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LibWeb: Do not crash when Radial Gradient height is 0

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This commit is contained in:
Pavel Shliak 2024-11-18 23:14:45 +04:00 committed by Alexander Kalenik
parent ed409eacf5
commit 6033349574
Notes: github-actions[bot] 2024-11-19 21:32:49 +00:00 
Author: https://github.com/shlyakpavel
Commit: https://github.com/LadybirdBrowser/ladybird/commit/6033349574d
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2429
Reviewed-by: https://github.com/kalenikaliaksandr
3 changed files with 21 additions and 1 deletions
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17
Libraries/LibWeb/CSS/StyleValues/RadialGradientStyleValue.cpp
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@ -113,7 +113,22 @@ CSSPixelSize RadialGradientStyleValue::resolve_size(Layout::Node const& node, CS
auto distance = corner_distance(corner);
if (m_properties.ending_shape == EndingShape::Ellipse) {
auto shape = get_shape();
auto aspect_ratio = shape.width() / shape.height();
CSSPixels height = shape.height();
CSSPixels width = shape.width();
// Prevent division by zero
// https://w3c.github.io/csswg-drafts/css-images/#degenerate-radials
if (height == 0) {
// Render as if the ending shape was an ellipse whose width was an arbitrary very large number and whose height
// was an arbitrary very small number greater than zero. This will make the gradient look like a solid-color image equal
// to the color of the last color-stop, or equal to the average color of the gradient if it’s repeating.
constexpr auto arbitrary_small_number = CSSPixels::smallest_positive_value();
constexpr auto arbitrary_large_number = CSSPixels::max();
return CSSPixelSize { arbitrary_large_number, arbitrary_small_number };
}
auto aspect_ratio = width / height;
auto p = corner - center;
auto radius_a = sqrt(p.y() * p.y() * aspect_ratio * aspect_ratio + p.x() * p.x());
auto radius_b = radius_a / aspect_ratio;

2
Tests/LibWeb/Ref/expected/empty-radial-gradient-crash.html Normal file
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@ -0,0 +1,2 @@
<!doctype html>
<div style="background-color: red;">Should not crash</div>

3
Tests/LibWeb/Ref/input/empty-radial-gradient-crash.html Normal file
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@ -0,0 +1,3 @@
<!doctype html>
<link rel="match" href="../expected/empty-radial-gradient-crash.html" />
<div style="background-image: radial-gradient(ellipse closest-corner at 0px 0px, white, red);">Should not crash</div>