Add option to specify layer order, wrote tex output for layer order

latex-output/latex-output.c

@@ -19,7 +19,75 @@
 
 #include "latex-output.h"
 
+#define WRITEOUT_BUFFER(buff) fwrite((buff)->str, sizeof(char), (buff)->len, tex_file)
+
+static void write_layer_definitions(FILE *tex_file, GList *layer_infos, GString *buffer)
+{
+	GList *list;
+	struct layer_info *lifo;
+	char *end_str;
+
+	for (list = layer_infos; list != NULL; list = list->next) {
+		lifo = (struct layer_info *)list->data;
+		g_string_printf(buffer, "\\pgfdeclarelayer{l%d}\n", lifo->layer);
+		WRITEOUT_BUFFER(buffer);
+	}
+
+	g_string_printf(buffer, "\\pgfsetlayers{");
+	WRITEOUT_BUFFER(buffer);
+
+	for (list = layer_infos; list != NULL; list = list->next) {
+		lifo = (struct layer_info *)list->data;
+
+		if (list->next == NULL)
+			end_str = ",main}";
+		else
+			end_str = ",";
+		g_string_printf(buffer, "l%d%s", lifo->layer, end_str);
+		WRITEOUT_BUFFER(buffer);
+	}
+	fwrite("\n", sizeof(char), 1, tex_file);
+}
+
+static int sorting_func_stack(struct layer_info *info1, struct layer_info *info2)
+{
+	return info1->stacked_position - info2->stacked_position;
+}
+
+static void sort_layers_for_rendering(GList **layer_infos)
+{
+	GList *list = *layer_infos;
+	list = g_list_sort(list, (GCompareFunc)sorting_func_stack);
+	*layer_infos = list;
+}
+
 void render_cell_to_code(struct gds_cell *cell, GList *layer_infos, FILE *tex_file)
 {
+	GString *working_line;
 
+	if (!tex_file || !layer_infos || !cell)
+		return;
+
+	/* 10 kB Line working buffer should be enough */
+	working_line = g_string_new_len(NULL, LATEX_LINE_BUFFER_KB*1024);
+
+	/* Sort layer according to target layer */
+	sort_layers_for_rendering(&layer_infos);
+
+	/* Write layer definitions */
+	write_layer_definitions(tex_file, layer_infos, working_line);
+
+	/* Open tikz Pictute */
+	g_string_printf(working_line, "\\begin{tikzpicture}\n");
+	WRITEOUT_BUFFER(working_line);
+
+	/* Generate graphics output */
+
+
+
+	g_string_printf(working_line, "\\end{tikzpicture}\n");
+	WRITEOUT_BUFFER(working_line);
+
+	fflush(tex_file);
+	g_string_free(working_line, TRUE);
 }

latex-output/latex-output.h

@@ -23,6 +23,9 @@
 #include "../gds-parser/gds-types.h"
 #include <glib.h>
 #include <stdio.h>
+#include "../layer-selector.h"
+
+#define LATEX_LINE_BUFFER_KB (10)
 
 void render_cell_to_code(struct gds_cell *cell, GList *layer_infos, FILE *tex_file);