Start work on info overlays

diff --git a/src/plugins/env.c b/src/plugins/env.c
index 4691870f873438f125d0d0cfd7bd23a67088949b..8b16466e22a4d5894c81bcecf0996fd1ee92d1dd 100644 (file)
--- a/src/plugins/env.c
+++ b/src/plugins/env.c
@@ -223,6 +223,84 @@ static gboolean compass_click(GritsCallback *compass, GdkEvent *evnet, GritsView
        return TRUE;
 }
 
+/* Info */
+static void info_expose(GritsCallback *compass, GritsOpenGL *opengl, gpointer _env)
+{
+       gint win_width  = GTK_WIDGET(opengl)->allocation.width;
+       gint win_height = GTK_WIDGET(opengl)->allocation.height;
+
+       /* Create cairo  surface */
+       guint            tex     = 0;
+       const gchar     *label0  = "Location: %7.3lf°, %8.3lf°, %4.0fm";
+       const gchar     *label1  = "Cursor:   %7.3lf°, %8.3lf°, %4.0fm";
+       gdouble          width   = 300;
+       gdouble          height  = 200;
+       cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
+       cairo_t         *cairo   = cairo_create(surface);
+
+       /* Text */
+       gdouble lat, lon, elev;
+       grits_viewer_get_location(GRITS_VIEWER(opengl), &lat, &lon, &elev);
+       gchar *text0 = g_strdup_printf(label0, lat, lon, elev);
+       gchar *text1 = g_strdup_printf(label1, lat, lon, elev);
+
+       /* Draw outline */
+       cairo_set_line_width(cairo, 3);
+       cairo_set_source_rgba(cairo, 0, 0, 0, 0.75);
+       cairo_move_to(cairo, 2, 20); cairo_text_path(cairo, text0);
+       cairo_move_to(cairo, 2, 40); cairo_text_path(cairo, text1);
+       cairo_stroke(cairo);
+
+       /* Draw filler */
+       cairo_set_source_rgba(cairo, 1, 1, 1, 1);
+       cairo_move_to(cairo, 2, 20); cairo_show_text(cairo, text0);
+       cairo_move_to(cairo, 2, 40); cairo_show_text(cairo, text1);
+
+       /* Setup pango */
+       PangoLayout          *layout = pango_cairo_create_layout(cairo);
+       PangoFontDescription *font   = pango_font_description_from_string("Mono 9");
+       pango_layout_set_font_description(layout, font);
+       pango_font_description_free(font);
+       pango_layout_set_text(layout, text0, -1);
+       pango_cairo_update_layout(cairo, layout);
+       cairo_set_line_join(cairo, CAIRO_LINE_JOIN_ROUND);
+       cairo_move_to(cairo, 2, 40);
+       pango_cairo_layout_path(cairo, layout);
+       for (float w = 0.2; w <= 0.8; w+=0.2) {
+               cairo_set_line_width(cairo, (1-w)*8);
+               cairo_set_source_rgba(cairo, 0, 0, 0, w);
+               cairo_stroke_preserve(cairo);
+       }
+       cairo_set_source_rgba(cairo, 1, 1, 1, 1);
+       pango_cairo_show_layout(cairo, layout);
+
+       /* Load GL texture */
+       glEnable(GL_TEXTURE_2D);
+       glGenTextures(1, &tex);
+       glBindTexture(GL_TEXTURE_2D, tex);
+       glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+       glPixelStorei(GL_PACK_ALIGNMENT, 1);
+       glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height,
+               0, GL_BGRA, GL_UNSIGNED_BYTE, cairo_image_surface_get_data(surface));
+       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+
+       /* Draw surface */
+       glDisable(GL_LIGHTING);
+       glDisable(GL_COLOR_MATERIAL);
+       glDisable(GL_DEPTH_TEST);
+       glEnable(GL_TEXTURE_2D);
+       glBindTexture(GL_TEXTURE_2D, tex);
+       glDisable(GL_CULL_FACE);
+       glTranslatef(win_width - width, win_height - height, 0);
+       glBegin(GL_QUADS);
+       glTexCoord2f(1, 0); glVertex3f(width, 0     , 0); // 0 - 3    0
+       glTexCoord2f(1, 1); glVertex3f(width, height, 0); // 1 - |    |
+       glTexCoord2f(0, 1); glVertex3f(0    , height, 0); // 2 - |    |
+       glTexCoord2f(0, 0); glVertex3f(0    , 0     , 0); // 3 - 2----1
+       glEnd();
+}
+
 /***********
  * Methods *
  ***********/
@@ -254,6 +332,12 @@ GritsPluginEnv *grits_plugin_env_new(GritsViewer *viewer, GritsPrefs *prefs)
        grits_object_set_cursor(GRITS_OBJECT(compass), GDK_CROSS);
        env->refs = g_list_prepend(env->refs, compass);
 
+       /* Add info */
+       //GritsCallback *info = grits_callback_new(info_expose, env);
+       //grits_viewer_add(viewer, GRITS_OBJECT(info), GRITS_LEVEL_HUD, FALSE);
+       //env->refs = g_list_prepend(env->refs, info);
+       (void)info_expose;
+
        /* Add background */
        //GritsTile *background = grits_tile_new(NULL, NORTH, SOUTH, EAST, WEST);
        //glGenTextures(1, &env->tex);