<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> </head> <body><div class="auto-created-dir-div" style="unicode-bidi: embed;" dir="ltr"><p><span style="display: inline;float: none;background-color: rgb(255,255,255);color: rgb(0,0,0);font-family: arial , sans-serif;font-size: 16.0px;font-style: normal;font-variant: normal;font-weight: 400;letter-spacing: normal;orphans: 2;text-align: left;text-decoration: none;text-indent: 0.0px;text-transform: none;word-spacing: 0.0px;">Earlier today I wrote as follows.<br><br></span>> On a different aspect of the specification, originally if one used FFFF as the colour index it allowed the colour actually used to be set by the end user as the foreground colour. Does the system now allow/ will you please consider allowing, similar 'tunnel through' colours, so that there would be a feature whereby an end user could also select in an application first decoration colour and second decoration colour so that, say, one could have, for example, a font with some glyphs of holly with berries and the end user could choose to have green leaves with red berries or gold leaves with silver berries or whatever colour combination desired, with the way that the specification is done such that there is a default colour? So, for example, displaying the glyphs in an application that does not have a decoration colour choosing facility, or it is switched off, the holly appears as green leaves with red berries yet the colours can be chosen by the end user in applications where a decoration colour choosing facility is available and switched on.</p><p><br></p><p>Thinking further on this, it would appear that there are (at least) three aspects to implementing this.</p><p><br></p><p>The first is the Specification.</p><p><br></p><p>The second is implementation in fontmaking software.</p><p><br></p><p>The third is implementation in application software such as a desktop publishing program.</p><p><br></p><p>I have done some scientific programming, though it was many years ago, and my speciality was in providing programming advice to undergraduate students so I was reasonably knowledgeable of programming for that purpose, but I was not really deeply into things like the advanced parts of C++. I have no experience in producing large commercial software packages such as fontmaking programs or desktop publishing programs. So, within those limitations, and not willing to say that something can be done if I cannot do it myself, here are my thoughts on the implementations, expressed as if questions which hopefully some participants here might answer please.</p><p><br></p><p>If my idea of decoration colours were implemented, with, say, decoration colour 1 as FFFE default colour green and decoration colour 2 as FFFD default colour red, would that be straightforward to implement in a fontmaking program please? I am thinking that the colour palette dialogue panel in a fontmaking program could have buttons for</p><p><br></p><p>dec col 1</p><p><br></p><p>and</p><p><br></p><p>dec col 2</p><p><br></p><p>and they would each show the respective default colour, and that could be customized by a font designer for a particular font.</p><p><br></p><p>Would such customization be straightforwardly programmable by the person producing the fontmaking software package? Is it much the same as customizing any other colour in the palette, the only difference being that the other colour palette members would have low numbers and these two colour palette members would have the fixed numbers as in the specification? So to the font, would they just be colours, it is just that an application program with decoration colour choosing capability available and switched on would recognise them?</p><p><br></p><p>In a desktop publishing program, would the software package programmer be able to add in the menus for the selection of decoration colours fairly straightforwardly by using copies of the software already used for selecting text foreground colour? How difficult would it be to recognise FFFE and FFFD colour codes in a font and substitute the end user selecting colours in the display?</p><p><br></p><p>A consideration is whether having FFFE and FFFD colours in a font that is used in a COLRv0 system setting would work satisfactorily. Could someone who understands how the specification works in detail possibly comment on this please?</p><p><br></p><p>William Overington</p><p style="color: rgb(0,0,0);font-family: arial , sans-serif;font-size: 16.0px;font-style: normal;font-variant: normal;font-weight: 400;letter-spacing: normal;line-height: normal;margin-bottom: 0.0px;margin-left: 0.0px;margin-right: 0.0px;margin-top: 0.0px;orphans: 2;text-align: left;text-decoration: none;text-indent: 0.0px;text-transform: none;word-spacing: 0.0px;"><br style=""></p><p style="color: rgb(0,0,0);font-family: arial , sans-serif;font-size: 16.0px;font-style: normal;font-variant: normal;font-weight: 400;letter-spacing: normal;line-height: normal;margin-bottom: 0.0px;margin-left: 0.0px;margin-right: 0.0px;margin-top: 0.0px;orphans: 2;text-align: left;text-decoration: none;text-indent: 0.0px;text-transform: none;word-spacing: 0.0px;">Friday 22 January 2021</p><p><b></b><i></i><u></u><sub></sub><sup></sup><strike></strike><br></p><p><br></p></div> </body></html>