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+// gen-icon.awk: generate a program icon for xM in the Apple icon format
+//
+// Copyright (c) 2023, Přemysl Eric Janouch <p@janouch.name>
+// SPDX-License-Identifier: 0BSD
+//
+// NSGraphicsContext mostly just weirdly wraps over Quartz,
+// so we do it all in Quartz directly.
+import CoreGraphics
+import Foundation
+import ImageIO
+import UniformTypeIdentifiers
+
+// XXX: Not even AppKit provides real superelliptic squircles; screw it.
+func drawSquircle(context: CGContext, bounds: CGRect, radius: CGFloat) {
+ context.move(to: CGPointMake(bounds.minX, bounds.maxY - radius))
+ context.addArc(
+ center: CGPointMake(bounds.minX + radius, bounds.maxY - radius),
+ radius: radius, startAngle: .pi, endAngle: .pi / 2, clockwise: true)
+ context.addLine(to: CGPointMake(bounds.maxX - radius, bounds.maxY))
+ context.addArc(
+ center: CGPointMake(bounds.maxX - radius, bounds.maxY - radius),
+ radius: radius, startAngle: .pi / 2, endAngle: 0, clockwise: true)
+ context.addLine(to: CGPointMake(bounds.maxX, bounds.maxY - radius))
+ context.addArc(
+ center: CGPointMake(bounds.maxX - radius, bounds.minY + radius),
+ radius: radius, startAngle: 0, endAngle: .pi / -2, clockwise: true)
+ context.addLine(to: CGPointMake(bounds.minX + radius, bounds.minY))
+ context.addArc(
+ center: CGPointMake(bounds.minX + radius, bounds.minY + radius),
+ radius: radius, startAngle: .pi / -2, endAngle: .pi, clockwise: true)
+ context.closePath()
+}
+
+func drawIcon(scale: CGFloat) -> CGImage? {
+ let size = CGSizeMake(1024, 1024)
+
+ let colorspace = CGColorSpaceCreateDeviceRGB()
+ let context = CGContext(data: nil,
+ width: Int(size.width * scale), height: Int(size.height * scale),
+ bitsPerComponent: 8, bytesPerRow: 0, space: colorspace,
+ bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue)!
+ context.scaleBy(x: scale, y: scale)
+
+ let bounds = CGRectMake(100, 100, size.width - 200, size.height - 200)
+ // The radius was something like size.{width,height}/6.4, at least for iOS.
+ drawSquircle(context: context, bounds: bounds, radius: 180)
+ let squircle = context.path!
+
+ // Gradients don't draw shadows, so draw it separately.
+ context.saveGState()
+ context.setShadow(offset: CGSizeMake(0, -12).applying(context.ctm),
+ blur: 28 * scale, color: CGColor(gray: 0, alpha: 0.5))
+ context.setFillColor(CGColor(red: 1, green: 0x55p-8, blue: 0, alpha: 1))
+ context.fillPath()
+ context.restoreGState()
+
+ context.saveGState()
+ context.addPath(squircle)
+ context.clip()
+ context.drawLinearGradient(
+ CGGradient(colorsSpace: colorspace, colors: [
+ CGColor(red: 1, green: 0x00p-8, blue: 0, alpha: 1),
+ CGColor(red: 1, green: 0xaap-8, blue: 0, alpha: 1)
+ ] as CFArray, locations: [0, 1])!,
+ start: CGPointMake(0, 100), end: CGPointMake(0, size.height - 100),
+ options: CGGradientDrawingOptions(rawValue: 0))
+ context.restoreGState()
+
+ context.move(to: CGPoint(x: size.width * 0.30, y: size.height * 0.30))
+ context.addLine(to: CGPoint(x: size.width * 0.30, y: size.height * 0.70))
+ context.addLine(to: CGPoint(x: size.width * 0.575, y: size.height * 0.425))
+ context.move(to: CGPoint(x: size.width * 0.70, y: size.height * 0.30))
+ context.addLine(to: CGPoint(x: size.width * 0.70, y: size.height * 0.70))
+ context.addLine(to: CGPoint(x: size.width * 0.425, y: size.height * 0.425))
+ context.setLineWidth(80)
+ context.setLineCap(.round)
+ context.setLineJoin(.round)
+ context.setStrokeColor(CGColor.white)
+ context.strokePath()
+ return context.makeImage()
+}
+
+if CommandLine.arguments.count != 2 {
+ print("Usage: \(CommandLine.arguments.first!) OUTPUT.icns")
+ exit(EXIT_FAILURE)
+}
+
+let filename = CommandLine.arguments[1]
+
+let macOSSizes: Array<CGFloat> = [16, 32, 128, 256, 512]
+let icns = CGImageDestinationCreateWithURL(
+ URL(fileURLWithPath: filename) as CFURL,
+ UTType.icns.identifier as CFString, macOSSizes.count * 2, nil)!
+for size in macOSSizes {
+ CGImageDestinationAddImage(icns, drawIcon(scale: size / 1024.0)!, nil)
+ CGImageDestinationAddImage(icns, drawIcon(scale: size / 1024.0 * 2)!, [
+ kCGImagePropertyDPIWidth: 144,
+ kCGImagePropertyDPIHeight: 144,
+ ] as CFDictionary)
+}
+if !CGImageDestinationFinalize(icns) {
+ print("ICNS finalization failed.")
+ exit(EXIT_FAILURE)
+}