[core] Enable local glyph generation using TinySDF.

 - Platform-specific LocalGlyphRasterizer is responsible for deciding which glyphs to rasterize locally and for implementing the rasterization.
 - Default platform implementation doesn't locally generate any glyphs -> no behavior change
 - Unit test uses StubLocalGlyphRasterizer, which returns a single fixed bitmap for all CJK glyphs
 - Rename glyph_loader.test to glyph_manager.test

1 files changed, 13 insertions, 0 deletions

diff --git a/platform/default/local_glyph_rasterizer.cpp b/platform/default/local_glyph_rasterizer.cpp
new file mode 100644
index 0000000000..7ace6cbfb1
--- /dev/null
+++ b/platform/default/local_glyph_rasterizer.cpp
@@ -0,0 +1,13 @@
+#include <mbgl/text/local_glyph_rasterizer.hpp>
+
+namespace mbgl {
+
+bool LocalGlyphRasterizer::canRasterizeGlyph(const FontStack&, GlyphID) {
+    return false;
+}
+
+Glyph LocalGlyphRasterizer::rasterizeGlyph(const FontStack&, GlyphID) {
+    return Glyph();
+}
+
+} // namespace mbgl