Add support for external shared object renderer

CMakeLists.txt

@@ -19,7 +19,7 @@ aux_source_directory("gds-parser" PARSER_SOURCES)
 aux_source_directory("latex-output" LATEX_SOURCES)
 aux_source_directory("cairo-output" CAIRO_SOURCES)
 aux_source_directory("trigonometric" TRIG_SOURCES)
-set(SOURCE "main.c" "layer-selector.c" "mapping-parser.c" "command-line.c" "main-window.c")
+set(SOURCE "main.c" "layer-selector.c" "mapping-parser.c" "command-line.c" "main-window.c" "external-renderer.c")
 
 set(SOURCE
   ${SOURCE}
@@ -36,6 +36,6 @@ add_compile_options(-Wall)
 add_executable(${PROJECT_NAME} ${SOURCE} ${CMAKE_CURRENT_BINARY_DIR}/glade/resources.c)
 add_dependencies(${PROJECT_NAME} glib-resources)
 SET_SOURCE_FILES_PROPERTIES(${CMAKE_CURRENT_BINARY_DIR}/glade/resources.c PROPERTIES GENERATED 1)
-target_link_libraries(${PROJECT_NAME} ${GLIB_LDFLAGS} ${GTK3_LDFLAGS} ${CAIRO_LDFLAGS} m)
+target_link_libraries(${PROJECT_NAME} ${GLIB_LDFLAGS} ${GTK3_LDFLAGS} ${CAIRO_LDFLAGS} m ${CMAKE_DL_LIBS})
 install (TARGETS ${PROJECT_NAME} DESTINATION bin)
 

command-line.c

@@ -34,6 +34,7 @@
 #include "mapping-parser.h"
 #include "cairo-output/cairo-output.h"
 #include "latex-output/latex-output.h"
+#include "external-renderer.h"
 
 /**
  * @brief Delete layer_info and free nem element.
@@ -52,7 +53,7 @@ static void delete_layer_info_with_name(struct layer_info *info)
 
 void command_line_convert_gds(char *gds_name, char *pdf_name, char *tex_name, gboolean pdf, gboolean tex,
 			      char *layer_file, char *cell_name, double scale, gboolean pdf_layers,
-			      gboolean pdf_standalone, gboolean svg, char *svg_name)
+			      gboolean pdf_standalone, gboolean svg, char *svg_name, char *so_name, char *so_out_file)
 {
 	GList *libs = NULL;
 	FILE *tex_file;
@@ -71,7 +72,7 @@ void command_line_convert_gds(char *gds_name, char *pdf_name, char *tex_name, gb
 	struct gds_cell *toplevel_cell = NULL, *temp_cell;
 
 	/* Check if parameters are valid */
-	if (!gds_name || ! pdf_name || !tex_name || !layer_file || !cell_name) {
+	if (!gds_name || (!pdf_name && pdf)  || (!tex_name && tex) || !layer_file || !cell_name) {
 		printf("Probably missing argument. Check --help option\n");
 		return;
 	}
@@ -144,6 +145,16 @@ void command_line_convert_gds(char *gds_name, char *pdf_name, char *tex_name, gb
 		fclose(tex_file);
 	}
 
+	if (so_name && so_out_file) {
+		if (strlen(so_name) == 0 || strlen(so_out_file) == 0)
+			goto ret_clear_list;
+
+		/* Render output using external renderer */
+		printf("Invoking external renderer!\n");
+		external_renderer_render_cell(toplevel_cell, layer_info_list, so_out_file, so_name);
+		printf("External renderer finished!\n");
+	}
+
 ret_clear_list:
 	g_list_free_full(layer_info_list, (GDestroyNotify)delete_layer_info_with_name);
 

command-line.h

@@ -45,11 +45,13 @@
  * @param pdf_layers TikZ creates OCG layers
  * @param pdf_standalone LaTeX document is standalone7
  * @param svg Render to SVG file
+ * @param so_name Path to shared object of custom renderer
+ * @param so_out_file Output file path for custom renderer
  * @param svg_name SVG file name
  */
 void command_line_convert_gds(char *gds_name, char *pdf_name, char *tex_name, gboolean pdf, gboolean tex,
 			      char *layer_file, char *cell_name, double scale, gboolean pdf_layers,
-			      gboolean pdf_standalone, gboolean svg, char *svg_name);
+			      gboolean pdf_standalone, gboolean svg, char *svg_name, char *so_name, char *so_out_file);
 
