Add autocoloring to layer selector. Auto coloring feature now fully implemented. Fix #14

fills all layers with colors from a given color palette.

gds-render-gui.c

@@ -61,6 +61,7 @@ struct _GdsRenderGui {
 	GList *gds_libraries;
 	ActivityBar *activity_status_bar;
 	struct render_settings render_dialog_settings;
+	ColorPalette *palette;
 };
 
 G_DEFINE_TYPE(GdsRenderGui, gds_render_gui, G_TYPE_OBJECT)
@@ -239,6 +240,20 @@ end_destroy:
 	gtk_widget_destroy(open_dialog);
 }
 
+/**
+ * @brief Callback for auto coloring button
+ * @param button
+ * @param user
+ */
+static void on_auto_color_clicked(gpointer button, gpointer user)
+{
+	GdsRenderGui *self;
+	(void)button;
+
+	self = RENDERER_GUI(user);
+	layer_selector_auto_color_layers(self->layer_selector, self->palette, 1.0);
+}
+
 /**
  * @brief Convert button callback
  * @param button
@@ -445,6 +460,7 @@ static void gds_render_gui_dispose(GObject *gobject)
 	g_clear_object(&self->cell_tree_store);
 	g_clear_object(&self->cell_search_entry);
 	g_clear_object(&self->activity_status_bar);
+	g_clear_object(&self->palette);
 
 	if (self->main_window) {
 		g_signal_handlers_destroy(self->main_window);
@@ -488,6 +504,7 @@ static void gds_render_gui_init(GdsRenderGui *self)
 	GtkWidget *sort_up_button;
 	GtkWidget *sort_down_button;
 	GtkWidget *activity_bar_box;
+	GtkWidget *auto_color_button;
 
 	main_builder = gtk_builder_new_from_resource("/gui/main.glade");
 
@@ -538,19 +555,24 @@ static void gds_render_gui_init(GdsRenderGui *self)
 	g_signal_connect(GTK_WIDGET(self->main_window), "delete-event",
 			 G_CALLBACK(on_window_close), self);
 
-	g_object_unref(main_builder);
-
 	/* Create and apply ActivityBar */
 	self->activity_status_bar = activity_bar_new();
 	gtk_container_add(GTK_CONTAINER(activity_bar_box), GTK_WIDGET(self->activity_status_bar));
 	gtk_widget_show(GTK_WIDGET(self->activity_status_bar));
 
+	/* Create color palette */
+	self->palette = color_palette_new_from_resource("/data/color-palette.txt");
+	auto_color_button = GTK_WIDGET(gtk_builder_get_object(main_builder, "auto-color-button"));
+	g_signal_connect(auto_color_button, "clicked", G_CALLBACK(on_auto_color_clicked), self);
+
+
 	/* Set default conversion/rendering settings */
 	self->render_dialog_settings.scale = 1000;
 	self->render_dialog_settings.renderer = RENDERER_LATEX_TIKZ;
 	self->render_dialog_settings.tex_pdf_layers = FALSE;
 	self->render_dialog_settings.tex_standalone = FALSE;
 
+	g_object_unref(main_builder);
 
 	/* Reference all objects referenced by this object */
 	g_object_ref(self->activity_status_bar);
@@ -560,6 +582,7 @@ static void gds_render_gui_init(GdsRenderGui *self)
 	g_object_ref(self->layer_selector);
 	g_object_ref(self->cell_tree_store);
 	g_object_ref(self->cell_search_entry);
+	g_object_ref(self->palette);
 }
 
 GdsRenderGui *gds_render_gui_new()

include/gds-render/layer/layer-selector.h

@@ -33,6 +33,7 @@
 
 #include <gtk/gtk.h>
 #include <glib.h>
+#include <gds-render/layer/color-palette.h>
 
 G_BEGIN_DECLS
 
@@ -90,6 +91,14 @@ GList *layer_selector_export_rendered_layer_info(LayerSelector *selector);
  */
 void layer_selector_force_sort(LayerSelector *selector, enum layer_selector_sort_algo sort_function);
 
+/**
+ * @brief Apply colors from palette to all layers. Aditionally set alpha
+ * @param layer_selector LayerSelector object
+ * @param palette Color palette to use
+ * @param global_alpha Additional alpha value that is applied to all layers
+ */
+void layer_selector_auto_color_layers(LayerSelector *layer_selector, ColorPalette *palette, double global_alpha);
+
 G_END_DECLS
 
 #endif /* __LAYER_SELECTOR_H__ */

layer/color-palette.c

@@ -40,6 +40,40 @@ struct _ColorPalette {
 
 G_DEFINE_TYPE(ColorPalette, color_palette, G_TYPE_OBJECT)
 
+/**
+ * @brief Return the number of non empty lines in array
+ *
+ * This function returns the number of non empty lines in an
+ * array. The scanning is either terminated by the given length
+ * or if a \0 terminator is found.
+ *
+ * @param[in] data Array to count lines in
+ * @param[in] length Length of \p data
+ * @return < 0: Error, >=0: Lines
+ */
+static int count_non_empty_lines_in_array(const char *data, size_t length)
+{
+	unsigned int idx;
+	int non_empty_lines;
+	char last_char = '\n';
+
+	if (!data)
+		return -1;
+
+	/* Count each '\n' as a new line if it is not directly preceded by another '\n' */
+	for (idx = 0; idx < length && data[idx]; idx++) {
+		if (data[idx] == '\n' && last_char != '\n')
+			non_empty_lines++;
+		last_char = data[idx];
+	}
+
+	/* Count the last line in case the data does not end with a '\n' */
+	if (data[idx-1] != '\n')
+		non_empty_lines++;
+
+	return non_empty_lines;
+}
+
 /**
  * @brief color_palette_fill_with_resource
  * @param palette
@@ -49,8 +83,16 @@ G_DEFINE_TYPE(ColorPalette, color_palette, G_TYPE_OBJECT)
 static int color_palette_fill_with_resource(ColorPalette *palette, char *resource_name)
 {
 	GBytes *data;
+	char line[10];
+	int line_idx;
+	unsigned int color_idx;
+	int idx;
 	const char *char_array;
 	gsize byte_count;
+	int lines;
+	GRegex *regex;
+	GMatchInfo *mi;
+	char *match;
 
