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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_IMAGE_DECODER_H_
#define CHROME_BROWSER_IMAGE_DECODER_H_
#include <string>
#include <vector>
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/threading/sequenced_worker_pool.h"
#include "content/public/browser/utility_process_host_client.h"
class SkBitmap;
// Decodes an image in a sandboxed process.
class ImageDecoder : public content::UtilityProcessHostClient {
public:
class Delegate {
public:
// Called when image is decoded.
// |decoder| is used to identify the image in case of decoding several
// images simultaneously.
virtual void OnImageDecoded(const ImageDecoder* decoder,
const SkBitmap& decoded_image) = 0;
// Called when decoding image failed. Delegate can do some cleanup in
// this handler.
virtual void OnDecodeImageFailed(const ImageDecoder* decoder) {}
protected:
virtual ~Delegate() {}
};
enum ImageCodec {
DEFAULT_CODEC = 0, // Uses WebKit image decoding (via WebImage).
ROBUST_JPEG_CODEC, // Restrict decoding to robust jpeg codec.
};
ImageDecoder(Delegate* delegate,
const std::string& image_data,
ImageCodec image_codec);
// Starts asynchronous image decoding. Once finished, the callback will be
// posted back to |task_runner|.
void Start(scoped_refptr<base::SequencedTaskRunner> task_runner);
const std::vector<unsigned char>& get_image_data() const {
return image_data_;
}
void set_delegate(Delegate* delegate) { delegate_ = delegate; }
void set_shrink_to_fit(bool shrink_to_fit) { shrink_to_fit_ = shrink_to_fit; }
private:
// It's a reference counted object, so destructor is private.
~ImageDecoder() override;
// Overidden from UtilityProcessHostClient:
bool OnMessageReceived(const IPC::Message& message) override;
// IPC message handlers.
void OnDecodeImageSucceeded(const SkBitmap& decoded_image);
void OnDecodeImageFailed();
// Launches sandboxed process that will decode the image.
void DecodeImageInSandbox(const std::vector<unsigned char>& image_data);
Delegate* delegate_;
std::vector<unsigned char> image_data_;
const ImageCodec image_codec_;
scoped_refptr<base::SequencedTaskRunner> task_runner_;
bool shrink_to_fit_; // if needed for IPC msg size limit
DISALLOW_COPY_AND_ASSIGN(ImageDecoder);
};
#endif // CHROME_BROWSER_IMAGE_DECODER_H_
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