 #endif /* _COMMAND_LINE_H_ */
 

external-renderer.c

@@ -0,0 +1,70 @@
+/*
+ * GDSII-Converter
+ * Copyright (C) 2018  Mario Hüttel <mario.huettel@gmx.net>
+ *
+ * This file is part of GDSII-Converter.
+ *
+ * GDSII-Converter is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * GDSII-Converter is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GDSII-Converter.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @file external-renderer.c
+ * @brief This file implements the dynamic library loading for the external rendering feature
+ * @author Mario Hüttel <mario.huettel@gmx.net>
+ */
+
+/**
+ * @addtogroup MainApplication
+ * @{
+ */
+
+#include "external-renderer.h"
+#include <dlfcn.h>
+#include <stdio.h>
+
+int external_renderer_render_cell(struct gds_cell *toplevel_cell, GList *layer_info_list, char *output_file, char *so_path)
+{
+	int (*so_render_func)(struct gds_cell *, GList *, char *) = NULL;
+	void *so_handle = NULL;
+	char *error_msg;
+	int ret = 0;
+
+	/* Check parameter sanity */
+	if (!output_file || !so_path || !toplevel_cell || !layer_info_list) {
+		return -3000;
+	}
+
+	/* Load shared object */
+	so_handle = dlopen(so_path, RTLD_LAZY);
+	if (!so_handle) {
+		printf("Could not load external library '%s'\nDetailed error is:\n%s\n", so_path, dlerror());
+		return -2000;
+	}
+
+	/* Load symbol from library */
+	so_render_func = (int (*)(struct gds_cell *, GList *, char *))dlsym(so_handle, EXTERNAL_LIBRARY_FUNCTION);
+	if ((error_msg = dlerror()) != NULL) {
+		printf("Rendering function not found in library:\n%s\n", error_msg);
+		goto ret_close_so_handle;
+	}
+
+	/* Execute */
+	if (so_render_func)
+		so_render_func(toplevel_cell, layer_info_list, output_file);
+
+ret_close_so_handle:
+	dlclose(so_handle);
+	return ret;
+}
+
+/** @} */

external-renderer.h

@@ -0,0 +1,58 @@
+/*
+ * GDSII-Converter
+ * Copyright (C) 2018  Mario Hüttel <mario.huettel@gmx.net>
+ *
+ * This file is part of GDSII-Converter.
+ *
+ * GDSII-Converter is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * GDSII-Converter is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GDSII-Converter.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @file command-line.c
+ * @brief Render according to command line parameters
+ * @author Mario Hüttel <mario.huettel@gmx.net>
+ */
+
+/**
+ * @addtogroup MainApplication
+ * @{
+ */
+
+#ifndef _EXTERNAL_RENDERER_H_
+#define _EXTERNAL_RENDERER_H_
+
+#include "gds-parser/gds-types.h"
+#include <glib.h>
+
+/**
+ * @brief function name expected to be found in external library.
+ * @detail The function has to be defined as follows:
+ * @code
+ * int function_name(gds_cell *toplevel, GList *layer_info_list, char *output_file_name)
+ * @endcode
+ */
+#define EXTERNAL_LIBRARY_FUNCTION "render_cell_to_file"
+
+/**
+ * @brief external_renderer_render_cell
+ * @param toplevel_cell The toplevel cell to render
+ * @param layer_info_list The layer information. Contains #layer_info elements
+ * @param output_file Output file
+ * @param so_path Path to the shared object file containing #EXTERNAL_LIBRARY_FUNCTION
+ * @return 0 on success
+ */
+int external_renderer_render_cell(struct gds_cell *toplevel_cell, GList *layer_info_list, char *output_file, char *so_path);
+
+#endif /* _EXTERNAL_RENDERER_H_ */
+
+/** @} */

main.c

@@ -22,6 +22,7 @@
 #include <glib.h>
 #include "main-window.h"
 #include "command-line.h"
+#include "external-renderer.h"
 
 struct application_data {
 	GtkApplication *app;
@@ -116,6 +117,8 @@ int main(int argc, char **argv)
 	gchar *basename;
 	gchar *pdfname = NULL, *texname = NULL, *mappingname = NULL, *cellname = NULL, *svgname = NULL;
 	gboolean tikz = FALSE, pdf = FALSE, pdf_layers = FALSE, pdf_standalone = FALSE, svg = FALSE;
+	gchar *custom_library_path = NULL;
+	gchar *custom_library_file_name = NULL;
 	int scale = 1000;
 	int app_status;
 
@@ -132,6 +135,8 @@ int main(int argc, char **argv)
 	  {"cell", 'c', 0, G_OPTION_ARG_STRING, &cellname, "Cell to render", "NAME" },
 	  {"tex-standalone", 'a', 0, G_OPTION_ARG_NONE, &pdf_standalone, "Create standalone PDF", NULL },
 	  {"tex-layers", 'l', 0, G_OPTION_ARG_NONE, &pdf_layers, "Create PDF Layers (OCG)", NULL },
+	  {"custom-render-lib", 'P', 0, G_OPTION_ARG_FILENAME, &custom_library_path, "Path to a custom shared object, that implements the " EXTERNAL_LIBRARY_FUNCTION " function", "PATH"},
+	  {"external-lib-output", 'e', 0, G_OPTION_ARG_FILENAME, &custom_library_file_name, "Output path for external render library", "PATH"},
 	  { NULL }
 	};
 
@@ -171,7 +176,8 @@ int main(int argc, char **argv)
 
 		command_line_convert_gds(gds_name, pdfname, texname, pdf, tikz,
 					mappingname, cellname, (double)scale,
-					pdf_layers, pdf_standalone, svg, svgname);
+					pdf_layers, pdf_standalone, svg, svgname,
+					custom_library_path, custom_library_file_name);
 		/* Clean up */
 		g_free(pdfname);
 		g_free(texname);