Re: cursor icon hotspots with PNG

["Jasper St. Pierre" <jstpierre mecheye net>]

Why not provide the hotspot information as a separate, editable file? That means that people don't have to go poking through some obscure PNG chunks to find and edit data they're looking for.

On Tue, Jul 15, 2014 at 2:09 AM, John Emmas <john creativepost co uk> wrote:

On 14/07/2014 13:35, Paul Davis wrote:

does anyone know of any good (i.e. non-hacky) ways to define/provide cursor icon hotspots with PNG files, the way one can with various other image formats more intended for this purpose?

Hi Paul,

I'm not massively familiar with PNG but according to its spec, the ancillary chunk contains a couple of 'text' fields which can be used for storing name/value pairs.  It would essentially be private data of course (i.e. non-portable) but would that help you at all?  (if the data isn't present you simply assume 0,0 as the hotspot).

According to Wikipedia there have been several extensions to the original PNG format but AFAICT none of them seem to offer this, which is quite weird...

John

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  Jasper