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pdfcraft/vendor/vello_cpu/CHANGELOG.md
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KenM76andClaude Opus 5.5 05630b5f15 fix(render): a gray drawn with the Color blend mode is no longer drawn black 
vello_cpu 0.0.8's clip_color, shared by the nonseparable blend modes,
divided 0 by 0 when a gray's equal components were rounded just below 0
or above 1 after set_lum. The NaN drew the pixel black at the source's
alpha whatever the backdrop: nine gray levels under /BM /Color in an
empty isolated group (0.96 g among them) rendered (0, 0, 0), and two
more at half opacity came out wrong.

Vendor vello_cpu 0.0.8 (Apache-2.0 OR MIT) with a backport of
linebender/vello#2000, which clips only when the denominator is
positive. No vello_cpu release carries the fix yet; drop the copy when
one does.

Tests in it::nonseparable_gray run every gray level. The two Color
ramps fail with the unpatched blend.rs. The Luminosity ramp (black over
each opaque gray, upstream's other case) passes either way here: pages
use the u8 pipeline, and that case only failed in the f32 one; it stays
as a guard.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SqmHYx8FiWM5PcsoiErgp9
2026-10-28 14:45:32 -04:00

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<!-- Instructions
This changelog follows the patterns described here: <https://keepachangelog.com/en/>.
Subheadings to categorize changes are `added, changed, deprecated, removed, fixed, security`.
-->
# Changelog
## [Unreleased]
This release has an [MSRV][] of 1.88.
## [0.0.8][] - 2026-05-15
This release has an [MSRV][] of 1.88.
### Added
- `render_decoration` on glyph run builders for rendering text decorations with skip-ink behavior. ([#1592][] by [@taj-p][])
- Support for rendering VARC glyphs in text paths. ([#1594][] by [@nicoburns][], [@oscargus][])
- Support for synthetic font emboldening in text glyph runs via `GlyphRunBuilder::font_embolden` and `glifo::FontEmbolden`. ([#1628][] by [@jrmoulton][])
### Changed
- Migrated text rendering to `glifo`; rendering, glyph, and image APIs now use an explicit `Resources` object for persistent image and glyph caches. `RenderContext::render_to_buffer`, `RenderContext::render_to_pixmap`, `RenderContext::composite_to_pixmap_at_offset`, and `RenderContext::glyph_run` now take resources, and image registration moved from `RenderContext` to `Resources`. ([#1562][] by [@LaurenzV][])
- Renamed image transparency hint APIs from `may_have_opacities` and `*_opacity_hint` to `may_have_transparency` and `*_transparency_hint`. ([#1613][] by [@upsuper][])
### Removed
- Experimental `vello_api` integration and `api` module. ([#1602][] by [@waywardmonkeys][])
- Support for recordings.
This decision was made due to a number of downsides that came with the implementation.
See the corresponding PR and Zulip thread for more information. ([#1611][] by [@LaurenzV][])
### Fixed
- Rendering of rare degenerate radial gradients with undefined regions, which should render those regions transparent. ([#1529][] by [@LaurenzV][])
- Incorrect rendering of filter layers containing nested clip layers. ([#1541][] by [@LaurenzV][])
- x86 artifacts in bicubic image rendering caused by negative interpolated color values wrapping during SIMD `f32` to `u8` conversion. ([#1563][] by [@LaurenzV][])
- Stroked glyph rendering when scaled glyph runs absorb the transform into the font size, preserving the expected stroke width. ([#1576][] by [@LaurenzV][])
- COLR glyph rendering, including glyphs using non-default blend modes. ([#1584][] by [@LaurenzV][])
- Rendering of inverted rectangles, including blurred rounded rectangles. ([#1589][] by [@LaurenzV][])
### Optimized
- CPU fine rasterization performance through improved SIMD codegen. ([#1616][] by [@LaurenzV][])
## [0.0.7][] - 2026-03-24
This release has an [MSRV][] of 1.92.
