remove FontTools to list named instances

[typemytype]

fixing #584

[justvanrossum]

Alternatively, we could try to use CTFontDescriptorCreateCopyWithAttributes to set the url on the descriptors, after this line:

drawbot/drawBot/context/baseContext.py

Line 3033 in 5936dd4

descriptors = CoreText.CTFontManagerCreateFontDescriptorsFromData(data)

[typemytype]

I tried that but did not succeed to add the url in a font descriptor... some attributes are lost while converting from CTFonts to fontDescriptors:

# run the script once
# edit the font on disk (different mod time is enough) 

path = 'pathToFont.ttf'


from drawBot.context.baseContext import getFontDescriptorsFromPath
import CoreText

descriptors = getFontDescriptorsFromPath(path)

url = CoreText.CTFontDescriptorCopyAttribute(descriptors[0], CoreText.kCTFontURLAttribute)
print(url)

# convert to CTFont
ctfont = CoreText.CTFontCreateWithFontDescriptor(descriptors[0], 10, None)

# convert back to a font descriptor
url = CoreText.CTFontDescriptorCopyAttribute(ctfont.fontDescriptor(), CoreText.kCTFontURLAttribute)
print(url)

[justvanrossum]

That's not what I see happening with this snippet. On the first run it prints the path in both cases, and when I change the font, it prints None for both. Or did you mean I should run this in your branch?

[justvanrossum]

Ok, after poking around, I see what you mean. Odd!

[typemytype]

a full example without using the caching DrawBot provides:

import AppKit
import CoreText

path = 'pathToFont.ttf'
# create font descriptors from data, so no url available
data = AppKit.NSData.dataWithContentsOfFile_(path)
descriptors = CoreText.CTFontManagerCreateFontDescriptorsFromData(data)

attributes = {
    CoreText.kCTFontURLAttribute: AppKit.NSURL.fileURLWithPath_(path)
}
# make a copy with adding attributes
descriptors = [CoreText.CTFontDescriptorCreateCopyWithAttributes(descriptor, attributes) for descriptor in descriptors]
# test attributes
url = CoreText.CTFontDescriptorCopyAttribute(descriptors[0], CoreText.kCTFontURLAttribute)
print(url)

# convert to CTFont
ctfont = CoreText.CTFontCreateWithFontDescriptor(descriptors[0], 10, None)

# convert back to a font descriptor
url = CoreText.CTFontDescriptorCopyAttribute(ctfont.fontDescriptor(), CoreText.kCTFontURLAttribute)
# url is gone
print(url)

[justvanrossum]

We're somehow ignoring fontNumber here.

Yet I don't know what to do, since CTFontManagerCreateFontDescriptorsFromData() does not (can not?) distinguish between "multiple instances in a VF", "multiple statics in a TTC" or even "multiple instances for multiple VFs in a TTC".