Saving and Restoring a Presentation Space

You can save certain attributes and resources of a presentation space, modify its fields, draw in the modified presentation space, then restore it with GpiSavePS and GpiRestorePS. When you call GpiSavePS, the graphics engine copies the following items from the current presentation space onto a special stack:

• Primitive attributes
  
• Transformation matrixes
  
• Viewing limit
  
• Clip path
  
• Clip region
  
• Current position
  
• Loaded logical color table
  
• Loaded logical font

You can push the contents of a presentation space on the stack as many times as is necessary. GpiRestorePS pops the contents of a presentation space off the stack.