ref: 12b7990cf9e2a448fe7d54c4f21b85483c9cf8c2
dir: /external/glfw/src/win32_monitor.c/
//========================================================================
// GLFW 3.3 Win32 - www.glfw.org
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2019 Camilla Löwy <elmindreda@glfw.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.
//
//========================================================================
// Please use C89 style variable declarations in this file because VS 2010
//========================================================================
#include "internal.h"
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <malloc.h>
#include <wchar.h>
// Callback for EnumDisplayMonitors in createMonitor
//
static BOOL CALLBACK monitorCallback(HMONITOR handle,
HDC dc,
RECT* rect,
LPARAM data)
{
MONITORINFOEXW mi;
ZeroMemory(&mi, sizeof(mi));
mi.cbSize = sizeof(mi);
if (GetMonitorInfoW(handle, (MONITORINFO*) &mi))
{
_GLFWmonitor* monitor = (_GLFWmonitor*) data;
if (wcscmp(mi.szDevice, monitor->win32.adapterName) == 0)
monitor->win32.handle = handle;
}
return TRUE;
}
// Create monitor from an adapter and (optionally) a display
//
static _GLFWmonitor* createMonitor(DISPLAY_DEVICEW* adapter,
DISPLAY_DEVICEW* display)
{
_GLFWmonitor* monitor;
int widthMM, heightMM;
char* name;
HDC dc;
DEVMODEW dm;
RECT rect;
if (display)
name = _glfwCreateUTF8FromWideStringWin32(display->DeviceString);
else
name = _glfwCreateUTF8FromWideStringWin32(adapter->DeviceString);
if (!name)
return NULL;
ZeroMemory(&dm, sizeof(dm));
dm.dmSize = sizeof(dm);
EnumDisplaySettingsW(adapter->DeviceName, ENUM_CURRENT_SETTINGS, &dm);
dc = CreateDCW(L"DISPLAY", adapter->DeviceName, NULL, NULL);
if (IsWindows8Point1OrGreater())
{
widthMM = GetDeviceCaps(dc, HORZSIZE);
heightMM = GetDeviceCaps(dc, VERTSIZE);
}
else
{
widthMM = (int) (dm.dmPelsWidth * 25.4f / GetDeviceCaps(dc, LOGPIXELSX));
heightMM = (int) (dm.dmPelsHeight * 25.4f / GetDeviceCaps(dc, LOGPIXELSY));
}
DeleteDC(dc);
monitor = _glfwAllocMonitor(name, widthMM, heightMM);
free(name);
if (adapter->StateFlags & DISPLAY_DEVICE_MODESPRUNED)
monitor->win32.modesPruned = GLFW_TRUE;
wcscpy(monitor->win32.adapterName, adapter->DeviceName);
WideCharToMultiByte(CP_UTF8, 0,
adapter->DeviceName, -1,
monitor->win32.publicAdapterName,
sizeof(monitor->win32.publicAdapterName),
NULL, NULL);
if (display)
{
wcscpy(monitor->win32.displayName, display->DeviceName);
WideCharToMultiByte(CP_UTF8, 0,
display->DeviceName, -1,
monitor->win32.publicDisplayName,
sizeof(monitor->win32.publicDisplayName),
NULL, NULL);
}
rect.left = dm.dmPosition.x;
rect.top = dm.dmPosition.y;
rect.right = dm.dmPosition.x + dm.dmPelsWidth;
rect.bottom = dm.dmPosition.y + dm.dmPelsHeight;
EnumDisplayMonitors(NULL, &rect, monitorCallback, (LPARAM) monitor);
return monitor;
}
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
// Poll for changes in the set of connected monitors
//
void _glfwPollMonitorsWin32(void)
{
int i, disconnectedCount;
_GLFWmonitor** disconnected = NULL;
DWORD adapterIndex, displayIndex;
DISPLAY_DEVICEW adapter, display;
_GLFWmonitor* monitor;
disconnectedCount = _glfw.monitorCount;
if (disconnectedCount)
{
disconnected = calloc(_glfw.monitorCount, sizeof(_GLFWmonitor*));
memcpy(disconnected,
_glfw.monitors,
_glfw.monitorCount * sizeof(_GLFWmonitor*));
}
for (adapterIndex = 0; ; adapterIndex++)
{
int type = _GLFW_INSERT_LAST;
ZeroMemory(&adapter, sizeof(adapter));
adapter.cb = sizeof(adapter);
if (!EnumDisplayDevicesW(NULL, adapterIndex, &adapter, 0))
break;
if (!(adapter.StateFlags & DISPLAY_DEVICE_ACTIVE))
continue;
if (adapter.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE)
type = _GLFW_INSERT_FIRST;
for (displayIndex = 0; ; displayIndex++)
{
ZeroMemory(&display, sizeof(display));
display.cb = sizeof(display);
