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// Copyright 2016 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/platform/graphics/offscreen_canvas_placeholder.h"
#include "base/single_thread_task_runner.h"
#include "third_party/blink/renderer/platform/cross_thread_functional.h"
#include "third_party/blink/renderer/platform/graphics/offscreen_canvas_frame_dispatcher.h"
#include "third_party/blink/renderer/platform/graphics/static_bitmap_image.h"
#include "third_party/blink/renderer/platform/web_task_runner.h"
#include "third_party/blink/renderer/platform/wtf/hash_map.h"
namespace {
typedef HashMap<int, blink::OffscreenCanvasPlaceholder*> PlaceholderIdMap;
PlaceholderIdMap& placeholderRegistry() {
DCHECK(IsMainThread());
DEFINE_STATIC_LOCAL(PlaceholderIdMap, s_placeholderRegistry, ());
return s_placeholderRegistry;
}
void releaseFrameToDispatcher(
base::WeakPtr<blink::OffscreenCanvasFrameDispatcher> dispatcher,
scoped_refptr<blink::Image> oldImage,
viz::ResourceId resourceId) {
oldImage = nullptr; // Needed to unref'ed on the right thread
if (dispatcher) {
dispatcher->ReclaimResource(resourceId);
}
}
void SetSuspendAnimation(
base::WeakPtr<blink::OffscreenCanvasFrameDispatcher> dispatcher,
bool suspend) {
if (dispatcher) {
dispatcher->SetSuspendAnimation(suspend);
}
}
} // unnamed namespace
namespace blink {
OffscreenCanvasPlaceholder::~OffscreenCanvasPlaceholder() {
UnregisterPlaceholder();
}
OffscreenCanvasPlaceholder* OffscreenCanvasPlaceholder::GetPlaceholderById(
unsigned placeholder_id) {
PlaceholderIdMap::iterator it = placeholderRegistry().find(placeholder_id);
if (it == placeholderRegistry().end())
return nullptr;
return it->value;
}
void OffscreenCanvasPlaceholder::RegisterPlaceholder(unsigned placeholder_id) {
DCHECK(!placeholderRegistry().Contains(placeholder_id));
DCHECK(!IsPlaceholderRegistered());
placeholderRegistry().insert(placeholder_id, this);
placeholder_id_ = placeholder_id;
}
void OffscreenCanvasPlaceholder::UnregisterPlaceholder() {
if (!IsPlaceholderRegistered())
return;
DCHECK(placeholderRegistry().find(placeholder_id_)->value == this);
placeholderRegistry().erase(placeholder_id_);
placeholder_id_ = kNoPlaceholderId;
}
void OffscreenCanvasPlaceholder::SetPlaceholderFrame(
scoped_refptr<StaticBitmapImage> new_frame,
base::WeakPtr<OffscreenCanvasFrameDispatcher> dispatcher,
scoped_refptr<base::SingleThreadTaskRunner> task_runner,
viz::ResourceId resource_id) {
DCHECK(IsPlaceholderRegistered());
DCHECK(new_frame);
ReleasePlaceholderFrame();
placeholder_frame_ = std::move(new_frame);
frame_dispatcher_ = std::move(dispatcher);
frame_dispatcher_task_runner_ = std::move(task_runner);
placeholder_frame_resource_id_ = resource_id;
if (animation_state_ == kShouldSuspendAnimation) {
bool success = PostSetSuspendAnimationToOffscreenCanvasThread(true);
DCHECK(success);
animation_state_ = kSuspendedAnimation;
} else if (animation_state_ == kShouldActivateAnimation) {
bool success = PostSetSuspendAnimationToOffscreenCanvasThread(false);
DCHECK(success);
animation_state_ = kActiveAnimation;
}
}
void OffscreenCanvasPlaceholder::ReleasePlaceholderFrame() {
DCHECK(IsPlaceholderRegistered());
if (placeholder_frame_) {
placeholder_frame_->Transfer();
PostCrossThreadTask(
*frame_dispatcher_task_runner_, FROM_HERE,
CrossThreadBind(releaseFrameToDispatcher, std::move(frame_dispatcher_),
std::move(placeholder_frame_),
placeholder_frame_resource_id_));
}
}
void OffscreenCanvasPlaceholder::SetSuspendOffscreenCanvasAnimation(
bool suspend) {
switch (animation_state_) {
case kActiveAnimation:
if (suspend) {
if (PostSetSuspendAnimationToOffscreenCanvasThread(suspend)) {
animation_state_ = kSuspendedAnimation;
} else {
animation_state_ = kShouldSuspendAnimation;
}
}
break;
case kSuspendedAnimation:
if (!suspend) {
if (PostSetSuspendAnimationToOffscreenCanvasThread(suspend)) {
animation_state_ = kActiveAnimation;
} else {
animation_state_ = kShouldActivateAnimation;
}
}
break;
case kShouldSuspendAnimation:
if (!suspend) {
animation_state_ = kActiveAnimation;
}
break;
case kShouldActivateAnimation:
if (suspend) {
animation_state_ = kSuspendedAnimation;
}
break;
default:
NOTREACHED();
}
}
bool OffscreenCanvasPlaceholder::PostSetSuspendAnimationToOffscreenCanvasThread(
bool suspend) {
if (!frame_dispatcher_task_runner_)
return false;
PostCrossThreadTask(
*frame_dispatcher_task_runner_, FROM_HERE,
CrossThreadBind(SetSuspendAnimation, frame_dispatcher_, suspend));
return true;
}
} // blink
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