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// 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 CHROMEOS_ASH_COMPONENTS_PHONEHUB_ICON_DECODER_H_
#define CHROMEOS_ASH_COMPONENTS_PHONEHUB_ICON_DECODER_H_
#include "base/functional/callback.h"
#include "base/memory/raw_ref.h"
#include "chromeos/ash/components/phonehub/notification.h"
#include "ui/gfx/image/image.h"
namespace ash::phonehub {
// Decodes icons in batches.
// TODO(b/233279034): There are three decoders now: `CameraRollThumbnailDecoder`
// `IconDecoder`, and `NotificationProcessor`. It may makes sense
// to abstract out the redundant logic in a single place.
class IconDecoder {
public:
// Each decoding operation is associated with a unique id that later is used
// to identify the result in the batch output.
struct DecodingData {
DecodingData(unsigned long id, const std::string& input_data);
const unsigned long id;
const raw_ref<const std::string> input_data;
gfx::Image result;
};
IconDecoder(const IconDecoder&) = delete;
IconDecoder& operator=(const IconDecoder&) = delete;
virtual ~IconDecoder() = default;
// Decodes the `input_data` in each item in `decide_items` and places the
// result inside the `result` field in the `decode_items`. At the end,
// `finished_callback` is called and the list of `DecodingData` items is
// returned back to the callee.
// Important note: If this method is called "BEFORE" the result of the
// previous call is ready, the previous call is cancelled without
// calling `finished_callback`.
virtual void BatchDecode(
std::unique_ptr<std::vector<DecodingData>> decode_items,
base::OnceCallback<void(std::unique_ptr<std::vector<DecodingData>>)>
finished_callback) = 0;
protected:
IconDecoder() = default;
};
} // namespace ash::phonehub
#endif // CHROMEOS_ASH_COMPONENTS_PHONEHUB_ICON_DECODER_H_
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