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// Copyright 2022 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/apps/app_service/app_icon/app_icon_decoder.h"
#include <functional>
#include "base/functional/bind.h"
#include "base/task/thread_pool.h"
#include "base/trace_event/trace_event.h"
#include "chrome/browser/apps/app_service/app_icon/app_icon_factory.h"
#include "chrome/browser/apps/app_service/app_icon/app_icon_util.h"
#include "chrome/browser/image_decoder/image_decoder.h"
#include "extensions/grit/extensions_browser_resources.h"
#include "services/data_decoder/public/cpp/data_decoder.h"
#include "services/data_decoder/public/cpp/decode_image.h"
#include "services/data_decoder/public/mojom/image_decoder.mojom.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/base/resource/resource_scale_factor.h"
#include "ui/gfx/codec/png_codec.h"
#include "ui/gfx/image/image_skia_operations.h"
#include "ui/gfx/image/image_skia_rep.h"
namespace apps {
AppIconDecoder::ImageSource::ImageSource(int32_t size_in_dip)
: size_in_dip_(size_in_dip) {}
AppIconDecoder::ImageSource::~ImageSource() = default;
gfx::ImageSkiaRep AppIconDecoder::ImageSource::GetImageForScale(float scale) {
TRACE_EVENT0("ui", "AppIconDecoder::ImageSource::GetImageForScale");
// Host loads icon asynchronously, so use default icon so far.
// Get the ImageSkia for the resource IDR_APP_DEFAULT_ICON and the size
// `size_in_dip_`.
return CreateResizedResourceImage(IDR_APP_DEFAULT_ICON, size_in_dip_)
.GetRepresentation(scale);
}
AppIconDecoder::AppIconDecoder(
const base::FilePath& base_path,
const std::string& app_id,
int32_t size_in_dip,
base::OnceCallback<void(AppIconDecoder* decoder, IconValuePtr iv)> callback)
: base_path_(base_path),
app_id_(app_id),
size_in_dip_(size_in_dip),
callback_(std::move(callback)) {}
AppIconDecoder::~AppIconDecoder() = default;
void AppIconDecoder::Start() {
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_VISIBLE},
base::BindOnce(&ReadIconFilesOnBackgroundThread, base_path_, app_id_,
size_in_dip_),
base::BindOnce(&AppIconDecoder::OnIconRead,
weak_ptr_factory_.GetWeakPtr()));
}
bool AppIconDecoder::SetScaleFactors(
const std::map<ui::ResourceScaleFactor, IconValuePtr>& icon_datas) {
TRACE_EVENT0("ui", "AppIconDecoder::SetScaleFactors");
for (const auto& [scale_factor, iv] : icon_datas) {
if (!iv || iv->icon_type != IconType::kCompressed) {
return false;
}
if (HasAdaptiveIconData(iv)) {
is_adaptive_icon_ = true;
foreground_incomplete_scale_factors_.insert(scale_factor);
background_incomplete_scale_factors_.insert(scale_factor);
} else if (iv->compressed.empty()) {
return false;
} else {
incomplete_scale_factors_.insert(scale_factor);
}
}
if (is_adaptive_icon_ && !incomplete_scale_factors_.empty()) {
// Some scales have non-adaptive icons. Then we can't generate the adaptive
// icon for all scales. Set `is_adaptive_icon_` as false, and decode the
// foreground images only for scales with adaptive icon data.
is_adaptive_icon_ = false;
for (const auto& [scale_factor, iv] : icon_datas) {
incomplete_scale_factors_.insert(scale_factor);
}
}
// Initialize the ImageSkia with placeholder bitmaps, and the correct icon
// size to generate the adaptive icon using CompositeImagesAndApplyMask, which
// checks the ImageSkia's size to chop for paddings and resize the image_reps.
gfx::Size image_size(size_in_dip_, size_in_dip_);
if (is_adaptive_icon_) {
foreground_image_skia_ =
gfx::ImageSkia(std::make_unique<ImageSource>(size_in_dip_), image_size);
background_image_skia_ =
gfx::ImageSkia(std::make_unique<ImageSource>(size_in_dip_), image_size);
} else {
image_skia_ =
gfx::ImageSkia(std::make_unique<ImageSource>(size_in_dip_), image_size);
}
return true;
}
void AppIconDecoder::OnIconRead(
std::map<ui::ResourceScaleFactor, IconValuePtr> icon_datas) {
TRACE_EVENT0("ui", "AppIconDecoder::OnIconRead");
// Check `icon_datas` to set scale factors.
if (!SetScaleFactors(icon_datas)) {
DiscardDecodeRequest();
return;
}
// Create DecodeRequest to decode images safely in a sandboxed service per
// security requests.
for (auto& [scale_factor, iv] : icon_datas) {
if (HasAdaptiveIconData(iv)) {
if (!is_adaptive_icon_) {
// If we can't generate the adaptive icon for all scales, decode the
// foreground images only to fill in `image_skia_`.
