GDDM V3R2 Base Application Programming Guide
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Device considerations for image functions

GDDM V3R2 Base Application Programming Guide
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For all display devices, other than the IBM 3193, that support the use of graphics, GDDM performs all image transforms and output by emulation. If you write an image processing application that is likely to be used on such devices, you need to give consideration to the reduced performance that this emulation entails.

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