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