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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/image_decoder.h"
      6 
      7 #include "base/bind.h"
      8 #include "chrome/browser/browser_process.h"
      9 #include "chrome/common/chrome_utility_messages.h"
     10 #include "content/public/browser/browser_thread.h"
     11 #include "content/public/browser/utility_process_host.h"
     12 
     13 using content::BrowserThread;
     14 using content::UtilityProcessHost;
     15 
     16 ImageDecoder::ImageDecoder(Delegate* delegate,
     17                            const std::string& image_data,
     18                            ImageCodec image_codec)
     19     : delegate_(delegate),
     20       image_data_(image_data.begin(), image_data.end()),
     21       image_codec_(image_codec),
     22       task_runner_(NULL),
     23       shrink_to_fit_(false) {
     24 }
     25 
     26 ImageDecoder::~ImageDecoder() {}
     27 
     28 void ImageDecoder::Start(scoped_refptr<base::SequencedTaskRunner> task_runner) {
     29   task_runner_ = task_runner;
     30   BrowserThread::PostTask(
     31      BrowserThread::IO, FROM_HERE,
     32      base::Bind(&ImageDecoder::DecodeImageInSandbox, this, image_data_));
     33 }
     34 
     35 bool ImageDecoder::OnMessageReceived(const IPC::Message& message) {
     36   bool handled = true;
     37   IPC_BEGIN_MESSAGE_MAP(ImageDecoder, message)
     38     IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_DecodeImage_Succeeded,
     39                         OnDecodeImageSucceeded)
     40     IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_DecodeImage_Failed,
     41                         OnDecodeImageFailed)
     42     IPC_MESSAGE_UNHANDLED(handled = false)
     43   IPC_END_MESSAGE_MAP()
     44   return handled;
     45 }
     46 
     47 void ImageDecoder::OnDecodeImageSucceeded(const SkBitmap& decoded_image) {
     48   DCHECK(task_runner_->RunsTasksOnCurrentThread());
     49   if (delegate_)
     50     delegate_->OnImageDecoded(this, decoded_image);
     51 }
     52 
     53 void ImageDecoder::OnDecodeImageFailed() {
     54   DCHECK(task_runner_->RunsTasksOnCurrentThread());
     55   if (delegate_)
     56     delegate_->OnDecodeImageFailed(this);
     57 }
     58 
     59 void ImageDecoder::DecodeImageInSandbox(
     60     const std::vector<unsigned char>& image_data) {
     61   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
     62   UtilityProcessHost* utility_process_host;
     63   utility_process_host = UtilityProcessHost::Create(this, task_runner_.get());
     64   if (image_codec_ == ROBUST_JPEG_CODEC) {
     65     utility_process_host->Send(
     66         new ChromeUtilityMsg_RobustJPEGDecodeImage(image_data));
     67   } else {
     68     utility_process_host->Send(
     69         new ChromeUtilityMsg_DecodeImage(image_data, shrink_to_fit_));
     70   }
     71 }
     72