[Cuis-dev] TrueType font import problems

[Juan Vuletich]

Hi Bernhard,

I pushed your fix to support V2 headers.

But I also did a few more things. When importing fonts like Optima, 
ExtraBlack and other styles beyond regular / italic / bold / bold italic 
will be turned into different FontFamilies.

I also changed the handling of fonts and sizes in TextEditors quite a 
bit. I think it is nicer now.

Please pull, update, and test.

Thanks,


On 8/27/2023 5:23 AM, Bernhard Pieber via Cuis-dev wrote:
> Here is a slightly improved version.
>
>
>
>> Am 26.08.2023 um 20:59 schrieb Bernhard Pieber via Cuis-dev<cuis-dev at lists.cuis.st>:
>>
>> Hi everyone,
>>
>> I tried importing a TrueType font I had on my system (Optima.ttc). I copied the file to a new folder named Fonts and used the following:
>> TrueTypeFontFamily readAllTrueTypeFontsIn: DirectoryEntry currentDirectory / 'Fonts'
>>
>> This resulted in the error "This TTF Collection has an unsupported header version“ in TTFontReader>>#readTTCFontFrom:.
>>
>> The reason is that the font uses a TTC Header Version 2.0, see:
>> https://docs.fileformat.com/font/ttc/
>>
>> I changed the code to allow both header versions. If I understand the difference between version 1 and 2 of the header formats correctly, this should be a safe change. Installing the font worked with this change.
>>
>> However, instead of Optima Regular it used Optima ExtraBlack when I selected Optima as the font. I found no way to select Optimal Regular as the font style.
>>
>> Optima.ttc contains five styles:
>> Optima Regular
>> Optima Italic
>> Optima Bold
>> Optima Bold Italic
>> Optima ExtraBlack
>>
>> The code for importing the TTC file imports all 5 styles:
>> TTFontReader readTTCFrom: (DirectoryEntry currentDirectory / 'Fonts' // 'Optima.ttc') binaryContents.
>>
>> However, only 4 of those 5 are saved in the font family:
>> TrueTypeFontFamily availableFamilies at: 'Optima'
>>
>> There seems to be a restriction TrueTypeFontFamily that there can only be one font variant per TextEmphasis combination.
>>
>> As a workaround I changed TTFontDescription>>#emphasis to identify Black as Bold. Now Optima Regular is used as default. However, I cannot use Optima Bold now.
>>
>> I attach the ChangeSet with the fix and the workaround.
>>
>> Given that we use only TrueType fonts now, I think the best solution would be to remove bold an italic from TextEmphasis and use the all variants of the TrueType font families instead.
>>
>> By the way, is there a package with a nice font viewer?
>>
>> Cheers,
>> Bernhard
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Juan Vuletich
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