绘制到CGImageRef

weixin_33888907

于 2012-04-23 18:53:00 发布

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原文链接：http://www.cnblogs.com/pengyingh/articles/2466944.html

http://bbs.51cto.com/thread-842406-1-1.html

#define HIRESDEVICE (((int)rintf([[[UIScreen mainScreen] currentMode] size].width/[[UIScreen mainScreen] bounds].size.width )>1))

- (CGImageRef) blerg

{

CGFloat imageScale = (CGFloat)1.0;

CGFloat width = (CGFloat)180.0;

CGFloat height = (CGFloat)180.0;

if ( HIRESDEVICE )

      {

      imageScale = (CGFloat)2.0;

      }

// Create a bitmap graphics context of the given size

//

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

CGContextRef context = CGBitmapContextCreate(NULL, width * imageScale, height * imageScale, 8, 0, colorSpace, kCGImageAlphaPremultipliedLast);

// Draw ...

CGContextSetRGBFillColor(context, (CGFloat)0.0, (CGFloat)0.0, (CGFloat)0.0, (CGFloat)1.0 );

// …

// Get your image

CGImageRef cgImage = CGBitmapContextCreateImage(context);

CGColorSpaceRelease(colorSpace);

CGContextRelease(context);

return cgImage;

}