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fb-rotate.c
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fb-rotate.c
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// fb-rotate.c
//
// Compile with:
// gcc -w -o fb-rotate fb-rotate.c -framework IOKit -framework ApplicationServices
#include <getopt.h>
#include <IOKit/graphics/IOGraphicsLib.h>
#include <ApplicationServices/ApplicationServices.h>
#define PROGNAME "fb-rotate"
#define MAX_DISPLAYS 16
// kIOFBSetTransform comes from <IOKit/graphics/IOGraphicsTypesPrivate.h>
// in the source for the IOGraphics family
enum {
kIOFBSetTransform = 0x00000400,
};
void
usage(void)
{
fprintf(stderr, "usage: %s -l\n"
" %s -i\n"
" %s -d <display ID> -m\n"
" %s -d <display ID> -r <0|90|180|270|1>\n"
"\n"
"-r 1 signfies 90 if currently not rotated; otherwise 0 (i.e. toggle)\n"
"\n"
"-d -1 can be used for the <display ID> of the internal monitor\n"
"-d 0 can be used for the <display ID> of the main monitor\n"
"-d 1 can be used for the <display ID> of the first non-internal monitor\n",
PROGNAME, PROGNAME, PROGNAME, PROGNAME);
exit(1);
}
void
listDisplays(void)
{
CGDisplayErr dErr;
CGDisplayCount displayCount, i;
CGDirectDisplayID mainDisplay;
CGDisplayCount maxDisplays = MAX_DISPLAYS;
CGDirectDisplayID onlineDisplays[MAX_DISPLAYS];
mainDisplay = CGMainDisplayID();
dErr = CGGetOnlineDisplayList(maxDisplays, onlineDisplays, &displayCount);
if (dErr != kCGErrorSuccess) {
fprintf(stderr, "CGGetOnlineDisplayList: error %d.\n", dErr);
exit(1);
}
printf("Display ID Resolution\n");
for (i = 0; i < displayCount; i++) {
CGDirectDisplayID dID = onlineDisplays[i];
printf("0x%-14x %lux%lu %32s", dID,
CGDisplayPixelsWide(dID), CGDisplayPixelsHigh(dID),
(dID == mainDisplay) ? "[main display]\n" : "\n");
}
exit(0);
}
void
infoDisplays(void)
{
CGDisplayErr dErr;
CGDisplayCount displayCount, i;
CGDirectDisplayID mainDisplay;
CGDisplayCount maxDisplays = MAX_DISPLAYS;
CGDirectDisplayID onlineDisplays[MAX_DISPLAYS];
CGEventRef ourEvent = CGEventCreate(NULL);
CGPoint ourLoc = CGEventGetLocation(ourEvent);
CFRelease(ourEvent);
mainDisplay = CGMainDisplayID();
dErr = CGGetOnlineDisplayList(maxDisplays, onlineDisplays, &displayCount);
if (dErr != kCGErrorSuccess) {
fprintf(stderr, "CGGetOnlineDisplayList: error %d.\n", dErr);
exit(1);
}
printf("# Display_ID Resolution ____Display_Bounds____ Rotation\n");
for (i = 0; i < displayCount; i++) {
CGDirectDisplayID dID = onlineDisplays[i];
printf("%-2d 0x%-10x %4lux%-4lu %5.0f %5.0f %5.0f %5.0f %3.0f %s%s%s",
CGDisplayUnitNumber (dID), dID,
CGDisplayPixelsWide(dID), CGDisplayPixelsHigh(dID),
CGRectGetMinX (CGDisplayBounds (dID)),
CGRectGetMinY (CGDisplayBounds (dID)),
CGRectGetMaxX (CGDisplayBounds (dID)),
CGRectGetMaxY (CGDisplayBounds (dID)),
CGDisplayRotation (dID),
(CGDisplayIsActive (dID)) ? "" : "[inactive]",
(dID == mainDisplay) ? "[main]" : "",
(CGDisplayIsBuiltin (dID)) ? "[internal]\n" : "\n");
}
printf("Mouse Cursor Position: ( %5.0f , %5.0f )\n",
(float)ourLoc.x, (float)ourLoc.y);
exit(0);
}
void
setMainDisplay(CGDirectDisplayID targetDisplay)
{
int deltaX, deltaY, flag;
CGDisplayErr dErr;
CGDisplayCount displayCount, i;
CGDirectDisplayID mainDisplay;
CGDisplayCount maxDisplays = MAX_DISPLAYS;
CGDirectDisplayID onlineDisplays[MAX_DISPLAYS];
CGDisplayConfigRef config;
mainDisplay = CGMainDisplayID();
if (mainDisplay == targetDisplay) {
exit(0);
}
dErr = CGGetOnlineDisplayList(maxDisplays, onlineDisplays, &displayCount);
if (dErr != kCGErrorSuccess) {
fprintf(stderr, "CGGetOnlineDisplayList: error %d.\n", dErr);
exit(1);
}
flag = 0;
for (i = 0; i < displayCount; i++) {
CGDirectDisplayID dID = onlineDisplays[i];
if (dID == targetDisplay) { flag = 1; }
}
if (flag == 0) {
fprintf(stderr, "No such display ID: 0x%-10x.\n", targetDisplay);
exit(1);
}
deltaX = -CGRectGetMinX (CGDisplayBounds (targetDisplay));
deltaY = -CGRectGetMinY (CGDisplayBounds (targetDisplay));
CGBeginDisplayConfiguration (&config);
for (i = 0; i < displayCount; i++) {
CGDirectDisplayID dID = onlineDisplays[i];
CGConfigureDisplayOrigin (config, dID,
CGRectGetMinX (CGDisplayBounds (dID)) + deltaX,
CGRectGetMinY (CGDisplayBounds (dID)) + deltaY );
