|
| 1 | +import CoreGraphics |
| 2 | +import Foundation |
| 3 | +import ImageIO |
| 4 | +import UniformTypeIdentifiers |
| 5 | + |
| 6 | +let arguments = CommandLine.arguments |
| 7 | + |
| 8 | +guard arguments.count == 3 else { |
| 9 | + fputs("Usage: render-icon.swift <glyph.png> <output.png>\n", stderr) |
| 10 | + exit(64) |
| 11 | +} |
| 12 | + |
| 13 | +let glyphURL = URL(fileURLWithPath: arguments[1]) |
| 14 | +let outputURL = URL(fileURLWithPath: arguments[2]) |
| 15 | + |
| 16 | +guard |
| 17 | + let glyphSource = CGImageSourceCreateWithURL(glyphURL as CFURL, nil), |
| 18 | + let glyph = CGImageSourceCreateImageAtIndex(glyphSource, 0, nil) |
| 19 | +else { |
| 20 | + fputs("Could not read icon glyph at \(glyphURL.path)\n", stderr) |
| 21 | + exit(66) |
| 22 | +} |
| 23 | + |
| 24 | +let size = 1024 |
| 25 | +let bounds = CGRect(x: 0, y: 0, width: size, height: size) |
| 26 | + |
| 27 | +guard |
| 28 | + let colorSpace = CGColorSpace(name: CGColorSpace.displayP3) ?? CGColorSpace(name: CGColorSpace.sRGB), |
| 29 | + let context = CGContext( |
| 30 | + data: nil, |
| 31 | + width: size, |
| 32 | + height: size, |
| 33 | + bitsPerComponent: 8, |
| 34 | + bytesPerRow: 0, |
| 35 | + space: colorSpace, |
| 36 | + bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue |
| 37 | + ) |
| 38 | +else { |
| 39 | + fputs("Could not create icon render context\n", stderr) |
| 40 | + exit(70) |
| 41 | +} |
| 42 | + |
| 43 | +context.clear(bounds) |
| 44 | + |
| 45 | +let cornerRadius: CGFloat = 224 |
| 46 | +let roundedRect = CGPath( |
| 47 | + roundedRect: bounds, |
| 48 | + cornerWidth: cornerRadius, |
| 49 | + cornerHeight: cornerRadius, |
| 50 | + transform: nil |
| 51 | +) |
| 52 | + |
| 53 | +context.saveGState() |
| 54 | +context.addPath(roundedRect) |
| 55 | +context.clip() |
| 56 | + |
| 57 | +let gradientColors = [ |
| 58 | + CGColor(red: 0.23193, green: 0.41350, blue: 0.80588, alpha: 1), |
| 59 | + CGColor(red: 0.38860, green: 0.77688, blue: 0.96841, alpha: 1), |
| 60 | +] as CFArray |
| 61 | + |
| 62 | +if let gradient = CGGradient(colorsSpace: colorSpace, colors: gradientColors, locations: [0, 1]) { |
| 63 | + context.drawLinearGradient( |
| 64 | + gradient, |
| 65 | + start: CGPoint(x: bounds.midX, y: bounds.minY), |
| 66 | + end: CGPoint(x: bounds.midX, y: bounds.maxY), |
| 67 | + options: [.drawsBeforeStartLocation, .drawsAfterEndLocation] |
| 68 | + ) |
| 69 | +} |
| 70 | + |
| 71 | +context.saveGState() |
| 72 | +context.setShadow( |
| 73 | + offset: CGSize(width: 0, height: -28), |
| 74 | + blur: 26, |
| 75 | + color: CGColor(gray: 0, alpha: 0.5) |
| 76 | +) |
| 77 | +context.setAlpha(0.88) |
| 78 | +context.draw(glyph, in: bounds) |
| 79 | +context.restoreGState() |
| 80 | + |
| 81 | +context.setFillColor(CGColor(red: 1, green: 1, blue: 1, alpha: 0.16)) |
| 82 | +context.addPath(roundedRect) |
| 83 | +context.fillPath() |
| 84 | + |
| 85 | +context.restoreGState() |
| 86 | + |
| 87 | +guard |
| 88 | + let image = context.makeImage(), |
| 89 | + let destination = CGImageDestinationCreateWithURL( |
| 90 | + outputURL as CFURL, |
| 91 | + UTType.png.identifier as CFString, |
| 92 | + 1, |
| 93 | + nil |
| 94 | + ) |
| 95 | +else { |
| 96 | + fputs("Could not create rendered icon PNG at \(outputURL.path)\n", stderr) |
| 97 | + exit(70) |
| 98 | +} |
| 99 | + |
| 100 | +CGImageDestinationAddImage(destination, image, nil) |
| 101 | + |
| 102 | +guard CGImageDestinationFinalize(destination) else { |
| 103 | + fputs("Could not write rendered icon to \(outputURL.path)\n", stderr) |
| 104 | + exit(73) |
| 105 | +} |
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