Add vertex simplification to parser

* Duplicate / Redundant vertices of polygons are now removed during parsing.
* Implications: Reduced output size of tex document, faster rendering.

include/gds-render/gds-utils/gds-parser.h

@@ -35,7 +35,7 @@
 
 #include <gds-render/gds-utils/gds-types.h>
 
-#define GDS_PRINT_DEBUG_INFOS (0) /**< @brief 1: Print infos, 0: Don't print */
+#define GDS_PRINT_DEBUG_INFOS (1) /**< @brief 1: Print infos, 0: Don't print */
 
 /**
  * @brief Parse a GDS file
@@ -48,9 +48,11 @@
  *
  * @param[in] filename Path to the GDS file
  * @param[in,out] library_array GList Pointer.
+ * @param[in] parsing_options Parsing options.
  * @return 0 if successful
  */
-int parse_gds_from_file(const char *filename, GList **library_array);
+int parse_gds_from_file(const char *filename, GList **library_array,
+                        const struct gds_library_parsing_opts *parsing_options);
 
 /**
  * @brief Deletes all libraries including cells, references etc.

include/gds-render/gds-utils/gds-types.h

@@ -129,6 +129,13 @@ struct gds_cell {
 	struct gds_cell_checks checks; /**< @brief Checking results */
 };
 
+/**
+ * @brief Options, hwo this liobrary was parsed.
+ */
+struct gds_library_parsing_opts {
+    int simplified_polygons; /**< @brief Polygons have been simplified. Coincident end point removed. */
+};
+
 /**
  * @brief GDS Toplevel library
  */
@@ -136,6 +143,7 @@ struct gds_library {
 	char name[CELL_NAME_MAX];
 	struct gds_time_field mod_time;
 	struct gds_time_field access_time;
+    struct gds_library_parsing_opts parsing_opts;
 	double unit_in_meters;  /**< Length of a database unit in meters */
 	GList *cells; /**< List of #gds_cell that contains all cells in this library*/
 	GList *cell_names /**< List of strings that contains all cell names */;