}
CGCompleteDisplayConfiguration (config, kCGConfigureForSession);
exit(0);
}
CGDirectDisplayID
InternalID(void) {
// returns the ID of the internal monitor;
CGDisplayErr dErr;
CGDisplayCount displayCount, i;
CGDisplayCount maxDisplays = MAX_DISPLAYS;
CGDirectDisplayID onlineDisplays[MAX_DISPLAYS];
CGDirectDisplayID fallbackID = 0;
dErr = CGGetOnlineDisplayList(maxDisplays, onlineDisplays, &displayCount);
if (dErr != kCGErrorSuccess) {
fprintf(stderr, "CGGetOnlineDisplayList: error %d.\n", dErr);
exit(1);
}
for (i = 0; i < displayCount; i++) {
CGDirectDisplayID dID = onlineDisplays[i];
if ((CGDisplayIsBuiltin (dID))) {
return dID;
}
}
return fallbackID;
}
CGDirectDisplayID
nonInternalID(void) {
// returns the ID of the first active monitor that is not internal or 0 if only one monitor;
CGDisplayErr dErr;
CGDisplayCount displayCount, i;
CGDisplayCount maxDisplays = MAX_DISPLAYS;
CGDirectDisplayID onlineDisplays[MAX_DISPLAYS];
CGDirectDisplayID fallbackID = 0;
dErr = CGGetOnlineDisplayList(maxDisplays, onlineDisplays, &displayCount);
if (dErr != kCGErrorSuccess) {
fprintf(stderr, "CGGetOnlineDisplayList: error %d.\n", dErr);
exit(1);
}
for (i = 0; i < displayCount; i++) {
CGDirectDisplayID dID = onlineDisplays[i];
if (!(CGDisplayIsBuiltin (dID)) && (CGDisplayIsActive (dID))) {
return dID;
}
}
return fallbackID;
}
CGDirectDisplayID
cgIDfromU32(uint32_t preId)
{
CGDisplayErr dErr;
CGDisplayCount displayCount, i;
CGDisplayCount maxDisplays = MAX_DISPLAYS;
CGDirectDisplayID onlineDisplays[MAX_DISPLAYS];
CGDirectDisplayID postId = preId;
dErr = CGGetOnlineDisplayList(maxDisplays, onlineDisplays, &displayCount);
if (dErr != kCGErrorSuccess) {
fprintf(stderr, "CGGetOnlineDisplayList: error %d.\n", dErr);
exit(1);
}
for (i = 0; i < displayCount; i++) {
CGDirectDisplayID dID = onlineDisplays[i];
if ((dID == preId) || (dID == postId) ||
(onlineDisplays[i] == preId) || (onlineDisplays[i] == postId)) {
return dID;
}
}
fprintf(stderr, " Could not find a matching id in onlineDisplays!\n");
exit(1);
}
IOOptionBits
angle2options(long angle)
{
static IOOptionBits anglebits[] = {
(kIOFBSetTransform | (kIOScaleRotate0) << 16),
(kIOFBSetTransform | (kIOScaleRotate90) << 16),
(kIOFBSetTransform | (kIOScaleRotate180) << 16),
(kIOFBSetTransform | (kIOScaleRotate270) << 16)
};
if ((angle % 90) != 0) // Map arbitrary angles to a rotation reset
return anglebits[0];
return anglebits[(angle / 90) % 4];
}
int
main(int argc, char **argv)
{
int i;
long angle = 0;
long currentRotation = 0;
io_service_t service;
CGDisplayErr dErr;
CGDirectDisplayID targetDisplay = 0;
IOOptionBits options;
while ((i = getopt(argc, argv, "d:limr:")) != -1) {
switch (i) {
case 'd':
targetDisplay = (CGDirectDisplayID)strtoul(optarg, NULL, 16);
if (targetDisplay == -1)
targetDisplay = InternalID();
if (targetDisplay == 0)
targetDisplay = CGMainDisplayID();
if (targetDisplay == 1) {
targetDisplay = nonInternalID();
if (targetDisplay == 0) {
fprintf(stderr, "Could not find an active monitor besides the internal one.\n");
exit(1);
}
}
break;
case 'l':
listDisplays();
break;
case 'i':
infoDisplays();
break;
case 'm':
setMainDisplay(targetDisplay);
break;
case 'r':
angle = strtol(optarg, NULL, 10);
break;
default:
break;
}
}
if (targetDisplay == 0)
usage();
if (angle == 1) {
currentRotation = CGDisplayRotation (targetDisplay);
if (currentRotation == 0) {
angle = 90;
} else {
angle = 0;
}
}
options = angle2options(angle);
// Get the I/O Kit service port of the target display
// Since the port is owned by the graphics system, we should not destroy it
// in Yosemite it seems important to have a call to CGGetOnlineDisplayList() before calling
// CGDisplayIOServicePort() or the later replacements CGDisplayVendorNumber() etc.
// otherwise this program can hang.
CGDirectDisplayID td2 = cgIDfromU32(targetDisplay);
service = CGDisplayIOServicePort(td2);
// We will get an error if the target display doesn't support the
// kIOFBSetTransform option for IOServiceRequestProbe()
dErr = IOServiceRequestProbe(service, options);
if (dErr != kCGErrorSuccess) {
fprintf(stderr, "IOServiceRequestProbe: error %d\n", dErr);
exit(1);
}
exit(0);
}