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LibWeb: Implement Path2D#addPath

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Required by Ruffle.
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Luke Wilde 2023-02-27 18:23:31 +00:00 • committed by Andreas Kling
parent 1f97adbee8
commit a964ebc255
3 changed files with 40 additions and 1 deletions
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35
Userland/Libraries/LibWeb/HTML/Path2D.cpp
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@ -1,11 +1,13 @@
/*
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2023, Luke Wilde <lukew@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Geometry/DOMMatrix.h>
#include <LibWeb/HTML/Path2D.h>
#include <LibWeb/SVG/AttributeParser.h>
#include <LibWeb/SVG/SVGPathElement.h>
@ -62,4 +64,37 @@ JS::ThrowCompletionOr<void> Path2D::initialize(JS::Realm& realm)
return {};
}
// https://html.spec.whatwg.org/multipage/canvas.html#dom-path2d-addpath
WebIDL::ExceptionOr<void> Path2D::add_path(JS::NonnullGCPtr<Path2D> path, Geometry::DOMMatrix2DInit& transform)
{
// The addPath(path, transform) method, when invoked on a Path2D object a, must run these steps:
// 1. If the Path2D object path has no subpaths, then return.
if (path->path().segments().is_empty())
return {};
// 2. Let matrix be the result of creating a DOMMatrix from the 2D dictionary transform.
auto matrix = TRY(Geometry::DOMMatrix::create_from_dom_matrix_2d_init(realm(), transform));
// 3. If one or more of matrix's m11 element, m12 element, m21 element, m22 element, m41 element, or m42 element are infinite or NaN, then return.
if (!isfinite(matrix->m11()) || !isfinite(matrix->m12()) || !isfinite(matrix->m21()) || !isfinite(matrix->m22()) || !isfinite(matrix->m41()) || !isfinite(matrix->m42()))
return {};
// 4. Create a copy of all the subpaths in path. Let this copy be known as c.
// 5. Transform all the coordinates and lines in c by the transform matrix matrix.
auto copy = path->path().copy_transformed(Gfx::AffineTransform { static_cast<float>(matrix->m11()), static_cast<float>(matrix->m12()), static_cast<float>(matrix->m21()), static_cast<float>(matrix->m22()), static_cast<float>(matrix->m41()), static_cast<float>(matrix->m42()) });
// 6. Let (x, y) be the last point in the last subpath of c.
auto xy = copy.segments().last().point();
// 7. Add all the subpaths in c to a.
// FIXME: Is this correct?
this->path().add_path(copy);
// 8. Create a new subpath in a with (x, y) as the only point in the subpath.
this->move_to(xy.x(), xy.y());
return {};
}
}