[gpxview] Diff of /trunk/src/osm-gps-map-osd-classic.c

Diff of /trunk/src/osm-gps-map-osd-classic.c

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-revision 73 by harbaum,
Sun Aug 23 19:38:15 2009 UTC
+revision 131 by harbaum,
Wed Sep 30 19:14:56 2009 UTC
 Line 19
  #include "config.h"
  #include <stdlib.h>  // abs
- #include <math.h>    // M_PI
+ #include <string.h>
+ #include <math.h>    // M_PI/cos()
  /* parameters that can be overwritten from the config file: */
- /* OSM_GPS_MAP_OSD_DIAMETER */
+ /* OSD_DIAMETER */
+ /* OSD_X, OSD_Y */
  #ifndef USE_CAIRO
  #error "OSD control display lacks a non-cairo implementation!"
-Line 31
+Line 33
  #include <cairo.h>
  #include "osm-gps-map.h"
+ #include "converter.h"
  #include "osm-gps-map-osd-classic.h"
  //the osd controls
  typedef struct {
-     GdkPixmap *backup;
+     /* the offscreen representation of the OSD */
-     gint backup_x, backup_y;
+     struct {
-     cairo_surface_t *overlay;
+         cairo_surface_t *surface;
+         gboolean rendered;
+ #ifdef OSD_GPS_BUTTON
+         gboolean gps_enabled;
+ #endif
+     } controls;
+ #ifdef OSD_BALLOON
+     //a balloon with additional info
+     struct {
+         cairo_surface_t *surface;
+         int orientation, offset_x, offset_y;
+         gboolean just_created;
+         float lat, lon;
+         OsmGpsMapRect_t rect;
+         /* function called to have the user app draw the contents */
+         OsmGpsMapBalloonCallback cb;
+         gpointer data;
+     } balloon;
+ #endif
+ #ifdef OSD_SCALE
+     struct {
+         cairo_surface_t *surface;
+         int zoom;
+     } scale;
+ #endif
+ #ifdef OSD_CROSSHAIR
+     struct {
+         cairo_surface_t *surface;
+         gboolean rendered;
+     } crosshair;
+ #endif
+ #ifdef OSD_NAV
+     struct {
+         cairo_surface_t *surface;
+         float lat, lon;
+         char *name;
+     } nav;
+ #endif
+ #ifdef OSD_COORDINATES
+     struct {
+         cairo_surface_t *surface;
+         float lat, lon;
+     } coordinates;
+ #endif
+ #ifdef OSD_SOURCE_SEL
+     struct {
+         /* values to handle the "source" menu */
+         cairo_surface_t *surface;
+         gboolean expanded;
+         gint shift, dir, count;
+         gint handler_id;
+         gint width, height;
+         gboolean rendered;
+     } source_sel;
+ #endif
  } osd_priv_t;
+ #ifdef OSD_BALLOON
+ /* most visual effects are hardcoded by now, but may be made */
+ /* available via properties later */
+ #ifndef BALLOON_AREA_WIDTH
+ #define BALLOON_AREA_WIDTH           290
+ #endif
+ #ifndef BALLOON_AREA_HEIGHT
+ #define BALLOON_AREA_HEIGHT           75
+ #endif
+ #ifndef BALLOON_CORNER_RADIUS
+ #define BALLOON_CORNER_RADIUS         10
+ #endif
+ #define BALLOON_BORDER               (BALLOON_CORNER_RADIUS/2)
+ #define BALLOON_WIDTH                (BALLOON_AREA_WIDTH + 2 * BALLOON_BORDER)
+ #define BALLOON_HEIGHT               (BALLOON_AREA_HEIGHT + 2 * BALLOON_BORDER)
+ #define BALLOON_TRANSPARENCY         0.8
+ #define POINTER_HEIGHT                20
+ #define POINTER_FOOT_WIDTH            20
+ #define POINTER_OFFSET               (BALLOON_CORNER_RADIUS*3/4)
+ #define BALLOON_SHADOW               (BALLOON_CORNER_RADIUS/2)
+ #define BALLOON_SHADOW_TRANSPARENCY  0.2
+ #define BALLOON_W  (BALLOON_WIDTH + BALLOON_SHADOW)
+ #define BALLOON_H  (BALLOON_HEIGHT + POINTER_HEIGHT + BALLOON_SHADOW)
+ #define CLOSE_BUTTON_RADIUS   (BALLOON_CORNER_RADIUS)
+ /* draw the bubble shape. this is used twice, once for the shape and once */
+ /* for the shadow */
+ static void
+ osm_gps_map_draw_balloon_shape (cairo_t *cr, int x0, int y0, int x1, int y1,
+        gboolean bottom, int px, int py, int px0, int px1) {
+     cairo_move_to (cr, x0, y0 + BALLOON_CORNER_RADIUS);
+     cairo_arc (cr, x0 + BALLOON_CORNER_RADIUS, y0 + BALLOON_CORNER_RADIUS,
+                BALLOON_CORNER_RADIUS, -M_PI, -M_PI/2);
+     if(!bottom) {
+         /* insert top pointer */
+         cairo_line_to (cr, px1, y0);
+         cairo_line_to (cr, px, py);
+         cairo_line_to (cr, px0, y0);
+     }
+     cairo_line_to (cr, x1 - BALLOON_CORNER_RADIUS, y0);
+     cairo_arc (cr, x1 - BALLOON_CORNER_RADIUS, y0 + BALLOON_CORNER_RADIUS,
+                BALLOON_CORNER_RADIUS, -M_PI/2, 0);
+     cairo_line_to (cr, x1 , y1 - BALLOON_CORNER_RADIUS);
+     cairo_arc (cr, x1 - BALLOON_CORNER_RADIUS, y1 - BALLOON_CORNER_RADIUS,
+                BALLOON_CORNER_RADIUS, 0, M_PI/2);
+     if(bottom) {
+         /* insert bottom pointer */
+         cairo_line_to (cr, px0, y1);
+         cairo_line_to (cr, px, py);
+         cairo_line_to (cr, px1, y1);
+     }
+     cairo_line_to (cr, x0 + BALLOON_CORNER_RADIUS, y1);
+     cairo_arc (cr, x0 + BALLOON_CORNER_RADIUS, y1 - BALLOON_CORNER_RADIUS,
+                BALLOON_CORNER_RADIUS, M_PI/2, M_PI);
+     cairo_close_path (cr);
+ }
+ static void
+ osd_render_balloon(osm_gps_map_osd_t *osd) {
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     /* get zoom */
+     gint zoom;
+     g_object_get(OSM_GPS_MAP(osd->widget), "zoom", &zoom, NULL);
+     /* ------- convert given coordinate into screen position --------- */
+     gint xs, ys;
+     osm_gps_map_geographic_to_screen (OSM_GPS_MAP(osd->widget),
+                                       priv->balloon.lat, priv->balloon.lon,
+                                       &xs, &ys);
+     gint x0 = 1, y0 = 1;
+     /* check position of this relative to screen center to determine */
+     /* pointer direction ... */
+     int pointer_x, pointer_x0, pointer_x1;
+     int pointer_y;
+     /* ... and calculate position */
+     int orientation = 0;
+     if(xs > osd->widget->allocation.width/2) {
+         priv->balloon.offset_x = -BALLOON_WIDTH + POINTER_OFFSET;
+         pointer_x = x0 - priv->balloon.offset_x;
+         pointer_x0 = pointer_x - (BALLOON_CORNER_RADIUS - POINTER_OFFSET);
+         pointer_x1 = pointer_x0 - POINTER_FOOT_WIDTH;
+         orientation |= 1;
+     } else {
+         priv->balloon.offset_x = -POINTER_OFFSET;
+         pointer_x = x0 - priv->balloon.offset_x;
+         pointer_x1 = pointer_x + (BALLOON_CORNER_RADIUS - POINTER_OFFSET);
+         pointer_x0 = pointer_x1 + POINTER_FOOT_WIDTH;
+     }
+     gboolean bottom = FALSE;
+     if(ys > osd->widget->allocation.height/2) {
+         priv->balloon.offset_y = -BALLOON_HEIGHT - POINTER_HEIGHT;
+         pointer_y = y0 - priv->balloon.offset_y;
+         bottom = TRUE;
+         orientation |= 2;
+     } else {
+         priv->balloon.offset_y = 0;
+         pointer_y = y0 - priv->balloon.offset_y;
+         y0 += POINTER_HEIGHT;
+     }
+     /* if required orientation equals current one, then don't render */
+     /* anything */
+     if(orientation == priv->balloon.orientation)
+         return;
+     priv->balloon.orientation = orientation;
+     /* calculate bottom/right of box */
+     int x1 = x0 + BALLOON_WIDTH, y1 = y0 + BALLOON_HEIGHT;
+     /* save balloon screen coordinates for later use */
+     priv->balloon.rect.x = x0 + BALLOON_BORDER;
+     priv->balloon.rect.y = y0 + BALLOON_BORDER;
+     priv->balloon.rect.w = x1 - x0 - 2*BALLOON_BORDER;
+     priv->balloon.rect.h = y1 - y0 - 2*BALLOON_BORDER;
+     cairo_t *cr = cairo_create(priv->balloon.surface);
+     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+     cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 0.0);
+     cairo_paint(cr);
+     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
+     /* --------- draw shadow --------------- */
+     osm_gps_map_draw_balloon_shape (cr,
+                  x0 + BALLOON_SHADOW, y0 + BALLOON_SHADOW,
+                  x1 + BALLOON_SHADOW, y1 + BALLOON_SHADOW,
+                  bottom, pointer_x, pointer_y,
+                  pointer_x0 + BALLOON_SHADOW, pointer_x1 + BALLOON_SHADOW);
+     cairo_set_source_rgba (cr, 0, 0, 0, BALLOON_SHADOW_TRANSPARENCY);
+     cairo_fill_preserve (cr);
+     cairo_set_source_rgba (cr, 1, 0, 0, 1.0);
+     cairo_set_line_width (cr, 0);
+     cairo_stroke (cr);
+     /* --------- draw main shape ----------- */
+     osm_gps_map_draw_balloon_shape (cr, x0, y0, x1, y1,
+                  bottom, pointer_x, pointer_y, pointer_x0, pointer_x1);
+     cairo_set_source_rgba (cr, 1, 1, 1, BALLOON_TRANSPARENCY);
+     cairo_fill_preserve (cr);
+     cairo_set_source_rgba (cr, 0, 0, 0, BALLOON_TRANSPARENCY);
+     cairo_set_line_width (cr, 1);
+     cairo_stroke (cr);
+     if (priv->balloon.cb) {
+         /* clip in case application tries to draw in */
+             /* exceed of the balloon */
