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main.c
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main.c
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// vim: ts=4:sw=4
/*
* screenresolution sets the screen resolution on Mac computers.
* Copyright (C) 2011 John Ford <john@johnford.info>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include "version.h"
#include "cg_utils.h"
#include <sys/param.h>
// Number of modes to list per line.
#define MODES_PER_LINE 3
// I have written an alternate list routine that spits out WAY more info
// #define LIST_DEBUG 1
unsigned int listAvailableModes(CGDirectDisplayID display, int displayNum);
unsigned int listCurrentMode(CGDirectDisplayID display, int displayNum);
int main(int argc, const char *argv[]) {
// http://developer.apple.com/library/IOs/#documentation/CoreFoundation/Conceptual/CFStrings/Articles/MutableStrings.html
int i;
CFMutableStringRef args = CFStringCreateMutable(NULL, 0);
CFStringEncoding encoding = CFStringGetSystemEncoding();
CFStringAppend(args, CFSTR("starting screenresolution argv="));
for (i = 0 ; i < argc ; i++) {
CFStringAppendCString(args, argv[i], encoding);
// If I were so motivated, I'd probably use CFStringAppendFormat
CFStringAppend(args, CFSTR(" "));
}
// This has security implications. Will look at that later
NSLog(CFSTR("%@"), args);
unsigned int exitcode = 0;
if (argc > 1) {
int d;
int keepgoing = 1;
CGError rc;
uint32_t displayCount = 0;
uint32_t activeDisplayCount = 0;
CGDirectDisplayID *activeDisplays = NULL;
rc = CGGetActiveDisplayList(0, NULL, &activeDisplayCount);
if (rc != kCGErrorSuccess) {
NSLog(CFSTR("%s"), "Error: failed to get list of active displays");
return 1;
}
// Allocate storage for the next CGGetActiveDisplayList call
activeDisplays = (CGDirectDisplayID *) malloc(activeDisplayCount * sizeof(CGDirectDisplayID));
if (activeDisplays == NULL) {
NSLog(CFSTR("%s"), "Error: could not allocate memory for display list");
return 1;
}
rc = CGGetActiveDisplayList(activeDisplayCount, activeDisplays, &displayCount);
if (rc != kCGErrorSuccess) {
NSLog(CFSTR("%s"), "Error: failed to get list of active displays");
return 1;
}
// This loop should probably be in another function.
for (d = 0; d < displayCount && keepgoing; d++) {
if (strcmp(argv[1], "get") == 0) {
if (!listCurrentMode(activeDisplays[d], d)) {
exitcode++;
}
} else if (strcmp(argv[1], "list") == 0) {
if (!listAvailableModes(activeDisplays[d], d)) {
exitcode++;
}
} else if (strcmp(argv[1], "set") == 0) {
if (d < (argc - 2)) {
if (strcmp(argv[d+2], "skip") == 0 && d < (argc - 2)) {
printf("Skipping display %d\n", d);
} else {
struct config newConfig;
if (parseStringConfig(argv[d + 2], &newConfig)) {
if (!configureDisplay(activeDisplays[d], &newConfig, d)) {
exitcode++;
}
} else {
exitcode++;
}
}
}
} else if (strcmp(argv[1], "-version") == 0) {
printf("screenresolution version %s\nLicensed under GPLv2\n", VERSION);
keepgoing = 0;
} else {
NSLog(CFSTR("I'm sorry %s. I'm afraid I can't do that"), getlogin());
exitcode++;
keepgoing = 0;
}
}
free(activeDisplays);
activeDisplays = NULL;
} else {
NSLog(CFSTR("%s"), "Incorrect command line");
exitcode++;
}
return exitcode > 0;
}
unsigned int listCurrentMode(CGDirectDisplayID display, int displayNum) {
unsigned int returncode = 1;
