Add base_segmentation_plan to segmenter config.

Allows the config to provide segmentation plan settings to include in the output plan.

Author: garretrieger

util/BUILD

@@ -42,6 +42,7 @@ proto_library(
         "//visibility:public",
     ],
     deps = [
+        ":segmentation_plan_proto",
         ":common_proto",
     ],
 )

util/closure_glyph_keyed_segmenter_util.cc

@@ -193,12 +193,15 @@ static Status Main(const std::vector<char*> args) {
       AddTableKeyedSegments(plan, merge_groups, segments, init_segment);
     }
 
+    SegmentationPlan combined = config.base_segmentation_plan();
+    combined.MergeFrom(plan);
+
     // TODO(garretrieger): assign a basic (single segment) table keyed config.
     // Later on the input to this util should include information on how the
     // segments should be grouped together for the table keyed portion of the
     // font.
     std::string config_string;
-    TextFormat::PrintToString(plan, &config_string);
+    TextFormat::PrintToString(combined, &config_string);
     std::cout << config_string;
   } else {
     // No config requested, just output a simplified plain text representation

util/segmenter_config.proto

@@ -1,5 +1,6 @@
 edition = "2023";
 
+import "util/segmentation_plan.proto";
 import "util/common.proto";
 
 // This messages provides the configuration details for closure_glyph_keyed_segmenter_util
@@ -100,6 +101,9 @@ message SegmenterConfig {
   // Any segments that are not covered by any merge group will not be merged.
   // Merge groups are not required to be disjoint and may have overlapping segments.
   repeated MergeGroup merge_groups = 12;
+
+  // When provide the generated segmentation plan will be merged onto this base plan.
+  SegmentationPlan base_segmentation_plan = 13;
 }
 
 // For a given set of segments this configures how merging will be performed. Each merge group