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, 20 insertions, 0 deletions

diff --git a/boot/expo.c b/boot/expo.c
index 67cae3c7e2..d5e935966b 100644
--- a/boot/expo.c
+++ b/boot/expo.c
@@ -231,3 +231,23 @@ int expo_action_get(struct expo *exp, struct expo_action *act)
 
 	return act->type == EXPOACT_NONE ? -EAGAIN : 0;
 }
+
+int expo_apply_theme(struct expo *exp, ofnode node)
+{
+	struct scene *scn;
+	struct expo_theme *theme = &exp->theme;
+	int ret;
+
+	log_debug("Applying theme %s\n", ofnode_get_name(node));
+
+	memset(theme, '\0', sizeof(struct expo_theme));
+	ofnode_read_u32(node, "font-size", &theme->font_size);
+
+	list_for_each_entry(scn, &exp->scene_head, sibling) {
+		ret = scene_apply_theme(scn, theme);
+		if (ret)
+			return log_msg_ret("app", ret);
+	}
+
+	return 0;
+}