New configure setting "--enable-wayland --disable-x11" to build pure Wayland platform.

CHANGES.txt

@@ -124,7 +124,11 @@ Changes in FLTK 1.4.0                            Released: ??? ?? 2022
   New Configuration Options (ABI Version)
 
   - Configure option --enable-wayland allows to build the FLTK library for
-    the new Wayland platform. The corresponding CMake option is OPTION_USE_WAYLAND.
+    the new Wayland platform while remaining compatible with X11. The
+    corresponding CMake option is OPTION_USE_WAYLAND.
+  - Configure options --enable-wayland --disable-x11 used together allow to
+    build FLTK for the Wayland backend only (no x11 backend). Under CMake, the
+    equivalent is to set both OPTION_USE_WAYLAND and OPTION_WAYLAND_ONLY.
   - The new configure option --disable-gdiplus removes the possibility to draw
     antialiased lines and curves on the Windows platform. The corresponding CMake
     option is OPTION_USE_GDIPLUS.

README.Wayland.txt

@@ -55,20 +55,24 @@ X11 is used at run time as follows:
   compositor is available;
 - if FLTK_BACKEND has another value, the library stops with error.
 
+On pure Wayland systems without the X11 headers and libraries, FLTK can be built
+with its Wayland backend only (see below).
+
  2.1 Configuration
 ------------------
 
-* Configure-based build can be performed as follows:
+   2.1.1 Configure-based build can be performed as follows:
 Once after "git clone", create the configure file :
   autoconf -f
 
 Prepare build with :
-  ./configure --enable-wayland [--enable-shared]
+  ./configure --enable-wayland
+Add  --disable-x11  to build FLTK for Wayland-only (no x11 backend).
 
 Build with :
   make
 
-* CMake-based build can be performed as follows:
+   2.1.2 CMake-based build can be performed as follows:
   cmake -S <path-to-source> -B <path-to-build> -DCMAKE_BUILD_TYPE=Release -DOPTION_USE_WAYLAND=1
 
   cd <path-to-build>; make
@@ -79,6 +83,8 @@ this form of libdecor. Optionally, OPTION_USE_SYSTEM_LIBDECOR can be turned on t
 use the system's version of libdecor which is available on recent Linux distributions (e.g.,
 Debian Bookworm or more recent in packages libdecor-0-0 and libdecor-0-plugin-1-cairo).
 
+Optionally, OPTION_WAYLAND_ONLY can be turned on to build FLTK for Wayland-only (no x11 backend).
+
  2.2 Known Limitations
 ----------------------
 
@@ -91,9 +97,9 @@ Fl_Window::position() has no effect on other top-level windows.
 way to programmatically unset minimization of a window. Consequently, Fl_Window::show() of
 a minimized window has no effect.
 
-* It's currently not possible for an app to be notified of changes to the content of
+* Although the FLTK API to read from and write to the system clipboard is fully functional,
-the system clipboard, that is, Fl::add_clipboard_notify() has no effect. The FLTK API to
+it's currently not possible for an app to be notified of changes to the content of
-read from and write to the system clipboard is fully functional, though.
+the system clipboard, that is, Fl::add_clipboard_notify() has no effect.
 
 * With GTK-style window titlebars, narrow windows are silently forced to be wide enough
 for the titlebar to display window buttons and a few letters of the title.
@@ -149,12 +155,12 @@ function or variable, and that fl_wl_display() returns non-NULL before using any
 Wayland-specific function or variable. Make sure that fl_open_display() was called
 directly or indirectly before using any such symbol.
 
-3.3 Forcing an app to always use the X11 mechanism
+3.3 Forcing an FLTK app to always use the X11 backend
---------------------------------------------------
+-----------------------------------------------------
 
 Alternatively, it's possible to force an FLTK app to use X11 in all
-situations by calling function fl_disable_wayland() early in main(), before
+situations by calling function fl_disable_wayland() early in main(), that is,
-fl_open_display() runs. FLTK source code and also platform-specific
+before fl_open_display() runs. FLTK source code and also platform-specific
 code conceived for FLTK 1.3 should run under 1.4 with that single change only.
 
