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Scaled and region decode for every codec - #10

Merged

sdcb merged 20 commits into

mainfrom

scaled-decode

Nov 8, 2026

Merged

Scaled and region decode for every codec#10
sdcb merged 20 commits into
mainfrom
scaled-decode

Commits on Nov 8, 2026
- Every codec accepts every power-of-two ScaleDenominator: native, then a frozen box filter
  
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- Docs: every codec scales by any power of two (native, then the box filter)
  
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- Abstractions: remove Validate(width, height, bool) rather than obsolete it
  
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- Merge scaled-decode-l1: every codec accepts any power-of-two ScaleDenominator (native, then a frozen box downscale) (#6)
  
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- PNG: native region and scale decode for non-interlaced images
  
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  133e665
- BoxDownscaler: exact 32-bit emit for 8-bit RGB / RGBA boxes up to 2^16 pixels
  
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  2825469
- WebP: native region and scale decode for lossy stills
  
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  f52cc35
- WebP benchmarks and docs: region / scale contestants, recorded results
  
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- Merge scaled-webp: native streaming region and scale for WebP lossy stills (#7)
  
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- PNG benchmark: scaled / scaled-peakmem commands, recorded results
  
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- Docs: PNG native region and scale decode for non-interlaced images
  
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  36670d4
- HEIF: native scaled decode, each tile boxes the pixels it converts
  
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- HEIF benchmark: scaled contestants in quick and peakmem
  
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- PNG region tests: mutated and truncated image data fail cleanly
  
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- Merge scaled-png: native streaming region and scale for non-interlaced PNG (#8)
  
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- HEIF fuzz: a scaled decode in every case
  
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  6965548
- HEIF docs and benchmark record: native scaled decode, its alignment condition, time and peak memory
  
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- AOT / wasm smoke: a scaled HEIF TryDecodeInto into a padded destination
  
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  f94be37
- Merge scaled-heif: native scaled decode for HEIF, box-filtered per tile (#9)
  
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- known-gaps: native scale and on-demand region now cover PNG, WebP lossy and HEIF
  
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  bbf6c76

Commits

Commits on Nov 8, 2026