如何将NSImage绘制到CGContext [英] How to draw NSImage to CGContext

问题描述

我有一个对象NSImage，我想将其绘制到CGContext. 我发现CGContext没有相应的方法，但是似乎有一个CGImage方法，剪辑

I have an object NSImage, which I want to draw to CGContext. I found that there is no corresponding method for CGContext, but there seems to be a CGImage method, clip

func clip(to: CGRect, mask: CGImage)

请问我该怎么做?

推荐答案

最简单的方法是创建一个NSGraphicsContext包装您的CGContext并绘制到其中:

The easiest way is to create an NSGraphicsContext wrapping your CGContext, and draw into that:

let gc: CGContext = ...
let nsImage: NSImage = ...
let rect: CGRect = ...

let priorNsgc = NSGraphicsContext.current
defer { NSGraphicsContext.current = priorNsgc }
NSGraphicsContext.current = NSGraphicsContext(cgContext: gc, flipped: false)
nsImage.draw(in: rect)

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