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Add mix-blend-mode plus-lighter and feComposite operator=lighter - #1142
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Both are the Porter-Duff plus operator: plus-lighter (Compositing and Blending Level 2) parses into BlendMode::PlusLighter and feComposite's lighter (SVG 2) into CompositeOperator::Lighter; resvg renders both with tiny_skia::BlendMode::Plus. plus-lighter used to parse as nothing and render normal, lighter fell through to over. Closes linebender#1039.
LaurenzV
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Adds the two
lighteroperators the browsers ship, for some conformance gaps I ran into while testing femtovg against WPT and a large corpus of SVGs on the public web:mix-blend-mode: plus-lighter(Compositing and Blending Level 2), parsed intousvg::BlendMode::PlusLighterand rendered withtiny_skia::BlendMode::Plus. It used to parse as nothing and rendernormal.feComposite operator="lighter"(SVG 2), parsed intofilter::CompositeOperator::Lighterand applied withPlus. It used to fall through toover. Closes Implementoperator="lighter"for thefeCompositeelement #1039.Both are the Porter-Duff plus operator, so no new blend math; the writer round-trips both, and the SVG 2 changelog and the crate changelog are updated.
Tests:
painting/mix-blend-mode/plus-lighterandfilters/feComposite/operator=lighter, references rendered with this branch. Checked against browsers at the suite's 300 px: thefeCompositereference is pixel-identical to Chromium 131 (Firefox does not implementlighteryet and rendersover); theplus-lighterreference is pixel-identical to Firefox and matches Chromium's blended colour, the two browsers differing only in how they raster the test's gradient.Note for the release:
BlendModeandCompositeOperatorare exhaustive public enums, so the new variants are a breaking change forusvgconsumers that match on them.