/**
* Updates the sensor by reading the current value into it
*/
static void update(CAMERA_STATE *camera, struct sensor *sensor) {
if (!sensor->enabled)
return;
struct state *state = (struct state *) sensor;
if (!state->loader)
state->loader = exif_loader_new();
exif_loader_reset(state->loader);
exif_loader_write(state->loader, camera->imagedata.buffer, camera->imagedata.pos);
ExifData *data = exif_loader_get_data(state->loader);
ExifByteOrder bo = exif_data_get_byte_order(data);
int valid = get_shutter_speed(data, bo, &state->shutter_speed);
if (valid)
valid = get_aperture(data, bo, &state->aperture);
if (valid)
valid = getDouble(data, bo, EXIF_TAG_ISO_SPEED_RATINGS, &state->iso);
exif_data_free(data);
if (valid) {
// Calculate the light level
state->light_level = (2.0 * log(state->aperture) - log(state->shutter_speed) - log(state->iso / 100.0)) / log(2.0);
// Update the sensor
sensor_log(camera, &state->sensor, (int) (state->light_level * 1000), "Lvl %.1f", state->light_level);
}
}
void GERBER_PLOTTER::select_aperture( const wxSize& size,
APERTURE::Aperture_Type type )
{
wxASSERT( output_file );
if( ( current_aperture == apertures.end() )
|| ( current_aperture->type != type )
|| ( current_aperture->size != size ) )
{
/* Pick an existing aperture or create a new one */
current_aperture = get_aperture( size, type );
fprintf( output_file, "G54D%d*\n", current_aperture->D_code );
}
}
