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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_ASH_COMPONENTS_PHONEHUB_CAMERA_ROLL_THUMBNAIL_DECODER_H_
#define CHROMEOS_ASH_COMPONENTS_PHONEHUB_CAMERA_ROLL_THUMBNAIL_DECODER_H_
#include "base/functional/callback.h"
#include "chromeos/ash/components/phonehub/proto/phonehub_api.pb.h"
namespace ash::phonehub {
class CameraRollItem;
// Decodes camera roll item thumbnails received from
// |FetchCameraRollItemsResponse| in batches, and converts decoded items into
// |CameraRollItem| objects that can be displayed on the UI.
class CameraRollThumbnailDecoder {
public:
// Result of a |BatchDecode| operation.
enum class BatchDecodeResult {
// All items in the batch have been completed.
kCompleted = 0,
// The decode requests for this batch has been cancelled.
kCancelled = 1,
kMaxValue = kCancelled
};
CameraRollThumbnailDecoder(const CameraRollThumbnailDecoder&) = delete;
CameraRollThumbnailDecoder& operator=(const CameraRollThumbnailDecoder&) =
delete;
virtual ~CameraRollThumbnailDecoder() = default;
// Loads thumbnails of the batch of camera roll items either using encoded
// thumbnail bytes in the |FetchCameraRollItemsResponse|, or from existing
// images in |current_items| if an item has not changed.
//
// Returns decoded items through |callback| if the full batch can be decoded;
// otherwise an empty list will be returned with appropriate result code.
virtual void BatchDecode(
const proto::FetchCameraRollItemsResponse& response,
const std::vector<CameraRollItem>& current_items,
base::OnceCallback<void(BatchDecodeResult result,
const std::vector<CameraRollItem>&)>
callback) = 0;
protected:
CameraRollThumbnailDecoder() = default;
};
} // namespace ash::phonehub
#endif // CHROMEOS_ASH_COMPONENTS_PHONEHUB_CAMERA_ROLL_THUMBNAIL_DECODER_H_
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