Re: Compositing to custom view in Cocoa
Re: Compositing to custom view in Cocoa
- Subject: Re: Compositing to custom view in Cocoa
- From: George Orthwein <email@hidden>
- Date: Fri, 30 Jun 2006 11:17:59 -0400
On Jun 30, 2006, at 10:36 AM, Kenny Millar wrote:
Because I need to change the foreground colour too, and every
location on
the 'screen' can have a different forground/background colour.
It would take two operations. You'd composite the text with
transparent background with a solid fill color as source, using
CompositeSourceIn. That colorizes the text and leaves the
transparency. Then you'd draw that over the background color. At
least, I think that should work. :)
If you can't add transparency, I just discovered -
colorizeByMappingGray:toColor:blackMapping:whiteMapping. It kinda
works for me but for some reason the white areas are using the gray
color instead of the specified white color. But I did end up with
custom back/foreground colors.
I'm surprised there is not an NSImage method for using a grayscale
image as a mask. Half the messages in the archives asking about this
topic reference CompositeSourceIn, but I see now that that will only
work if you already have some transparency. There do seem to be some
Quartz methods though:
http://developer.apple.com/documentation/GraphicsImaging/Conceptual/
drawingwithquartz2d/dq_images/chapter_12_section_6.html
Looks like a good candidate for an NSBitmapImageRef category. :)
(though I don't actually know how difficult using the quartz calls
would be...)
George
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