97 lines
3.6 KiB
Swift
97 lines
3.6 KiB
Swift
// gen-icon.swift: generate a program icon for xM in the Apple icon format
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//
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// Copyright (c) 2023, Přemysl Eric Janouch <p@janouch.name>
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// SPDX-License-Identifier: 0BSD
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//
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// NSGraphicsContext mostly just weirdly wraps over Quartz,
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// so we do it all in Quartz directly.
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import CoreGraphics
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import Foundation
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import ImageIO
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import UniformTypeIdentifiers
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// Apple uses something that's close to a "quintic superellipse" in their icons,
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// but doesn't quite match. Either way, it looks better than rounded rectangles.
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func addSquircle(context: CGContext, bounds: CGRect) {
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context.move(to: CGPoint(x: bounds.maxX, y: bounds.midY))
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for theta in stride(from: 0.0, to: .pi * 2, by: .pi / 1e4) {
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let x = pow(abs(cos(theta)), 2 / 5.0) * bounds.width / 2
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* CGFloat(signOf: cos(theta), magnitudeOf: 1) + bounds.midX
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let y = pow(abs(sin(theta)), 2 / 5.0) * bounds.height / 2
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* CGFloat(signOf: sin(theta), magnitudeOf: 1) + bounds.midY
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context.addLine(to: CGPoint(x: x, y: y))
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}
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context.closePath()
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}
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func drawIcon(scale: CGFloat) -> CGImage? {
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let size = CGSizeMake(1024, 1024)
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let colorspace = CGColorSpaceCreateDeviceRGB()
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let context = CGContext(data: nil,
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width: Int(size.width * scale), height: Int(size.height * scale),
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bitsPerComponent: 8, bytesPerRow: 0, space: colorspace,
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bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue)!
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context.scaleBy(x: scale, y: scale)
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let bounds = CGRectMake(100, 100, size.width - 200, size.height - 200)
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addSquircle(context: context, bounds: bounds)
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let squircle = context.path!
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// Gradients don't draw shadows, so draw it separately.
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context.saveGState()
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context.setShadow(offset: CGSizeMake(0, -12).applying(context.ctm),
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blur: 28 * scale, color: CGColor(gray: 0, alpha: 0.5))
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context.setFillColor(CGColor(red: 1, green: 0x55p-8, blue: 0, alpha: 1))
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context.fillPath()
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context.restoreGState()
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context.saveGState()
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context.addPath(squircle)
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context.clip()
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context.drawLinearGradient(
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CGGradient(colorsSpace: colorspace, colors: [
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CGColor(red: 1, green: 0x00p-8, blue: 0, alpha: 1),
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CGColor(red: 1, green: 0xaap-8, blue: 0, alpha: 1)
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] as CFArray, locations: [0, 1])!,
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start: CGPointMake(0, 100), end: CGPointMake(0, size.height - 100),
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options: CGGradientDrawingOptions(rawValue: 0))
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context.restoreGState()
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context.move(to: CGPoint(x: size.width * 0.30, y: size.height * 0.30))
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context.addLine(to: CGPoint(x: size.width * 0.30, y: size.height * 0.70))
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context.addLine(to: CGPoint(x: size.width * 0.575, y: size.height * 0.425))
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context.move(to: CGPoint(x: size.width * 0.70, y: size.height * 0.30))
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context.addLine(to: CGPoint(x: size.width * 0.70, y: size.height * 0.70))
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context.addLine(to: CGPoint(x: size.width * 0.425, y: size.height * 0.425))
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context.setLineWidth(80)
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context.setLineCap(.round)
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context.setLineJoin(.round)
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context.setStrokeColor(CGColor.white)
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context.strokePath()
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return context.makeImage()
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}
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if CommandLine.arguments.count != 2 {
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print("Usage: \(CommandLine.arguments.first!) OUTPUT.icns")
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exit(EXIT_FAILURE)
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}
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let filename = CommandLine.arguments[1]
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let macOSSizes: Array<CGFloat> = [16, 32, 128, 256, 512]
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let icns = CGImageDestinationCreateWithURL(
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URL(fileURLWithPath: filename) as CFURL,
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UTType.icns.identifier as CFString, macOSSizes.count * 2, nil)!
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for size in macOSSizes {
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CGImageDestinationAddImage(icns, drawIcon(scale: size / 1024.0)!, nil)
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CGImageDestinationAddImage(icns, drawIcon(scale: size / 1024.0 * 2)!, [
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kCGImagePropertyDPIWidth: 144,
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kCGImagePropertyDPIHeight: 144,
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] as CFDictionary)
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}
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if !CGImageDestinationFinalize(icns) {
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print("ICNS finalization failed.")
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exit(EXIT_FAILURE)
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}
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