+         cairo_rectangle (cr, priv->balloon.rect.x, priv->balloon.rect.y,
+                          priv->balloon.rect.w, priv->balloon.rect.h);
+         cairo_clip (cr);
+         cairo_new_path (cr);  /* current path is not
+                                  consumed by cairo_clip() */
+         priv->balloon.cb(cr, &priv->balloon.rect, priv->balloon.data);
+     }
+     cairo_destroy(cr);
+ }
+ /* return true if balloon is being displayed and if */
+ /* the given coordinate is within this balloon */
+ static gboolean
+ osd_balloon_check(osm_gps_map_osd_t *osd, gboolean down, gint x, gint y)
+ {
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     if(!priv->balloon.surface)
+         return FALSE;
+     gint xs, ys;
+     osm_gps_map_geographic_to_screen (OSM_GPS_MAP(osd->widget),
+                                       priv->balloon.lat, priv->balloon.lon,
+                                       &xs, &ys);
+     xs += priv->balloon.rect.x + priv->balloon.offset_x;
+     ys += priv->balloon.rect.y + priv->balloon.offset_y;
+     gboolean is_in =
+         (x > xs) && (x < xs + priv->balloon.rect.w) &&
+         (y > ys) && (y < ys + priv->balloon.rect.h);
+     /* handle the fact that the balloon may have been created by the */
+     /* button down event */
+     if(!is_in && !down && !priv->balloon.just_created) {
+         /* the user actually clicked outside the balloon */
+         /* close the balloon! */
+         osm_gps_map_osd_clear_balloon (OSM_GPS_MAP(osd->widget));
+     }
+     return is_in;
+ }
+ void osm_gps_map_osd_clear_balloon (OsmGpsMap *map) {
+     g_return_if_fail (OSM_IS_GPS_MAP (map));
+     osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
+     g_return_if_fail (osd);
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     g_return_if_fail (priv);
+     if(priv->balloon.surface) {
+         cairo_surface_destroy(priv->balloon.surface);
+         priv->balloon.surface = NULL;
+         priv->balloon.lat = OSM_GPS_MAP_INVALID;
+         priv->balloon.lon = OSM_GPS_MAP_INVALID;
+     }
+     osm_gps_map_redraw(map);
+ }
+ void
+ osm_gps_map_osd_draw_balloon (OsmGpsMap *map, float latitude, float longitude,
+                               OsmGpsMapBalloonCallback cb, gpointer data) {
+     g_return_if_fail (OSM_IS_GPS_MAP (map));
+     osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
+     g_return_if_fail (osd);
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     g_return_if_fail (priv);
+     osm_gps_map_osd_clear_balloon (map);
+     /* allocate balloon surface */
+     priv->balloon.surface =
+         cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+                                    BALLOON_W+2, BALLOON_H+2);
+     priv->balloon.lat = latitude;
+     priv->balloon.lon = longitude;
+     priv->balloon.cb = cb;
+     priv->balloon.data = data;
+     priv->balloon.just_created = TRUE;
+     priv->balloon.orientation = -1;
+     osd_render_balloon(osd);
+     osm_gps_map_redraw(map);
+ }
+ #endif // OSD_BALLOON
  /* position and extent of bounding box */
+ #ifndef OSD_X
  #define OSD_X      (10)
- #define OSD_Y      (10)
+ #endif
- #define OSD_COLOR            0.5, 0.5, 1
+ #ifndef OSD_Y
- #define OSD_COLOR_DISABLED   0.8, 0.8, 0.8
+ #define OSD_Y      (10)
+ #endif
  /* parameters of the direction shape */
- #ifndef OSM_GPS_MAP_OSD_DIAMETER
+ #ifndef OSD_DIAMETER
  #define D_RAD  (30)         // diameter of dpad
  #else
- #define D_RAD  (OSM_GPS_MAP_OSD_DIAMETER)
+ #define D_RAD  (OSD_DIAMETER)
  #endif
  #define D_TIP  (4*D_RAD/5)  // distance of arrow tip from dpad center
  #define D_LEN  (D_RAD/4)    // length of arrow
-Line 61 
 typedef struct {
+Line 387 
 typedef struct {
  #define Z_STEP   (D_RAD/4)  // distance between dpad and zoom
  #define Z_RAD    (D_RAD/2)  // radius of "caps" of zoom bar
+ #ifdef OSD_SHADOW_ENABLE
  /* shadow also depends on control size */
  #define OSD_SHADOW (D_RAD/6)
+ #else
+ #define OSD_SHADOW (0)
+ #endif
+ /* normally the GPS button is in the center of the dpad. if there's */
+ /* no dpad it will go into the zoom area */
+ #if defined(OSD_GPS_BUTTON) && defined(OSD_NO_DPAD)
+ #define Z_GPS  1
+ #else
+ #define Z_GPS  0
+ #endif
  /* total width and height of controls incl. shadow */
- #define OSD_W    (2*D_RAD + OSD_SHADOW)
+ #define OSD_W    (2*D_RAD + OSD_SHADOW + Z_GPS * 2 * Z_RAD)
+ #if !Z_GPS
  #define OSD_H    (2*D_RAD + Z_STEP + 2*Z_RAD + OSD_SHADOW)
+ #else
+ #define OSD_H    (2*Z_RAD + OSD_SHADOW)
+ #endif
+ #ifdef OSD_SHADOW_ENABLE
  #define OSD_LBL_SHADOW (OSD_SHADOW/2)
+ #endif
+ #define Z_TOP    ((1-Z_GPS) * (2 * D_RAD + Z_STEP))
- #define Z_TOP    (2 * D_RAD + Z_STEP)
  #define Z_MID    (Z_TOP + Z_RAD)
  #define Z_BOT    (Z_MID + Z_RAD)
  #define Z_LEFT   (Z_RAD)
- #define Z_RIGHT  (2 * D_RAD - Z_RAD)
+ #define Z_RIGHT  (2 * D_RAD - Z_RAD + Z_GPS * 2 * Z_RAD)
+ #define Z_CENTER ((Z_RIGHT + Z_LEFT)/2)
  /* create the cairo shape used for the zoom buttons */
  static void
- osm_gps_map_osd_zoom_shape(cairo_t *cr, gint x, gint y)
+ osd_zoom_shape(cairo_t *cr, gint x, gint y)
  {
      cairo_move_to (cr, x+Z_LEFT,    y+Z_TOP);
      cairo_line_to (cr, x+Z_RIGHT,   y+Z_TOP);
-Line 88 
 osm_gps_map_osd_zoom_shape(cairo_t *cr,
+Line 433 
 osm_gps_map_osd_zoom_shape(cairo_t *cr,
      cairo_arc     (cr, x+Z_LEFT,    y+Z_MID, Z_RAD,  M_PI/2, -M_PI/2);
  }
+ /* ------------------- color/shadow functions ----------------- */
+ #ifndef OSD_COLOR
+ /* if no color has been specified we just use the gdks default colors */
+ static void
+ osd_labels(cairo_t *cr, gint width, gboolean enabled,
+                        GdkColor *fg, GdkColor *disabled) {
+     if(enabled)  gdk_cairo_set_source_color(cr, fg);
+     else         gdk_cairo_set_source_color(cr, disabled);
+     cairo_set_line_width (cr, width);
+ }
+ #else
+ static void
+ osd_labels(cairo_t *cr, gint width, gboolean enabled) {
+     if(enabled)  cairo_set_source_rgb (cr, OSD_COLOR);
+     else         cairo_set_source_rgb (cr, OSD_COLOR_DISABLED);
+     cairo_set_line_width (cr, width);
+ }
+ #endif
+ #ifdef OSD_SHADOW_ENABLE
+ static void
+ osd_labels_shadow(cairo_t *cr, gint width, gboolean enabled) {
+     cairo_set_source_rgba (cr, 0, 0, 0, enabled?0.3:0.15);
+     cairo_set_line_width (cr, width);
+ }
+ #endif
+ #ifndef OSD_NO_DPAD
  /* create the cairo shape used for the dpad */
  static void
- osm_gps_map_osd_dpad_shape(cairo_t *cr, gint x, gint y)
+ osd_dpad_shape(cairo_t *cr, gint x, gint y)
  {
      cairo_arc (cr, x+D_RAD, y+D_RAD, D_RAD, 0, 2 * M_PI);
  }
+ #endif
+ #ifdef OSD_SHADOW_ENABLE
+ static void
+ osd_shape_shadow(cairo_t *cr) {
+     cairo_set_source_rgba (cr, 0, 0, 0, 0.2);
+     cairo_fill (cr);
+     cairo_stroke (cr);
+ }
+ #endif
+ #ifndef OSD_COLOR
+ /* if no color has been specified we just use the gdks default colors */
+ static void
+ osd_shape(cairo_t *cr, GdkColor *bg, GdkColor *fg) {
+     gdk_cairo_set_source_color(cr, bg);
+     cairo_fill_preserve (cr);
+     gdk_cairo_set_source_color(cr, fg);
+     cairo_set_line_width (cr, 1);
+     cairo_stroke (cr);
+ }
+ #else
+ static void
+ osd_shape(cairo_t *cr) {
+     cairo_set_source_rgb (cr, OSD_COLOR_BG);
+     cairo_fill_preserve (cr);
+     cairo_set_source_rgb (cr, OSD_COLOR);
+     cairo_set_line_width (cr, 1);
+     cairo_stroke (cr);
+ }
+ #endif
  static gboolean
  osm_gps_map_in_circle(gint x, gint y, gint cx, gint cy, gint rad)
-Line 101 
 osm_gps_map_in_circle(gint x, gint y, gi
+Line 507 
 osm_gps_map_in_circle(gint x, gint y, gi
      return( pow(cx - x, 2) + pow(cy - y, 2) < rad * rad);
  }
+ #ifndef OSD_NO_DPAD
  /* check whether x/y is within the dpad */
  static osd_button_t
- osm_gps_map_osd_check_dpad(gint x, gint y)
+ osd_check_dpad(gint x, gint y)
  {
      /* within entire dpad circle */
-     if( osm_gps_map_in_circle(x, y, OSD_X + D_RAD, OSD_Y + D_RAD, D_RAD))
+     if( osm_gps_map_in_circle(x, y, D_RAD, D_RAD, D_RAD))
      {
          /* convert into position relative to dpads centre */
-         x -= (OSD_X + D_RAD);
+         x -= D_RAD;
-         y -= (OSD_Y + D_RAD);
+         y -= D_RAD;
+ #ifdef OSD_GPS_BUTTON
          /* check for dpad center goes here! */
          if( osm_gps_map_in_circle(x, y, 0, 0, D_RAD/3))
              return OSD_GPS;
+ #endif
          if( y < 0 && abs(x) < abs(y))
              return OSD_UP;
-Line 132 
 osm_gps_map_osd_check_dpad(gint x, gint
+Line 541 
 osm_gps_map_osd_check_dpad(gint x, gint
      }
      return OSD_NONE;
  }
+ #endif
  /* check whether x/y is within the zoom pads */
