A tiling window manager for streaming / recording video on 3440x1440 screen with 2560x1440 capture area in the center.

Resize.cpp

#include <iostream>
#include <string>
#include <Windows.h>
#include <WinUser.h>
#include <TlHelp32.h>

void ResizeActiveWindow(float hScale, float vScale, int newX, int newY) {
    HWND activeWindow = GetForegroundWindow();
    if (activeWindow) {
        // Get the handle to the monitor where the window is currently located
        HMONITOR hMonitor = MonitorFromWindow(activeWindow, MONITOR_DEFAULTTONEAREST);

        // Get the information about the monitor
        MONITORINFO mi = { sizeof(MONITORINFO) };
        GetMonitorInfo(hMonitor, &mi);

        DWORD activeWindowProcessId;
        GetWindowThreadProcessId(activeWindow, &activeWindowProcessId);

        int newWidth = static_cast<int>(2560 * hScale);
        int newHeight = static_cast<int>(1440 * vScale);
        // Calculate the new position and size of the window
        //int newWidth = static_cast<int>((mi.rcMonitor.right - mi.rcMonitor.left) * hScale);
        //int newHeight = static_cast<int>((mi.rcMonitor.bottom - mi.rcMonitor.top) * vScale);
        newX += mi.rcMonitor.left;
        newY += mi.rcMonitor.top;

        UINT flags = SWP_FRAMECHANGED | SWP_NOZORDER | SWP_NOOWNERZORDER;
        ShowWindow(activeWindow, SW_RESTORE);
        SetWindowPos(activeWindow, NULL, newX, newY, newWidth, newHeight, flags);
    }
}

void ToggleActiveWindow() {
    HWND activeWindow = GetForegroundWindow();
    if (activeWindow) {
        WINDOWPLACEMENT wp;
        wp.length = sizeof(WINDOWPLACEMENT);
        GetWindowPlacement(activeWindow, &wp);
        if (wp.showCmd == SW_SHOWMAXIMIZED) {
            ShowWindow(activeWindow, SW_RESTORE);
        } else {
            ShowWindow(activeWindow, SW_MAXIMIZE);
        }
    }
}


LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam) {
    if (nCode == HC_ACTION) {
        KBDLLHOOKSTRUCT *pKeyboard = (KBDLLHOOKSTRUCT *)lParam;

        if (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN) {
            if (pKeyboard->vkCode == VK_DELETE && GetAsyncKeyState(VK_SHIFT) & 0x8000 && GetAsyncKeyState(VK_MENU) & 0x8000) {
                PostQuitMessage(0);
            } else if (pKeyboard->vkCode == 'M' && GetAsyncKeyState(VK_SHIFT) & 0x8000 && GetAsyncKeyState(VK_MENU) & 0x8000) {
                int centerX = (3440 - 2560) / 2;
                int centerY = (1440 - 1440) / 2;
                ResizeActiveWindow(1.0f, 1.0f, centerX, centerY);
            } else if ((pKeyboard->vkCode >= VK_NUMPAD0 && pKeyboard->vkCode <= VK_NUMPAD9) && /*GetAsyncKeyState(VK_SHIFT) & 0x8000 &&*/ GetAsyncKeyState(VK_CONTROL) & 0x8000) {
                int centerX = (3440 - 2560) / 2;
                int centerY = (1440 - 1440) / 2;
                switch (pKeyboard->vkCode) {
                    case VK_NUMPAD0:
                        ToggleActiveWindow();
                        break;
                    case VK_NUMPAD1:
                        ResizeActiveWindow(0.5f, 0.5f, centerX, centerY + 720);
                        break;
                    case VK_NUMPAD2:
                        ResizeActiveWindow(1.0f, 0.5f, centerX, centerY + 720);
                        break;
                    case VK_NUMPAD3:
                        ResizeActiveWindow(0.5f, 0.5f, centerX + 1280, centerY + 720);
                        break;
                    case VK_NUMPAD4:
                        ResizeActiveWindow(0.5f, 1.0f, centerX, centerY);
                        break;
                    case VK_NUMPAD5:
                        ResizeActiveWindow(1.0f, 1.0f, centerX, centerY);
                        break;
                    case VK_NUMPAD6:
                        ResizeActiveWindow(0.5f, 1.0f, centerX + 1280, centerY);
                        break;
                    case VK_NUMPAD7:
                        ResizeActiveWindow(0.5f, 0.5f, centerX, centerY);
                        break;
                    case VK_NUMPAD8:
                        ResizeActiveWindow(1.0f, 0.5f, centerX, centerY);
                        break;
                    case VK_NUMPAD9:
                        ResizeActiveWindow(0.5f, 0.5f, centerX + 1280, centerY);
                        break;
                    default:
                        break;
                }
            }
        }
    }
    return CallNextHookEx(NULL, nCode, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
    FreeConsole();
    HHOOK keyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, LowLevelKeyboardProc, hInstance, 0);

    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    UnhookWindowsHookEx(keyboardHook);

    return (int)msg.wParam;
}