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Re: How to convert an image to an icon or IconRef programmatically?


On 28 Feb 2005, at 17:56, Mark Wagner wrote:

On Fri, 25 Feb 2005 17:47:36 -0800, David McLeod <email@hidden> wrote:
On Feb 1, 2005, at 11:04 AM, Laurence Harris wrote:
On 2/1/05 6:12 AM, Liang Yu didst favor us with: 
Thank you very much for your reply.

I think it should have some simple solution, but it seems it is a bit
complicated. Unfortunately, the icon graphics I used can only be
provided in Windows BMP format. Is there any way to do it? 

Maybe, but BMP is more of a Windows thing, so the solutions are not
going to
be as simple as they would be if you were using PNG or JPEG. If I had
to
support both platforms with one image format, I'd definitely use PNG
files
and do what Jerry suggested, except I don't know how to handle
disabling and
selected states with a CGImageRef.

The bad news is that the operations we perform on images to make them
appear disabled and/or selected are private (and there's no magic bit
for this one). I created a bug to publicize the lower level operations,
but I think that the request was deferred to a later release. 

If you're interested in faking it, I've found that lightening an image
halfway to white is a good imitation of the "disabled" state, and
darkening it halfway to black is a good imitation of "selected".

A long time ago, there used to be sample code from Apple which did exactly this for drawing icons, so it's sort of official (for 1986 or something).

Jerry

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