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displayutil_listDisplays.m
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displayutil_listDisplays.m
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/*
displayutil - displayutil_listDisplays.m
list online displays
History:
v. 1.0.0 (04/01/2021) - Initial version
v. 1.0.1 (04/08/2021) - Add support for additional information available
through CGDisplayModeRef
v. 1.0.2 (09/03/2021) - Add support for display information about a specific
display
v. 1.0.3 (09/07/2021) - add bit depth and verbose mode support
v. 1.0.4 (09/09/2021) - list physical size, all available resolutions and
retina equivalents (as applicable) in verbose mode
v. 1.0.5 (09/12/2021) - default verbose mode to supported resolutions, add
extended mode to list all available resolutions using
public apis, and hidden mode to list all available
resolutions using private apis
Based on: https://gist.github.com/markandrewj/5a465e91bd29d9f9c9e0f84cedb2ca49
https://developer.apple.com/documentation/coregraphics/quartz_display_services
https://developer.apple.com/library/archive/documentation/GraphicsImaging/Conceptual/QuartzDisplayServicesConceptual/Articles/DisplayInfo.html
https://github.com/nriley/brightness/blob/master/brightness.c
https://github.com/avibrazil/RDM
Copyright (c) 2021 Sriranga R. Veeraraghavan <ranga@calalum.org>
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#import <stdlib.h>
#import <stdio.h>
#import <math.h>
#import <ApplicationServices/ApplicationServices.h>
#import <IOKit/graphics/IOGraphicsTypes.h>
#import "displayutil_display.h"
#import "displayutil_argutils.h"
#import "displayutil_listDisplays.h"
/*
CoreGraphics DisplayMode struct used in private APIs
see: https://github.com/robbertkl/ResolutionMenu/blob/master/Resolution%20Menu/DisplayModeMenuItem.m
*/
typedef struct
{
uint32_t modeNumber;
uint32_t flags;
uint32_t widthInPts;
uint32_t heightInPts;
uint32_t unknown1[2];
uint32_t bitDepth;
uint32_t unknown2[40];
uint16_t unknown3;
uint16_t freq;
uint32_t unknown4[2];
uint32_t widthInPixels;
uint32_t heightInPixels;
float density;
} CGSDisplayMode;
/*
CoreGraphics private APIs with support for scaled (retina) display modes
see: https://github.com/robbertkl/ResolutionMenu/blob/master/Resolution%20Menu/DisplayModeMenuItem.m
*/
void CGSGetNumberOfDisplayModes(CGDirectDisplayID display,
int *nModes);
void CGSGetDisplayModeDescriptionOfLength(CGDirectDisplayID display,
int idx,
CGSDisplayMode *mode,
int length);
/* struct to hold a display's properties */
typedef struct
{
UInt32 id;
size_t heightInPts;
size_t widthInPts;
size_t heightInPixels;
size_t widthInPixels;
double heightInMM;
double widthInMM;
double angle;
double refresh;
uint32_t modelNo;
uint32_t serialNo;
uint32_t vendor;
bool active;
bool builtin;
bool main;
bool mirrored;
bool accelerated;
bool uiCapable;
bool stereo;
} displayProperties_t;
/* strings to select list mode */
const char *gStrModeListDisplaysLong = "list";
const char *gStrModeListDisplaysShort = "ls";
/* constants for listing displays */
static const char *gStrDisplayMain = "main";
static const char *gStrDisplayInactive = "inactive";
static const char *gStrDisplayBuiltin = "builtin";
static const char *gStrDisplayAccelerated = "opengl";
static const char *gStrDisplayUICapable = "ui";
static const char *gStrDisplayMirrored = "mirrored";
static const char *gStrDisplayStereo = "stereo";
/* prototypes */