  static osd_button_t
- osm_gps_map_osd_check_zoom(gint x, gint y) {
+ osd_check_zoom(gint x, gint y) {
-     if( x > OSD_X && x < (OSD_X + OSD_W) && y > Z_TOP && y < (OSD_Y+Z_BOT)) {
+     if( x > 0 && x < OSD_W && y > Z_TOP && y < Z_BOT) {
          /* within circle around (-) label */
-         if( osm_gps_map_in_circle(x, y, OSD_X + Z_LEFT, OSD_Y + Z_MID, Z_RAD))
+         if( osm_gps_map_in_circle(x, y, Z_LEFT, Z_MID, Z_RAD))
-             return OSD_OUT;
-         /* between center of (-) button and center of entire zoom control area */
-         if(x > OSD_LEFT && x < OSD_X + D_RAD)
              return OSD_OUT;
          /* within circle around (+) label */
-         if( osm_gps_map_in_circle(x, y, OSD_X + Z_RIGHT, OSD_Y + Z_MID, Z_RAD))
+         if( osm_gps_map_in_circle(x, y, Z_RIGHT, Z_MID, Z_RAD))
              return OSD_IN;
+ #if Z_GPS == 1
+         /* within square around center */
+         if( x > Z_CENTER - Z_RAD && x < Z_CENTER + Z_RAD)
+             return OSD_GPS;
+ #endif
+         /* between center of (-) button and center of entire zoom control area */
+         if(x > OSD_LEFT && x < D_RAD)
+             return OSD_OUT;
          /* between center of (+) button and center of entire zoom control area */
-         if(x < OSD_RIGHT && x > OSD_X + D_RAD)
+         if(x < OSD_RIGHT && x > D_RAD)
              return OSD_IN;
      }
      return OSD_NONE;
  }
- static osd_button_t
+ #ifdef OSD_SOURCE_SEL
- osm_gps_map_osd_check(gint x, gint y) {
-     osd_button_t but = OSD_NONE;
-     /* first do a rough test for the OSD area. */
+ /* place source selection at right border */
-     /* this is just to avoid an unnecessary detailed test */
+ #define OSD_S_RAD (Z_RAD)
-     if(x > OSD_X && x < OSD_X + OSD_W &&
+ #define OSD_S_X   (-OSD_X)
-        y > OSD_Y && y < OSD_Y + OSD_H) {
+ #define OSD_S_Y   (OSD_Y)
-         but = osm_gps_map_osd_check_dpad(x, y);
+ #define OSD_S_PW  (2 * Z_RAD)
+ #define OSD_S_W   (OSD_S_PW)
+ #define OSD_S_PH  (2 * Z_RAD)
+ #define OSD_S_H   (OSD_S_PH + OSD_SHADOW)
+ /* size of usable area when expanded */
+ #define OSD_S_AREA_W (priv->source_sel.width)
+ #define OSD_S_AREA_H (priv->source_sel.height)
+ #define OSD_S_EXP_W  (OSD_S_PW + OSD_S_AREA_W + OSD_SHADOW)
+ #define OSD_S_EXP_H  (OSD_S_AREA_H + OSD_SHADOW)
+ /* internal value to draw the arrow on the "puller" */
+ #define OSD_S_D0  (OSD_S_RAD/2)
+ #ifndef OSD_FONT_SIZE
+ #define OSD_FONT_SIZE 16.0
+ #endif
+ #define OSD_TEXT_BORDER   (OSD_FONT_SIZE/2)
+ #define OSD_TEXT_SKIP     (OSD_FONT_SIZE/8)
-         if(but == OSD_NONE)
+ /* draw the shape of the source selection OSD, either only the puller (not expanded) */
-             but = osm_gps_map_osd_check_zoom(x, y);
+ /* or the entire menu incl. the puller (expanded) */
+ static void
+ osd_source_shape(osd_priv_t *priv, cairo_t *cr, gint x, gint y) {
+     if(!priv->source_sel.expanded) {
+         /* just draw the puller */
+         cairo_move_to (cr, x + OSD_S_PW, y + OSD_S_PH);
+         cairo_arc (cr, x+OSD_S_RAD, y+OSD_S_RAD, OSD_S_RAD, M_PI/2, -M_PI/2);
+         cairo_line_to (cr, x + OSD_S_PW, y);
+     } else {
+         /* draw the puller and the area itself */
+         cairo_move_to (cr, x + OSD_S_PW + OSD_S_AREA_W, y + OSD_S_AREA_H);
+         cairo_line_to (cr, x + OSD_S_PW, y + OSD_S_AREA_H);
+         if(OSD_S_Y > 0) {
+             cairo_line_to (cr, x + OSD_S_PW, y + OSD_S_PH);
+             cairo_arc (cr, x+OSD_S_RAD, y+OSD_S_RAD, OSD_S_RAD, M_PI/2, -M_PI/2);
+         } else {
+             cairo_arc (cr, x+OSD_S_RAD, y+OSD_S_AREA_H-OSD_S_RAD, OSD_S_RAD, M_PI/2, -M_PI/2);
+             cairo_line_to (cr, x + OSD_S_PW, y + OSD_S_AREA_H - OSD_S_PH);
+             cairo_line_to (cr, x + OSD_S_PW, y);
+         }
+         cairo_line_to (cr, x + OSD_S_PW + OSD_S_AREA_W, y);
+         cairo_close_path (cr);
      }
-     return but;
  }
  static void
- osm_gps_map_osd_shape_shadow(cairo_t *cr) {
+ osd_source_content(osm_gps_map_osd_t *osd, cairo_t *cr, gint offset) {
-     cairo_set_source_rgba (cr, 0, 0, 0, 0.2);
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
-     cairo_fill (cr);
-     cairo_stroke (cr);
- }
- static void
+     int py = offset + OSD_S_RAD - OSD_S_D0;
- osm_gps_map_osd_shape(cairo_t *cr) {
-     cairo_set_source_rgb (cr, 1, 1, 1);
-     cairo_fill_preserve (cr);
-     cairo_set_source_rgb (cr, OSD_COLOR);
-     cairo_set_line_width (cr, 1);
-     cairo_stroke (cr);
- }
- static void
+     if(!priv->source_sel.expanded) {
- osm_gps_map_osd_dpad_labels(cairo_t *cr, gint x, gint y) {
+         /* draw the "puller" open (<) arrow */
-     /* move reference to dpad center */
+         cairo_move_to (cr, offset + OSD_S_RAD + OSD_S_D0/2, py);
-     x += D_RAD;
+         cairo_rel_line_to (cr, -OSD_S_D0, +OSD_S_D0);
-     y += D_RAD;
+         cairo_rel_line_to (cr, +OSD_S_D0, +OSD_S_D0);
+     } else {
+         if(OSD_S_Y < 0)
+             py += OSD_S_AREA_H - OSD_S_PH;
+         /* draw the "puller" close (>) arrow */
+         cairo_move_to (cr, offset + OSD_S_RAD - OSD_S_D0/2, py);
+         cairo_rel_line_to (cr, +OSD_S_D0, +OSD_S_D0);
+         cairo_rel_line_to (cr, -OSD_S_D0, +OSD_S_D0);
+         cairo_stroke(cr);
+         /* don't draw a shadow for the text content */
+         if(offset == 1) {
+             gint source;
+             g_object_get(osd->widget, "map-source", &source, NULL);
+             cairo_select_font_face (cr, "Sans",
+                                     CAIRO_FONT_SLANT_NORMAL,
+                                     CAIRO_FONT_WEIGHT_BOLD);
+             cairo_set_font_size (cr, OSD_FONT_SIZE);
+             int i, step = (priv->source_sel.height - 2*OSD_TEXT_BORDER) /
+                 OSM_GPS_MAP_SOURCE_LAST;
+             for(i=OSM_GPS_MAP_SOURCE_NULL+1;i<=OSM_GPS_MAP_SOURCE_LAST;i++) {
+                 cairo_text_extents_t extents;
+                 const char *src = osm_gps_map_source_get_friendly_name(i);
+                 cairo_text_extents (cr, src, &extents);
+                 int x = offset + OSD_S_PW + OSD_TEXT_BORDER;
+                 int y = offset + step * (i-1) + OSD_TEXT_BORDER;
+                 /* draw filled rectangle if selected */
+                 if(source == i) {
+                     cairo_rectangle(cr, x - OSD_TEXT_BORDER/2,
+                                     y - OSD_TEXT_SKIP,
+                                     priv->source_sel.width - OSD_TEXT_BORDER,
+                                     step + OSD_TEXT_SKIP);
+                     cairo_fill(cr);
+                     /* temprarily draw with background color */
+ #ifndef OSD_COLOR
+                     GdkColor bg = osd->widget->style->bg[GTK_STATE_NORMAL];
+                     gdk_cairo_set_source_color(cr, &bg);
+ #else
+                     cairo_set_source_rgb (cr, OSD_COLOR_BG);
+ #endif
+                 }
-     const static gint offset[][3][2] = {
+                 cairo_move_to (cr, x, y + OSD_TEXT_SKIP - extents.y_bearing);
-         /* left arrow/triangle */
+                 cairo_show_text (cr, src);
-         { { -D_TIP+D_LEN, -D_WID }, { -D_LEN, D_WID }, { +D_LEN, D_WID } },
-         /* right arrow/triangle */
-         { { +D_TIP-D_LEN, -D_WID }, { +D_LEN, D_WID }, { -D_LEN, D_WID } },
-         /* top arrow/triangle */
-         { { -D_WID, -D_TIP+D_LEN }, { D_WID, -D_LEN }, { D_WID, +D_LEN } },
-         /* bottom arrow/triangle */
-         { { -D_WID, +D_TIP-D_LEN }, { D_WID, +D_LEN }, { D_WID, -D_LEN } }
-     };
-     int i;
+                 /* restore color */
-     for(i=0;i<4;i++) {
+                 if(source == i) {
-         cairo_move_to (cr, x + offset[i][0][0], y + offset[i][0][1]);
+ #ifndef OSD_COLOR
-         cairo_rel_line_to (cr, offset[i][1][0], offset[i][1][1]);
+                     GdkColor fg = osd->widget->style->fg[GTK_STATE_NORMAL];
-         cairo_rel_line_to (cr, offset[i][2][0], offset[i][2][1]);
+                     gdk_cairo_set_source_color(cr, &fg);
+ #else
+                     cairo_set_source_rgb (cr, OSD_COLOR);
+ #endif
+                 }
+             }
+         }
      }
  }
- /* draw the sattelite dish icon in the center of the dpad */
- #define GPS_V0  (D_RAD/8)
- #define GPS_V1  (D_RAD/10)
- #define GPS_V2  (D_RAD/5)
- /* draw a satellite receiver dish */
  static void
- osm_gps_map_osd_dpad_gps(cairo_t *cr, gint x, gint y) {
+ osd_render_source_sel(osm_gps_map_osd_t *osd, gboolean force_rerender) {
-     /* move reference to dpad center */
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
