79 lines
2.6 KiB
Swift
79 lines
2.6 KiB
Swift
//
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// MTFont.swift
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// MathRenderSwift
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//
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// Created by Mike Griebling on 2022-12-31.
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//
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import Foundation
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import CoreGraphics
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import CoreText
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//
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// Font.swift
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// iosMath
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//
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// Created by Kostub Deshmukh on 5/18/16.
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//
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// This software may be modified and distributed under the terms of the
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// MIT license. See the LICENSE file for details.
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//
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public class MTFont {
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var defaultCGFont: CGFont!
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var ctFont: CTFont!
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var mathTable: MTFontMathTable?
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var rawMathTable: NSDictionary?
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init() {}
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convenience init(fontWithName name: String, size:CGFloat) {
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// CTFontCreateWithName does not load the complete math font, it only has about half the glyphs of the full math font.
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// In particular it does not have the math italic characters which breaks our variable rendering.
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// So we first load a CGFont from the file and then convert it to a CTFont.
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self.init()
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print("Loading font %@", name);
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let bundle = MTFont.fontBundle
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let fontPath = bundle.path(forResource: name, ofType: "otf")
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let fontDataProvider = CGDataProvider(filename: fontPath!)
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self.defaultCGFont = CGFont(fontDataProvider!)!
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print("Num glyphs: %zd", self.defaultCGFont.numberOfGlyphs)
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self.ctFont = CTFontCreateWithGraphicsFont(self.defaultCGFont, size, nil, nil);
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let mathTablePlist = bundle.url(forResource:name, withExtension:"plist")
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let dict = NSDictionary(contentsOf: mathTablePlist!) // dictionaryWithContentsOfFile:mathTablePlist];
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self.rawMathTable = dict
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self.mathTable = MTFontMathTable(withFont:self, mathTable:rawMathTable!)
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}
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static var fontBundle:Bundle {
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// Uses bundle for class so that this can be access by the unit tests.
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return Bundle(url: Bundle(for: self).url(forResource: "iosMathFonts", withExtension: "bundle")!)!
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}
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func copy(withSize size: CGFloat) -> MTFont {
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let newFont = MTFont()
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newFont.defaultCGFont = self.defaultCGFont
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newFont.ctFont = CTFontCreateWithGraphicsFont(self.defaultCGFont, size, nil, nil)
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newFont.rawMathTable = self.rawMathTable
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newFont.mathTable = MTFontMathTable(withFont: newFont, mathTable: newFont.rawMathTable!)
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return newFont
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}
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func get(nameForGlyph glyph:CGGlyph) -> String {
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let name = self.defaultCGFont.name(for: glyph)
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return name! as String
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}
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func get(glyphWithName name:String) -> CGGlyph {
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return self.defaultCGFont.getGlyphWithGlyphName(name: name as CFString)
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}
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var fontSize:CGFloat {
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return CTFontGetSize(self.ctFont)
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}
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}
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