diff --git a/CMakeLists.txt b/CMakeLists.txt

index ebc3e263..672fefd4 100644

--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -66,6 +66,7 @@ option (ENABLE_TUI "Enable the Curses TUI instead of GUI" OFF)

option (ENABLE_WEBP "Use libwebp to decode .webp images (via pkg-config)" ON)

option (ENABLE_WINDOWPOS_FIX "Set position after showing window (workaround for SDL bug)" OFF)

option (ENABLE_WINSPARKLE "Use WinSparkle for automatic updates (Windows)" OFF)

+option (ENABLE_X11_XLIB "Use Xlib directly, if available (X11)" ON)

option (ENABLE_X11_SWRENDER "Use software rendering (X11)" OFF)

set (CACERT_PEM_PATH "" CACHE FILEPATH "Root CA cacert.pem file to include as a built-in resource")



@@ -303,6 +304,12 @@ if (ENABLE_IPC) 

     src/ipc.h


 )

endif ()

+if (ENABLE_X11_XLIB AND XLIB_FOUND)

+ list (APPEND SOURCES

+ src/x11.c

+ src/x11.h

+ )

+endif ()

if (ANDROID) 

 set (MOBILE 1)


 add_definitions (-DiPlatformAndroidMobile=1)

@@ -432,6 +439,9 @@ endif ()

if (ENABLE_WINDOWPOS_FIX) 

 target_compile_definitions (app PUBLIC LAGRANGE_ENABLE_WINDOWPOS_FIX=1)

endif ()

+if (TARGET x11-lib)

+ target_link_libraries (app PUBLIC x11-lib)

+endif ()

if (ENABLE_X11_SWRENDER) 

 target_compile_definitions (app PUBLIC LAGRANGE_ENABLE_X11_SWRENDER=1)

endif ()

diff --git a/Depends.cmake b/Depends.cmake

index 0ffaef90..debd0410 100644

--- a/Depends.cmake

+++ b/Depends.cmake

@@ -1,4 +1,4 @@

-find_package (PkgConfig)

+find_package (PkgConfig REQUIRED)



if (IOS) 

 include (Depends-iOS.cmake)

@@ -10,7 +10,6 @@ if (ANDROID) 

 return ()

endif ()



-find_package (PkgConfig)

find_program (MESON_EXECUTABLE meson DOC "Meson build system")

find_program (NINJA_EXECUTABLE ninja DOC "Ninja build tool")

include (ExternalProject)

@@ -192,7 +191,18 @@ if (ENABLE_WINSPARKLE) 

 message (STATUS "Using WinSparkle: ${WINSPARKLE_DLL}")

endif ()



-find_package (PkgConfig REQUIRED)

+if (ENABLE_X11_XLIB AND NOT ENABLE_TUI)

+ find_package (X11)

+ if (X11_FOUND)

+ set (XLIB_FOUND YES)

+ add_library (x11-lib INTERFACE)

+ target_link_libraries (x11-lib INTERFACE ${X11_LIBRARIES})

+ target_include_directories (x11-lib INTERFACE ${X11_INCLUDE_DIRS})

+ target_compile_definitions (x11-lib INTERFACE LAGRANGE_ENABLE_X11_XLIB=1)

+ message (STATUS "Using Xlib: ${X11_LIBRARIES}")

+ endif ()

+endif ()

+

if (ENABLE_TUI) 

 pkg_check_modules (SDL2 REQUIRED sealcurses)

else ()

diff --git a/res/about/version.gmi b/res/about/version.gmi

index 207d90f2..62f3aa5f 100644

--- a/res/about/version.gmi

+++ b/res/about/version.gmi

@@ -11,6 +11,7 @@ New features:



Changes and enhancements:

+* GTK: Request dark window theme if the app UI color theme is dark.