-     x += D_RAD;
-     y += D_RAD + GPS_V0;
-     cairo_move_to (cr, x-GPS_V0, y+GPS_V0);
+     if(priv->source_sel.rendered && !force_rerender)
-     cairo_rel_line_to (cr, +GPS_V0, -GPS_V0);
+         return;
-     cairo_rel_line_to (cr, +GPS_V0, +GPS_V0);
-     cairo_close_path (cr);
-     cairo_move_to (cr, x+GPS_V1-GPS_V2, y-2*GPS_V2);
+     priv->source_sel.rendered = TRUE;
-     cairo_curve_to (cr, x-GPS_V2, y, x+GPS_V1, y+GPS_V1, x+GPS_V1+GPS_V2, y);
-     cairo_close_path (cr);
-     x += GPS_V1;
+ #ifndef OSD_COLOR
-     cairo_move_to (cr, x, y-GPS_V2);
+     GdkColor bg = GTK_WIDGET(osd->widget)->style->bg[GTK_STATE_NORMAL];
-     cairo_rel_line_to (cr, +GPS_V1, -GPS_V1);
+     GdkColor fg = GTK_WIDGET(osd->widget)->style->fg[GTK_STATE_NORMAL];
- }
+     GdkColor da = GTK_WIDGET(osd->widget)->style->fg[GTK_STATE_INSENSITIVE];
+ #endif
- #define Z_LEN  (2*Z_RAD/3)
+     /* draw source selector */
+     cairo_t *cr = cairo_create(priv->source_sel.surface);
+     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+     cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
+     cairo_paint(cr);
+     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
- static void
+ #ifdef OSD_SHADOW_ENABLE
- osm_gps_map_osd_zoom_labels(cairo_t *cr, gint x, gint y) {
+     osd_source_shape(priv, cr, 1+OSD_SHADOW, 1+OSD_SHADOW);
-     cairo_move_to (cr, x + Z_LEFT  - Z_LEN, y + Z_MID);
+     osd_shape_shadow(cr);
-     cairo_line_to (cr, x + Z_LEFT  + Z_LEN, y + Z_MID);
+ #endif
-     cairo_move_to (cr, x + Z_RIGHT,         y + Z_MID - Z_LEN);
+     osd_source_shape(priv, cr, 1, 1);
-     cairo_line_to (cr, x + Z_RIGHT,         y + Z_MID + Z_LEN);
+ #ifndef OSD_COLOR
-     cairo_move_to (cr, x + Z_RIGHT - Z_LEN, y + Z_MID);
+     osd_shape(cr, &bg, &fg);
-     cairo_line_to (cr, x + Z_RIGHT + Z_LEN, y + Z_MID);
+ #else
- }
+     osd_shape(cr);
+ #endif
- static void
+ #ifdef OSD_SHADOW_ENABLE
- osm_gps_map_osd_labels(cairo_t *cr, gint width, gboolean enabled) {
+     osd_labels_shadow(cr, Z_RAD/3, TRUE);
-     if(enabled)  cairo_set_source_rgb (cr, OSD_COLOR);
+     osd_source_content(osd, cr, 1+OSD_LBL_SHADOW);
-     else         cairo_set_source_rgb (cr, OSD_COLOR_DISABLED);
-     cairo_set_line_width (cr, width);
      cairo_stroke (cr);
- }
+ #endif
+ #ifndef OSD_COLOR
- static void
+     osd_labels(cr, Z_RAD/3, TRUE, &fg, &da);
- osm_gps_map_osd_labels_shadow(cairo_t *cr, gint width, gboolean enabled) {
+ #else
-     cairo_set_source_rgba (cr, 0, 0, 0, enabled?0.3:0.15);
+     osd_labels(cr, Z_RAD/3, TRUE);
-     cairo_set_line_width (cr, width);
+ #endif
+     osd_source_content(osd, cr, 1);
      cairo_stroke (cr);
+     cairo_destroy(cr);
  }
+ /* re-allocate the buffer used to draw the menu. This is used */
+ /* to collapse/expand the buffer */
  static void
- osm_gps_map_osd_render(osm_gps_map_osd_t *osd) {
+ osd_source_reallocate(osm_gps_map_osd_t *osd) {
      osd_priv_t *priv = (osd_priv_t*)osd->priv;
-     /* first fill with transparency */
+     /* re-allocate offscreen bitmap */
-     cairo_t *cr = cairo_create(priv->overlay);
+     g_assert (priv->source_sel.surface);
-     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
-     cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
-     cairo_paint(cr);
-     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
+     int w = OSD_S_W, h = OSD_S_H;
+     if(priv->source_sel.expanded) {
+         cairo_text_extents_t extents;
+         /* determine content size */
+         cairo_t *cr = cairo_create(priv->source_sel.surface);
+         cairo_select_font_face (cr, "Sans",
+                                 CAIRO_FONT_SLANT_NORMAL,
+                                 CAIRO_FONT_WEIGHT_BOLD);
+         cairo_set_font_size (cr, OSD_FONT_SIZE);
+         /* calculate menu size */
+         int i, max_h = 0, max_w = 0;
+         for(i=OSM_GPS_MAP_SOURCE_NULL+1;i<=OSM_GPS_MAP_SOURCE_LAST;i++) {
+             const char *src = osm_gps_map_source_get_friendly_name(i);
+             cairo_text_extents (cr, src, &extents);
+             if(extents.width > max_w) max_w = extents.width;
+             if(extents.height > max_h) max_h = extents.height;
+         }
+         cairo_destroy(cr);
+         priv->source_sel.width  = max_w + 2*OSD_TEXT_BORDER;
+         priv->source_sel.height = OSM_GPS_MAP_SOURCE_LAST *
+             (max_h + 2*OSD_TEXT_SKIP) + 2*OSD_TEXT_BORDER;
-     /* --------- draw zoom and dpad shape shadow ----------- */
+         w = OSD_S_EXP_W;
-     gint x = 0, y = 0;
+         h = OSD_S_EXP_H;
+     }
-     osm_gps_map_osd_zoom_shape(cr, x + OSD_SHADOW, y + OSD_SHADOW);
+     cairo_surface_destroy(priv->source_sel.surface);
-     osm_gps_map_osd_shape_shadow(cr);
+     priv->source_sel.surface =
-     osm_gps_map_osd_dpad_shape(cr, x + OSD_SHADOW, y + OSD_SHADOW);
+         cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w+2, h+2);
-     osm_gps_map_osd_shape_shadow(cr);
-     /* --------- draw zoom and dpad shape ----------- */
+     osd_render_source_sel(osd, TRUE);
+ }
-     osm_gps_map_osd_zoom_shape(cr, x, y);
+ #define OSD_HZ      15
-     osm_gps_map_osd_shape(cr);
+ #define OSD_TIME    500
-     osm_gps_map_osd_dpad_shape(cr, x, y);
-     osm_gps_map_osd_shape(cr);
-     /* --------- draw zoom and dpad labels --------- */
+ static gboolean osd_source_animate(gpointer data) {
+     osm_gps_map_osd_t *osd = (osm_gps_map_osd_t*)data;
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     int diff = OSD_S_EXP_W - OSD_S_W - OSD_S_X;
+     gboolean done = FALSE;
+     priv->source_sel.count += priv->source_sel.dir;
+     /* shifting in */
+     if(priv->source_sel.dir < 0) {
+         if(priv->source_sel.count <= 0) {
+             priv->source_sel.count = 0;
+             done = TRUE;
+         }
+     } else {
+         if(priv->source_sel.count >= 1000) {
+             priv->source_sel.expanded = FALSE;
+             osd_source_reallocate(osd);
+             priv->source_sel.count = 1000;
+             done = TRUE;
+         }
+     }
+     /* count runs linearly from 0 to 1000, map this nicely onto a position */
+     /* nice sinoid mapping */
+     float m = 0.5-cos(priv->source_sel.count * M_PI / 1000.0)/2;
+     priv->source_sel.shift =
+         (osd->widget->allocation.width - OSD_S_EXP_W + OSD_S_X) +
+         m * diff;
+     /* make sure the screen is updated */
+     osm_gps_map_repaint(OSM_GPS_MAP(osd->widget));
+     /* stop animation if done */
+     if(done)
+         priv->source_sel.handler_id = 0;
+     return !done;
+ }
+ /* switch between expand and collapse mode of source selection */
+ static void
+ osd_source_toggle(osm_gps_map_osd_t *osd)
+ {
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     /* ignore clicks while animation is running */
+     if(priv->source_sel.handler_id)
+         return;
+     /* expand immediately, collapse is handle at the end of the */
+     /* collapse animation */
+     if(!priv->source_sel.expanded) {
+         priv->source_sel.expanded = TRUE;
+         osd_source_reallocate(osd);
+         priv->source_sel.count = 1000;
+         priv->source_sel.shift = osd->widget->allocation.width - OSD_S_W;
+         priv->source_sel.dir = -1000/OSD_HZ;
+     } else {
+         priv->source_sel.count =  0;
+         priv->source_sel.shift = osd->widget->allocation.width -
+             OSD_S_EXP_W + OSD_S_X;
+         priv->source_sel.dir = +1000/OSD_HZ;
+     }
+     /* start timer to handle animation */
+     priv->source_sel.handler_id = gtk_timeout_add(OSD_TIME/OSD_HZ,
+                                                   osd_source_animate, osd);
+ }
+ /* check if the user clicked inside the source selection area */
+ static osd_button_t
+ osd_source_check(osm_gps_map_osd_t *osd, gboolean down, gint x, gint y) {
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     if(!priv->source_sel.expanded)
+         x -= osd->widget->allocation.width - OSD_S_W;
+     else
+         x -= osd->widget->allocation.width - OSD_S_EXP_W + OSD_S_X;
+     if(OSD_S_Y > 0)
+         y -= OSD_S_Y;
+     else
+         y -= osd->widget->allocation.height - OSD_S_PH + OSD_S_Y;
+     /* within square around puller? */
+     if(y > 0 && y < OSD_S_PH && x > 0 && x < OSD_S_PW) {
+         /* really within puller shape? */
+         if(x > Z_RAD || osm_gps_map_in_circle(x, y, Z_RAD, Z_RAD, Z_RAD)) {
+             /* expand source selector */
+             if(down)
+                 osd_source_toggle(osd);
+             /* tell upper layers that user clicked some background element */
