Add a CMake module for icon conversions

cmake/AddThreads.cmake

@@ -9,15 +9,15 @@ find_package (Threads)
 function (add_threads target)
 	if (NOT Threads_FOUND OR NOT CMAKE_USE_PTHREADS_INIT)
 		message (FATAL_ERROR "pthreads not found")
-	endif (NOT Threads_FOUND OR NOT CMAKE_USE_PTHREADS_INIT)
+	endif ()
 
 	if (THREADS_HAVE_PTHREAD_ARG)
 		set_property (TARGET ${target} PROPERTY
 			COMPILE_OPTIONS "-pthread")
 		set_property (TARGET ${target} PROPERTY
 			INTERFACE_COMPILE_OPTIONS "-pthread")
-	endif (THREADS_HAVE_PTHREAD_ARG)
+	endif ()
 	if (CMAKE_THREAD_LIBS_INIT)
 		target_link_libraries (${target} "${CMAKE_THREAD_LIBS_INIT}")
-	endif (CMAKE_THREAD_LIBS_INIT)
+	endif ()
-endfunction (add_threads)
+endfunction ()

cmake/IconUtils.cmake

@@ -0,0 +1,40 @@
+# Public Domain
+
+function (icon_to_png name svg size output_dir output)
+	set (_dimensions "${size}x${size}")
+	set (_png_path "${output_dir}/hicolor/${_dimensions}/apps")
+	set (_png "${_png_path}/${name}.png")
+	set (${output} "${_png}" PARENT_SCOPE)
+
+	set (_find_program_REQUIRE)
+	if (NOT ${CMAKE_VERSION} VERSION_LESS 3.18.0)
+		set (_find_program_REQUIRE REQUIRED)
+	endif ()
+
+	find_program (rsvg_convert_EXECUTABLE rsvg-convert ${_find_program_REQUIRE})
+	add_custom_command (OUTPUT "${_png}"
+		COMMAND ${CMAKE_COMMAND} -E make_directory "${_png_path}"
+		COMMAND ${rsvg_convert_EXECUTABLE} "--output=${_png}"
+			"--width=${size}" "--height=${size}" -- "${svg}"
+		DEPENDS "${svg}"
+		COMMENT "Generating ${name} ${_dimensions} application icon" VERBATIM)
+endfunction ()
+
+# You should include a 256x256 icon--which takes less space as raw PNG.
+function (icon_for_win32 ico pngs pngs_raw)
+	set (_raws)
+	foreach (png ${pngs_raw})
+		list (APPEND _raws "--raw=${png}")
+	endforeach ()
+
+	set (_find_program_REQUIRE)
+	if (NOT ${CMAKE_VERSION} VERSION_LESS 3.18.0)
+		set (_find_program_REQUIRE REQUIRED)
+	endif ()
+
+	find_program (icotool_EXECUTABLE icotool ${_find_program_REQUIRE})
+	add_custom_command (OUTPUT "${ico}"
+		COMMAND ${icotool_EXECUTABLE} -c -o "${ico}" ${_raws} -- ${pngs}
+		DEPENDS ${pngs} ${pngs_raw}
+		COMMENT "Generating Windows program icon" VERBATIM)
+endfunction ()