Skaffold headless backend

Headers/headless/HeadlessContext.h

@@ -0,0 +1,30 @@
+/* HeadlessContext.c - Headless Context
+ * 
+ *  Copyright (c) 2023 Keysight Technologies
+ * 
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *  
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the Free
+ *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef HeadlessContext_h_INCLUDE
+#define HeadlessContext_h_INCLUDE
+
+#include "gsc/GSContext.h"
+
+@interface HeadlessContext : GSContext
+{
+}
+@end
+
+#endif

Headers/headless/HeadlessServer.h

@@ -0,0 +1,32 @@
+/* HeadlessServer.c - Headless Server
+ * 
+ *  Copyright (c) 2023 Keysight Technologies
+ * 
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *  
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the Free
+ *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef HeadlessServer_h_INCLUDE
+#define HeadlessServer_h_INCLUDE
+
+#include "config.h"
+
+#include <GNUstepGUI/GSDisplayServer.h>
+
+@interface HeadlessServer : GSDisplayServer
+{
+}
+@end
+
+#endif /* HeadlessServer_h_INCLUDE */

Source/GSBackend.m

@@ -50,6 +50,11 @@
 @interface WaylandServer (Initialize)
 + (void) initializeBackend;
 @end
+#elif BUILD_SERVER == SERVER_headless
+#include <headless/HeadlessServer.h>
+@interface HeadlessServer (Initialize)
++ (void) initializeBackend;
+@end
 #endif
 
 /* Call the correct initalization routines for the choosen
@@ -70,6 +75,8 @@
   [WIN32Server initializeBackend];
 #elif BUILD_SERVER == SERVER_wayland
   [WaylandServer initializeBackend];
+#elif BUILD_SERVER == SERVER_xheadless
+  [HeadlessServer initializeBackend];
 #else
   [NSException raise: NSInternalInconsistencyException
 	       format: @"No Window Server configured in backend"];
@@ -96,6 +103,8 @@
     context = @"CairoContext";
 #elif (BUILD_GRAPHICS==GRAPHICS_opal)
     context = @"OpalContext";
+#elif (BUILD_GRAPHICS==GRAPHICS_headless)
+    context = @"HeadlessContext";    
 #else
 #error INVALID build graphics type
 #endif

Source/headless/GNUmakefile

@@ -0,0 +1,42 @@
+#
+#  Main makefile for GNUstep Headless Backend
+#
+#  Copyright (C) 2002 Free Software Foundation, Inc.
+#
+#  Author: Adam Fedor <fedor@gnu.org>
+#
+#  This file is part of the GNUstep Backend.
+#
+#  This library is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU Lesser General Public
+#  License as published by the Free Software Foundation; either
+#  version 2 of the License, or (at your option) any later version.
+#
+#  This library is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
+#  Lesser General Public License for more details.
+#
+#  You should have received a copy of the GNU Lesser General Public
+#  License along with this library; see the file COPYING.LIB.
+#  If not, see <http://www.gnu.org/licenses/> or write to the 
+#  Free Software Foundation, 51 Franklin Street, Fifth Floor, 
+
+PACKAGE_NAME = gnustep-back
+GNUSTEP_LOCAL_ADDITIONAL_MAKEFILES=../../back.make
+
+include $(GNUSTEP_MAKEFILES)/common.make
+
+include ../../config.make
+
+# The library to be compiled, as a library or as a bundle
+SUBPROJECT_NAME=xheadless
+
+# The Objective-C source files to be compiled
+xheadless_OBJC_FILES = 
+
+-include GNUmakefile.preamble
+
+include $(GNUSTEP_MAKEFILES)/subproject.make
+
+-include GNUmakefile.postamble

