Bidirectional scroll ala recorder.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@3080 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 8 insertions, 2 deletions

diff --git a/firmware/drivers/lcd-player.c b/firmware/drivers/lcd-player.c
index 23dc774e83..ea759544eb 100644
--- a/firmware/drivers/lcd-player.c
+++ b/firmware/drivers/lcd-player.c
@@ -79,6 +79,7 @@ static char scroll_speed = 8; /* updates per second */
 static int scroll_delay = HZ/2; /* delay before starting scroll */
 static char scroll_spacing = 3; /* spaces between end and start of text */
 static bool allow_bidirectional_scrolling = true;
+static int bidir_limit = 50;  /* percent */
 
 static struct scrollinfo scroll[SCROLLABLE_LINES];
 
@@ -442,6 +443,11 @@ void lcd_init (void)
                   sizeof(scroll_stack), scroll_name);
 }
 
+void lcd_bidir_scroll(int percent)
+{
+    bidir_limit = percent;
+}
+
 void lcd_puts_scroll(int x, int y, unsigned char* string )
 {
     struct scrollinfo* s;
@@ -463,7 +469,7 @@ void lcd_puts_scroll(int x, int y, unsigned char* string )
         s->direction=+1;
         strncpy(s->text,string,sizeof s->text);
         s->turn_offset=-1;
-        if (allow_bidirectional_scrolling && s->textlen + x > 11+4) {
+        if (bidir_limit && (s->textlen < ((11-x)*(100+bidir_limit))/100)) {
             s->turn_offset=s->textlen+x-11;
         } else {
             for (i=0; i<scroll_spacing && s->textlen<(int)sizeof(s->text); i++) {
diff --git a/firmware/drivers/lcd.h b/firmware/drivers/lcd.h
index 8c57aa9f05..a4d8178b87 100644
--- a/firmware/drivers/lcd.h
+++ b/firmware/drivers/lcd.h
@@ -88,7 +88,7 @@ extern void lcd_double_height (bool on);
 unsigned char lcd_get_locked_pattern(void);
 void lcd_unlock_pattern(unsigned char pat);
 void lcd_allow_bidirectional_scrolling(bool on);
-
+extern void lcd_bidir_scroll(int threshold);
 #endif
 
 #if defined(HAVE_LCD_BITMAP) || defined(SIMULATOR)