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September 28, 2021 06:43
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Making CGlyph of an extended grapheme cluster.
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// CTFontGetGlyphsForCharacters(_:_:_:_:) | |
// [UniChar] β [CGGlyph] | |
import Foundation | |
func makeUnichars(from str: NSString) -> [UInt16] { | |
let range = NSRange(location:0, length: str.length) | |
let encoding = String.Encoding.utf16.rawValue | |
let maxLength = str.maximumLengthOfBytes(using: encoding) | |
let rawPointer = UnsafeMutableRawPointer.allocate(byteCount: maxLength, alignment: 0) | |
var usedLength: Int = 0 | |
str.getBytes(rawPointer, | |
maxLength: maxLength, | |
usedLength: &usedLength, | |
encoding: encoding, | |
range: range, | |
remaining: nil) | |
let rawBufferPointer = UnsafeRawBufferPointer(start: rawPointer, count: usedLength) | |
let bufferPointer = rawBufferPointer.bindMemory(to: UInt16.self) | |
return Array(bufferPointer) | |
} | |
// EXAMPLE | |
let str: NSString = "\u{0001F469}\u{200D}\u{0001F469}\u{200D}\u{0001F467}\u{200D}\u{0001F466}" | |
print("Inputed: \(str)") | |
let unichars = makeUnichars(from: str) | |
var font = CTFontCreateWithName("AppleColorEmoji" as CFString, 17.0, nil) | |
font = CTFontCreateForString(font, str, CFRange(location: 0, length: str.length)) | |
let fontName = CTFontCopyDisplayName(font) | |
print("font = \(fontName)") | |
var glyphs: [CGGlyph] = Array(repeating: 0, count: str.length) | |
if (CTFontGetGlyphsForCharacters(font, unichars, &glyphs, str.length)) { | |
print("succeed in generating glyph") | |
print("glyphs = \(glyphs)") | |
} else { | |
print("failed in generating glyph") | |
} | |
/* output | |
Inputed: π©βπ©βπ§βπ¦ | |
font = Apple Color Emoji | |
succeed in generating glyph | |
glyphs = [1164, 0, 43, 1164, 0, 43, 1056, 0, 43, 1050, 0] | |
*/ |
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// CTFrameSetter β CTFrame β [CTLine] β [CTRun] β [CGGlyph] | |
import Foundation | |
func makeRuns(from str: String) -> [CTRun] { | |
let attStr = NSAttributedString(string: str) | |
let range = CFRange(location: 0, length: attStr.length) | |
let size = CGSize(width: 100, height: 100) | |
let path = CGPath(rect: CGRect(origin: .zero, size: size), transform: nil) | |
let framesetter = CTFramesetterCreateWithAttributedString(attStr) | |
let frame = CTFramesetterCreateFrame(framesetter, range, path, nil) | |
let lines = CTFrameGetLines(frame) as! [CTLine] | |
return lines.flatMap { | |
return CTLineGetGlyphRuns($0) as! [CTRun] | |
} | |
} | |
func makeGlyphs(from run: CTRun) -> [CGGlyph] { | |
let glyphsCount = CTRunGetGlyphCount(run) | |
let range = CFRange(location: 0, length: glyphsCount) | |
var glyphs: [CGGlyph] = Array(repeating: 0, count: glyphsCount) | |
CTRunGetGlyphs(run, range, &glyphs) | |
return glyphs | |
} | |
// EXAMPLE | |
// π©βπ©βπ§βπ¦ | |
let str = "\u{0001F469}\u{200D}\u{0001F469}\u{200D}\u{0001F467}\u{200D}\u{0001F466}" | |
print("Inputed: \(str)") | |
let run = makeRuns(from: str)[0] | |
let attributes = CTRunGetAttributes(run) as! [String :Any] | |
let font = attributes["NSFont"] as! CTFont | |
let fontName = CTFontCopyDisplayName(font) | |
print("font = \(fontName)") | |
let glyphs = makeGlyphs(from: run) | |
print(glyphs) // [1289] |
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