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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/thumbnail/generator/image_thumbnail_request.h"
#include <memory>
#include <utility>
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/task/thread_pool.h"
#include "base/threading/scoped_blocking_call.h"
#include "build/build_config.h"
#include "chrome/browser/thumbnail/generator/thumbnail_util.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "skia/ext/image_operations.h"
namespace {
// Ignore image files that are too large to avoid long delays.
const int64_t kMaxImageSize = 10 * 1024 * 1024; // 10 MB
std::vector<uint8_t> LoadImageData(const base::FilePath& path) {
base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
base::BlockingType::WILL_BLOCK);
std::vector<uint8_t> data;
// Confirm that the file's size is within our threshold.
base::File file(path, base::File::FLAG_OPEN | base::File::FLAG_READ);
if (!file.IsValid())
return data;
int64_t file_size = file.GetLength();
if (file_size <= 0 || file_size > kMaxImageSize) {
LOG(ERROR) << "Unexpected file size: " << path.MaybeAsASCII() << ", "
<< file_size;
return data;
}
data.resize(file_size);
if (!file.ReadAndCheck(0, data)) {
LOG(ERROR) << "Failed to read file: " << path.MaybeAsASCII();
data.clear();
}
return data;
}
} // namespace
ImageThumbnailRequest::ImageThumbnailRequest(
int icon_size,
base::OnceCallback<void(const SkBitmap&)> callback)
: icon_size_(icon_size), callback_(std::move(callback)) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
}
ImageThumbnailRequest::~ImageThumbnailRequest() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
}
void ImageThumbnailRequest::Start(const base::FilePath& path) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_BLOCKING},
base::BindOnce(&LoadImageData, path),
base::BindOnce(&ImageThumbnailRequest::OnLoadComplete,
weak_ptr_factory_.GetWeakPtr()));
}
void ImageThumbnailRequest::OnImageDecoded(const SkBitmap& decoded_image) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
ScaleDownBitmap(icon_size_, decoded_image,
base::BindOnce(&ImageThumbnailRequest::FinishRequest,
weak_ptr_factory_.GetWeakPtr()));
}
void ImageThumbnailRequest::OnDecodeImageFailed() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
LOG(ERROR) << "Failed to decode image.";
FinishRequest(SkBitmap());
}
void ImageThumbnailRequest::OnLoadComplete(std::vector<uint8_t> data) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
if (data.empty()) {
FinishRequest(SkBitmap());
return;
}
ImageDecoder::Start(this, std::move(data));
}
void ImageThumbnailRequest::FinishRequest(SkBitmap thumbnail) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
content::GetUIThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(std::move(callback_), std::move(thumbnail)));
delete this;
}
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