#include "Display.h"
#include "Exception.h"


Display::Display()
{
    _devmode.dmSize = sizeof(DEVMODE);

    BOOL success = EnumDisplaySettingsEx(
        nullptr,
        ENUM_CURRENT_SETTINGS,
        &_devmode,
        0
    );

    if (!success)
        throw SystemException(GetLastError());
}


void Display::rotate(Rotation rot)
{
    DWORD& orient = _devmode.dmDisplayOrientation;
    DWORD& width = _devmode.dmPelsWidth;
    DWORD& height = _devmode.dmPelsHeight;

    if (orient == DMDO_90 || orient == DMDO_270)
        std::swap(width, height);

    orient = (DWORD)rot;

    if (orient == DMDO_90 || orient == DMDO_270)
        std::swap(width, height);
}


void Display::apply()
{
    LONG res = ChangeDisplaySettingsEx(nullptr, &_devmode, nullptr, CDS_RESET, nullptr);

    if (res != DISP_CHANGE_SUCCESSFUL)
        throw DisplayException(res);
}