Add the Wayland platform to FLTK 1.4

FL/platform.H

@@ -37,6 +37,8 @@ class Fl_Window;
 #    include "win32.H"
 #  elif defined(__APPLE__)
 #    include "mac.H"
+#  elif defined(FLTK_USE_WAYLAND)
+#    include "wayland.H"
 #  elif defined(FLTK_USE_X11)
 #    include "x11.H"
 #  endif // _WIN32

FL/platform_types.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2018 by Bill Spitzak and others.
+ * Copyright 2016-2022 by Bill Spitzak and others.
  *
  * This library is free software. Distribution and use rights are outlined in
  * the file "COPYING" which should have been included with this file.  If this
@@ -116,6 +116,17 @@ typedef struct HGLRC__ *GLContext;
    struct dirent {char d_name[1];};
 #endif
 
+#elif defined(FLTK_USE_WAYLAND)
+typedef struct fl_wld_buffer *Fl_Offscreen; /**< an offscreen drawing buffer */
+typedef struct _cairo_pattern* Fl_Bitmask;
+typedef struct flWaylandRegion* Fl_Region;
+typedef int FL_SOCKET; /**< socket or file descriptor */
+typedef void *EGLContext;
+typedef EGLContext GLContext;
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <dirent.h>
+
 #elif defined(FLTK_USE_X11)
 
 typedef unsigned long Fl_Offscreen;

FL/wayland.H

@@ -0,0 +1,31 @@
+//
+// Wayland platform header file for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 1998-2021 by Bill Spitzak and others.
+//
+// This library is free software. Distribution and use rights are outlined in
+// the file "COPYING" which should have been included with this file.  If this
+// file is missing or damaged, see the license at:
+//
+//     https://www.fltk.org/COPYING.php
+//
+// Please see the following page on how to report bugs and issues:
+//
+//     https://www.fltk.org/bugs.php
+//
+
+#if !defined(FL_PLATFORM_H)
+#  error "Never use <FL/wayland.H> directly; include <FL/platform.H> instead."
+#endif // !FL_PLATFORM_H
+
+typedef struct wld_window *Window;
+
+extern struct wl_display *fl_display;
+
+struct flWaylandRegion {
+  int count;
+  struct _cairo_rectangle *rects;
+}; // a region is the union of a series of rectangles
+
+#include <stdint.h>
+extern FL_EXPORT uint32_t fl_event_time;