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/*
* This file is part of MPlayer.
*
* MPlayer 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.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdlib.h>
#include <assert.h>
#include <stdbool.h>
#include "osdep/timer.h"
#include "input/input.h"
#include "input/keycodes.h"
#include "mp_fifo.h"
#include "talloc.h"
#include "options.h"
struct mp_fifo {
struct MPOpts *opts;
int *data;
int readpos;
int size;
int num_entries;
int max_up;
int num_up;
int last_key_down;
unsigned last_down_time;
};
struct mp_fifo *mp_fifo_create(struct MPOpts *opts)
{
struct mp_fifo *fifo = talloc_zero(NULL, struct mp_fifo);
fifo->opts = opts;
/* Typical mouse wheel use will generate a sequence repeating 3 events:
* down, doubleclick, up, down, doubleclick, up, ...
* Normally only one of those event types triggers a command,
* so allow opts->key_fifo_size such repeats.
*/
fifo->max_up = opts->key_fifo_size;
fifo->size = opts->key_fifo_size * 3;
fifo->data = talloc_array_ptrtype(fifo, fifo->data, fifo->size);
return fifo;
}
static bool is_up(int code)
{
return code > 0 && !(code & MP_KEY_DOWN)
&& !(code >= MOUSE_BTN0_DBL && code < MOUSE_BTN_DBL_END);
}
static int fifo_peek(struct mp_fifo *fifo, int offset)
{
return fifo->data[(fifo->readpos + offset) % fifo->size];
}
static int fifo_read(struct mp_fifo *fifo)
{
int code = fifo_peek(fifo, 0);
fifo->readpos += 1;
fifo->readpos %= fifo->size;
fifo->num_entries--;
fifo->num_up -= is_up(code);
assert(fifo->num_entries >= 0);
assert(fifo->num_up >= 0);
return code;
}
static void fifo_write(struct mp_fifo *fifo, int code)
{
fifo->data[(fifo->readpos + fifo->num_entries) % fifo->size] = code;
fifo->num_entries++;
fifo->num_up += is_up(code);
assert(fifo->num_entries <= fifo->size);
assert(fifo->num_up <= fifo->max_up);
}
static void mplayer_put_key_internal(struct mp_fifo *fifo, int code)
{
// Clear key-down state if we're forced to drop entries
if (fifo->num_entries >= fifo->size - 1
|| fifo->num_up >= fifo->max_up) {
if (fifo_peek(fifo, fifo->num_entries - 1) != MP_INPUT_RELEASE_ALL)
fifo_write(fifo, MP_INPUT_RELEASE_ALL);
} else
fifo_write(fifo, code);
}
int mplayer_get_key(void *ctx, int fd)
{
struct mp_fifo *fifo = ctx;
if (!fifo->num_entries)
return MP_INPUT_NOTHING;
return fifo_read(fifo);
}
static void put_double(struct mp_fifo *fifo, int code)
{
if (code >= MOUSE_BTN0 && code < MOUSE_BTN_END)
mplayer_put_key_internal(fifo, code - MOUSE_BTN0 + MOUSE_BTN0_DBL);
}
void mplayer_put_key(struct mp_fifo *fifo, int code)
{
unsigned now = GetTimerMS();
int doubleclick_time = fifo->opts->doubleclick_time;
// ignore system-doubleclick if we generate these events ourselves
if (doubleclick_time
&& (code & ~MP_KEY_DOWN) >= MOUSE_BTN0_DBL
&& (code & ~MP_KEY_DOWN) < MOUSE_BTN_DBL_END)
return;
mplayer_put_key_internal(fifo, code);
if (code & MP_KEY_DOWN) {
code &= ~MP_KEY_DOWN;
if (fifo->last_key_down == code
&& now - fifo->last_down_time < doubleclick_time)
put_double(fifo, code);
fifo->last_key_down = code;
fifo->last_down_time = now;
}
}
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