/**
* This idle function allows progressive scanning of visibility etc
*/
bool
GlueMapWindow::Idle()
{
if (!render_projection.IsValid())
return false;
if (idle_robin == unsigned(-1)) {
/* draw the first frame as quickly as possible, so the user can
start interacting with XCSoar immediately */
idle_robin = 2;
return true;
}
if (!IsUserIdle(2500))
/* don't hold back the UI thread while the user is interacting */
return true;
PeriodClock clock;
clock.Update();
bool still_dirty;
bool topography_dirty = true; /* scan topography in every Idle() call */
bool terrain_dirty = true;
bool weather_dirty = true;
do {
idle_robin = (idle_robin + 1) % 3;
switch (idle_robin) {
case 0:
topography_dirty = UpdateTopography(1) > 0;
break;
case 1:
terrain_dirty = UpdateTerrain();
break;
case 2:
weather_dirty = UpdateWeather();
break;
}
still_dirty = terrain_dirty || topography_dirty || weather_dirty;
} while (!clock.Check(700) && /* stop after 700ms */
#ifndef ENABLE_OPENGL
!draw_thread->IsTriggered() &&
#endif
IsUserIdle(2500) &&
still_dirty);
return still_dirty;
}
bool
FlarmDevice::Receive(const char *prefix, char *buffer, size_t length,
unsigned timeout_ms)
{
assert(!in_binary_mode);
assert(prefix != NULL);
PeriodClock timeout;
timeout.Update();
if (!port.ExpectString(prefix, timeout_ms))
return false;
char *p = (char *)buffer, *end = p + length;
while (p < end) {
if (timeout.Check(timeout_ms))
return false;
// Read single character from port
int c = port.GetChar();
// On failure try again until timed out
if (c == -1)
continue;
// Break on line break or checksum
if (c == '*' || c == '\n') {
*p = '\0';
break;
}
// Skip carriage return
if (c == '\r')
continue;
// Write received character to buffer
*p = c;
p++;
}
return true;
}
/**
* This idle function allows progressive scanning of visibility etc
*/
bool
GlueMapWindow::Idle()
{
if (!render_projection.IsValid())
return false;
if (skip_idle) {
/* draw the first frame as quickly as possible, so the user can
start interacting with XCSoar immediately */
skip_idle = false;
return true;
}
/* hack: update RASP weather maps as quickly as possible; they only
ever need to be updated after the user has selected a new map, so
this is not a UI latency problem (quite contrary, don't let the
user wait until he sees the new map) */
UpdateWeather();
if (!IsUserIdle(2500))
/* don't hold back the UI thread while the user is interacting */
return true;
PeriodClock clock;
clock.Update();
bool still_dirty;
do {
still_dirty = UpdateWeather() || UpdateTerrain();
} while (!clock.Check(700) && /* stop after 700ms */
#ifndef ENABLE_OPENGL
!draw_thread->IsTriggered() &&
#endif
IsUserIdle(2500) &&
still_dirty);
return still_dirty;
}
static bool
TryConnect(Port &port, char *user_data, size_t max_user_data,
OperationEnvironment &env)
{
port.Write('\x02'); // send IO Mode command
unsigned user_size = 0;
bool started = false;
PeriodClock clock;
clock.Update();
int i;
while ((i = port.GetChar()) != EOF && !clock.Check(8000) &&
!env.IsCancelled()) {
char ch = (char)i;
if (!started && ch == '-')
started = true;
if (started) {
if (ch == 0x13) {
port.Write('\x16');
user_data[user_size] = 0;
// found end of file
return true;
} else {
if (user_size < max_user_data - 1) {
user_data[user_size] = ch;
user_size++;
}
}
}
}
return false;
}
bool
IsUserIdle(unsigned duration_ms)
{
return user_idle_clock.Check(duration_ms);
}