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LibWeb: Apply the paint transformation in SVGGradientElement

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In commit 1b82cb43c2 I accidentally
removed the paint transformation altogether. The result was that
zoomed-in SVGs, or SVG elements with a transformation applied could have
their gradient coordinates misplaced significantly.

This was also exposed in the `svg-text-effects` test by way of a slight
visual difference. Add a new test that very clearly exposes the fixed
issue by rotating the gradient coordinates by 45 degrees.
This commit is contained in:
Jelle Raaijmakers 2024-11-15 14:41:15 +01:00 committed by Andreas Kling
parent e21b5cab32
commit e5d71a6c82
Notes: github-actions[bot] 2024-11-15 22:37:58 +00:00 
Author: https://github.com/gmta
Commit: https://github.com/LadybirdBrowser/ladybird/commit/e5d71a6c827
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2357
7 changed files with 25 additions and 1 deletions
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1
Libraries/LibWeb/Painting/SVGPathPaintable.cpp
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@ -106,6 +106,7 @@ void SVGPathPaintable::paint(PaintContext& context, PaintPhase phase) const
SVG::SVGPaintContext paint_context {
.viewport = svg_viewport,
.path_bounding_box = computed_path()->bounding_box(),
.paint_transform = paint_transform,
};
auto fill_opacity = graphics_element.fill_opacity().value_or(1);

2
Libraries/LibWeb/SVG/SVGGradientElement.cpp
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@ -84,7 +84,7 @@ Optional<Gfx::AffineTransform> SVGGradientElement::gradient_transform_impl(HashT
// The gradient transform, appropriately scaled and combined with the paint transform.
Gfx::AffineTransform SVGGradientElement::gradient_paint_transform(SVGPaintContext const& paint_context) const
{
Gfx::AffineTransform gradient_paint_transform;
Gfx::AffineTransform gradient_paint_transform = paint_context.paint_transform;
auto const& bounding_box = paint_context.path_bounding_box;
if (gradient_units() == SVGUnits::ObjectBoundingBox) {

1
Libraries/LibWeb/SVG/SVGGradientElement.h
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@ -19,6 +19,7 @@ namespace Web::SVG {
struct SVGPaintContext {
Gfx::FloatRect viewport;
Gfx::FloatRect path_bounding_box;
Gfx::AffineTransform paint_transform;
};
inline Painting::SVGGradientPaintStyle::SpreadMethod to_painting_spread_method(SpreadMethod spread_method)

9
Tests/LibWeb/Screenshot/expected/svg-gradient-paint-transformation-ref.html Normal file
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@ -0,0 +1,9 @@
<style>
* {
margin: 0;
}
body {
background-color: white;
}
</style>
<img src="../images/svg-gradient-paint-transformation-ref.png">

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Tests/LibWeb/Screenshot/images/svg-gradient-paint-transformation-ref.png Normal file
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Tests/LibWeb/Screenshot/images/svg-text-effects-ref.png
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13
Tests/LibWeb/Screenshot/input/svg-gradient-paint-transformation.html Normal file
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@ -0,0 +1,13 @@
<link rel="match" href="../expected/svg-gradient-paint-transformation-ref.html" />
<svg height="150" width="150" xmlns="http://www.w3.org/2000/svg">
<style>
.hi {
font: bold 70px sans-serif;
}
</style>
<linearGradient id="gradient">
<stop offset="0%" stop-color="rgba(255, 0, 0, 1)"/>
<stop offset="100%" stop-color="rgba(0, 255, 0, 1)"/>
</linearGradient>
<text x="50" y="50" class="hi" fill="url(#gradient)" transform="rotate(45 50 50)">HI</text>
</svg>