CGDisplayModeRef currentMode = CGDisplayCopyDisplayMode(display);
if (currentMode == NULL) {
NSLog(CFSTR("%s"), "Error: unable to copy current display mode");
returncode = 0;
}
NSLog(CFSTR("Display %d: %ux%ux%u@%.0f"),
displayNum,
CGDisplayModeGetWidth(currentMode),
CGDisplayModeGetHeight(currentMode),
bitDepth(currentMode),
CGDisplayModeGetRefreshRate(currentMode));
CGDisplayModeRelease(currentMode);
return returncode;
}
unsigned int listAvailableModes(CGDirectDisplayID display, int displayNum) {
unsigned int returncode = 1;
int numModes = 0;
int i;
CFArrayRef allModes = CGDisplayCopyAllDisplayModes(display, NULL);
if (allModes == NULL) {
returncode = 0;
}
numModes = CFArrayGetCount(allModes);
// sort the array of display modes
CFMutableArrayRef allModesSorted = CFArrayCreateMutableCopy(
kCFAllocatorDefault,
numModes,
allModes
);
CFArraySortValues(
allModesSorted,
CFRangeMake(0, CFArrayGetCount(allModesSorted)),
(CFComparatorFunction) _compareCFDisplayModes,
NULL
);
#ifndef LIST_DEBUG
if(displayNum != 0)
printf("\n\n");
printf("Available Modes on Display %d\n", displayNum);
#endif
CGDisplayModeRef mode;
int modesPerColumn = numModes / MODES_PER_LINE;
for (i = 0; (i < numModes) && returncode; i++) {
int rowNumber = (i / MODES_PER_LINE);
int idxDisplayMode = (i % MODES_PER_LINE) * modesPerColumn + rowNumber;
// if there are an even number of display modes to display,
// the last mode must have it's index decremented by 1
idxDisplayMode = MIN(idxDisplayMode, numModes - 1);
mode = (CGDisplayModeRef) CFArrayGetValueAtIndex(allModesSorted, idxDisplayMode);
// This formatting is functional but it ought to be done less poorly.
#ifndef LIST_DEBUG
if (i % MODES_PER_LINE == 0) {
printf(" ");
} else {
printf("\t");
}
char modestr [50];
sprintf(modestr, "%4lux%4lux%lu@%.0f",
CGDisplayModeGetWidth(mode),
CGDisplayModeGetHeight(mode),
bitDepth(mode),
CGDisplayModeGetRefreshRate(mode));
printf("%-20s ", modestr);
if(i % MODES_PER_LINE == MODES_PER_LINE - 1)
printf("\n");
#else
uint32_t ioflags = CGDisplayModeGetIOFlags(mode);
printf("display: %d %4lux%4lux%2lu@%.0f usable:%u ioflags:%4x valid:%u safe:%u default:%u",
displayNum,
CGDisplayModeGetWidth(mode),
CGDisplayModeGetHeight(mode),
bitDepth(mode),
CGDisplayModeGetRefreshRate(mode),
CGDisplayModeIsUsableForDesktopGUI(mode),
ioflags,
ioflags & kDisplayModeValidFlag ?1:0,
ioflags & kDisplayModeSafeFlag ?1:0,
ioflags & kDisplayModeDefaultFlag ?1:0 );
printf(" safety:%u alwaysshow:%u nevershow:%u notresize:%u requirepan:%u int:%u simul:%u",
ioflags & kDisplayModeSafetyFlags ?1:0,
ioflags & kDisplayModeAlwaysShowFlag ?1:0,
ioflags & kDisplayModeNeverShowFlag ?1:0,
ioflags & kDisplayModeNotResizeFlag ?1:0,
ioflags & kDisplayModeRequiresPanFlag ?1:0,
ioflags & kDisplayModeInterlacedFlag ?1:0,
ioflags & kDisplayModeSimulscanFlag ?1:0 );
printf(" builtin:%u notpreset:%u stretched:%u notgfxqual:%u valagnstdisp:%u tv:%u vldmirror:%u\n",
ioflags & kDisplayModeBuiltInFlag ?1:0,
ioflags & kDisplayModeNotPresetFlag ?1:0,
ioflags & kDisplayModeStretchedFlag ?1:0,
ioflags & kDisplayModeNotGraphicsQualityFlag ?1:0,
ioflags & kDisplayModeValidateAgainstDisplay ?1:0,
ioflags & kDisplayModeTelevisionFlag ?1:0,
ioflags & kDisplayModeValidForMirroringFlag ?1:0 );
#endif
}
CFRelease(allModes);
CFRelease(allModesSorted);
return returncode;
}