static bool getDisplayProperties(CGDirectDisplayID displayId,
displayProperties_t *props);
static bool printDisplayProps(CGDirectDisplayID display,
list_mode_t listMode);
static size_t getDisplayBitDepthForDisplayID(CGDirectDisplayID displayId);
static size_t getDisplayBitDepth(CGDisplayModeRef mode);
static CFComparisonResult compareCFDisplayModes(CGDisplayModeRef mode1,
CGDisplayModeRef mode2,
void *context);
static int compareCSGDisplayModes(const void *mode1,
const void *mode2);
/* private functions */
/*
getDisplayProperties - get the properties for the specified display
assumes that the specified displayId is valid
*/
static bool getDisplayProperties(CGDirectDisplayID displayId,
displayProperties_t *props)
{
CGDisplayModeRef mode;
CGSize size;
if (props == NULL)
{
return false;
}
props->id = CGDisplayUnitNumber(displayId);
props->heightInPts = CGDisplayPixelsHigh(displayId);
props->widthInPts = CGDisplayPixelsWide(displayId);
props->angle = CGDisplayRotation(displayId);
props->accelerated = CGDisplayUsesOpenGLAcceleration(displayId);
props->stereo = CGDisplayIsStereo(displayId);
props->builtin = CGDisplayIsBuiltin(displayId);
props->main = CGDisplayIsMain(displayId);
props->mirrored = CGDisplayIsInMirrorSet(displayId);
props->modelNo = CGDisplayModelNumber(displayId);
props->serialNo = CGDisplaySerialNumber(displayId);
props->vendor = CGDisplayVendorNumber(displayId);
size = CGDisplayScreenSize(displayId);
if (size.width > 0 && size.height > 0)
{
props->heightInMM = size.height;
props->widthInMM = size.width;
}
else
{
props->heightInMM = 0.0;
props->widthInMM = 0.0;
}
if (CGDisplayIsActive(displayId) == true &&
CGDisplayIsOnline(displayId) == true &&
CGDisplayIsAsleep(displayId) != true)
{
props->active = true;
}
else
{
props->active = false;
}
mode = CGDisplayCopyDisplayMode(displayId);
if (mode != NULL)
{
props->heightInPixels = CGDisplayModeGetPixelHeight(mode);
props->widthInPixels = CGDisplayModeGetPixelWidth(mode);
props->refresh = CGDisplayModeGetRefreshRate(mode);
props->uiCapable = CGDisplayModeIsUsableForDesktopGUI(mode);
CGDisplayModeRelease(mode);
}
else
{
props->heightInPixels = 0;
props->widthInPixels = 0;
props->refresh = 0;
props->uiCapable = false;
}
return true;
}
/*
getDisplayBitDepth - get a display's bit depth for the specified
display
*/
static size_t getDisplayBitDepthForDisplayID(CGDirectDisplayID displayId)
{
CGDisplayModeRef mode = NULL;
size_t depth = 0;
mode = CGDisplayCopyDisplayMode(displayId);
if (mode != NULL)
{
depth = getDisplayBitDepth(mode);
CGDisplayModeRelease(mode);
}
return depth;
}
/*
getDisplayBitDepth - get a display's bit depth for the specified
display mode
see: https://github.com/jhford/screenresolution/blob/master/cg_utils.c
https://stackoverflow.com/questions/8210824/how-to-avoid-cgdisplaymodecopypixelencoding-to-get-bpp
https://github.com/robbertkl/ResolutionMenu/blob/master/Resolution%20Menu/DisplayModeMenuItem.m
*/
static size_t getDisplayBitDepth(CGDisplayModeRef mode)
{
size_t depth = 0;
#ifdef HAVE_CP_PIXEL_ENC
CFStringRef pixelEncoding = NULL;
#else
CFDictionaryRef dict = NULL;
CFNumberRef num;
#endif /* HAVE_CP_PIXEL_ENC */
/* make sure a valid mode was specified */
if (mode == NULL)
{
return depth;
}
#ifdef HAVE_CP_PIXEL_ENC
/* get the bit depth from the pixel encoding (deprecated on 10.11+) */
pixelEncoding = CGDisplayModeCopyPixelEncoding(mode);
if (pixelEncoding == NULL)
{
return depth;
}
