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#ifndef __TS_FILTER_H__
#define __TS_FILTER_H__
/*
* touchscreen filter
*
* median
*
* (c) 2008 Andy Green <andy@openmoko.com>
*/
/* max filters you can chain up */
#define MAX_TS_FILTER_CHAIN 4
#define MAX_TS_FILTER_COORDS 6
struct ts_filter;
/* operations that a filter can perform
*/
struct ts_filter_api {
struct ts_filter * (*create)(void *config, int count_coords);
void (*destroy)(struct ts_filter *filter);
void (*clear)(struct ts_filter *filter);
int (*process)(struct ts_filter *filter, int *coords);
void (*scale)(struct ts_filter *filter, int *coords);
};
/* this is the common part of all filters, the result
* we use this type as an otherwise opaque handle on to
* the actual filter. Therefore you need one of these
* at the start of your actual filter struct
*/
struct ts_filter {
struct ts_filter *next; /* next in chain */
struct ts_filter_api *api; /* operations to use for this object */
int count_coords;
int coords[MAX_TS_FILTER_COORDS];
};
/*
* helper to create a filter chain from array of API pointers and
* array of config ints... leaves pointers to created filters in list
* array and fills in ->next pointers to create the chain
*/
extern int ts_filter_create_chain(struct ts_filter_api **api, void **config,
struct ts_filter **list, int count_coords);
/* helper to destroy a whole chain from the list of filter pointers */
extern void ts_filter_destroy_chain(struct ts_filter **list);
#endif
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