chromium/cc/paint/skottie_serialization_history.h

// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_PAINT_SKOTTIE_SERIALIZATION_HISTORY_H_
#define CC_PAINT_SKOTTIE_SERIALIZATION_HISTORY_H_

#include "base/containers/flat_map.h"
#include "base/synchronization/lock.h"
#include "base/thread_annotations.h"
#include "cc/paint/paint_export.h"
#include "cc/paint/paint_flags.h"
#include "cc/paint/paint_image.h"
#include "cc/paint/skottie_frame_data.h"
#include "cc/paint/skottie_resource_metadata.h"
#include "cc/paint/skottie_text_property_value.h"

namespace cc {

class SkottieWrapper;

// For each frame of a Skottie animation that uses out-of-process rasterization:
// 1) The animation's state is captured in a DrawSkottieOp object.
// 2) The object is serialized, transmitted over IPC, then deserialized.
// 3) The animation's state is updated in the target raster process.
// 4) The new frame is rendered/rasterized.
//
// SkottieSerializationHistory keeps track of past animation state that has
// been serialized and transmitted for rasterization. This allows the pipeline
// to be optimized such that only "new"/"updated" animation state is transmitted
// for each frame rather than re-transmitting everything. In other words, step
// 2) can use this history to filter out existing animation state that is
// already reflected in the target process from a previous frame in step 3).
//
// This class is thread-safe.
class CC_PAINT_EXPORT SkottieSerializationHistory { … };

}  // namespace cc

#endif  // CC_PAINT_SKOTTIE_SERIALIZATION_HISTORY_H_