iOSでSVG画像を扱う

Transcript

1. J04Ͱ47(ը૾Λѻ͏
2. let path = "/System/Library/PrivateFrameworks/CoreSVG.framework/CoreSVG" guard let h = dlopen(path, RTLD_NOW) else { fatalError(String(cString: dlerror())) } J04Ͱ47(ը૾Λѻ͏ ϑϨʔϜϫʔΫΛಈతʹಡΈࠐΉ
3. @objc class CGSVGDocument: NSObject {} typealias CreateFn = @convention(c) (CFData?, CFDictionary?) -> Unmanaged<CGSVGDocument>? guard let p = dlsym(h, "CGSVGDocumentCreateFromData") else { fatalError(String(cString: dlerror())) } let CGSVGDocumentCreateFromData = unsafeBitCast(p, to: CreateFn.self) J04Ͱ47(ը૾Λѻ͏ ؔ਺ͷγϯϘϧΛऔಘ͢Δ
4. let document = CGSVGDocumentCreateFromData(data as CFData, nil)?.takeUnretainedValue() guard let document else { return } J04Ͱ47(ը૾Λѻ͏
5. let sel = NSSelectorFromString("_imageWithCGSVGDocument:") typealias IMPFn = @convention(c) (AnyObject, Selector, CGSVGDocument) -> UIImage if let imp = (UIImage.self as AnyObject).method(for: sel) { let makeImage = unsafeBitCast(imp, to: IMPFn.self) let image = makeImage(UIImage.self, sel, document) ... } J04Ͱ47(ը૾Λѻ͏
6. typealias DrawFn = @convention(c) (CGContext?, CGSVGDocument?) -> Void guard let p = dlsym(h, "CGContextDrawSVGDocument") else { fatalError(String(cString: dlerror())) } let CGContextDrawSVGDocument = unsafeBitCast(p, to: DrawFn.self) let size = CGSize(width: 191.19, height: 59.39) let render = UIGraphicsImageRenderer(size: size) let uiImage = render.image { (context) in let cgContext = context.cgContext cgContext.translateBy(x: 0, y: size.height) cgContext.scaleBy(x: 1, y: -1) CGContextDrawSVGDocument(cgContext, document) } J04Ͱ47(ը૾Λѻ͏
7. J04Ͱ47(ը૾Λѻ͏ let path = URL(fileURLWithPath: "/System/Library/PrivateFrameworks/CoreSVG.framework") guard let cf = CFBundleCreate(kCFAllocatorDefault, path as CFURL) else { return } guard CFBundleLoadExecutable(cf) else { return } EMPQFOEMTZN
   
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8. J04Ͱ47(ը૾Λѻ͏ @objc class CGSVGDocument: NSObject {} typealias CreateFn = @convention(c) (CFData?, CFDictionary?) -> Unmanaged<CGSVGDocument>? let p = CFBundleGetFunctionPointerForName(cf, "CGSVGDocumentCreateFromData" as CFString) guard let p else { return } let CGSVGDocumentCreateFromData: CreateFn = unsafeBitCast(p, to: CreateFn.self) EMPQFOEMTZN
   
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9. J04Ͱ47(ը૾Λѻ͏ EMPQFOEMTZN
   
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   "1* typealias DrawFn = @convention(c) (CGContext?, CGSVGDocument?) -> Void guard let p = dlsym( h, "CGContextDrawSVGDocument" ) else { fatalError(String(cString: dlerror())) } let CGContextDrawSVGDocument = unsafeBitCast(p, to: DrawFn.self)