Fixes:



diff --git a/src/app.c b/src/app.c

index fded9721..9697a7c5 100644

--- a/src/app.c

+++ b/src/app.c

@@ -84,6 +84,9 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

#if defined (iPlatformMsys)

include "win32.h"

#endif

+#if defined (LAGRANGE_ENABLE_X11_XLIB)

+# include "x11.h"

+#endif

#if SDL_VERSION_ATLEAST(2, 0, 14)

include <SDL_misc.h>

#endif

@@ -2016,6 +2019,9 @@ void processEvents_App(enum iAppEventMode eventMode) {

#endif

#if defined (iPlatformMsys) 

                 handleCommand_Win32(command_UserEvent(&ev));

+#endif

+#if defined (LAGRANGE_ENABLE_X11_XLIB)

+ handleCommand_X11(command_UserEvent(&ev));

#endif 

                 if (isMetricsChange_UserEvent(&ev)) {


                     listWindows_App_(d, &windows);

diff --git a/src/x11.c b/src/x11.c

new file mode 100644

index 00000000..e7e0d738

--- /dev/null

+++ b/src/x11.c

@@ -0,0 +1,55 @@

+/* Copyright 2023 Jaakko Keränen jaakko.keranen@iki.fi

+

+Redistribution and use in source and binary forms, with or without

+modification, are permitted provided that the following conditions are met:

+

+1. Redistributions of source code must retain the above copyright notice, this

+ list of conditions and the following disclaimer.

+2. Redistributions in binary form must reproduce the above copyright notice,

+ this list of conditions and the following disclaimer in the documentation

+ and/or other materials provided with the distribution.

+

+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND

+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR

+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON

+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

+

+#include "x11.h"

+#include "ui/command.h"

+#include "ui/window.h"

+#include "prefs.h"

+#include "app.h"

+

+#include <SDL_syswm.h>

+#include <X11/Xlib.h>

+#include <X11/Xatom.h>

+

+void setDarkWindowTheme_SDLWindow(SDL_Window *d, iBool setDark) {

+ SDL_SysWMinfo wmInfo;

+ SDL_VERSION(&wmInfo.version);

+ if (SDL_GetWindowWMInfo(d, &wmInfo)) {

+ Display * dpy = wmInfo.info.x11.display;

+ Window wnd = wmInfo.info.x11.window;

+ Atom prop = XInternAtom(dpy, "_GTK_THEME_VARIANT", False); 

+ const char *value = setDark ? "dark" : "light";

+ XChangeProperty(dpy, wnd, prop, XA_STRING, 8, PropModeReplace,

+ (unsigned char *) value, strlen(value));

+ }

+}

+

+void handleCommand_X11(const char *cmd) {

+ if (equal_Command(cmd, "theme.changed")) { 

+ iConstForEach(PtrArray, iter, mainWindows_App()) {

+ iMainWindow *mw = iter.ptr;

+ setDarkWindowTheme_SDLWindow(

+ mw->base.win, isDark_ColorTheme(prefs_App()->theme));

+ }

+ }

+}

+

diff --git a/src/x11.h b/src/x11.h

new file mode 100644

index 00000000..2eb195ad

--- /dev/null

+++ b/src/x11.h

@@ -0,0 +1,30 @@

+/* Copyright 2023 Jaakko Keränen jaakko.keranen@iki.fi

+

+Redistribution and use in source and binary forms, with or without

+modification, are permitted provided that the following conditions are met:

+

+1. Redistributions of source code must retain the above copyright notice, this

+ list of conditions and the following disclaimer.

+2. Redistributions in binary form must reproduce the above copyright notice,

+ this list of conditions and the following disclaimer in the documentation

+ and/or other materials provided with the distribution.

+

+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND

+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR

+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON

+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

+

+#pragma once

+

+#include <the_Foundation/defs.h>

+#include <SDL_video.h>

+

+void setDarkWindowTheme_SDLWindow (SDL_Window *, iBool setDark);

+void handleCommand_X11 (const char *cmd);

+

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