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Add opt-in incremental bounded HEIC decoding - #2
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laurens-pilot wants to merge 3 commits into
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laurens-pilot wants to merge 3 commits into
laurens-pilot wants to merge 3 commits into
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Superseded by ente#12. |
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Add feature-gated incremental reconstruction for supported opaque 8-bit 4:2:0 HEVC still images, including non-grid images and grids with oversized tiles. Complete prediction and filtering in rolling bands before conversion and downsampling, so source raster storage grows with width rather than total pixels. Existing APIs and production callers retain their behavior.
A 199.8 MP photograph re-encoded as a single HEIC item produces 6000×4500 output with 103.3 MiB measured peak heap under a 128 MiB budget; all 299,635,200 reconstructed YUV samples match FFmpeg. This is host evidence for the supported subset, not native camera compatibility or a universal RSS guarantee. WPP, alpha, higher bit depths and other coding structures remain follow-up work.
Include allocation ceilings and portable reference checks that keep native samples exact while allowing at most one RGB8 code value for display rounding. A pinned fixture explicitly records the libheif chroma-border defect; the existing exact normal-decoder comparison policy stays intact.