Add ImageLayer

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: Adds a new QuartzCore-backed ImageLayer for rendering GraphicsImage content via CALayer, including resizing/tinting and HDR/EDR configuration.

Changes:

• Introduce ImageLayer (Darwin-only) to map GraphicsImage.Contents into layer contents/backgroundColor and configure edge antialiasing and interpolation.
• Implement GraphicsImage helpers to compute contentsCenter and tiling vs stretching (layerStretchInPixels, contentStretchInPixels, isTiledWhenStretchedToSize).
• Add template-image handling using private CoreAnimation SPI (contentsSwizzle + contentsMultiplyColor) via a new helper _CALayerSetSplatsContentsAlpha.
• Expose additional private CALayer SPI in shims (contentsScaling, EDR properties, swizzle/scaling/filter constants).
• Configure extended dynamic range rendering by setting wantsExtendedDynamicRangeContent and animating contentsMaximumDesiredEDR transitions.
• Refactor GraphicsImage.size to reuse the existing pixelSize computed property.
• Add unit tests for the new stretch/tile rectangle calculations.

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[augmentcode]

Review completed. 3 suggestions posted.

Comment augment review to trigger a new review at any time.

[augmentcode]

update(image:size:) returns early when contents is nil, but that leaves prior image-related state (e.g. contentsMultiplyColor, contentsScaling, filters, EDR flags) untouched and potentially leaking across updates (e.g. when switching to .color). Consider explicitly resetting any stateful content-related properties before returning so the layer can’t carry stale configuration forward.

Severity: medium

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[augmentcode]

When headroom drops back to .standard, wantsExtendedDynamicRangeContent is never set back to false, so a layer that previously displayed HDR content may remain in EDR mode. That can make subsequent SDR (or background-color-only) updates behave differently than intended.

Severity: medium

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[augmentcode]

The new stretch/tile math depends on scale and orientation (via bitmapOrientation), but the current argument sets mostly exercise .up and scale 1. Adding at least one non-.up orientation case and a non-1.0 scale case would help catch regressions in the normalization logic.

Severity: low

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[codecov]

Codecov Report

❌ Patch coverage is 44.24242% with 92 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.75%. Comparing base (0c0d938) to head (70bd57f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ources/OpenSwiftUICore/View/Image/ImageLayer.swift	43.90%	92 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #763       +/-   ##
===========================================
+ Coverage   13.43%   26.75%   +13.32%     
===========================================
  Files         617      647       +30     
  Lines       35960    39386     +3426     
===========================================
+ Hits         4832    10539     +5707     
+ Misses      31128    28847     -2281     

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