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WindowsUndocumentedLib

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Some information on the undocumented Windows API I have discovered.

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# UNDOCUMENTED Windows API

Some information on the undocumented Windows API I have discovered. These have all been discovered using Ghidra (static analysis),
and WinDBG (dynamic analysis)

## DisplayConfigGetDeviceInfo
1. **DisplayConfigGetDeviceInfo(-3)** or **DisplayConfigGetDeviceInfo(DISPLAYCONFIG_DEVICE_INFO_TYPE_UNDOC::DISPLAYCONFIG_DEVICE_INFO_GET_DPI_SCALE)**
Get DPI scaling information for a display.
  - Minimum DPI scaling
  - Maximum DPI scaling
  - Currently applied DPI scaling value
  - Recommended DPI scaling value

REFER(1): https://github.com/lihas/windows-DPI-scaling-sample/tree/master \
REFER(2): https://stackoverflow.com/questions/35233182/how-can-i-change-windows-10-display-scaling-programmatically-using-c-sharp

2. **DisplayConfigGetDeviceInfo(-4)** or **DisplayConfigGetDeviceInfo(DISPLAYCONFIG_DEVICE_INFO_TYPE_UNDOC::DISPLAYCONFIG_DEVICE_INFO_SET_DPI_SCALE)**
Set current DPI scaling value for a display

REFER(1): https://github.com/lihas/windows-DPI-scaling-sample/tree/master \
REFER(2): https://stackoverflow.com/questions/35233182/how-can-i-change-windows-10-display-scaling-programmatically-using-c-sharp

3. **DisplayConfigGetDeviceInfo(-7)** or **DisplayConfigGetDeviceInfo(DISPLAYCONFIG_DEVICE_INFO_TYPE_UNDOC::DISPLAYCONFIG_DEVICE_INFO_GET_MONITOR_BRIGHTNESS_INFO)**
Get monitor brightness info
  - Brightness range supported in nits
  - min luminance
  - max luminance

REFER: Windows_Graphics!Windows::Devices::Display::DisplayMonitor::RuntimeClassInitialize (Windows.Graphics.dll)

4. **DisplayConfigGetDeviceInfo(-7)** or **DisplayConfigGetDeviceInfo(DISPLAYCONFIG_DEVICE_INFO_TYPE_UNDOC::DISPLAYCONFIG_DEVICE_INFO_GET_MONITOR_INTERNAL_INFO)**
This is an alias for DISPLAYCONFIG_DEVICE_INFO_GET_MONITOR_BRIGHTNESS_INFO as the API returns info more than just brightness.
Info other than brightness:
  - Display tech
  - Native Height
  - Native Width
  - Physical Width in mm
  - Physical Height in mm

REFER: Windows_Graphics!Windows::Devices::Display::DisplayMonitor::RuntimeClassInitialize (Windows.Graphics.dll)

5. **DisplayConfigGetDeviceInfo(-8)** or **DisplayConfigGetDeviceInfo(DISPLAYCONFIG_DEVICE_INFO_TYPE_UNDOC::DISPLAYCONFIG_DEVICE_INFO_GET_MONITOR_EDID)**
Get display edid.
  - Edid in 1280 byte buffer
  - Length of returned EDID block in bytes

REFER: Windows_Graphics!Windows::Devices::Display::DisplayMonitor::RuntimeClassInitialize (Windows.Graphics.dll)

6. **DisplayConfigGetDeviceInfo(-13)** or **DisplayConfigGetDeviceInfo(DISPLAYCONFIG_DEVICE_INFO_TYPE_UNDOC::DISPLAYCONFIG_DEVICE_INFO_GET_TARGET_INFO)**
Get target info.
  - Output technology
  - Usage: Standard, Head mounted, Special use
  - Virtual mode disabled
  - Virtual topology disabled
  - Virtual target mode disabled

REFER: Windows_Graphics!Windows::Devices::Display::DisplayMonitor::RuntimeClassInitialize (Windows.Graphics.dll)

7. **DisplayConfigGetDeviceInfo(-15)** or **DisplayConfigGetDeviceInfo(DISPLAYCONFIG_DEVICE_INFO_TYPE_UNDOC::DISPLAYCONFIG_DEVICE_INFO_GET_DISPLAY_ID_DATA)**
Get display ID data.
Perhaps this is used in 2 steps, first to get buffer size, and then calling the api by passing buffer
of required length.

REFER: Windows_Graphics!Windows::Devices::Display::DisplayMonitor::RuntimeClassInitialize (Windows.Graphics.dll)