1 files changed, 92 insertions, 0 deletions

diff --git a/firmware/export/scroll_engine.h b/firmware/export/scroll_engine.h
new file mode 100644
index 0000000000..aa11a9ba1f
--- /dev/null
+++ b/firmware/export/scroll_engine.h
@@ -0,0 +1,92 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2007 Michael Sevakis
+ *
+ * LCD scrolling driver and scheduler
+ *
+ * Much collected and combined from the various Rockbox LCD drivers.
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef __SCROLL_ENGINE_H__
+#define __SCROLL_ENGINE_H__
+
+void scroll_init(void);
+void lcd_scroll_fn(void);
+void lcd_remote_scroll_fn(void);
+
+/* internal usage, but in multiple drivers */
+#define SCROLL_SPACING   3
+#ifdef HAVE_LCD_BITMAP
+#define SCROLL_LINE_SIZE (MAX_PATH + SCROLL_SPACING + 3*LCD_WIDTH/2 + 2)
+#else
+#define SCROLL_LINE_SIZE (MAX_PATH + SCROLL_SPACING + 3*LCD_WIDTH + 2)
+#endif
+
+struct scrollinfo
+{
+    char line[SCROLL_LINE_SIZE];
+    int len;    /* length of line in chars */
+    int offset;
+    int startx;
+#ifdef HAVE_LCD_BITMAP
+    int width;  /* length of line in pixels */
+    bool invert; /* invert the scrolled text */
+#endif
+    bool backward; /* scroll presently forward or backward? */
+    bool bidir;
+    long start_tick;
+#ifdef HAVE_LCD_COLOR
+    int line_color;
+#endif
+};
+
+struct scroll_screen_info
+{
+    struct scrollinfo * const scroll;
+    const int num_scroll; /* number of scrollable lines (also number of scroll structs) */
+    int lines;  /* Bitpattern of which lines are scrolling */
+    long ticks; /* # of ticks between updates*/
+    long delay; /* ticks delay before start */
+    int bidir_limit;  /* percent */
+#ifdef HAVE_LCD_CHARCELLS
+    long jump_scroll_delay; /* delay between jump scroll jumps */
+    int jump_scroll; /* 0=off, 1=once, ..., JUMP_SCROLL_ALWAYS */
+#endif
+#if defined(HAVE_LCD_BITMAP) || defined(HAVE_REMOTE_LCD)
+    int step;  /* pixels per scroll step */
+#endif
+#if defined(HAVE_REMOTE_LCD)
+    long last_scroll;
+#endif
+};
+
+/** main lcd **/
+#ifdef HAVE_LCD_BITMAP
+#define LCD_SCROLLABLE_LINES ((LCD_HEIGHT+4)/5 < 32 ? (LCD_HEIGHT+4)/5 : 32)
+#else
+#define LCD_SCROLLABLE_LINES LCD_HEIGHT
+#endif
+
+extern struct scroll_screen_info lcd_scroll_info;
+
+/** remote lcd **/
+#ifdef HAVE_REMOTE_LCD
+#define LCD_REMOTE_SCROLLABLE_LINES \
+    (((LCD_REMOTE_HEIGHT+4)/5 < 32) ? (LCD_REMOTE_HEIGHT+4)/5 : 32)
+extern struct scroll_screen_info lcd_remote_scroll_info;
+#endif
+
+#endif /* __SCROLL_ENGINE_H__ */