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#12.4. How can I get bitmaps created with 'image' to work with
'-stipple'?

At the moment, you can't.  Bitmaps created with 'image create bitmap
...' do not use 'Tk_DefineBitmap', which is required for '-stipple' to
know it's a bitmap.  Instead, you'll have to use the old format for
using bitmaps in stipples, like so:

.canvas create rect 10 10 80 80 -fill black -stipple @/path/to/my.bmp

It's not a simple C fix for the above problem, but it's on Sun's ToDo
list.