Fix T66452: Convert Curve to Grease Pencil Strokes

This commit adds support to convert curves to Grease Pencil strokes and create the materials too.

Also, there is a new python API. This API is required by the modified SVG import addon to create strokes( see T67065).

All curves selected in one operation are converted in the same Grease Pencil object.

1 files changed, 39 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_object_api.c b/source/blender/makesrna/intern/rna_object_api.c
index d3bdfde86ce..5bec6f0c7d3 100644
--- a/source/blender/makesrna/intern/rna_object_api.c
+++ b/source/blender/makesrna/intern/rna_object_api.c
@@ -37,6 +37,7 @@
 #include "DNA_object_types.h"
 
 #include "BKE_layer.h"
+#include "BKE_gpencil.h"
 
 #include "DEG_depsgraph.h"
 
@@ -685,6 +686,30 @@ static bool rna_Object_update_from_editmode(Object *ob, Main *bmain)
   }
   return result;
 }
+
+bool rna_Object_generate_gpencil_strokes(Object *ob,
+                                         bContext *C,
+                                         ReportList *reports,
+                                         Object *ob_gpencil,
+                                         bool gpencil_lines,
+                                         bool use_collections)
+{
+  if (ob->type != OB_CURVE) {
+    BKE_reportf(reports,
+                RPT_ERROR,
+                "Object '%s' not valid for this operation! Only curves supported.",
+                ob->id.name + 2);
+    return false;
+  }
+  Main *bmain = CTX_data_main(C);
+  Scene *scene = CTX_data_scene(C);
+
+  BKE_gpencil_convert_curve(bmain, scene, ob_gpencil, ob, gpencil_lines, use_collections, false);
+
+  WM_main_add_notifier(NC_GPENCIL | ND_DATA, NULL);
+
+  return true;
+}
 #else /* RNA_RUNTIME */
 
 void RNA_api_object(StructRNA *srna)
@@ -1128,6 +1153,20 @@ void RNA_api_object(StructRNA *srna)
   RNA_def_function_ui_description(func,
                                   "Release memory used by caches associated with this object. "
                                   "Intended to be used by render engines only");
+
+  /* Convert curve object to gpencil strokes. */
+  func = RNA_def_function(srna, "generate_gpencil_strokes", "rna_Object_generate_gpencil_strokes");
+  RNA_def_function_ui_description(func, "Convert a curve object to grease pencil strokes.");
+  RNA_def_function_flag(func, FUNC_USE_CONTEXT | FUNC_USE_REPORTS);
+
+  parm = RNA_def_pointer(
+      func, "ob_gpencil", "Object", "", "Grease Pencil object used to create new strokes");
+  RNA_def_parameter_flags(parm, PROP_NEVER_NULL, PARM_REQUIRED);
+  parm = RNA_def_boolean(func, "gpencil_lines", 0, "", "Create Lines");
+  parm = RNA_def_boolean(func, "use_collections", 1, "", "Use Collections");
+
+  parm = RNA_def_boolean(func, "result", 0, "", "Result");
+  RNA_def_function_return(func, parm);
 }
 
 #endif /* RNA_RUNTIME */