lcd-common/scroll_engine: Introduce lcd_putsxy_scroll_func().

This function supports installing a custom scroll callback. This will be
called when the scrollengine redraws the line. It allows to draw extended
styles (or anything your can possible imagine) along with the text.

It is also strictly pixel-based, the first pixel-based function that supports
scrolling.

Change-Id: I57f81ac7b3d08b877aea4cb8afa882f175ebcdfc

1 files changed, 4 insertions, 0 deletions

diff --git a/apps/screen_access.h b/apps/screen_access.h
index 90b63ea338..210ad2e990 100644
--- a/apps/screen_access.h
+++ b/apps/screen_access.h
@@ -24,6 +24,7 @@
 
 #include "lcd.h"
 #include "buttonbar.h"
+#include "scroll_engine.h"
 #include "backdrop.h"
 
 #if defined(HAVE_REMOTE_LCD) && !defined (ROCKBOX_HAS_LOGF)
@@ -143,6 +144,9 @@ struct screen
     void (*puts_scroll)(int x, int y, const unsigned char *string);
     void (*puts_scroll_offset)(int x, int y, const unsigned char *string,
                                  int x_offset);
+    void (*putsxy_scroll_func)(int x, int y, const unsigned char *string,
+                               void (*scroll_func)(struct scrollinfo *),
+                               void *data, int x_offset);
     void (*scroll_speed)(int speed);
     void (*scroll_delay)(int ms);
     void (*clear_display)(void);