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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2001-2002 NaN Holding BV. All rights reserved. */
/** \file
* \ingroup GHOST
*/
#include "GHOST_DisplayManagerWin32.h"
#include "GHOST_Debug.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
/* We do not support multiple monitors at the moment. */
#define COMPILE_MULTIMON_STUBS
#include <multimon.h>
GHOST_DisplayManagerWin32::GHOST_DisplayManagerWin32(void)
{
}
GHOST_TSuccess GHOST_DisplayManagerWin32::getNumDisplays(uint8_t &numDisplays) const
{
numDisplays = ::GetSystemMetrics(SM_CMONITORS);
return numDisplays > 0 ? GHOST_kSuccess : GHOST_kFailure;
}
static BOOL get_dd(DWORD d, DISPLAY_DEVICE *dd)
{
dd->cb = sizeof(DISPLAY_DEVICE);
return ::EnumDisplayDevices(NULL, d, dd, 0);
}
GHOST_TSuccess GHOST_DisplayManagerWin32::getNumDisplaySettings(uint8_t display,
int32_t &numSettings) const
{
/* When you call #EnumDisplaySettings with #iModeNum set to zero, the operating system
* initializes and caches information about the display device.
* When you call #EnumDisplaySettings with #iModeNum set to a non-zero value,
* the function returns the information that was cached the last time the
* function was called with #iModeNum set to zero. */
DISPLAY_DEVICE display_device;
if (!get_dd(display, &display_device))
return GHOST_kFailure;
numSettings = 0;
DEVMODE dm;
while (::EnumDisplaySettings(display_device.DeviceName, numSettings, &dm)) {
numSettings++;
}
return GHOST_kSuccess;
}
GHOST_TSuccess GHOST_DisplayManagerWin32::getDisplaySetting(uint8_t display,
int32_t index,
GHOST_DisplaySetting &setting) const
{
DISPLAY_DEVICE display_device;
if (!get_dd(display, &display_device))
return GHOST_kFailure;
GHOST_TSuccess success;
DEVMODE dm;
if (::EnumDisplaySettings(display_device.DeviceName, index, &dm)) {
#ifdef WITH_GHOST_DEBUG
printf("display mode: width=%d, height=%d, bpp=%d, frequency=%d\n",
dm.dmPelsWidth,
dm.dmPelsHeight,
dm.dmBitsPerPel,
dm.dmDisplayFrequency);
#endif /* WITH_GHOST_DEBUG */
setting.xPixels = dm.dmPelsWidth;
setting.yPixels = dm.dmPelsHeight;
setting.bpp = dm.dmBitsPerPel;
/* When you call the #EnumDisplaySettings function, the #dmDisplayFrequency member
* may return with the value 0 or 1. These values represent the display hardware's
* default refresh rate. This default rate is typically set by switches on a display
* card or computer motherboard, or by a configuration program that does not use
* Win32 display functions such as #ChangeDisplaySettings. */
/* First, we tried to explicitly set the frequency to 60 if #EnumDisplaySettings
* returned 0 or 1 but this doesn't work since later on an exact match will
* be searched. And this will never happen if we change it to 60. Now we rely
* on the default hardware setting. */
setting.frequency = dm.dmDisplayFrequency;
success = GHOST_kSuccess;
}
else {
success = GHOST_kFailure;
}
return success;
}
GHOST_TSuccess GHOST_DisplayManagerWin32::getCurrentDisplaySetting(
uint8_t display, GHOST_DisplaySetting &setting) const
{
return getDisplaySetting(display, ENUM_CURRENT_SETTINGS, setting);
}
GHOST_TSuccess GHOST_DisplayManagerWin32::setCurrentDisplaySetting(
uint8_t display, const GHOST_DisplaySetting &setting)
{
DISPLAY_DEVICE display_device;
if (!get_dd(display, &display_device))
return GHOST_kFailure;
GHOST_DisplaySetting match;
findMatch(display, setting, match);
DEVMODE dm;
int i = 0;
while (::EnumDisplaySettings(display_device.DeviceName, i++, &dm)) {
if ((dm.dmBitsPerPel == match.bpp) && (dm.dmPelsWidth == match.xPixels) &&
(dm.dmPelsHeight == match.yPixels) && (dm.dmDisplayFrequency == match.frequency)) {
break;
}
}
#if 0
dm.dmBitsPerPel = match.bpp;
dm.dmPelsWidth = match.xPixels;
dm.dmPelsHeight = match.yPixels;
dm.dmDisplayFrequency = match.frequency;
dm.dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT | DM_DISPLAYFREQUENCY;
dm.dmSize = sizeof(DEVMODE);
dm.dmDriverExtra = 0;
#endif
#ifdef WITH_GHOST_DEBUG
printf("display change: Requested settings:\n");
printf(" dmBitsPerPel=%d\n", dm.dmBitsPerPel);
printf(" dmPelsWidth=%d\n", dm.dmPelsWidth);
printf(" dmPelsHeight=%d\n", dm.dmPelsHeight);
printf(" dmDisplayFrequency=%d\n", dm.dmDisplayFrequency);
#endif /* WITH_GHOST_DEBUG */
LONG status = ::ChangeDisplaySettings(&dm, CDS_FULLSCREEN);
#ifdef WITH_GHOST_DEBUG
switch (status) {
case DISP_CHANGE_SUCCESSFUL:
printf("display change: The settings change was successful.\n");
break;
case DISP_CHANGE_RESTART:
printf(
"display change: The computer must be restarted in order for the graphics mode to "
"work.\n");
break;
case DISP_CHANGE_BADFLAGS:
printf("display change: An invalid set of flags was passed in.\n");
break;
case DISP_CHANGE_BADPARAM:
printf(
"display change: An invalid parameter was passed in. "
"This can include an invalid flag or combination of flags.\n");
break;
case DISP_CHANGE_FAILED:
printf("display change: The display driver failed the specified graphics mode.\n");
break;
case DISP_CHANGE_BADMODE:
printf("display change: The graphics mode is not supported.\n");
break;
case DISP_CHANGE_NOTUPDATED:
printf("display change: Windows NT: Unable to write settings to the registry.\n");
break;
default:
printf("display change: Return value invalid\n");
break;
}
#endif /* WITH_GHOST_DEBUG */
return status == DISP_CHANGE_SUCCESSFUL ? GHOST_kSuccess : GHOST_kFailure;
}
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