if (kCFCompareEqualTo == CFStringCompare(pixelEncoding,
CFSTR(IO1BitIndexedPixels),
kCFCompareCaseInsensitive))
{
depth = 1;
}
else if (kCFCompareEqualTo == CFStringCompare(pixelEncoding,
CFSTR(IO2BitIndexedPixels),
kCFCompareCaseInsensitive))
{
depth = 2;
}
else if (kCFCompareEqualTo == CFStringCompare(pixelEncoding,
CFSTR(IO4BitIndexedPixels),
kCFCompareCaseInsensitive))
{
depth = 4;
}
else if (kCFCompareEqualTo == CFStringCompare(pixelEncoding,
CFSTR(IO8BitIndexedPixels),
kCFCompareCaseInsensitive))
{
depth = 8;
}
else if (kCFCompareEqualTo == CFStringCompare(pixelEncoding,
CFSTR(IO16BitDirectPixels),
kCFCompareCaseInsensitive))
{
depth = 16;
}
else if (kCFCompareEqualTo == CFStringCompare(pixelEncoding,
CFSTR(kIO30BitDirectPixels),
kCFCompareCaseInsensitive))
{
depth = 30;
}
else if (kCFCompareEqualTo == CFStringCompare(pixelEncoding,
CFSTR(IO32BitDirectPixels),
kCFCompareCaseInsensitive))
{
depth = 32;
}
else if (kCFCompareEqualTo == CFStringCompare(pixelEncoding,
CFSTR(kIO16BitFloatPixels),
kCFCompareCaseInsensitive))
{
depth = 48;
}
else if (kCFCompareEqualTo == CFStringCompare(pixelEncoding,
CFSTR(kIO64BitDirectPixels),
kCFCompareCaseInsensitive))
{
depth = 64;
}
else if (kCFCompareEqualTo == CFStringCompare(pixelEncoding,
CFSTR(kIO32BitFloatPixels),
kCFCompareCaseInsensitive))
{
depth = 96;
}
CFRelease(pixelEncoding);
#else
dict = (CFDictionaryRef)*((int64_t *)mode + 2);
if (dict == NULL)
{
return depth;
}
if (CFGetTypeID(dict) == CFDictionaryGetTypeID() &&
CFDictionaryGetValueIfPresent(dict,
kCGDisplayBitsPerPixel,
(const void**)&num))
{
CFNumberGetValue(num, kCFNumberSInt32Type, (void*)&depth);
}
#endif /* HAVE_CP_PIXEL_ENC */
return depth;
}
/* printDisplayProps - print out a display's properties */
static bool printDisplayProps(CGDirectDisplayID display,
list_mode_t listMode)
{
displayProperties_t displayProps;
bool haveOpenBracket = false;
CGDisplayModeRef mode = NULL;
CFArrayRef allModes = NULL;
CFDictionaryRef options = NULL;
CFMutableArrayRef allModesSorted = NULL;
const CFStringRef dictkeys[] =
{kCGDisplayShowDuplicateLowResolutionModes};
const CFBooleanRef dictvalues[] =
{kCFBooleanTrue};
CGSDisplayMode *hiddenModes = NULL;
long numModes = 0, i = 0;
int numHiddenModes = 0, j = 0;
size_t bitDepth = 0;
size_t widthPixels = 0, widthPts = 0;
size_t heightPixels = 0, heightsPts = 0;
double screenSize = 0.0;
bool ret = false;
if (getDisplayProperties(display, &displayProps) != true)
{
fprintf(stderr,
"error: %s: %s\n",
gStrModeListDisplaysLong,
gStrErrGetDisplays);
return ret;
}
/* print out the display id */
fprintf(stdout, "0x%08X: ", display);
/* print out the dimensions of the display */
if (displayProps.heightInPixels > 0 &&
displayProps.widthInPixels > 0)
{
fprintf(stdout,
"%-4lu x %4lu",
displayProps.widthInPixels,
displayProps.heightInPixels);
}
else
{
fprintf(stdout,
"%-4lu x %4lu",
displayProps.widthInPts,
displayProps.heightInPts);
}
/* print out additional details if verbose out is requested */
if (listMode != LIST_SHORT)
{
/* if the bit depth is available, print it out */
bitDepth = getDisplayBitDepthForDisplayID(display);
if (bitDepth > 0)
{
fprintf(stdout," %lubit", bitDepth);
}
/* print out the display's refresh rate */
if (displayProps.refresh > 0)
{
fprintf(stdout, " @ %.0fHz", displayProps.refresh);
}
/* if the display is rotated, print out the rotation angle */
if (fpclassify(displayProps.angle) != FP_ZERO)
{
fprintf(stdout, " %3.1fdeg", displayProps.angle);
}
}
