113 lines
3.9 KiB
C
113 lines
3.9 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2007 Michael Sevakis
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*
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* LCD scrolling driver and scheduler
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*
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* Much collected and combined from the various Rockbox LCD drivers.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __SCROLL_ENGINE_H__
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#define __SCROLL_ENGINE_H__
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#include <stdbool.h>
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#include "config.h"
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#include "file.h"
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struct viewport;
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struct scrollinfo;
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extern void scroll_init(void) INIT_ATTR;
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extern void lcd_bidir_scroll(int threshold);
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extern void lcd_scroll_speed(int speed);
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extern void lcd_scroll_delay(int ms);
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extern void lcd_scroll_stop(void);
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extern void lcd_scroll_stop_viewport(const struct viewport *vp);
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extern void lcd_scroll_stop_viewport_rect(const struct viewport *vp, int x, int y, int width, int height);
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extern bool lcd_scroll_now(struct scrollinfo *scroll);
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#ifdef HAVE_REMOTE_LCD
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extern void lcd_remote_scroll_speed(int speed);
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extern void lcd_remote_scroll_delay(int ms);
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extern void lcd_remote_scroll_stop(void);
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extern void lcd_remote_scroll_stop_viewport(const struct viewport *vp);
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extern void lcd_remote_scroll_stop_viewport_rect(const struct viewport *vp, int x, int y, int width, int height);
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extern bool lcd_remote_scroll_now(struct scrollinfo *scroll);
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#endif
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/* internal usage, but in multiple drivers
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* larger than the normal linebuffer since it holds the line a second
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* time (+3 spaces) for non-bidir scrolling */
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#define SCROLL_SPACING 3
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#define SCROLL_LINE_SIZE (MAX_PATH + SCROLL_SPACING + 3*LCD_WIDTH/2 + 2)
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struct scrollinfo
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{
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struct viewport* vp;
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char linebuffer[(SCROLL_LINE_SIZE / 2) - SCROLL_SPACING];
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const char *line;
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/* rectangle for the line */
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int x, y; /* relative to the viewort */
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int width, height;
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/* pixel to skip from the beginning of the string, increments as the text scrolls */
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int offset;
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/* scroll presently forward or backward? */
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bool backward;
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bool bidir;
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long start_tick;
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/* support for custom scrolling functions,
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* must be called with ::line == NULL to indicate that the line
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* stops scrolling or when the userdata pointer is going to be changed
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* (the custom scroller can release the userdata then) */
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void (*scroll_func)(struct scrollinfo *s);
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void *userdata;
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};
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struct scroll_screen_info
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{
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struct scrollinfo * const scroll;
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const int num_scroll; /* number of scrollable lines (also number of scroll structs) */
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int lines; /* Number of currently scrolling lines */
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long ticks; /* # of ticks between updates*/
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long delay; /* ticks delay before start */
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int bidir_limit; /* percent */
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int step; /* pixels per scroll step */
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#if defined(HAVE_REMOTE_LCD)
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long last_scroll;
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#endif
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};
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/** main lcd **/
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#define LCD_SCROLLABLE_LINES ((LCD_HEIGHT+4)/5 < 32 ? (LCD_HEIGHT+4)/5 : 32)
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extern struct scroll_screen_info lcd_scroll_info;
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/** remote lcd **/
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#ifdef HAVE_REMOTE_LCD
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#define LCD_REMOTE_SCROLLABLE_LINES \
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(((LCD_REMOTE_HEIGHT+4)/5 < 32) ? (LCD_REMOTE_HEIGHT+4)/5 : 32)
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extern struct scroll_screen_info lcd_remote_scroll_info;
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#endif
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#endif /* __SCROLL_ENGINE_H__ */
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