From 279b26242c5d635c89fb44eeb6784ad0ec58f46f Mon Sep 17 00:00:00 2001
From: Just van Rossum <justvanrossum@gmail.com>
Date: Mon, 21 Oct 2024 09:35:36 +0200
Subject: [PATCH] Add flag to add minimal gasp table

---
 src/fontra_compile/compile_fontmake_action.py | 21 +++++++++++++++++++
 tests/data/MutatorSans-fontmake.ttx           |  4 ++++
 tests/test_workflow.py                        |  1 +
 3 files changed, 26 insertions(+)

diff --git a/src/fontra_compile/compile_fontmake_action.py b/src/fontra_compile/compile_fontmake_action.py
index 9fd5c05..0e3493b 100644
--- a/src/fontra_compile/compile_fontmake_action.py
+++ b/src/fontra_compile/compile_fontmake_action.py
@@ -25,6 +25,7 @@ class CompileFontMakeAction:
     destination: str
     options: dict[str, str] = field(default_factory=dict)
     setOverlapSimpleFlag: bool = False
+    addMinimalGaspTable: bool = False
     ufoTempDir: str | None = None
     input: ReadableFontBackend | None = field(init=False, default=None)
 
@@ -81,6 +82,9 @@ async def process(
                 addInstances(sourcePath)
             addGlyphOrder(sourcePath)
 
+            if self.addMinimalGaspTable:
+                addMinimalGaspTable(sourcePath)
+
             extraArguments = []
             for option, value in self.options.items():
                 extraArguments.append(f"--{option}")
@@ -176,3 +180,20 @@ def addGlyphOrder(designspacePath):
         glyphSet = ufo.getGlyphSet()
         lib["public.glyphOrder"] = sorted(glyphSet.keys(), key=_glyphSortKeyFunc)
         ufo.writeLib(lib)
+
+
+class UFOFontInfo:
+    pass
+
+
+def addMinimalGaspTable(designspacePath):
+    backend = getFileSystemBackend(designspacePath)
+    dsDoc = backend.dsDoc
+    defaultSource = dsDoc.findDefault()
+    ufo = UFOReaderWriter(defaultSource.path)
+    fontInfo = UFOFontInfo()
+    ufo.readInfo(fontInfo)
+    fontInfo.openTypeGaspRangeRecords = [
+        {"rangeMaxPPEM": 0xFFFF, "rangeGaspBehavior": [0, 1, 2, 3]}
+    ]
+    ufo.writeInfo(fontInfo)
diff --git a/tests/data/MutatorSans-fontmake.ttx b/tests/data/MutatorSans-fontmake.ttx
index fb78446..98dd314 100644
--- a/tests/data/MutatorSans-fontmake.ttx
+++ b/tests/data/MutatorSans-fontmake.ttx
@@ -1829,6 +1829,10 @@
     </extraNames>
   </post>
 
+  <gasp>
+    <gaspRange rangeMaxPPEM="65535" rangeGaspBehavior="15"/>
+  </gasp>
+
   <HVAR>
     <Version value="0x00010000"/>
     <VarStore Format="1">
diff --git a/tests/test_workflow.py b/tests/test_workflow.py
index 5994cd3..ba93e6a 100644
--- a/tests/test_workflow.py
+++ b/tests/test_workflow.py
@@ -95,6 +95,7 @@ async def processGlyph(self, glyph: VariableGlyph) -> VariableGlyph:
   options:
     flatten-components:  # no value
   destination: "output-fontmake.ttf"
+  addMinimalGaspTable: true
 """,
         "MutatorSans-fontmake.ttx",
     ),