int
main(int argc, char** argv)
{
bool isGrayscale = CGDisplayUsesForceToGray();
// printf("isGrayscale = %d\n", isGrayscale);
CGDisplayForceToGray(!isGrayscale);
// printf("Grayscale is now: %d\n", CGDisplayUsesForceToGray());
return 0;
}
int main (int argc, const char * argv[]) {
CGError err;
CGGammaValue redMin, redMax, redGamma,
greenMin, greenMax, greenGamma,
blueMin, blueMax, blueGamma;
printf("setting up connection on UDP port 4740\n");
printf("server accepts 3 values of 0 to 127 that\n");
printf("are applied to the screen.\n");
// Current Gamma settings:
err = CGGetDisplayTransferByFormula (0,
&redMin, &redMax, &redGamma,
&greenMin, &greenMax, &greenGamma,
&blueMin, &blueMax, &blueGamma);
(void) signal(SIGINT, sigcatch);
// Setup network:
int port = 4740;
sock = socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP );
if ( sock <= 0 ) {
printf( "failed to create socket\n" );
return false;
}
sockaddr_in address;
memset(&address, 0, sizeof(address));
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons( (unsigned short) port );
if ( bind( sock, (const struct sockaddr *)&address, sizeof(sockaddr_in) ) < 0 ) {
printf( "failed to bind socket\n" );
return false;
}
// just for the hell of it
CGDisplayForceToGray(true);
while ( true ) // wait for packet
{
sockaddr_in from;
socklen_t fromLength = sizeof( from );
gammaFractions gammaPacket;
// process received packet
int rxbytes=recvfrom(sock,(char*)&gammaPacket, sizeof(gammaPacket),0,(const struct sockaddr*)&from,&fromLength);
if ( rxbytes <= 0 )
continue;
//unsigned int from_address = ntohl( from.sin_addr.s_addr );
//unsigned int from_port = ntohs( from.sin_port );
printf("recieved packet, bytes: %d\n", rxbytes);
printf("red: %x, green: %x, blue: %x\n", gammaPacket.red, gammaPacket.green, gammaPacket.blue);
err = CGSetDisplayTransferByFormula (0,
redMin, ((1.0/127)*gammaPacket.red )*redMax, redGamma,
greenMin, ((1.0/127)*gammaPacket.green)*greenMax, greenGamma,
blueMin, ((1.0/127)*gammaPacket.blue )*blueMax, blueGamma);
}
return 0;
}
void sigcatch(int sig) {
printf("You have pressed Ctrl-C , please press again to exit");
if (sock != -1) close(sock);
CGDisplayForceToGray(false);
(void) signal(SIGINT, SIG_DFL);
}
