Draw an image in Additive Blend mode without using OpenGL

Question

I want to draw an image using additive blending mode. But I do not want to use OpenGL. I can’t find anything, maybe something in Quartz2D?

Can someone point me in the right direction?

Cheers, Rich

+3

Rich brooks Oct 11 '10 at 16:36

1 answer

Krzysztof Zabłocki · Accepted Answer · 2010-10-11T16:53:08+0000

Of course, there is a CGBlendMode enumeration that you can use to specify a blend operation. usage method:

CGContextSetBlendMode()

or

[image drawInRect:CGRectMake(0, 0, width, height) blendMode:mode alpha:1];