It seems that CGContextDrawImage(CGContextRef, CGRect, CGImageRef) performs MUCH WORSE when drawing a CGImage that was created by CoreGraphics (i.e. with CGBitmapContextCreateImage) than it does when drawing the CGImage which backs a UIImage. See this testing method:It seems that CGContextDrawImage(CGContextRef,
阅读背景：
CGContextDrawImage在绘制了大的UIImage之后非常慢。
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