Inside Macintosh: QuickTime /

Chapter 3 - Image Compression Manager / Image Compression Manager Reference

Image Compression Manager Functions / Working With Images

GetImageDescriptionCTable

Your application may use the GetImageDescriptionCTable function to set the custom color table for an image.

pascal OSErr GetImageDescriptionCTable 
                              (ImageDescriptionHandle desc, 
                               CTabHandle *ctable);

desc

Contains a handle to the appropriate image description structure.

ctable

Contains a pointer to a field that is to receive a color table handle. The GetImageDescriptionCTable function returns the color table for the image described by the image description structure that is referred to by the desc parameter. The function correctly sizes the handle for the color table it returns.

DESCRIPTION

The Image Compression Manager stores the custom color table for an image in the appropriate image description structure. Your application must use QuickDraw's DisposeCTable routine to free the color table. (For details on DisposeCTable, see Inside Macintosh: Imaging.)

SPECIAL CONSIDERATIONS

If you want to find out if there is a custom color table, you should check the size of
the CTSize or CTSeed fields in the returned ctable parameter. If CTSize is 0 or if the CTSeed field is less than 0, then the color table is not a custom color table for that image.

RESULT CODES

noErr	0	No error
paramErr	-50	Invalid parameter specified
memFullErr	-108	Not enough memory available
noCodecErr	-8961	The Image Compression Manager could not find the specified compressor

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