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Clarify postscriptUnderlinePosition #218

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merged 3 commits into from
Jun 27, 2023
Merged

Clarify postscriptUnderlinePosition #218

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4b9a7d2
Clarify postscriptUnderlinePosition
benkiel Jun 27, 2023
4b610e8
More url updates
benkiel Jun 27, 2023
91dd5a0
Correct FamRec spec
benkiel Jun 27, 2023
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21 changes: 11 additions & 10 deletions versions/ufo3/fontinfo.plist.md
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Expand Up @@ -286,7 +286,7 @@ Records should have a unique `nameID`, `platformID`, `encodingID` and `languageI
| postscriptSlantAngle | integer or float | Artificial slant angle. This must be an angle in counter-clockwise degrees from the vertical. This value is *not* the same as the italic angle. Font authoring tools may use this value to set the FontMatrix in Type 1/CFF table. |
| postscriptUniqueID | integer | A unique ID number as defined in the Type 1/CFF specification. |
| postscriptUnderlineThickness | integer or float | Underline thickness value. Corresponds to the Type 1/CFF/post table `UnderlineThickness` field. |
| postscriptUnderlinePosition | integer or float | Underline position value. Corresponds to the Type 1/CFF/post table `UnderlinePosition` field. |
| postscriptUnderlinePosition | integer or float | Underline position value. Corresponds to the Type 1/CFF table `UnderlinePosition` field. The post/CFF2 table `UnderlinePosition` should be calculated from this value by adding half of the `postscriptUnderlineThickness` to `postscriptUnderlinePosition`. |
| postscriptIsFixedPitch | boolean | Indicates if the font is monospaced. An authoring tool could calculate this automatically, but the designer may wish to override this setting. This corresponds to the Type 1/CFF `isFixedPitched` field |
| postscriptBlueValues | list | A list of up to 14 integers or floats specifying the values that should be in the Type 1/CFF BlueValues field. This list must contain an even number of integers following the rules defined in the Type 1/CFF specification. |
| postscriptOtherBlues | list | A list of up to 10 integers or floats specifying the values that should be in the Type 1/CFF OtherBlues field. This list must contain an even number of integers following the rules defined in the Type 1/CFF specification. |
Expand Down Expand Up @@ -343,6 +343,7 @@ Records should have a unique `nameID`, `platformID`, `encodingID` and `languageI
7. If `postscriptFullName` is not given, the Type 1/CFF `FullName` field can be created by combining the generic `familyName` and `styleName` attributes.
8. The Type 1/CFF/post table `italicAngle` field can be found at the generic `italicAngle` attribute.
9. The Type 1/CFF `postscriptWeightName` has no standard mapping to the `openTypeOS2WeightClass` value. The only official examples are given in [The OpenType OS/2 table specification.] This means that the value used is often up to the authoring tool or designer. It should be reasonable, e.g. "Medium" for a `openTypeOS2WeightClass` value of 500, "Bold" for a value of 700, etc.
10. The difference between CFF/Type1 underline position and post/CFF2 values is documented in [The OpenType post table specification.]

#### Macintosh FOND Resource Data

Expand Down Expand Up @@ -585,19 +586,19 @@ The guidelines are stored as dictionaries of the following format.

The guideline extends along `angle` to infinity in both directions out of the point defined by `x` and `y`. If `y` and `angle` are omitted, the element represents a vertical guideline. If `x` and `angle` are omitted, the element represents a horizontal guideline.

[The OpenType gasp table specification.]: http://www.microsoft.com/typography/otspec/gasp.htm
[The OpenType head table specification.]: http://www.microsoft.com/typography/otspec/head.htm
[The OpenType hhea table specification]: http://www.microsoft.com/typography/otspec/hhea.htm
[The OpenType name table specification.]: http://www.microsoft.com/typography/otspec/name.htm
[The OpenType OS/2 table specification.]: http://www.microsoft.com/typography/otspec/os2.htm
[The OpenType gasp table specification.]: https://learn.microsoft.com/en-us/typography/opentype/spec/gasp
[The OpenType head table specification.]: https://learn.microsoft.com/en-us/typography/opentype/spec/head
[The OpenType hhea table specification]: https://learn.microsoft.com/en-us/typography/opentype/spec/hhea
[The OpenType name table specification.]: https://learn.microsoft.com/en-us/typography/opentype/spec/name
[The OpenType OS/2 table specification.]: https://learn.microsoft.com/en-us/typography/opentype/spec/os2
[The Panose specification.]: https://monotype.github.io/panose/pan1.htm
[The OpenType vhea table specification]: http://www.microsoft.com/typography/otspec/vhea.htm
[The OpenType post table specification.]: http://www.microsoft.com/typography/otspec/post.htm
[The OpenType vhea table specification]: https://learn.microsoft.com/en-us/typography/opentype/spec/vhea
[The OpenType post table specification.]: https://learn.microsoft.com/en-us/typography/opentype/spec/post
[The Postscript Type 1 specification.]: https://adobe-type-tools.github.io/font-tech-notes/pdfs/T1_SPEC.pdf
[The CFF specification.]: https://adobe-type-tools.github.io/font-tech-notes/pdfs/5176.CFF.pdf
[Adobe FOND Specification]: https://adobe-type-tools.github.io/font-tech-notes/pdfs/0091.Mac_Fond.pdf
[Apple FOND Resource Specification]: http://developer.apple.com/documentation/mac/Text/Text-269.html
[Apple Font Family Record Specification]: http://developer.apple.com/documentation/mac/Text/Text-215.html
[Apple FOND Resource Specification]: https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6fond.html
[Apple Font Family Record Specification]: https://developer.apple.com/documentation/applicationservices/famrec
[The WOFF specification]: http://www.w3.org/TR/WOFF
[XML Property List]: ../conventions#propertylist
[color definition]: ../conventions#colors
Expand Down