Allow configuring diag font path at build time

This allows for better integration with distros that put the system font
in a different directory.

src/CMakeLists.txt

@@ -12,6 +12,14 @@ set(CASPARCG_DOWNLOAD_CACHE ${CMAKE_CURRENT_BINARY_DIR}/external CACHE STRING "D
 
 option(ENABLE_HTML "Enable HTML module, require CEF" ON)
 
+set(DIAG_FONT_PATH "LiberationMono-Regular.ttf" CACHE STRING
+    "Path to font that will be used to load diag font at runtime. By default
+    this loads the font distribtued with the application from the working
+    directory. It can be set to an absolute path to instead load a font from
+    the system."
+)
+add_compile_definitions("DIAG_FONT_PATH=\"${DIAG_FONT_PATH}\"")
+
 # Add custom cmake modules path
 SET (CASPARCG_PATCH_DIR ${CMAKE_SOURCE_DIR}/CMakeModules/patches)
 LIST (APPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/CMakeModules)

src/CMakeModules/Bootstrap_Linux.cmake

@@ -42,7 +42,7 @@ if (NOT USE_SYSTEM_FFMPEG)
 else()
 	FIND_PACKAGE (FFmpeg REQUIRED)
 	LINK_DIRECTORIES("${FFMPEG_LIBRARY_DIRS}")
-	
+
 	SET (FFMPEG_INCLUDE_PATH "${FFMPEG_INCLUDE_DIRS}")
 endif()
 
@@ -114,10 +114,6 @@ if (NOT USE_STATIC_BOOST)
 	ADD_DEFINITIONS (-DBOOST_ALL_DYN_LINK)
 endif()
 
-if (USE_SYSTEM_DIAG_FONT)
-    ADD_DEFINITIONS(-DUSE_SYSTEM_DIAG_FONT)
-endif()
-
 IF (NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
 	ADD_COMPILE_OPTIONS (-O3) # Needed for precompiled headers to work
 endif()

src/core/diagnostics/osd_graph.cpp

@@ -66,14 +66,8 @@ sf::Font& get_default_font()
 {
     static sf::Font DEFAULT_FONT = []() {
         sf::Font font;
-#ifdef USE_SYSTEM_DIAG_FONT
-        if (!font.loadFromFile("/usr/share/fonts/truetype/liberation/LiberationMono-Regular.ttf"))
-            CASPAR_THROW_EXCEPTION(file_not_found() << msg_info(
-                                       "/usr/share/fonts/truetype/liberation/LiberationMono-Regular.ttf not found"));
-#else
-        if (!font.loadFromFile("LiberationMono-Regular.ttf"))
-            CASPAR_THROW_EXCEPTION(file_not_found() << msg_info("LiberationMono-Regular.ttf not found"));
-#endif
+        if (!font.loadFromFile(DIAG_FONT_PATH))
+            CASPAR_THROW_EXCEPTION(file_not_found() << msg_info(DIAG_FONT_PATH " not found"));
         return font;
     }();