NSCursor当我在alpha 通道中创建自定义时，Objective-C蒙版出现XOR在下面的屏幕上。我期望 alpha 通道值为零是透明的，而不是XOR下面的图形。我确定我的掩码数据在透明和不透明的ARGB地方是正确的。我究竟做错了什么？A=0A=255
static void maincustomcursor(bigmap *thedata, point hotspot)
{
NSPoint thepoint;
NSImage *newimage;
NSCursor *thecursor;
CGImageRef theimage;
CGBitmapInfo theinfo;
CGContextRef thecont;
CGColorSpaceRef thecolor;
int width, height, across;
width = (*thedata).width;
height = (*thedata).height;
if (width != smalliconsize || height != smalliconsize) return;
if (hotspot.h < 0) hotspot.h = 0;
if (hotspot.h >= smalliconsize) hotspot.h = smalliconsize - 1;
if (hotspot.v < 0) hotspot.v = 0;
if (hotspot.v >= smalliconsize) hotspot.v = smalliconsize - 1;
thepoint = NSMakePoint(hotspot.h, hotspot.v);
across = (*thedata).rowbytes;
thecolor = CGColorSpaceCreateDeviceRGB();
theinfo = (CGBitmapInfo)kCGImageAlphaPremultipliedFirst;
thecont = CGBitmapContextCreate((*thedata).baseaddr, width, height, 8, across, thecolor, theinfo);
theimage = CGBitmapContextCreateImage(thecont);
newimage = [[NSImage alloc] initWithCGImage:theimage size:NSZeroSize];
thecursor = [[NSCursor alloc] initWithImage:newimage hotSpot:thepoint];
[thecursor set];
[thecursor release];
[newimage release];
CGImageRelease(theimage);
CGContextRelease(thecont);
CGColorSpaceRelease(thecolor);
}