TIP 198: Image Command XPM Extension

EuroTcl/OpenACS 11 - 12 JULY 2024, VIENNA
Author:         R. Timothy Edwards <[email protected]>
Author:         Don Porter <[email protected]>
Author:         Kevin Kenny <[email protected]>
State:          Rejected
Type:           Project
Vote:           Done
Created:        12-May-2004
Tcl-Version:    8.7


This TIP proposes an extension to the Tk image command to incorporate color pixmap images based on the XPM format. The format is analogous to the bitmap option (tkImgBmap.c in the Tk source).


The "XPM" format has become more-or-less a standard, and is a nice text-readable color alternative to the standard X11 bitmap format. The runtime library for XPM is available in standard Linux distributions and elsewhere. Tk has a number of color photo image formats, but these make various assumptions about rendering. There is no color alternative to the simple pixel-based bitmap format.


This TIP specifies the extension of the image command in the following manner:

image create xpm name -file xpm_file

It would probably be a nice idea to include in-line pixmap specifications similar to that allowed for bitmaps by the BLT package. However, at this time, the reference implementation does not include such an extension.

Reference Implementation

There is an implementation in the source for XCircuithttp://xcircuit.ece.jhu.edu/ . The source file is "tkPixmap.c".


I'd like to see more justification in this proposal as to why a new image type is needed, rather than implementing a suitable format for either the existing bitmap or photo image types.

In fact, the Img extension already has XPM as a photo image format. I'm quite baffled as to the need for a new image type. Is this TIP better served by a request to promote XPM to the core set of supported formats?

2018-02-21 This TIP is best considered to be 'abandoned'. The two queries above had been presented to the original author shortly after the TIP was introduced, and he never replied either to them or to a repeat status inquiry by email. Our process doesn't really contemplate what to do when no TCT member agrees to sponsor a TIP. Accordingly, I'm going to exercise a peculiar parliamentary move and 'sponsor' it with an announced intention to vote NO. --kbk


This document has been placed in the public domain.