chrome/browser/image_decoder.cc

   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 }
  24
  25 ImageDecoder::~ImageDecoder() {}
  26
  27 void ImageDecoder::Start(scoped_refptr<base::SequencedTaskRunner> task_runner) {
  28   task_runner_ = task_runner;
  29   BrowserThread::PostTask(
  30      BrowserThread::IO, FROM_HERE,
  31      base::Bind(&ImageDecoder::DecodeImageInSandbox, this, image_data_));
  32 }
  33
  34 bool ImageDecoder::OnMessageReceived(const IPC::Message& message) {
  35   bool handled = true;
  36   IPC_BEGIN_MESSAGE_MAP(ImageDecoder, message)
  37     IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_DecodeImage_Succeeded,
  38                         OnDecodeImageSucceeded)
  39     IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_DecodeImage_Failed,
  40                         OnDecodeImageFailed)
  41     IPC_MESSAGE_UNHANDLED(handled = false)
  42   IPC_END_MESSAGE_MAP()
  43   return handled;
  44 }
  45
  46 void ImageDecoder::OnDecodeImageSucceeded(const SkBitmap& decoded_image) {
  47   DCHECK(task_runner_->RunsTasksOnCurrentThread());
  48   if (delegate_)
  49     delegate_->OnImageDecoded(this, decoded_image);
  50 }
  51
  52 void ImageDecoder::OnDecodeImageFailed() {
  53   DCHECK(task_runner_->RunsTasksOnCurrentThread());
  54   if (delegate_)
  55     delegate_->OnDecodeImageFailed(this);
  56 }
  57
  58 void ImageDecoder::DecodeImageInSandbox(
  59     const std::vector<unsigned char>& image_data) {
  60   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  61   UtilityProcessHost* utility_process_host;
  62   utility_process_host = UtilityProcessHost::Create(this, task_runner_.get());
  63   utility_process_host->EnableZygote();
  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(new ChromeUtilityMsg_DecodeImage(image_data));
  69   }
  70 }