## Display Device Driver Reference for OS/2

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### Monochrome Expansion Blts

These BitBlts are used when drawing text in the software-drawing code. The principle difference between software-drawing mode and hardware-drawing mode routines in FFBLTPD.ASM is that text blts are from bottom-left to top- right, while pattern blts are from top-left to bottom-right. These routines are also optimized for text.

    The following routines handle monochrome expansion with both a
    foreground and background mix:

    FFBLTPX.ASM
            eddf_MESSPatExp16
            eddf_MESSPatExp81
            eddf_MESSPatExp24
            eddf_MESSPatExp41
            eddf_MESSPatExp11

    The following routines handle monochrome expansion with a foreground mix
    and transparent background:

            eddf_MESSPatExpFg16
            eddf_MESSPatExpFg81
            eddf_MESSPatExpFg24
            eddf_MESSPatExpFg41
            eddf_MESSPatExpFg11