| /* |
| * 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 <memory> |
| |
| #include "webrtc/base/checks.h" |
| #include "webrtc/modules/desktop_capture/screen_drawer.h" |
| #include "webrtc/modules/desktop_capture/x11/shared_x_display.h" |
| |
| namespace webrtc { |
| |
| namespace { |
| |
| // A ScreenDrawer implementation for X11. |
| class ScreenDrawerLinux : public ScreenDrawer { |
| public: |
| ScreenDrawerLinux(); |
| ~ScreenDrawerLinux() override; |
| |
| // ScreenDrawer interface. |
| DesktopRect DrawableRegion() override; |
| void DrawRectangle(DesktopRect rect, uint32_t rgba) override; |
| void Clear() override; |
| |
| private: |
| rtc::scoped_refptr<SharedXDisplay> display_; |
| Screen* screen_; |
| int screen_num_; |
| DesktopRect rect_; |
| Window window_; |
| GC context_; |
| Colormap colormap_; |
| }; |
| |
| ScreenDrawerLinux::ScreenDrawerLinux() { |
| display_ = SharedXDisplay::CreateDefault(); |
| RTC_CHECK(display_.get()); |
| screen_ = DefaultScreenOfDisplay(display_->display()); |
| RTC_CHECK(screen_); |
| screen_num_ = DefaultScreen(display_->display()); |
| rect_ = DesktopRect::MakeWH(screen_->width, screen_->height); |
| window_ = XCreateSimpleWindow(display_->display(), |
| RootWindow(display_->display(), screen_num_), 0, |
| 0, rect_.width(), rect_.height(), 0, |
| BlackPixel(display_->display(), screen_num_), |
| BlackPixel(display_->display(), screen_num_)); |
| XSelectInput(display_->display(), window_, StructureNotifyMask); |
| XMapWindow(display_->display(), window_); |
| while (true) { |
| XEvent event; |
| XNextEvent(display_->display(), &event); |
| if (event.type == MapNotify) { |
| break; |
| } |
| } |
| XFlush(display_->display()); |
| context_ = DefaultGC(display_->display(), screen_num_); |
| colormap_ = DefaultColormap(display_->display(), screen_num_); |
| } |
| |
| ScreenDrawerLinux::~ScreenDrawerLinux() { |
| XUnmapWindow(display_->display(), window_); |
| XDestroyWindow(display_->display(), window_); |
| } |
| |
| DesktopRect ScreenDrawerLinux::DrawableRegion() { |
| return rect_; |
| } |
| |
| void ScreenDrawerLinux::DrawRectangle(DesktopRect rect, uint32_t rgba) { |
| int r = (rgba & 0xff00) >> 8; |
| int g = (rgba & 0xff0000) >> 16; |
| int b = (rgba & 0xff000000) >> 24; |
| // X11 does not support Alpha. |
| XColor color; |
| // X11 uses 16 bits for each primary color. |
| color.red = r * 256; |
| color.green = g * 256; |
| color.blue = b * 256; |
| color.flags = DoRed | DoGreen | DoBlue; |
| XAllocColor(display_->display(), colormap_, &color); |
| XSetForeground(display_->display(), context_, color.pixel); |
| XFillRectangle(display_->display(), window_, context_, rect.left(), |
| rect.top(), rect.width(), rect.height()); |
| XFlush(display_->display()); |
| } |
| |
| void ScreenDrawerLinux::Clear() { |
| DrawRectangle(DrawableRegion(), 0); |
| } |
| |
| } // namespace |
| |
| // static |
| std::unique_ptr<ScreenDrawer> ScreenDrawer::Create() { |
| return std::unique_ptr<ScreenDrawer>(new ScreenDrawerLinux()); |
| } |
| |
| } // namespace webrtc |