mp_fifo.c

   1 #include <stdlib.h>
   2 #include "osdep/timer.h"
   3 #include "input/input.h"
   4 #include "input/mouse.h"
   5 #include "mp_fifo.h"
   6 #include "talloc.h"
   7 #include "options.h"
   8
   9
  10 struct mp_fifo {
  11     struct MPOpts *opts;
  12     int *data;
  13     int readpos;
  14     int writepos;
  15     int size;
  16     unsigned last_key_time[2];
  17     int last_key[2];
  18 };
  19
  20 struct mp_fifo *mp_fifo_create(struct MPOpts *opts)
  21 {
  22     struct mp_fifo *fifo = talloc_zero(NULL, struct mp_fifo);
  23     fifo->opts = opts;
  24     fifo->size = opts->key_fifo_size;
  25     fifo->data = talloc_array_ptrtype(fifo, fifo->data, fifo->size);
  26     return fifo;
  27 }
  28
  29 static void mplayer_put_key_internal(struct mp_fifo *fifo, int code)
  30 {
  31     int fifo_free = fifo->readpos - fifo->writepos - 1;
  32     if (fifo_free < 0)
  33         fifo_free += fifo->size;
  34     if (!fifo_free)
  35         return; // FIFO FULL!!
  36     // reserve some space for key release events to avoid stuck keys
  37     if((code & MP_KEY_DOWN) && fifo_free < (fifo->size >> 1))
  38         return;
  39     fifo->data[fifo->writepos++] = code;
  40     fifo->writepos %= fifo->size;
  41 }
  42
  43 int mplayer_get_key(void *ctx, int fd)
  44 {
  45     struct mp_fifo *fifo = ctx;
  46     if (fifo->writepos == fifo->readpos)
  47         return MP_INPUT_NOTHING;
  48     int key = fifo->data[fifo->readpos++];
  49     fifo->readpos %= fifo->size;
  50     return key;
  51 }
  52
  53 static void put_double(struct mp_fifo *fifo, int code)
  54 {
  55   if (code >= MOUSE_BTN0 && code <= MOUSE_BTN9)
  56       mplayer_put_key_internal(fifo, code - MOUSE_BTN0 + MOUSE_BTN0_DBL);
  57 }
  58
  59 void mplayer_put_key(struct mp_fifo *fifo, int code)
  60 {
  61     unsigned now = GetTimerMS();
  62     int doubleclick_time = fifo->opts->doubleclick_time;
  63     // ignore system-doubleclick if we generate these events ourselves
  64     if (doubleclick_time
  65         && (code & ~MP_KEY_DOWN) >= MOUSE_BTN0_DBL
  66         && (code & ~MP_KEY_DOWN) <= MOUSE_BTN9_DBL)
  67         return;
  68     mplayer_put_key_internal(fifo, code);
  69     if (code & MP_KEY_DOWN) {
  70         code &= ~MP_KEY_DOWN;
  71         fifo->last_key[1] = fifo->last_key[0];
  72         fifo->last_key[0] = code;
  73         fifo->last_key_time[1] = fifo->last_key_time[0];
  74         fifo->last_key_time[0] = now;
  75         if (fifo->last_key[1] == code
  76             && now - fifo->last_key_time[1] < doubleclick_time)
  77             put_double(fifo, code);
  78         return;
  79     }
  80     if (fifo->last_key[0] == code && fifo->last_key[1] == code
  81         && now - fifo->last_key_time[1] < doubleclick_time)
  82         put_double(fifo, code);
  83 }