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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.
#include "chrome/browser/image_decoder.h"
#include "base/bind.h"
#include "chrome/browser/browser_process.h"
#include "chrome/common/chrome_utility_messages.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/utility_process_host.h"
using content::BrowserThread;
using content::UtilityProcessHost;
namespace {
// static, Leaky to allow access from any thread.
base::LazyInstance<ImageDecoder>::Leaky g_decoder = LAZY_INSTANCE_INITIALIZER;
// How long to wait after the last request has been received before ending
// batch mode.
const int kBatchModeTimeoutSeconds = 5;
} // namespace
ImageDecoder::ImageDecoder()
: image_request_id_counter_(0), last_request_(base::TimeTicks::Now()) {
// A single ImageDecoder instance should live for the life of the program.
// Explicitly add a reference so the object isn't deleted.
AddRef();
}
ImageDecoder::~ImageDecoder() {
}
ImageDecoder::ImageRequest::ImageRequest(
const scoped_refptr<base::SequencedTaskRunner>& task_runner)
: task_runner_(task_runner) {
}
ImageDecoder::ImageRequest::~ImageRequest() {
ImageDecoder::Cancel(this);
}
// static
void ImageDecoder::Start(ImageRequest* image_request,
const std::string& image_data) {
StartWithOptions(image_request, image_data, DEFAULT_CODEC, false);
}
// static
void ImageDecoder::StartWithOptions(ImageRequest* image_request,
const std::string& image_data,
ImageCodec image_codec,
bool shrink_to_fit) {
DCHECK(image_request);
DCHECK(image_request->task_runner());
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
base::Bind(
&ImageDecoder::DecodeImageInSandbox,
g_decoder.Pointer(), image_request,
std::vector<unsigned char>(image_data.begin(), image_data.end()),
image_codec, shrink_to_fit));
}
// static
void ImageDecoder::Cancel(ImageRequest* image_request) {
DCHECK(image_request);
g_decoder.Pointer()->CancelImpl(image_request);
}
void ImageDecoder::DecodeImageInSandbox(
ImageRequest* image_request,
const std::vector<unsigned char>& image_data,
ImageCodec image_codec,
bool shrink_to_fit) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if (!utility_process_host_) {
StartBatchMode();
}
if (!utility_process_host_) {
// Utility process failed to start; notify delegate and return.
// Without this check, we were seeing crashes on startup. Further
// investigation is needed to determine why the utility process
// is failing to start. See crbug.com/472272
image_request->task_runner()->PostTask(
FROM_HERE, base::Bind(&ImageRequest::OnDecodeImageFailed,
base::Unretained(image_request)));
return;
}
last_request_ = base::TimeTicks::Now();
base::AutoLock lock(map_lock_);
image_request_id_map_.insert(
std::make_pair(image_request_id_counter_, image_request));
switch (image_codec) {
case ROBUST_JPEG_CODEC:
utility_process_host_->Send(new ChromeUtilityMsg_RobustJPEGDecodeImage(
image_data, image_request_id_counter_));
break;
case DEFAULT_CODEC:
utility_process_host_->Send(new ChromeUtilityMsg_DecodeImage(
image_data, shrink_to_fit, image_request_id_counter_));
break;
}
++image_request_id_counter_;
}
void ImageDecoder::CancelImpl(ImageRequest* image_request) {
base::AutoLock lock(map_lock_);
for (auto it = image_request_id_map_.begin();
it != image_request_id_map_.end();) {
if (it->second == image_request) {
image_request_id_map_.erase(it++);
} else {
++it;
}
}
}
void ImageDecoder::StartBatchMode() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
utility_process_host_ =
UtilityProcessHost::Create(this, base::MessageLoopProxy::current().get())
->AsWeakPtr();
if (!utility_process_host_->StartBatchMode()) {
utility_process_host_.reset();
return;
}
batch_mode_timer_.Start(
FROM_HERE, base::TimeDelta::FromSeconds(kBatchModeTimeoutSeconds),
this, &ImageDecoder::StopBatchMode);
}
void ImageDecoder::StopBatchMode() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if ((base::TimeTicks::Now() - last_request_)
< base::TimeDelta::FromSeconds(kBatchModeTimeoutSeconds)) {
return;
}
if (utility_process_host_) {
utility_process_host_->EndBatchMode();
utility_process_host_.reset();
}
batch_mode_timer_.Stop();
}
bool ImageDecoder::OnMessageReceived(
const IPC::Message& message) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(ImageDecoder, message)
IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_DecodeImage_Succeeded,
OnDecodeImageSucceeded)
IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_DecodeImage_Failed,
OnDecodeImageFailed)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
void ImageDecoder::OnDecodeImageSucceeded(
const SkBitmap& decoded_image,
int request_id) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
base::AutoLock lock(map_lock_);
auto it = image_request_id_map_.find(request_id);
if (it != image_request_id_map_.end()) {
ImageRequest* image_request = it->second;
image_request->task_runner()->PostTask(
FROM_HERE, base::Bind(&ImageRequest::OnImageDecoded,
base::Unretained(image_request), decoded_image));
image_request_id_map_.erase(it);
}
}
void ImageDecoder::OnDecodeImageFailed(int request_id) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
base::AutoLock lock(map_lock_);
auto it = image_request_id_map_.find(request_id);
if (it != image_request_id_map_.end()) {
ImageRequest* image_request = it->second;
image_request->task_runner()->PostTask(
FROM_HERE, base::Bind(&ImageRequest::OnDecodeImageFailed,
base::Unretained(image_request)));
image_request_id_map_.erase(it);
}
}
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