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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/manta/walrus_provider.h"
#include <algorithm>
#include <cstdint>
#include "components/manta/features.h"
#include "third_party/skia/include/codec/SkJpegDecoder.h"
#include "third_party/skia/include/codec/SkPngDecoder.h"
#include "ui/gfx/codec/jpeg_codec.h"
#include "ui/gfx/codec/png_codec.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_operations.h"
namespace manta {
namespace {
constexpr char kOauthConsumerName[] = "manta_walrus";
constexpr base::TimeDelta kTimeout = base::Seconds(30);
// The maximum number of pixels after resizing an image.
constexpr int32_t kMaxPixelsAfterResizing = 512 * 512;
constexpr auto kTrafficAnnotation =
net::DefineNetworkTrafficAnnotation("chromeos_walrus_provider", R"(
semantics {
sender: "ChromeOS Walrus"
description:
"Requests the trust and safety verdict of images and text prompt "
"from the Mantis service."
trigger:
"User editing an image in the Gallery app with 'Edit with AI'"
internal {
contacts {
email: "cros-mantis@google.com"
}
}
user_data {
type: USER_CONTENT
}
data:
"The image user selected to edit in the gallery and the text prompt "
"typed in a editable text field. The generated images from the model "
"are also sent for the trust and safety verdict."
destination: GOOGLE_OWNED_SERVICE
last_reviewed: "2025-03-26"
}
policy {
cookies_allowed: NO
setting:
"User/Admin can enable or disable this feature via the Google "
"Admin Console by updating the GenAI Photo Editing settings. "
"The feature is enabled by default."
chrome_policy {
GenAIPhotoEditingSettings {
GenAIPhotoEditingSettings: 0
}
}
}
)");
void OnServerResponseOrErrorReceived(
MantaGenericCallback callback,
std::unique_ptr<proto::Response> manta_response,
MantaStatus manta_status) {
if (manta_response == nullptr || !manta_response->filtered_data_size()) {
// Return the status if the text/images are not blocked.
std::move(callback).Run(base::Value::Dict(), std::move(manta_status));
return;
}
CHECK(manta_response != nullptr);
// Add extra information for the invalid inputs.
auto output_data = base::Value::Dict();
for (const auto& filtered_data : manta_response->filtered_data()) {
auto filtered_reason = filtered_data.reason();
switch (filtered_reason) {
case manta::proto::FilteredReason::IMAGE_SAFETY:
output_data.Set("image_blocked", true);
break;
case manta::proto::FilteredReason::TEXT_SAFETY:
output_data.Set("text_blocked", true);
break;
default:
break;
}
}
std::move(callback).Run(std::move(output_data),
{manta::MantaStatusCode::kBlockedOutputs});
}
} // namespace
WalrusProvider::WalrusProvider(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory,
signin::IdentityManager* identity_manager,
const ProviderParams& provider_params)
: BaseProvider(url_loader_factory, identity_manager, provider_params) {}
WalrusProvider::WalrusProvider(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory,
signin::IdentityManager* identity_manager)
: BaseProvider(url_loader_factory, identity_manager) {}
WalrusProvider::~WalrusProvider() = default;
void WalrusProvider::Filter(std::string text_prompt,
MantaGenericCallback done_callback) {
std::vector<std::vector<uint8_t>> empty_images;
Filter(text_prompt, empty_images, std::move(done_callback));
}
std::optional<SkBitmap> DeserializeImage(const std::vector<uint8_t>& bytes) {
if (SkJpegDecoder::IsJpeg(bytes.data(), bytes.size())) {
return gfx::JPEGCodec::Decode(bytes);
}
if (SkPngDecoder::IsPng(bytes.data(), bytes.size())) {
return gfx::PNGCodec::Decode(bytes);
}
return std::nullopt;
}
// Downscales the given image maintaining the aspect ratio if the number of
// pixels exceeds |max_pixels_after_resizing|. If the image cannot be decoded or
// encoded, returns null.
std::optional<std::vector<uint8_t>> WalrusProvider::DownscaleImageIfNeeded(
const std::vector<uint8_t>& image_bytes,
int32_t max_pixels_after_resizing = kMaxPixelsAfterResizing) {
auto bitmap = DeserializeImage(image_bytes);
if (!bitmap.has_value() || bitmap->height() == 0 || bitmap->width() == 0) {
return std::nullopt;
}
// (height * scale) * (width * scale) = max_pixels_after_resizing
// scale = sqrt(max_pixels_after_resizing / (height * width))
double scale = std::sqrt(static_cast<double>(max_pixels_after_resizing) /
(bitmap->height() * bitmap->width()));
scale = std::min(1.0, scale);
SkBitmap resized_bitmap = skia::ImageOperations::Resize(
bitmap.value(), skia::ImageOperations::RESIZE_BEST,
scale * bitmap->width(), scale * bitmap->height());
return gfx::JPEGCodec::Encode(resized_bitmap, /*quality=*/90);
}
std::string GetImageTypeTag(WalrusProvider::ImageType image_type) {
switch (image_type) {
case WalrusProvider::ImageType::kInputImage:
return "input_image";
case WalrusProvider::ImageType::kOutputImage:
return "output_image";
case WalrusProvider::ImageType::kGeneratedRegion:
return "generated_region";
case WalrusProvider::ImageType::kGeneratedRegionOutpainting:
return "generated_region_outpainting";
default:
return "input_image";
}
}
void WalrusProvider::Filter(const std::optional<std::string>& text_prompt,
const std::vector<std::vector<uint8_t>>& images,
MantaGenericCallback done_callback) {
std::vector<ImageType> image_types(images.size(), ImageType::kInputImage);
Filter(text_prompt, images, image_types, std::move(done_callback));
}
void WalrusProvider::Filter(const std::optional<std::string>& text_prompt,
const std::vector<std::vector<uint8_t>>& images,
const std::vector<ImageType>& image_types,
MantaGenericCallback done_callback) {
if (images.size() != image_types.size()) {
std::move(done_callback)
.Run(base::Value::Dict(), {MantaStatusCode::kInvalidInput});
return;
}
proto::Request request;
request.set_feature_name(proto::FeatureName::CHROMEOS_WALRUS);
if (text_prompt.has_value() && !text_prompt->empty()) {
auto* input_data = request.add_input_data();
input_data->set_tag("input_text");
input_data->set_text(text_prompt.value());
}
for (size_t i = 0; i < images.size(); ++i) {
const std::vector<uint8_t>& image = images[i];
const ImageType& image_type = image_types[i];
auto* input_data = request.add_input_data();
input_data->set_tag(GetImageTypeTag(image_type));
auto resized_image_bytes = DownscaleImageIfNeeded(image);
if (resized_image_bytes.has_value()) {
input_data->mutable_image()->set_serialized_bytes(
std::string(resized_image_bytes.value().begin(),
resized_image_bytes.value().end()));
} else {
input_data->mutable_image()->set_serialized_bytes(
std::string(image.begin(), image.end()));
}
}
if (!request.input_data_size()) {
std::move(done_callback)
.Run(base::Value::Dict(), {MantaStatusCode::kInvalidInput});
return;
}
RequestInternal(
GURL{GetProviderEndpoint(features::IsWalrusUseProdServerEnabled())},
kOauthConsumerName, kTrafficAnnotation, request, MantaMetricType::kWalrus,
base::BindOnce(&OnServerResponseOrErrorReceived,
std::move(done_callback)),
kTimeout);
}
} // namespace manta
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