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/***************************************************************************
* __________ __ ___.
* 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.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* 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__
#include <stdbool.h>
#include "config.h"
#include "file.h"
struct viewport;
struct scrollinfo;
extern void scroll_init(void) INIT_ATTR;
extern void lcd_bidir_scroll(int threshold);
extern void lcd_scroll_speed(int speed);
extern void lcd_scroll_delay(int ms);
extern void lcd_scroll_stop(void);
extern void lcd_scroll_stop_viewport(const struct viewport *vp);
extern void lcd_scroll_stop_viewport_rect(const struct viewport *vp, int x, int y, int width, int height);
extern bool lcd_scroll_now(struct scrollinfo *scroll);
#ifdef HAVE_REMOTE_LCD
extern void lcd_remote_scroll_speed(int speed);
extern void lcd_remote_scroll_delay(int ms);
extern void lcd_remote_scroll_stop(void);
extern void lcd_remote_scroll_stop_viewport(const struct viewport *vp);
extern void lcd_remote_scroll_stop_viewport_rect(const struct viewport *vp, int x, int y, int width, int height);
extern bool lcd_remote_scroll_now(struct scrollinfo *scroll);
#endif
/* internal usage, but in multiple drivers
* larger than the normal linebuffer since it holds the line a second
* time (+3 spaces) for non-bidir scrolling */
#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
{
struct viewport* vp;
char linebuffer[(SCROLL_LINE_SIZE / 2) - 1];
const char *line;
/* rectangle for the line */
int x, y; /* relative to the viewort */
int width, height;
/* pixel to skip from the beginning of the string, increments as the text scrolls */
int offset;
/* scroll presently forward or backward? */
bool backward;
bool bidir;
long start_tick;
/* support for custom scrolling functions,
* must be called with ::line == NULL to indicate that the line
* stops scrolling or when the userdata pointer is going to be changed
* (the custom scroller can release the userdata then) */
void (*scroll_func)(struct scrollinfo *s);
void *userdata;
};
struct scroll_screen_info
{
struct scrollinfo * const scroll;
const int num_scroll; /* number of scrollable lines (also number of scroll structs) */
int lines; /* Number of currently scrolling lines */
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 * 2
#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__ */
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