Drawing Operations

Many accessibility aids need to track Windows drawing operations. You should follow these guidelines to ensure compatibility with those aids:

Draw text using standard graphics device interface (GDI) functions for text output, such as ExtTextOut.
If you use DirectDraw, Display Control Interface (DCI), WinG, or other means of bypassing GDI drawing functions, provide an option that allows the GDI functions to be used instead.
Label any bitmapped text using tooltip controls or draw the name invisibly when a screen review utility is present.
Copy and erase text and graphics using standard GDI functions, such as BitBlt, PatBlt, and StretchBlt, rather than modifying memory directly.