ISO/IEC 9636-2:1991 PDF

Information technology — Computer graphics — Interfacing techniques for dialogues with graphical devices (CGI) — Functional specification — Part 2: Control

First page of standard ISO/IEC 9636-2:1991

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Title (English):

ISO/IEC 9636-2:1991

Information technology — Computer graphics — Interfacing techniques for dialogues with graphical devices (CGI) — Functional specification — Part 2: Control

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 44
Publication date:: December 18, 1991
Edition:: ISO/IEC IS 9636 edition 1 version 1
ICS:: 35.140

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Description (English):

Describes those functions of the interface concerned with virtual device management, coordinate space control, and error control. Annexes A and B form an integral part of this standard. Annex C is for information only.

Technical details

Technical committee: ISO/IEC JTC 1/SC 24 - Computer graphics, image processing and environmental data representation
SKU: ISO/IEC 9636-2:1991

Abstract

Overview

ISO/IEC 9636-2:1991 is Part 2 of the Computer Graphics Interface (CGI) functional specification. It defines the control functions for CGI, focusing on managing the graphical image and the interaction between graphical and non‑graphical parts of an interface. The standard covers virtual device management, coordinate space control and error control, and is intended to be used together with other parts of ISO/IEC 9636 (Part 1 overview/profiles/conformance; Parts 3–6 for output, segments, input/echoing and raster).

Annexes A and B are integral to the standard; Annex C is informative.

Key topics and technical requirements

Virtual Device Management
- Lifecycle functions (initialize, terminate), device control, drawing surface preparation, deferral mode and execution of deferred actions.
- Support for INPUT, OUTPUT and OUTIN virtual devices.
Coordinate Space Control
- Concepts and control of the Virtual Device Coordinate (VDC) system, device coordinates, device viewport and viewport mapping.
- VDC extent, tailoring, VDC space/range and drawing surface clipping.
- Specification modes and mapping behavior for translating VDC to device coordinates.
Error Control
- Error reporting and dequeuing error reports, error handling control and guidance for implementors (annex on control errors).
Precision and Miscellaneous Control
- Numerical precision requirements for integer and real VDCs, index and colour precision, client‑specified name precision.
- Escape and get‑escape mechanisms, message handling, and inquiry concepts.
Inquiry & State
- Control inquiry functions and description tables: device identity and description tables, control description table, function/profile support and control state lists (inquire control state, current precision requirements, VDC-to-device mapping, error handling state).

Practical applications

Graphics system implementors: Implement CGI‑compliant APIs or device drivers that need standardized control of virtual devices and coordinate mapping.
Device manufacturers: Define how raster or vector devices accept CGI control messages, map VDCs to device viewports and report error states.
Software developers: Build cross‑platform graphics applications that interact with CGI virtual devices for consistent coordinate mapping and error semantics.
Standards and conformance testers: Verify compliance with CGI control functions, state lists and inquiry behaviors.

Who uses this standard

Graphics API designers, device driver engineers, CAD/CAM and visualization software teams, standards bodies and test labs requiring a stable functional specification for device control, coordinate systems and error handling in computer graphics.

Related standards

ISO/IEC 9636-1:1991 - Overview, profiles and conformance (companion document)
ISO/IEC 9636 Parts 3–6 - Output, Segments, Input & Echoing, Raster
ISO 2382-13:1984 - Vocabulary (computer graphics)

Related standards

Standards mentioned in the description

Abstract

Overview

Annexes A and B are integral to the standard; Annex C is informative.

Key topics and technical requirements

Virtual Device Management
- Lifecycle functions (initialize, terminate), device control, drawing surface preparation, deferral mode and execution of deferred actions.
- Support for INPUT, OUTPUT and OUTIN virtual devices.
Coordinate Space Control
- Concepts and control of the Virtual Device Coordinate (VDC) system, device coordinates, device viewport and viewport mapping.
- VDC extent, tailoring, VDC space/range and drawing surface clipping.
- Specification modes and mapping behavior for translating VDC to device coordinates.
Error Control
- Error reporting and dequeuing error reports, error handling control and guidance for implementors (annex on control errors).
Precision and Miscellaneous Control
- Numerical precision requirements for integer and real VDCs, index and colour precision, client‑specified name precision.
- Escape and get‑escape mechanisms, message handling, and inquiry concepts.
Inquiry & State
- Control inquiry functions and description tables: device identity and description tables, control description table, function/profile support and control state lists (inquire control state, current precision requirements, VDC-to-device mapping, error handling state).

Practical applications

Graphics system implementors: Implement CGI‑compliant APIs or device drivers that need standardized control of virtual devices and coordinate mapping.
Device manufacturers: Define how raster or vector devices accept CGI control messages, map VDCs to device viewports and report error states.
Software developers: Build cross‑platform graphics applications that interact with CGI virtual devices for consistent coordinate mapping and error semantics.
Standards and conformance testers: Verify compliance with CGI control functions, state lists and inquiry behaviors.

Who uses this standard

Graphics API designers, device driver engineers, CAD/CAM and visualization software teams, standards bodies and test labs requiring a stable functional specification for device control, coordinate systems and error handling in computer graphics.

Related standards

ISO/IEC 9636-1:1991 - Overview, profiles and conformance (companion document)
ISO/IEC 9636 Parts 3–6 - Output, Segments, Input & Echoing, Raster
ISO 2382-13:1984 - Vocabulary (computer graphics)

ISO/IEC 9636-2:1991 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Practical applications

Who uses this standard

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Practical applications

Who uses this standard

Related standards

Related standards

Information technology — Computer graphics — Interfacing techniques for dialogues with graphical devices (CGI…

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