将nsImage*转换为cImageRef?

在上找到以下解决方案 this page :

NSImage* someImage;
// create the image somehow, load from file, draw into it...
CGImageSourceRef source;

source = CGImageSourceCreateWithData((CFDataRef)[someImage TIFFRepresentation], NULL);
CGImageRef maskRef =  CGImageSourceCreateImageAtIndex(source, 0, NULL);

所有的方法都是10.4+,所以你应该很好。

[这是很长的路。仅当您仍支持旧版本的OS X时才应执行此操作。如果您可以要求10.6或更高版本, just use the CGImage method 取而代之。

1. Create a CGBitmapContext.
2. Create an NSGraphicsContext for the bitmap context.
3. Set the graphics context as the current context.
4. Draw the image.
5. Create the CGImage from the contents of the bitmap context.
6. 释放位图上下文。

至于雪豹,你可以 ask the image to create a CGImage for you ,通过发送nsimage A CGImageForProposedRect:context:hints: 消息。

下面是一个更详细的使用方法 - CGImageForProposedRect:context:hints: :

NSImage *image = [NSImage imageNamed:@"image.jpg"];

NSRect imageRect = NSMakeRect(0, 0, image.size.width, image.size.height);

CGImageRef cgImage = [image CGImageForProposedRect:&imageRect context:NULL hints:nil];

只是用 CGImageForProposedRect:context:hints: ……

NSImage *image; // an image
NSGraphicsContext *context = [NSGraphicsContext currentContext];
CGRect imageCGRect = CGRectMake(0, 0, image.size.width, image.size.height);
NSRect imageRect = NSRectFromCGRect(imageCGRect);
CGImageRef imageRef = [image CGImageForProposedRect:&imageRect context:context hints:nil];