Another View of the GDI / DDI Interaction

I/O Manager

IoXxx

support routines

Application

Subsystem

Win32 Subsystem

System Services

user mode

kernel mode

handle ("video" file object)

DDI drivers

display

driver

GDI

EngXxx

routines

video port driver's

VideoPortXxx

system hardware

video adapter

frame buffer

2vidlayr

video

miniport driver

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