expo: Support simple themes

It is a pain to manually set the fonts of all objects to be consistent.
Some spacing settings are also better set globally than by manually
positioning each object.

Add a 'theme' to the expo, to hold this information. For now it includes
only the font size.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/boot/scene.c b/boot/scene.c
index 6d5e3c1f03..4dbe12a2b7 100644
--- a/boot/scene.c
+++ b/boot/scene.c
@@ -466,3 +466,31 @@ int scene_calc_dims(struct scene *scn, bool do_menus)
 
 	return 0;
 }
+
+int scene_apply_theme(struct scene *scn, struct expo_theme *theme)
+{
+	struct scene_obj *obj;
+	int ret;
+
+	/* Avoid error-checking optional items */
+	scene_txt_set_font(scn, scn->title_id, NULL, theme->font_size);
+
+	list_for_each_entry(obj, &scn->obj_head, sibling) {
+		switch (obj->type) {
+		case SCENEOBJT_NONE:
+		case SCENEOBJT_IMAGE:
+		case SCENEOBJT_MENU:
+			break;
+		case SCENEOBJT_TEXT:
+			scene_txt_set_font(scn, obj->id, NULL,
+					   theme->font_size);
+			break;
+		}
+	}
+
+	ret = scene_arrange(scn);
+	if (ret)
+		return log_msg_ret("arr", ret);
+
+	return 0;
+}