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

apps/screen_access.c

@@ -25,7 +25,7 @@
 #ifdef HAVE_REMOTE_LCD
 #include <lcd-remote.h>
 #endif
-#include <scroll_engine.h>
+#include "scroll_engine.h"
 #include <font.h>
 #include <button.h>
 #include <settings.h>
@@ -243,6 +243,7 @@ struct screen screens[NB_SCREENS] =
         .puts_offset=&lcd_puts_offset,
         .puts_scroll=&lcd_puts_scroll,
         .puts_scroll_offset=&lcd_puts_scroll_offset,
+        .putsxy_scroll_func=&lcd_putsxy_scroll_func,
         .scroll_speed=&lcd_scroll_speed,
         .scroll_delay=&lcd_scroll_delay,
         .clear_display=&lcd_clear_display,
@@ -344,6 +345,7 @@ struct screen screens[NB_SCREENS] =
         .puts_offset=&lcd_remote_puts_offset,
         .puts_scroll=&lcd_remote_puts_scroll,
         .puts_scroll_offset=&lcd_remote_puts_scroll_offset,
+        .putsxy_scroll_func=&lcd_remote_putsxy_scroll_func,
         .scroll_speed=&lcd_remote_scroll_speed,
         .scroll_delay=&lcd_remote_scroll_delay,
         .clear_display=&lcd_remote_clear_display,

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);

firmware/drivers/lcd-bitmap-common.c

@@ -572,6 +572,17 @@ void LCDFN(puts_scroll_style_xyoffset)(int x, int y, const unsigned char *string
                               true, LCDFN(scroll_fn), NULL);
 }
 
+void LCDFN(putsxy_scroll_func)(int x, int y, const unsigned char *string,
+                                     void (*scroll_func)(struct scrollinfo *),
+                                     void *data, int x_offset)
+{
+    if (!scroll_func)
+        LCDFN(putsxyofs)(x, y, x_offset, string);
+    else
+        LCDFN(puts_scroll_worker)(x, y, string, STYLE_NONE, x_offset, 0,
+                              false, scroll_func, data);
+}
+
 void LCDFN(puts_scroll)(int x, int y, const unsigned char *string)
 {
     LCDFN(puts_scroll_style)(x, y, string, STYLE_DEFAULT);

firmware/drivers/lcd-charcell.c

@@ -563,6 +563,16 @@ void lcd_puts_scroll_worker(int x, int y, const unsigned char *string,
     lcd_scroll_info.lines++;
 }
 
+void lcd_putsxy_scroll_func(int x, int y, const unsigned char *string,
+                                     void (*scroll_func)(struct scrollinfo *),
+                                     void *data, int x_offset)
+{
+    if (!scroll_func)
+        lcd_putsxyofs(x, y, x_offset, string);
+    else
+        lcd_puts_scroll_worker(x, y, string, x_offset, scroll_func, data);
+}
+
 void lcd_scroll_fn(struct scrollinfo* s)
 {
     lcd_putsxyofs(s->x, s->y, s->offset, s->line);

firmware/export/lcd-remote.h

@@ -196,6 +196,9 @@ extern void lcd_remote_puts_scroll_style_xyoffset(int x, int y,
                                                   const unsigned char *string,
                                                   int style, int x_offset,
                                                   int y_offset);
+extern void lcd_remote_putsxy_scroll_func(int x, int y, const unsigned char *string,
+                                          void (*scroll_func)(struct scrollinfo *),
+                                          void *data, int x_offset);
 
 extern void lcd_remote_update(void);
 extern void lcd_remote_update_rect(int x, int y, int width, int height);

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