/* print out whether the display is the main display */
if (displayProps.main == true)
{
fprintf(stdout, " [%s", gStrDisplayMain);
haveOpenBracket = true;
}
/* print out whether the display is inactive */
if (displayProps.active == false)
{
if (haveOpenBracket == true)
{
fprintf(stdout, ", %s", gStrDisplayInactive);
}
else
{
fprintf(stdout, " [%s", gStrDisplayInactive);
haveOpenBracket = true;
}
}
/* print out whether the display is mirrored */
if (displayProps.mirrored == true)
{
if (haveOpenBracket == true)
{
fprintf(stdout, ", %s", gStrDisplayMirrored);
}
else
{
fprintf(stdout, " [%s", gStrDisplayMirrored);
haveOpenBracket = true;
}
}
/* print out whether the display is builtin */
if (displayProps.builtin == true)
{
if (haveOpenBracket == true)
{
fprintf(stdout, ", %s", gStrDisplayBuiltin);
}
else
{
fprintf(stdout, " [%s", gStrDisplayBuiltin);
haveOpenBracket = true;
}
}
/* print out whether the display is ui capable */
if (displayProps.uiCapable == true)
{
if (haveOpenBracket == true)
{
fprintf(stdout, ", %s", gStrDisplayUICapable);
}
else
{
fprintf(stdout, " [%s", gStrDisplayUICapable);
haveOpenBracket = true;
}
}
/* print out whether the display is accelerated */
if (displayProps.accelerated == true)
{
if (haveOpenBracket == true)
{
fprintf(stdout, ", %s", gStrDisplayAccelerated);
}
else
{
fprintf(stdout, " [%s", gStrDisplayAccelerated);
haveOpenBracket = true;
}
}
/* print out whether the display is in stereo mode */
if (displayProps.stereo == true)
{
if (haveOpenBracket == true)
{
fprintf(stdout, ", %s", gStrDisplayStereo);
}
else
{
fprintf(stdout, " [%s", gStrDisplayStereo);
haveOpenBracket = true;
}
}
if (haveOpenBracket)
{
fprintf(stdout,"]");
haveOpenBracket = false;
}
fprintf(stdout,"\n");
ret = true;
if (listMode == LIST_SHORT)
{
return ret;
}
/*
we are in verbose mode, so print out additional information
about this display
*/
fprintf(stdout, " ");
if (displayProps.widthInPts != displayProps.widthInPixels ||
displayProps.heightInPts != displayProps.heightInPixels)
{
fprintf(stdout,
"UI Appearance: %-4lu x %4lu\n",
displayProps.widthInPts,
displayProps.heightInPts);
fprintf(stdout, " ");
}
screenSize =
sqrt((displayProps.widthInMM * displayProps.widthInMM) +
(displayProps.heightInMM * displayProps.heightInMM)) / 25.4;
fprintf(stdout, "Physical size: %.1fin (%.1fmm x %.1fmm)\n",
screenSize,
displayProps.widthInMM,
displayProps.heightInMM);
fprintf(stdout, " ");
fprintf(stdout, "Model: 0x%04X", displayProps.modelNo);
fprintf(stdout, ", Vendor: 0x%04X", displayProps.vendor);
fprintf(stdout, ", Serial No.: 0x%08X", displayProps.serialNo);
fprintf(stdout, "\n");
/*
list all the hidden display modes for this display
see: https://github.com/robbertkl/ResolutionMenu/blob/master/Resolution%20Menu/DisplayModeMenuItem.m
*/
if (listMode == LIST_HIDDEN)
{
CGSGetNumberOfDisplayModes(display, &numHiddenModes);
if (numHiddenModes <= 0)
{
return ret;
}
hiddenModes = calloc((unsigned long)numHiddenModes,
sizeof(CGSDisplayMode));
if (hiddenModes == NULL)
{
return ret;
}
fprintf(stdout, " ");
fprintf(stdout,
"%d resolutions available:\n",
numHiddenModes);
for (j = 0; j < numHiddenModes; j++)
{
CGSGetDisplayModeDescriptionOfLength(display,
j,
&hiddenModes[j],
sizeof(CGSDisplayMode));
}
qsort(hiddenModes,
(size_t)numHiddenModes,
sizeof(CGSDisplayMode),
compareCSGDisplayModes);
for (j = 0; j < numHiddenModes; j++)
{
fprintf(stdout, " ");
fprintf(stdout,
"%-4u x %4u %ubit @ %dHz",