 	if (!palette || !resource_name)
 		return -1;
@@ -65,9 +107,75 @@ static int color_palette_fill_with_resource(ColorPalette *palette, char *resourc
 	if (!char_array || !byte_count)
 		goto ret_unref;
 
+	/* Get maximum lenght of color palette, assuming all entries are valid */
+	lines = count_non_empty_lines_in_array(char_array, byte_count);
+
+	if (lines <= 0)
+		goto ret_unref;
+
+	palette->color_array = (GdkRGBA *)malloc(sizeof(GdkRGBA) * (unsigned int)lines);
+
+	/* Setup regex for hexadecimal RGB colors like 'A0CB3F' */
+	regex = g_regex_new("^(?<red>[0-9A-Fa-f][0-9A-Fa-f])(?<green>[0-9A-Fa-f][0-9A-Fa-f])(?<blue>[0-9A-Fa-f][0-9A-Fa-f])$", 0, 0, NULL);
 
 
+	/* Reset line */
+	line_idx = 0;
+	line[0] = '\0';
 
+	/* Set color index */
+	color_idx = 0;
+
+	/* interate over lines and match */
+	for (idx = 0 ; idx < byte_count; idx++) {
+		/* Fillup line. */
+		line[line_idx] = char_array[idx];
+
+
+		/* If end of line/string is reached, process */
+		if (line[line_idx] == '\n' || line[line_idx] == '\0') {
+			line[line_idx] = '\0';
+
+			/* Match the line */
+			g_regex_match(regex, line, 0, &mi);
+			if (g_match_info_matches(mi) && color_idx < lines) {
+				match = g_match_info_fetch_named(mi, "red");
+				palette->color_array[color_idx].red = (double)g_ascii_strtoll(match, NULL, 16) / 255.0;
+				g_free(match);
+				match = g_match_info_fetch_named(mi, "green");
+				palette->color_array[color_idx].green = (double)g_ascii_strtoll(match, NULL, 16) / 255.0;
+				g_free(match);
+				match = g_match_info_fetch_named(mi, "blue");
+				palette->color_array[color_idx].blue = (double)g_ascii_strtoll(match, NULL, 16) / 255.0;
+				g_free(match);
+
+				/* Only RGB supported so far. Fix alpha channel to 1.0 */
+				palette->color_array[color_idx].alpha = 1.0;
+
+				color_idx++;
+			}
+
+			g_match_info_free(mi);
+
+			/* End of string */
+			if (char_array[idx] == '\0')
+				break;
+
+			line_idx = 0;
+			continue;
+		}
+
+		/* increment line index. If end is reached write all bytes  to the line end
+		 * line is longer than required for parsing. This ensures, that everything works as expected
+		 */
+		line_idx += (line_idx < sizeof(line)-1 ? 1 : 0);
+	}
+
+	/* Data read; Shrink array in case of invalid lines */
+	palette->color_array = realloc(palette->color_array, (size_t)color_idx * sizeof(GdkRGBA));
+	palette->color_array_length = color_idx;
+
+	g_regex_unref(regex);
 ret_unref:
 	g_bytes_unref(data);
 

layer/layer-selector.c

@@ -781,4 +781,44 @@ void layer_selector_force_sort(LayerSelector *selector, enum layer_selector_sort
 	gtk_list_box_set_sort_func(box, NULL, NULL, NULL);
 }
 
+void layer_selector_auto_color_layers(LayerSelector *layer_selector, ColorPalette *palette, double global_alpha)
+{
+	GList *le_list;
+	GList *le_list_ptr;
+	LayerElement *le;
+	unsigned int color_index = 0;
+	unsigned int color_count;
+	GdkRGBA color;
+
+	if (GDS_RENDER_IS_COLOR_PALETTE(palette) == FALSE || LAYER_IS_SELECTOR(layer_selector) == FALSE)
+		return;
+	if (global_alpha <= 0)
+		return;
+	if (GTK_IS_LIST_BOX(layer_selector->list_box) == FALSE)
+		return;
+
+	le_list = gtk_container_get_children(GTK_CONTAINER(layer_selector->list_box));
+
+	/* iterate over layer elements and fill colors */
+	color_index = 0;
+	color_count = color_palette_get_color_count(palette);
+	if (color_count == 0)
+		goto ret_free_le_list;
+
+	for (le_list_ptr = le_list; le_list_ptr != NULL; le_list_ptr = le_list_ptr->next) {
+		le = LAYER_ELEMENT(le_list_ptr->data);
+		if (le) {
+			color_palette_get_color(palette, &color, color_index++);
+			color.alpha *= global_alpha;
+			layer_element_set_color(le, &color);
+
+			if (color_index >= color_count)
+				color_index = 0;
+		}
+	}
+
+ret_free_le_list:
+	g_list_free(le_list);
+}
+
 /** @} */