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// Copyright (c) 2013 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/chromeos/login/user_image_loader.h"
#include "base/bind.h"
#include "base/file_util.h"
#include "base/files/file_path.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/threading/worker_pool.h"
#include "chrome/browser/chromeos/login/helper.h"
#include "chrome/browser/chromeos/login/user_image.h"
#include "content/public/browser/browser_thread.h"
#include "skia/ext/image_operations.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/gfx/codec/png_codec.h"
#include "ui/gfx/skbitmap_operations.h"
using content::BrowserThread;
namespace chromeos {
UserImageLoader::ImageInfo::ImageInfo(int size,
const LoadedCallback& loaded_cb)
: size(size),
loaded_cb(loaded_cb) {
}
UserImageLoader::ImageInfo::~ImageInfo() {
}
UserImageLoader::UserImageLoader(ImageDecoder::ImageCodec image_codec)
: target_message_loop_(NULL),
image_codec_(image_codec) {
}
UserImageLoader::~UserImageLoader() {
}
void UserImageLoader::Start(const std::string& filepath,
int size,
const LoadedCallback& loaded_cb) {
base::SequencedWorkerPool* pool = BrowserThread::GetBlockingPool();
SequenceToken sequence_token = pool->GetSequenceToken();
Start(filepath, size, sequence_token, loaded_cb);
}
void UserImageLoader::Start(const std::string& filepath,
int size,
const SequenceToken& token,
const LoadedCallback& loaded_cb) {
target_message_loop_ = base::MessageLoop::current();
ImageInfo image_info(size, loaded_cb);
base::SequencedWorkerPool* pool = BrowserThread::GetBlockingPool();
scoped_refptr<base::SequencedTaskRunner> task_runner = pool->
GetSequencedTaskRunnerWithShutdownBehavior(token,
base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN);
task_runner->PostTask(
FROM_HERE,
base::Bind(&UserImageLoader::LoadImage, this, filepath, image_info,
task_runner));
}
void UserImageLoader::LoadImage(
const std::string& filepath,
const ImageInfo& image_info,
scoped_refptr<base::SequencedTaskRunner> task_runner) {
DCHECK(task_runner->RunsTasksOnCurrentThread());
std::string image_data;
file_util::ReadFileToString(base::FilePath(filepath), &image_data);
scoped_refptr<ImageDecoder> image_decoder =
new ImageDecoder(this, image_data, image_codec_);
{
base::AutoLock lock(lock_);
image_info_map_.insert(std::make_pair(image_decoder.get(), image_info));
}
image_decoder->Start(task_runner);
}
void UserImageLoader::OnImageDecoded(const ImageDecoder* decoder,
const SkBitmap& decoded_image) {
ImageInfoMap::iterator info_it;
scoped_ptr<ImageInfo> image_info;
{
base::AutoLock lock(lock_);
info_it = image_info_map_.find(decoder);
if (info_it == image_info_map_.end()) {
NOTREACHED();
return;
}
image_info.reset(
new ImageInfo(info_it->second.size, info_it->second.loaded_cb));
image_info_map_.erase(info_it);
}
SkBitmap final_image = decoded_image;
if (image_info->size > 0) {
// Auto crop the image, taking the largest square in the center.
int size = std::min(decoded_image.width(), decoded_image.height());
int x = (decoded_image.width() - size) / 2;
int y = (decoded_image.height() - size) / 2;
SkBitmap cropped_image =
SkBitmapOperations::CreateTiledBitmap(decoded_image, x, y, size, size);
if (size > image_info->size) {
// Also downsize the image to save space and memory.
final_image =
skia::ImageOperations::Resize(cropped_image,
skia::ImageOperations::RESIZE_LANCZOS3,
image_info->size,
image_info->size);
} else {
final_image = cropped_image;
}
}
// Make the SkBitmap immutable as we won't modify it. This is important
// because otherwise it gets duplicated during painting, wasting memory.
final_image.setImmutable();
gfx::ImageSkia final_image_skia =
gfx::ImageSkia::CreateFrom1xBitmap(final_image);
final_image_skia.MakeThreadSafe();
UserImage user_image(final_image_skia, decoder->get_image_data());
if (image_codec_ == ImageDecoder::ROBUST_JPEG_CODEC)
user_image.MarkAsSafe();
target_message_loop_->PostTask(
FROM_HERE,
base::Bind(image_info->loaded_cb, user_image));
}
void UserImageLoader::OnDecodeImageFailed(const ImageDecoder* decoder) {
ImageInfoMap::iterator info_it;
scoped_ptr<ImageInfo> image_info;
{
base::AutoLock lock(lock_);
info_it = image_info_map_.find(decoder);
if (info_it == image_info_map_.end()) {
NOTREACHED();
return;
}
image_info.reset(
new ImageInfo(info_it->second.size, info_it->second.loaded_cb));
image_info_map_.erase(decoder);
}
target_message_loop_->PostTask(
FROM_HERE,
base::Bind(image_info->loaded_cb, UserImage()));
}
} // namespace chromeos
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