[client] clipboard/wayland: implement a no-op Wayland clipboard

Build scaffolding only; implementation in later commits.

Co-authored-by: Quantum <quantum2048@gmail.com>

client/CMakeLists.txt

@@ -24,6 +24,9 @@ add_feature_info(ENABLE_EGL ENABLE_EGL "EGL renderer.")
 option(ENABLE_CB_X11 "Enable X11 clipboard integration" ON)
 add_feature_info(ENABLE_CB_X11 ENABLE_CB_X11 "X11 Clipboard Integration.")
 
+option(ENABLE_CB_WAYLAND "Enable Wayland clipboard integration" ON)
+add_feature_info(ENABLE_CB_WAYLAND ENABLE_CB_WAYLAND "Wayland Clipboard Integration.")
+
 option(ENABLE_BACKTRACE "Enable backtrace support on crash" ON)
 add_feature_info(ENABLE_BACKTRACE ENABLE_BACKTRACE "Backtrace support.")
 

client/clipboards/CMakeLists.txt

@@ -23,6 +23,10 @@ if (ENABLE_CB_X11)
   add_clipboard(X11)
 endif()
 
+if (ENABLE_CB_WAYLAND)
+  add_clipboard(Wayland)
+endif()
+
 list(REMOVE_AT CLIPBOARDS      0)
 list(REMOVE_AT CLIPBOARDS_LINK 0)
 

client/clipboards/Wayland/CMakeLists.txt

@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.0)
+project(clipboard_Wayland LANGUAGES C)
+
+find_package(PkgConfig)
+pkg_check_modules(CLIPBOARD_PKGCONFIG REQUIRED
+	wayland-client
+)
+
+add_library(clipboard_Wayland STATIC
+	src/wayland.c
+)
+
+target_link_libraries(clipboard_Wayland
+	${CLIPBOARD_PKGCONFIG_LIBRARIES}
+	lg_common
+)
+
+target_include_directories(clipboard_Wayland
+	PUBLIC
+		$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+		$<INSTALL_INTERFACE:include>
+	PRIVATE
+		src
+		${CLIPBOARD_PKGCONFIG_INCLUDE_DIRS}
+)

client/clipboards/Wayland/src/wayland.c

@@ -0,0 +1,92 @@
+/*
+Looking Glass - KVM FrameRelay (KVMFR) Client
+Copyright (C) 2017-2019 Geoffrey McRae <geoff@hostfission.com>
+https://looking-glass.hostfission.com
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; either version 2 of the License, or (at your option) any later
+version.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include "interface/clipboard.h"
+#include "common/debug.h"
+
+struct state
+{
+  LG_ClipboardReleaseFn releaseFn;
+  LG_ClipboardRequestFn requestFn;
+  LG_ClipboardNotifyFn  notifyFn;
+  LG_ClipboardDataFn    dataFn;
+  LG_ClipboardData      type;
+};
+
+static struct state * this = NULL;
+
+static const char * wayland_cb_getName()
+{
+  return "Wayland";
+}
+
+static bool wayland_cb_init(
+    SDL_SysWMinfo         * wminfo,
+    LG_ClipboardReleaseFn   releaseFn,
+    LG_ClipboardNotifyFn    notifyFn,
+    LG_ClipboardDataFn      dataFn)
+{
+  if (wminfo->subsystem != SDL_SYSWM_WAYLAND)
+  {
+    DEBUG_ERROR("wrong subsystem");
+    return false;
+  }
+
+  this = (struct state *)malloc(sizeof(struct state));
+  memset(this, 0, sizeof(struct state));
+
+  this->releaseFn = releaseFn;
+  this->notifyFn  = notifyFn;
+  this->dataFn    = dataFn;
+  return true;
+}
+
+static void wayland_cb_free()
+{
+  free(this);
+  this = NULL;
+}
+
+static void wayland_cb_wmevent(SDL_SysWMmsg * msg)
+{
+}
+
+static void wayland_cb_notice(LG_ClipboardRequestFn requestFn, LG_ClipboardData type)
+{
+}
+
+static void wayland_cb_release()
+{
+  this->requestFn = NULL;
+}
+
+static void wayland_cb_request(LG_ClipboardData type)
+{
+}
+
+const LG_Clipboard LGC_Wayland =
+{
+  .getName = wayland_cb_getName,
+  .init    = wayland_cb_init,
+  .free    = wayland_cb_free,
+  .wmevent = wayland_cb_wmevent,
+  .notice  = wayland_cb_notice,
+  .release = wayland_cb_release,
+  .request = wayland_cb_request
+};