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/** \file server/drivers/lcd.h
* This file defines the LCDd-driver API
*
* It is written to facilitate loadable driver modules.
* There should be no further interaction between driver and server core
* other that via this API.
*
* Driver writer notes
* ~~~~~~~~~~~~~~~~~~~
* See documentation in the docs/lcdproc-dev/ directory.
*
* DO NOT MIX DRIVER ALLOCATED AND CORE ALLOCATED MEMORY.
* With this I mean that the server core should NEVER WRITE in memory
* allocated by the driver, and vice versa. Also the driver resp. core
* should free or realloc the memory that it has allocated. You can always
* simply copy a string if its data space is not 'yours'.
*/
/*-
* This file is part of LCDd, the lcdproc server.
*
* This file is released under the GNU General Public License. Refer to the
* COPYING file distributed with this package.
*
* Copyright (c) 1999, William Ferrell, Selene Scriven
* 2001, Joris Robijn
*/
#ifndef LCD_H
#define LCD_H
#include <stddef.h>
/* Maximum supported sizes */
#define LCD_MAX_WIDTH 256
#define LCD_MAX_HEIGHT 256
/* Standard supported sizes */
#define LCD_DEFAULT_WIDTH 20
#define LCD_DEFAULT_HEIGHT 4
#define LCD_DEFAULT_CELLWIDTH 5
#define LCD_DEFAULT_CELLHEIGHT 8
/* Backlight data */
#define BACKLIGHT_OFF 0
#define BACKLIGHT_ON 1
/* Icons. If a driver does not support an icon, it can return -1 from the
* icon function, and let the core place a replacement character.
*/
/* Icons below are one character wide */
#define ICON_BLOCK_FILLED 0x100
#define ICON_HEART_OPEN 0x108
#define ICON_HEART_FILLED 0x109
#define ICON_ARROW_UP 0x110
#define ICON_ARROW_DOWN 0x111
#define ICON_ARROW_LEFT 0x112
#define ICON_ARROW_RIGHT 0x113
#define ICON_CHECKBOX_OFF 0x120
#define ICON_CHECKBOX_ON 0x121
#define ICON_CHECKBOX_GRAY 0x122
#define ICON_SELECTOR_AT_LEFT 0x128
#define ICON_SELECTOR_AT_RIGHT 0x129
#define ICON_ELLIPSIS 0x130
/* Icons below are two characters wide */
#define ICON_STOP 0x200 /* should look like [] */
#define ICON_PAUSE 0x201 /* should look like || */
#define ICON_PLAY 0x202 /* should look like > */
#define ICON_PLAYR 0x203 /* should llok like < */
#define ICON_FF 0x204 /* should look like >> */
#define ICON_FR 0x205 /* should look like << */
#define ICON_NEXT 0x206 /* should look like >| */
#define ICON_PREV 0x207 /* should look like |< */
#define ICON_REC 0x208 /* should look like () */
/* Icon numbers from 0 to 0x0FF could be used for client defined chars.
* However this is not implemented and there are no crystalized ideas
* about how to do it. get_free_chars and set_char should be used, but a
* lot of things in that area might need to be changed.
