Desktop capture: introduce capturer requesting both screen and windows

When PipeWire and xdg-desktop-portals are used, we can actually combine
both source types into one request. Make this part of the API for those
who want to use it this way, e.g. Firefox or Electron, otherwise they
will end up making two simultaneous requests, resulting into two dialogs
at the same time asking, while they can be combined into just one.

Bug: webrtc:15363
Change-Id: Ib6e1e47f66cb01d5c65096aec378b44c3af5f387
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/311549
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Jan Grulich <grulja@gmail.com>
Cr-Commit-Position: refs/heads/main@{#40425}

modules/desktop_capture/desktop_capture_types.h

@@ -15,7 +15,7 @@
 
 namespace webrtc {
 
-enum class CaptureType { kWindow, kScreen };
+enum class CaptureType { kWindow, kScreen, kAnyScreenContent };
 
 // Type used to identify windows on the desktop. Values are platform-specific:
 //   - On Windows: HWND cast to intptr_t.

modules/desktop_capture/desktop_capturer.cc

@@ -26,6 +26,10 @@
 #include "rtc_base/win/windows_version.h"
 #endif  // defined(RTC_ENABLE_WIN_WGC)
 
+#if defined(WEBRTC_USE_PIPEWIRE)
+#include "modules/desktop_capture/linux/wayland/base_capturer_pipewire.h"
+#endif
+
 namespace webrtc {
 
 void LogDesktopCapturerFullscreenDetectorUsage() {
@@ -103,6 +107,25 @@ std::unique_ptr<DesktopCapturer> DesktopCapturer::CreateScreenCapturer(
   return capturer;
 }
 
+// static
+std::unique_ptr<DesktopCapturer> DesktopCapturer::CreateGenericCapturer(
+    const DesktopCaptureOptions& options) {
+  std::unique_ptr<DesktopCapturer> capturer;
+
+#if defined(WEBRTC_USE_PIPEWIRE)
+  if (options.allow_pipewire() && DesktopCapturer::IsRunningUnderWayland()) {
+    capturer = std::make_unique<BaseCapturerPipeWire>(
+        options, CaptureType::kAnyScreenContent);
+  }
+
+  if (capturer && options.detect_updated_region()) {
+    capturer.reset(new DesktopCapturerDifferWrapper(std::move(capturer)));
+  }
+#endif  // defined(WEBRTC_USE_PIPEWIRE)
+
+  return capturer;
+}
+
 #if defined(WEBRTC_USE_PIPEWIRE) || defined(WEBRTC_USE_X11)
 bool DesktopCapturer::IsRunningUnderWayland() {
   const char* xdg_session_type = getenv("XDG_SESSION_TYPE");

modules/desktop_capture/desktop_capturer.h

@@ -186,6 +186,11 @@ class RTC_EXPORT DesktopCapturer {
   static std::unique_ptr<DesktopCapturer> CreateScreenCapturer(
       const DesktopCaptureOptions& options);
 
+  // Creates a DesktopCapturer instance which targets to capture windows and
+  // screens.
+  static std::unique_ptr<DesktopCapturer> CreateGenericCapturer(
+      const DesktopCaptureOptions& options);
+
 #if defined(WEBRTC_USE_PIPEWIRE) || defined(WEBRTC_USE_X11)
   static bool IsRunningUnderWayland();
 

modules/desktop_capture/linux/wayland/screencast_portal.cc

@@ -41,6 +41,8 @@ ScreenCastPortal::CaptureSourceType ScreenCastPortal::ToCaptureSourceType(
       return ScreenCastPortal::CaptureSourceType::kScreen;
     case CaptureType::kWindow:
       return ScreenCastPortal::CaptureSourceType::kWindow;
+    case CaptureType::kAnyScreenContent:
+      return ScreenCastPortal::CaptureSourceType::kAnyScreenContent;
   }
 }