fix/enhancement:graphics/layout:get default icon size from layout + draw tunnels transparent + mark oneway streets (#884)

This pull request adds the possibility to globally set a default for icon size of a layout.
You can now give "icon_h" and "icon_w" properties in "layout" tag. This causes navit to not use the real size of an icon but to scale it to have the requested size. Guessing prescaled icons (the name_w_h.png's of course works. Default size of 22x22px which is the default size hint on most of the svg's is used. This fixes #819.

This pull request adds the property "underground_alpha" to the "graphics" tag giving the alpha value to use as transparency if ways are flagged with AF_UNDERGROUND. This effectively renders tunnels in transparent.

This pull request adds a "oneway" tag to itemgras in layouts. Together with the enhancements of the "arrows" itemgra used for drawing the route graph one can print nice arrows on oneway roads.

1 files changed, 7 insertions, 0 deletions

diff --git a/navit/layout.h b/navit/layout.h
index 700e6245a..8b8a63194 100644
--- a/navit/layout.h
+++ b/navit/layout.h
@@ -37,6 +37,7 @@ struct element {
     enum { element_point, element_polyline, element_polygon, element_circle, element_text, element_icon, element_image, element_arrows } type;
     struct color color;
     int text_size;
+    int oneway;
     union {
         struct element_point {
             char stub;
@@ -67,6 +68,9 @@ struct element {
         struct element_text {
             struct color background_color;
         } text;
+        struct element_arrows {
+            int width;
+        } arrows;
     } u;
     int coord_count;
     struct coord *coord;
@@ -105,6 +109,9 @@ struct layout {
     char* nightname;
     char *font;
     struct color color;
+    int underground_alpha;
+    int icon_w;
+    int icon_h;
     GList *layers;
     GList *cursors;
     int order_delta;