+             /* of the OSD */
+             return OSD_BG;
+         }
+     }
+     /* check for clicks into data area */
+     if(priv->source_sel.expanded && !priv->source_sel.handler_id) {
+         /* re-adjust from puller top to content top */
+         if(OSD_S_Y < 0)
+             y += OSD_S_EXP_H - OSD_S_PH;
+         if(x > OSD_S_PW &&
+            x < OSD_S_PW + OSD_S_EXP_W &&
+            y > 0 &&
+            y < OSD_S_EXP_H) {
+             int step = (priv->source_sel.height - 2*OSD_TEXT_BORDER)
+                 / OSM_GPS_MAP_SOURCE_LAST;
+             y -= OSD_TEXT_BORDER - OSD_TEXT_SKIP;
+             y /= step;
+             y += 1;
+             if(down) {
+                 gint old = 0;
+                 g_object_get(osd->widget, "map-source", &old, NULL);
+                 if(y > OSM_GPS_MAP_SOURCE_NULL &&
+                    y <= OSM_GPS_MAP_SOURCE_LAST &&
+                    old != y) {
+                     g_object_set(osd->widget, "map-source", y, NULL);
+                     osd_render_source_sel(osd, TRUE);
+                     osm_gps_map_repaint(OSM_GPS_MAP(osd->widget));
+                 }
+             }
+             /* return "clicked in OSD background" to prevent further */
+             /* processing by application */
+             return OSD_BG;
+         }
+     }
+     return OSD_NONE;
+ }
+ #endif // OSD_SOURCE_SEL
+ static osd_button_t
+ osd_check(osm_gps_map_osd_t *osd, gboolean down, gint x, gint y) {
+     osd_button_t but = OSD_NONE;
+ #ifdef OSD_BALLOON
+     if(down) {
+         /* needed to handle balloons that are created at click */
+         osd_priv_t *priv = (osd_priv_t*)osd->priv;
+         priv->balloon.just_created = FALSE;
+     }
+ #endif
+ #ifdef OSD_SOURCE_SEL
+     /* the source selection area is handles internally */
+     but = osd_source_check(osd, down, x, y);
+ #endif
+     if(but == OSD_NONE) {
+         gint mx = x - OSD_X;
+         gint my = y - OSD_Y;
+         if(OSD_X < 0)
+             mx -= (osd->widget->allocation.width - OSD_W);
+         if(OSD_Y < 0)
+             my -= (osd->widget->allocation.height - OSD_H);
+         /* first do a rough test for the OSD area. */
+         /* this is just to avoid an unnecessary detailed test */
+         if(mx > 0 && mx < OSD_W && my > 0 && my < OSD_H) {
+ #ifndef OSD_NO_DPAD
+             but = osd_check_dpad(mx, my);
+ #endif
+         }
+         if(but == OSD_NONE)
+             but = osd_check_zoom(mx, my);
+     }
+ #ifdef OSD_BALLOON
+     if(but == OSD_NONE) {
+         /* check if user clicked into balloon */
+         if(osd_balloon_check(osd, down, x, y))
+             but = OSD_BG;
+     }
+ #endif
+     return but;
+ }
+ #ifndef OSD_NO_DPAD
+ static void
+ osd_dpad_labels(cairo_t *cr, gint x, gint y) {
+     /* move reference to dpad center */
+     x += D_RAD;
+     y += D_RAD;
+     const static gint offset[][3][2] = {
+         /* left arrow/triangle */
+         { { -D_TIP+D_LEN, -D_WID }, { -D_LEN, D_WID }, { +D_LEN, D_WID } },
+         /* right arrow/triangle */
+         { { +D_TIP-D_LEN, -D_WID }, { +D_LEN, D_WID }, { -D_LEN, D_WID } },
+         /* top arrow/triangle */
+         { { -D_WID, -D_TIP+D_LEN }, { D_WID, -D_LEN }, { D_WID, +D_LEN } },
+         /* bottom arrow/triangle */
+         { { -D_WID, +D_TIP-D_LEN }, { D_WID, +D_LEN }, { D_WID, -D_LEN } }
+     };
+     int i;
+     for(i=0;i<4;i++) {
+         cairo_move_to (cr, x + offset[i][0][0], y + offset[i][0][1]);
+         cairo_rel_line_to (cr, offset[i][1][0], offset[i][1][1]);
+         cairo_rel_line_to (cr, offset[i][2][0], offset[i][2][1]);
+     }
+ }
+ #endif
+ #ifdef OSD_GPS_BUTTON
+ /* draw the satellite dish icon in the center of the dpad */
+ #define GPS_V0  (D_RAD/7)
+ #define GPS_V1  (D_RAD/10)
+ #define GPS_V2  (D_RAD/5)
+ /* draw a satellite receiver dish */
+ /* this is either drawn in the center of the dpad (if present) */
+ /* or in the middle of the zoom area */
+ static void
+ osd_dpad_gps(cairo_t *cr, gint x, gint y) {
+     /* move reference to dpad center */
+     x += (1-Z_GPS) * D_RAD + Z_GPS * Z_RAD * 3;
+     y += (1-Z_GPS) * D_RAD + Z_GPS * Z_RAD + GPS_V0;
+     cairo_move_to (cr, x-GPS_V0, y+GPS_V0);
+     cairo_rel_line_to (cr, +GPS_V0, -GPS_V0);
+     cairo_rel_line_to (cr, +GPS_V0, +GPS_V0);
+     cairo_close_path (cr);
+     cairo_move_to (cr, x+GPS_V1-GPS_V2, y-2*GPS_V2);
+     cairo_curve_to (cr, x-GPS_V2, y, x+GPS_V1, y+GPS_V1, x+GPS_V1+GPS_V2, y);
+     cairo_close_path (cr);
+     x += GPS_V1;
+     cairo_move_to (cr, x, y-GPS_V2);
+     cairo_rel_line_to (cr, +GPS_V1, -GPS_V1);
+ }
+ #endif
+ #define Z_LEN  (2*Z_RAD/3)
+ static void
+ osd_zoom_labels(cairo_t *cr, gint x, gint y) {
+     cairo_move_to (cr, x + Z_LEFT  - Z_LEN, y + Z_MID);
+     cairo_line_to (cr, x + Z_LEFT  + Z_LEN, y + Z_MID);
+     cairo_move_to (cr, x + Z_RIGHT,         y + Z_MID - Z_LEN);
+     cairo_line_to (cr, x + Z_RIGHT,         y + Z_MID + Z_LEN);
+     cairo_move_to (cr, x + Z_RIGHT - Z_LEN, y + Z_MID);
+     cairo_line_to (cr, x + Z_RIGHT + Z_LEN, y + Z_MID);
+ }
+ #ifdef OSD_COORDINATES
+ #ifndef OSD_COORDINATES_FONT_SIZE
+ #define OSD_COORDINATES_FONT_SIZE 12
+ #endif
+ #define OSD_COORDINATES_OFFSET (OSD_COORDINATES_FONT_SIZE/6)
+ #define OSD_COORDINATES_W  (8*OSD_COORDINATES_FONT_SIZE+2*OSD_COORDINATES_OFFSET)
+ #define OSD_COORDINATES_H  (2*OSD_COORDINATES_FONT_SIZE+2*OSD_COORDINATES_OFFSET+OSD_COORDINATES_FONT_SIZE/4)
+ /* these can be overwritten with versions that support */
+ /* localization */
+ #ifndef OSD_COORDINATES_CHR_N
+ #define OSD_COORDINATES_CHR_N  "N"
+ #endif
+ #ifndef OSD_COORDINATES_CHR_S
+ #define OSD_COORDINATES_CHR_S  "S"
+ #endif
+ #ifndef OSD_COORDINATES_CHR_E
+ #define OSD_COORDINATES_CHR_E  "E"
+ #endif
+ #ifndef OSD_COORDINATES_CHR_W
+ #define OSD_COORDINATES_CHR_W  "W"
+ #endif
+ /* this is the classic geocaching notation */
+ static char
+ *osd_latitude_str(float latitude) {
+     char *c = OSD_COORDINATES_CHR_N;
+     float integral, fractional;
+     if(isnan(latitude))
+         return NULL;
+     if(latitude < 0) {
+         latitude = fabs(latitude);
+         c = OSD_COORDINATES_CHR_S;
+     }
+     fractional = modff(latitude, &integral);
+     return g_strdup_printf("%s %02d° %06.3f'",
+                            c, (int)integral, fractional*60.0);
+ }
+ static char
+ *osd_longitude_str(float longitude) {
+     char *c = OSD_COORDINATES_CHR_E;
+     float integral, fractional;
+     if(isnan(longitude))
+         return NULL;
+     if(longitude < 0) {
+         longitude = fabs(longitude);
+         c = OSD_COORDINATES_CHR_W;
+     }
+     fractional = modff(longitude, &integral);
+     return g_strdup_printf("%s %03d° %06.3f'",
+                            c, (int)integral, fractional*60.0);
+ }
+ /* render a string at the given screen position */
+ static int
+ osd_render_centered_text(cairo_t *cr, int y, int width, char *text) {
+     char *p = g_strdup(text);
+     cairo_text_extents_t extents;
+     cairo_text_extents (cr, p, &extents);
+     /* check if text needs to be truncated */
+     int len = strlen(text)-2;
+     while(extents.width > width) {
+         len--;
+         strcpy(p+len, "...");
+         cairo_text_extents (cr, p, &extents);
+     }
+     cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
+     cairo_set_line_width (cr, OSD_COORDINATES_FONT_SIZE/6);
+     cairo_move_to (cr, (width - extents.width)/2, y - extents.y_bearing);
+     cairo_text_path (cr, p);
+     cairo_stroke (cr);
+     cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
+     cairo_move_to (cr, (width - extents.width)/2, y - extents.y_bearing);
+     cairo_show_text (cr, p);
+     g_free(p);
+     /* skip + 1/4 line */
+     return y + 5*OSD_COORDINATES_FONT_SIZE/4;
+ }
+ static void
+ osd_render_coordinates(osm_gps_map_osd_t *osd)
+ {
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     /* get current map position */
+     gfloat lat, lon;
+     g_object_get(osd->widget, "latitude", &lat, "longitude", &lon, NULL);
+     /* check if position has changed enough to require redraw */
+     if(!isnan(priv->coordinates.lat) && !isnan(priv->coordinates.lon))
+         /* 1/60000 == 1/1000 minute */
+         if((fabsf(lat - priv->coordinates.lat) < 1/60000) &&
+            (fabsf(lon - priv->coordinates.lon) < 1/60000))
+             return;
+     priv->coordinates.lat = lat;
+     priv->coordinates.lon = lon;
+     /* first fill with transparency */
+     cairo_t *cr = cairo_create(priv->coordinates.surface);
