首页 > 代码库 > MACOS获得 CGContextRef 获得图片数据类型转换 NSImage、CIImage、CGImageRef
MACOS获得 CGContextRef 获得图片数据类型转换 NSImage、CIImage、CGImageRef
将NSImage转换为CIImage
#import <QuartzCore/CIFilter.h>
// convert NSImage to bitmap
NSImage * myImage = [self currentImage];
NSData * tiffData = http://www.mamicode.com/[myImage TIFFRepresentation];
NSBitmapImageRep * bitmap;
bitmap = [NSBitmapImageRep imageRepWithData:tiffData];
// create CIImage from bitmap
CIImage * ciImage = [[CIImage alloc] initWithBitmapImageRep:bitmap];
// create affine transform to flip CIImage
NSAffineTransform *affineTransform = [NSAffineTransform transform];
[affineTransform translateXBy:0 yBy:128];
[affineTransform scaleXBy:1 yBy:-1];
// create CIFilter with embedded affine transform
CIFilter *transform = [CIFilter filterWithName:@"CIAffineTransform"];
[transform setValue:ciImage forKey:@"inputImage"];
[transform setValue:affineTransform forKey:@"inputTransform"];
// get the new CIImage, flipped and ready to serve
CIImage * result = [transform valueForKey:@"outputImage"];
// draw to view
[result drawAtPoint: NSMakePoint ( 0,0 )
fromRect: NSMakeRect ( 0,0,128,128 )
operation: NSCompositeSourceOver
fraction: 1.0];
// cleanup
[ciImage release];
将CGImageRef转换为NSImage *
- (NSImage*) imageFromCGImageRef:(CGImageRef)image
{
NSRect imageRect = NSMakeRect(0.0, 0.0, 0.0, 0.0);
CGContextRef imageContext = nil;
NSImage* newImage = nil;
// Get the image dimensions.
imageRect.size.height = CGImageGetHeight(image);
imageRect.size.width = CGImageGetWidth(image);
// Create a new image to receive the Quartz image data.
newImage = [[[NSImage alloc] initWithSize:imageRect.size] autorelease];
[newImage lockFocus];
// Get the Quartz context and draw.
imageContext = (CGContextRef)[[NSGraphicsContext currentContext]
graphicsPort];
CGContextDrawImage(imageContext, *(CGRect*)&imageRect, image);
[newImage unlockFocus];
return newImage;
}
将NSImage *转换为CGImageRef
- (CGImageRef)nsImageToCGImageRef:(NSImage*)image;
{
NSData * imageData = http://www.mamicode.com/[image >
CGImageRef imageRef;
if(imageData)
{
CGImageSourceRef imageSource =
CGImageSourceCreateWithData(
(CFDataRef)imageData, NULL);
imageRef = CGImageSourceCreateImageAtIndex(
imageSource, 0, NULL);
}
return imageRef;
}