scroll engine: Factor out renderer function so it can be called by lcd code.

This is used by lcd_puts_scroll_worker() to render the line immediately
instead of waiting for the next scroll tick when only the text was updated.
Previously lcd_puts_scroll_worker() did not render anything in this case
which could lead to visible blinking.

This fixes blinking scrolling lines with dynamic text in the skin engine.

Change-Id: I475bde8c8eb7c92f505e3c5ecf4d32bb90690536

1 files changed, 5 insertions, 0 deletions

diff --git a/firmware/export/scroll_engine.h b/firmware/export/scroll_engine.h
index 19a2bc4cca..64e1d6d6ae 100644
--- a/firmware/export/scroll_engine.h
+++ b/firmware/export/scroll_engine.h
@@ -30,6 +30,7 @@
 #include "file.h"
 
 struct viewport;
+struct scrollinfo;
 
 extern void scroll_init(void) INIT_ATTR;
 
@@ -40,6 +41,7 @@ extern void lcd_scroll_delay(int ms);
 extern void lcd_scroll_stop(void);
 extern void lcd_scroll_stop_viewport(const struct viewport *vp);
 extern void lcd_scroll_stop_viewport_rect(const struct viewport *vp, int x, int y, int width, int height);
+extern bool lcd_scroll_now(struct scrollinfo *scroll);
 #ifdef HAVE_REMOTE_LCD
 extern void lcd_remote_scroll_speed(int speed);
 extern void lcd_remote_scroll_delay(int ms);
@@ -47,8 +49,11 @@ extern void lcd_remote_scroll_delay(int ms);
 extern void lcd_remote_scroll_stop(void);
 extern void lcd_remote_scroll_stop_viewport(const struct viewport *vp);
 extern void lcd_remote_scroll_stop_viewport_rect(const struct viewport *vp, int x, int y, int width, int height);
+extern bool lcd_remote_scroll_now(struct scrollinfo *scroll);
 #endif
 
+
+
 /* internal usage, but in multiple drivers
  * larger than the normal linebuffer since it holds the line a second
  * time (+3 spaces) for non-bidir scrolling */