+     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+     //    cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 0.5);
+     cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 0.0);
+     cairo_paint(cr);
+     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
-     osm_gps_map_osd_zoom_labels(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
+     cairo_select_font_face (cr, "Sans",
-     osm_gps_map_osd_dpad_labels(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
+                             CAIRO_FONT_SLANT_NORMAL,
-     osm_gps_map_osd_labels_shadow(cr, Z_RAD/3, TRUE);
+                             CAIRO_FONT_WEIGHT_BOLD);
-     osm_gps_map_osd_dpad_gps(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
+     cairo_set_font_size (cr, OSD_COORDINATES_FONT_SIZE);
-     osm_gps_map_osd_labels_shadow(cr, Z_RAD/6, osd->cb != NULL);
+     char *latitude = osd_latitude_str(lat);
-     osm_gps_map_osd_zoom_labels(cr, x, y);
+     char *longitude = osd_longitude_str(lon);
-     osm_gps_map_osd_dpad_labels(cr, x, y);
-     osm_gps_map_osd_labels(cr, Z_RAD/3, TRUE);
+     int y = OSD_COORDINATES_OFFSET;
-     osm_gps_map_osd_dpad_gps(cr, x, y);
+     y = osd_render_centered_text(cr, y, OSD_COORDINATES_W, latitude);
-     osm_gps_map_osd_labels(cr, Z_RAD/6, osd->cb != NULL);
+     y = osd_render_centered_text(cr, y, OSD_COORDINATES_W, longitude);
+     g_free(latitude);
+     g_free(longitude);
      cairo_destroy(cr);
  }
+ #endif  // OSD_COORDINATES
+ #ifdef OSD_NAV
+ #define OSD_NAV_W  (8*OSD_COORDINATES_FONT_SIZE+2*OSD_COORDINATES_OFFSET)
+ #define OSD_NAV_H  (150)
  static void
- osm_gps_map_osd_draw(osm_gps_map_osd_t *osd, gint xoffset, gint yoffset)
+ osd_render_nav(osm_gps_map_osd_t *osd)
  {
      osd_priv_t *priv = (osd_priv_t*)osd->priv;
-     /* backup previous contents */
+     if(!priv->nav.surface || isnan(priv->nav.lat) || isnan(priv->nav.lon))
-     if(!priv->backup)
+         return;
-         priv->backup = gdk_pixmap_new(osd->pixmap, OSD_W+2, OSD_H+2, -1);
-     gint x = OSD_X + xoffset;
+     /* first fill with transparency */
-     gint y = OSD_Y + yoffset;
+     cairo_t *cr = cairo_create(priv->nav.surface);
+     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+     cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.2);
+     cairo_paint(cr);
+     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
-     /* create backup of background */
+     cairo_select_font_face (cr, "Sans",
-     gdk_draw_drawable(priv->backup,
+                             CAIRO_FONT_SLANT_NORMAL,
-         osd->widget->style->fg_gc[GTK_WIDGET_STATE(osd->widget)],
+                             CAIRO_FONT_WEIGHT_BOLD);
-                       osd->pixmap, x-1, y-1, 0, 0, OSD_W+2, OSD_H+2);
+     cairo_set_font_size (cr, OSD_COORDINATES_FONT_SIZE);
-     priv->backup_x = x-1;
+     char *latitude = osd_latitude_str(priv->nav.lat);
-     priv->backup_y = y-1;
+     char *longitude = osd_longitude_str(priv->nav.lon);
+     int y = OSD_COORDINATES_OFFSET;
+     y = osd_render_centered_text(cr, y, OSD_NAV_W, priv->nav.name);
+     y = osd_render_centered_text(cr, y, OSD_NAV_W, latitude);
+     y = osd_render_centered_text(cr, y, OSD_NAV_W, longitude);
+     g_free(latitude);
+     g_free(longitude);
-     /* OSD itself uses some off-screen rendering, so check if the */
+     /* draw the compass */
-     /* offscreen buffer is present and create it if not */
+     int radius = (OSD_NAV_H - y - 5*OSD_COORDINATES_FONT_SIZE/4)/2;
-     if(!priv->overlay) {
+     if(radius > OSD_NAV_W/2)
-         /* create overlay ... */
+         radius = OSD_NAV_W/2;
-         priv->overlay =
-             cairo_image_surface_create(CAIRO_FORMAT_ARGB32, OSD_W, OSD_H);
+     int x = OSD_NAV_W/2+1;
-         /* ... and render it */
+     y += radius;
-         osm_gps_map_osd_render(osd);
+     cairo_stroke (cr);
+     /* draw background */
+     cairo_arc(cr, x, y, radius, 0,  2*M_PI);
+     cairo_set_source_rgba (cr, 1, 1, 1, 0.5);
+     cairo_fill_preserve (cr);
+     cairo_set_source_rgb (cr, 0, 0, 0);
+     cairo_set_line_width (cr, 1);
+     cairo_stroke (cr);
+     /* draw pointer */
+ #define ARROW_WIDTH     0.3
+ #define ARROW_LENGTH    0.7
+     float arot = deg2rad(45);
+     cairo_move_to(cr,
+                   x + radius *  ARROW_LENGTH *  sin(arot),
+                   y + radius *  ARROW_LENGTH * -cos(arot));
+     cairo_line_to(cr,
+                   x + radius * -ARROW_LENGTH *  sin(arot+ARROW_WIDTH),
+                   y + radius * -ARROW_LENGTH * -cos(arot+ARROW_WIDTH));
+     cairo_line_to(cr,
+                   x + radius * -0.5 * ARROW_LENGTH *  sin(arot),
+                   y + radius * -0.5 * ARROW_LENGTH * -cos(arot));
+     cairo_line_to(cr,
+                   x + radius * -ARROW_LENGTH *  sin(arot-ARROW_WIDTH),
+                   y + radius * -ARROW_LENGTH * -cos(arot-ARROW_WIDTH));
+     cairo_close_path(cr);
+     cairo_set_source_rgb (cr, 0, 0, 0);
+     cairo_fill (cr);
+     y += radius + OSD_COORDINATES_FONT_SIZE/4;
+     y = osd_render_centered_text(cr, y, OSD_NAV_W, "xx,xx km");
+     cairo_destroy(cr);
+ }
+ void osm_gps_map_osd_clear_nav (OsmGpsMap *map) {
+     g_return_if_fail (OSM_IS_GPS_MAP (map));
+     osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
+     g_return_if_fail (osd);
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     g_return_if_fail (priv);
+     if(priv->nav.surface) {
+         cairo_surface_destroy(priv->nav.surface);
+         priv->nav.surface = NULL;
+         priv->nav.lat = OSM_GPS_MAP_INVALID;
+         priv->nav.lon = OSM_GPS_MAP_INVALID;
+         if(priv->nav.name) g_free(priv->nav.name);
      }
+     osm_gps_map_redraw(map);
+ }
-     // now draw this onto the original context
+ void
-     cairo_t *cr = gdk_cairo_create(osd->pixmap);
+ osm_gps_map_osd_draw_nav (OsmGpsMap *map, float latitude, float longitude,
-     cairo_set_source_surface(cr, priv->overlay, x, y);
+                           char *name) {
+     g_return_if_fail (OSM_IS_GPS_MAP (map));
+     osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
+     g_return_if_fail (osd);
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     g_return_if_fail (priv);
+     osm_gps_map_osd_clear_nav (map);
+     /* allocate balloon surface */
+     priv->nav.surface =
+         cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+                                    OSD_NAV_W+2, OSD_NAV_H+2);
+     priv->nav.lat = latitude;
+     priv->nav.lon = longitude;
+     priv->nav.name = g_strdup(name);
+     osd_render_nav(osd);
+     osm_gps_map_redraw(map);
+ }
+ #endif // OSD_NAV
+ #ifdef OSD_CROSSHAIR
+ #ifndef OSD_CROSSHAIR_RADIUS
+ #define OSD_CROSSHAIR_RADIUS 10
+ #endif
+ #define OSD_CROSSHAIR_TICK  (OSD_CROSSHAIR_RADIUS/2)
+ #define OSD_CROSSHAIR_BORDER (OSD_CROSSHAIR_TICK + OSD_CROSSHAIR_RADIUS/4)
+ #define OSD_CROSSHAIR_W  ((OSD_CROSSHAIR_RADIUS+OSD_CROSSHAIR_BORDER)*2)
+ #define OSD_CROSSHAIR_H  ((OSD_CROSSHAIR_RADIUS+OSD_CROSSHAIR_BORDER)*2)
+ static void
+ osd_render_crosshair_shape(cairo_t *cr) {
+     cairo_arc (cr, OSD_CROSSHAIR_W/2, OSD_CROSSHAIR_H/2,
+                OSD_CROSSHAIR_RADIUS, 0,  2*M_PI);
+     cairo_move_to (cr, OSD_CROSSHAIR_W/2 - OSD_CROSSHAIR_RADIUS,
+                    OSD_CROSSHAIR_H/2);
+     cairo_rel_line_to (cr, -OSD_CROSSHAIR_TICK, 0);
+     cairo_move_to (cr, OSD_CROSSHAIR_W/2 + OSD_CROSSHAIR_RADIUS,
+                    OSD_CROSSHAIR_H/2);
+     cairo_rel_line_to (cr,  OSD_CROSSHAIR_TICK, 0);
+     cairo_move_to (cr, OSD_CROSSHAIR_W/2,
+                    OSD_CROSSHAIR_H/2 - OSD_CROSSHAIR_RADIUS);
+     cairo_rel_line_to (cr, 0, -OSD_CROSSHAIR_TICK);
+     cairo_move_to (cr, OSD_CROSSHAIR_W/2,
+                    OSD_CROSSHAIR_H/2 + OSD_CROSSHAIR_RADIUS);
+     cairo_rel_line_to (cr, 0, OSD_CROSSHAIR_TICK);
+     cairo_stroke (cr);
+ }
+ static void
+ osd_render_crosshair(osm_gps_map_osd_t *osd)
+ {
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     if(priv->crosshair.rendered)
+         return;
+     priv->crosshair.rendered = TRUE;
+     /* first fill with transparency */
+     cairo_t *cr = cairo_create(priv->crosshair.surface);
+     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+     cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 0.0);
+     cairo_paint(cr);
+     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
+     cairo_set_line_cap  (cr, CAIRO_LINE_CAP_ROUND);
+     cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.5);
