Re: CGShading
Re: CGShading
- Subject: Re: CGShading
- From: "John C. Randolph" <email@hidden>
- Date: Tue, 12 Oct 2004 13:29:38 -0700
On Oct 12, 2004, at 12:30 PM, R. Scott Thompson wrote:
Here's some sample code that creates a pretty cool gradient by
using a Category for NSImage:
<http://developer.apple.com/samplecode/Transformed_Image/
Transformed_Image.html>
When I wrote that code, CGShading wasn't available. If I were
writing that sample today, I'd use GCShading. I should also point
out that the code assumes that bytesPerRow == pixelsWide, which
isn't necessarily the case.
Correction: I meant to say it assumes that bytesPerRow ==
(pixelsWide * 4), which isn't necessarily true. In future versions
of AppKit and CoreImage, bitmaps may get padded to allow for word or
long word alignment for optimization.
Just a note, I don't think that CGShading will let you create the same
kind of gradient in the sample (at least not easily).
It can, you just need to use more than one gradient and composite one
over the other.
-jcr
John C. Randolph <email@hidden> (408) 974-8819
Sr. Cocoa Software Engineer,
Apple Worldwide Developer Relations
http://developer.apple.com/cocoa/index.html
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