init dump

Sources/JolkEngine/Loaders/NSImageLoader.swift

@@ -0,0 +1,50 @@
+import AppKit
+
+
+enum ImageLoaderError: Error
+{
+	case loadFailed(_ message: String)
+}
+
+struct NSImageLoader: LoaderProtocol
+{
+	typealias T = Image
+
+	func load(url: URL) -> T?
+	{
+		guard let image = try? NSImageLoader.loadImage(url: url) else { return nil }
+		return image
+	}
+
+	static func loadImage(url: URL) throws -> Image
+	{
+		try autoreleasepool
+		{
+			// Open as a Core Graphics image
+			guard let nsImg = NSImage(contentsOf: url),
+				let image = nsImg.cgImage(forProposedRect: nil, context: nil, hints: nil)
+			else { throw ImageLoaderError.loadFailed("Failed to open image \"\(url.absoluteString)\"") }
+
+			// Convert to 8-bit ARGB (SRGB) w/ premultiplied alpha
+			let alphaInfo = image.alphaInfo == .none ? CGImageAlphaInfo.noneSkipLast : CGImageAlphaInfo.premultipliedLast
+			guard let colourspace = CGColorSpace(name: CGColorSpace.sRGB),
+				let context = CGContext(data: nil,
+				width: image.width,
+				height: image.height,
+				bitsPerComponent: 8,
+				bytesPerRow: image.width * 4,
+				space: colourspace,
+				bitmapInfo: alphaInfo.rawValue | CGBitmapInfo.byteOrder32Big.rawValue)
+			else { throw ImageLoaderError.loadFailed("Coudn't create graphics context") }
+			let flipVertical = CGAffineTransform(a: 1, b: 0, c: 0, d: -1, tx: 0, ty: CGFloat(image.height))
+			context.concatenate(flipVertical)
+			context.draw(image, in: CGRect(x: 0, y: 0, width: image.width, height: image.height))
+
+			guard let data = context.data else { throw ImageLoaderError.loadFailed("what") }
+			return Image(
+				pixels: Data(bytes: data, count: 4 * image.width * image.height),
+				width: image.width,
+				height: image.height)
+		}
+	}
+}