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LibWeb: Fix rendering of counter-clockwise arcs

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Gingeh 2024-09-07 10:50:27 +10:00 committed by Andreas Kling
parent 40db0848d5
commit 1b8c0cd368
Notes: github-actions[bot] 2024-09-07 09:38:48 +00:00 
Author: https://github.com/Gingeh
Commit: https://github.com/LadybirdBrowser/ladybird/commit/1b8c0cd368d
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/1308
1 changed files with 14 additions and 2 deletions
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16
Userland/Libraries/LibWeb/HTML/Canvas/CanvasPath.cpp
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@ -107,12 +107,18 @@ WebIDL::ExceptionOr<void> CanvasPath::ellipse(float x, float y, float radius_x,
if (radius_y < 0)
return WebIDL::IndexSizeError::create(m_self->realm(), MUST(String::formatted("The minor-axis radius provided ({}) is negative.", radius_y)));
// "If counterclockwise is false and endAngle − startAngle is greater than or equal to 2π,
// or, if counterclockwise is true and startAngle − endAngle is greater than or equal to 2π,
// then the arc is the whole circumference of this ellipse"
// Also draw the full ellipse if making a non-zero whole number of turns.
if (constexpr float tau = M_PI * 2; (!counter_clockwise && (end_angle - start_angle) >= tau)
|| (counter_clockwise && (start_angle - end_angle) >= tau)) {
|| (counter_clockwise && (start_angle - end_angle) >= tau)
|| (start_angle != end_angle && fmodf(start_angle - end_angle, tau) == 0)) {
start_angle = 0;
// FIXME: elliptical_arc_to() incorrectly handles the case where the start/end points are very close.
// So we slightly fudge the numbers here to correct for that.
end_angle = tau * 0.9999f;
counter_clockwise = false;
} else {
start_angle = fmodf(start_angle, tau);
end_angle = fmodf(end_angle, tau);
@ -154,7 +160,13 @@ WebIDL::ExceptionOr<void> CanvasPath::ellipse(float x, float y, float radius_x,
auto start_point = resolve_point_with_angle(start_angle);
auto end_point = resolve_point_with_angle(end_angle);
auto delta_theta = end_angle - start_angle;
float delta_theta;
if (counter_clockwise) {
delta_theta = start_angle - end_angle;
} else {
delta_theta = end_angle - start_angle;
}
if (delta_theta < 0)
delta_theta += AK::Pi<float> * 2;