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threadsafe MathFont, MTFontV2, MTFontMathTableV2 with concurrent testScripts.

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This commit is contained in:
Peter Tang
2023-09-18 13:30:31 +08:00
parent be802ae0c6
commit 5de5ea677e
6 changed files with 293 additions and 69 deletions
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31
Sources/SwiftMath/MathBundle/MTFontV2.swift
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@@ -1,6 +1,6 @@
//
// MTFontV2.swift
//
//
//
// Created by Peter Tang on 15/9/2023.
//
@@ -17,17 +17,18 @@ extension MathFont {
public final class MTFontV2: MTFont {
let font: MathFont
let size: CGFloat
private lazy var _cgFont: CGFont = {
font.cgFont()
}()
private lazy var _ctFont: CTFont = {
font.ctFont(withSize: size)
}()
private lazy var _mathTab = MTFontMathTableV2(mathFont: font, size: size)
private let _cgFont: CGFont
private let _ctFont: CTFont
private let unitsPerEm: UInt
private var _mathTab: MTFontMathTableV2?
init(font: MathFont = .latinModernFont, size: CGFloat) {
self.font = font
self.size = size
// MathFont cgfont and ctfont are fast & threadsafe, keep a local copy is cheaper than
// handling via NSLock
self._cgFont = font.cgFont()
self._ctFont = font.ctFont(withSize: size)
self.unitsPerEm = self._ctFont.unitsPerEm
super.init()
super.defaultCGFont = nil
@@ -43,9 +44,19 @@ public final class MTFontV2: MTFont {
set { fatalError("\(#function): change to \(font.fontName) not allowed.") }
get { _ctFont }
}
private let mtfontV2LockOnMathTable = NSLock()
override var mathTable: MTFontMathTable? {
set { fatalError("\(#function): change to \(font.rawValue) not allowed.") }
get { _mathTab }
get {
guard _mathTab == nil else { return _mathTab }
//Note: lazy _mathTab initialization is now threadsafe.
mtfontV2LockOnMathTable.lock()
defer { mtfontV2LockOnMathTable.unlock() }
if _mathTab == nil {
_mathTab = MTFontMathTableV2(mathFont: font, size: size, unitsPerEm: unitsPerEm)
}
return _mathTab
}
}
override var rawMathTable: NSDictionary? {
set { fatalError("\(#function): change to \(font.rawValue) not allowed.") }