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M2: snap shrunk interpolated images to whole pixels so scans stay sharp (#1377)

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* M2: snap shrunk interpolated images to whole pixels so scans stay sharp

A scanned page (one 300 dpi image with /Interpolate true) was shrunk to a
ceil-sized raster and then sampled a second time at a fractional scale and
offset, which softened every edge next to Acrobat. An axis-aligned shrunk
interpolated image is now shrunk once to its rounded device rectangle and
drawn 1:1 at the rounded corner. Rotated, skewed, flipped, Type 3 and
non-interpolated images are unchanged.

On a synthetic scan page the mean error against an area-average reference
falls from 3.4 to 1.6 grey levels at 96 dpi (3.0 to 1.5 at 144 dpi).

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

* vendor: list the hayro snap patch as (14) in the Patches and Tests columns; correct gaps.md patch counts

The patch description had been appended to the Tests column of one of the
two hayro rows. gaps.md now counts the distinct patches vendor/README.md
lists (26 hayro-interpret, 15 hayro, 3 hayro-jbig2, 17 hayro-syntax).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

---------

Co-authored-by: Claude Sonnet 5.5 <[email protected]>
Co-authored-by: Brandon Thomas <[email protected]>
This commit is contained in:
philip-tamClaude Opus 5.5Brandon Thomas
 authored and GitHub committed 2026-10-12 07:12:02 -04:00
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commit 88d96c93a8
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+85 -9
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docs/gaps.md
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@@ -53,8 +53,8 @@ update the numbers.
- **Missing:** our own renderer (M2: `model` crate, font engine, DisplayList devices, ADR-0004), or
an owner decision to adopt another engine; and any measurement of rendering against Acrobat.
- **Evidence:** pages are drawn by vendored `hayro` 0.7 with 23 local patches to `hayro-interpret`,
10 to `hayro`, 3 to `hayro-jbig2` and 13 to `hayro-syntax` (`vendor/README.md`); `lopdf` still
- **Evidence:** pages are drawn by vendored `hayro` 0.7 with 26 local patches to `hayro-interpret`,
15 to `hayro`, 3 to `hayro-jbig2` and 17 to `hayro-syntax` (`vendor/README.md`); `lopdf` still
backs document inspection. All 7 rendering P0 features are `partial`. User reports: TikZ pattern
fills drawn wrong ([#794](https://github.com/storytold/pdfcraft/issues/794)), blurry text at
1080p/1440p ([#730](https://github.com/storytold/pdfcraft/issues/730)), fixed zoom sizes differ