 

configure.ac

@@ -110,7 +110,7 @@ AC_ARG_ENABLE([localzlib], AS_HELP_STRING([--enable-localzlib], [use local ZLIB
 
 AC_ARG_ENABLE([pango], AS_HELP_STRING([--enable-pango], [turn on Pango support]))
 
-AC_ARG_ENABLE([wayland], AS_HELP_STRING([--enable-wayland], [turn on Wayland support]))
+AC_ARG_ENABLE([wayland], AS_HELP_STRING([--enable-wayland], [turn on hybrid Wayland/X11 support]))
 
 AC_ARG_ENABLE([usecairo], AS_HELP_STRING([--enable-usecairo], [all drawing to X11 windows uses Cairo]))
 
@@ -993,11 +993,16 @@ AS_CASE([$host_os_gui], [cygwin* | mingw*], [
 
       BUILD="WAYLAND"
       AC_DEFINE([FLTK_USE_WAYLAND])
+      graphics="Wayland"
+      AS_IF([test x$enable_x11 != xno], [
        AC_DEFINE([FLTK_USE_X11]) # to build a hybrid Wayland/X11 library
+       BUILD="WAYLANDX11"
+       graphics="Wayland or X11 with cairo"
+       ])
       CFLAGS="$CFLAGS -DUSE_SYSTEM_LIBDECOR=0"
       CXXFLAGS="$CXXFLAGS -DUSE_SYSTEM_LIBDECOR=0"
-      graphics="Wayland or X11 with cairo"
+      LIBS="$LIBS $($PKGCONFIG --libs wayland-cursor) $($PKGCONFIG --libs wayland-client) $($PKGCONFIG --libs xkbcommon) $($PKGCONFIG --libs pangoxft) "
-      LIBS="$LIBS $($PKGCONFIG --libs wayland-cursor) $($PKGCONFIG --libs wayland-client) $($PKGCONFIG --libs xkbcommon) $($PKGCONFIG --libs pangoxft) $($PKGCONFIG --libs x11)"
+      AS_IF([test x$enable_x11 != xno], [LIBS="$LIBS $($PKGCONFIG --libs x11)"] )
       LIBS="$LIBS $($PKGCONFIG --libs dbus-1) -ldl"
       CXXFLAGS="$CXXFLAGS -I../libdecor/src"
       DSOFLAGS="$LIBS $DSOFLAGS"

fluid/Makefile

@@ -50,6 +50,7 @@ CPPFILES_X11 = ExternalCodeEditor_UNIX.cxx
 CPPFILES_XFT = ExternalCodeEditor_UNIX.cxx
 CPPFILES_CAIRO = ExternalCodeEditor_UNIX.cxx
 CPPFILES_WAYLAND = ExternalCodeEditor_UNIX.cxx
+CPPFILES_WAYLANDX11 = ExternalCodeEditor_UNIX.cxx
 
 CPPFILES += $(CPPFILES_$(BUILD))
 

makeinclude.in

@@ -24,7 +24,7 @@ FL_ABI_VERSION		= @FL_ABI_VERSION@
 
 FLTK_VERSION		= @FLTK_VERSION@
 
-# FLTK configuration options: BUILD = { WIN | OSX | X11 | XFT | CAIROXLIB | WAYLAND }
+# FLTK configuration options: BUILD = { WIN | OSX | X11 | XFT | CAIROXLIB | WAYLANDX11 | WAYLAND }
 
 BUILD		= @BUILD@
 UNAME            = @UNAME@

src/Makefile

@@ -211,8 +211,9 @@ GLCPPFILES_CAIRO = $(GLCPPFILES_X11)
 GLCPPFILES_WIN = drivers/WinAPI/Fl_WinAPI_Gl_Window_Driver.cxx \
 		 drivers/WinAPI/fl_WinAPI_gl_platform_init.cxx
 GLCPPFILES_WAYLAND = drivers/Wayland/Fl_Wayland_Gl_Window_Driver.cxx \
-  		     drivers/X11/Fl_X11_Gl_Window_Driver.cxx \
 		     drivers/Wayland/fl_wayland_gl_platform_init.cxx
+GLCPPFILES_WAYLANDX11 = $(GLCPPFILES_WAYLAND) \
+		        drivers/X11/Fl_X11_Gl_Window_Driver.cxx
 