Source/headless/GNUmakefile.preamble

@@ -0,0 +1,51 @@
+#
+#  GNUmakefile.preamble
+#
+#  Copyright (C) 2002 Free Software Foundation, Inc.
+#
+#  Author: Adam Fedor <fedor@gnu.org>
+#
+#  This file is part of the GNUstep Backend.
+#
+#  This library is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU Lesser General Public
+#  License as published by the Free Software Foundation; either
+#  version 2 of the License, or (at your option) any later version.
+#
+#  This library is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
+#  Lesser General Public License for more details.
+#
+#  You should have received a copy of the GNU Lesser General Public
+#  License along with this library; see the file COPYING.LIB.
+#  If not, see <http://www.gnu.org/licenses/> or write to the 
+#  Free Software Foundation, 51 Franklin Street, Fifth Floor, 
+#  Boston, MA 02110-1301, USA.
+
+#
+# Flags dealing with compiling and linking
+#
+
+# Additional flags to pass to the preprocessor
+ADDITIONAL_CPPFLAGS += -Wall $(CONFIG_SYSTEM_DEFS)
+
+# Additional flags to pass to the Objective-C compiler
+ADDITIONAL_OBJCFLAGS = 
+
+# Additional flags to pass to the C compiler
+ADDITIONAL_CFLAGS = 
+
+# Additional include directories the compiler should search
+ADDITIONAL_INCLUDE_DIRS += -I../../Headers \
+	-I../$(GNUSTEP_TARGET_DIR) $(GRAPHIC_CFLAGS)
+
+# Additional LDFLAGS to pass to the linker
+ADDITIONAL_LDFLAGS =
+
+# Additional library directories the linker should search
+ADDITIONAL_LIB_DIRS =
+
+#
+# Flags dealing with installing and uninstalling
+#

Source/headless/HeadlessContext.m

@@ -0,0 +1,26 @@
+/* HeadlessContext.m - Headless Context
+ * 
+ *  Copyright (c) 2023 Keysight Technologies
+ * 
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *  
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the Free
+ *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "config.h"
+
+#include "Headless/HeadlessContext.h"
+
+@implementation HeadlessContext
+
+@end

Source/headless/HeadlessServer.m

@@ -0,0 +1,26 @@
+/* HeadlessServer.m - Headless Server
+ * 
+ *  Copyright (c) 2023 Keysight Technologies
+ * 
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *  
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the Free
+ *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "config.h"
+
+#include "Headless/HeadlessServer.h"
+
+@implementation HeadlessServer
+
+@end

configure.ac

@@ -565,10 +565,10 @@ case $target_os in
 esac
 
 AC_ARG_ENABLE(server, 
-  [  --enable-server=SRV     Build server type: x11, win32, wayland],,
+  [  --enable-server=SRV     Build server type: x11, win32, wayland, headless],,
   enable_server=$BUILD_SERVER)
 AC_ARG_ENABLE(graphics, 
-  [  --enable-graphics=GPH   Build graphics: xlib, xdps, winlib, art, cairo, opal],,
+  [  --enable-graphics=GPH   Build graphics: xlib, xdps, winlib, art, cairo, opal, headless],,
   enable_graphics="$BUILD_GRAPHICS")
 
 BUILD_SERVER=$enable_server
@@ -658,8 +658,6 @@ if test x"$BUILD_GRAPHICS" = "xcairo"; then
       CAIRO_LIBS="$CAIRO_LIBS $XFT_LIBS"
       CAIRO_CFLAGS="$CAIRO_CFLAGS"
       LIBS="-lwayland-client -lwayland-cursor -lxkbcommon $LIBS"
-    else
-      AC_MSG_ERROR([Invalid Cairo installation])
     fi
     LIBS="$CAIRO_LIBS $LIBS"
     CPPFLAGS="$CAIRO_CFLAGS $CPPFLAGS"
@@ -717,6 +715,8 @@ elif test x"$BUILD_GRAPHICS" = "xopal"; then
     fi
     AC_MSG_NOTICE([Switching to $BUILD_GRAPHICS])
   fi
+elif test x"$BUILD_GRAPHICS" = "xheadless"; then
+ : # Nothing to do
 else
   AC_MSG_ERROR([Invalid graphics backend $BUILD_GRAPHICS])
 fi
@@ -757,15 +757,17 @@ if test $BUILD_SERVER = win32; then
 fi
 
 AH_TOP([
-#define SERVER_x11      1
-#define SERVER_win32    2
-#define SERVER_wayland  3
-#define GRAPHICS_xdps   0
-#define GRAPHICS_art    1
-#define GRAPHICS_xlib   2
-#define GRAPHICS_winlib 3
-#define GRAPHICS_cairo  4
-#define GRAPHICS_opal   5
+#define SERVER_x11        1
+#define SERVER_win32      2
+#define SERVER_wayland    3
+#define SERVER_headless   4
+#define GRAPHICS_xdps     0
+#define GRAPHICS_art      1
+#define GRAPHICS_xlib     2
+#define GRAPHICS_winlib   3
+#define GRAPHICS_cairo    4
+#define GRAPHICS_opal     5
+#define GRAPHICS_headless 6
 ])
 AC_DEFINE_UNQUOTED(BUILD_SERVER,SERVER_$BUILD_SERVER,
 	[Define to type of window server to build])