if (!EnumDisplayDevicesW(adapter.DeviceName, displayIndex, &display, 0))
break;
if (!(display.StateFlags & DISPLAY_DEVICE_ACTIVE))
continue;
for (i = 0; i < disconnectedCount; i++)
{
if (disconnected[i] &&
wcscmp(disconnected[i]->win32.displayName,
display.DeviceName) == 0)
{
disconnected[i] = NULL;
break;
}
}
if (i < disconnectedCount)
continue;
monitor = createMonitor(&adapter, &display);
if (!monitor)
{
free(disconnected);
return;
}
_glfwInputMonitor(monitor, GLFW_CONNECTED, type);
type = _GLFW_INSERT_LAST;
}
// HACK: If an active adapter does not have any display devices
// (as sometimes happens), add it directly as a monitor
if (displayIndex == 0)
{
for (i = 0; i < disconnectedCount; i++)
{
if (disconnected[i] &&
wcscmp(disconnected[i]->win32.adapterName,
adapter.DeviceName) == 0)
{
disconnected[i] = NULL;
break;
}
}
if (i < disconnectedCount)
continue;
monitor = createMonitor(&adapter, NULL);
if (!monitor)
{
free(disconnected);
return;
}
_glfwInputMonitor(monitor, GLFW_CONNECTED, type);
}
}
for (i = 0; i < disconnectedCount; i++)
{
if (disconnected[i])
_glfwInputMonitor(disconnected[i], GLFW_DISCONNECTED, 0);
}
free(disconnected);
}
// Change the current video mode
//
void _glfwSetVideoModeWin32(_GLFWmonitor* monitor, const GLFWvidmode* desired)
{
GLFWvidmode current;
const GLFWvidmode* best;
DEVMODEW dm;
LONG result;
best = _glfwChooseVideoMode(monitor, desired);
_glfwPlatformGetVideoMode(monitor, ¤t);
if (_glfwCompareVideoModes(¤t, best) == 0)
return;
ZeroMemory(&dm, sizeof(dm));
dm.dmSize = sizeof(dm);
dm.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL |
DM_DISPLAYFREQUENCY;
dm.dmPelsWidth = best->width;
dm.dmPelsHeight = best->height;
dm.dmBitsPerPel = best->redBits + best->greenBits + best->blueBits;
dm.dmDisplayFrequency = best->refreshRate;
if (dm.dmBitsPerPel < 15 || dm.dmBitsPerPel >= 24)
dm.dmBitsPerPel = 32;
result = ChangeDisplaySettingsExW(monitor->win32.adapterName,
&dm,
NULL,
CDS_FULLSCREEN,
NULL);
if (result == DISP_CHANGE_SUCCESSFUL)
monitor->win32.modeChanged = GLFW_TRUE;
else
{
const char* description = "Unknown error";
if (result == DISP_CHANGE_BADDUALVIEW)
description = "The system uses DualView";
else if (result == DISP_CHANGE_BADFLAGS)
description = "Invalid flags";
else if (result == DISP_CHANGE_BADMODE)
description = "Graphics mode not supported";
else if (result == DISP_CHANGE_BADPARAM)
description = "Invalid parameter";
else if (result == DISP_CHANGE_FAILED)
description = "Graphics mode failed";
else if (result == DISP_CHANGE_NOTUPDATED)
description = "Failed to write to registry";
else if (result == DISP_CHANGE_RESTART)
description = "Computer restart required";
_glfwInputError(GLFW_PLATFORM_ERROR,
"Win32: Failed to set video mode: %s",
description);
}
}
// Restore the previously saved (original) video mode
//
void _glfwRestoreVideoModeWin32(_GLFWmonitor* monitor)
{
if (monitor->win32.modeChanged)
{
ChangeDisplaySettingsExW(monitor->win32.adapterName,
NULL, NULL, CDS_FULLSCREEN, NULL);
monitor->win32.modeChanged = GLFW_FALSE;
}
}
void _glfwGetMonitorContentScaleWin32(HMONITOR handle, float* xscale, float* yscale)
{
UINT xdpi, ydpi;
if (IsWindows8Point1OrGreater())
GetDpiForMonitor(handle, MDT_EFFECTIVE_DPI, &xdpi, &ydpi);
else
{
const HDC dc = GetDC(NULL);
xdpi = GetDeviceCaps(dc, LOGPIXELSX);
ydpi = GetDeviceCaps(dc, LOGPIXELSY);
ReleaseDC(NULL, dc);
}
if (xscale)
*xscale = xdpi / (float) USER_DEFAULT_SCREEN_DPI;
if (yscale)
*yscale = ydpi / (float) USER_DEFAULT_SCREEN_DPI;
}
//////////////////////////////////////////////////////////////////////////
////// GLFW platform API //////
//////////////////////////////////////////////////////////////////////////
void _glfwPlatformFreeMonitor(_GLFWmonitor* monitor)
{
}
void _glfwPlatformGetMonitorPos(_GLFWmonitor* monitor, int* xpos, int* ypos)
{
DEVMODEW dm;
ZeroMemory(&dm, sizeof(dm));
dm.dmSize = sizeof(dm);
