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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/ui/views/desktop_capture/share_this_tab_source_view.h"
#include "base/task/bind_post_task.h"
#include "base/task/thread_pool.h"
#include "chrome/browser/favicon/favicon_utils.h"
#include "chrome/browser/media/webrtc/desktop_media_picker_utils.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/render_widget_host_view.h"
#include "media/base/video_util.h"
#include "ui/base/metadata/metadata_impl_macros.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/skia_conversions.h"
#include "ui/gfx/image/image_skia_operations.h"
#include "ui/gfx/text_constants.h"
#include "ui/views/layout/box_layout.h"
#include "ui/views/layout/layout_provider.h"
namespace {
// Base UI measurements
constexpr int kPreviewWidth = 320;
constexpr int kPreviewHeight = 240;
constexpr int kPadding = 8;
constexpr int kFaviconWidth = 16;
constexpr int kFaviconTabTitleRowHeight = 20;
// Derived UI measurements
constexpr gfx::Rect kPreviewRect(kPadding,
kPadding,
kPreviewWidth,
kPreviewHeight);
// TODO(crbug.com/40268977): Align favicon height properly with label.
constexpr gfx::Rect kFaviconRect(kPadding,
kPreviewRect.bottom() + kPadding,
kFaviconWidth,
kFaviconTabTitleRowHeight);
constexpr gfx::Rect kTabTitleMaxRect(kFaviconRect.right() + kPadding,
kPreviewRect.bottom() + kPadding,
kPreviewWidth - kFaviconWidth - kPadding,
kFaviconTabTitleRowHeight);
constexpr base::TimeDelta kUpdatePeriodMs = base::Milliseconds(250);
void HandleCapturedBitmap(
base::OnceCallback<void(uint32_t, const std::optional<gfx::ImageSkia>&)>
reply,
std::optional<uint32_t> last_hash,
gfx::Size thumbnail_size,
const SkBitmap& bitmap) {
CHECK(!thumbnail_size.IsEmpty());
std::optional<gfx::ImageSkia> image;
// Only scale and update if the frame appears to be new.
const uint32_t hash = base::FastHash(base::span(
static_cast<uint8_t*>(bitmap.getPixels()), bitmap.computeByteSize()));
if (!last_hash.has_value() || hash != last_hash.value()) {
image = ScaleBitmap(bitmap, thumbnail_size);
}
content::GetUIThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(std::move(reply), hash, image));
}
} // namespace
ShareThisTabSourceView::ShareThisTabSourceView(
base::WeakPtr<content::WebContents> web_contents)
: web_contents_(web_contents),
thumbnail_task_runner_(base::ThreadPool::CreateSequencedTaskRunner(
{base::MayBlock(), base::TaskPriority::USER_VISIBLE})) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
CHECK(web_contents_);
constexpr int kThrobberRadius = 14;
constexpr gfx::Rect kThrobberRect(
kPadding + kPreviewWidth / 2 - kThrobberRadius,
kPadding + kPreviewHeight / 2 - kThrobberRadius, 2 * kThrobberRadius,
2 * kThrobberRadius);
throbber_ = AddChildView(std::make_unique<views::Throbber>());
throbber_->SetBoundsRect(kThrobberRect);
throbber_->Start();
image_view_ = AddChildView(std::make_unique<views::ImageView>());
image_view_->SetCanProcessEventsWithinSubtree(false);
image_view_->SetCornerRadius(
views::LayoutProvider::Get()->GetCornerRadiusMetric(
views::Emphasis::kMedium));
image_view_->SetVisible(false);
image_view_->SetBoundsRect(kPreviewRect);
favicon_view_ = AddChildView(std::make_unique<views::ImageView>());
favicon_view_->SetBoundsRect(kFaviconRect);
tab_title_label_ = AddChildView(std::make_unique<views::Label>());
tab_title_label_->SetBoundsRect(kTabTitleMaxRect);
tab_title_label_->SetHorizontalAlignment(
gfx::HorizontalAlignment::ALIGN_LEFT);
tab_title_label_->SetVerticalAlignment(gfx::VerticalAlignment::ALIGN_MIDDLE);
tab_title_label_->SetElideBehavior(gfx::ElideBehavior::ELIDE_TAIL);
UpdateFaviconAndTabTitle();
}
ShareThisTabSourceView::~ShareThisTabSourceView() = default;
void ShareThisTabSourceView::Activate() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
throbber_->Stop();
throbber_->SetVisible(false);
image_view_->SetVisible(true);
refreshing_ = true;
Refresh();
}
void ShareThisTabSourceView::StopRefreshing() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
refreshing_ = false;
}
gfx::Size ShareThisTabSourceView::CalculatePreferredSize(
const views::SizeBounds& /*available_size*/) const {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
// TODO(crbug.com/40262420): Use distances from LayoutProvider
return gfx::Size(kPreviewWidth + 2 * kPadding,
kTabTitleMaxRect.bottom() + kPadding);
}
void ShareThisTabSourceView::UpdateFaviconAndTabTitle() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
if (!web_contents_) {
return;
}
const gfx::Image favicon =
favicon::TabFaviconFromWebContents(web_contents_.get());
favicon_view_->SetImage(ui::ImageModel::FromImage(
favicon.IsEmpty() ? favicon::GetDefaultFavicon() : favicon));
tab_title_label_->SetText(web_contents_->GetTitle());
}
void ShareThisTabSourceView::Refresh() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
if (!refreshing_) {
return; // No further refreshes scheduled.
}
content::RenderFrameHost* const host = web_contents_->GetPrimaryMainFrame();
if (!host) {
return;
}
content::RenderWidgetHostView* const view = host->GetView();
if (!view) {
return;
}
auto reply = base::BindOnce(&ShareThisTabSourceView::OnCaptureHandled,
weak_factory_.GetWeakPtr());
view->CopyFromSurface(
gfx::Rect(), gfx::Size(),
base::BindPostTask(thumbnail_task_runner_,
base::BindOnce(&HandleCapturedBitmap, std::move(reply),
last_hash_, kPreviewRect.size())));
}
void ShareThisTabSourceView::OnCaptureHandled(
uint32_t hash,
const std::optional<gfx::ImageSkia>& image) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
CHECK((hash != last_hash_) == image.has_value()); // Only new frames passed.
UpdateFaviconAndTabTitle();
if (hash != last_hash_) {
last_hash_ = hash;
image_view_->SetImage(ui::ImageModel::FromImageSkia(image.value()));
}
content::GetUIThreadTaskRunner({})->PostDelayedTask(
FROM_HERE,
base::BindOnce(&ShareThisTabSourceView::Refresh,
weak_factory_.GetWeakPtr()),
kUpdatePeriodMs);
}
BEGIN_METADATA(ShareThisTabSourceView)
END_METADATA
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