74 lines
2.7 KiB
Swift
74 lines
2.7 KiB
Swift
import ClawdisKit
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import CoreGraphics
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import ImageIO
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import Testing
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import UniformTypeIdentifiers
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@Suite struct JPEGTranscoderTests {
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private func makeSolidJPEG(width: Int, height: Int, orientation: Int? = nil) throws -> Data {
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let cs = CGColorSpaceCreateDeviceRGB()
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let bitmapInfo = CGImageAlphaInfo.premultipliedLast.rawValue
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guard
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let ctx = CGContext(
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data: nil,
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width: width,
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height: height,
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bitsPerComponent: 8,
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bytesPerRow: 0,
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space: cs,
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bitmapInfo: bitmapInfo)
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else {
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throw NSError(domain: "JPEGTranscoderTests", code: 1)
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}
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ctx.setFillColor(red: 1, green: 0, blue: 0, alpha: 1)
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ctx.fill(CGRect(x: 0, y: 0, width: width, height: height))
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guard let img = ctx.makeImage() else {
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throw NSError(domain: "JPEGTranscoderTests", code: 5)
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}
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let out = NSMutableData()
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guard let dest = CGImageDestinationCreateWithData(out, UTType.jpeg.identifier as CFString, 1, nil) else {
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throw NSError(domain: "JPEGTranscoderTests", code: 2)
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}
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var props: [CFString: Any] = [
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kCGImageDestinationLossyCompressionQuality: 1.0,
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]
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if let orientation {
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props[kCGImagePropertyOrientation] = orientation
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}
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CGImageDestinationAddImage(dest, img, props as CFDictionary)
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guard CGImageDestinationFinalize(dest) else {
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throw NSError(domain: "JPEGTranscoderTests", code: 3)
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}
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return out as Data
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}
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@Test func downscalesToMaxWidthPx() throws {
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let input = try makeSolidJPEG(width: 2000, height: 1000)
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let out = try JPEGTranscoder.transcodeToJPEG(imageData: input, maxWidthPx: 1600, quality: 0.9)
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#expect(out.widthPx == 1600)
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#expect(abs(out.heightPx - 800) <= 1)
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#expect(out.data.count > 0)
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}
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@Test func doesNotUpscaleWhenSmallerThanMaxWidthPx() throws {
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let input = try makeSolidJPEG(width: 800, height: 600)
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let out = try JPEGTranscoder.transcodeToJPEG(imageData: input, maxWidthPx: 1600, quality: 0.9)
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#expect(out.widthPx == 800)
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#expect(out.heightPx == 600)
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}
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@Test func normalizesOrientationAndUsesOrientedWidthForMaxWidthPx() throws {
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// Encode a landscape image but mark it rotated 90° (orientation 6). Oriented width becomes 1000.
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let input = try makeSolidJPEG(width: 2000, height: 1000, orientation: 6)
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let out = try JPEGTranscoder.transcodeToJPEG(imageData: input, maxWidthPx: 1600, quality: 0.9)
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#expect(out.widthPx == 1000)
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#expect(out.heightPx == 2000)
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}
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}
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