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/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <ApplicationServices/ApplicationServices.h>
#include <Cocoa/Cocoa.h>
#include <CoreFoundation/CoreFoundation.h>
#include <utility>
#include "api/scoped_refptr.h"
#include "modules/desktop_capture/desktop_capture_options.h"
#include "modules/desktop_capture/desktop_capturer.h"
#include "modules/desktop_capture/desktop_frame.h"
#include "modules/desktop_capture/mac/desktop_configuration.h"
#include "modules/desktop_capture/mac/desktop_configuration_monitor.h"
#include "modules/desktop_capture/mac/desktop_frame_cgimage.h"
#include "modules/desktop_capture/mac/window_list_utils.h"
#include "modules/desktop_capture/window_finder_mac.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/trace_event.h"
namespace webrtc {
namespace {
// Returns true if the window exists.
bool IsWindowValid(CGWindowID id) {
CFArrayRef window_id_array =
CFArrayCreate(nullptr, reinterpret_cast<const void**>(&id), 1, nullptr);
CFArrayRef window_array =
CGWindowListCreateDescriptionFromArray(window_id_array);
bool valid = window_array && CFArrayGetCount(window_array);
CFRelease(window_id_array);
CFRelease(window_array);
return valid;
}
class WindowCapturerMac : public DesktopCapturer {
public:
explicit WindowCapturerMac(
rtc::scoped_refptr<FullScreenWindowDetector> full_screen_window_detector,
rtc::scoped_refptr<DesktopConfigurationMonitor> configuration_monitor);
~WindowCapturerMac() override;
WindowCapturerMac(const WindowCapturerMac&) = delete;
WindowCapturerMac& operator=(const WindowCapturerMac&) = delete;
// DesktopCapturer interface.
void Start(Callback* callback) override;
void CaptureFrame() override;
bool GetSourceList(SourceList* sources) override;
bool SelectSource(SourceId id) override;
bool FocusOnSelectedSource() override;
bool IsOccluded(const DesktopVector& pos) override;
private:
Callback* callback_ = nullptr;
// The window being captured.
CGWindowID window_id_ = 0;
rtc::scoped_refptr<FullScreenWindowDetector> full_screen_window_detector_;
const rtc::scoped_refptr<DesktopConfigurationMonitor> configuration_monitor_;
WindowFinderMac window_finder_;
// Used to make sure that we only log the usage of fullscreen detection once.
bool fullscreen_usage_logged_ = false;
};
WindowCapturerMac::WindowCapturerMac(
rtc::scoped_refptr<FullScreenWindowDetector> full_screen_window_detector,
rtc::scoped_refptr<DesktopConfigurationMonitor> configuration_monitor)
: full_screen_window_detector_(std::move(full_screen_window_detector)),
configuration_monitor_(std::move(configuration_monitor)),
window_finder_(configuration_monitor_) {}
WindowCapturerMac::~WindowCapturerMac() {}
bool WindowCapturerMac::GetSourceList(SourceList* sources) {
return webrtc::GetWindowList(sources, true, true);
}
bool WindowCapturerMac::SelectSource(SourceId id) {
if (!IsWindowValid(id))
return false;
window_id_ = id;
return true;
}
bool WindowCapturerMac::FocusOnSelectedSource() {
if (!window_id_)
return false;
CGWindowID ids[1];
ids[0] = window_id_;
CFArrayRef window_id_array =
CFArrayCreate(nullptr, reinterpret_cast<const void**>(&ids), 1, nullptr);
CFArrayRef window_array =
CGWindowListCreateDescriptionFromArray(window_id_array);
if (!window_array || 0 == CFArrayGetCount(window_array)) {
// Could not find the window. It might have been closed.
RTC_LOG(LS_INFO) << "Window not found";
CFRelease(window_id_array);
return false;
}
CFDictionaryRef window = reinterpret_cast<CFDictionaryRef>(
CFArrayGetValueAtIndex(window_array, 0));
CFNumberRef pid_ref = reinterpret_cast<CFNumberRef>(
CFDictionaryGetValue(window, kCGWindowOwnerPID));
int pid;
CFNumberGetValue(pid_ref, kCFNumberIntType, &pid);
// TODO(jiayl): this will bring the process main window to the front. We
// should find a way to bring only the window to the front.
bool result =
[[NSRunningApplication runningApplicationWithProcessIdentifier:pid] activateWithOptions:0];
CFRelease(window_id_array);
CFRelease(window_array);
return result;
}
bool WindowCapturerMac::IsOccluded(const DesktopVector& pos) {
DesktopVector sys_pos = pos;
if (configuration_monitor_) {
auto configuration = configuration_monitor_->desktop_configuration();
sys_pos = pos.add(configuration.bounds.top_left());
}
return window_finder_.GetWindowUnderPoint(sys_pos) != window_id_;
}
void WindowCapturerMac::Start(Callback* callback) {
RTC_DCHECK(!callback_);
RTC_DCHECK(callback);
callback_ = callback;
}
void WindowCapturerMac::CaptureFrame() {
TRACE_EVENT0("webrtc", "WindowCapturerMac::CaptureFrame");
if (!IsWindowValid(window_id_)) {
RTC_LOG(LS_ERROR) << "The window is not valid any longer.";
callback_->OnCaptureResult(Result::ERROR_PERMANENT, nullptr);
return;
}
CGWindowID on_screen_window = window_id_;
if (full_screen_window_detector_) {
full_screen_window_detector_->UpdateWindowListIfNeeded(
window_id_, [](DesktopCapturer::SourceList* sources) {
// Not using webrtc::GetWindowList(sources, true, false)
// as it doesn't allow to have in the result window with
// empty title along with titled window owned by the same pid.
return webrtc::GetWindowList(
[sources](CFDictionaryRef window) {
WindowId window_id = GetWindowId(window);
int pid = GetWindowOwnerPid(window);
if (window_id != kNullWindowId) {
sources->push_back(DesktopCapturer::Source{window_id, pid, GetWindowTitle(window)});
}
return true;
},
true,
false);
});
CGWindowID full_screen_window = full_screen_window_detector_->FindFullScreenWindow(window_id_);
if (full_screen_window != kCGNullWindowID) {
// If this is the first time this happens, report to UMA that the feature is active.
if (!fullscreen_usage_logged_) {
LogDesktopCapturerFullscreenDetectorUsage();
fullscreen_usage_logged_ = true;
}
on_screen_window = full_screen_window;
}
}
std::unique_ptr<DesktopFrame> frame = DesktopFrameCGImage::CreateForWindow(on_screen_window);
if (!frame) {
RTC_LOG(LS_WARNING) << "Temporarily failed to capture window.";
callback_->OnCaptureResult(Result::ERROR_TEMPORARY, nullptr);
return;
}
frame->mutable_updated_region()->SetRect(
DesktopRect::MakeSize(frame->size()));
frame->set_top_left(GetWindowBounds(on_screen_window).top_left());
float scale_factor = GetWindowScaleFactor(window_id_, frame->size());
frame->set_dpi(DesktopVector(kStandardDPI * scale_factor, kStandardDPI * scale_factor));
callback_->OnCaptureResult(Result::SUCCESS, std::move(frame));
}
} // namespace
// static
std::unique_ptr<DesktopCapturer> DesktopCapturer::CreateRawWindowCapturer(
const DesktopCaptureOptions& options) {
return std::unique_ptr<DesktopCapturer>(new WindowCapturerMac(
options.full_screen_window_detector(), options.configuration_monitor()));
}
} // namespace webrtc
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