### Added
- `composite_to_pixmap_at_offset` method to `RenderContext` for compositing at specific offsets within a larger pixmap. ([#1416][] by [@grebmeg][])
- `ImageResolver` for resolving opaque image IDs at rasterization time. ([#1451][] by [@grebmeg][])
- Support for image tinting. ([#1460][] by [@grebmeg][])
### Fixed
- Rendering of blurred rounded rectangles with zero or very small blur standard deviations. ([#1422][] by [@tomcur][])
- Off-by-one error in gaussian blur decimation filter. ([#1488][] by [@LaurenzV][])
- Filter layers with zero clips. ([#1437][] by [@LaurenzV][])
### Optimized
- Bilinear image sampling in the `RenderMode::OptimizeQuality` (`f32`) pipeline. ([#1343][] by [@tomcur][])
## [0.0.6][] - 2026-01-15
This release has an [MSRV][] of 1.88.
### Added
- Support for the "offset" filter. ([#1351] by [@waywardmonkeys])
### Changed
- Breaking change: Updated Peniko to [v0.6.0](https://github.com/linebender/peniko/releases/tag/v0.6.0). ([#1349][] by [@DJMcNab][])
- This also updates Kurbo to [v0.13.0](https://github.com/linebender/kurbo/releases/tag/v0.13.0).
- Upgraded Skrifa to v0.40.0. ([#1353][] by [@waywardmonkeys][])
- Upgraded Hashbrown to v0.16.1. ([#1354][] by [@waywardmonkeys][])
- Optimized image rendering for axis-aligned images. ([#1335][] by [@grebmeg][])
See also the [vello_hybrid 0.0.6](../vello_hybrid/CHANGELOG.md#006---2026-01-15) and [vello_common 0.0.6](../vello_common/CHANGELOG.md#006---2026-01-15) releases.
## [0.0.5][] - 2026-01-08
This release has an [MSRV][] of 1.88.
### Added
- The `RenderContext` now has a `set_blend_mode` (and a corresponding `blend_mode` getter method) that can be used to support non-isolated blending. ([#1159][] by [@LaurenzV])
- The `RenderContext` now contains a `push_clip_path` and `pop_clip_path` method for performing non-isolated clipping. ([#1203][] by [@LaurenzV])
- Experimental support for image filter effects: ([#1286][] by [@grebmeg][])
- New filter API methods on `RenderContext`:
- `set_filter_effect()` - Set a filter to be applied to subsequent drawing operations.
- `push_filter_layer()` - Create a new layer with a filter effect.
- `FilterEffect` trait providing both u8 and f32 precision variants for rendering across different backends.
- Gaussian Blur filter with configurable standard deviation and edge modes (`None`, `Mirror`, `Wrap`, `Duplicate`).
Uses an optimized decimated blur algorithm with automatic downsampling for performance.
- Drop Shadow filter with customizable offset, blur radius, and shadow color.
- Flood filter for solid color fills.
- A `set_mask` method to make it possible to mask rendered paths without inducing layer isolation. ([#1237][] by [@LaurenzV])
- Support for conditionally disabling the u8 or f32 pipeline. ([#1294][] by [@nicoburns])
### Changed
- Improved performance of rendering opaque images. ([#1327][] by [@grebmeg])
### Known Limitations
- Filter effects currently support only single-primitive filters; filter graphs with multiple chained primitives are not yet supported.
- Multithreaded rendering is not supported for filter effects; filters are only applied in single-threaded mode.
See also the [vello_hybrid 0.0.5](../vello_hybrid/CHANGELOG.md#005---2026-01-08) and [vello_common 0.0.5](../vello_common/CHANGELOG.md#005---2026-01-08) releases.
## [0.0.4][] - 2025-10-17
This release has an [MSRV][] of 1.86.
No changelog was kept for this release.
See also the [vello_hybrid 0.0.4](../vello_hybrid/CHANGELOG.md#004---2025-10-17) and [vello_common 0.0.4](../vello_common/CHANGELOG.md#004---2025-10-17) releases.
## [0.0.3][] - 2025-10-04
This release has an [MSRV][] of 1.86.
No changelog was kept for this release.
See also the [vello_common 0.0.3](../vello_common/CHANGELOG.md#003---2025-10-04) release.
## [0.0.2][] - 2025-09-22
This release has an [MSRV][] of 1.85.
No changelog was kept for this release.
