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// Copyright 2016 The Chromium Authors
// 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 <optional>
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/task/single_thread_task_runner.h"
#include "cc/paint/paint_flags.h"
#include "components/viz/common/resources/resource_id.h"
#include "third_party/blink/renderer/platform/graphics/canvas_resource_dispatcher.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace blink {
class CanvasResource;
class PLATFORM_EXPORT OffscreenCanvasPlaceholder {
DISALLOW_NEW();
public:
~OffscreenCanvasPlaceholder();
virtual void SetOffscreenCanvasResource(scoped_refptr<CanvasResource>&&,
viz::ResourceId resource_id);
void SetOffscreenCanvasDispatcher(
base::WeakPtr<CanvasResourceDispatcher>,
scoped_refptr<base::SingleThreadTaskRunner>);
void SetSuspendOffscreenCanvasAnimation(
CanvasResourceDispatcher::AnimationState requested_state);
static OffscreenCanvasPlaceholder* GetPlaceholderCanvasById(
unsigned placeholder_id);
void RegisterPlaceholderCanvas(unsigned placeholder_id);
void UnregisterPlaceholderCanvas();
bool HasOffscreenCanvasFrame() const { return !!placeholder_frame_; }
CanvasResource* OffscreenCanvasFrame() const {
return placeholder_frame_.get();
}
bool IsOffscreenCanvasRegistered() const {
return placeholder_id_ != kNoPlaceholderId;
}
virtual bool HasCanvasCapture() const { return false; }
CanvasResourceDispatcher::AnimationState GetAnimationStateForTesting() const {
return current_animation_state_;
}
private:
bool PostSetAnimationStateToOffscreenCanvasThread(
CanvasResourceDispatcher::AnimationState animation_state);
// Information about the Offscreen Canvas:
scoped_refptr<CanvasResource> placeholder_frame_;
base::WeakPtr<CanvasResourceDispatcher> frame_dispatcher_;
scoped_refptr<base::SingleThreadTaskRunner> frame_dispatcher_task_runner_;
enum {
kNoPlaceholderId = -1,
};
int placeholder_id_ = kNoPlaceholderId;
// If an animation state change was requested, but we couldn't update it
// immediately, then this holds the most recent request.
std::optional<CanvasResourceDispatcher::AnimationState>
deferred_animation_state_;
// Most recent animation state sent to the dispatcher.
CanvasResourceDispatcher::AnimationState current_animation_state_ =
CanvasResourceDispatcher::AnimationState::kActive;
std::optional<cc::PaintFlags::FilterQuality> filter_quality_ = std::nullopt;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_OFFSCREEN_CANVAS_PLACEHOLDER_H_
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