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M9.4: document layer styles in the render pipeline 

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Brandon Thomas 2026-10-02 00:00:21 -04:00
parent 8f966a99f7
commit ae28e4e3b5
1 changed files with 9 additions and 1 deletions
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docs/architecture.md
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@ -61,7 +61,7 @@ text animators and shape contents are groups in the same tree.
`Renderer::comp_frame(comp, t)` walks the layers bottom to top. For each visible layer it renders `Renderer::comp_frame(comp, t)` walks the layers bottom to top. For each visible layer it renders
the **source** (solid, footage frame, text, shape contents, or a nested comp), applies **masks**, the **source** (solid, footage frame, text, shape contents, or a nested comp), applies **masks**,
then **effects** in order, then the **transform** into comp space (with motion blur sub-samples then **effects** in order, then **layer styles**, then the **transform** into comp space (with motion blur sub-samples
when enabled), the **track matte**, and finally **blends** into the accumulator. Adjustment layers when enabled), the **track matte**, and finally **blends** into the accumulator. Adjustment layers
apply their effects to the accumulator. Runs of 3D layers are composited per pixel through the apply their effects to the accumulator. Runs of 3D layers are composited per pixel through the
active camera, with lights, shadows and depth of field. active camera, with lights, shadows and depth of field.
@ -71,6 +71,14 @@ its evaluated inputs, excluding the transform. Static and transform-only layers
editing one layer re-renders only that layer. Effects that read the clock directly are declared in editing one layer re-renders only that layer. Effects that read the clock directly are declared in
`effects::TIME_DEPENDENT`, and a test checks every registered effect against that list. `effects::TIME_DEPENDENT`, and a test checks every registered effect against that list.
**Layer styles** (Layer ▸ Layer Styles; `crates/render/src/styles.rs`) render in layer space and
may grow the layer's bounds. Drop Shadow and Outer Glow become separate passes composited below the
layer with their own blend modes; the interior styles, Stroke and Bevel and Emboss are baked into
the layer body. Layer opacity fades the whole stack; Knockout and the R/G/B channel switches apply
at composite time. Styled pixels are cached separately from the layer content, so editing a style
reuses the cached source/masks/effects. Global Light is one setting per comp, mirrored into every
layer's Blending Options and kept in step after each edit.
Half, Third and Quarter resolution render proportionally fewer pixels end to end. Half, Third and Quarter resolution render proportionally fewer pixels end to end.
## 5. Expressions ## 5. Expressions