AcademySoftwareFoundation/openexr

feature request: signed strides

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#614 opened on Nov 18, 2019

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Feature Requesthelp wanted

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Description

Frame buffer slice strides are non-negative as per: https://github.com/openexr/openexr/blob/d778a0b47b18fe1ede3824fe013cea9dd7404360/OpenEXR/IlmImf/ImfFrameBuffer.h#L98-L99

Negative strides could be useful for flipping images at I/O time.

Would it be possible to change size_t to ssize_t at the next ABI-break-point?

Contributor guide

Research direction
Examine the ImfFrameBuffer.h header to understand the current usage of size t for strides. Determine how to change the type to ssize t without breaking the API and consider adding a compile time flag for backward compatibility. Update all internal usages and test with negative strides to ensure flipping works.
Tech stack
c
Domain
computer graphics
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60