Marti suggested to use the cmsReadTad and cmsWriteTag -- good idea!
This is proving a little difficult, however, in C#, given my humble level of
system programming.
So far, I have declared the call this way:
[DllImport(@lcms2Path)]
public static extern IntPtr cmsReadTag(IntPtr hProfile, uint
cmsTagSignature);
(Table 21 does not specify the type of cmsTagSignature so I am inferring
Unsigned Integer, 32bits, type)
Then, in my code, I call the function this way:
IntPtr Pointer = IntPtr.Zero;
Pointer = cmsReadTag (hDestination, 0x77747074); // 0x77747074 =
MediaWhitePointTag
I have not run that code YET but I assume it will run fine, up to this
point, which is where I have to access the memory area pointed to by
"Pointer"?
My CIEXYZ structure, to hold the data, is declared this way:
public struct MyCIEXYZ
{
public double X; // cmsFloat64Number,
public double Y; // MS says double type = 64bit double
precision IEEE 754 format ?
public double Z; // is it OK to use double?
}
Then, I create an instance of myCIEXYZ this way, after receiving the Pointer
from cmsReadTag:
MyCIEXYZ MediaWhitePoint;
The problem is that, beyond this point, I have no idea how to access the
parsed data using the returned Pointer in C#?
It gets complicated. There is the business of "declaring" UnsafeCode and,
possibly, "pinning" area of memory.
I would appreciate some guidance, if possible.
Keep in mind that, later, I am going to have to find a way to send my
modified CIE XYZ data *to* the profile, through the cmsWrite() function!
This is going to be interesting...
I will continue my research on my own but, in the meantime, any help is
appreciated.
/ Roger Breton
------------------------------
just use cmsReadTag and cmsWriteTag.
Please note white point only affects absolute colorimetric intent.
Regards
Marti
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