src/win32_monitor.c

//========================================================================
// GLFW - An OpenGL library
// Platform:    X11 (Unix)
// API version: 3.0
// WWW:         http://www.glfw.org/
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would
//    be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
//    be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
//    distribution.
//
//========================================================================

#include "internal.h"

#include <stdlib.h>
#include <string.h>

// The MinGW package for Debian lacks this
#ifndef EDS_ROTATEDMODE
#define EDS_ROTATEDMODE 0x00000004
#endif

// The MinGW upstream lacks this
#ifndef DISPLAY_DEVICE_ACTIVE
#define DISPLAY_DEVICE_ACTIVE 0x00000001
#endif


//////////////////////////////////////////////////////////////////////////
//////                       GLFW platform API                      //////
//////////////////////////////////////////////////////////////////////////

//========================================================================
// Create a monitor struct from the specified information
//========================================================================

_GLFWmonitor** _glfwCreateMonitor(_GLFWmonitor** current,
                                  DISPLAY_DEVICE* adapter,
                                  DISPLAY_DEVICE* monitor,
                                  DEVMODE* setting)
{
    HDC dc = NULL;

    *current = malloc(sizeof(_GLFWmonitor));
    memset(*current, 0, sizeof(_GLFWmonitor));

    dc = CreateDC(L"DISPLAY", monitor->DeviceString, NULL, NULL);

    (*current)->physicalWidth  = GetDeviceCaps(dc, HORZSIZE);
    (*current)->physicalHeight = GetDeviceCaps(dc, VERTSIZE);

    DeleteDC(dc);

    (*current)->name = _glfwCreateUTF8FromWideString(monitor->DeviceName);

    (*current)->screenX = setting->dmPosition.x;
    (*current)->screenY = setting->dmPosition.y;

    (*current)->Win32.name = _glfwCreateUTF8FromWideString(adapter->DeviceName);

    return &((*current)->next);
}


//========================================================================
// Destroy a monitor struct
//========================================================================

_GLFWmonitor* _glfwDestroyMonitor(_GLFWmonitor* monitor)
{
    _GLFWmonitor* result;

    result = monitor->next;

    free(monitor->Win32.name);
    free(monitor->name);
    free(monitor);

    return result;
}


//========================================================================
// Return a list of available monitors
//========================================================================

_GLFWmonitor* _glfwCreateMonitors(void)
{
    DISPLAY_DEVICE adapter;
    DWORD adapterNum;
    DISPLAY_DEVICE monitor;
    DEVMODE setting;
    _GLFWmonitor* monitorList;
    _GLFWmonitor** curMonitor;

    adapter.cb = sizeof(DISPLAY_DEVICE);
    adapterNum = 0;
    monitor.cb = sizeof(DISPLAY_DEVICE);
    setting.dmSize = sizeof(DEVMODE);
    monitorList = NULL;
    curMonitor = &monitorList;

    while (EnumDisplayDevices(NULL, adapterNum++, &adapter, 0))
    {
        if (adapter.StateFlags & DISPLAY_DEVICE_MIRRORING_DRIVER || !(adapter.StateFlags & DISPLAY_DEVICE_ACTIVE))
            continue;

        EnumDisplaySettingsEx(adapter.DeviceName,
                              ENUM_CURRENT_SETTINGS,
                              &setting,
                              EDS_ROTATEDMODE);

        EnumDisplayDevices(adapter.DeviceName, 0, &monitor, 0);

        curMonitor = _glfwCreateMonitor(curMonitor, &adapter, &monitor, &setting);
    }

    return monitorList;
}