Re: Getting iPod icon, was Getting the network Machine Icon
Re: Getting iPod icon, was Getting the network Machine Icon
- Subject: Re: Getting iPod icon, was Getting the network Machine Icon
- From: Dave <email@hidden>
- Date: Mon, 26 Jan 2009 11:24:46 +0000
Opps! I sent this by mistake, I already found the solution this
weekend, I just changed the BitmapInfo to
kCGImageAlphaPremulitipledFirst and all is well!
Thanks a lot for your help, it's almost all working now.
All the Best
Dave
Hi Jean,
Thanks, I added the code you suggested and it basically works! I have
one small problem left in that the colors are shifted, I think the
routine I am returning the buffer to expects ARGB or BGRA and I am
returning the opposite! Typical!
Is there an easy way to get the pixels in the reverse order or do I
need to swap the bytes myself?
Thanks in Advance
All the Best
Dave
On 23 Jan 2009, at 19:27, Jean-Daniel Dupas wrote:
The requirement of the function I am writing has now changed
because I found a different way of doing it that requires much
less changes to the rest of the application. Basically there is a
framework of sorts that calls my function (GetIconImage), all I
have to do is to render the Icon into a BitMap/PixMap and then
return a pointer to it from my function, e.g. the function that
calls my function need to return a buffer that is width * height *
4 in size that contains the pixels and everything else will be
taken care of!
So, I if change the bit that computes the Row Bytes value so it is
(width * 4) and change the malloc to malloc(width * height * 4)
then just return myImageBufferPtr, this should be ok?
Yes. You should release the CGContext too. If you provide a buffer
when you create it (this is what you do), your are responsible to
free it, and so, releasing the bitmap context will not affect it.
Also, how to I free the memory allocated by myBitMapContextRef,
myIconRef and myIconFamily Icon? I can't seem to find dispose/
release functions for these objects.
All CG type are CoreFoundation objects. So you can use CFRelease to
free the bitmap context. There is also a CGContextRelease function
but the doc says that this function is equivalent to CFRelease,
except that it does not cause an error if the context parameter is
NULL.
For the IconRef, the function is ReleaseIconRef().
And the icon family is an handle, and should be freed using
DisposeHandl
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| References: | |
| | >Getting the network Machine Icon (From: Sandro Noel <email@hidden>) |
| | >Getting iPod icon, was Getting the network Machine Icon (From: Dave <email@hidden>) |
| | >Re: Getting iPod icon, was Getting the network Machine Icon (From: Russell Hancox <email@hidden>) |
| | >Re: Getting iPod icon, was Getting the network Machine Icon (From: Jean-Daniel Dupas <email@hidden>) |
| | >Re: Getting iPod icon, was Getting the network Machine Icon (From: "email@hidden" <email@hidden>) |
| | >Re: Getting iPod icon, was Getting the network Machine Icon (From: Dave <email@hidden>) |
| | >Re: Getting iPod icon, was Getting the network Machine Icon (From: Jean-Daniel Dupas <email@hidden>) |
| | >Re: Getting iPod icon, was Getting the network Machine Icon (From: Dave <email@hidden>) |
| | >Re: Getting iPod icon, was Getting the network Machine Icon (From: Jean-Daniel Dupas <email@hidden>) |
| | >Re: Getting iPod icon, was Getting the network Machine Icon (From: Dave <email@hidden>) |
| | >Re: Getting iPod icon, was Getting the network Machine Icon (From: Jean-Daniel Dupas <email@hidden>) |