+     cairo_set_line_width (cr, OSD_CROSSHAIR_RADIUS/2);
+     osd_render_crosshair_shape(cr);
+     cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.5);
+     cairo_set_line_width (cr, OSD_CROSSHAIR_RADIUS/4);
+     osd_render_crosshair_shape(cr);
+     cairo_destroy(cr);
+ }
+ #endif
+ #ifdef OSD_SCALE
+ #ifndef OSD_SCALE_FONT_SIZE
+ #define OSD_SCALE_FONT_SIZE 12
+ #endif
+ #define OSD_SCALE_W   (10*OSD_SCALE_FONT_SIZE)
+ #define OSD_SCALE_H   (5*OSD_SCALE_FONT_SIZE/2)
+ /* various parameters used to create the scale */
+ #define OSD_SCALE_H2   (OSD_SCALE_H/2)
+ #define OSD_SCALE_TICK (2*OSD_SCALE_FONT_SIZE/3)
+ #define OSD_SCALE_M    (OSD_SCALE_H2 - OSD_SCALE_TICK)
+ #define OSD_SCALE_I    (OSD_SCALE_H2 + OSD_SCALE_TICK)
+ #define OSD_SCALE_FD   (OSD_SCALE_FONT_SIZE/4)
+ static void
+ osd_render_scale(osm_gps_map_osd_t *osd)
+ {
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     /* this only needs to be rendered if the zoom has changed */
+     gint zoom;
+     g_object_get(OSM_GPS_MAP(osd->widget), "zoom", &zoom, NULL);
+     if(zoom == priv->scale.zoom)
+         return;
+     priv->scale.zoom = zoom;
+     float m_per_pix = osm_gps_map_get_scale(OSM_GPS_MAP(osd->widget));
+     /* first fill with transparency */
+     cairo_t *cr = cairo_create(priv->scale.surface);
+     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+     cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
+     // pink for testing:    cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.2);
      cairo_paint(cr);
+     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
+     /* determine the size of the scale width in meters */
+     float width = (OSD_SCALE_W-OSD_SCALE_FONT_SIZE/6) * m_per_pix;
+     /* scale this to useful values */
+     int exp = logf(width)*M_LOG10E;
+     int mant = width/pow(10,exp);
+     int width_metric = mant * pow(10,exp);
+     char *dist_str = NULL;
+     if(width_metric<1000)
+         dist_str = g_strdup_printf("%u m", width_metric);
+     else
+         dist_str = g_strdup_printf("%u km", width_metric/1000);
+     width_metric /= m_per_pix;
+     /* and now the hard part: scale for useful imperial values :-( */
+     /* try to convert to feet, 1ft == 0.3048 m */
+     width /= 0.3048;
+     float imp_scale = 0.3048;
+     char *dist_imp_unit = "ft";
+     if(width >= 100) {
+         /* 1yd == 3 feet */
+         width /= 3.0;
+         imp_scale *= 3.0;
+         dist_imp_unit = "yd";
+         if(width >= 1760.0) {
+             /* 1mi == 1760 yd */
+             width /= 1760.0;
+             imp_scale *= 1760.0;
+             dist_imp_unit = "mi";
+         }
+     }
+     /* also convert this to full tens/hundreds */
+     exp = logf(width)*M_LOG10E;
+     mant = width/pow(10,exp);
+     int width_imp = mant * pow(10,exp);
+     char *dist_str_imp = g_strdup_printf("%u %s", width_imp, dist_imp_unit);
+     /* convert back to pixels */
+     width_imp *= imp_scale;
+     width_imp /= m_per_pix;
+     cairo_select_font_face (cr, "Sans",
+                             CAIRO_FONT_SLANT_NORMAL,
+                             CAIRO_FONT_WEIGHT_BOLD);
+     cairo_set_font_size (cr, OSD_SCALE_FONT_SIZE);
+     cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
+     cairo_text_extents_t extents;
+     cairo_text_extents (cr, dist_str, &extents);
+     cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
+     cairo_set_line_width (cr, OSD_SCALE_FONT_SIZE/6);
+     cairo_move_to (cr, 2*OSD_SCALE_FD, OSD_SCALE_H2-OSD_SCALE_FD);
+     cairo_text_path (cr, dist_str);
+     cairo_stroke (cr);
+     cairo_move_to (cr, 2*OSD_SCALE_FD,
+                    OSD_SCALE_H2+OSD_SCALE_FD + extents.height);
+     cairo_text_path (cr, dist_str_imp);
+     cairo_stroke (cr);
+     cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
+     cairo_move_to (cr, 2*OSD_SCALE_FD, OSD_SCALE_H2-OSD_SCALE_FD);
+     cairo_show_text (cr, dist_str);
+     cairo_move_to (cr, 2*OSD_SCALE_FD,
+                    OSD_SCALE_H2+OSD_SCALE_FD + extents.height);
+     cairo_show_text (cr, dist_str_imp);
+     g_free(dist_str);
+     g_free(dist_str_imp);
+     /* draw white line */
+     cairo_set_line_cap  (cr, CAIRO_LINE_CAP_ROUND);
+     cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0);
+     cairo_set_line_width (cr, OSD_SCALE_FONT_SIZE/3);
+     cairo_move_to (cr, OSD_SCALE_FONT_SIZE/6, OSD_SCALE_M);
+     cairo_rel_line_to (cr, 0,  OSD_SCALE_TICK);
+     cairo_rel_line_to (cr, width_metric, 0);
+     cairo_rel_line_to (cr, 0, -OSD_SCALE_TICK);
+     cairo_stroke(cr);
+     cairo_move_to (cr, OSD_SCALE_FONT_SIZE/6, OSD_SCALE_I);
+     cairo_rel_line_to (cr, 0, -OSD_SCALE_TICK);
+     cairo_rel_line_to (cr, width_imp, 0);
+     cairo_rel_line_to (cr, 0, +OSD_SCALE_TICK);
+     cairo_stroke(cr);
+     /* draw black line */
+     cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
+     cairo_set_line_width (cr, OSD_SCALE_FONT_SIZE/6);
+     cairo_move_to (cr, OSD_SCALE_FONT_SIZE/6, OSD_SCALE_M);
+     cairo_rel_line_to (cr, 0,  OSD_SCALE_TICK);
+     cairo_rel_line_to (cr, width_metric, 0);
+     cairo_rel_line_to (cr, 0, -OSD_SCALE_TICK);
+     cairo_stroke(cr);
+     cairo_move_to (cr, OSD_SCALE_FONT_SIZE/6, OSD_SCALE_I);
+     cairo_rel_line_to (cr, 0, -OSD_SCALE_TICK);
+     cairo_rel_line_to (cr, width_imp, 0);
+     cairo_rel_line_to (cr, 0, +OSD_SCALE_TICK);
+     cairo_stroke(cr);
+     cairo_destroy(cr);
+ }
+ #endif
+ static void
+ osd_render_controls(osm_gps_map_osd_t *osd)
+ {
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     if(priv->controls.rendered
+ #ifdef OSD_GPS_BUTTON
+        && (priv->controls.gps_enabled == (osd->cb != NULL))
+ #endif
+        )
+         return;
+ #ifdef OSD_GPS_BUTTON
+     priv->controls.gps_enabled = (osd->cb != NULL);
+ #endif
+     priv->controls.rendered = TRUE;
+ #ifndef OSD_COLOR
+     GdkColor bg = GTK_WIDGET(osd->widget)->style->bg[GTK_STATE_NORMAL];
+     GdkColor fg = GTK_WIDGET(osd->widget)->style->fg[GTK_STATE_NORMAL];
+     GdkColor da = GTK_WIDGET(osd->widget)->style->fg[GTK_STATE_INSENSITIVE];
+ #endif
+     /* first fill with transparency */
+     cairo_t *cr = cairo_create(priv->controls.surface);
+     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+     cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
+     cairo_paint(cr);
+     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
+     /* --------- draw zoom and dpad shape shadow ----------- */
+ #ifdef OSD_SHADOW_ENABLE
+     osd_zoom_shape(cr, 1+OSD_SHADOW, 1+OSD_SHADOW);
+     osd_shape_shadow(cr);
+ #ifndef OSD_NO_DPAD
+     osd_dpad_shape(cr, 1+OSD_SHADOW, 1+OSD_SHADOW);
+     osd_shape_shadow(cr);
+ #endif
+ #endif
+     /* --------- draw zoom and dpad shape ----------- */
+     osd_zoom_shape(cr, 1, 1);
+ #ifndef OSD_COLOR
+     osd_shape(cr, &bg, &fg);
+ #else
+     osd_shape(cr);
+ #endif
+ #ifndef OSD_NO_DPAD
+     osd_dpad_shape(cr, 1, 1);
+ #ifndef OSD_COLOR
+     osd_shape(cr, &bg, &fg);
+ #else
+     osd_shape(cr);
+ #endif
+ #endif
+     /* --------- draw zoom and dpad labels --------- */
+ #ifdef OSD_SHADOW_ENABLE
+     osd_labels_shadow(cr, Z_RAD/3, TRUE);
+     osd_zoom_labels(cr, 1+OSD_LBL_SHADOW, 1+OSD_LBL_SHADOW);
+ #ifndef OSD_NO_DPAD
+     osd_dpad_labels(cr, 1+OSD_LBL_SHADOW, 1+OSD_LBL_SHADOW);
+ #endif
+     cairo_stroke(cr);
+ #ifdef OSD_GPS_BUTTON
+     osd_labels_shadow(cr, Z_RAD/6, osd->cb != NULL);
+     osd_dpad_gps(cr, 1+OSD_LBL_SHADOW, 1+OSD_LBL_SHADOW);
+     cairo_stroke(cr);
+ #endif
+ #endif
+ #ifndef OSD_COLOR
+     osd_labels(cr, Z_RAD/3, TRUE, &fg, &da);
+ #else
+     osd_labels(cr, Z_RAD/3, TRUE);
+ #endif
+     osd_zoom_labels(cr, 1, 1);
+ #ifndef OSD_NO_DPAD
+     osd_dpad_labels(cr, 1, 1);
+ #endif
+     cairo_stroke(cr);
+ #ifndef OSD_COLOR
+     osd_labels(cr, Z_RAD/6, osd->cb != NULL, &fg, &da);
+ #else
+     osd_labels(cr, Z_RAD/6, osd->cb != NULL);
+ #endif
+ #ifdef OSD_GPS_BUTTON
+     osd_dpad_gps(cr, 1, 1);
+ #endif
+     cairo_stroke(cr);
      cairo_destroy(cr);
  }
  static void
- osm_gps_map_osd_restore (osm_gps_map_osd_t *osd)
+ osd_render(osm_gps_map_osd_t *osd)
+ {
+     /* this function is actually called pretty often since the */
+     /* OSD contents may have changed (due to a coordinate/zoom change). */
+     /* The different OSD parts have to make sure that they don't */
+     /* render unneccessarily often and thus waste CPU power */
+     osd_render_controls(osd);
+ #ifdef OSD_SOURCE_SEL
+     osd_render_source_sel(osd, FALSE);
+ #endif
+ #ifdef OSD_SCALE
+     osd_render_scale(osd);
