/usr/include/plplot/plxwd.h is in libplplot-dev 5.9.9-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// Holds system header includes, prototypes of xwin driver
// utility functions, and definition of the state structure.
//
#ifndef __PLXWD_H__
#define __PLXWD_H__
#include "plplot.h"
#include "plstrm.h"
#ifdef PL_HAVE_PTHREAD
#include <pthread.h>
#endif
// System headers
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/cursorfont.h>
#include <X11/keysym.h>
// Specify max number of displays in use
#define PLXDISPLAYS 100
// Set constants for dealing with colormap. In brief:
//
// ccmap When set, turns on custom color map
//
// See Init_CustomCmap() and Init_DefaultCmap() for more info.
// Set ccmap at your own risk -- still under development.
//
static int plplot_ccmap = 0;
// One of these holds the display info, shared by all streams on a given
// display
typedef struct
{
int nstreams; // Number of streams using display
int ixwd; // Specifies xwDisplay number
char *displayName; // Name of X display
int screen; // X screen
Display *display; // X display
Visual *visual; // X Visual
GC gcXor; // Graphics context for XOR draws
Colormap map; // Colormap
unsigned depth; // display depth
int color; // Set to 1 if a color output device
int ncol0; // Number of cmap 0 colors
int ncol0_alloc; // Keeps track of storage for *cmap0
int ncol1; // Number of cmap 1 colors
int ncol1_alloc; // Keeps track of storage for *cmap1
XColor *cmap0; // Color entries for cmap 0
XColor *cmap1; // Color entries for cmap 1
XColor fgcolor; // Foreground color (if grayscale)
Cursor xhair_cursor; // Crosshair cursor
int rw_cmap; // Can we allocate r/w color cells?
} XwDisplay;
// One of these holds the X driver state information
typedef struct
{
XwDisplay *xwd; // Pointer to display info
int is_main; // Set if the toplevel X window
Window window; // X window id
Pixmap pixmap; // Off-screen pixmap
GC gc; // Graphics context
XColor curcolor; // Current pen color
long event_mask; // Event mask
int exit_eventloop; // Breaks the event loop when set
long init_width; // Initial window width
long init_height; // Initial window height
unsigned width, height, border; // Current window dimensions
double xscale_init; // initial pixels/lx (virt. coords)
double yscale_init; // initial pixels/ly (virt. coords)
double xscale; // as above, but current value
double yscale; // (after possible resizing)
short xlen, ylen; // Lengths of device coord space
int write_to_window; // Set if plotting direct to window
int write_to_pixmap; // Set if plotting to pixmap
int instr; // Instruction timer
int max_instr; // Limit before X server is queried
PLGraphicsIn gin; // Graphics input structure
int locate_mode; // Set while in locate mode
int drawing_xhairs; // Set during xhair draws
XPoint xhair_x[2], xhair_y[2]; // Crosshair lines
void ( *MasterEH )( PLStream *, XEvent * ); // Master X event handler
#ifdef PL_HAVE_PTHREAD
pthread_t updater; // The X events updater thread id
#endif
XColor bgcolor; // Background color
} XwDev;
#endif // __PLXWD_H__
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