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// Copyright 2025 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/glic/host/context/glic_tab_data.h"
#include <cstdint>
#include <optional>
#include <utility>
// #include <cstring>
#include "base/check_op.h"
#include "base/containers/span.h"
#include "base/memory/weak_ptr.h"
#include "base/strings/utf_string_conversions.h"
#include "components/favicon/content/content_favicon_driver.h"
#include "components/favicon/core/favicon_driver_observer.h"
#include "components/sessions/content/session_tab_helper.h"
#include "content/public/browser/web_contents.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_rep.h"
namespace glic {
namespace {
bool IsForeground(content::Visibility visibility) {
return visibility != content::Visibility::HIDDEN;
}
} // namespace
TabDataObserver::TabDataObserver(
content::WebContents* web_contents,
base::RepeatingCallback<void(glic::mojom::TabDataPtr)> tab_data_changed)
: content::WebContentsObserver(web_contents),
tab_data_changed_(std::move(tab_data_changed)) {
if (web_contents) {
auto* favicon_driver =
favicon::ContentFaviconDriver::FromWebContents(web_contents);
if (favicon_driver) {
favicon_driver->AddObserver(this);
}
tab_detach_subscription_ =
tabs::TabInterface::GetFromContents(web_contents)
->RegisterWillDetach(base::BindRepeating(
&TabDataObserver::OnTabWillDetach, base::Unretained(this)));
}
}
TabDataObserver::~TabDataObserver() {
ClearObservation();
}
void TabDataObserver::ClearObservation() {
// If the web contents is destroyed, web_contents() returns null. The favicon
// driver is owned by the web contents, so it's not necessary to remove our
// observer if the web contents is destroyed.
// Note, we do not used a scoped observation because there is no event
// notifying us when a web contents is destroyed.
if (web_contents()) {
auto* favicon_driver =
favicon::ContentFaviconDriver::FromWebContents(web_contents());
if (favicon_driver) {
favicon_driver->RemoveObserver(this);
}
}
Observe(nullptr);
tab_detach_subscription_ = {};
}
void TabDataObserver::PrimaryPageChanged(content::Page& page) {
SendUpdate();
}
void TabDataObserver::TitleWasSetForMainFrame(
content::RenderFrameHost* render_frame_host) {
SendUpdate();
}
void TabDataObserver::SendUpdate() {
tab_data_changed_.Run(CreateTabData(web_contents()));
}
void TabDataObserver::OnFaviconUpdated(
favicon::FaviconDriver* favicon_driver,
NotificationIconType notification_icon_type,
const GURL& icon_url,
bool icon_url_changed,
const gfx::Image& image) {
SendUpdate();
}
void TabDataObserver::OnTabWillDetach(tabs::TabInterface* tab,
tabs::TabInterface::DetachReason reason) {
if (reason == tabs::TabInterface::DetachReason::kDelete) {
ClearObservation();
}
}
int GetTabId(content::WebContents* web_contents) {
tabs::TabInterface* tab =
tabs::TabInterface::MaybeGetFromContents(web_contents);
if (tab) {
return tab->GetHandle().raw_value();
} else {
return tabs::TabHandle::Null().raw_value();
}
}
const GURL& GetTabUrl(content::WebContents* web_contents) {
return web_contents->GetLastCommittedURL();
}
// CreateTabData Implementation:
glic::mojom::TabDataPtr CreateTabData(content::WebContents* web_contents) {
if (!web_contents) {
return nullptr;
}
SkBitmap favicon;
auto* favicon_driver =
favicon::ContentFaviconDriver::FromWebContents(web_contents);
if (favicon_driver && favicon_driver->FaviconIsValid()) {
// Attempt to get a 32x32 favicon by default (16x16 DIP at 2x scale).
favicon = favicon_driver->GetFavicon()
.ToImageSkia()
->GetRepresentation(2.0f)
.GetBitmap();
}
// TODO(b/426644734): investigate triggering updates due to changes to
// observability for focused tab data.
bool is_audible = web_contents->IsCurrentlyAudible();
bool is_foreground = IsForeground(web_contents->GetVisibility());
bool is_observable = is_audible || is_foreground;
return glic::mojom::TabData::New(
GetTabId(web_contents),
sessions::SessionTabHelper::IdForWindowContainingTab(web_contents).id(),
GetTabUrl(web_contents), base::UTF16ToUTF8(web_contents->GetTitle()),
favicon, web_contents->GetContentsMimeType(), is_observable);
}
// CreateFocusedTabData Implementation:
glic::mojom::FocusedTabDataPtr CreateFocusedTabData(
const FocusedTabData& focused_tab_data) {
if (focused_tab_data.is_focus()) {
return mojom::FocusedTabData::NewFocusedTab(
CreateTabData(focused_tab_data.focus()->GetContents()));
}
return mojom::FocusedTabData::NewNoFocusedTabData(
mojom::NoFocusedTabData::New(
CreateTabData(focused_tab_data.unfocused_tab()
? focused_tab_data.unfocused_tab()->GetContents()
: nullptr),
focused_tab_data.GetFocus().error()));
}
FocusedTabData::FocusedTabData(tabs::TabInterface* tab) : data_(tab) {}
FocusedTabData::FocusedTabData(const std::string& error,
tabs::TabInterface* unfocused_tab)
: data_(error), unfocused_tab_(unfocused_tab) {}
FocusedTabData::~FocusedTabData() = default;
base::expected<tabs::TabInterface*, std::string> FocusedTabData::GetFocus()
const {
if (is_focus()) {
return focus();
}
return base::unexpected(std::get<1>(data_));
}
bool FaviconEquals(const ::SkBitmap& a, const ::SkBitmap& b) {
if (&a == &b) {
return true;
}
// Compare image properties.
if (a.info() != b.info()) {
return false;
}
// Compare image pixels.
for (int y = 0; y < a.height(); ++y) {
for (int x = 0; x < a.width(); ++x) {
if (a.getColor(x, y) != b.getColor(x, y)) {
return false;
}
}
}
return true;
}
} // namespace glic
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