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LibWeb: Move some common SVG gradient functions into SVGGradientElement

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These functions will also be used by SVG radial gradients.
This commit is contained in:
MacDue 2023-05-02 23:05:47 +01:00 • committed by Andreas Kling
parent eda429111e
commit 2826bd2b45
3 changed files with 38 additions and 19 deletions
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29
Userland/Libraries/LibWeb/SVG/SVGGradientElement.cpp
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@ -49,6 +49,35 @@ Optional<Gfx::AffineTransform> SVGGradientElement::gradient_transform() const
return {};
}
// The gradient transform, appropriately scaled and combined with the paint transform.
Gfx::AffineTransform SVGGradientElement::gradient_paint_transform(SVGPaintContext const& paint_context) const
{
auto transform = gradient_transform().value_or(Gfx::AffineTransform {});
if (gradient_units() == GradientUnits::ObjectBoundingBox) {
// Adjust transform to take place in the coordinate system defined by the bounding box:
return Gfx::AffineTransform { paint_context.transform }
.translate(paint_context.path_bounding_box.location())
.scale(paint_context.path_bounding_box.width(), paint_context.path_bounding_box.height())
.multiply(transform);
}
return Gfx::AffineTransform { paint_context.transform }.multiply(transform);
}
void SVGGradientElement::add_color_stops(Gfx::SVGGradientPaintStyle& paint_style) const
{
for_each_color_stop([&](auto& stop) {
// https://svgwg.org/svg2-draft/pservers.html#StopNotes
// Gradient offset values less than 0 (or less than 0%) are rounded up to 0%.
// Gradient offset values greater than 1 (or greater than 100%) are rounded down to 100%.
float stop_offset = AK::clamp(stop.stop_offset().value(), 0.0f, 1.0f);
// FIXME: Each gradient offset value is required to be equal to or greater than the previous gradient
// stop's offset value. If a given gradient stop's offset value is not equal to or greater than all
// previous offset values, then the offset value is adjusted to be equal to the largest of all previous
// offset values.
paint_style.add_color_stop(stop_offset, stop.stop_color()).release_value_but_fixme_should_propagate_errors();
});
}
JS::GCPtr<SVGGradientElement const> SVGGradientElement::xlink_href() const
{
// FIXME: This entire function is an ad-hoc hack!