Revision 91
binary shenanigans to reduce code
| state_machine.c | ||
|---|---|---|
| 7 | 7 |
#include "utils.h" |
| 8 | 8 |
|
| 9 | 9 |
struct mouse_ev* mouse_get_event(struct packet *pp) {
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| 10 |
|
|
| 11 | 10 |
static struct mouse_ev event; |
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static struct packet last; // compare consecutive events |
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static int aux = 1; // first iteration |
|
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static uint8_t last = 0; |
|
| 14 | 12 |
|
| 15 | 13 |
if (pp == NULL) |
| 16 | 14 |
return &event; |
| 17 | 15 |
|
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// current packet |
|
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uint8_t lb_press = pp->bytes[0] & LEFT_BUTTON; |
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uint8_t rb_press = pp->bytes[0] & RIGHT_BUTTON; |
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uint8_t mb_press = pp->bytes[0] & MIDDLE_BUTTON; |
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// current button presses |
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uint8_t button_presses = pp->bytes[0] & (LEFT_BUTTON | RIGHT_BUTTON | MIDDLE_BUTTON); |
|
| 22 | 18 |
int16_t delta_x = pp->delta_x; |
| 23 | 19 |
int16_t delta_y = pp->delta_y; |
| 24 | 20 |
|
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if (aux) { // first event detected
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|
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if (lb_press && (rb_press | mb_press) == 0 && delta_x == 0 && delta_y == 0) |
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event.type = LB_PRESSED; |
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else if (rb_press && (lb_press | mb_press) == 0 && delta_x == 0 && delta_y == 0) |
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event.type = RB_PRESSED; |
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else if ((delta_x || delta_y) && (lb_press | rb_press | mb_press) == 0) {
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event.type = MOUSE_MOV; |
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event.delta_x = delta_x; |
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event.delta_y = delta_y; |
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} else |
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event.type = BUTTON_EV; |
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aux = 0; |
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} else {
|
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// last packet |
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uint8_t last_lb_press = last.bytes[0] & LEFT_BUTTON; |
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uint8_t last_rb_press = last.bytes[0] & RIGHT_BUTTON; |
|
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uint8_t last_mb_press = last.bytes[0] & MIDDLE_BUTTON; |
|
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if ((button_presses ^ last) == LEFT_BUTTON && !(last & LEFT_BUTTON)) {
|
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event.type = LB_PRESSED; |
|
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last |= LEFT_BUTTON; |
|
| 42 | 24 |
|
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if (lb_press && (rb_press | mb_press) == 0 && delta_x == 0 && delta_y == 0 && last_lb_press == 0) |
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event.type = LB_PRESSED; |
|
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else if (rb_press && (lb_press | mb_press) == 0 && delta_x == 0 && delta_y == 0 && last_rb_press == 0) |
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event.type = RB_PRESSED; |
|
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else if ((lb_press | rb_press | mb_press) == 0 && delta_x == 0 && delta_y == 0 && last_lb_press) |
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event.type = LB_RELEASED; |
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else if ((lb_press | rb_press | mb_press) == 0 && delta_x == 0 && delta_y == 0 && last_rb_press) |
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event.type = RB_RELEASED; |
|
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else if ((delta_x || delta_y) && (lb_press | rb_press | mb_press) == (last_lb_press | last_rb_press | last_mb_press)) {
|
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event.type = MOUSE_MOV; |
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event.delta_x = delta_x; |
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event.delta_y = delta_y; |
|
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} else |
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event.type = BUTTON_EV; |
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} |
|
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} else if ((button_presses ^ last) == RIGHT_BUTTON && !(last & RIGHT_BUTTON)) {
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event.type = RB_PRESSED; |
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last |= RIGHT_BUTTON; |
|
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|
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// update last packet for comparison |
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last = *pp; |
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} else if ((button_presses ^ last) == LEFT_BUTTON && (last & LEFT_BUTTON)) {
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event.type = LB_RELEASED; |
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last &= ~LEFT_BUTTON; |
|
| 61 | 32 |
|
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} else if ((button_presses ^ last) == RIGHT_BUTTON && (last & RIGHT_BUTTON)) {
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event.type = RB_RELEASED; |
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last &= ~RIGHT_BUTTON; |
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|
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} else if ((delta_x || delta_y) && (button_presses == last)) {
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event.type = MOUSE_MOV; |
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|
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} else |
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event.type = BUTTON_EV; |
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|
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event.delta_x = delta_x; |
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event.delta_y = delta_y; |
|
| 62 | 45 |
return &event; |
| 63 | 46 |
} |
| 64 | 47 |
|
| ... | ... | |
| 89 | 72 |
x_length += event->delta_x; |
| 90 | 73 |
y_length += event->delta_y; |
| 91 | 74 |
} else if (event->type == LB_RELEASED) {
|
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if (x_length == 0 || y_length == 0) {
|
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if (y_length < x_length || x_length < x_len) {
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|
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state = INITIAL; |
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break; |
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} |
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|
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int slope = y_length / x_length; |
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|
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if (slope <= 1 || x_length < x_len) {
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state = INITIAL; |
|
| 101 | 77 |
x_length = 0; |
| 102 | 78 |
y_length = 0; |
| 103 | 79 |
break; |
| ... | ... | |
| 139 | 115 |
state = INITIAL; |
| 140 | 116 |
break; |
| 141 | 117 |
} |
| 142 |
int slope = y_length / x_length; |
|
| 143 | 118 |
|
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if (slope >= -1 || x_length < x_len) {
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if (y_length > -x_length || x_length < x_len) {
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|
| 145 | 120 |
state = INITIAL; |
| 146 | 121 |
x_length = 0; |
| 147 | 122 |
y_length = 0; |
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