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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Maurus Cuelenaere
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "button.h"
#include "button-target.h"
#include "touchscreen.h"
#include "string.h"
#include "logf.h"
#include "lcd.h"
/* Size of the 'dead zone' around each 3x3 button */
#define BUTTON_MARGIN_X (int)(LCD_WIDTH * 0.03)
#define BUTTON_MARGIN_Y (int)(LCD_HEIGHT * 0.03)
static bool touch_enabled = true;
static enum touchscreen_mode current_mode = TOUCHSCREEN_POINT;
static const int touchscreen_buttons[3][3] =
{
{BUTTON_TOPLEFT, BUTTON_TOPMIDDLE, BUTTON_TOPRIGHT},
{BUTTON_MIDLEFT, BUTTON_CENTER, BUTTON_MIDRIGHT},
{BUTTON_BOTTOMLEFT, BUTTON_BOTTOMMIDDLE, BUTTON_BOTTOMRIGHT}
};
#ifndef DEFAULT_TOUCHSCREEN_CALIBRATION
#define DEFAULT_TOUCHSCREEN_CALIBRATION { .A=1, .B=0, .C=0, \
.D=0, .E=1, .F=0, \
.divider=1 }
#endif
struct touchscreen_parameter calibration_parameters
= DEFAULT_TOUCHSCREEN_CALIBRATION;
const struct touchscreen_parameter default_calibration_parameters
= DEFAULT_TOUCHSCREEN_CALIBRATION;
void touchscreen_disable_mapping(void)
{
#define C(x) calibration_parameters.x
C(A) = C(E) = 1;
C(B) = C(C) = C(D) = C(F) = 0;
C(divider) = 1;
#undef C
}
void touchscreen_reset_mapping(void)
{
memcpy(&calibration_parameters, &default_calibration_parameters,
sizeof(struct touchscreen_parameter));
}
int touchscreen_calibrate(struct touchscreen_calibration *cal)
{
#define C(x) calibration_parameters.x /* Calibration */
#define S(i,j) cal->i[j][0] /* Screen */
#define D(i,j) cal->i[j][1] /* Display */
long divider = (S(x,0) - S(x,2)) * (S(y,1) - S(y,2)) -
(S(x,1) - S(x,2)) * (S(y,0) - S(y,2));
if(divider == 0)
return -1;
else
C(divider) = divider;
C(A) = (D(x,0) - D(x,2)) * (S(y,1) - S(y,2)) -
(D(x,1) - D(x,2)) * (S(y,0) - S(y,2));
C(B) = (S(x,0) - S(x,2)) * (D(x,1) - D(x,2)) -
(D(x,0) - D(x,2)) * (S(x,1) - S(x,2));
C(C) = S(y,0) * (S(x,2) * D(x,1) - S(x,1) * D(x,2)) +
S(y,1) * (S(x,0) * D(x,2) - S(x,2) * D(x,0)) +
S(y,2) * (S(x,1) * D(x,0) - S(x,0) * D(x,1));
C(D) = (D(y,0) - D(y,2)) * (S(y,1) - S(y,2)) -
(D(y,1) - D(y,2)) * (S(y,0) - S(y,2));
C(E) = (S(x,0) - S(x,2)) * (D(y,1) - D(y,2)) -
(D(y,0) - D(y,2)) * (S(x,1) - S(x,2));
C(F) = S(y,0) * (S(x,2) * D(y,1) - S(x,1) * D(y,2)) +
S(y,1) * (S(x,0) * D(y,2) - S(x,2) * D(y,0)) +
S(y,2) * (S(x,1) * D(y,0) - S(x,0) * D(y,1));
logf("A: %lX B: %lX C: %lX", C(A), C(B), C(C));
logf("D: %lX E: %lX F: %lX", C(D), C(E), C(F));
logf("divider: %lX", C(divider));
return 0;
#undef C
#undef S
#undef D
}
static void map_pixels(int *x, int *y)
{
#define C(x) calibration_parameters.x
int _x = *x, _y = *y;
*x = (C(A) * _x + C(B) * _y + C(C)) / C(divider);
*y = (C(D) * _x + C(E) * _y + C(F)) / C(divider);
#undef C
}
/* TODO: add jitter (and others) filter */
int touchscreen_to_pixels(int x, int y, int *data)
{
if(!touch_enabled)
return 0;
x &= 0xFFFF;
y &= 0xFFFF;
map_pixels(&x, &y);
if (current_mode == TOUCHSCREEN_BUTTON)
{
int column = 0, row = 0;
if (x < LCD_WIDTH/3 - BUTTON_MARGIN_X)
column = 0;
else if (x > LCD_WIDTH/3 + BUTTON_MARGIN_X &&
x < 2*LCD_WIDTH/3 - BUTTON_MARGIN_X)
column = 1;
else if (x > 2*LCD_WIDTH/3 + BUTTON_MARGIN_X)
column = 2;
else
return BUTTON_NONE;
if (y < LCD_HEIGHT/3 - BUTTON_MARGIN_Y)
row = 0;
else if (y > LCD_HEIGHT/3 + BUTTON_MARGIN_Y &&
y < 2*LCD_HEIGHT/3 - BUTTON_MARGIN_Y)
row = 1;
else if (y > 2*LCD_HEIGHT/3 + BUTTON_MARGIN_Y)
row = 2;
else
return BUTTON_NONE;
return touchscreen_buttons[row][column];
}
else
{
*data = (x << 16 | y);
return BUTTON_TOUCHSCREEN;
}
}
void touchscreen_set_mode(enum touchscreen_mode mode)
{
current_mode = mode;
}
enum touchscreen_mode touchscreen_get_mode(void)
{
return current_mode;
}
#ifndef HAS_BUTTON_HOLD
void touchscreen_enable(bool en)
{
if(en != touch_enabled)
{
touch_enabled = en;
touchscreen_enable_device(en);
}
}
bool touchscreen_is_enabled(void)
{
return touch_enabled;
}
#endif
#if ((CONFIG_PLATFORM & PLATFORM_ANDROID) == 0)
/* android has an API for this */
#define TOUCH_SLOP 16u
#define REFERENCE_DPI 160
int touchscreen_get_scroll_threshold(void)
{
#ifdef LCD_DPI
const int dpi = LCD_DPI;
#else
const int dpi = lcd_get_dpi();
#endif
/* Inspired by Android calculation
*
* float density = real dpi / reference dpi (=160)
* int threshold = (int) (density * TOUCH_SLOP + 0.5f);(original calculation)
*
* + 0.5f is for rounding, we use fixed point math to achieve that
*/
int result = dpi * (TOUCH_SLOP<<1) / REFERENCE_DPI;
result += result & 1; /* round up if needed */
return result>>1;
}
#endif
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