DecodeImage(scale_factor, std::move(iv->foreground_icon_png_data),
image_skia_, incomplete_scale_factors_);
continue;
}
// Decode for the foreground and background image.
DecodeImage(scale_factor, std::move(iv->foreground_icon_png_data),
foreground_image_skia_, foreground_incomplete_scale_factors_);
DecodeImage(scale_factor, std::move(iv->background_icon_png_data),
background_image_skia_, background_incomplete_scale_factors_);
continue;
}
is_maskable_icon_ = iv->is_maskable_icon;
DecodeImage(scale_factor, std::move(iv->compressed), image_skia_,
incomplete_scale_factors_);
}
}
void AppIconDecoder::DecodeImage(
ui::ResourceScaleFactor scale_factor,
std::vector<uint8_t> icon_data,
gfx::ImageSkia& image_skia,
std::set<ui::ResourceScaleFactor>& incomplete_scale_factors) {
data_decoder::DecodeImage(
&GetIconDataDecoder(), std::move(icon_data),
data_decoder::mojom::ImageCodec::kDefault,
/*shrink_to_fit=*/false, data_decoder::kDefaultMaxSizeInBytes,
/*desired_image_frame_size=*/gfx::Size(),
base::BindOnce(&AppIconDecoder::UpdateImageSkia,
weak_ptr_factory_.GetWeakPtr(), scale_factor,
std::ref(image_skia), std::ref(incomplete_scale_factors)));
}
void AppIconDecoder::UpdateImageSkia(
ui::ResourceScaleFactor scale_factor,
gfx::ImageSkia& image_skia,
std::set<ui::ResourceScaleFactor>& incomplete_scale_factors,
const SkBitmap& bitmap) {
TRACE_EVENT0("ui", "AppIconDecoder::UpdateImageSkia");
// If decoding any scale factor fails, discard the entire decode request.
if (bitmap.drawsNothing()) {
DiscardDecodeRequest();
return;
}
CHECK(ui::IsScaleFactorSupported(scale_factor));
gfx::ImageSkiaRep image_rep(bitmap,
ui::GetScaleForResourceScaleFactor(scale_factor));
image_skia.RemoveRepresentation(image_rep.scale());
image_skia.AddRepresentation(image_rep);
image_skia.RemoveUnsupportedRepresentationsForScale(image_rep.scale());
incomplete_scale_factors.erase(scale_factor);
// For the adaptive icon, generate the adaptive icon with the foreground and
// background icon images.
if (is_adaptive_icon_) {
if (foreground_incomplete_scale_factors_.empty() &&
background_incomplete_scale_factors_.empty()) {
auto image = apps::CompositeImagesAndApplyMask(foreground_image_skia_,
background_image_skia_);
image.MakeThreadSafe();
CompleteWithImageSkia(image);
}
return;
}
if (incomplete_scale_factors_.empty()) {
CompleteWithImageSkia(image_skia_);
}
}
void AppIconDecoder::DiscardDecodeRequest() {
// `callback_` is responsible for removing this AppIconDecoder object, which
// will cause all pending decode results to be dropped.
//
// Return an empty icon value, because the callers assume the icon value
// should never be nullptr.
std::move(callback_).Run(this, std::make_unique<apps::IconValue>());
}
void AppIconDecoder::CompleteWithImageSkia(const gfx::ImageSkia& image_skia) {
TRACE_EVENT0("ui", "AppIconDecoder::CompleteWithImageSkia");
// `callback_` is responsible for removing this AppIconDecoder object.
auto iv = std::make_unique<apps::IconValue>();
iv->icon_type = IconType::kUncompressed;
iv->uncompressed = image_skia;
iv->is_maskable_icon = is_maskable_icon_;
std::move(callback_).Run(this, std::move(iv));
}
} // namespace apps
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