49c01d7f34
implementation can accurately capture updated regions. Especially in ScreenCapturerWinDirectx, which has a specific updated region spreading logic and cannot be tested through regular code path. So we need a controllable ScreenDrawer to draw some basic shapes on the screen. And a platform independent test case can use the ScreenDrawer to test a ScreenCapturer. So this change addes a ScreenDrawer virtual class, and its Windows implementation ScreenDrawerWin. A disabled gtest ScreenDrawerTest.DrawRectangles is also added to manually test whether ScreenDrawer can work on a certain platform. BUG=314516 TBR=kjellander@webrtc.org Review-Url: https://codereview.webrtc.org/2210443002 Cr-Commit-Position: refs/heads/master@{#13788}
98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
/*
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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <windows.h>
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#include <memory>
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#include "webrtc/modules/desktop_capture/screen_drawer.h"
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namespace webrtc {
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namespace {
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DesktopRect GetScreenRect() {
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HDC hdc = GetDC(NULL);
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DesktopRect rect = DesktopRect::MakeWH(GetDeviceCaps(hdc, HORZRES),
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GetDeviceCaps(hdc, VERTRES));
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ReleaseDC(NULL, hdc);
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return rect;
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}
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HWND CreateDrawerWindow(DesktopRect rect) {
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HWND hwnd = CreateWindowA(
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"STATIC", "DrawerWindow", WS_POPUPWINDOW | WS_VISIBLE, rect.left(),
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rect.top(), rect.width(), rect.height(), NULL, NULL, NULL, NULL);
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SetForegroundWindow(hwnd);
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return hwnd;
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}
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// A ScreenDrawer implementation for Windows.
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class ScreenDrawerWin : public ScreenDrawer {
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public:
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ScreenDrawerWin();
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~ScreenDrawerWin() override;
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// ScreenDrawer interface.
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DesktopRect DrawableRegion() override;
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void DrawRectangle(DesktopRect rect, uint32_t rgba) override;
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void Clear() override;
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private:
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const DesktopRect rect_;
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HWND window_;
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HDC hdc_;
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};
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ScreenDrawerWin::ScreenDrawerWin()
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: ScreenDrawer(),
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rect_(GetScreenRect()),
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window_(CreateDrawerWindow(rect_)),
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hdc_(GetWindowDC(window_)) {
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// We do not need to handle any messages for the |window_|, so disable Windows
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// process windows ghosting feature.
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DisableProcessWindowsGhosting();
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}
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ScreenDrawerWin::~ScreenDrawerWin() {
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ReleaseDC(NULL, hdc_);
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DestroyWindow(window_);
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// Unfortunately there is no EnableProcessWindowsGhosting() API.
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}
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DesktopRect ScreenDrawerWin::DrawableRegion() {
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return rect_;
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}
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void ScreenDrawerWin::DrawRectangle(DesktopRect rect, uint32_t rgba) {
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int r = (rgba & 0xff00) >> 8;
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int g = (rgba & 0xff0000) >> 16;
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int b = (rgba & 0xff000000) >> 24;
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// Windows device context does not support Alpha.
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SelectObject(hdc_, GetStockObject(DC_PEN));
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SelectObject(hdc_, GetStockObject(DC_BRUSH));
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SetDCBrushColor(hdc_, RGB(r, g, b));
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SetDCPenColor(hdc_, RGB(r, g, b));
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Rectangle(hdc_, rect.left(), rect.top(), rect.right(), rect.bottom());
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}
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void ScreenDrawerWin::Clear() {
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DrawRectangle(DrawableRegion(), 0);
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}
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} // namespace
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// static
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std::unique_ptr<ScreenDrawer> ScreenDrawer::Create() {
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return std::unique_ptr<ScreenDrawer>(new ScreenDrawerWin());
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}
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} // namespace webrtc
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