if(point.x <0|| point.y <0)returnnil;
CGImageRefimageRef =self.CGImage;
NSUIntegerwidth = CGImageGetWidth(imageRef);
NSUIntegerheight = CGImageGetHeight(imageRef);
if(point.x >= width || point.y >= height)returnnil;
unsignedchar*rawData =malloc(height*width*4);
if(!rawData)returnnil;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
NSUIntegerbytesPerPixel =4;
NSUIntegerbytesPerRow =bytesPerPixel*width;
NSUIntegerbitsPerComponent =8;
CGContextRef context = CGBitmapContextCreate(rawData,
width,
height,
bitsPerComponent,
bytesPerRow,
colorSpace,
kCGImageAlphaPremultipliedLast
|kCGBitmapByteOrder32Big);
if(!context) {
free(rawData);
return nil;
}
CGColorSpaceRelease(colorSpace);
CGContextDrawImage(context, CGRectMake(0,0, width, height), imageRef);
CGContextRelease(context);
intbyteIndex = (bytesPerRow * point.y) + point.x * bytesPerPixel;
CGFloatred = (rawData[byteIndex] *1.0) /255.0;
CGFloatgreen = (rawData[byteIndex+1] *1.0) /255.0;
CGFloatblue = (rawData[byteIndex+2] *1.0) /255.0;
CGFloatalpha = (rawData[byteIndex+3] *1.0) /255.0;
UIColor*result =nil;
result = [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
free(rawData);
returnresult;
