## Presentation Device Driver Reference for OS/2

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### Design Considerations for All Drivers

This chapter describes various design considerations involved in creating a presentation driver. The following list includes the topics covered in this chapter:

Angles
Bounds computations
Clipping
Closing figures in areas and paths
Coordinate values
Positions within text functions
Return codes
Transform matrix values
Allocating Memory
Error Strategy
Presentation Manager Error Codes
Exit List Processing
Per-Thread Exception Management
Using Macro Assembler Instructions
Protecting Objects or Device Contexts