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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.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_OFFSCREEN_CANVAS_PLACEHOLDER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_OFFSCREEN_CANVAS_PLACEHOLDER_H_
#include <memory>
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/single_thread_task_runner.h"
#include "components/viz/common/resources/resource_id.h"
#include "third_party/blink/renderer/platform/platform_export.h"
namespace blink {
class OffscreenCanvasFrameDispatcher;
class StaticBitmapImage;
class PLATFORM_EXPORT OffscreenCanvasPlaceholder {
public:
~OffscreenCanvasPlaceholder();
virtual void SetPlaceholderFrame(
scoped_refptr<StaticBitmapImage>,
base::WeakPtr<OffscreenCanvasFrameDispatcher>,
scoped_refptr<base::SingleThreadTaskRunner>,
viz::ResourceId resource_id);
void ReleasePlaceholderFrame();
void SetSuspendOffscreenCanvasAnimation(bool);
static OffscreenCanvasPlaceholder* GetPlaceholderById(
unsigned placeholder_id);
void RegisterPlaceholder(unsigned placeholder_id);
void UnregisterPlaceholder();
const scoped_refptr<StaticBitmapImage>& PlaceholderFrame() const {
return placeholder_frame_;
}
bool IsPlaceholderRegistered() const {
return placeholder_id_ != kNoPlaceholderId;
}
private:
bool PostSetSuspendAnimationToOffscreenCanvasThread(bool suspend);
scoped_refptr<StaticBitmapImage> placeholder_frame_;
base::WeakPtr<OffscreenCanvasFrameDispatcher> frame_dispatcher_;
scoped_refptr<base::SingleThreadTaskRunner> frame_dispatcher_task_runner_;
viz::ResourceId placeholder_frame_resource_id_ = 0;
enum {
kNoPlaceholderId = -1,
};
int placeholder_id_ = kNoPlaceholderId;
enum AnimationState {
kActiveAnimation,
kSuspendedAnimation,
kShouldSuspendAnimation,
kShouldActivateAnimation,
};
AnimationState animation_state_ = kActiveAnimation;
};
} // blink
#endif
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