See also the [vello_common 0.0.2](../vello_common/CHANGELOG.md#002---2025-09-22) release.
## [0.0.1][] - 2025-05-10
This release has an [MSRV][] of 1.85.
This is the initial release. No changelog was kept for this release.
See also the [vello_common 0.0.1](../vello_common/CHANGELOG.md#001---2025-05-10) release.
[@DJMcNab]: https://github.com/DJMcNab
[@grebmeg]: https://github.com/grebmeg
[@jrmoulton]: https://github.com/jrmoulton
[@LaurenzV]: https://github.com/LaurenzV
[@nicoburns]: https://github.com/nicoburns
[@oscargus]: https://github.com/oscargus
[@taj-p]: https://github.com/taj-p
[@tomcur]: https://github.com/tomcur
[@upsuper]: https://github.com/upsuper
[@waywardmonkeys]: https://github.com/waywardmonkeys
[#1159]: https://github.com/linebender/vello/pull/1159
[#1203]: https://github.com/linebender/vello/pull/1203
[#1237]: https://github.com/linebender/vello/pull/1237
[#1286]: https://github.com/linebender/vello/pull/1286
[#1294]: https://github.com/linebender/vello/pull/1294
[#1327]: https://github.com/linebender/vello/pull/1327
[#1335]: https://github.com/linebender/vello/pull/1335
[#1343]: https://github.com/linebender/vello/pull/1343
[#1349]: https://github.com/linebender/vello/pull/1349
[#1351]: https://github.com/linebender/vello/pull/1351
[#1353]: https://github.com/linebender/vello/pull/1353
[#1354]: https://github.com/linebender/vello/pull/1354
[#1416]: https://github.com/linebender/vello/pull/1416
[#1422]: https://github.com/linebender/vello/pull/1422
[#1437]: https://github.com/linebender/vello/pull/1437
[#1451]: https://github.com/linebender/vello/pull/1451
[#1460]: https://github.com/linebender/vello/pull/1460
[#1488]: https://github.com/linebender/vello/pull/1488
[#1529]: https://github.com/linebender/vello/pull/1529
[#1541]: https://github.com/linebender/vello/pull/1541
[#1562]: https://github.com/linebender/vello/pull/1562
[#1563]: https://github.com/linebender/vello/pull/1563
[#1576]: https://github.com/linebender/vello/pull/1576
[#1584]: https://github.com/linebender/vello/pull/1584
[#1589]: https://github.com/linebender/vello/pull/1589
[#1592]: https://github.com/linebender/vello/pull/1592
[#1594]: https://github.com/linebender/vello/pull/1594
[#1602]: https://github.com/linebender/vello/pull/1602
[#1611]: https://github.com/linebender/vello/pull/1611
[#1613]: https://github.com/linebender/vello/pull/1613
[#1616]: https://github.com/linebender/vello/pull/1616
[#1628]: https://github.com/linebender/vello/pull/1628
[Unreleased]: https://github.com/linebender/vello/compare/sparse-strips-v0.0.8...HEAD
[0.0.8]: https://github.com/linebender/vello/compare/sparse-strips-v0.0.7...sparse-strips-v0.0.8
[0.0.7]: https://github.com/linebender/vello/compare/sparse-strips-v0.0.6...sparse-strips-v0.0.7
[0.0.6]: https://github.com/linebender/vello/compare/sparse-strips-v0.0.5...sparse-strips-v0.0.6
[0.0.5]: https://github.com/linebender/vello/compare/sparse-stips-v0.0.4...sparse-strips-v0.0.5
[0.0.4]: https://github.com/linebender/vello/compare/sparse-stips-v0.0.3...sparse-strips-v0.0.4
[0.0.3]: https://github.com/linebender/vello/compare/sparse-stips-v0.0.2...sparse-strips-v0.0.3
[0.0.2]: https://github.com/linebender/vello/compare/sparse-strips-v0.0.1...sparse-stips-v0.0.2
[0.0.1]: https://github.com/linebender/vello/compare/ca6b1e4c7f5b0d95953c3b524f5d3952d5669c5a...sparse-strips-v0.0.1
[MSRV]: README.md#minimum-supported-rust-version-msrv
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