hiddenModes[j].widthInPixels,
hiddenModes[j].heightInPixels,
hiddenModes[j].bitDepth,
hiddenModes[j].freq);
if (hiddenModes[j].widthInPixels != hiddenModes[j].widthInPts ||
hiddenModes[j].heightInPts != hiddenModes[j].heightInPts)
{
fprintf(stdout,
" (UI Appearance: %-4u x %4u)",
hiddenModes[j].widthInPts,
hiddenModes[j].heightInPts);
}
fprintf(stdout, "\n");
}
if (hiddenModes != NULL)
{
free(hiddenModes);
}
return ret;
}
/*
list available resolutions
based on: https://github.com/jhford/screenresolution/blob/master/cg_utils.c
https://github.com/panda3d/panda3d/blob/master/panda/src/cocoadisplay/cocoaGraphicsWindow.mm
https://stackoverflow.com/questions/53595111/how-to-get-the-physical-display-resolution-on-macos
*/
/* get all the available display modes for this display */
if (listMode == LIST_EXTENDED)
{
options = CFDictionaryCreate(NULL,
(const void **)dictkeys,
(const void **)dictvalues,
1,
&kCFCopyStringDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
}
allModes = CGDisplayCopyAllDisplayModes(display, options);
if (options != NULL)
{
CFRelease(options);
}
if (allModes == NULL)
{
return ret;
}
/* get the number of modes */
numModes = CFArrayGetCount(allModes);
if (numModes <= 0)
{
CFRelease(allModes);
return ret;
}
/* sort the available display modes */
allModesSorted = CFArrayCreateMutableCopy(kCFAllocatorDefault,
numModes,
allModes);
if (allModesSorted == NULL)
{
CFRelease(allModes);
return ret;
}
CFArraySortValues(allModesSorted,
CFRangeMake(0, CFArrayGetCount(allModesSorted)),
(CFComparatorFunction)compareCFDisplayModes,
NULL);
/* list each available resolution */
fprintf(stdout, " ");
fprintf(stdout,
"%ld%s resolutions available:\n",
numModes,
(listMode == LIST_SUPPORTED ? " other" : ""));
for (i = 0; i < numModes; i++)
{
mode = (CGDisplayModeRef)CFArrayGetValueAtIndex(allModesSorted, i);
if (mode == NULL)
{
continue;
}
fprintf(stdout, " ");
widthPixels = CGDisplayModeGetPixelWidth(mode);
widthPts = CGDisplayModeGetWidth(mode);
heightPixels = CGDisplayModeGetPixelHeight(mode);
heightsPts = CGDisplayModeGetHeight(mode);
fprintf(stdout, "%-4lu x %4lu", widthPixels, heightPixels);
bitDepth = getDisplayBitDepth(mode);
if (bitDepth > 0)
{
fprintf(stdout, " %lubit", bitDepth);
}
fprintf(stdout, " @ %.0fHz",
CGDisplayModeGetRefreshRate(mode));
if (widthPixels != widthPts ||
heightPixels != heightsPts)
{
fprintf(stdout,
" (UI Appearance: %-4lu x %4lu)",
widthPts,
heightsPts);
}
fprintf(stdout, "\n");
}
if (allModesSorted != NULL)
{
CFRelease(allModesSorted);
}
if (allModes != NULL)
{
CFRelease(allModes);
}
return ret;
}
/*
compareCFDisplayModes - compare to display modes for sorting
based on: https://github.com/jhford/screenresolution/blob/master/cg_utils.c
*/
static CFComparisonResult compareCFDisplayModes(CGDisplayModeRef mode1,
CGDisplayModeRef mode2,
void *context)
{
size_t mode1Val = 0, mode2Val = 0;
double refreshRate1 = 0.0, refreshRate2 = 0.0;
/* check if both modes are non-NULL */
if (mode1 == NULL)
{
if (mode2 == NULL)
{
return kCFCompareEqualTo;
}
return kCFCompareGreaterThan;
}
if (mode2 == NULL)
{
return kCFCompareLessThan;
}
if (context != NULL)
{
/* TODO - handle a non-null context */
}
/* start by comparing the pixel widths of the two modes */
mode1Val = CGDisplayModeGetPixelWidth(mode1);
mode2Val = CGDisplayModeGetPixelWidth(mode2);
/*
if pixel widths aren't equal, return whether mode1's width is less
than mode2's
*/
if (mode1Val != mode2Val)
{
