mirror of
https://github.com/gnif/LookingGlass.git
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141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
/**
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* Looking Glass
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* Copyright © 2017-2023 The Looking Glass Authors
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* https://looking-glass.io
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "windows/force_compose.h"
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#include "common/windebug.h"
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#include <windows.h>
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#include <stdbool.h>
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struct ForceCompose
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{
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HANDLE event;
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HANDLE thread;
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};
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static struct ForceCompose forceCompose = { 0 };
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LRESULT CALLBACK windowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
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{
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switch (message)
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{
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case WM_CLOSE:
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return 0; // Don't allow close
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case WM_DESTROY:
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PostQuitMessage(0);
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return 0;
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case WM_PAINT:
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{
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PAINTSTRUCT ps;
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HDC hdc = BeginPaint(hwnd, &ps);
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FillRect(hdc, &ps.rcPaint, (HBRUSH) (COLOR_WINDOW+1));
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EndPaint(hwnd, &ps);
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return 0;
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}
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}
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return DefWindowProc(hwnd, message, wParam, lParam);
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}
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static DWORD WINAPI threadProc(LPVOID lParam)
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{
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WNDCLASSA wc = { 0 };
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wc.lpfnWndProc = windowProc;
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wc.hInstance = (HINSTANCE) GetModuleHandle(NULL);
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wc.lpszClassName = "looking-glass-force-composition";
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RegisterClass(&wc);
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HWND hwnd = CreateWindowEx(
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WS_EX_TOOLWINDOW | WS_EX_TOPMOST | WS_EX_LAYERED, wc.lpszClassName,
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"Looking Glass Helper Window", WS_POPUP, 0, 0, 1, 1, NULL, NULL,
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wc.hInstance, NULL
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);
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if (!hwnd)
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{
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DEBUG_ERROR("Failed to create window to force composition");
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goto exit;
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}
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SetLayeredWindowAttributes(hwnd, GetSysColor(COLOR_WINDOW), 0, LWA_COLORKEY);
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ShowWindow(hwnd, SW_SHOW);
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DEBUG_INFO("Created window to force composition");
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MSG msg;
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while (true)
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{
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switch (MsgWaitForMultipleObjects(1, &forceCompose.event, FALSE, INFINITE, QS_ALLINPUT))
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{
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case WAIT_OBJECT_0:
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DEBUG_INFO("Force composition received quit request");
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DestroyWindow(hwnd);
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// Do not wait on the event after it has been signaled.
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while (GetMessage(&msg, NULL, 0, 0) > 0)
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{
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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}
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goto exit;
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case WAIT_OBJECT_0 + 1:
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while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
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{
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if (msg.message == WM_QUIT)
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goto exit;
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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}
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break;
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default:
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DEBUG_WINERROR("MsgWaitForMultipleObjects failed", GetLastError());
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goto exit;
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}
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}
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exit:
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UnregisterClass(wc.lpszClassName, wc.hInstance);
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return 0;
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}
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void dwmForceComposition(void)
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{
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if (!forceCompose.event)
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{
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forceCompose.event = CreateEventA(NULL, FALSE, FALSE, NULL);
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if (!forceCompose.event)
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{
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DEBUG_WINERROR("Failed to create unforce composition event", GetLastError());
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return;
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}
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}
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forceCompose.thread = CreateThread(NULL, 0, threadProc, NULL, 0, NULL);
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}
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void dwmUnforceComposition(void)
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{
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if (!forceCompose.event)
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return;
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SetEvent(forceCompose.event);
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WaitForSingleObject(forceCompose.thread, INFINITE);
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CloseHandle(forceCompose.thread);
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forceCompose.thread = NULL;
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}
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