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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "chrome/browser/thumbnail/cc/jpeg_thumbnail_helper.h"
#include <algorithm>
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/strings/string_number_conversions.h"
#include "base/task/bind_post_task.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/thread_pool.h"
#include "skia/ext/image_operations.h"
#include "ui/gfx/codec/jpeg_codec.h"
namespace thumbnail {
namespace {
SkBitmap ResizeBitmap(const SkBitmap& bitmap) {
constexpr int kScale = 2;
int width = bitmap.width() / kScale;
int height = bitmap.height() / kScale;
SkIRect dest_subset = {0, 0, width, height};
SkBitmap output = skia::ImageOperations::Resize(
bitmap, skia::ImageOperations::RESIZE_BETTER, width, height, dest_subset);
output.setImmutable();
return output;
}
void CompressTask(
const SkBitmap& bitmap,
base::OnceCallback<void(std::vector<uint8_t>)> post_processing_task) {
constexpr int kCompressionQuality = 97;
std::optional<std::vector<uint8_t>> data =
gfx::JPEGCodec::Encode(ResizeBitmap(bitmap), kCompressionQuality);
std::move(post_processing_task).Run(std::move(data.value()));
}
void WriteTask(base::FilePath file_path,
std::vector<uint8_t> compressed_data,
base::OnceCallback<void(bool)> post_write_task) {
DCHECK(!compressed_data.empty());
if (!base::WriteFile(file_path, compressed_data)) {
base::DeleteFile(file_path);
std::move(post_write_task).Run(false);
return;
}
std::move(post_write_task).Run(true);
}
void ReadTask(base::FilePath file_path,
base::OnceCallback<void(std::optional<std::vector<uint8_t>>)>
post_read_task) {
std::optional<std::vector<uint8_t>> read_data =
base::ReadFileToBytes(file_path);
if (!read_data.has_value()) {
base::DeleteFile(file_path);
}
std::move(post_read_task).Run(std::move(read_data));
}
void DeleteTask(base::FilePath file_path) {
if (base::PathExists(file_path)) {
base::DeleteFile(file_path);
}
}
} // anonymous namespace
JpegThumbnailHelper::JpegThumbnailHelper(
const base::FilePath& base_path,
scoped_refptr<base::SequencedTaskRunner> file_task_runner)
: base_path_(base_path),
default_task_runner_(base::SequencedTaskRunner::GetCurrentDefault()),
file_task_runner_(file_task_runner) {}
JpegThumbnailHelper::~JpegThumbnailHelper() {
DCHECK(default_task_runner_->RunsTasksInCurrentSequence());
}
void JpegThumbnailHelper::Compress(
const SkBitmap& bitmap,
base::OnceCallback<void(std::vector<uint8_t>)> post_processing_task) {
DCHECK(default_task_runner_->RunsTasksInCurrentSequence());
base::ThreadPool::PostTask(
FROM_HERE,
{base::TaskPriority::BEST_EFFORT,
base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
base::BindOnce(&CompressTask, bitmap,
base::BindPostTask(default_task_runner_,
std::move(post_processing_task))));
}
void JpegThumbnailHelper::Write(
TabId tab_id,
std::vector<uint8_t> compressed_data,
base::OnceCallback<void(bool)> post_write_task) {
DCHECK(default_task_runner_->RunsTasksInCurrentSequence());
base::FilePath file_path = GetJpegFilePath(tab_id);
file_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&WriteTask, file_path, compressed_data,
base::BindPostTask(default_task_runner_,
std::move(post_write_task))));
}
void JpegThumbnailHelper::Read(
TabId tab_id,
base::OnceCallback<void(std::optional<std::vector<uint8_t>>)>
post_read_task) {
DCHECK(default_task_runner_->RunsTasksInCurrentSequence());
base::FilePath file_path = GetJpegFilePath(tab_id);
file_task_runner_->PostTask(
FROM_HERE, base::BindOnce(&ReadTask, file_path,
base::BindPostTask(default_task_runner_,
std::move(post_read_task))));
}
void JpegThumbnailHelper::Delete(TabId tab_id) {
DCHECK(default_task_runner_->RunsTasksInCurrentSequence());
base::FilePath file_path = GetJpegFilePath(tab_id);
file_task_runner_->PostTask(FROM_HERE,
base::BindOnce(&DeleteTask, file_path));
}
base::FilePath JpegThumbnailHelper::GetJpegFilePath(TabId tab_id) {
base::FilePath file_path = base_path_.Append(base::NumberToString(tab_id));
return file_path.AddExtension(".jpeg");
}
} // namespace thumbnail
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