+ #endif
+ #ifdef OSD_CROSSHAIR
+     osd_render_crosshair(osd);
+ #endif
+ #ifdef OSD_NAV
+     osd_render_nav(osd);
+ #endif
+ #ifdef OSD_COORDINATES
+     osd_render_coordinates(osd);
+ #endif
+ }
+ static void
+ osd_draw(osm_gps_map_osd_t *osd, GdkDrawable *drawable)
  {
      osd_priv_t *priv = (osd_priv_t*)osd->priv;
-     /* restore backup of previous contents */
+     /* OSD itself uses some off-screen rendering, so check if the */
-     if(priv->backup) {
+     /* offscreen buffer is present and create it if not */
-         /* create backup of background */
+     if(!priv->controls.surface) {
-         gdk_draw_drawable(osd->pixmap,
+         /* create overlay ... */
-                           osd->widget->style->fg_gc[GTK_WIDGET_STATE(osd->widget)],
+         priv->controls.surface =
-                           priv->backup, 0, 0,
+             cairo_image_surface_create(CAIRO_FORMAT_ARGB32, OSD_W+2, OSD_H+2);
-                           priv->backup_x, priv->backup_y, OSD_W+2, OSD_H+2);
+         priv->controls.rendered = FALSE;
+ #ifdef OSD_GPS_BUTTON
+         priv->controls.gps_enabled = FALSE;
+ #endif
+ #ifdef OSD_SOURCE_SEL
+         /* the initial OSD state is alway not-expanded */
+         priv->source_sel.surface =
+             cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+                                            OSD_S_W+2, OSD_S_H+2);
+         priv->source_sel.rendered = FALSE;
+ #endif
+ #ifdef OSD_SCALE
+         priv->scale.surface =
+             cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+                                        OSD_SCALE_W, OSD_SCALE_H);
+         priv->scale.zoom = -1;
+ #endif
+ #ifdef OSD_CROSSHAIR
+         priv->crosshair.surface =
+             cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+                                        OSD_CROSSHAIR_W, OSD_CROSSHAIR_H);
+         priv->crosshair.rendered = FALSE;
+ #endif
+ #ifdef OSD_COORDINATES
+         priv->coordinates.surface =
+             cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+                                        OSD_COORDINATES_W, OSD_COORDINATES_H);
+         priv->coordinates.lat = priv->coordinates.lon = OSM_GPS_MAP_INVALID;
+ #endif
+         /* ... and render it */
+         osd_render(osd);
+     }
+     // now draw this onto the original context
+     cairo_t *cr = gdk_cairo_create(drawable);
+     gint x, y;
+ #ifdef OSD_SCALE
+     x =  OSD_X;
+     y = -OSD_Y;
+     if(x < 0) x += osd->widget->allocation.width - OSD_SCALE_W;
+     if(y < 0) y += osd->widget->allocation.height - OSD_SCALE_H;
+     cairo_set_source_surface(cr, priv->scale.surface, x, y);
+     cairo_paint(cr);
+ #endif
+ #ifdef OSD_CROSSHAIR
+     x = (osd->widget->allocation.width - OSD_CROSSHAIR_W)/2;
+     y = (osd->widget->allocation.height - OSD_CROSSHAIR_H)/2;
+     cairo_set_source_surface(cr, priv->crosshair.surface, x, y);
+     cairo_paint(cr);
+ #endif
+ #ifdef OSD_NAV
+     if(priv->nav.surface) {
+         x =  OSD_X;
+         if(x < 0) x += osd->widget->allocation.width - OSD_NAV_W;
+         y = (osd->widget->allocation.height - OSD_NAV_H)/2;
+         cairo_set_source_surface(cr, priv->nav.surface, x, y);
+         cairo_paint(cr);
      }
+ #endif
+ #ifdef OSD_COORDINATES
+     x = -OSD_X;
+     y = -OSD_Y;
+     if(x < 0) x += osd->widget->allocation.width - OSD_COORDINATES_W;
+     if(y < 0) y += osd->widget->allocation.height - OSD_COORDINATES_H;
+     cairo_set_source_surface(cr, priv->coordinates.surface, x, y);
+     cairo_paint(cr);
+ #endif
+ #ifdef OSD_BALLOON
+     if(priv->balloon.surface) {
+         /* convert given lat lon into screen coordinates */
+         gint x, y;
+         osm_gps_map_geographic_to_screen (OSM_GPS_MAP(osd->widget),
+                                       priv->balloon.lat, priv->balloon.lon,
+                                       &x, &y);
+         /* check if balloon needs to be rerendered */
+         osd_render_balloon(osd);
+         cairo_set_source_surface(cr, priv->balloon.surface,
+                                  x + priv->balloon.offset_x,
+                                  y + priv->balloon.offset_y);
+         cairo_paint(cr);
+     }
+ #endif
+     x = OSD_X;
+     if(x < 0)
+         x += osd->widget->allocation.width - OSD_W;
+     y = OSD_Y;
+     if(y < 0)
+         y += osd->widget->allocation.height - OSD_H;
+     cairo_set_source_surface(cr, priv->controls.surface, x, y);
+     cairo_paint(cr);
+ #ifdef OSD_SOURCE_SEL
+     if(!priv->source_sel.handler_id) {
+         /* the OSD source selection is not being animated */
+         if(!priv->source_sel.expanded)
+             x = osd->widget->allocation.width - OSD_S_W;
+         else
+             x = osd->widget->allocation.width - OSD_S_EXP_W + OSD_S_X;
+     } else
+         x = priv->source_sel.shift;
+     y = OSD_S_Y;
+     if(OSD_S_Y < 0) {
+         if(!priv->source_sel.expanded)
+             y = osd->widget->allocation.height - OSD_S_H + OSD_S_Y;
+         else
+             y = osd->widget->allocation.height - OSD_S_EXP_H + OSD_S_Y;
+     }
+     cairo_set_source_surface(cr, priv->source_sel.surface, x, y);
+     cairo_paint(cr);
+ #endif
+     cairo_destroy(cr);
  }
  static void
- osm_gps_map_osd_free(osm_gps_map_osd_t *osd)
+ osd_free(osm_gps_map_osd_t *osd)
  {
      osd_priv_t *priv = (osd_priv_t *)(osd->priv);
-     if (priv->backup)
+     if (priv->controls.surface)
-         g_object_unref(priv->backup);
+          cairo_surface_destroy(priv->controls.surface);
+ #ifdef OSD_SOURCE_SEL
+     if(priv->source_sel.handler_id)
+         gtk_timeout_remove(priv->source_sel.handler_id);
+     if (priv->source_sel.surface)
+          cairo_surface_destroy(priv->source_sel.surface);
+ #endif
-     if (priv->overlay)
+ #ifdef OSD_SCALE
-          cairo_surface_destroy(priv->overlay);
+     if (priv->scale.surface)
+          cairo_surface_destroy(priv->scale.surface);
+ #endif
+ #ifdef OSD_CROSSHAIR
+     if (priv->crosshair.surface)
+          cairo_surface_destroy(priv->crosshair.surface);
+ #endif
+ #ifdef OSD_NAV
+     if (priv->nav.surface)
+          cairo_surface_destroy(priv->nav.surface);
+ #endif
+ #ifdef OSD_COORDINATES
+     if (priv->coordinates.surface)
+          cairo_surface_destroy(priv->coordinates.surface);
+ #endif
+ #ifdef OSD_BALLOON
+     if (priv->balloon.surface)
+          cairo_surface_destroy(priv->balloon.surface);
+ #endif
      g_free(priv);
  }
+ static gboolean
+ osd_busy(osm_gps_map_osd_t *osd)
+ {
+ #ifdef OSD_SOURCE_SEL
+     osd_priv_t *priv = (osd_priv_t *)(osd->priv);
+     return (priv->source_sel.handler_id != 0);
+ #else
+     return FALSE;
+ #endif
+ }
  static osm_gps_map_osd_t osd_classic = {
-     .restore    = osm_gps_map_osd_restore,
+     .widget     = NULL,
-     .draw       = osm_gps_map_osd_draw,
-     .check      = osm_gps_map_osd_check,
+     .draw       = osd_draw,
-     .render     = osm_gps_map_osd_render,
+     .check      = osd_check,
-     .free       = osm_gps_map_osd_free,
+     .render     = osd_render,
+     .free       = osd_free,
+     .busy       = osd_busy,
      .cb         = NULL,
      .data       = NULL,
-Line 399 
 osm_gps_map_osd_classic_init(OsmGpsMap *
+Line 1903 
 osm_gps_map_osd_classic_init(OsmGpsMap *
  {
      osd_priv_t *priv = osd_classic.priv = g_new0(osd_priv_t, 1);
+ #ifdef OSD_BALLOON
+     priv->balloon.lat = OSM_GPS_MAP_INVALID;
+     priv->balloon.lon = OSM_GPS_MAP_INVALID;
+ #endif
      osd_classic.priv = priv;
      osm_gps_map_register_osd(map, &osd_classic);
  }
+ #ifdef OSD_GPS_BUTTON
- void osm_gps_map_osd_enable_gps (OsmGpsMap *map, OsmGpsMapOsdCallback cb, gpointer data) {
+ /* below are osd specific functions which aren't used by osm-gps-map */
+ /* but instead are to be used by the main application */
+ void osm_gps_map_osd_enable_gps (OsmGpsMap *map, OsmGpsMapOsdCallback cb,
+                                  gpointer data) {
      osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
      g_return_if_fail (osd);
      osd->cb = cb;
-Line 419 
 void osm_gps_map_osd_enable_gps (OsmGpsM
+Line 1930 
 void osm_gps_map_osd_enable_gps (OsmGpsM
      osm_gps_map_redraw(map);
  }
+ #endif
+ osd_button_t
+ osm_gps_map_osd_check(OsmGpsMap *map, gint x, gint y) {
+     osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
+     g_return_val_if_fail (osd, OSD_NONE);
+     return osd_check(osd, TRUE, x, y);
+ }

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Added in v.131
-Removed from v.73
+Added in v.131