Project content:
- Oriented image generator
- Load and orient CGImage and CIImage
- Orient CGRect based on image orientation
- Crop CGImage, CIImage and vImage
- Benchmarks
Code located in Tests.
Those images looks the same when correctly displayed, but under the hood they pretty different.
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try OrientedGenerator.generateFrom(
source: sourceImageFile,
destination: destinationDirectory,
format: .jpeg,
size: CGSize(width: 1280, height: 1280),
quality: 0.75
)One call equals to loading 8 images, crop them and write image data to file. Full execution is 10 single calls - 80 images in summary.
| Method | Full Execution Time (seconds) | Average Execution Time per call (seconds) | Average CPU Time (seconds) | Memory Usage (kB) | Memory Peak Physical (MB) | Disk Writes (MB) | CPU Usage (% relative to CGImage) |
|---|---|---|---|---|---|---|---|
| CGImage | 38.719 | 6.372 | 5.365 | 101.6 | 11.6 | 9.0 | 100% |
| CIImage | 14.432 | 2.352 | 1.344 | 62.3 | 15.0 | 10.9 | 29.3% |
| vImage (CG)* | 31.458 | 5.186 | 5.162 | 55.7 | 11.7 | 9.0 | 23.8% |
| vImage (CI)* | 30.431 | 4.933 | 4.445 | - | 15.4 | 11.0 | 28.8% |
* vImage doesn't have API to load and save image files, so the CGImage and CIImage was used for it.