+/* Is this right? */
+#define PropertyChangeMask GR_EVENT_MASK_SELECTION_CHANGED
+#define GraphicsExpose GR_EVENT_TYPE_EXPOSURE
+#define GraphicsExposeMask GR_EVENT_MASK_EXPOSURE
+
+#define XSynchronize(display,sync)
+#define XDefaultRootWindow(d) GR_ROOT_WINDOW_ID
+#define XFreePixmap(d, p) GrDestroyWindow(p)
+#define XFreeCursor(d, c) GrDestroyCursor(c)
+#define DefaultVisual(d, s) ((Visual*) NULL)
+
+/* These defines are wrongly defined in XtoNX.h, IMHO,
+ * since they reference a static global.
+ * Redefined as functions, below.
+ */
+
+#undef DisplayWidth
+#undef DisplayHeight
+#undef DefaultDepth
+
+/*
+ * Data structure used by color operations
+ */
+typedef struct {
+ unsigned long pixel;
+ unsigned short red, green, blue;
+ char flags; /* do_red, do_green, do_blue */
+ char pad;
+} XColor;
+
+typedef struct {
+ int type;
+ Display *display; /* Display the event was read from */
+ XID resourceid; /* resource id */
+ unsigned long serial; /* serial number of failed request */
+ unsigned char error_code; /* error code of failed request */
+ unsigned char request_code; /* Major op-code of failed request */
+ unsigned char minor_code; /* Minor op-code of failed request */
+} XErrorEvent;
+
+/*
+ * Visual structure; contains information about colormapping possible.
+ */
+typedef struct {
+ void *ext_data; /* hook for extension to hang data */
+ VisualID visualid; /* visual id of this visual */
+#if defined(__cplusplus) || defined(c_plusplus)
+ int c_class; /* C++ class of screen (monochrome, etc.) */
+#else
+ int class; /* class of screen (monochrome, etc.) */
+#endif
+ unsigned long red_mask, green_mask, blue_mask; /* mask values */
+ int bits_per_rgb; /* log base 2 of distinct color values */
+ int map_entries; /* color map entries */
+} Visual;
+
+/*
+ * Depth structure; contains information for each possible depth.
+ */
+typedef struct {
+ int depth; /* this depth (Z) of the depth */
+ int nvisuals; /* number of Visual types at this depth */
+ Visual *visuals; /* list of visuals possible at this depth */
+} Depth;
+
+/*
+ * Information about the screen. The contents of this structure are
+ * implementation dependent. A Screen should be treated as opaque
+ * by application code.
+ */
+
+struct _XDisplay; /* Forward declare before use for C++ */
+
+typedef struct {
+ void *ext_data; /* hook for extension to hang data */
+ struct _XDisplay *display;/* back pointer to display structure */
+ Window root; /* Root window id. */
+ int width, height; /* width and height of screen */
+ int mwidth, mheight; /* width and height of in millimeters */
+ int ndepths; /* number of depths possible */
+ Depth *depths; /* list of allowable depths on the screen */
+ int root_depth; /* bits per pixel */
+ Visual *root_visual; /* root visual */
+ GC default_gc; /* GC for the root root visual */
+ Colormap cmap; /* default color map */
+ unsigned long white_pixel;
+ unsigned long black_pixel; /* White and Black pixel values */
+ int max_maps, min_maps; /* max and min color maps */
+ int backing_store; /* Never, WhenMapped, Always */
+ Bool save_unders;
+ long root_input_mask; /* initial root input mask */
+} Screen;
+