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// Copyright 2021 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/media/webrtc/current_tab_desktop_media_list.h"
#include "base/functional/bind.h"
#include "base/hash/hash.h"
#include "base/task/bind_post_task.h"
#include "base/task/single_thread_task_runner.h"
#include "base/task/thread_pool.h"
#include "build/build_config.h"
#include "chrome/browser/media/webrtc/desktop_media_picker_utils.h"
#include "content/public/browser/browser_task_traits.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 "content/public/browser/web_contents.h"
#include "media/base/video_util.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkImage.h"
namespace {
constexpr base::TimeDelta kUpdatePeriodMs = base::Milliseconds(1000);
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) {
DCHECK(!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
CurrentTabDesktopMediaList ::CurrentTabDesktopMediaList(
content::WebContents* web_contents)
: CurrentTabDesktopMediaList(web_contents, kUpdatePeriodMs, nullptr) {}
CurrentTabDesktopMediaList::CurrentTabDesktopMediaList(
content::WebContents* web_contents,
base::TimeDelta period,
DesktopMediaListObserver* observer)
: DesktopMediaListBase(period),
media_id_(content::DesktopMediaID::TYPE_WEB_CONTENTS,
content::DesktopMediaID::kNullId,
content::WebContentsMediaCaptureId(
web_contents->GetPrimaryMainFrame()
->GetProcess()
->GetDeprecatedID(),
web_contents->GetPrimaryMainFrame()->GetRoutingID())),
thumbnail_task_runner_(base::ThreadPool::CreateSequencedTaskRunner(
{base::MayBlock(), base::TaskPriority::USER_VISIBLE})) {
DCHECK(web_contents);
type_ = DesktopMediaList::Type::kCurrentTab;
if (observer) {
StartUpdating(observer);
}
// The source never changes - it always applies to the current tab.
UpdateSourcesList({SourceDescription(media_id_, std::u16string())});
}
CurrentTabDesktopMediaList::~CurrentTabDesktopMediaList() = default;
void CurrentTabDesktopMediaList::Refresh(bool update_thumbnails) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(can_refresh());
if (refresh_in_progress_ || !update_thumbnails || thumbnail_size_.IsEmpty()) {
return;
}
content::RenderFrameHost* const host = content::RenderFrameHost::FromID(
media_id_.web_contents_id.render_process_id,
media_id_.web_contents_id.main_render_frame_id);
if (!host) {
return;
}
content::RenderWidgetHostView* const view = host->GetView();
if (!view) {
return;
}
refresh_in_progress_ = true;
auto reply = base::BindOnce(&CurrentTabDesktopMediaList::OnCaptureHandled,
weak_factory_.GetWeakPtr());
view->CopyFromSurface(
gfx::Rect(), gfx::Size(),
base::BindPostTask(thumbnail_task_runner_,
base::BindOnce(&HandleCapturedBitmap, std::move(reply),
last_hash_, thumbnail_size_)));
}
void CurrentTabDesktopMediaList::OnCaptureHandled(
uint32_t hash,
const std::optional<gfx::ImageSkia>& image) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK((hash != last_hash_) == image.has_value()); // Only new frames passed.
refresh_in_progress_ = false;
if (hash != last_hash_) {
last_hash_ = hash;
UpdateSourceThumbnail(media_id_, image.value());
}
OnRefreshComplete();
}
void CurrentTabDesktopMediaList::ResetLastHashForTesting() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
last_hash_.reset();
}
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