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44 lines
2.1 KiB
Markdown
44 lines
2.1 KiB
Markdown
# HDR Regression Suite
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HDR10 (BT.2020 PQ) regression suite with four back-to-back windows (A–D)
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covering the highest-value HDR compositing shapes. 10s / 300 frames at 30fps.
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## Windows
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| # | Window | Pipeline aspect under test |
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| - | ----------------------------------- | --------------------------------------------------------------------------------------------------------- |
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| A | Baseline HDR + direct opacity | HDR pass-through with a GSAP opacity tween directly on the `<video>` element. |
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| B | Z-order sandwich (DOM → HDR → DOM) | Orange background, HDR video in the middle, blue overlay on top. Tests z-ordered layer compositing. |
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| C | Transform + border-radius | HDR `<video>` with `transform: rotate() scale()` + `border-radius` clipping. Tests affine blit pipeline. |
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| D | Shader transition (HDR → HDR image) | Shader transition between an HDR video and an HDR PQ image. Tests HDR image transfer cache + shader path. |
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## Fixtures
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- `src/hdr-clip.mp4` — short HEVC Main10 / BT.2020 PQ clip with a moving
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bright gradient (see `NOTICE.md` for attribution). Reused across windows
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A–G and as scene A of the window-H shader transition.
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- `src/hdr-photo-pq.png` — 256×144 16-bit RGB PNG with a hand-injected `cICP`
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chunk (primaries=BT.2020, transfer=SMPTE ST 2084, matrix=GBR, range=full).
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Used as scene B of the window-H shader transition.
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ffmpeg is **not** used to generate the PNG because it does not embed `cICP`
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in PNGs — without that chunk Chromium would not treat the file as HDR and the
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test would silently fall back to SDR.
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To regenerate the PNG fixture (deterministic, byte-for-byte stable):
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```bash
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python3 packages/producer/tests/hdr-regression/scripts/generate-hdr-photo-pq.py
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```
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## Running
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```bash
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cd packages/producer
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bun run test:regression hdr-regression
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bun run test:regression:update hdr-regression
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```
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In CI it runs in the `hdr` shard alongside `hdr-hlg-regression`
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(see `.github/workflows/regression.yml`).
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