| // 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; } |
| |
| private: |
| // It's a reference counted object, so destructor is private. |
| virtual ~ImageDecoder(); |
| |
| // Overidden from UtilityProcessHostClient: |
| virtual 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_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ImageDecoder); |
| }; |
| |
| #endif // CHROME_BROWSER_IMAGE_DECODER_H_ |