ULTRIX Worksystem Software Guide to Developing Applications for the Display PostScript® System

This document, "Guide to Developing Applications for the Display PostScript® System" for ULTRIX Worksystem Software (UWS), Version 2.2, by Digital Equipment Corporation, is a technical manual for experienced C language programmers.

It serves as a guide for developing applications that leverage the Display PostScript system as an extension to Digital's UWS and the X Window System.

The manual covers:

• Introduction to Display PostScript (XDPS) in UWS: Explaining its imaging capabilities and how it integrates as an X server extension.
• Core Components and Concepts: Detailing the PostScript interpreter, Client Library, and the pswrap translation program, along with concepts like contexts (execution and text), memory spaces, and the interaction of X and PostScript coordinate systems.
• Application Development: Providing a step-by-step guide to designing, writing, compiling, linking, and debugging XDPS applications, including a sample program and Makefile examples for building.
• Advanced Topics: Discussing PostScript language encoding, client library buffering, server file access, coordinate conversions, handling window resizing (clipping path and user space origin), synchronization between Display PostScript and X, sharing contexts and spaces, and using color (color cubes and gray ramps).
• UWS-Specific Routines and Operators: Describing the Client Library routines and X-specific PostScript operators unique to the UWS implementation.

Essentially, it provides the necessary UWS-specific knowledge for developers to create graphical applications that use the device-independent PostScript imaging model within the X Window System environment on ULTRIX.