feat: implemented multiple new fonts

engine/CMakeLists.txt

@@ -63,6 +63,15 @@ if(PDFENGINE_WITH_PDFIUM)
     target_compile_definitions(pdfengine PRIVATE PDFENGINE_WITH_PDFIUM)
 endif()
 
+# Directory of the bundled fallback fonts (Carlito/Tinos). Under WASM they're embedded into the
+# module's in-memory FS at /fonts (see wasm/CMakeLists.txt --embed-file); natively the engine reads
+# them straight from the source assets dir. font_fallback.cpp prefers these over OS fonts.
+if(EMSCRIPTEN)
+    target_compile_definitions(pdfengine PRIVATE PDFENGINE_FONT_DIR="/fonts")
+else()
+    target_compile_definitions(pdfengine PRIVATE PDFENGINE_FONT_DIR="${CMAKE_SOURCE_DIR}/engine/assets/fonts")
+endif()
+
 if(PDFENGINE_WITH_SKIA)
     target_link_libraries(pdfengine PRIVATE skia::skia)
     target_compile_definitions(pdfengine PUBLIC PDFENGINE_WITH_SKIA)