1 files changed, 63 insertions, 0 deletions
diff --git a/contrib/python/contourpy/src/converter.h b/contrib/python/contourpy/src/converter.h
new file mode 100644
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+++ b/contrib/python/contourpy/src/converter.h
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+#ifndef CONTOURPY_CONVERTER_H
+#define CONTOURPY_CONVERTER_H
+
+#include "common.h"
+
+namespace contourpy {
+
+// Conversion of C++ point/code/offset array to return to Python as a NumPy array.
+// There are two versions of each function, the first creates, populates and returns a NumPy array
+// whereas the second populates one that has already been created. The former are used in serial
+// code and the latter in threaded code where the creation and manipulation of NumPy arrays needs to
+// be threadlocked whereas the population of those arrays does not.
+class Converter
+{
+public:
+    // Create and populate codes array,
+    static CodeArray convert_codes(
+        count_t point_count, count_t cut_count, const offset_t* cut_start, offset_t subtract);
+
+    // Populate codes array that has already been created.
+    static void convert_codes(
+        count_t point_count, count_t cut_count, const offset_t* cut_start, offset_t subtract,
+        CodeArray::value_type* codes);
+
+    // Create and populate codes array,
+    static CodeArray convert_codes_check_closed(
+        count_t point_count, count_t cut_count, const offset_t* cut_start, const double* points);
+
+    // Populate codes array that has already been created.
+    static void convert_codes_check_closed(
+        count_t point_count, count_t cut_count, const offset_t* cut_start, const double* points,
+        CodeArray::value_type* codes);
+
+    // Create and populate codes array (single line loop/strip).
+    static CodeArray convert_codes_check_closed_single(
+        count_t point_count, const double* points);
+
+    // Populate codes array that has already been created (single line loop/strip).
+    static void convert_codes_check_closed_single(
+        count_t point_count, const double* points, CodeArray::value_type* codes);
+
+    // Create and populate offsets array,
+    static OffsetArray convert_offsets(
+        count_t offset_count, const offset_t* start, offset_t subtract);
+
+    // Populate offsets array that has already been created.
+    static void convert_offsets(
+        count_t offset_count, const offset_t* start, offset_t subtract,
+        OffsetArray::value_type* offsets);
+
+    // Create and populate points array,
+    static PointArray convert_points(count_t point_count, const double* start);
+
+    // Populate points array that has already been created.
+    static void convert_points(count_t point_count, const double* start, double* points);
+
+private:
+    static void check_max_offset(count_t max_offset);
+};
+
+} // namespace contourpy
+
+#endif // CONTOURPY_CONVERTER_H