return (mode1Val < mode2Val ? kCFCompareLessThan :
kCFCompareGreaterThan);
}
/* the pixel widths are equal, compare the apparent widths */
mode1Val = CGDisplayModeGetWidth(mode1);
mode2Val = CGDisplayModeGetWidth(mode2);
/*
if apparent widths aren't equal, return whether mode1's apparent
width is less than mode2's
*/
if (mode1Val != mode2Val)
{
return (mode1Val < mode2Val ? kCFCompareLessThan :
kCFCompareGreaterThan);
}
/*
pixel widths and apparent widths are the same, compare the
pixel heights
*/
mode1Val = CGDisplayModeGetPixelHeight(mode1);
mode2Val = CGDisplayModeGetPixelHeight(mode2);
/*
if pixel heights aren't equal, return whether mode1's pixel
height is less than mode2's
*/
if (mode1Val != mode2Val)
{
return (mode1Val < mode2Val ? kCFCompareLessThan :
kCFCompareGreaterThan);
}
/*
pixel heights are equal, compare the apparent heights
*/
mode1Val = CGDisplayModeGetHeight(mode1);
mode2Val = CGDisplayModeGetHeight(mode2);
/*
if apparent heights aren't equal, return whether mode1's
apparent height is less than mode2's
*/
if (mode1Val != mode2Val)
{
return (mode1Val < mode2Val ? kCFCompareLessThan :
kCFCompareGreaterThan);
}
/* widths and heights are equal, compare the bit depths */
mode1Val = getDisplayBitDepth(mode1);
mode2Val = getDisplayBitDepth(mode2);
/*
if the bit depths aren't equal, return whether mode1's bit depth
is less than mode2's
*/
if (mode1Val != mode2Val)
{
return (mode1Val < mode2Val ? kCFCompareLessThan :
kCFCompareGreaterThan);
}
/* widths, heights, and bit depth are equal, compare refresh rates */
refreshRate1 = CGDisplayModeGetRefreshRate(mode1);
refreshRate2 = CGDisplayModeGetRefreshRate(mode2);
/* return whether mode1's refresh rate is less than mode2's */
return (islessequal(refreshRate1, refreshRate2) == 1 ?
kCFCompareLessThan :
kCFCompareGreaterThan);
}
/* compareCSGDisplayModes - compare to display modes for sorting */
static int compareCSGDisplayModes(const void *val1,
const void *val2)
{
uint32_t mode1Val = 0, mode2Val = 0;
uint16_t refreshRate1 = 0, refreshRate2 = 0;
CGSDisplayMode *mode1 = NULL, *mode2 = NULL;
/* check if both modes are non-NULL */
if (val1 == NULL)
{
if (val2 == NULL)
{
return 0;
}
return 1;
}
if (val2 == NULL)
{
return -1;
}
mode1 = (CGSDisplayMode *)val1;
mode2 = (CGSDisplayMode *)val2;
/* start by comparing the pixel widths of the two modes */
mode1Val = mode1->widthInPixels;
mode2Val = mode2->widthInPixels;
/*
if pixel widths aren't equal, return whether mode1's width is less
than mode2's
*/
if (mode1Val != mode2Val)
{
return (mode1Val < mode2Val ? -1 : 1);
}
/* the pixel widths are equal, compare the apparent widths */
mode1Val = mode1->widthInPts;
mode2Val = mode2->widthInPts;
/*
if apparent widths aren't equal, return whether mode1's apparent
width is less than mode2's
*/
if (mode1Val != mode2Val)
{
return (mode1Val < mode2Val ? -1 : 1);
}
/*
pixel widths and apparent widths are the same, compare the
pixel heights
*/
mode1Val = mode1->heightInPixels;
mode2Val = mode2->heightInPixels;
/*
if pixel heights aren't equal, return whether mode1's pixel
height is less than mode2's
*/
if (mode1Val != mode2Val)
{
return (mode1Val < mode2Val ? -1 : 1);
}
/*
pixel heights are equal, compare the apparent heights
*/
mode1Val = mode1->heightInPts;
mode2Val = mode2->heightInPts;
/*
if apparent heights aren't equal, return whether mode1's
apparent height is less than mode2's
*/
if (mode1Val != mode2Val)
{
return (mode1Val < mode2Val ? -1 : 1);