| /* |
| * Copyright (c) 2019 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 "modules/desktop_capture/win/full_screen_win_application_handler.h" |
| |
| #include <algorithm> |
| #include <memory> |
| #include <string> |
| #include <vector> |
| |
| #include "absl/strings/ascii.h" |
| #include "absl/strings/match.h" |
| #include "modules/desktop_capture/win/screen_capture_utils.h" |
| #include "modules/desktop_capture/win/window_capture_utils.h" |
| #include "rtc_base/arraysize.h" |
| #include "rtc_base/logging.h" // For RTC_LOG_GLE |
| #include "rtc_base/string_utils.h" |
| |
| namespace webrtc { |
| namespace { |
| |
| // Utility function to verify that `window` has class name equal to `class_name` |
| bool CheckWindowClassName(HWND window, const wchar_t* class_name) { |
| const size_t classNameLength = wcslen(class_name); |
| |
| // https://docs.microsoft.com/en-us/windows/win32/api/winuser/ns-winuser-wndclassa |
| // says lpszClassName field in WNDCLASS is limited by 256 symbols, so we don't |
| // need to have a buffer bigger than that. |
| constexpr size_t kMaxClassNameLength = 256; |
| WCHAR buffer[kMaxClassNameLength]; |
| |
| const int length = ::GetClassNameW(window, buffer, kMaxClassNameLength); |
| if (length <= 0) |
| return false; |
| |
| if (static_cast<size_t>(length) != classNameLength) |
| return false; |
| return wcsncmp(buffer, class_name, classNameLength) == 0; |
| } |
| |
| std::string WindowText(HWND window) { |
| size_t len = ::GetWindowTextLength(window); |
| if (len == 0) |
| return std::string(); |
| |
| std::vector<wchar_t> buffer(len + 1, 0); |
| size_t copied = ::GetWindowTextW(window, buffer.data(), buffer.size()); |
| if (copied == 0) |
| return std::string(); |
| return rtc::ToUtf8(buffer.data(), copied); |
| } |
| |
| DWORD WindowProcessId(HWND window) { |
| DWORD dwProcessId = 0; |
| ::GetWindowThreadProcessId(window, &dwProcessId); |
| return dwProcessId; |
| } |
| |
| std::wstring FileNameFromPath(const std::wstring& path) { |
| auto found = path.rfind(L"\\"); |
| if (found == std::string::npos) |
| return path; |
| return path.substr(found + 1); |
| } |
| |
| // Returns windows which belong to given process id |
| // `sources` is a full list of available windows |
| // `processId` is a process identifier (window owner) |
| // `window_to_exclude` is a window to be exluded from result |
| DesktopCapturer::SourceList GetProcessWindows( |
| const DesktopCapturer::SourceList& sources, |
| DWORD processId, |
| HWND window_to_exclude) { |
| DesktopCapturer::SourceList result; |
| std::copy_if(sources.begin(), sources.end(), std::back_inserter(result), |
| [&](DesktopCapturer::Source source) { |
| const HWND source_hwnd = reinterpret_cast<HWND>(source.id); |
| return window_to_exclude != source_hwnd && |
| WindowProcessId(source_hwnd) == processId; |
| }); |
| return result; |
| } |
| |
| class FullScreenPowerPointHandler : public FullScreenApplicationHandler { |
| public: |
| explicit FullScreenPowerPointHandler(DesktopCapturer::SourceId sourceId) |
| : FullScreenApplicationHandler(sourceId) {} |
| |
| ~FullScreenPowerPointHandler() override {} |
| |
| DesktopCapturer::SourceId FindFullScreenWindow( |
| const DesktopCapturer::SourceList& window_list, |
| int64_t timestamp) const override { |
| if (window_list.empty()) |
| return 0; |
| |
| HWND original_window = reinterpret_cast<HWND>(GetSourceId()); |
| DWORD process_id = WindowProcessId(original_window); |
| |
| DesktopCapturer::SourceList powerpoint_windows = |
| GetProcessWindows(window_list, process_id, original_window); |
| |
| if (powerpoint_windows.empty()) |
| return 0; |
| |
| if (GetWindowType(original_window) != WindowType::kEditor) |
| return 0; |
| |
| const auto original_document = GetDocumentFromEditorTitle(original_window); |
| |
| for (const auto& source : powerpoint_windows) { |
| HWND window = reinterpret_cast<HWND>(source.id); |
| |
| // Looking for slide show window for the same document |
| if (GetWindowType(window) != WindowType::kSlideShow || |
| GetDocumentFromSlideShowTitle(window) != original_document) { |
| continue; |
| } |
| |
| return source.id; |
| } |
| |
| return 0; |
| } |
| |
| private: |
| enum class WindowType { kEditor, kSlideShow, kOther }; |
| |
| WindowType GetWindowType(HWND window) const { |
| if (IsEditorWindow(window)) |
| return WindowType::kEditor; |
| else if (IsSlideShowWindow(window)) |
| return WindowType::kSlideShow; |
| else |
| return WindowType::kOther; |
| } |
| |
| constexpr static char kDocumentTitleSeparator[] = " - "; |
| |
| std::string GetDocumentFromEditorTitle(HWND window) const { |
| std::string title = WindowText(window); |
| auto position = title.find(kDocumentTitleSeparator); |
| return std::string(absl::StripAsciiWhitespace( |
| absl::string_view(title).substr(0, position))); |
