Using GTK+ on Windows
3
GTK Library

# Using GTK+ on Windows

Windows-specific aspects of using GTK+

## Using GTK+ on Windows

The Windows port of GTK+ is an implementation of GDK (and therefore GTK+) on top of the Win32 API.

### Windows-specific commandline options

The Windows GDK backend can be influenced with some additional command line arguments.

#### --sync

Don't batch GDI requests. This might be a marginally useful option for debugging.

#### --no-wintab, --ignore-wintab

Don't use the Wintab API for tablet support.

#### --use-wintab

Use the Wintab API for tablet support. This is the default.

#### --max-colors number

In 256 color mode, restrict the size of the color palette to the specified number of colors. This option is obsolete.

### Windows-specific environment variables

The Win32 GDK backend can be influenced with some additional environment variables.

#### `GDK_IGNORE_WINTAB`

If this variable is set, GTK+ doesn't use the Wintab API for tablet support.

#### `GDK_USE_WINTAB`

If this variable is set, GTK+ uses the Wintab API for tablet support. This is the default.

#### `GDK_WIN32_MAX_COLORS`

Specifies the size of the color palette used in 256 color mode.