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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.
#include "ash/ambient/ambient_backup_photo_downloader.h"
#include <utility>
#include <vector>
#include "ash/ambient/ambient_controller.h"
#include "ash/ambient/ambient_photo_cache.h"
#include "ash/public/cpp/ambient/proto/photo_cache_entry.pb.h"
#include "ash/public/cpp/image_util.h"
#include "ash/shell.h"
#include "base/check.h"
#include "base/files/file_util.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_operations.h"
#include "ui/gfx/image/image_util.h"
namespace ash {
namespace {
// TODO(b/304527743): Ask the server to resize the photo for us if the backend
// can make the appropriate config changes.
std::vector<unsigned char> ResizeAndEncode(const gfx::ImageSkia& image,
gfx::Size target_size) {
static constexpr int kJpegEncodingQuality = 95;
// Only shrink images, and keep the original aspect ratio.
gfx::Size original_size = image.size();
if (target_size.width() < original_size.width() &&
target_size.height() < original_size.height()) {
float width_scale =
static_cast<float>(target_size.width()) / original_size.width();
float height_scale =
static_cast<float>(target_size.height()) / original_size.height();
target_size = gfx::ScaleToRoundedSize(original_size,
std::max(width_scale, height_scale));
} else {
target_size = original_size;
}
gfx::ImageSkia resized_image = gfx::ImageSkiaOperations::CreateResizedImage(
image, skia::ImageOperations::RESIZE_BETTER, target_size);
CHECK(!resized_image.isNull());
std::optional<std::vector<uint8_t>> encoded_image =
gfx::JPEG1xEncodedDataFromImage(gfx::Image(resized_image),
kJpegEncodingQuality);
return encoded_image.value_or(std::vector<uint8_t>());
}
} // namespace
AmbientBackupPhotoDownloader::AmbientBackupPhotoDownloader(
AmbientAccessTokenController& access_token_controller,
int cache_idx,
gfx::Size target_size,
const std::string& url,
base::OnceCallback<void(bool success)> completion_cb)
: cache_idx_(cache_idx),
target_size_(target_size),
file_task_runner_(
base::ThreadPool::CreateSequencedTaskRunner({base::MayBlock()})),
completion_cb_(std::move(completion_cb)) {
// Since the photo is large, downloading to an in-memory string exceeds the
// response size limits imposed by `SimpleUrLoader`. Downloading to a
// temporary file is recommended instead.
ambient_photo_cache::DownloadPhotoToTempFile(
url, access_token_controller,
base::BindOnce(&AmbientBackupPhotoDownloader::DecodeImage,
weak_factory_.GetWeakPtr()));
}
AmbientBackupPhotoDownloader::~AmbientBackupPhotoDownloader() {
if (!temp_image_path_.empty()) {
// The same `file_task_runner_` that reads/decodes the file is used to
// delete the file. Prevents unpredictable behavior if the call to
// `image_util::DecodeImageFile()` below is pending when this class is
// destroyed.
file_task_runner_->PostTask(FROM_HERE,
base::GetDeleteFileCallback(temp_image_path_));
}
}
void AmbientBackupPhotoDownloader::RunCompletionCallback(bool success) {
CHECK(completion_cb_);
std::move(completion_cb_).Run(success);
}
void AmbientBackupPhotoDownloader::DecodeImage(base::FilePath temp_image_path) {
if (temp_image_path.empty()) {
RunCompletionCallback(false);
return;
}
temp_image_path_ = std::move(temp_image_path);
image_util::DecodeImageFile(
base::BindOnce(&AmbientBackupPhotoDownloader::ScheduleResizeAndEncode,
weak_factory_.GetWeakPtr()),
temp_image_path_, data_decoder::mojom::ImageCodec::kDefault,
file_task_runner_);
}
void AmbientBackupPhotoDownloader::ScheduleResizeAndEncode(
const gfx::ImageSkia& decoded_image) {
if (decoded_image.isNull()) {
RunCompletionCallback(false);
return;
}
// `ResizeAndEncode()` can be a computationally expensive operation, so run it
// on a blocking thread in the thread pool to prevent blocking the main
// thread.
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, {base::MayBlock()},
base::BindOnce(&ResizeAndEncode, decoded_image, target_size_),
base::BindOnce(&AmbientBackupPhotoDownloader::SaveImage,
weak_factory_.GetWeakPtr()));
}
void AmbientBackupPhotoDownloader::SaveImage(
const std::vector<unsigned char>& encoded_image) {
if (encoded_image.empty()) {
RunCompletionCallback(false);
return;
}
::ambient::PhotoCacheEntry cache_entry;
cache_entry.mutable_primary_photo()->mutable_image()->assign(
reinterpret_cast<const char*>(encoded_image.data()),
encoded_image.size());
ambient_photo_cache::WritePhotoCache(
ambient_photo_cache::Store::kBackup, cache_idx_, cache_entry,
base::BindOnce(&AmbientBackupPhotoDownloader::RunCompletionCallback,
weak_factory_.GetWeakPtr(), true));
}
} // namespace ash
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