*/
/* Heartbeat data */
#define HEARTBEAT_OFF 0
#define HEARTBEAT_ON 1
/* Patterns for hbar / vbar, mostly (if not all) UNIMPLEMENTED */
#define BAR_POS 0x001 /* default
Promilles allowed: 0 to 1000
The zero-point is at the left or bottom */
#define BAR_NEG 0x002 /* the bar grows in negative direction
Promilles allowed: -1000 to 0
The zero-point is at the left or top */
#define BAR_POS_AND_NEG 0x003 /* the bars can grow in both directions
Promilles allowed: -1000 to 1000
The zero-point is in the center */
#define BAR_PATTERN_FILLED 0x000 /* default */
#define BAR_PATTERN_OPEN 0x010
#define BAR_PATTERN_STRIPED 0x020
#define BAR_WITH_PERCENTAGE 0x100
/* Cursor types */
#define CURSOR_OFF 0
#define CURSOR_DEFAULT_ON 1
#define CURSOR_BLOCK 4
#define CURSOR_UNDER 5
/* Type of characters currently stored in CGRAM. */
typedef enum {
standard, /* one char is used for heartbeat */
vbar, /* vertical bars */
hbar, /* horizontal bars */
icons, /* standard icons */
custom, /* custom settings */
bignum, /* big numbers */
} CGmode;
/* What does the shared module handle look like on the current platform? */
#define MODULE_HANDLE void*
/* And how do we define the exported functions */
#define MODULE_EXPORT
typedef struct lcd_logical_driver {
/* For explanation of variables and functions see docs/API-v0.5.txt */
/******** Variables in the driver module ********/
/* The driver loader will look for symbols with these names ! */
char **api_version;
int *stay_in_foreground; /* Does this driver require to be in foreground ? */
int *supports_multiple; /* Does this driver support multiple instances ? */
char **symbol_prefix; /* What should alternatively be prepended to the function names ? */
/******** Functions in the driver module ********/
/* The driver loader will look for symbols with these names ! */
/* mandatory functions (necessary for all drivers) */
int (*init) (struct lcd_logical_driver *drvthis);
void (*close) (struct lcd_logical_driver *drvthis);
/* essential output functions (necessary for output drivers) */
int (*width) (struct lcd_logical_driver *drvthis);
int (*height) (struct lcd_logical_driver *drvthis);
void (*clear) (struct lcd_logical_driver *drvthis);
void (*flush) (struct lcd_logical_driver *drvthis);
void (*string) (struct lcd_logical_driver *drvthis, int x, int y, const char *str);
void (*chr) (struct lcd_logical_driver *drvthis, int x, int y, char c);
/* essential input functions (necessary for all input drivers) */
const char *(*get_key) (struct lcd_logical_driver *drvthis);
/* extended output functions (optional; core provides alternatives) */
void (*vbar) (struct lcd_logical_driver *drvthis, int x, int y, int len, int promille, int pattern);
void (*hbar) (struct lcd_logical_driver *drvthis, int x, int y, int len, int promille, int pattern);
void (*num) (struct lcd_logical_driver *drvthis, int x, int num);
void (*heartbeat) (struct lcd_logical_driver *drvthis, int state);
int (*icon) (struct lcd_logical_driver *drvthis, int x, int y, int icon);
void (*cursor) (struct lcd_logical_driver *drvthis, int x, int y, int type);
/* user-defined character functions, are those still supported ? */
void (*set_char) (struct lcd_logical_driver *drvthis, int n, unsigned char *dat);
int (*get_free_chars) (struct lcd_logical_driver *drvthis);
int (*cellwidth) (struct lcd_logical_driver *drvthis);
int (*cellheight) (struct lcd_logical_driver *drvthis);
/* Hardware functions */
int (*get_contrast) (struct lcd_logical_driver *drvthis);
void (*set_contrast) (struct lcd_logical_driver *drvthis, int promille);
int (*get_brightness) (struct lcd_logical_driver *drvthis, int state);
void (*set_brightness) (struct lcd_logical_driver *drvthis, int state, int promille);
void (*backlight) (struct lcd_logical_driver *drvthis, int on);
void (*output) (struct lcd_logical_driver *drvthis, int state);
/* informational functions */
const char * (*get_info) (struct lcd_logical_driver *drvthis);
/******** Variables in server core available for drivers ********/
char *name; /* Name of this driver */
char *filename; /* Filename of the shared module */
MODULE_HANDLE module_handle; /* The handle of the loaded shared module
Is platform specific */
void *private_data; /* Filled by server by calling store_private_ptr()
Driver should cast this to it's own
private structure pointer */
/******** Functions in server core available for drivers ********/
int (*store_private_ptr) (struct lcd_logical_driver * driver, void * private_data);
/* Store the driver's private data */
/* Configfile functions */
/* See configfile.h for descriptions and usage. */
short (*config_get_bool) (const char *sectionname, const char *keyname, int skip, short default_value);
long int (*config_get_int) (const char *sectionname, const char *keyname, int skip, long int default_value);
double (*config_get_float) (const char *sectionname, const char *keyname, int skip, double default_value);
const char *( *config_get_string)(const char *sectionname, const char *keyname, int skip, const char *default_value);
int (*config_has_section) (const char *sectionname);
int (*config_has_key) (const char *sectionname, const char *keyname);
/* Reporting function */
/* Easily usable by including drivers/report.h */
void (*report) (const int level, const char *format, .../*args*/ );
/* Display properties functions (for drivers that adapt to other loaded drivers) */
int (*request_display_width) ();
int (*request_display_height) ();
} Driver;
#endif
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