[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

6 files changed, 19 insertions, 0 deletions

diff --git a/platform/android/config.cmake b/platform/android/config.cmake
index 47f894f7b9..c7609f1644 100644
--- a/platform/android/config.cmake
+++ b/platform/android/config.cmake
@@ -36,6 +36,7 @@ macro(mbgl_platform_core)
         PRIVATE platform/android/src/thread.cpp
         PRIVATE platform/default/string_stdlib.cpp
         PRIVATE platform/default/bidi.cpp
+        PRIVATE platform/default/local_glyph_rasterizer.cpp
         PRIVATE platform/default/thread_local.cpp
         PRIVATE platform/default/utf.cpp
 
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
diff --git a/platform/ios/config.cmake b/platform/ios/config.cmake
index c3db194988..3b99211299 100644
--- a/platform/ios/config.cmake
+++ b/platform/ios/config.cmake
@@ -32,6 +32,7 @@ macro(mbgl_platform_core)
         PRIVATE platform/darwin/src/nsthread.mm
         PRIVATE platform/darwin/src/string_nsstring.mm
         PRIVATE platform/default/bidi.cpp
+        PRIVATE platform/default/local_glyph_rasterizer.cpp
         PRIVATE platform/default/thread_local.cpp
         PRIVATE platform/default/utf.cpp
 
diff --git a/platform/linux/config.cmake b/platform/linux/config.cmake
index 47c4c68806..fddcf90278 100644
--- a/platform/linux/config.cmake
+++ b/platform/linux/config.cmake
@@ -51,6 +51,7 @@ macro(mbgl_platform_core)
         PRIVATE platform/default/string_stdlib.cpp
         PRIVATE platform/default/thread.cpp
         PRIVATE platform/default/bidi.cpp
+        PRIVATE platform/default/local_glyph_rasterizer.cpp
         PRIVATE platform/default/thread_local.cpp
         PRIVATE platform/default/utf.cpp
 
diff --git a/platform/macos/config.cmake b/platform/macos/config.cmake
index aca99f9b40..3e7f548bab 100644
--- a/platform/macos/config.cmake
+++ b/platform/macos/config.cmake
@@ -18,6 +18,7 @@ macro(mbgl_platform_core)
         PRIVATE platform/darwin/src/nsthread.mm
         PRIVATE platform/darwin/src/string_nsstring.mm
         PRIVATE platform/default/bidi.cpp
+        PRIVATE platform/default/local_glyph_rasterizer.cpp
         PRIVATE platform/default/thread_local.cpp
         PRIVATE platform/default/utf.cpp
 
diff --git a/platform/qt/config.cmake b/platform/qt/config.cmake
index a7fdbf3542..57e586d7c3 100644
--- a/platform/qt/config.cmake
+++ b/platform/qt/config.cmake
@@ -48,6 +48,8 @@ macro(mbgl_platform_core)
         target_sources(mbgl-core PRIVATE platform/qt/src/bidi.cpp)
     endif()
 
+    target_sources(mbgl-core PRIVATE platform/default/local_glyph_rasterizer.cpp)
+
 endmacro()