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4fc4790 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | import OpenClawKit
import CoreGraphics
import ImageIO
import Testing
import UniformTypeIdentifiers
@Suite struct JPEGTranscoderTests {
private func makeSolidJPEG(width: Int, height: Int, orientation: Int? = nil) throws -> Data {
let cs = CGColorSpaceCreateDeviceRGB()
let bitmapInfo = CGImageAlphaInfo.premultipliedLast.rawValue
guard
let ctx = CGContext(
data: nil,
width: width,
height: height,
bitsPerComponent: 8,
bytesPerRow: 0,
space: cs,
bitmapInfo: bitmapInfo)
else {
throw NSError(domain: "JPEGTranscoderTests", code: 1)
}
ctx.setFillColor(red: 1, green: 0, blue: 0, alpha: 1)
ctx.fill(CGRect(x: 0, y: 0, width: width, height: height))
guard let img = ctx.makeImage() else {
throw NSError(domain: "JPEGTranscoderTests", code: 5)
}
let out = NSMutableData()
guard let dest = CGImageDestinationCreateWithData(out, UTType.jpeg.identifier as CFString, 1, nil) else {
throw NSError(domain: "JPEGTranscoderTests", code: 2)
}
var props: [CFString: Any] = [
kCGImageDestinationLossyCompressionQuality: 1.0,
]
if let orientation {
props[kCGImagePropertyOrientation] = orientation
}
CGImageDestinationAddImage(dest, img, props as CFDictionary)
guard CGImageDestinationFinalize(dest) else {
throw NSError(domain: "JPEGTranscoderTests", code: 3)
}
return out as Data
}
private func makeNoiseJPEG(width: Int, height: Int) throws -> Data {
let bytesPerPixel = 4
let byteCount = width * height * bytesPerPixel
var data = Data(count: byteCount)
let cs = CGColorSpaceCreateDeviceRGB()
let bitmapInfo = CGImageAlphaInfo.premultipliedLast.rawValue
let out = try data.withUnsafeMutableBytes { rawBuffer -> Data in
guard let base = rawBuffer.baseAddress?.assumingMemoryBound(to: UInt8.self) else {
throw NSError(domain: "JPEGTranscoderTests", code: 6)
}
for idx in 0..<byteCount {
base[idx] = UInt8.random(in: 0...255)
}
guard
let ctx = CGContext(
data: base,
width: width,
height: height,
bitsPerComponent: 8,
bytesPerRow: width * bytesPerPixel,
space: cs,
bitmapInfo: bitmapInfo)
else {
throw NSError(domain: "JPEGTranscoderTests", code: 7)
}
guard let img = ctx.makeImage() else {
throw NSError(domain: "JPEGTranscoderTests", code: 8)
}
let encoded = NSMutableData()
guard let dest = CGImageDestinationCreateWithData(encoded, UTType.jpeg.identifier as CFString, 1, nil)
else {
throw NSError(domain: "JPEGTranscoderTests", code: 9)
}
CGImageDestinationAddImage(dest, img, nil)
guard CGImageDestinationFinalize(dest) else {
throw NSError(domain: "JPEGTranscoderTests", code: 10)
}
return encoded as Data
}
return out
}
@Test func downscalesToMaxWidthPx() throws {
let input = try makeSolidJPEG(width: 2000, height: 1000)
let out = try JPEGTranscoder.transcodeToJPEG(imageData: input, maxWidthPx: 1600, quality: 0.9)
#expect(out.widthPx == 1600)
#expect(abs(out.heightPx - 800) <= 1)
#expect(out.data.count > 0)
}
@Test func doesNotUpscaleWhenSmallerThanMaxWidthPx() throws {
let input = try makeSolidJPEG(width: 800, height: 600)
let out = try JPEGTranscoder.transcodeToJPEG(imageData: input, maxWidthPx: 1600, quality: 0.9)
#expect(out.widthPx == 800)
#expect(out.heightPx == 600)
}
@Test func normalizesOrientationAndUsesOrientedWidthForMaxWidthPx() throws {
// Encode a landscape image but mark it rotated 90° (orientation 6). Oriented width becomes 1000.
let input = try makeSolidJPEG(width: 2000, height: 1000, orientation: 6)
let out = try JPEGTranscoder.transcodeToJPEG(imageData: input, maxWidthPx: 1600, quality: 0.9)
#expect(out.widthPx == 1000)
#expect(out.heightPx == 2000)
}
@Test func respectsMaxBytes() throws {
let input = try makeNoiseJPEG(width: 1600, height: 1200)
let out = try JPEGTranscoder.transcodeToJPEG(
imageData: input,
maxWidthPx: 1600,
quality: 0.95,
maxBytes: 180_000)
#expect(out.data.count <= 180_000)
}
}
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