d9d0b4dd20
Looks much smoother now as you don't scroll by whole lines anymore. Add some functions lcd driver to enable the line based scrolling engine to draw the lines with a pixel-based y-offset. This should also allow for a sensible kinetic scrolling mechanism (still a todo). git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28214 a1c6a512-1295-4272-9138-f99709370657
105 lines
3.4 KiB
C
105 lines
3.4 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 <lcd.h>
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#include "file.h"
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void scroll_init(void) INIT_ATTR;
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void lcd_scroll_stop(const struct viewport* vp);
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void lcd_scroll_stop_line(const struct viewport* vp, int y);
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void lcd_scroll_fn(void);
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#ifdef HAVE_REMOTE_LCD
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void lcd_remote_scroll_fn(void);
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void lcd_remote_scroll_stop(const struct viewport* vp);
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void lcd_remote_scroll_stop_line(const struct viewport* vp, int y);
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#endif
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/* internal usage, but in multiple drivers */
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#define SCROLL_SPACING 3
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#ifdef HAVE_LCD_BITMAP
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#define SCROLL_LINE_SIZE (MAX_PATH + SCROLL_SPACING + 3*LCD_WIDTH/2 + 2)
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#else
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#define SCROLL_LINE_SIZE (MAX_PATH + SCROLL_SPACING + 3*LCD_WIDTH + 2)
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#endif
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struct scrollinfo
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{
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struct viewport* vp;
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char line[SCROLL_LINE_SIZE];
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#ifdef HAVE_LCD_CHARCELLS
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int len; /* length of line in chars */
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#endif
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int y; /* Position of the line on the screen (char co-ordinates) */
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int offset;
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int startx;
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int y_offset; /* y offset of the line, used for pixel-accurate list scrolling */
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#ifdef HAVE_LCD_BITMAP
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int width; /* length of line in pixels */
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int style; /* line style */
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#endif/* HAVE_LCD_BITMAP */
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bool backward; /* scroll presently forward or backward? */
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bool bidir;
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long start_tick;
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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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#ifdef HAVE_LCD_CHARCELLS
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long jump_scroll_delay; /* delay between jump scroll jumps */
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int jump_scroll; /* 0=off, 1=once, ..., JUMP_SCROLL_ALWAYS */
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#endif
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#if defined(HAVE_LCD_BITMAP) || defined(HAVE_REMOTE_LCD)
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int step; /* pixels per scroll step */
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#endif
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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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#ifdef HAVE_LCD_BITMAP
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#define LCD_SCROLLABLE_LINES ((LCD_HEIGHT+4)/5 < 32 ? (LCD_HEIGHT+4)/5 : 32)
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#else
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#define LCD_SCROLLABLE_LINES LCD_HEIGHT * 2
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#endif
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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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