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// Copyright 2019 The Chromium 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 "third_party/blink/renderer/modules/video_rvfc/video_frame_request_callback_collection.h"
#include "third_party/blink/renderer/core/inspector/inspector_trace_events.h"
#include "third_party/blink/renderer/core/probe/core_probes.h"
namespace blink {
VideoFrameRequestCallbackCollection::VideoFrameRequestCallbackCollection(
ExecutionContext* context)
: context_(context) {}
VideoFrameRequestCallbackCollection::CallbackId
VideoFrameRequestCallbackCollection::RegisterFrameCallback(
VideoFrameCallback* callback) {
VideoFrameRequestCallbackCollection::CallbackId id = ++next_callback_id_;
callback->SetIsCancelled(false);
callback->SetId(id);
frame_callbacks_.push_back(callback);
return id;
}
void VideoFrameRequestCallbackCollection::CancelFrameCallback(CallbackId id) {
for (wtf_size_t i = 0; i < frame_callbacks_.size(); ++i) {
if (frame_callbacks_[i]->Id() == id) {
frame_callbacks_.EraseAt(i);
return;
}
}
for (const auto& callback : callbacks_to_invoke_) {
if (callback->Id() == id) {
callback->SetIsCancelled(true);
// will be removed at the end of ExecuteCallbacks().
return;
}
}
}
void VideoFrameRequestCallbackCollection::ExecuteFrameCallbacks(
double high_res_now_ms,
const VideoFrameMetadata* metadata) {
// First, generate a list of callbacks to consider. Callbacks registered from
// this point on are considered only for the "next" frame, not this one.
DCHECK(callbacks_to_invoke_.IsEmpty());
std::swap(callbacks_to_invoke_, frame_callbacks_);
for (const auto& callback : callbacks_to_invoke_) {
// When the ExecutionContext is destroyed (e.g. an iframe is detached),
// there is no path to perform wrapper tracing for the callbacks. In such a
// case, the callback functions may already have been collected by V8 GC.
// Since it's possible that a callback function being invoked detaches an
// iframe, we need to check the condition for each callback.
if (context_->IsContextDestroyed())
break;
// Another requestAnimationFrame callback already cancelled this one.
if (callback->IsCancelled())
continue;
callback->Invoke(high_res_now_ms, metadata);
}
callbacks_to_invoke_.clear();
}
void VideoFrameRequestCallbackCollection::Trace(Visitor* visitor) {
visitor->Trace(frame_callbacks_);
visitor->Trace(callbacks_to_invoke_);
visitor->Trace(context_);
}
VideoFrameRequestCallbackCollection::V8VideoFrameCallback::V8VideoFrameCallback(
V8VideoFrameRequestCallback* callback)
: callback_(callback) {}
void VideoFrameRequestCallbackCollection::V8VideoFrameCallback::Trace(
blink::Visitor* visitor) {
visitor->Trace(callback_);
VideoFrameRequestCallbackCollection::VideoFrameCallback::Trace(visitor);
}
void VideoFrameRequestCallbackCollection::V8VideoFrameCallback::Invoke(
double highResTime,
const VideoFrameMetadata* metadata) {
callback_->InvokeAndReportException(nullptr, highResTime, metadata);
}
} // namespace blink
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