msdfgen: Update to 1.12

[akien-mga]

Didn't test.

Added the new DistanceMapping.cpp to the build, but not the save-/export- helpers.

[bruvzg]

Adding EdgeHolder.h seems to fix build (at least on macOS), will check if it works tomorrow:

diff --git a/modules/text_server_adv/text_server_adv.cpp b/modules/text_server_adv/text_server_adv.cpp
index d163b9f232..aa97a4073d 100644
--- a/modules/text_server_adv/text_server_adv.cpp
+++ b/modules/text_server_adv/text_server_adv.cpp
@@ -69,6 +69,7 @@ using namespace godot;
 #ifdef _MSC_VER
 #pragma warning(disable : 4458)
 #endif
+#include <core/EdgeHolder.h>
 #include <core/ShapeDistanceFinder.h>
 #include <core/contour-combiners.h>
 #include <core/edge-selectors.h>

[akien-mga]

Yeah I was looking into this, it seems the API entry points are all over the place in this lib. There's msdfgen.h which includes almost everything but the few headers we end up having to include manually. Those seem to be internal / low-level headers but the high-level implementations implicitly require them without including them properly? I'm confused.

[bruvzg]

This might be some sort of build cache issue, not sure. But we do access some low level APIs to integrate processing with WorkerThreadPool.

[akien-mga]

They moved the EdgeHolder constructor implementation from the .cpp to the .h so I think it's expected we need the header now, it's just weird that whichever API we use that uses EdgeHolder internally doesn't include the file itself.

[bruvzg]

Tested it with few fonts, seems to be working fine.