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, 5 insertions, 0 deletions

diff --git a/firmware/export/lcd.h b/firmware/export/lcd.h
index 7842ce59f2..745c445dda 100644
--- a/firmware/export/lcd.h
+++ b/firmware/export/lcd.h
@@ -108,6 +108,8 @@ enum screen_type {
 #endif
 };
 
+struct scrollinfo;
+
 #if   defined(LCD_STRIDEFORMAT) && LCD_STRIDEFORMAT == VERTICAL_STRIDE
 #define STRIDE_MAIN(w, h)   (h)
 #else
@@ -212,6 +214,9 @@ extern void lcd_putc(int x, int y, unsigned long ucs);
 extern void lcd_puts_scroll(int x, int y, const unsigned char* string);
 extern void lcd_puts_scroll_style(int x, int y, const unsigned char* string,
                                   int style);
+extern void lcd_putsxy_scroll_func(int x, int y, const unsigned char *string,
+                                   void (*scroll_func)(struct scrollinfo *),
+                                   void *data, int x_offset);
 
 #ifdef HAVE_LCD_BITMAP