On Feb 23, 2006, at 7:14 PM, Charles Yeomans wrote:
On Feb 23, 2006, at 4:25 PM, Mike Woodworth wrote:
still im getting gibberish for the pixeltype. i was hoping to see
this work before i start digging around in the baseaddr more, but
i'm starting to wonder if RB isnt properly setting it?
I don't think the problem is with Rb. First, GetGWorldPixMap
returns a PixMapHandle. So to get at the PixMap, you need to
perform an additional dereference.
dim pixmapHandle as MemoryBlock = GetGWorldPixMap(cgrafptr)
dim pixMapPointer as MemoryBlock = pixmapHandle.Ptr(0)
Now, the pixelFormat field is indeed at offset 38; inspection
reveals its integer value (for a JPEG file I opened) to be 32.
That certainly does not look like a FourCharCode, and in fact it's
not. To figure out what it means, you turn to the header file
QuickDraw.h, from which we learn that some basic pixel formats are
represented not as FourCharCodes, but as integers. Here, 32 =
k32ARGBPixelFormat. I assume that this is a standard Mac format.
charles... you're great. so in fact i was getting the 32 as well...
i just don't trust my declare skills enough to assume i've done
things right and the documentation is wrong.
now i'm off to dig through the baseaddr.
thanks,
mike
--
Mike Woodworth
[EMAIL PROTECTED]
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