| /* |
| * Copyright (c) 2016 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 <windows.h> |
| |
| #include <memory> |
| |
| #include "webrtc/modules/desktop_capture/screen_drawer.h" |
| |
| namespace webrtc { |
| |
| namespace { |
| |
| DesktopRect GetScreenRect() { |
| HDC hdc = GetDC(NULL); |
| DesktopRect rect = DesktopRect::MakeWH(GetDeviceCaps(hdc, HORZRES), |
| GetDeviceCaps(hdc, VERTRES)); |
| ReleaseDC(NULL, hdc); |
| return rect; |
| } |
| |
| HWND CreateDrawerWindow(DesktopRect rect) { |
| HWND hwnd = CreateWindowA( |
| "STATIC", "DrawerWindow", WS_POPUPWINDOW | WS_VISIBLE, rect.left(), |
| rect.top(), rect.width(), rect.height(), NULL, NULL, NULL, NULL); |
| SetForegroundWindow(hwnd); |
| return hwnd; |
| } |
| |
| // A ScreenDrawer implementation for Windows. |
| class ScreenDrawerWin : public ScreenDrawer { |
| public: |
| ScreenDrawerWin(); |
| ~ScreenDrawerWin() override; |
| |
| // ScreenDrawer interface. |
| DesktopRect DrawableRegion() override; |
| void DrawRectangle(DesktopRect rect, uint32_t rgba) override; |
| void Clear() override; |
| |
| private: |
| const DesktopRect rect_; |
| HWND window_; |
| HDC hdc_; |
| }; |
| |
| ScreenDrawerWin::ScreenDrawerWin() |
| : ScreenDrawer(), |
| rect_(GetScreenRect()), |
| window_(CreateDrawerWindow(rect_)), |
| hdc_(GetWindowDC(window_)) { |
| // We do not need to handle any messages for the |window_|, so disable Windows |
| // process windows ghosting feature. |
| DisableProcessWindowsGhosting(); |
| } |
| |
| ScreenDrawerWin::~ScreenDrawerWin() { |
| ReleaseDC(NULL, hdc_); |
| DestroyWindow(window_); |
| // Unfortunately there is no EnableProcessWindowsGhosting() API. |
| } |
| |
| DesktopRect ScreenDrawerWin::DrawableRegion() { |
| return rect_; |
| } |
| |
| void ScreenDrawerWin::DrawRectangle(DesktopRect rect, uint32_t rgba) { |
| int r = (rgba & 0xff00) >> 8; |
| int g = (rgba & 0xff0000) >> 16; |
| int b = (rgba & 0xff000000) >> 24; |
| // Windows device context does not support Alpha. |
| SelectObject(hdc_, GetStockObject(DC_PEN)); |
| SelectObject(hdc_, GetStockObject(DC_BRUSH)); |
| SetDCBrushColor(hdc_, RGB(r, g, b)); |
| SetDCPenColor(hdc_, RGB(r, g, b)); |
| Rectangle(hdc_, rect.left(), rect.top(), rect.right(), rect.bottom()); |
| } |
| |
| void ScreenDrawerWin::Clear() { |
| DrawRectangle(DrawableRegion(), 0); |
| } |
| |
| } // namespace |
| |
| // static |
| std::unique_ptr<ScreenDrawer> ScreenDrawer::Create() { |
| return std::unique_ptr<ScreenDrawer>(new ScreenDrawerWin()); |
| } |
| |
| } // namespace webrtc |