EnumDisplaySettingsExW(monitor->win32.adapterName,
ENUM_CURRENT_SETTINGS,
&dm,
EDS_ROTATEDMODE);
if (xpos)
*xpos = dm.dmPosition.x;
if (ypos)
*ypos = dm.dmPosition.y;
}
void _glfwPlatformGetMonitorContentScale(_GLFWmonitor* monitor,
float* xscale, float* yscale)
{
_glfwGetMonitorContentScaleWin32(monitor->win32.handle, xscale, yscale);
}
void _glfwPlatformGetMonitorWorkarea(_GLFWmonitor* monitor,
int* xpos, int* ypos,
int* width, int* height)
{
MONITORINFO mi = { sizeof(mi) };
GetMonitorInfo(monitor->win32.handle, &mi);
if (xpos)
*xpos = mi.rcWork.left;
if (ypos)
*ypos = mi.rcWork.top;
if (width)
*width = mi.rcWork.right - mi.rcWork.left;
if (height)
*height = mi.rcWork.bottom - mi.rcWork.top;
}
GLFWvidmode* _glfwPlatformGetVideoModes(_GLFWmonitor* monitor, int* count)
{
int modeIndex = 0, size = 0;
GLFWvidmode* result = NULL;
*count = 0;
for (;;)
{
int i;
GLFWvidmode mode;
DEVMODEW dm;
ZeroMemory(&dm, sizeof(dm));
dm.dmSize = sizeof(dm);
if (!EnumDisplaySettingsW(monitor->win32.adapterName, modeIndex, &dm))
break;
modeIndex++;
// Skip modes with less than 15 BPP
if (dm.dmBitsPerPel < 15)
continue;
mode.width = dm.dmPelsWidth;
mode.height = dm.dmPelsHeight;
mode.refreshRate = dm.dmDisplayFrequency;
_glfwSplitBPP(dm.dmBitsPerPel,
&mode.redBits,
&mode.greenBits,
&mode.blueBits);
for (i = 0; i < *count; i++)
{
if (_glfwCompareVideoModes(result + i, &mode) == 0)
break;
}
// Skip duplicate modes
if (i < *count)
continue;
if (monitor->win32.modesPruned)
{
// Skip modes not supported by the connected displays
if (ChangeDisplaySettingsExW(monitor->win32.adapterName,
&dm,
NULL,
CDS_TEST,
NULL) != DISP_CHANGE_SUCCESSFUL)
{
continue;
}
}
if (*count == size)
{
size += 128;
result = (GLFWvidmode*) realloc(result, size * sizeof(GLFWvidmode));
}
(*count)++;
result[*count - 1] = mode;
}
if (!*count)
{
// HACK: Report the current mode if no valid modes were found
result = calloc(1, sizeof(GLFWvidmode));
_glfwPlatformGetVideoMode(monitor, result);
*count = 1;
}
return result;
}
void _glfwPlatformGetVideoMode(_GLFWmonitor* monitor, GLFWvidmode* mode)
{
DEVMODEW dm;
ZeroMemory(&dm, sizeof(dm));
dm.dmSize = sizeof(dm);
EnumDisplaySettingsW(monitor->win32.adapterName, ENUM_CURRENT_SETTINGS, &dm);
mode->width = dm.dmPelsWidth;
mode->height = dm.dmPelsHeight;
mode->refreshRate = dm.dmDisplayFrequency;
_glfwSplitBPP(dm.dmBitsPerPel,
&mode->redBits,
&mode->greenBits,
&mode->blueBits);
}
GLFWbool _glfwPlatformGetGammaRamp(_GLFWmonitor* monitor, GLFWgammaramp* ramp)
{
HDC dc;
WORD values[3][256];
dc = CreateDCW(L"DISPLAY", monitor->win32.adapterName, NULL, NULL);
GetDeviceGammaRamp(dc, values);
DeleteDC(dc);
_glfwAllocGammaArrays(ramp, 256);
memcpy(ramp->red, values[0], sizeof(values[0]));
memcpy(ramp->green, values[1], sizeof(values[1]));
memcpy(ramp->blue, values[2], sizeof(values[2]));
return GLFW_TRUE;
}
void _glfwPlatformSetGammaRamp(_GLFWmonitor* monitor, const GLFWgammaramp* ramp)
{
HDC dc;
WORD values[3][256];
if (ramp->size != 256)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"Win32: Gamma ramp size must be 256");
return;
}
memcpy(values[0], ramp->red, sizeof(values[0]));
memcpy(values[1], ramp->green, sizeof(values[1]));
memcpy(values[2], ramp->blue, sizeof(values[2]));
dc = CreateDCW(L"DISPLAY", monitor->win32.adapterName, NULL, NULL);
SetDeviceGammaRamp(dc, values);
DeleteDC(dc);
}
//////////////////////////////////////////////////////////////////////////
////// GLFW native API //////
//////////////////////////////////////////////////////////////////////////
GLFWAPI const char* glfwGetWin32Adapter(GLFWmonitor* handle)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
return monitor->win32.publicAdapterName;
}
GLFWAPI const char* glfwGetWin32Monitor(GLFWmonitor* handle)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
return monitor->win32.publicDisplayName;
}