| } |
| |
| std::string GetDocumentFromSlideShowTitle(HWND window) const { |
| std::string title = WindowText(window); |
| auto left_pos = title.find(kDocumentTitleSeparator); |
| auto right_pos = title.rfind(kDocumentTitleSeparator); |
| constexpr size_t kSeparatorLength = arraysize(kDocumentTitleSeparator) - 1; |
| if (left_pos == std::string::npos || right_pos == std::string::npos) |
| return title; |
| |
| if (right_pos > left_pos + kSeparatorLength) { |
| auto result_len = right_pos - left_pos - kSeparatorLength; |
| auto document = absl::string_view(title).substr( |
| left_pos + kSeparatorLength, result_len); |
| return std::string(absl::StripAsciiWhitespace(document)); |
| } else { |
| auto document = absl::string_view(title).substr( |
| left_pos + kSeparatorLength, std::wstring::npos); |
| return std::string(absl::StripAsciiWhitespace(document)); |
| } |
| } |
| |
| bool IsEditorWindow(HWND window) const { |
| return CheckWindowClassName(window, L"PPTFrameClass"); |
| } |
| |
| bool IsSlideShowWindow(HWND window) const { |
| const LONG style = ::GetWindowLong(window, GWL_STYLE); |
| const bool min_box = WS_MINIMIZEBOX & style; |
| const bool max_box = WS_MAXIMIZEBOX & style; |
| return !min_box && !max_box; |
| } |
| }; |
| |
| class OpenOfficeApplicationHandler : public FullScreenApplicationHandler { |
| public: |
| explicit OpenOfficeApplicationHandler(DesktopCapturer::SourceId sourceId) |
| : FullScreenApplicationHandler(sourceId) {} |
| |
| DesktopCapturer::SourceId FindFullScreenWindow( |
| const DesktopCapturer::SourceList& window_list, |
| int64_t timestamp) const override { |
| if (window_list.empty()) |
| return 0; |
| |
| DWORD process_id = WindowProcessId(reinterpret_cast<HWND>(GetSourceId())); |
| |
| DesktopCapturer::SourceList app_windows = |
| GetProcessWindows(window_list, process_id, nullptr); |
| |
| DesktopCapturer::SourceList document_windows; |
| std::copy_if( |
| app_windows.begin(), app_windows.end(), |
| std::back_inserter(document_windows), |
| [this](const DesktopCapturer::Source& x) { return IsEditorWindow(x); }); |
| |
| // Check if we have only one document window, otherwise it's not possible |
| // to securely match a document window and a slide show window which has |
| // empty title. |
| if (document_windows.size() != 1) { |
| return 0; |
| } |
| |
| // Check if document window has been selected as a source |
| if (document_windows.front().id != GetSourceId()) { |
| return 0; |
| } |
| |
| // Check if we have a slide show window. |
| auto slide_show_window = |
| std::find_if(app_windows.begin(), app_windows.end(), |
| [this](const DesktopCapturer::Source& x) { |
| return IsSlideShowWindow(x); |
| }); |
| |
| if (slide_show_window == app_windows.end()) |
| return 0; |
| |
| return slide_show_window->id; |
| } |
| |
| private: |
| bool IsEditorWindow(const DesktopCapturer::Source& source) const { |
| if (source.title.empty()) { |
| return false; |
| } |
| |
| return CheckWindowClassName(reinterpret_cast<HWND>(source.id), L"SALFRAME"); |
| } |
| |
| bool IsSlideShowWindow(const DesktopCapturer::Source& source) const { |
| // Check title size to filter out a Presenter Control window which shares |
| // window class with Slide Show window but has non empty title. |
| if (!source.title.empty()) { |
| return false; |
| } |
| |
| return CheckWindowClassName(reinterpret_cast<HWND>(source.id), |
| L"SALTMPSUBFRAME"); |
| } |
| }; |
| |
| std::wstring GetPathByWindowId(HWND window_id) { |
| DWORD process_id = WindowProcessId(window_id); |
| HANDLE process = |
| ::OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, process_id); |
| if (process == NULL) |
| return L""; |
| DWORD path_len = MAX_PATH; |
| WCHAR path[MAX_PATH]; |
| std::wstring result; |
| if (::QueryFullProcessImageNameW(process, 0, path, &path_len)) |
| result = std::wstring(path, path_len); |
| else |
| RTC_LOG_GLE(LS_ERROR) << "QueryFullProcessImageName failed."; |
| |
| ::CloseHandle(process); |
| return result; |
| } |
| |
| } // namespace |
| |
| std::unique_ptr<FullScreenApplicationHandler> |
| CreateFullScreenWinApplicationHandler(DesktopCapturer::SourceId source_id) { |
| std::unique_ptr<FullScreenApplicationHandler> result; |
| HWND hwnd = reinterpret_cast<HWND>(source_id); |
| std::wstring exe_path = GetPathByWindowId(hwnd); |
| std::wstring file_name = FileNameFromPath(exe_path); |
| std::transform(file_name.begin(), file_name.end(), file_name.begin(), |
| std::towupper); |
| |
| if (file_name == L"POWERPNT.EXE") { |
| result = std::make_unique<FullScreenPowerPointHandler>(source_id); |
| } else if (file_name == L"SOFFICE.BIN" && |
| absl::EndsWith(WindowText(hwnd), "OpenOffice Impress")) { |
| result = std::make_unique<OpenOfficeApplicationHandler>(source_id); |
| } |
| |
| return result; |
| } |
| |
| } // namespace webrtc |