 GLCPPFILES += $(GLCPPFILES_$(BUILD))
 
@@ -290,7 +291,7 @@ XLIBGDFILES = drivers/Xlib/Fl_Xlib_Graphics_Driver.cxx \
 	drivers/Xlib/Fl_Xlib_Graphics_Driver_rect.cxx \
 	drivers/Xlib/Fl_Xlib_Graphics_Driver_vertex.cxx
 
-# These C++ files are used under condition: BUILD_WAYLAND
+# These C++ files are used under conditions: BUILD_WAYLAND or BUILD_WAYLANDX11
 WLCPPFILES = \
 	drivers/Posix/Fl_Posix_Printer_Driver.cxx \
         Fl_Native_File_Chooser_FLTK.cxx \
@@ -305,7 +306,10 @@ WLCPPFILES = \
 	drivers/Wayland/Fl_Wayland_Copy_Surface_Driver.cxx \
 	drivers/Wayland/Fl_Wayland_Graphics_Driver.cxx \
 	drivers/Wayland/fl_wayland_platform_init.cxx \
-	drivers/Wayland/fl_wayland_clipboard_dnd.cxx \
+	drivers/Wayland/fl_wayland_clipboard_dnd.cxx
+
+# These C++ files are used under condition: BUILD_WAYLANDX11
+WLX11CPPFILES = \
 	drivers/X11/Fl_X11_Screen_Driver.cxx \
 	drivers/X11/Fl_X11_Window_Driver.cxx \
 	drivers/X11/Fl_X11_System_Driver.cxx \
@@ -343,7 +347,7 @@ WLCFILES = \
         xutf8/keysym2Ucs.c \
         scandir_posix.c
 
-# These C++ files are used under condition: BUILD_WAYLAND
+# These C++ files are used under conditions: BUILD_WAYLAND or BUILD_WAYLANDX11
 WLXFTFILES = \
 	drivers/Cairo/Fl_Cairo_Graphics_Driver.cxx
 
@@ -382,7 +386,7 @@ FLTKFLAGS = -DFL_LIBRARY
 include ../makeinclude
 
 # makeinclude has set this variable:
-# BUILD = {WIN|X11|XFT|CAIRO|OSX|WAYLAND}
+# BUILD = {WIN|X11|XFT|CAIRO|OSX|WAYLAND|WAYLANDX11}
 
 MMFILES_OSX = $(OBJCPPFILES)
 MMFILES = $(MMFILES_$(BUILD))
@@ -395,6 +399,7 @@ CPPFILES_X11 = $(XLIBCPPFILES) $(XLIBGDFILES) $(XLIBFONTFILES)
 CPPFILES_CAIRO = $(XLIBCPPFILES) $(CAIROGDFILES)
 
 CPPFILES_WAYLAND = $(WLCPPFILES) $(WLXFTFILES)
+CPPFILES_WAYLANDX11 = $(CPPFILES_WAYLAND) $(WLX11CPPFILES)
 
 CPPFILES_WIN = $(GDICPPFILES)
 
@@ -405,12 +410,14 @@ CFILES_X11 = $(XLIBCFILES) $(XLIBXCFILES)
 CFILES_CAIRO = $(XLIBCFILES)
 CFILES_XFT = $(XLIBCFILES)
 
-CFILES_WAYLAND = $(WLCFILES)
+CFILES_WAYLANDX11 = $(WLCFILES)
 EXTRA_OBJECTS_WAYLAND =  ../libdecor/build/fl_libdecor.o ../libdecor/build/libdecor-cairo-blur.o \
   ../libdecor/build/fl_libdecor-plugins.o \
   xdg-decoration-protocol.o xdg-shell-protocol.o text-input-protocol.o \
   ../libdecor/build/cursor-settings.o ../libdecor/build/os-compatibility.o
+EXTRA_OBJECTS_WAYLANDX11 = $(EXTRA_OBJECTS_WAYLAND)
 EXTRA_CXXFLAGS_WAYLAND = -I.
+EXTRA_CXXFLAGS_WAYLANDX11 = $(EXTRA_CXXFLAGS_WAYLAND)
 
 CFILES_WIN = $(GDICFILES)