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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_OFFLINE_PAGES_VISUALS_DECODER_IMPL_H_
#define CHROME_BROWSER_OFFLINE_PAGES_VISUALS_DECODER_IMPL_H_
#include <memory>
#include "components/offline_pages/core/visuals_decoder.h"
namespace image_fetcher {
class ImageDecoder;
} // namespace image_fetcher
namespace offline_pages {
class VisualsDecoderImpl : public VisualsDecoder {
public:
explicit VisualsDecoderImpl(
std::unique_ptr<image_fetcher::ImageDecoder> decoder);
~VisualsDecoderImpl() override;
// Decodes the downloaded image, crops it and re-encodes it as a PNG
// file to be used as the thumbnail of an offlined suggested article or as the
// favicon. In the case of .ICO favicons, the frame whose size matches our
// preferred favicon size (or the next larger one) will be re-encoded.
// Note: the local decoding in a separate process and local re-encoding as a
// PNG are important security measures to disarm a potential
// maliciously-crafted JPEG, which cannot maintain its evil nature after being
// converted to PNG.
void DecodeAndCropImage(const std::string& thumbnail_data,
DecodeComplete complete_callback) override;
private:
std::unique_ptr<image_fetcher::ImageDecoder> image_decoder_;
};
} // namespace offline_pages
#endif // CHROME_BROWSER_OFFLINE_PAGES_VISUALS_DECODER_IMPL_H_
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