start_time, frame_target_time); |
| } |
| }, |
| frame_start_time); |
| |
| return true; |
| } |
| |
| } // namespace flutter |