Add JPEG XL screenshot capture to gamescope

meson_options.txt

@@ -3,6 +3,7 @@ option('rt_cap',                     type: 'feature', description: 'Support for
 option('drm_backend',                type: 'feature', description: 'DRM Atomic Backend')
 option('sdl2_backend',               type: 'feature', description: 'SDL2 Window Backend')
 option('avif_screenshots',           type: 'feature', description: 'Support for saving .AVIF HDR screenshots')
+option('jxl_screenshots',            type: 'feature', description: 'Support for saving .JXL HDR screenshots')
 option('input_emulation' ,           type: 'feature', description: 'Support for XTest/Input Emulation with libei')
 option('enable_gamescope',           type : 'boolean', value : true, description: 'Build Gamescope executable')
 option('enable_gamescope_wsi_layer', type : 'boolean', value : true, description: 'Build Gamescope layer')

src/main.cpp

@@ -144,6 +144,7 @@ const struct option *gamescope_options = (struct option[]){
 	{ "hdr-itm-enabled", no_argument, nullptr, 0 },
 	{ "hdr-itm-sdr-nits", required_argument, nullptr, 0 },
 	{ "hdr-itm-target-nits", required_argument, nullptr, 0 },
+	{ "screenshot-format", required_argument, nullptr, 0 },
 	{ "hdr-debug-force-support", no_argument, nullptr, 0 },
 	{ "hdr-debug-force-output", no_argument, nullptr, 0 },
 	{ "hdr-debug-heatmap", no_argument, nullptr, 0 },
@@ -212,6 +213,7 @@ const char usage[] =
 	"                                 Default: 100 nits, Max: 1000 nits\n"
 	"  --hdr-itm-target-nits          set the target luminace of the inverse tone mapping process.\n"
 	"                                 Default: 1000 nits, Max: 10000 nits\n"
+	"  --screenshot-format            0: AVIF, 1: JXL\n"
 	"  --framerate-limit              Set a simple framerate limit. Used as a divisor of the refresh rate, rounds down eg 60 / 59 -> 60fps, 60 / 25 -> 30fps. Default: 0, disabled.\n"
 	"  --mangoapp                     Launch with the mangoapp (mangohud) performance overlay enabled. You should use this instead of using mangohud on the game or gamescope.\n"
 	"  --adaptive-sync                Enable adaptive sync if available (variable rate refresh)\n"

src/meson.build

@@ -23,6 +23,8 @@ cap_dep = dependency('libcap', required: get_option('rt_cap'))
 epoll_dep = dependency('epoll-shim', required: false)
 sdl2_dep = dependency('SDL2', required: get_option('sdl2_backend'))
 avif_dep = dependency('libavif', version: '>=1.0.0', required: get_option('avif_screenshots'))
+jxl_dep = dependency('libjxl', version: '>=0.7.0', required: get_option('jxl_screenshots'))
+jxl_threads_dep = dependency('libjxl_threads', version: '>=0.7.0', required: get_option('jxl_screenshots'))
 pixman_dep = dependency('pixman-1')
 udev_dep = dependency('libudev')
 
@@ -105,6 +107,7 @@ src = [
   'Script/Script.cpp',
   'BufferMemo.cpp',
   'steamcompmgr.cpp',
+  'screenshot_format.cpp',
   'convar.cpp',
   'commit.cpp',
   'color_helpers.cpp',
@@ -149,6 +152,7 @@ endif
 gamescope_cpp_args += '-DHAVE_DRM=@0@'.format(drm_dep.found().to_int())
 gamescope_cpp_args += '-DHAVE_SDL2=@0@'.format(sdl2_dep.found().to_int())
 gamescope_cpp_args += '-DHAVE_AVIF=@0@'.format(avif_dep.found().to_int())
+gamescope_cpp_args += '-DHAVE_JXL=@0@'.format(jxl_dep.found().to_int())
 gamescope_cpp_args += '-DHAVE_LIBCAP=@0@'.format(cap_dep.found().to_int())
 gamescope_cpp_args += '-DHAVE_LIBEIS=@0@'.format(eis_dep.found().to_int())
 gamescope_cpp_args += '-DHAVE_LIBSYSTEMD=@0@'.format(libsystemd_dep.found().to_int())
@@ -198,7 +202,7 @@ gamescope_version = configure_file(
       dep_xxf86vm, dep_xres, glm_dep, drm_dep, wayland_server,
       xkbcommon, thread_dep, sdl2_dep, wlroots_dep,
       vulkan_dep, liftoff_dep, dep_xtst, dep_xmu, cap_dep, epoll_dep, pipewire_dep, librt_dep,
-      stb_dep, displayinfo_dep, openvr_dep, dep_xcursor, avif_dep, dep_xi,
+      stb_dep, displayinfo_dep, openvr_dep, dep_xcursor, avif_dep, jxl_dep, jxl_threads_dep, dep_xi,
       libdecor_dep, eis_dep, luajit_dep, libinput_dep, libsystemd_dep, pixman_dep, udev_dep,
     ],
     install: true,

src/screenshot_format.cpp

@@ -0,0 +1,4 @@
+#include "screenshot_format.h"
+
+// Initialize as AVIF
+screenshot_format format = screenshot_format::AVIF;

src/screenshot_format.h

@@ -0,0 +1,9 @@
+#pragma once
+
+enum class screenshot_format : int {
+    AVIF = 0,
+    JXL = 1
+};
+
+// Global variable declaration
+extern screenshot_format format;