platform.h

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/*
OmniGlass: touchpad gesture detection engine.
Copyright (C) 2023 Felipe Choi
 
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 program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
 
#include <stdbool.h>
 
#include <lua.h>
 
#include "omniglass.h"
 
 
struct platform;
 
omniglass_init_result platform_init(struct platform **platform, lua_State *vm);
 
typedef struct touch_point{
    int x;
    int y;
    bool touched;
} touch_point;
 
typedef enum touchParameter {
    PRESSURE, 
    AREA,   
    DISTANCE_TO_SURFACE 
} touch_parameter;
 
//extended parameters (many touchpad drivers may not support any of these.)
typedef unsigned int touch_pressure;    //pressure applied on a contact point.
typedef unsigned int touch_area;        //combined area of all the intersection belonging to an identified contact region centered around a point.
typedef unsigned int touch_distance_to_surface;  //distance in millimeters;
 
typedef struct extended_touch_parameter{
    touch_parameter type;   
    void *data;             
} extended_touch_parameter;
 
typedef struct multitouch_report{
    touch_point *touches;
    extended_touch_parameter **extended_touch_parameters;
} multitouch_report;
 
int multitouch_next_report(struct multitouch_report *report);
 
typedef struct touchpad_params{
    int min_x;
    int max_x;
    int min_y;
    int max_y;
    int touch_count;
    int extended_touch_parameter_count;
} touchpad_params;
 
void get_touchpad_parameters(struct omniglass *handle, struct touchpad_params *destination);
 
int platform_parse_events(lua_State *vm);
 
int platform_get_last_report(lua_State *vm);