End-to-end rasterization behind the render feature (which now enables
obscura-render/paint):
- obscura-render: screenshot_png(dom, viewport) paints and encodes to PNG
via tiny-skia's encode_png (no extra dep).
- obscura-browser: Page::screenshot renders the live DOM at a viewport.
- CLI: obscura fetch --screenshot out.png writes the settled page to a PNG.
- CDP: Page.captureScreenshot returns the PNG base64-encoded, so
Puppeteer/Playwright page.screenshot() works. captureSnapshot still
errors (it is a DOM/layer snapshot, not an image).
Verified: both paths produce correct 1280x720 RGBA PNGs with elements
laid out and colored as the CSS specifies (block stacking, backgrounds,
white page). Default build unchanged; obstacle course 33/33.
Text, borders, and images are not yet painted; the box layout and
background colors are rendered.
Adds a paint feature to obscura-render (tiny-skia: pure Rust, CPU,
deterministic, no system deps). paint_dom lays out the DOM and fills
each element's border box with its parsed background-color over a white
page, in tree order so descendants paint over ancestors.
Style parsing now also extracts background-color (hex #rgb/#rgba/
later enhancements.
Walk a live DomTree, compute each element's style (tag UA defaults plus
inline style), build a taffy layout tree, and return border-box geometry
keyed by NodeId. Block/flex structure, explicit sizes, and the box model
are correct; text nodes do not yet contribute to size (inline/text
layout lands with the paint phase).
This completes the layout core: a real DOM now produces real geometry,
pure Rust, behind the opt-in render crate. JS exposure is next.
Parse inline style attributes into the layout-relevant subset of
LayoutStyle: display, width/height, margin, padding, and border width,
including box shorthands (1-4 values) and per-side longhands. !important
is stripped; auto and percentages leave the size unset for phase 1.
Layered on a small built-in UA default sheet. A compact hand-rolled
tokenizer handles inline attributes without a cssparser dependency; a
real cascade can harden it later.
New optional crate obscura-render, the scoped render layer for Obscura.
Phase 1 adds the layout core: a LayoutNode tree plus a viewport is laid
out with taffy (pure Rust) and border-box geometry is returned per node,
mirroring the input tree.
The crate is a workspace member but not yet a dependency of any other
crate, so the default scraping build is unchanged. Geometry-from-DOM,
JS integration, text, paint, and screenshot capture land in later
phases.
Unit tests cover block stacking, flex row layout, and padding.
SGavrl